RT8223L/M
High Efficiency, Main Power Supply Controller for Notebook Computer
General Description
The RT8223L/M is a dual step-down, switch-mode power supply controller generating logic-supply voltages in battery-powered systems. It includes two Pulse Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and also features fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the PWM outputs. The RT8223L/M includes on-board power up sequencing, a power good output, internal soft-start, and soft-discharge output that prevents negative voltage during shutdown.
The constant on-time PWM scheme can operate without sense resistors and provide 100ns load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, the diode-emulation mode maximizes efficiency for light load applications. The RT8223L/M is available in a WQFN-24L 4x4 package.
Features
zConstant On-time Control with 100ns Load Step Response
zWide Input Voltage Range : 6V to 25V
zDual Adjustable Outputs from 2V to 5.5V
zFixed 3.3V and 5V LDO Output : 100mA
z2V Reference Voltage
zFrequency Selectable via TONSEL Setting
z4700ppm/°C RDS(ON) Current Sensing
zProgrammable 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
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
L : Default
M : 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.
DS8223L/M-04 April 2011 |
www.richtek.com |
1
RT8223L/M
Marking Information
RT8223LGQW |
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RT8223MGQW |
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EP= : Product Code |
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EQ= : Product Code |
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EP=YM |
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YMDNN : Date Code |
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EQ=YM |
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YMDNN : Date Code |
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DNN |
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DNN |
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RT8223LZQW |
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RT8223MZQW |
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EP : Product Code |
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EQ : Product Code |
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EP YM |
YMDNN : Date Code |
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EQ YM |
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YMDNN : Date Code |
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DNN |
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DNN |
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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 |
GND |
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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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WQFN-24L 4x4 |
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RT8223L
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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 |
GND |
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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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WQFN-24L 4x4 |
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RT8223M
www.richtek.com |
DS8223L/M-04 April 2011 |
2
RT8223L/M
Typical Application Circuit
VIN
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R8 |
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6V to 25V |
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C1 |
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RT8223L |
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R10 |
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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 |
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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0 |
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N03S |
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0.1µF |
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BOOT2 |
9 |
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R |
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BOOT2 |
C11 |
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L2 |
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R4 0 |
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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 |
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VOUT2 |
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BSC119 |
R |
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3.3V |
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N03S |
0 |
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Q4 |
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BOOT1 |
22 BOOT1 |
LGATE2 |
12 |
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R11 |
C17 |
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C2 |
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GND 15 |
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BSC119 |
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220µF |
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V |
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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OUT1 |
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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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R14 |
C21 |
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220µF |
BSC119 |
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R |
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6.5k |
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C4 |
N03S |
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ILIM1 |
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ENTRIP1 |
1 |
150k |
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C20 |
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24 VOUT1 |
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RILIM2 |
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R15 |
0.1µF |
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C18 |
R12 |
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6 |
150k |
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10k |
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ENTRIP2 |
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15k |
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2 FB1 |
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25 (Exposed Pad) |
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C19 |
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GND |
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R13 |
VREF |
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3 REF |
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0.1µF |
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C15 |
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10k |
2V |
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0.22µF |
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VREG5 |
17 |
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5V Always On |
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4 TONSEL |
C9 |
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Frequency Control |
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R6 |
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14 SKIPSEL |
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4.7µF |
100k |
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PWM/DEM/Ultrasonic |
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23 |
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PGOOD |
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PGOOD Indicator |
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13 EN |
8 |
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ON |
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VREG3 |
C16 |
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3.3V Always On |
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OFF |
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4.7µF |
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VIN
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R8 |
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6V to 25V |
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C1 |
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RT8223M |
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R10 |
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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 |
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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0 |
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N03S |
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0.1µF |
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BOOT2 |
9 |
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R |
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BOOT2 |
C11 |
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L2 |
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R4 0 |
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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 |
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V |
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BSC119 |
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OUT2 |
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N03S |
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0 |
22 BOOT1 |
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12 |
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Q4 |
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3.3V |
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LGATE2 |
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R11 |
C17 |
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R |
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BSC119 |
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220µF |
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L1 |
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C2 |
BOOT1 |
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GND |
15 |
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N03S |
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C14 |
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V |
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6.8µH |
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0.1µF |
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OUT1 |
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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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R14 |
C21 |
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220µF |
BSC119 |
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R |
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N03S |
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ILIM1 |
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6.5k |
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C4 |
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1 |
150k |
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ENTRIP1 |
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C20 |
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24 VOUT1 |
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RILIM2 |
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R15 |
0.1µF |
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C18 |
R12 |
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6 |
150k |
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10k |
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ENTRIP2 |
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15k |
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2 FB1 |
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25 (Exposed Pad) |
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C19 |
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GND |
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R13 |
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VREF |
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3 REF |
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0.1µF |
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C15 |
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10k |
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2V |
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0.22µF |
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VREG5 |
17 |
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Frequency Control |
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4 TONSEL |
C9 |
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R6 |
5V Always On |
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14 SKIPSEL |
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4.7µF |
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PWM/DEM/Ultrasonic |
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100k |
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PGOOD |
23 |
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PGOOD Indicator |
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ON |
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13 EN |
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VREG3 |
8 |
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3.3V Always On |
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OFF |
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C16 |
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ON |
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18 |
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4.7µF |
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ENC |
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OFF |
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DS8223L/M-04 |
April |
2011 |
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www.richtek.com |
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3 |
RT8223L/M
Functional Pin Description
Pin No. |
Pin Name |
Pin Function |
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Channel 1 Enable and Current Limit Setting Input. Connect a resistor to GND to |
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set the threshold for channel 1 synchronous RDS(ON) sense. The GND − PHASE1 |
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1 |
ENTRIP1 |
current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.515V to 3V |
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range. There is an internal 10μA current source from VREG5 to ENTRIP1. Leave |
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ENTRIP1 floating or drive it above 4.5V to shut down channel 1. |
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2 |
FB1 |
SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from VOUT1 |
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to GND to adjust output from 2V to 5.5V. |
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2V Reference Output. Bypass to GND with a minimum 0.22μF capacitor. REF can |
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3 |
REF |
source up to 100μA for external loads. Loading REF degrades FBx and output |
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accuracy according to the REF load-regulation error. |
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Frequency Selectable Input for VOUT1/VOUT2 respectively. |
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4 |
TONSEL |
400kHz/500kHz : Connect to VREG5 or VREG3 |
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300kHz/375kHz : Connect to REF |
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200kHz/250kHz : Connect to GND |
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5 |
FB2 |
SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from VOUT2 |
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to GND to adjust output voltage from 2V to 5.5V. |
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Channel 2 Enable and Current Limit Setting Input. Connect a resistor to GND to |
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6 |
ENTRIP2 |
set the threshold for channel 2 synchronous RDS(ON) sense. The GND − PHASE2 |
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current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.515V to 3V |
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range. There is an internal 10μA current source from VREG5 to ENTRIP2. Leave |
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ENTRIP1 floating or drive it above 4.5V to shut down channel 2. |
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7 |
VOUT2 |
Bypass Pin for SMPS2. Connect to the SMPS2 output to bypass efficient power |
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for VREG3 pin. VOUT2 is also for the SMPS2 output soft-discharge. |
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8 |
VREG3 |
3.3V Linear Regulator Output. |
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9 |
BOOT2 |
Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor |
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according to the typical application circuits. |
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10 |
UGATE2 |
Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and |
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BOOT2. |
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Switch Node for SMPS2. PHASE2 is the internal lower supply rail for the |
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11 |
PHASE2 |
UGATE2 high side gate driver. PHASE2 is also the current-sense input for the |
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SMPS2. |
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12 |
LGATE2 |
Lower Gate Driver Output for SMPS2. LGATE2 swings between GND and |
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VREG5. |
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13 |
EN |
Master Enable Input. The REF/VREG5/VREG3 are enabled if it is within logic |
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high level and disabled if it is less than the logic low level. |
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Operation Mode Selectable Input. |
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14 |
SKIPSEL |
Connect to VREG5 or VREG3 : Ultrasonic Mode |
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Connect to REF : PWM Mode |
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Connect to GND : DEM Mode |
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16 |
VIN |
Supply Input for 5V/3.3V LDO and Feed Forward On-Time circuitry. |
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17 |
VREG5 |
5V Linear Regulator Output. VREG5 is also the supply voltage for the lower gate |
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driver and analog supply voltage for the device. |
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NC |
No Internal Connection. |
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18 |
(RT8223L) |
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ENC |
SMPS Enable Input. Pull up to VREG3 or VREG5 to turn on both switch channels. |
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(RT8223M) |
Short to GND to shutdown them. |
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19 |
LGATE1 |
Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and |
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VREG5. |
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To be continued |
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www.richtek.com |
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DS8223L/M-04 April 2011 |
4
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RT8223L/M |
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Pin No. |
Pin Name |
Pin Function |
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Switch Node for SMPS1. PHASE1 is the internal lower supply rail for the |
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20 |
PHASE1 |
UGATE1 high side gate driver. PHASE1 is also the current-sense input for the |
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SMPS1. |
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21 |
UGATE1 |
Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and |
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BOOT1. |
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22 |
BOOT1 |
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor |
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according to the typical application circuits. |
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23 |
PGOOD |
Power Good Output for Channel 1 and Channel 2. (Logical AND). |
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24 |
VOUT1 |
Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass efficient power |
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for VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge. |
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15,25 |
GND |
Ground for SMPS Controller. The exposed pad must be soldered to a large PCB |
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(Exposed Pad) |
and connected to GND for maximum power dissipation. |
Function Block Diagram
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TONSEL SKIPSEL |
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BOOT1 |
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BOOT2 |
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UGATE1 |
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PHASE1 |
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UGATE2 |
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VREG5 |
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PHASE2 |
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VREG5 |
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LGATE1 |
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SMPS1 |
SMPS2 |
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VREG5 |
PWM Buck |
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PWM Buck |
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LGATE2 |
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Controller |
VREG5 |
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Controller |
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10µA |
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10µA |
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FB1 |
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VOUT2 |
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ENTRIP1 |
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FB2 |
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EN |
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Power-On |
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ENTRIP2 |
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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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SW5 Threshold |
SW3 Threshold |
GND |
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VOUT1 |
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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 |
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REF |
VREG3 |
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VIN |
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REF |
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DS8223L/M-04 |
April 2011 |
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www.richtek.com |
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5 |
RT8223L/M
Absolute Maximum Ratings (Note 1)
z VIN, EN to GND ------------------------------------------------------------------------------------------------- |
−0.3V to 30V |
z PHASEx to GND |
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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 |
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DC ------------------------------------------------------------------------------------------------------------------ |
−0.3V to (VREG5 + 0.3V) |
< 20ns ------------------------------------------------------------------------------------------------------------ |
−5V to 7.5V |
z LGATEx to GND |
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DC ------------------------------------------------------------------------------------------------------------------ |
−0.3V to (VREG5 + 0.3V) |
< 20ns ------------------------------------------------------------------------------------------------------------ |
−2.5V to 7.5V |
z Power Dissipation, PD @ TA = 25°C |
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WQFN-24L 4x4 ------------------------------------------------------------------------------------------------- |
1.923W |
z Package Thermal Resistance (Note 2) |
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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) |
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HBM (Human Body Mode) ----------------------------------------------------------------------------------- |
2kV |
MM (Machine Mode) ------------------------------------------------------------------------------------------- |
200V |
Recommended Operating Conditions |
(Note 4) |
z Supply Voltage, VIN -------------------------------------------------------------------------------------------- |
6V to 25V |
z Junction Temperature Range --------------------------------------------------------------------------------- |
−40°C to 125°C |
z Ambient Temperature Range --------------------------------------------------------------------------------- |
−40°C to 85°C |
www.richtek.com |
DS8223L/M-04 April 2011 |
6
RT8223L/M
Electrical Characteristics
(VIN = 12V, VEN = VENC = 5V, VENTRIP1 = VENTRIP2 = 2V, No Load, TA = 25°C, unless otherwise specified)
Parameter |
Symbol |
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Test Conditions |
Min |
Typ |
Max |
Unit |
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Input Supply |
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VIN Standby Current |
IVIN_SBY |
VIN = 6V to 25V, ENTRIPx = GND |
-- |
200 |
-- |
μA |
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VIN Shutdown Supply |
IVIN_SHDN |
VIN = 6V to 25V, |
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-- |
20 |
40 |
μA |
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Current |
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ENTRIPx = EN = GND |
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Quiescent Power |
PVIN |
Both SMPS On, VFBx = 2.1V, |
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SKIPSEL = GND, VOUT1 = 5V, VOUT2 = 3.3V |
-- |
5 |
7 |
mW |
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Consumption |
+PPVCC |
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(Note 5) |
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SMPS Output and FB Voltage |
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DEM Mode |
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1.975 |
2 |
2.025 |
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FBx Voltage |
VFBx |
PWM Mode |
(Note 6) |
-- |
2 |
-- |
V |
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Ultrasonic Mode |
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-- |
2.032 |
-- |
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Output Voltage Adjust |
VOUTx |
SMPS1, SMPS2 |
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2 |
-- |
5.5 |
V |
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Range |
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VOUTx Discharge |
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VOUTx = 0.5V, VENTRIPx = 0V |
10 |
45 |
-- |
mA |
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Current |
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On-Time |
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TONSEL = |
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VOUT1 = 5.05V (200kHz) |
1895 |
2105 |
2315 |
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GND |
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VOUT2 = 3.33V (250kHz) |
999 |
1110 |
1221 |
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On-Time Pulse Width |
tON |
TONSEL = REF |
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VOUT1 = 5.05V (300kHz) |
1227 |
1403 |
1579 |
ns |
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VOUT2 = 3.33V (375kHz) |
647 |
740 |
833 |
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TONSEL = |
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VOUT1 = 5.05V (400kHz) |
895 |
1052 |
1209 |
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VREG5 |
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VOUT2 = 3.33V (500kHz) |
475 |
555 |
635 |
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Minimum Off-Time |
tOFF |
VFBx = 1.9V |
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200 |
300 |
400 |
ns |
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Ultrasonic Mode |
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SKIPSEL = VREG5 or VREG3 |
22 |
33 |
-- |
kHz |
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Frequency |
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Soft-Start |
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Soft-Start Time |
tSSx |
Internal Soft-Start |
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-- |
2 |
-- |
ms |
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Current Sense |
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ENTRIPx Source |
IENTRIPx |
VENTRIPx = 0.9V |
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9.4 |
10 |
10.6 |
μA |
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Current |
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ENTRIPx Current |
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Temperature |
TCIENTRIPx |
In Comparison with 25°C (Note 6) |
-- |
4700 |
-- |
ppm/°C |
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Coefficient |
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ENTRIPx Adjustment |
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VENTRIPx = IENTRIPx x RENTRIPx |
-- |
-- |
3 |
V |
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Range |
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Current Limit |
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GND − PHASEx, VENTRIPx = 2V |
180 |
200 |
220 |
mV |
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Threshold |
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Zero-Current |
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GND − PHASEx in DEM |
-- |
3 |
-- |
mV |
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Threshold |
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To be continued
DS8223L/M-04 April 2011 |
www.richtek.com |
7
RT8223L/M
Parameter |
Symbol |
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Test Conditions |
Min |
Typ |
Max |
Unit |
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Internal Regulator and Reference |
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VOUT1 = GND, IVREG5 < 100mA |
4.8 |
5 |
5.2 |
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VREG5 Output Voltage |
VVREG5 |
VOUT1 = GND, 6.5V < VIN < 25V, |
4.75 |
5 |
5.25 |
V |
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I |
< 100mA |
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VREG5 |
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VOUT1 = GND, 5.5V < VIN < 25V, |
4.75 |
5 |
5.25 |
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IVREG5 < 50mA |
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VOUT2 = GND, IVREG3 < 100mA |
3.2 |
3.33 |
3.46 |
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VREG3 Output Voltage |
VVREG3 |
VOUT2 = GND, 6.5V < VIN < 25V, |
3.13 |
3.33 |
3.5 |
V |
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I |
< 100mA |
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VREG3 |
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VOUT2 = GND, 5.5V < VIN < 25V, |
3.13 |
3.33 |
3.5 |
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IVREG3 < 50mA |
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VREG5 Output Current |
IVREG5 |
VVREG5 = 4.5V, VOUT1 = GND |
100 |
175 |
250 |
mA |
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VREG3 Output Current |
IVREG3 |
VVREG3 = 3V, VOUT2 = GND |
100 |
175 |
250 |
mA |
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VREG5 Switch-over |
VSW5 |
VOUT1 Rising Edge |
4.6 |
4.75 |
4.9 |
V |
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Threshold to VOUT1 |
VOUT1 Falling Edge |
4.3 |
4.4 |
4.5 |
V |
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VREG3 Switch-over |
VSW3 |
VOUT2 Rising Edge |
2.975 |
3.125 |
3.25 |
V |
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Threshold to VOUT2 |
VOUT2 Falling Edge |
2.775 |
2.875 |
2.975 |
V |
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VREGx Switch-over |
RSWx |
VREGx to VOUTx, 10mA |
-- |
1.5 |
3 |
Ω |
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Equivalent Resistance |
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REF Output Voltage |
VREF |
No External Load |
1.98 |
2 |
2.02 |
V |
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REF Load Regulation |
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0 < ILOAD < 100μA |
-- |
10 |
-- |
mV |
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REF Sink Current |
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REF in Regulation |
5 |
-- |
-- |
μA |
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UVLO |
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VREG5 Under Voltage |
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Rising Edge |
-- |
4.2 |
4.45 |
V |
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Lockout Threshold |
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Falling Edge |
3.7 |
3.9 |
4.1 |
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VREG3 Under Voltage |
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SMPSx off |
-- |
2.5 |
-- |
V |
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Lockout Threshold |
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Power Good |
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PGOOD Threshold |
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PGOOD Detect, FBx falling Edge |
82 |
85 |
88 |
% |
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Hysteresis, Rising Edge with SS Delay |
-- |
6 |
-- |
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Time |
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PGOOD Propagation |
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Falling Edge, 50mV Overdrive |
-- |
10 |
-- |
μs |
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Delay |
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PGOOD Leakage Current |
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High State, Forced to 5.5V |
-- |
-- |
1 |
μA |
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PGOOD Output Low |
|
ISINK = 4mA |
-- |
-- |
0.3 |
V |
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Voltage |
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Fault Detection |
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Over Voltage Protection |
VFB_OVP |
OVP Detect, FBx Rising Edge |
109 |
112 |
116 |
% |
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Trip Threshold |
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Over Voltage Protection |
|
FBx = 2.35V |
-- |
5 |
-- |
μs |
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Propagation Delay |
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Under Voltage Protection |
VFB_UVP |
UVP Detect, FBx Falling Edge |
49 |
52 |
56 |
% |
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Trip Threshold |
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To be continued |
www.richtek.com |
DS8223L/M-04 April 2011 |
8
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