RT8856 데이터 시트보기 (PDF) - Richtek Technology

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RT8856

Multi-Phase PWM Controller for CPU Core Power Supply

Richtek Technology 

RT8856

Pin No.

30

31

32

33

34

35

36

37

38

39

40

41 (Exposed Pad)

Pin Name

Pin Function

Upper Gate Drive of Phase2. This pin drives the gate of the high side

UGATE2

MOSFETs.

Bootstrap Power Pin of Phase2. This pin powers the high side MOSFET drivers.

BOOT2 Connect this pin to the junction of the bootstrap capacitor with the cathode of the

bootstrap diode. Connect the anode of the bootstrap diode to the PVCC pin.

ISEN2_N Negative Input of Phase2 Current Sense.

ISEN2 Positive input of Phase2 Current Sense.

Over Current Protection Setting. Connect a resistive voltage divider from VCC to

OCSET ground and connect the joint of the voltage divider to the OCSET pin. The

voltage, VOCSET, determines the over current threshold, ILIM.

Thermal Detection Input for VRTT Circuit. Connect this pin with a resistive

NTC

voltage divider from VCC using NTC on the top to set the thermal management

threshold level.

VRTT

Voltage Regulator Thermal Throttling. This open-drain output pin indicates the

temperature exceeding the preset level when it is pulled low.

TON

Connect this pin to VIN with one resistor. This resistor value sets the ripple size

in ringing free mode.

VCC

Chip Power.

CLKEN

Inverted Clock Enable. This open-drain pin is an output indicating the start of the

PLL locking of the clock chip.

PGOOD Power Good Indicator.

GND

Ground. The exposed pad must be soldered to a large PCB and connected to

GND for maximum power dissipation.

www.richtek.com

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DS8856-03 June 2011

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