RT9287 Просмотр технического описания (PDF) - Richtek Technology

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RT9287

Boost Converter for OLED Power with Dual LDO

Richtek Technology 

RT9287

Typical Application Circuit

Preliminary

VIN +

C1

2.7V to 5.5V

1uF

VOUT

=

R1+ R2

R2

×

VFB

VFB = 1.235 (typ.)

R2 > 100kΩ

VIN

CIN

1uF

Chip Enable

L1

4.7uH to 22uH

D1

SS0520

RT9287

R1

910k

7 VDD2

4 ENB

LX 6

FB 5

R2

105k

VFB = 1.235V (typ.)

1

VDD1

VLDO1 10

COUT1

1uF

VOUT1

2 EN1

3 EN2

VLDO1 9

GND 8

COUT2

1uF

VOUT2

VOUT

12V

C2

1uF/16V

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

VDD1

LDO Power Input Voltage.

2

EN1

LDO Channel 1 Enable. (Active High).

3

EN2

LDO Channel 2 Enable. (Active High).

Boost Enable (Active High). Voltage sensing input to trigger the function of over

4

ENB

voltage protection. Note that this pin is high impedance. There should be a pull

low 100kΩ resistor connected to GND when the control signal is floating.

Boost Feedback Reference Voltage Pin. Series connect a resistor between

5

FB

WLED and ground as a current sense. Sense the current feedback voltage to

set the current rating.

6

LX

Boost Switch Pin. Connect this Pin to inductor and catch diode. Minimize the

track area to reduce EMI.

7

VDD2

Boost Supply Input Voltage Pin. Bypass 1μF capacitor to GND to reduce the

input noise.

8

GND

GND pin should be soldered to PCB board and connected to GND.

9

VLDO2 LDO Channel 2 Output Voltage.

10

VLDO1

Exposed Pad (11) GND

LDO Channel 1 Output Voltage.

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

maximum power dissipation.

www.richtek.com

2

DS9287-01 August 2007

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