Richtek RT8206AGQW, RT8206BGQW Schematic [ru]
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RT8206A/B
High-Efficiency, Main Power Supply Controllers for Notebook Computers
General Description
The RT8206A/B dual step-down, switch-mode powersupply (SMPS) controller generates logic-supply voltages in battery-powered systems. The RT8206A/B includes two pulse-width modulation (PWM) controllers fixed at 5V/ 3.3V or adjustable from 2V to 5.5V. An optional external charge pump can be monitored through SECFB (RT8206A). This device also features a linear regulator providing a fixed 5V output. The linear regulator provides up to 70mA output current with automatic linear-regulator bootstrapping to the BYP input. The RT8206A/B includes on-board power-up sequencing, the power-good outputs, internal soft-start, and internal soft-discharge output that prevents negative voltages on shutdown.
A 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 diodeemulation mode (DEM), which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive application.
The RT8206A/B is available in the WQFN-32L 5x5 package.
Features
zWide Input Voltage Range 6V to 25V
zDual Fixed 5V/3.3V Outputs or Adjustable from 2V to 5.5V, 1.5% Accuracy
zSecondary Feedback Input Maintains Charge Pump Voltage (RT8206A)
zIndependent Enable and Power Good
z5V Fixed LDO Output : 70mA
z2V Reference Voltage ±1% : 50uA
zConstant ON-Time Control with 100ns Load Step Response
zFrequency Selectable via TON Setting
zRDS(ON) Current Sensing and Programmable Current Limit
zSelectable PWM, DEM or Ultrasonic Mode
zInternal Soft-Start with 5 Steps Current Limiting 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
Ordering Information
RT8206 
Package Type
QW : WQFN-32L 5x5 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
A : With SECFB
B : Without SECFB
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.
Marking Information
RT8206AGQW
RT8206AGQW : Product Number
RT8206A YMDNN : Date Code
GQW
YMDNN
RT8206BGQW
RT8206BGQW : Product Number
RT8206B YMDNN : Date Code
GQW YMDNN
DS8206A/B-05 May 2011 |
www.richtek.com |
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1 |
RT8206A/B
Pin Configurations
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(TOP VIEW) |
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FB2 ILIM2 VOUT2 |
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SKIP PGOOD2 EN2 UGATE2 PHASE2 |
FB2 ILIM2 VOUT2 |
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SKIP PGOOD2 EN2 UGATE2 PHASE2 |
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32 |
31 |
30 |
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28 |
27 |
26 |
25 |
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REF |
1 |
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24 |
BOOT2 |
REF |
TON |
2 |
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23 |
LGATE2 |
TON |
VCC |
3 |
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22 |
PGND |
VCC |
ENLDO |
4 |
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GND |
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21 |
GND |
ENLDO |
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NC |
5 |
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20 |
SECFB |
NC |
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VIN |
6 |
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19 |
PVCC |
VIN |
LDO |
7 |
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33 |
18 |
LGATE1 |
LDO |
NC |
8 |
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17 |
BOOT1 |
NC |
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9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
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32 |
31 |
30 |
29 |
28 |
27 |
26 |
25 |
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1 |
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24 |
BOOT2 |
2 |
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23 |
LGATE2 |
3 |
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22 |
PGND |
4 |
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GND |
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21 |
GND |
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5 |
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20 |
NC |
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6 |
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19 |
PVCC |
7 |
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33 |
18 |
LGATE1 |
8 |
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17 |
BOOT1 |
9 |
10 |
11 |
12 |
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14 |
15 |
16 |
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BYP VOUT1 FB1 ILIM1 PGOOD1 EN1 UGATE1 PHASE1 |
BYP VOUT1 FB1 ILIM1 PGOOD1 EN1 UGATE1 PHASE1 |
WQFN-32L 5x5 |
WQFN-32L 5x5 |
RT8206A |
RT8206B |
Typical Application Circuit
VOUT1
5V
C3 220µF 
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V |
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IN |
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C1 |
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R14 |
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RT8206A/B |
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R9 |
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C13 |
6V to 25V |
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C12 |
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3.9 |
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10µF |
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6 |
VIN |
UGATE2 26 |
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0 |
Q2 |
10µF |
10µF |
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C18 |
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R8 |
0 |
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0.1µF |
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BOOT2 24 |
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R4 |
0 |
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C11 |
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L2 |
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Q1 |
15 UGATE1 |
PHASE2 25 |
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0.1µF |
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4.7µH |
VOUT2 |
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R3 |
0 |
17 BOOT1 |
LGATE2 23 |
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Q4 |
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3.3V |
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R10 |
C17 |
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L1 |
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C2 |
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PGND 22 |
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220µF |
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C14 |
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6.8µH |
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0.1µF |
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16 PHASE1 |
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VOUT2 30 |
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Q3 |
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18 LGATE1 |
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R5 |
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REF 1 |
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C15 |
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R6 |
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C4 |
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9 BYP |
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0.22µF |
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PGOOD1 |
13 |
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100k |
PV |
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10 |
VOUT1 |
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R13 |
CC |
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C5 |
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D1 |
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PGOOD2 28 |
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100k |
PVCC |
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C6 |
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0.1µF |
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D2 |
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3 VCC |
EN1 14 |
5V Enable |
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ON |
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0.1µF |
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C7 |
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C9 |
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EN2 27 |
3.3V Enable |
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OFF |
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D3 |
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0.1µF |
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1µF |
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C8 |
D4 |
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ENLDO 4 |
LDO Control |
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VIN |
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0.1µF |
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R1 |
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R11 |
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ILIM1 12 |
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180k |
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200k |
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20 SECFB/NC |
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R2 |
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R12 |
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11 |
FB1 |
ILIM2 |
31 |
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180k |
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39k |
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CP |
C19 |
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32 FB2 |
TON 2 |
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Frequency Control |
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R7 |
0 |
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19 |
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SKIP |
29 |
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PWM/DEM/Ultrasonic |
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PVCC |
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C16 |
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GND 21, Exposed Pad (33) |
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1µF |
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7 LDO |
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C10 |
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4.7µF |
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Figure 1. Fixed Voltage Regulator
www.richtek.com |
DS8206A/B-05 May 2011 |
2 |
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RT8206A/B
VOUT1
5V
C3 220µF 
C23
C20 0.1µF 
C1 |
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R14 |
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RT8206A/B |
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3.9 |
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10µF |
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6 |
VIN |
UGATE2 26 |
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C18 |
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0.1µF |
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BOOT2 24 |
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Q1 |
R4 0 |
15 |
UGATE1 |
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R3 |
0 |
17 |
BOOT1 |
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L1 |
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C2 |
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6.8µH |
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0.1µF |
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16 |
PHASE1 |
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R5 |
Q3 |
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18 |
LGATE1 |
C6 0.1µF
C8 0.1µF
C4 |
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D1 |
C5 |
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0.1µF |
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D2 |
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D3 |
C7 |
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0.1µF |
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D4 |
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R11 |
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200k |
9 BYP
10 VOUT1
3 VCC C9 
1µF
20 SECFB/NC
R12
PHASE2 25
LGATE2 23 PGND 22
VOUT2 30 FB2 32
REF 1
PGOOD1 13
PGOOD2 28
EN1 14
EN2 27 ENLDO 4
ILIM1 12
R9 |
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0 |
Q2 |
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R8 |
0 |
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C11 |
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0.1µF |
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Q4 |
C15 |
R6 |
0.22µF |
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100k |
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R13 |
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100k |
5V Enable |
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3.3V Enable |
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LDO Control |
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R1 |
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180k |
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V |
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IN |
C13 |
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6V to 25V |
C12 |
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10µF |
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10µF |
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L2 |
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V |
4.7µH |
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OUT2 |
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C17 |
3.3V |
R10 |
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220µF |
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C14 |
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R17 |
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C22 |
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11.5k |
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R18 |
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C21 |
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0.1µF |
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10k |
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PV |
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CC |
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PV |
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CC |
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ON |
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OFF |
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V |
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IN |
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R15 15k
R16 10k
CP |
39k |
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C19 |
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R7 |
0 |
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C16 |
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1µF |
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C10 |
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4.7µF |
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11 FB1
19 PVCC
7 LDO
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R2 |
ILIM2 31 |
180k |
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TON |
2 |
Frequency Control |
SKIP |
29 |
PWM/DEM/Ultrasonic |
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GND 21, Exposed Pad (33)
Figure 2. Adjustable Voltage Regulator
DS8206A/B-05 May 2011 |
www.richtek.com |
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3 |
RT8206A/B
Function Block Diagram
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TON |
SKIP |
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BOOT1 |
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BOOT2 |
UGATE1 |
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UGATE2 |
PHASE1 |
PVCC |
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PHASE2 |
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PVCC |
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LGATE1 |
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SMPS1 |
SMPS2 |
LGATE2 |
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PWM Buck |
PWM Buck |
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PGND |
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Controller |
Controller |
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VOUT1 |
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VOUT2 |
FB1 |
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FB2 |
ILIM1 |
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ILIM2 |
PGOOD1 |
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PGOOD2 |
GND |
SW Threshold |
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VCC |
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BYP |
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Internal |
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PVCC |
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Power-On |
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ENLDO |
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Logic |
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Sequence |
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EN1 |
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Clear Fault Latch |
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EN2 |
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LDO |
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Thermal |
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LDO |
REF |
REF |
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Shutdown |
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VIN |
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Function Block Diagram
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TON |
VIN |
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UGATE |
VOUT |
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On-Time |
TON |
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Q |
R |
TRIG |
TOFF |
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Compute |
1-Shot |
1-Shot |
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Q |
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TRIG |
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REF |
- |
+ |
- |
Comp |
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- |
+ |
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LGATE |
FB |
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Over-Voltage |
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Fault |
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VCC |
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1.1 x VREF |
+ |
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- |
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Latch |
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0.7 x VREF |
- |
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Blanking |
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+ |
ILIM |
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+ |
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Time |
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- |
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Under-Voltage |
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- |
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Current |
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Limit |
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0.9 x VREF |
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SS |
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+ |
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+ |
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Time |
- |
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PGOOD |
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25kHz |
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PHASE |
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Detector |
Zero |
- |
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Detector |
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SKIP |
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PWM Controller (One Side)
www.richtek.com |
DS8206A/B-05 May 2011 |
4
RT8206A/B
Functional Pin Description
REF (Pin 1)
2V Reference Output. Bypass to GND with a 0.22uF capacitor. REF can source up to 50uA for external loads. Loading REF degrades FBx and output accuracy according to the REF load-regulation error.
TON (Pin 2)
Frequency Select Input. (VOUT1/VOUT2 switching frequency, respectively) :
TON = VCC, (200kHz / 250kHz)
TON = REF, (300kHz / 375kHz)
TON = GND, (400kHz / 500kHz)
VCC (Pin 3)
Analog Supply Voltage Input for the PWM Core. Bypass to GND with a 1uF ceramic capacitor
ENLDO (Pin 4)
LDO Enable Input. The REF/LDO is enabled if ENLDO is within logic high level and disable if ENLDO is less than the logic low level.
NC (Pin 5, 8)
No Internal Connection.
VIN (Pin 6)
Power-supply Input. VIN is used for the constant on-time PWM one shot circuits. VIN is also used to power the linear regulators. The linear regulators are powered by SMPS1 if VOUT1 is set greater than 4.66V and BYP is tied to VOUT1. Connect VIN to the battery input and bypass with a 1uF capacitor.
LDO (Pin 7)
Linear-Regulator Output. LDO can provide a total of 70mA external loads. The LDO regulates a fixed 5V output. When the BYP is within 5V switchover threshold, the internal regulator shuts down and the LDO output pin connects to BYP through a 1.5Ω switch. Bypass LDO output with a minimum of 4.7uF ceramic.
BYP (Pin 9)
BYP is the switchover source voltage input for the LDO.
VOUT1 (Pin 10)
SMPS1 Output Voltage-Sense Input. Connect this pin to the SMPS1 output. VOUT1 is an input to the Constant on-time-PWM one-shot circuit. It also serves as the SMPS1 feedback input in fixed-voltage mode.
FB1 (Pin 11)
SMPS1 Feedback Input. Connect FB1 to VCC or GND for fixed 5V operation. Connect FB1 to a resistive voltagedivider from VOUT1 to GND to adjust output from 2V to 5.5V.
ILIM1 (Pin 12)
SMPS1 Current-Limit Adjustment. The GND − PHASE1 current-limit threshold is 1/10th the voltage seen at ILIM1 over a 0.5V to 2V range. There is an internal 5uA current source from VCC to ILIM1. The logic current limit threshold is default to 100mV if ILIM1 is higher than (VCC − 1V).
PGOOD1 (Pin 13)
SMPS1 Power-Good Open-Drain Output. PGOOD1 is low when the SMPS1 output voltage is more than 7.5% below the normal regulation point or during soft-start. PGOOD1 is high impedance when the output is in regulation and the soft-start circuit has terminated. PGOOD1 is low in shutdown.
EN1 (Pin 14)
SMPS1 Enable Input. The SMPS1 will be enabled if EN1 is greater than the logic high level and disabled if EN1 is less than the logic low level. If EN1 is connected to REF, the SMPS1 starts after the SMPS2 reaches regulation (delay start). Drive EN1 below 0.8V to clear fault level and reset the fault latches.
UGATE1 (Pin 15)
High-Side MOSFET Floating Gate-Driver Output for SMPS1. UGATE1 swings between PHASE1 and BOOT1.
PHASE1 (Pin 16)
Inductor Connection for SMPS1. PHASE1 is the internal lower supply rail for the UGATE1 high-side gate driver. PHASE1 is the current-sense input for the SMPS1.
DS8206A/B-05 May 2011 |
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5 |
RT8206A/B
BOOT1 (Pin 17)
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor according to the typical application circuits.
LGATE1 (Pin 18)
SMPS1 Synchronous-RectifierGate-drive Output. LGATE1 swings between PGND and PVCC.
PVCC (Pin 19)
PVCC is the supply voltage for the low-side MOSFET driver LGATEx. Connect a 5V power source to the PVCC pin (bypass with 1uF MLCC capacitor to PGND if necessary). There is an internal 10Ω connecting from PVCC to VCC. Make sure that both VCC and PVCC are bypassed with 1uF MLCC capacitors.
SECFB (Pin 20) (RT8206A)
The SECFB is used to monitor the optional external 14V charge pump. Connect a resistive voltage-divider from the 14V charge pump output to GND to detect the output. If SECFB drops below the threshold voltage, LGATE1 will be turned on for 300ns. This will refresh the external charge pump driven by LGATE1 without over-discharging the output voltage.
PHASE2 (Pin 25)
Inductor Connection for SMPS2. PHASE2 is the internal lower supply rail for the UGATE2 high-side gate driver. PHASE2 is the current-sense input for the SMPS2.
UGATE2 (Pin 26)
High-Side MOSFET Floating Gate-Driver Output for SMPS2. UGATE2 swings between PHASE2 and BOOT2.
EN2 (Pin 27)
SMPS2 Enable Input. The SMPS2 will be enabled if EN2 is greater than the logic high level and be disabled if EN2 is less than the logic low level. If EN2 is connected to REF, the SMPS2 starts after the SMPS1 reaches regulation (delay start). Drive EN2 below 0.8V to clear fault level and reset the fault latches.
PGOOD2 (Pin 28)
SMPS2 Power-Good Open-Drain Output. PGOOD2 is low when the SMPS2 output voltage is more than 7.5% below the normal regulation point or during soft-start. PGOOD2 is high impedance when the output is in regulation and the soft-start circuit has terminated. PGOOD2 is low in shutdown.
SKIP (Pin 29)
NC (Pin 20) (RT8206B)
No Internal Connection.
GND [Pin 21, Exposed Pad (33)]
Analog Ground for both SMPS and LDO. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.
PGND (Pin 22)
Power Ground for SMPS controller. Connect PGND externally to the underside of the exposed pad.
LGATE2 (Pin 23)
SMPS2 Synchronous-RectifierGate-drive Output. LGATE2 swings between PGND and PVCC.
BOOT2 (Pin 24)
Boost Flying Capacitor Connection for SMPS2. Connect this pin to an external capacitor according to the typical application circuits.
SMPS Operation Mode Control.
SKIP = GND : DEM operation
SKIP = REF : Ultrasonic Mode operation
SKIP = VCC : PWM operation.
VOUT2 (Pin 30)
SMPS2 Output Voltage-Sense Input. Connect this pin to the SMPS2 output. VOUT2 is an input to the constant on-time-PWM one-shot circuit. It also serves as the SMPS2 feedback input in fixed-voltage mode.
ILIM2 (Pin 31)
SMPS2 Current-Limit Adjustment. The GND − PHASE2 current-limit threshold is 1/10th the voltage seen at ILIM2 over a 0.5V to 2V range. There is an internal 5uA current source from VCC to ILIM2. The logic current limit threshold is default to 100mV value if ILIM2 is higher than (VCC − 1V).
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DS8206A/B-05 May 2011 |
6 |
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RT8206A/B
FB2 (Pin 32)
SMPS2 Feedback Input. Connect FB2 to VCC or GND for fixed 3.3V operation. Connect FB2 to a resistive voltagedivider from VOUT2 to GND to adjust output from 2V to 5.5V.
DS8206A/B-05 May 2011 |
www.richtek.com |
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7 |
RT8206A/B
Absolute Maximum Ratings (Note 1)
z VIN, ENLDO to GND ---------------------------------------------------------------------------------------------- |
–0.3V to 30V |
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z PHASEx to GND |
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DC--------------------------------------------------------------------------------------------------------------------- |
–0.3V to 30V |
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<20ns ---------------------------------------------------------------------------------------------------------------- |
–8V to 38V |
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z BOOTx to PHASEx ----------------------------------------------------------------------------------------------- |
–0.3V to 6V |
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z VCC, ENx, SKIP, TON, PVCC, PGOODx, to GND ------------------------------------------------------- |
–0.3V to 6V |
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z LDO, FBx, |
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–0.3V to (VCC + 0.3V) |
VOUTx, SECFB, REF, ILIMx to GND ---------------------------------------------------------- |
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z UGATEx to PHASEx |
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DC--------------------------------------------------------------------------------------------------------------------- |
–0.3V to (PVCC + 0.3V) |
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<20ns ---------------------------------------------------------------------------------------------------------------- |
–5V to 7.5V |
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z LGATEx, BYP to GND |
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DC--------------------------------------------------------------------------------------------------------------------- |
–0.3V to (PVCC + 0.3V) |
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<20ns ---------------------------------------------------------------------------------------------------------------- |
–2.5V to 7.5V |
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z PGND to GND ------------------------------------------------------------------------------------------------------ |
–0.3V to 0.3V |
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z Power Dissipation, PD @ TA = 25°C |
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WQFN-32L 5x5 ---------------------------------------------------------------------------------------------------- |
2.778W |
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z Package Thermal Resistance (Note 2) |
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WQFN-32L 5x5, θJA ----------------------------------------------------------------------------------------------- |
36°C/W |
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WQFN-32L 5x5, θJC ---------------------------------------------------------------------------------------------- |
7°C/W |
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z Junction Temperature --------------------------------------------------------------------------------------------- |
150°C |
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z Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------- |
260°C |
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z Storage Temperature Range ------------------------------------------------------------------------------------ |
–65°C to 150°C |
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z ESD Susceptibility (Note 3) |
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HBM (Human Body Mode) -------------------------------------------------------------------------------------- |
2kV |
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MM (Machine Mode) ---------------------------------------------------------------------------------------------- |
200V |
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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 85°C |
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DS8206A/B-05 May 2011 |
8 |
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To be continued |
RT8206A/B
Electrical Characteristics
(VIN = 12V, EN1 = EN2 = VCC, VBYP = 5V, PVCC = 5V, VENLDO = 5V, No Load on LDO, VOUT1, VOUT2 and REF, TA = 25°C, unless otherwise specified)
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Symbol |
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Test Conditions |
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Min |
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Typ |
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Max |
Unit |
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Input Supply |
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VIN Standby Supply Current |
IVIN_SBY |
VIN = 6V to 25V, Both SMPS Off, |
-- |
180 |
250 |
μA |
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ENLDO = 5V |
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VIN Shutdown Supply |
IVIN_SHDH |
VIN = 6V to 25V, |
-- |
20 |
40 |
μA |
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Current |
ENx = ENLDO = GND |
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Both SMPSs On, |
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Quiescent Power |
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FB1 = |
SKIP |
= GND, FB2 = VCC, |
-- |
5 |
7 |
mW |
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Consumption |
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VOUT1 = BYP = 5.3V, |
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VOUT2 = 3.5V (Note 5) |
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SMPS Output and FB Voltage |
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VOUT1 Output Voltage in |
VOUT1 |
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VIN = 6V to 25V, FB1= GND, |
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4.975 |
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5.05 |
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5.125 |
V |
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Fixed Mode |
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SKIP |
= 5V |
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VOUT2 Output Voltage in |
VOUT2 |
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VIN = 6V to 25V, FB2 = VCC, |
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3.375 |
V |
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Fixed Mode |
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SKIP = 5V |
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FBx in Output Adjustable |
FBx |
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VIN = 6V to 25V |
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1.975 |
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2 |
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V |
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SECFB Voltage |
SECFB |
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VIN = 6V to 25V (RT8206A) |
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1.92 |
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2 |
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2.08 |
V |
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Output Voltage Adjust |
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SMPS1, SMPS2 |
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2 |
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5.5 |
V |
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FBx Adjustable-mode |
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Fixed or Adj-Mode comparator |
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0.2 |
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0.4 |
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0.55 |
V |
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Threshold Voltage |
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threshold |
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Either SMPS, |
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= VCC, 0 to 5A |
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-- |
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−0.1 |
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-- |
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SKIP |
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DC Load Regulation |
VLOAD |
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Either SMPS, |
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= REF, 0 to 5A |
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−1.7 |
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-- |
% |
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SKIP |
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Either SMPS, |
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= GND, 0 to 5A |
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-- |
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−1.5 |
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-- |
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SKIP |
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Line Regulation |
VLINE |
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Either SMPS, VIN = 6V to 25V |
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-- |
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0.005 |
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-- |
%/V |
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On Time |
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TON = |
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SMPS1 = 5.05V (200kHz) |
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1895 |
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2105 |
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2315 |
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VCC |
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SMPS2 = 3.33V (250kHz) |
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999 |
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1110 |
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1221 |
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On-Time Pulse Width |
tUGATEx |
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TON = |
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SMPS1 = 5.05V (300kHz) |
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1227 |
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1403 |
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1579 |
ns |
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REF |
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SMPS2 = 3.33V (375kHz) |
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647 |
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740 |
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833 |
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TON = |
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SMPS1 = 5.05V (400kHz) |
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895 |
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1052 |
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1209 |
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GND |
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SMPS2 = 3.33V (500kHz) |
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475 |
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555 |
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635 |
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Minimum Off-Time |
tLGATEx |
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200 |
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300 |
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400 |
ns |
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Ultrasonic Mode Frequency |
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= REF |
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25 |
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33 |
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-- |
kHz |
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SKIP |
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Soft Start |
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Soft-Start Time |
tSSx |
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Zero to full limit from ENx Enable |
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-- |
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2 |
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-- |
ms |
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Current Sense |
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Current Limit Threshold |
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ILIMx = VCC, GND − PHASEx |
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90 |
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100 |
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110 |
mV |
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(Default) |
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Current Limit Current |
ILIMX |
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4.75 |
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5 |
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5.25 |
μA |
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Source |
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To be continued |
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DS8206A/B-05 May 2011 |
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www.richtek.com |
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9 |
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