RT9645 Ver la hoja de datos (PDF) - Richtek Technology

Número de pieza

componentes Descripción

Lista de partido

RT9645

5 Channels ACPI Regulator

Richtek Technology 

RT9645

Preliminary

Functional Pin Description

Pin No.

1

2

3

4

5

6

7

8

Pin Name

Function Description

SB3V_DRV Gate Drive for 3.3VSB Linear Controller. The pin will be high in S0, S3 and S5 state.

VDD

IC Power Supply. 5VSB is generally applied for bias power for IC logics and gate

driver control.

PWM2 Second PWM Output Signal

Second PWM Soft Start Ramp/Enable Control SS ramp slope is defined by

SS2/EN2

V/T = 5μA/CSS.

COMP2

Compensation pin of PWM2. Output of the PWM2 error amplifier. Connect

compensation network between this pin and FB2.

FB2

The output feedback of PWM2. The pin is applied for voltage regulation and provide

under-voltage protection.

BOOT

The pin is applied for VDDQ PWM bootstrapped power for the embedded driver

power.

UGATE

High-Side Drive. High-side MOSFET driver output of VDDQ PWM. Connect to gate

of high-side MOSFET.

Phase Node of VDDQ PWM. The pin is applied to sense phase node of VDDQ

9

PHASE

PWM for gates switch control.

Current Sense Input. Monitors the voltage drop across the low-side MOSFET for

10

ISNS

Over current protection. ROCSET1 x 40μA = RDS(ON) x IMAX

11

PVIN

Apply to Driver Power Source and generate Internal Power Good Signal.

Low-Side Drive. The low-side MOSFET driver output. Connect to gate of low-side

12

LGATE

MOSFET.

Compensation pin of VDDQ. Output of the VDDQ error amplifier. Connect

compensation network between this pin and FB1 In AMD Application. This pin can

13

COMP1

be used to control VDDQ sequence. This pin needs to be pulled low ( < VDIS1) to

disable the PWM.

The output feedback of PWM1. The pin is applied for voltage regulation,

14

FB1

under-voltage and Over Voltage protection.

PWM2 Current Sense Input. Monitors the voltage drop across the low-side

15

ISNS2

MOSFET for Over current protection. ROCSET2 x 40μA = RDS(ON) x IMAX

16

VTT_EN In AMD K8 Application, Connect this pin to VLDT_EN to control FSB_VTT Timing.

Feedback for the FSB_VTT Linear Controller. The pin is applied for FSB_VTT LDO

17

VTT_SEN

output regulation sense.

Gate drive for FSB_VTT Linear Controller. The pin will be turned off in S3 and S5

18

VTT_DRV

state.

19

GND

Signal Ground.

5VSB Control Switch. The pin is applied to drive an external P-Channel MOSFET to

20

SB5V_DRV

switch 5VDL power to 5VSB in S3 state. The pin goes high in S0 and S5 States.

VCC5 Control Switch. The pin is applied to driver an external N-Channel MOSFET

21

VCC_DRV

low in S5 and S3 States. The pin goes high in S0 State.

22

S5

ACPI Control Signal.

23

S3

ACPI Control Signal.

Feedback for the 3.3VSB Linear Controller. The pin is applied for 3.3V LDO output

24

SB3V_SEN

regulation sense.

Exposed Pad (25) PGND

The exposed pad must be soldered to a large PCB and connected to PGND for

maximum power dissipation.

www.richtek.com

4

DS9645-00 August 2007

Share Link: