DS9610B Datasheet, PDF (2/12 Pages) Richtek Technology Corporation – High Voltage Synchronous Rectified Buck MOSFET Driver for Notebook Computer

RT9610B
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
EN
Enable pin. When low, both UGATE and LGATE are driven low and the normal
operation is disabled.
2
PHASE
Switch node. Connect this pin to the source of the upper MOSFET and the drain
of the lower MOSFET. This pin provides a return path for the upper gate driver.
3
UGATE
4
BOOT
5
PWM
6,
9 (Exposed Pad)
GND
7
LGATE
8
VCC
Upper gate drive output. Connect to the gate of high side power N-MOSFET.
Floating bootstrap supply pin for upper gate drive. Connect the bootstrap
capacitor between this pin and the PHASE pin. The bootstrap capacitor
provides the charge to turn on the upper MOSFET.
Control input for driver. The PWM signal can enter three distinct states during
operation. Connect this pin to the PWM output of the controller.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Lower gate drive output. Connect to the gate of the low side power N-MOSFET.
Input supply pin. Connect this pin to a 5V bias supply. Place a high quality
bypass capacitor from this pin to GND.
Functional Block Diagram
VCC
POR
EN
PWM
VCC
Control
Logic
R
Tri-State
Detect
R
Shoot-Through
Protection
VCC
BOOT
UGATE
PHASE
LGATE
GND
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is a registered trademark of Richtek Technology Corporation.
DS9610B-07 August 2016