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AL3159FSG-7

P1-P3P4-P6P7-P9P10-P10
AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
AL3159
Document number: DS35048 Rev. 2 - 2
1 of 10
www.diodes.com
January 2011
© Diodes Incorporated
NEW PRODUCT
Description
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 V
IN
and V
OUT
) 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
V
OUT
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 V
IN
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
• V
IN
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
• V
OUT
short circuit and Thermal Protections
• Soft Start for reducing inrush current
• I
Q
<1µA in Shutdown
• Thermally-Enhanced QFN3030-20 Package: Available in
“Green” Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Pin Assignments
Applications
• 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
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
AL3159
Document number: DS35048 Rev. 2 - 2
2 of 10
www.diodes.com
January 2011
© Diodes Incorporated
NEW PRODUCT
Pin Descriptions
Pin Name Pin Number Description
D8 1 Current sink input #8. Connected to V
OUT
when un-used.
D9 2 Current sink input #9. Connected to V
OUT
when un-used.
CTL1 3 Control Pin 1
CTL3 4 Control Pin 3
CTL2 5 Control Pin 2
PGND 6 Charge Pump Switch Ground
CN 7 Negative Terminal of Flying Capacitor
V
IN
8 Input Power Supply. Requires 2.2µF capacitor between this pin and ground.
CP 9 Positive Terminal of Flying Capacitor
NC 10,19 No-Connect
V
OUT
11
Charge pump output to drive load circuit. Requires 2.2µF capacitor between this pin
and ground.
D1 12 Current sink input #1. Connected to V
OUT
when un-used.
D2 13 Current sink input #2. Connected to V
OUT
when un-used.
D3 14 Current sink input #3. Connected to V
OUT
when un-used.
D4 15 Current sink input #4. Connected to V
OUT
when un-used.
D5 16 Current sink input #5. Connected to V
OUT
when un-used.
GND 17 Ground
D6 18 Current sink input #6. Connected to V
OUT
when un-used.
D7 20 Current sink input #7. Connected to V
OUT
when un-used.
GND EP PAD Exposed Pad (bottom). Connected to GND directly underneath the package.
Functional Block Diagram
AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
AL3159
Document number: DS35048 Rev. 2 - 2
3 of 10
www.diodes.com
January 2011
© Diodes Incorporated
NEW PRODUCT
Absolute Maximum Ratings (Note 2)
Symbol Description Rating Unit
ESD HBM Human Body Model ESD Protection 2 KV
ESD MM Machine Model ESD Protection 200 V
V
IN
Input Voltage -0.3 to 6 V
V
CTL1,2,3
CTL1, CTL2, CTL3 to GND Voltage -0.3 to V
IN
+0.3 V
I
OUT
Maximum DC Output Current 270 mA
T
J
Operating Junction Temperature Range 150
°C
T
LEAD
Maximum Soldering Temperature (at leads, 10 sec) 300
°C
Notes: 2. Exceeding Absolute Maximum Ratings will cause permanent damage to the device.
Recommended Operating Conditions
Symbol Parameter Min Max Unit
V
IN
Input Voltage 2.7 5.5 V
T
A
Operating Ambient Temperature -40 85 °C
Electrical Characteristics (T
A
= 25°C, V
IN
= 3.6V, C
IN
= C
OUT
= 2.2µF, C
1
= 1µF Unless otherwise noted)
Symbol Parameter Test Conditions Min Typ. Max Unit
I
Q
Quiescent Current
1x Mode, 3.0≤V
IN
≤5.5, Active,
No Load Current
0.3 0.6
mA
2x Mode, 3.0≤V
IN
≤5.5, Active,
No Load Current
2 5
I
SHDN
Shutdown Current CTL1, CTL2 and CTL3 = 0 1 µA
I
DX
I
SINK
Current Accuracy (Note 3)
19 20 21 mA
I
D-Match
Current Matching Between Any Two
Current Sink Inputs (Note 4)
V
F
: D1:D9 = 3.6V 1 2 %
R
out
Open Loop V
OUT
Resistance
1x mode 0.5
Ω
2 x mode 4.5
V
TH
1x to 2x Transition Threshold at Any
I
SINK
Pin
I
DX
= 20mA 150 mV
V
HS
Mode Transition Hysteresis 250 mV
T
SS
Soft-Start Time 100 µs
Fsw Switching Frequency 1.2 MHz
V
CTL1, 2,3 (L)
CTL1,2,3 Threshold Low V
IN
= 2.7V 0.4 V
V
CTL1,2,3(H)
CTL1,2,3 Threshold High V
IN
= 5.5V 1.4 V
T
CTL1,2,3
CTL1,2,3 Off Timeout 200 µs
UVLO V
IN
Under-Voltage Lockout 1.8 2 2.2 V
I
CTL1,2,3
CTL1,2,3 Input Leakage -1 1 µA
T
SHDN
Thermal shutdown Protection 160
°C
T
HYS
Thermal shutdown hysteresis 10
°C
θ
JA
Thermal Resistance Junction-to-
Ambient
QFN3030-20 (Note 5)
48
o
C/W
Notes: 3. Determined by the average current levels of all active channels
4. Defined as the deviation of any sink current from the average of all active current channels.
5. Device mounted on FR-4 substrate, 2"*2", 2oz copper, double-sided PC board, with minimum recommended pad on top layer and
4 vias to bottom layer.
P1-P3P4-P6P7-P9P10-P10

AL3159FSG-7

Mfr. #:
Buy AL3159FSG-7
Manufacturer:
Diodes Incorporated
Description:
LED Lighting Drivers High EFF 2.7V - 5.5V 9-Ch LED 1.2 Mhz
Lifecycle:
New from this manufacturer.
Delivery:
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