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AL3158

HIGH EFFICIENCY 1x/2x CHARGE PUMP


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AL3158 pdf
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Description
Pin Assignments
The AL3158 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 AL3158 is capable of
driving three groups of three LED channels at 20mA from a 2.7V to
5.5V input. The current sinks may be operated using three simple
PWM dimming 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.
AL3158 PWM dimming inputs are used to enable, disable device
and dimming LED current with a fixed default current settings at
20mA or other factory programming options available.
Each output of the AL3158 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 AL3158 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
Three simple PWM dimming for RGB or WLED
Low transition threshold voltage typical 150 mV
Dual-Mode 1x and 2x Charge Pump
Drives up to 3 + 3 + 3 Channels of LEDs
1.2 MHz Constant Switching Frequency
VOUT short circuit and Thermal Protections
Soft Start for reducing inrush current
Under Voltage Lockout Protection
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
VIN 8 VIN
2.2uF
CP 9
CIN CN 7
AL3158
VOUT 11
1uF
C1
EN1
EN2
D1 D2 D3 D4 D5 D6 D7 D8 D9
LED LED LED LED LED LED LED LED LED
EN1
EN2
EN3
3 EN1
5 EN2
4 EN3
PGND
6
D1 12
D2 13
D3 14
D4 15
D5 16
D6 18
D7 20
D8 1
D9 2
GND
17
EN3
2.2uF
COUT
AL3158
Document number: DS35047 Rev. 2 - 2
1 of 10
www.diodes.com
January 2011
© Diodes Incorporated



No Preview Available !

AL3158 pdf
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Pin Descriptions
Pin Name
D8
D9
EN1
EN3
EN2
PGND
CN
VIN
CP
NC
VOUT
D1
D2
D3
D4
D5
D6
GND
D7
GND
Pin Number
1
2
3
4
5
6
7
8
9
10,19
11
12
13
14
15
16
18
17
20
EP PAD
Description
Current sink input #8. Connected to VOUT when un-used.
Current sink input #9. Connected to VOUT when un-used.
Enable Pin 1
Enable Pin 3
Enable 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.
Current sink input #6. Connected to VOUT when un-used.
Ground
Current sink input #7. Connected to VOUT when un-used.
Exposed Pad (bottom). Connected to GND directly underneath the package.
Functional Block Diagram
AL3158
Document number: DS35047 Rev. 2 - 2
2 of 10
www.diodes.com
January 2011
© Diodes Incorporated



Part Number AL3158
Description HIGH EFFICIENCY 1x/2x CHARGE PUMP
Maker Diodes - Diodes
Total Page 10 Pages
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