RT9273 데이터 시트보기 (PDF) - Richtek Technology

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RT9273

High Performance, OLED + LED Driver for Dual Panel Mobile Phone

Richtek Technology 

Preliminary

RT9273

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

GND

2

FB2

3

CH2

4

VCC

5

CH1

6

FB1

7

EN

8

OVP

9

SP

10

LX

Exposed Pad (11) NC

Ground.

Feedback 2. Switching regulator feedback input. The feedback set point is

0.36V.Connect to a resistive divider between the switching regulator output and

GND to adjust the output voltage as SP pin pull high.

Channel 2. Internal FB loop. Connect the cathode of OLED to this pin.

Voltage Input Pin. Bypass a 2.2uF capacitor to GND to reduce the input noise.

Channel 1. Internal FB loop. Connect the cathode of LED to this pin.

Feedback 1. Internal feedback voltage to set FB current of CH1 as SP pin pull low.

Chip Enable Pin. Pull low or floating this pin to disable the system. Using a PWM

signal on EN pin can achieve the dimming control.

Over Voltage Protection. Detect over voltage condition and latch up the system until

SP, EN or UVLO reset. Connect directly to the output capacitor.

Selection Pin. Internal MOSFET selection. Pull low to turn on the internal CH1. Pull

high to turn on CH2. As SP input signal changes, internal MOSFET of LX pin will

turn off 1ms to prevent the over voltage damage by the output voltage instant

change.

Switch Pin. Connect this pin to inductor and schottky diode. Minimize the track area

to reduce EMI.

No Internal Connection.

DS9273-09 August 2007

www.richtek.com

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