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AL3157 Datasheet(PDF) 2 Page - Diodes Incorporated

Part # AL3157
Description  HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING
PDF  9 Pages
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AL3157 Datasheet(HTML) 2 Page - Diodes Incorporated

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AL3157
HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER
FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT
AL3157
Document number: DS35116 Rev. 1 - 2
2 of 9
www.diodes.com
March 2011
© Diodes Incorporated
Pin Descriptions
Pin Name
Pin Number
Description
EN2
1
Enable Pin 2: Controls outputs D2, D3 and D4
PGND
2
Charge Pump Switch Ground: Connect to GND
CN
3
Negative Terminal of Flying Capacitor
VIN
4
Input Power Supply. Decouple with a 2.2µF capacitor between this pin and ground.
CP
5
Positive Terminal of Flying Capacitor
VOUT
6
Charge pump output to drive D1~D4 load circuit. Decouple with a 2.2µF capacitor between
this pin and ground.
D4
7
Current sink input #4. Drive up to 30mA LED current. Connect to VOUT when un-used.
D3
8
Current sink input #3. Drive up to 30mA LED current. Connect to VOUT when un-used.
GND
9
Ground
D2
10
Current sink input #2. Drive up to 30mA LED current. Connect to VOUT when un-used.
EN1
11
Enable Pin 1: Controls output D1
D1
12
Current sink input #1. Drive up to 210mA LED current. Connect to VOUT when un-used.
EP
EP PAD
Exposed Pad (bottom). Connect to GND directly underneath the package.
Functional Block Diagram
SHORT
CIRCUIT
PROTECTION
CN
CP
VIN
GND
CURRENT
CONTROL
CHARGE PUMP
SWITCHES
VOUT
OVER
VOLTAGE
PROTECTION
EN1
UNDER
VOLTAGE
LOCKOUT
BANDGAP
OSCILLATOR
OVER
TEMPERATURE
PROTECTION
D1
D2
D3
D4
EN2
DIGITAL CONTROL BLOCK



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