RT8223P
Pin No.
Pin Name
Pin Function
Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor
according to the typical application circuits.
9
BOOT2
Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and
BOOT2.
Switch Node 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.
10
11
UGATE2
PHASE2
Lower Gate Driver Output for SMPS2. LGATE2 swings between GND and
VREG5.
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.
Operation Mode Selectable Input.
12
13
LGATE2
EN
Connect to VREG5 or VREG3 : Ultrasonic Mode
Connect to REF : PWM Mode
14
SKIPSEL
Connect to GND : DEM Mode
16
17
VIN
Supply Input for 5V/3.3V LDO and Feed Forward On-Time circuitry.
5V Linear Regulator Output. VREG5 is also the supply voltage for the lower gate
driver and analog supply voltage for the device.
VREG5
SMPS Enable Input. Pull up to VREG3 or VREG5 to turn on both switch channels.
Short to GND to shutdown them.
Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and
VREG5.
18
19
ENC
LGATE1
Switch Node 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.
Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and
BOOT1.
20
21
PHASE1
UGATE1
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor
according to the typical application circuits.
22
23
24
BOOT1
PGOOD
VOUT1
Power Good Output for Channel 1 and Channel 2. (Logical AND).
Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass efficient power
for VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge.
15, 25
(Exposed Pad)
Ground for SMPS Controller. The exposed pad must be soldered to a large PCB
and connected to GND for maximum power dissipation.
GND
DS8223P-01 June 2011
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
