RT8204A 데이터 시트보기 (PDF) - Richtek Technology

부품명

상세내역

제조사

RT8204A

Single Synchronous Buck with LDO Controller

Richtek Technology 

RT8204A

Functional Pin Description

Pin No.

Pin Name

Pin Function

VOUT Sense Input. Connect to the output of PWM converter. VOUT is an

1

VOUT

input of the PWM controller.

Analog Supply Voltage Input for the internal analog integrated circuit. Bypass

2

VDD

to GND with a 1μF ceramic capacitor.

VOUT Feedback Input. Connect FB to a resistor voltage divider from VOUT to

3

FB

GND to adjust the output from 0.75V to 3.3V.

Power Good Signal Open-Drain Output of PWM Converter. This pin will be

4

PGOOD

pulled high when the output voltage is within the target range.

Power Good signal Open-Drain Output of LDO Regulator. This pin will be

5

LPGOOD

pulled high when the output voltage is within the target range.

LDO Feedback Input. Connect LFB to a resistor voltage divider from VOUT to

6

LFB

GND to adjust the output greater than 0.75V.

7

LDRV

Drive Signal for the LDO’s path MOSFET.

Low side N-MOSFET Gate-Drive Output for PWM. This pin swings between

8

LGATE

GND and VDDP.

VDDP is the gate driver supply for the external MOSFETs. Bypass to GND

9

VDDP

with a 1μF ceramic capacitor.

PWM Current Limit Setting and sense. Connect a resistor between OC to

10

OC

PHASE for current limit setting.

Inductor Connection. This pin is not only the zero-current-sense input for the

11

PHASE

PWM converter, but also the UGATE high side gate driver return.

High Side N-MOSFET Floating Gate-Driver Output for the PWM converter.

12

UGATE

This pin swings between PHASE and BOOT.

13

BOOT

Boost Capacitor Connection for PWM Converter. Connect an external

ceramic capacitor to PHASE and an external diode to VDDP.

LDO Enable Input with internal pull low resistor. LDO is enabled if LEN is

14

LEN

greater than the on level and disabled if LEN is less than the off level.

PWM Enable and Operation Mode Selection Input. Connect to VDD for diode

15

EN/DEM emulation mode, connect to GND for shutdown mode and floating the pin for

CCM mode.

VIN Sense Input. Connect to VIN through a resistor. TON is an input of the

16

TON

PWM controller.

17 (Exposed Pad) GND

Analog Ground and Power Ground. The exposed pad must be soldered to a

large PCB and connected to GND for maximum power dissipation.

DS8204A-05 April 2011

www.richtek.com

3

Share Link: