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AL3159

HIGH EFFICIENCY 1x/2x CHARGE PUMP


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AL3159 pdf
AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Description
Pin Assignments
The AL3159 is a low noise, constant frequency charge pump
DC/DC converter that uses a Dual mode load switch (1x), and (2x)
conversion for white LED applications. The AL3159 is capable of
driving nine LED channels at 20mA from a 2.7V to 5.5V input. The
current sinks may be operated using three simple logic control
inputs individually or in parallel for driving higher-current LEDs. Low
external part counts (one 1µF flying capacitor and two
2.2µF capacitors at VIN and VOUT) make this part ideally suited for
small, battery-powered applications.
AL3159 digital inputs are used to enable or disable the
LED channels with a fixed default current settings at 20mA or other
factory programming options available.
Each output of the AL3159 is equipped with built-in protection for
VOUT short circuit and auto-disable for LED short conditions. Built-in
soft-start circuitry prevents excessive inrush current during start-up
and mode switching. A low-current shutdown feature disconnects
the load from VIN to reduce quiescent current less than 1µA.
The AL3159 is available in a lead-free, space-saving, thermally
enhanced 20-pin 3 x 3mm QFN package.
Features
Applications
VIN range: 2.7V to 5.5V
Up to 93% Max Power Efficiency
1% Current Matching Accuracy Between Channels
Drives up to 9 configurable Channels of LEDs
Three simple logic decoding LED On/Off control inputs
Low transition threshold voltage typical 150 mV
Dual-Mode 1x and 2x Charge Pump
1.2 MHz Constant Switching Frequency
VOUT short circuit and Thermal Protections
Soft Start for reducing inrush current
IQ <1µA in Shutdown
Thermally-Enhanced QFN3030-20 Package: Available in
“Green” Molding Compound (No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
Mobile Phone White LED Backlighting and Indicators
PDA White LED backlighting
Battery-operated Phone Main and Sub Screen White LED
Backlighting
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
Typical Application Circuit
AL3159
Document number: DS35048 Rev. 2 - 2
1 of 10
www.diodes.com
January 2011
© Diodes Incorporated



No Preview Available !

AL3159 pdf
AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Pin Descriptions
Pin Name
D8
D9
CTL1
CTL3
CTL2
PGND
CN
VIN
CP
NC
VOUT
D1
D2
D3
D4
D5
GND
D6
D7
GND
Pin Number
1
2
3
4
5
6
7
8
9
10,19
11
12
13
14
15
16
17
18
20
EP PAD
Description
Current sink input #8. Connected to VOUT when un-used.
Current sink input #9. Connected to VOUT when un-used.
Control Pin 1
Control Pin 3
Control Pin 2
Charge Pump Switch Ground
Negative Terminal of Flying Capacitor
Input Power Supply. Requires 2.2µF capacitor between this pin and ground.
Positive Terminal of Flying Capacitor
No-Connect
Charge pump output to drive load circuit. Requires 2.2µF capacitor between this pin
and ground.
Current sink input #1. Connected to VOUT when un-used.
Current sink input #2. Connected to VOUT when un-used.
Current sink input #3. Connected to VOUT when un-used.
Current sink input #4. Connected to VOUT when un-used.
Current sink input #5. Connected to VOUT when un-used.
Ground
Current sink input #6. Connected to VOUT when un-used.
Current sink input #7. Connected to VOUT when un-used.
Exposed Pad (bottom). Connected to GND directly underneath the package.
Functional Block Diagram
AL3159
Document number: DS35048 Rev. 2 - 2
2 of 10
www.diodes.com
January 2011
© Diodes Incorporated



Part Number AL3159
Description HIGH EFFICIENCY 1x/2x CHARGE PUMP
Maker Diodes - Diodes
Total Page 10 Pages
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