RT8203
High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook Computers
General Description
The RT8203 dual step-down, Switch Mode Power Supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The RT8203 include two pulsewidth modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the main SMPS outputs. The RT8203 include on-board power-up sequencing, a power good (PGOOD) output, internal softstart, and soft-shutdown output discharge that prevents negative voltages on shutdown. Richtek's proprietary MachPWMTM “instant-on” response, constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include diode-emulation, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications. The RT8203 provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respectively. The RT8203 is available in SSOP-28 package.
Ordering Information
RT8203
Package Type
A : SSOP-28
Lead Plating System P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
`RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
Features
zNo Current Sense Resistor Needed
z1.5% Output Voltage Accuracy
z3.3V and 5V 100mA Bootstrapped Linear Regulators
zInternal Soft-Start and Soft-Shutdown Output Discharge
zMach-PWM with 100ns Load Step Response
z3.3V and 5V Fixed or Adjustable Outputs
z7V to 24V Input Voltage Range
zUltrasonic Mode Operation 25kHz (min.)
zPower Good (PGOOD) Signal
zOver Voltage Protection
zUnder Voltage Protection
zOver Temperature Protection
zRoHS Compliant and 100% Lead (Pb)-Free
Applications
zNotebook and Subnotebook Computers
zPDAs and Mobile Communication Devices
z3- and 4-Cell Li+ Battery-Powered Devices
Pin Configurations
(TOP VIEW)
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BOOT3 |
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NC |
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28 |
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PGOOD |
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PHASE3 |
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ON3 |
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UGATE3 |
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ON5 |
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LDO3 |
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ILIM3 |
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LGATE3 |
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EN |
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GND |
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FB3 |
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VOUT3 |
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VREF |
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VOUT5 |
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FB5 |
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VIN |
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PRO |
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LGATE5 |
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ILIM5 |
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LDO5 |
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SKIP |
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VCC |
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TON |
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UGATE5 |
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BOOT5 |
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PHASE5 |
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SSOP-28
DS8203-05 April 2011 |
www.richtek.com |
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1 |
RT8203
Typical Application Circuit
5V |
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ALWAYS ON |
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C1 |
+ |
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18 |
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VIN |
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7V to 24V |
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4.7µF |
C2 |
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R1 |
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R2 |
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LDO5 |
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1µF |
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3.9 |
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17 |
VCC |
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ON3 3 |
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VREF |
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5 |
ILIM3 |
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ON5 4 |
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VCC |
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VCC |
C3 |
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11 |
ILIM5 |
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LDO3 25 |
R6 |
C4 |
3.3V ALWAYS ON |
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1µF |
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VIN |
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PRO |
10 |
1M |
4.7µF |
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RT8203 |
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C5 |
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BAT254 |
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D2 |
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0.1µF |
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ON |
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D1 |
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EN 6 |
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BAT254 |
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R3 |
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R4 |
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OFF |
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2.2 |
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BOOT5 |
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BOOT3 |
28 2.2 |
C9 |
C7 |
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C6 |
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C8 |
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0.1µF |
10µF |
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10µF |
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0.1µF |
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UGATE3 26 |
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Q2 |
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Q1 |
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16 |
UGATE5 |
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VOUT5 |
L1 |
AO4702 |
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AO4702 |
VOUT3 |
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15 |
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PHASE3 27 |
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L2 |
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5V |
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PHASE5 |
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3.3V |
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C10 |
D3 |
BSC119N03 |
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LGATE3 24 |
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D4 |
C11 |
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Q3 |
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LGATE5 |
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Q4 |
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BSC119N03 |
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SEE |
TON |
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VOUT3 22 |
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TABLE |
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VOUT5 |
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SKIP 12 |
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VCC |
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VREF |
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C12 |
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FB3 |
7 |
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FB5 |
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NC 1 |
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R5 |
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0.22µF |
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23 |
GND |
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PGOOD 2 |
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100k |
Power-Good |
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INDICATOR |
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Frequency-dependent Components
VOUT5 |
VOUT3 |
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TON = VCC |
TON = GND |
TON = VCC |
TON = GND |
f = 200kHz |
f = 400kHz |
f = 300kHz |
f = 500kHz |
L1 = 7.6μH |
L1 = 5.6μH |
L2 = 4.7μH |
L2 = 3μH |
C10 = 330μF |
C10 = 150μF |
C11 = 470μF |
C11 = 220μF |
Figure 1. Fixed Voltage Regulator
www.richtek.com |
DS8203-05 April 2011 |
2
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RT8203 |
5V |
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ALWAYS ON |
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C1 |
+ |
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18 |
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VIN |
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7V to 24V |
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4.7µF |
C2 |
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R1 |
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R2 |
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LDO5 |
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1µF |
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47 |
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3.9 |
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17 |
VCC |
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ON3 3 |
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VREF |
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5 |
ILIM3 |
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ON5 4 |
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VCC |
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VCC |
C3 |
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11 |
ILIM5 |
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LDO3 25 |
R6 |
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C4 |
3.3V ALWAYS ON |
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1µF |
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20 |
VIN |
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PRO |
10 |
1M |
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4.7µF |
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RT8203 |
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C5 |
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BAT254 |
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D2 |
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0.1µF |
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ON |
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D1 |
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EN 6 |
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BAT254 |
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R3 |
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R4 |
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OFF |
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2.2 |
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BOOT5 |
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BOOT3 |
28 2.2 |
C9 |
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C7 |
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C6 |
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C8 |
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0.1µF |
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10µF |
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10µF |
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0.1µF |
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UGATE3 26 |
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Q2 |
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Q1 |
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16 |
UGATE5 |
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VOUT5 |
L1 |
AO4702 |
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AO4702 |
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VOUT3 |
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PHASE3 27 |
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L2 |
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5V |
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PHASE5 |
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3.3V |
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C10 |
D3 |
BSC119N03 |
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LGATE3 24 |
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D4 |
C11 |
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Q3 |
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LGATE5 |
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Q4 |
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BSC119N03 |
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SEE |
TON |
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VOUT3 22 |
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TABLE |
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VOUT5 |
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R9 |
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R7 |
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FB3 7 |
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6.5k |
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C13 |
15k |
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FB5 |
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C14 |
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SKIP 12 |
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VCC |
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R10 |
0.1µF |
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0.1µF |
R8 |
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VREF |
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NC 1 |
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10k |
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10k |
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C12 |
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R5 |
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0.22µF |
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23 |
GND |
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PGOOD 2 |
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100k |
Power-Good |
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INDICATOR |
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Frequency-dependent Components
VOUT5 |
VOUT3 |
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TON = VCC |
TON = GND |
TON = VCC |
TON = GND |
f = 200kHz |
f = 400kHz |
f = 300kHz |
f = 500kHz |
L1 = 7.6μH |
L1 = 5.6μH |
L2 = 4.7μH |
L2 = 3μH |
C10 = 330μF |
C10 = 150μF |
C11 = 470μF |
C11 = 220μF |
Figure 2. Adjustable Voltage Regulator
DS8203-05 April 2011 |
www.richtek.com |
3
RT8203
Functional Pin Description
Pin No. |
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Pin Name |
Pin Function |
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1 |
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NC |
Connect to GND. |
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2 |
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PGOOD |
Power Good Open Drain Output. PGOOD is pulled low if either output is disable or is |
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more than 8.75% below its normal value. |
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VOUT3 Enable Input. The 3.3V SMPS is enable if ON3 is greater than the on level |
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ON3 |
and disable if ON3 is less than the off level. If ON3 is connected to VREF, the 3.3V |
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SMPS starts after the 5V SMPS reached regulation(delay start). Force ON3 below the |
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clear fault level to reset the fault latched. |
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VOUT5 Enable Input. The 5V SMPS is enable if ON5 is greater than the on level and |
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ON5 |
disable if ON5 is less than the off level. If ON5 is connected to VREF, the 5V SMPS |
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starts after the 3.3V SMPS reached regulation(delay start). Force ON5 below the clear |
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fault level to reset the fault latched. |
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VOUT3 Current Limit Adjustment. The GND-PHASE3 current limit threshold defaults |
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ILIM3 |
to 100mV if ILIM3 is tied to VCC. In adjustable mode, the current limit threshold is 1/10 |
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the voltage seen at ILIM3 over 0.5V to 3V range. The logic threshold for switch over to |
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100mV default value is approximately VCC − 1V. |
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Enable Control Input. The device enters its 15μA supply current shutdown mode if EN |
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is less than the EN input falling edge trip level and does not restart until EN is greater |
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EN |
than the EN input rising edge trip level. Connect EN to VIN for automatically startup. |
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EN can be connected to VIN through a resistive voltage divider to implement a |
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programmable undervoltage lockout. |
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7 |
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FB3 |
VOUT3 Feedback Input. Connect FB3 to GND for fixed 3.3V operation. Connect FB3 |
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to a resistive voltage divider from VOUT3 to GND to adjust the output from 2V to 5.5V. |
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2V Reference Output. Bypass to GND with a 0.22μF(MIN) capacitor. VREF can source |
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8 |
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VREF |
up to 100μA for external loads. Loading VREF degrades FBx and VOUTx accuracy |
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according to the VREF load regulation error. |
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9 |
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FB5 |
VOUT5 Feedback Input. Connect FB5 to GND for fixed 5V operation. Connect FB5 to |
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a resistive voltage divider from VOUT5 to GND to adjust the output from 2V to 5.5V. |
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Over Voltage and Under Voltage Fault Protection Enable/Disable. Connect |
PRO |
to |
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PRO |
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10 |
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VCC to disable Over Voltage and Under Voltage protection. Connect PRO to GND to |
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enable Over Voltage and Under Voltage protection. |
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VOUT5 Current Limit Adjustment. The GND − PHASE5 current limit threshold defaults |
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11 |
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ILIM5 |
to 100mV if ILIM5 is tied to VCC. In adjustable mode, the current limit threshold is 1/10 |
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the voltage seen at ILIM5 over 0.5V to 3V range. The logic threshold for switch over to |
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100mV default value is approximately VCC − 1V. |
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Operation Mode Input Control. Connect SKIP to GND for diode-emulation mode |
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12 |
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SKIP |
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(DEM) or to VCC for CCM mode(fixed frequency). Connect to VREF or floating for |
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ultrasonic mode. |
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13 |
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TON |
Frequency Select Input. Connect to VCC for 200kHz/300kHz operation and to GND |
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for 400kHz/500kHz operation (VOUT5/VOUT3 switching frequency respectively). |
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14 |
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BOOT5 |
Boost Capacitor Connection for 5V SMPS. Connect an external ceramic capacitor to |
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PHASE5 and an external diode to LDO5. |
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To be continued |
www.richtek.com |
DS8203-05 April 2011 |
4 |
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RT8203
Pin No. |
Pin Name |
Pin Function |
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15 |
PHASE5 |
Inductor Connection for 5V SMPS. PHASE5 is the internal lower supply rail for the |
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UGATE5 high side gate driver, and the current sense input for the 5V SMPS. |
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16 |
UGATE5 |
High Side N-MOSFET Floating Gate-Driver Output for VOUT5. Swings between |
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PHASE5 and BOOT5. |
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17 |
VCC |
Analog Supply Voltage Input for the internal analog integrated circuit. Bypass to GND |
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with a 1μF ceramic capacitor. |
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5V Linear Regulator Output. LDO5 is the gate driver supply for the external |
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MOSFETs. LDO5 can provide a total of 100mA, including the MOSFET gate-driver |
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18 |
LDO5 |
requirements and external loads. If VOUT5 is greater than the LDO5 switchover |
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threshold, the LDO5 regulator shuts down and LDO5 pin connects to VOUT5 through |
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a 1.4Ω switch. Bypass a 4.7μF ceramic capacitor to GND. |
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19 |
LGATE5 |
Low side N-MOSFET Gate-Drive Output for VOUT5. Swings between GND and |
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LDO5. |
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20 |
VIN |
Power-Supply Input. VIN powers the LDO5/LDO3 linear regulators and is also used |
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for PWM control circuits. Connect VIN to the battery input or the AC adapter output. |
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VOUT5 Sense Input. Connect to the 5V output. VOUT5 is an input to the PWM control |
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21 |
VOUT5 |
circuit. It also serves as the 5V feedback input in fixed-voltage mode. If VOUT5 is |
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greater than the LDO5 switchover threshold, the LDO5 shuts down and LDO5 |
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connects to VOUT5 through 1.4Ω switch. |
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VOUT3 Sense Input. Connect to the 3.3V output. VOUT3 is an input to the PWM |
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22 |
VOUT3 |
control circuit. It also serves as the 3.3V feedback input in fixed voltage mode. If |
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VOUT3 is greater than the LDO3 switchover threshold, the LDO3 shuts down and |
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LDO3 connects to VOUT3 through 1.5Ω switch. |
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23 |
GND |
Analog and Power Ground. |
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24 |
LGATE3 |
Low side N-MOSFET Gate-Drive Output for VOUT3. Swings between GND and |
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LDO5. |
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3.3V Linear Regulator Output. LDO3 can provide a total of 100mA to external loads. If |
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25 |
LDO3 |
VOUT3 is greater than the LDO3 switchover threshold, the LDO3 regulator shuts |
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down and LDO3 pin connects to VOUT3 through a 1.5Ω switch. Bypass a 4.7μF |
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ceramic capacitor to GND. |
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26 |
UGATE3 |
High Side N-MOSFET Floating Gate-Driver Output for VOUT3. Swings between |
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PHASE3 and BOOT3. |
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27 |
PHASE3 |
Inductor Connection for 3.3V SMPS. PHASE3 is the internal lower supply rail for the |
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UGATE3 high side gate driver, and the current sense input for the 3.3V SMPS. |
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28 |
BOOT3 |
Boost Capacitor Connection for 3.3V SMPS. Connect an external ceramic capacitor to |
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PHASE3 and an external diode to LDO5. |
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DS8203-05 April 2011 |
www.richtek.com |
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5 |
RT8203
Function Block Diagram
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VIN |
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PGOOD |
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GND |
BOOT3 |
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U3 |
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U5 |
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BOOT5 |
UGATE3 |
Driver |
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Driver |
UGATE5 |
PHASE3 |
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PHASE5 |
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L3 |
VOUT3 |
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VOUT5 |
L5 |
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LGATE3 |
Driver |
PWM |
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PWM |
Driver |
LGATE5 |
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Controller |
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Controller |
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ILIM3 |
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ILIM5 |
FB3 |
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FB5 |
VOUT3 |
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VOUT5 |
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+ |
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4.65V |
+ |
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2.93V |
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- |
EN5 |
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EN3 |
- |
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LDO |
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LDO5 |
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(5V) |
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LDO3 |
LDO |
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LDO5 |
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(3V) |
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VCC |
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ON3 |
Power Sequence |
Thermal |
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2V |
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ON5 |
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VREF |
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EN |
Logic |
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Shutdown |
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Reference |
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PRO |
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VIN |
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Ton |
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Ux |
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1-SHOT |
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VOUTx |
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R |
TRIG |
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Ton |
QN |
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On-time |
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QN |
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Compute |
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TRIG |
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Min. Toff
1-SHOT
VREF |
+ |
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- |
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GM |
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+ |
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- |
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Comp |
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25Khz |
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Detector |
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SS |
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Lx |
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(internal) |
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FBx |
+ |
OV |
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- |
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PRO |
1.1xVREF |
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Zero |
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SKIP |
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- |
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S1 |
Detector |
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- |
UV |
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S2 Latch |
Q |
+ |
PHASEx |
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+ |
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0.7xVREF |
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Current |
+ |
ILIMx |
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- |
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Limit - |
- |
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+ |
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+ |
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PGOOD |
0.9xVREF |
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PWM Controller |
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www.richtek.com |
DS8203-05 April 2011 |
6
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RT8203 |
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Absolute Maximum Ratings (Note 1) |
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z Input Voltage, VIN, EN to GND ------------------------------------------------------------------------------ |
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−0.3V to 25V |
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z BOOTx to GND ------------------------------------------------------------------------------------------------- |
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−0.3V to 30V |
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z PHASEx to BOOTx -------------------------------------------------------------------------------------------- |
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−6V to 0.3V |
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z PHASEx to GND ------------------------------------------------------------------------------------------------ |
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−1V to 25V |
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z VCC, LDOx, VOUTx, ONx, VREF, FBx, |
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−0.3V to 6V |
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SKIP, |
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PRO, |
---------------------------PGOOD to GND |
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z UGATEx to PHASEx ------------------------------------------------------------------------------------------ |
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−0.3V to (VBOOTx + 0.3V) |
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z ILIMx to GND ---------------------------------------------------------------------------------------------------- |
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−0.3V to (VCC + 0.3V) |
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z LGATEx to GND ------------------------------------------------------------------------------------------------ |
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−0.3V to (VLDO5 + 0.3V) |
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z TON toGND ------------------------------------------------------------------------------------------------------ |
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−0.3V to 6V |
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z LDOx, VREF Short Circuit to GND ------------------------------------------------------------------------- |
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Momentary |
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z LDOx Circuit (Internal Regulator) Continuous |
----------------------------------------------------------- |
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100mA |
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z LDOx Circuit (Switchover to VOUTx) Continuous ------------------------------------------------------ |
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200mA |
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z Power Dissipation, PD @ TA = 25°C |
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SSOP-28 -------------------------------------------------------------------------------------------------------- |
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1.053W |
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z Package Thermal Resistance |
(Note 2) |
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SSOP-28, θJA ---------------------------------------------------------------------------------------------------- |
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95°C/W |
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z Junction Temperature ------------------------------------------------------------------------------------------ |
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150°C |
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z Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------- |
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260°C |
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z Storage Temperature Range --------------------------------------------------------------------------------- |
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–65°C to 150°C |
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z ESD Susceptibility (Note 3) |
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HBM (Human Body Mode) ----------------------------------------------------------------------------------- |
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2kV |
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MM (Machine Mode) ------------------------------------------------------------------------------------------- |
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200V |
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Recommended Operating Conditions (Note 4) |
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z Input Voltage, VIN ----------------------------------------------------------------------------------------------- |
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7V to 24V |
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z Control Voltage, VCC ------------------------------------------------------------------------------------------- |
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5V ± 5% |
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z Junction Temperature Range --------------------------------------------------------------------------------- |
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–10°C to 125°C |
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z Ambient Temperature Range --------------------------------------------------------------------------------- |
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–10°C to 85°C |
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Electrical Characteristics |
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(VIN = 12V, No load on LDOx, VOUTx and VREF, ONx = VCC, VEN = 5V, TA = 25°C, unless Otherwise specification) |
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Parameter |
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Symbol |
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Test Conditions |
Min |
Typ |
Max |
Unit |
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Main SMPS Controllers |
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Input Voltage Range |
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VIN |
LDO5 in regulation |
7 |
-- |
24 |
V |
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VOUT3 Output Voltage in Fixed |
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VOUT3 |
VIN = 7V to 24V, FB3 = GND, |
3.285 |
3.330 |
3.375 |
V |
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Mode |
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VSKIP = 5V |
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VOUT5 Output Voltage in Fixed |
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VOUT5 |
VIN = 8V to 24V, FB5 = GND, |
4.975 |
5.059 |
5.125 |
V |
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Mode |
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V |
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= 5V |
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SKIP |
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Output Voltage in Adjustable Mode |
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VIN = 7V to 24V, either SMPS |
1.975 |
2.00 |
2.025 |
V |
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Output Voltage Adjust Range |
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Either SMPS |
2 |
-- |
5.5 |
V |
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FBx Adjustable-Mode Threshold |
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Dual-Mode comparator |
0.12 |
-- |
0.22 |
V |
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Voltage |
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To be continued |
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DS8203-05 April 2011 |
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www.richtek.com |
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7 |
RT8203
Parameter |
Symbol |
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Test Conditions |
Min |
Typ |
Max |
Unit |
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Either SMPS, V |
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= 5V, 0 to 5A |
-- |
−0.1 |
-- |
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SKIP |
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DC Load Regulation |
VLOAD |
Either SMPS, V |
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= GND, 0 to 5A |
-- |
−1.5 |
-- |
% |
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SKIP |
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Either SMPS, V |
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= 2V, 0 to 5A |
-- |
−1.7 |
-- |
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SKIP |
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Line Regulation |
VLINE |
Either SMPS, 7V< VIN <24V |
--- |
0.005 |
-- |
%/V |
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Current-Limit Threshold |
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ILIMx = VCC, GND to PHASEx |
90 |
100 |
110 |
mV |
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(Positive, Default) |
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Current-Limit Threshold |
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VILIMx = 0.5V, GND to PHASEx |
40 |
50 |
60 |
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VILIMx = 1V, GND to PHASEx |
90 |
100 |
110 |
mV |
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(Positive, Adjustable) |
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VILIMx = 2V, GND to PHASEx |
185 |
200 |
215 |
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Zero-Current Threshold |
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= GND, ILIMx = VCC, GND − PHASEx |
-- |
3 |
-- |
mV |
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SKIP |
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Soft-Start Ramp Time |
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Zero to full limit |
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-- |
1.5 |
--- |
ms |
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VTON = 5V, |
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5V SMPS |
-- |
200 |
-- |
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V |
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= VCC |
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3.3V SMPS |
-- |
300 |
-- |
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SKIP |
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Operating Frequency |
fOSC |
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kHz |
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VTON = GND |
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5V SMPS |
-- |
400 |
-- |
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V |
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= VCC |
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SKIP |
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3.3V SMPS |
-- |
500 |
-- |
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= VREF |
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25 |
-- |
-- |
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SKIP |
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VTON = 5V |
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VOUT5 = 5.05V |
1.854 |
2.060 |
2.265 |
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On-Time Pulse Width |
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VOUT3 = 3.33V |
0.821 |
0.912 |
1.003 |
μs |
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V |
= GND |
VOUT5 = 5.05V |
0.876 |
1.030 |
1.184 |
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TON |
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VOUT3 = 3.33V |
0.467 |
0.546 |
0.625 |
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Minimum Off-time |
tOFF |
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300 |
400 |
500 |
ns |
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VTON = 5V |
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VOUT5 = 5.05V |
-- |
92 |
-- |
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Maximum Duty Cycle |
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VOUT3 = 3.33V |
-- |
88 |
-- |
% |
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VTON = GND |
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VOUT5 = 5.05V |
-- |
84 |
-- |
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VOUT3 = 3.33V |
-- |
80 |
-- |
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Internal Regulator And Reference Voltage |
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LDO5 Output Voltage |
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ONx = GND, 7V < VIN < 24V, |
4.90 |
5.0 |
5.10 |
V |
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0 < ILDO5 < 100mA |
(Note 5) |
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LDO5 Short-Circuit Current |
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LDO5 = GND |
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-- |
350 |
-- |
mA |
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VCC Under-Voltage |
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Falling edge of VCC, |
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3.95 |
4.25 |
4.55 |
V |
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Lockout Fault Threshold |
|
hysteresis = 1% |
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LDO5 Bootstrap Switch |
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Falling edge of VOUT5, rising edge at |
4.52 |
4.65 |
4.78 |
V |
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Threshold |
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VOUT5 regulation point |
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LDO5 Bootstrap Switch |
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LDO5 to VOUT5, VOUT5 = 5V |
-- |
1.4 |
3.2 |
Ω |
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Resistance |
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LDO3 Output Voltage |
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ONx = GND, 7V < VIN < 24V, |
3.28 |
3.35 |
3.42 |
V |
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0 < ILDO3 < 100mA |
(Note 5) |
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LDO3 Short-Circuit Current |
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LDO3 = GND |
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-- |
175 |
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mA |
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LDO3 Bootstrap Switch |
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Falling edge of VOUT3, rising edge at |
2.82 |
2.93 |
3.04 |
V |
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Threshold |
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VOUT3 regulation point |
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To be continued |
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www.richtek.com |
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DS8203-05 April 2011 |
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8 |
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