RT8223A/B
High Efficiency, Main Power Supply Controller for Notebook Computers
General Description
The RT8223A/B dual step-down, switch-mode powersupply controller generates logic-supply voltages in battery-powered systems. The RT8223A/B includes two pulse-width modulation (PWM) controllers fixed at 5V/ 3.3V or adjustable from 2V to 5.5V. This device also features 2 linear regulators providing fixed 5V and 3.3V outputs. The linear regulator each provides up to 70mA output current with automatic linear-regulator bootstrapping to the PWM outputs. The RT8223A/B includes on-board power-up sequencing, the power good output, internal softstart, and internal soft-discharge output that prevents negative voltages on shutdown.
A constant on-time PWM control scheme operates without sense resistor 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 diodeemulation mode (DEM), which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive application
Ordering Information
RT8223 
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Pin Function
A : Default
B : With ENC
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
zWide Input Voltage Range 6V to 25V
zDual Fixed 5V/3.3V Outputs or Adjustable from 2V to 5.5V, 1.5% Accuracy
zFixed 3.3V and 5V LDO Output : 70mA
z2V Reference Voltage ±1% : 50μA
zConstant ON-Time Control with 100ns Load Step Response
zFrequency Selectable via TONSEL Setting
zRDS(ON) Current Sensing and Programmable Current Limit combined with Enable Control
zSelectable PWM, DEM, or Ultrasonic Mode
zInternal Soft-Start and Soft-Discharge
zHigh Efficiency up to 97%
z5mW Quiescent Power Dissipation
zThermal Shutdown
zRoHS Compliant and Halogen Free
Applications
zNotebook and Sub-Notebook Computers
z3-Cell and 4-Cell Li+ Battery-Powered Devices
Marking Information
For marking information, contact our sales representative directly or through a Richtek distributor located in your area.
DS8223A/B-04 April 2011 |
www.richtek.com |
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1 |
RT8223A/B
Pin Configurations
(TOP VIEW)
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VOUT1 |
PGOOD |
BOOT1 |
UGATE1 |
PHASE1 |
LGATE1 |
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24 |
23 |
22 |
21 |
20 |
19 |
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ENTRIP1 |
1 |
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18 |
NC |
FB1 |
2 |
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17 |
VREG5 |
REF |
3 |
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GND |
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16 |
VIN |
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TONSEL |
4 |
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15 |
PGND |
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FB2 |
5 |
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25 |
14 |
SKIPSEL |
ENTRIP2 |
6 |
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13 |
EN |
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7 |
8 |
9 |
10 |
11 |
12 |
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VOUT2 |
VREG3 |
BOOT2 |
UGATE2 |
PHASE2 |
LGATE2 |
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RT8223A |
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WQFN-24L 4x4 |
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VOUT1 |
PGOOD |
BOOT1 |
UGATE1 |
PHASE1 |
LGATE1 |
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24 |
23 |
22 |
21 |
20 |
19 |
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ENTRIP1 |
1 |
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18 |
ENC |
FB1 |
2 |
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17 |
VREG5 |
REF |
3 |
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GND |
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16 |
VIN |
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TONSEL |
4 |
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15 |
PGND |
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FB2 |
5 |
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25 |
14 |
SKIPSEL |
ENTRIP2 |
6 |
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13 |
EN |
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7 |
8 |
9 |
10 |
11 |
12 |
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VOUT2 |
VREG3 |
BOOT2 |
UGATE2 |
PHASE2 |
LGATE2 |
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RT8223B |
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WQFN-24L 4x4 |
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Typical Application Circuit
For Fixed Voltage Regulator
V
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V |
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IN |
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C1 |
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R7 |
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RT8223A |
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R9 |
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C9 |
C8 |
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3.9 |
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10µF |
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16 |
VIN |
UGATE2 |
10 |
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0 |
Q2 |
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10µF |
10µF |
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C6 |
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BSC119 |
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R8 |
0 |
N03S |
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0.1µF |
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BOOT2 |
9 |
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R4 0 |
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C7 |
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L2 |
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Q1 |
21 |
UGATE1 |
PHASE2 |
11 |
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0.1µF |
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4.7µH |
VOUT2 |
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BSC119 |
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3.3V |
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N03S |
R3 |
0 |
22 |
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12 |
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Q4 |
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BOOT1 |
LGATE2 |
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R10 |
C13 |
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C2 |
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BSC119 |
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220µF |
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L1 |
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PGND 15 |
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N03S |
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C10 |
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0.1µF |
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OUT1 |
6.8µH |
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20 |
PHASE1 |
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5V |
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VOUT2 |
7 |
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C3 |
R5 |
Q3 |
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19 |
LGATE1 |
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VREG5 |
17 |
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5V Always On |
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220µF |
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BSC119 |
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C5 |
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C4 |
N03S |
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R6 |
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4.7µF |
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24 |
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23 |
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100k |
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VOUT1 |
PGOOD |
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PGOOD Indicator |
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C11 |
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3 REF |
VREG3 |
8 |
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C12 |
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3.3V Always On |
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0.22µF |
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4.7µF |
R1 |
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Frequency Control |
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4 TONSEL |
ENTRIP1 |
1 |
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150k |
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R2 |
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PWM/DEM/Ultrasonic |
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14 |
SKIPSEL |
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ENTRIP2 |
6 |
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150k |
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ON |
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13 |
EN |
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GND Exposed Pad (25) |
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OFF |
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2 |
FB1 |
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5 |
FB2 |
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www.richtek.com |
DS8223A/B-04 April 2011 |
2 |
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V
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RT8223A/B |
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V |
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IN |
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C1 |
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R7 |
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RT8223B |
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R9 |
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C13 |
C12 |
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3.9 |
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10uF |
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16 |
VIN |
UGATE2 |
10 |
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0 |
Q2 |
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10µF |
10µF |
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C10 |
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BSC119 |
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R8 |
0 |
N03S |
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0.1µF |
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BOOT2 |
9 |
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R4 0 |
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C7 |
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L2 |
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Q1 |
21 |
UGATE1 |
PHASE2 |
11 |
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0.1µF |
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4.7µH |
VOUT2 |
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BSC119 |
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3.3V |
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N03S |
R3 |
0 |
22 |
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12 |
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Q4 |
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BOOT1 |
LGATE2 |
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R10 |
C17 |
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C2 |
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15 |
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BSC119 |
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220µF |
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L1 |
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PGND |
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N03S |
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C14 |
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OUT1 |
6.8µH |
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0.1µF |
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20 |
PHASE1 |
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5V |
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VOUT2 |
7 |
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C3 |
R5 |
Q3 |
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19 |
LGATE1 |
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VREG5 |
17 |
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5V Always On |
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220µF |
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BSC119 |
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C9 |
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C4 |
N03S |
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R6 |
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4.7µF |
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100k |
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24 |
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23 |
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VOUT1 |
PGOOD |
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PGOOD Indicator |
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ON |
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18 |
ENC |
VREG3 |
8 |
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C16 |
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3.3V Always On |
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OFF |
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3 REF |
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4.7µF |
R1 |
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C15 |
ENTRIP1 |
1 |
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150k |
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0.22µF |
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R2 |
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ON |
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13 |
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ENTRIP2 |
6 |
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150k |
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EN |
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OFF |
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FB1 |
2 |
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4 |
TONSEL |
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Frequency Control |
FB2 |
5 |
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14 |
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Exposed Pad (25) |
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PWM/DEM/Ultrasonic |
SKIPSEL |
GND |
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DS8223A/B-04 April 2011 |
www.richtek.com |
|
3 |
RT8223A/B
For Adjustable Voltage Regulator
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V |
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IN |
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C1 |
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R7 |
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RT8223A |
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R9 |
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C9 |
C8 |
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3.9 |
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10µF |
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16 |
VIN |
UGATE2 |
10 |
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0 |
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Q2 |
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10µF |
10µF |
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C6 |
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BSC119 |
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R8 |
0 |
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N03S |
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0.1µF |
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BOOT2 9 |
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R4 0 |
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C7 |
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L2 |
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Q1 |
21 UGATE1 |
PHASE2 |
11 |
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0.1µF |
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4.7µH |
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VOUT2 |
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BSC119 |
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3.3V |
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N03S |
R3 |
0 |
22 BOOT1 |
LGATE2 12 |
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Q4 |
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R10 |
C13 |
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C2 |
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PGND 15 |
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BSC119 |
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220µF |
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V |
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L1 |
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N03S |
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C10 |
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OUT1 |
6.8µH |
0.1µF |
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20 PHASE1 |
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5V |
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VOUT2 7 |
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C3 |
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Q3 |
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19 |
LGATE1 |
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R5 |
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FB2 |
5 |
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R13 |
C17 |
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220µF |
BSC119 |
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R1 |
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N03S |
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6.5k |
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C4 |
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ENTRIP1 1 |
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150k |
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C16 |
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24 VOUT1 |
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R2 |
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R14 |
0.1µF |
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C14 |
R11 |
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ENTRIP2 6 |
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150k |
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10k |
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15k |
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2 |
FB1 |
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Exposed Pad (25) |
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C15 |
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GND |
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R12 |
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3 |
REF |
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0.1µF |
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C11 |
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17 |
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10k |
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VREG5 |
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5V Always On |
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0.22µF |
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C5 |
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R6 |
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Frequency Control |
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4 TONSEL |
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4.7µF |
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100k |
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PGOOD 23 |
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PWM/DEM/Ultrasonic |
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14 SKIPSEL |
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PGOOD Indicator |
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ON |
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13 EN |
VREG3 |
8 |
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C12 |
3.3V Always On |
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OFF |
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4.7µF |
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V |
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IN |
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C1 |
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R7 |
RT8223B |
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R9 |
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C13 |
C12 |
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3.9 |
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10µF |
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16 VIN |
UGATE2 |
10 |
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0 |
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Q2 |
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10µF |
10µF |
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C10 |
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BSC119 |
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R8 |
0 |
N03S |
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0.1µF |
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BOOT2 9 |
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R4 0 |
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C7 |
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L2 |
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Q1 |
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21 UGATE1 |
PHASE2 |
11 |
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0.1µF |
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4.7µH |
VOUT2 |
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BSC119 |
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3.3V |
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N03S |
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R3 |
0 |
22 BOOT1 |
LGATE2 12 |
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Q4 |
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R10 |
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C17 |
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C2 |
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PGND 15 |
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BSC119 |
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220µF |
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L1 |
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N03S |
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C14 |
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6.8µH |
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0.1µF |
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20 PHASE1 |
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OUT1 |
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VOUT2 7 |
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5V |
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Q3 |
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19 LGATE1 |
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C3 |
R5 |
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R13 |
C21 |
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220µF |
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BSC119 |
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C4 |
N03S |
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FB2 5 |
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6.5k |
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C20 |
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R1 |
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24 VOUT1 |
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R14 |
0.1µF |
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C18 |
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ENTRIP1 1 |
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150k |
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R11 |
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R2 |
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10k |
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15k |
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2 FB1 |
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C19 |
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ON |
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ENTRIP2 |
6 |
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150k |
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R12 |
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18 ENC |
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0.1µF |
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GND Exposed Pad (25) |
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10k |
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OFF |
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3 REF |
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C15 |
VREG5 17 |
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5V Always On |
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0.22µF |
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C9 |
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R6 |
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ON |
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4.7µF |
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13 EN |
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100k |
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PGOOD 23 |
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OFF |
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PGOOD Indicator |
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Frequency Control |
4 TONSEL |
VREG3 8 |
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C16 |
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3.3V Always On |
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PWM/DEM/Ultrasonic |
14 SKIPSEL |
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4.7µF |
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|||||
www.richtek.com |
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DS8223A/B-04 |
April 2011 |
||||
4 |
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RT8223A/B
Function Block Diagram
|
TONSEL |
SKIPSEL |
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BOOT1 |
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BOOT2 |
UGATE1 |
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UGATE2 |
PHASE1 |
VREG5 |
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PHASE2 |
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VREG5 |
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SMPS1 |
SMPS2 |
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LGATE1 |
PWM Buck |
PWM Buck |
LGATE2 |
Controller |
Controller |
||
PGND |
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VOUT1 |
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VOUT2 |
FB1 |
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FB2 |
ENTRIP1 |
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ENTRIP2 |
EN |
Power-On |
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PGOOD |
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Sequence |
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ENC |
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Clear Fault Latch |
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GND |
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SW Threshold |
SW Threshold |
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Thermal |
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Shutdown |
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VREG5 |
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VREG3 |
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VREG5 |
REF |
VREG3 |
VIN |
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REF |
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Function Block Diagram
TONSEL VIN
VOUT |
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On-Time |
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TON |
Q |
R |
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Compute |
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1-Shot |
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TRIG |
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REF |
- |
+ |
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- |
Comp |
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+ |
- |
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+ |
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FB |
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Over-Voltage |
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1.1 x VREF |
+ |
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Fault |
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- |
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Latch |
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0.6 x VREF |
- |
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Blanking |
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+ |
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Time |
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Under-Voltage |
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- |
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0.9 x VREF |
+ |
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PGOOD |
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UGATE |
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TRIG |
TOFF |
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1-Shot |
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Q |
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LGATE |
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VREG5 |
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+ |
ENTRIP |
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- |
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Current |
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SS |
S |
+ Limit |
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Time |
- |
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- |
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+ |
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25kHz |
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+ |
PHASE |
Detector |
Zero |
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- |
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Detector |
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SKIPSEL |
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PWM Controller (One Side) |
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DS8223A/B-04 April 2011 |
www.richtek.com |
|
5 |
RT8223A/B
Functional Pin Description
ENTRIP1 (Pin 1)
Channel 1 enable and Current Limit setting Input. Connect a resistor to GND to set the threshold for channel 1 synchronous RDS(ON) sense. The GND − PHASE1 currentlimit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.5V to 2V range. There is an internal 10μA current source from VREG5 to ENTRIP1.
FB1 (Pin 2)
SMPS1 Feedback Input. Connect FB1 to VREG5 or GND for fixed 5V operation. Or connect FB1 to a resistive voltagedivider from VOUT1 to GND to adjust output from 2V to 5.5V.
REF (Pin 3)
2V Reference Output. Bypass to GND with a 0.22μF capacitor. REF can source up to 50μA for external loads. Loading REF degrades FBx and output accuracy according to the REF load regulation error.
TONSEL (Pin 4)
Frequency Selectable Input for VOUT1/VOUT2 respectively.
400kHz/500kHz : Connect to VREG5 or VREG3
300kHz/375kHz : Connect to REF
200kHz/250kHz : Connect to GND
FB2 (Pin 5)
SMPS2 Feedback Input. Connect FB2 to VREG5 or GND for fixed 3.3V operation. Or connect FB2 to a resistive voltage-divider from VOUT2 to GND to adjust output from 2V to 5.5V.
ENTRIP2 (Pin 6)
Channel 2 enable and Current Limit setting Input. Connect a resistor to GND to set the threshold for channel 2 synchronous RDS(ON) sense. The GND − PHASE2 current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.5V to 2V range. There is an internal 10μA current source from VREG5 to ENTRIP2.
VOUT2 (Pin 7)
SMPS2 Output Voltage Sense Input. Connect to the SMPS2 output. VOUT2 is an input to the on-time one shot circuit. It also serves as the SMPS2 feedback input in fixed voltage mode.
VREG3 (Pin 8)
3.3V Linear Regulator Output.
BOOT2 (Pin 9)
Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor according to the typical application circuits.
UGATE2 (Pin 10)
High-Side MOSFET Floating Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and BOOT2.
PHASE2 (Pin 11)
Inductor Connection for SMPS2. PHASE2 is the internal lower supply rail for the UGATE2 high side gate driver. PHASE2 is also the current-sense input for the SMPS2.
LGATE2 (Pin 12)
SMPS2 Synchronous-Rectifier Gate-Drive Output. LGATE2 swings between PGND and VREG5.
EN (Pin 13)
Master Enable Input. The REF/VREG5/VREG3 are enabled if it is within logic high level and disabled if it is less than the logic low level.
SKIPSEL (Pin 14)
Operation Mode Selectable Input.
Ultrasonic Mode : Connect to VREG5 or VREG3
Diode Emulation Mode : Connect to GND
PWM Mode : Connect to REF
GND [Exposed Pad (25)]
Analog Ground for SMPS controller. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.
www.richtek.com |
DS8223A/B-04 April 2011 |
6 |
|
RT8223A/B
PGND (Pin 15)
Power Ground for SMPS controller. Connect PGND externally to the underside of the exposed pad.
VIN (Pin 16)
High Voltage Power Supply Input for 5V/3.3V LDO and Feed-forward ON-Time circuitry.
VREG5 (Pin 17)
5V Linear Regulator Output.VREG5 is also the supply voltage for the low-side MOSFET driver and analog supply voltage for the device.
NC (Pin 18) (RT8223A)
No Internal Connection.
ENC (Pin 18) (RT8223B)
SMPSx Enable Input. Pull up to VREG3 or VREG5 to turn on both switcher channels. Short to GND to shutdown them.
LGATE1 (Pin 19)
SMPS1 Synchronous RectifierGateDrive Output. LGATE1 swings between PGND and VREG5.
PHASE1 (Pin 20)
Inductor Connection for SMPS1. PHASE1 is the internal lower supply rail for the UGATE1 high side gate driver. PHASE1 is also the current sense input for the SMPS1.
UGATE1 (Pin 21)
High-Side MOSFET Floating Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and BOOT1.
BOOT1 (Pin 22)
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor according to the typical application circuits.
PGOOD (Pin 23)
Power Good Output for channel 1 and channel 2. (Logical AND)
VOUT1 (Pin 24)
SMPS1 Output Voltage-Sense Input. Connect to the SMPS1 output. VOUT1 is an input to the on-time one shot circuit. It also serves as the SMPS1 feedback input in fixed-voltage mode.
DS8223A/B-04 April 2011 |
www.richtek.com |
|
7 |
RT8223A/B
Absolute Maximum Ratings (Note 1)
z VIN, EN to GND -------------------------------------------------------------------------------------------------------------- |
–0.3V to 30V |
z PHASEx to GND |
|
DC ------------------------------------------------------------------------------------------------------------------------------- |
–0.3V to 30V |
< 20ns ------------------------------------------------------------------------------------------------------------------------- |
−8V to 38V |
z BOOTx to PHASEx --------------------------------------------------------------------------------------------------------- |
–0.3V to 6V |
z ENTRIPx, SKIPSEL, TONSEL, PGOOD, to GND ------------------------------------------------------------------- |
–0.3V to 6V |
z VREG5, VREG3, FBx, VOUTx, ENC, REF to GND ---------------------------------------------------------------- |
–0.3V to 6V |
z UGATEx to PHASEx |
|
DC ------------------------------------------------------------------------------------------------------------------------------- |
–0.3V to 6V |
< 20ns ------------------------------------------------------------------------------------------------------------------------- |
−5V to 7.5V |
z LGATEx to GND |
|
DC ------------------------------------------------------------------------------------------------------------------------------- |
–0.3V to 6V |
< 20ns ------------------------------------------------------------------------------------------------------------------------- |
−2.5V to 7.5V |
z Power Dissipation, PD @ TA = 25°C |
|
WQFN-24L 4x4 -------------------------------------------------------------------------------------------------------------- |
1.923W |
z Package Thermal Resistance (Note 2) |
|
WQFN-24L 4x4, θJA --------------------------------------------------------------------------------------------------------- |
52°C/W |
WQFN-24L 4x4, θJC -------------------------------------------------------------------------------------------------------- |
7°C/W |
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------- |
260°C |
z Junction Temperature ------------------------------------------------------------------------------------------------------- |
150°C |
z Storage Temperature Range ---------------------------------------------------------------------------------------------- |
–65°C to 150°C |
z ESD Susceptibility (Note 3) |
|
HBM (Human Body Mode) ------------------------------------------------------------------------------------------------ |
2kV |
MM (Machine Mode) -------------------------------------------------------------------------------------------------------- |
200V |
Recommended Operating Conditions |
(Note 4) |
z Input Voltage, VIN ------------------------------------------------------------------------------------------------------------ |
6V to 25V |
z Junction Temperature Range ---------------------------------------------------------------------------------------------- |
−40°C to 125°C |
z Ambient Temperature Range ---------------------------------------------------------------------------------------------- |
−40°C to 100°C |
www.richtek.com |
DS8223A/B-04 April 2011 |
8 |
|
RT8223A/B
Electrical Characteristics
(VIN = 12V, EN = ENC = 5V, ENTRIP1 = ENTRIP2 = 2V, No Load on VREG5, VREG3, VOUT1, VOUT2 and REF, TA = 25°C, unless otherwise specified)
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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Input Supply |
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VIN Standby Supply |
IVIN_SBY |
VIN = 6V to 25V, Both SMPS Off, |
-- |
200 |
-- |
μA |
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Current |
EN = 5V, ENC = GND |
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VIN Shutdown Supply |
IVIN_SHDH |
VIN = 6V to 25V, ENTRIPx = EN = GND |
-- |
20 |
40 |
μA |
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Current |
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Quiescent Power |
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Both SMPSs On, FBx = SKIPSEL = REF |
-- |
5 |
7 |
mW |
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Consumption |
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VOUT1 = 5.3V, VOUT2 = 3.5V |
(Note 5) |
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SMPS Output and FB Voltage |
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VOUT1 Output Voltage in |
VOUT1 |
VIN = 6V to 25V, FB1= REF or 5V, |
4.975 |
5.05 |
5.125 |
V |
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Fixed Mode |
SKIPSEL = REF |
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VOUT2 Output Voltage in |
VOUT2 |
VIN = 6V to 25V, FB2 = REF or 5V, |
3.285 |
3.33 |
3.375 |
V |
|||
Fixed Mode |
SKIPSEL = REF |
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FBx in Output Adjustable |
FBx |
VIN = 6V to 25V |
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1.975 |
2 |
2.025 |
V |
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Mode |
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Output Voltage |
VOUTx |
SMPS1, SMPS2 |
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2 |
-- |
5.5 |
V |
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Adjustment Range |
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FBx Adjustable-mode |
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Fixed or Adj-Mode comparator threshold |
0.2 |
0.4 |
0.55 |
V |
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Threshold Voltage |
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DC Load Regulation |
VLOAD |
Either SMPS, SKIPSEL = REF, 0 to 5A |
-- |
−0.1 |
-- |
% |
|||
Either SMPS, SKIPSEL = VREG5, 0 to 5A |
-- |
−1.7 |
-- |
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Either SMPS, SKIPSEL = GND, 0 to 5A |
-- |
−1.5 |
-- |
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Line Regulation |
VLINE |
Either SMPS, VIN = 6V to 25V |
-- |
0.005 |
-- |
%/V |
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On Time |
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TONSEL = GND |
VOUT1 = 5.05V |
1895 |
2105 |
2315 |
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VOUT2 |
= 3.33V |
999 |
1110 |
1221 |
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On-Time Pulse Width |
tUGATEx |
TONSEL = REF |
VOUT1 = 5.05V |
1227 |
1403 |
1579 |
ns |
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VOUT2 |
= 3.33V |
647 |
740 |
833 |
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TONSEL = VREG5 |
VOUT1 = 5.05V |
895 |
1052 |
1209 |
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VOUT2 = 3.33V |
475 |
555 |
635 |
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Minimum Off-Time |
tLGATEx |
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200 |
300 |
400 |
ns |
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Ultrasonic Mode |
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SKIPSEL = VREG5 or VREG3 |
20 |
28 |
-- |
kHz |
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Frequency |
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Soft Start |
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Soft-Start Time |
tSSx |
Zero to Full Limit from ENTRIPx Enable |
-- |
2 |
-- |
ms |
|||
Current Sense |
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Current Limit Threshold |
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VENTRIPx = VREG5, GND−PHASEx |
180 |
200 |
220 |
mV |
|||
(Default) |
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ENTRIPx Source Current |
IENTRIPx |
VENTRIPx = 0.9V |
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9.4 |
10 |
10.6 |
μA |
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ENTRIPx Current |
TCIENTRIPx |
|
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-- |
1600 |
-- |
PPM/°C |
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Temperature Coefficient |
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ENTRIPx Adjustment |
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VENTRIPx = IENTRIPx x RENTRIPx |
0.5 |
-- |
2 |
V |
|||
Range |
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To be continued |
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DS8223A/B-04 April 2011 |
www.richtek.com |
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9 |
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