AL3159

AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Description
Pin Assignments
NEW PRODUCT
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
•
•
•
•
•
•
•
•
•
•
•
•
•
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)
Notes:
Applications
•
•
•
Mobile Phone White LED Backlighting and Indicators
PDA White LED backlighting
Battery-operated Phone Main and Sub Screen White LED
Backlighting
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
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AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
NEW PRODUCT
Pin Descriptions
Pin Name
D8
D9
CTL1
CTL3
CTL2
PGND
CN
VIN
CP
NC
Pin Number
1
2
3
4
5
6
7
8
9
10,19
VOUT
11
D1
D2
D3
D4
D5
GND
D6
D7
GND
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
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© Diodes Incorporated
AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Absolute Maximum Ratings (Note 2)
NEW PRODUCT
Symbol
ESD HBM
ESD MM
VIN
VCTL1,2,3
IOUT
TJ
TLEAD
Notes:
Description
Human Body Model ESD Protection
Machine Model ESD Protection
Input Voltage
CTL1, CTL2, CTL3 to GND Voltage
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Rating
2
200
-0.3 to 6
-0.3 to VIN +0.3
270
150
300
Unit
KV
V
V
V
mA
°C
°C
2. Exceeding Absolute Maximum Ratings will cause permanent damage to the device.
Recommended Operating Conditions
Symbol
Min
Max
VIN
Input Voltage
Parameter
2.7
5.5
V
TA
Operating Ambient Temperature
-40
85
°C
Electrical Characteristics (TA = 25°C, VIN = 3.6V,
Symbol
IQ
ISHDN
IDX
ID-Match
Parameter
Quiescent Current
Shutdown Current
ISINK Current Accuracy (Note 3)
Current Matching Between Any Two
Current Sink Inputs (Note 4)
Unit
CIN = COUT = 2.2µF, C1 = 1µF Unless otherwise noted)
Test Conditions
1x Mode, 3.0≤VIN≤5.5, Active,
No Load Current
2x Mode, 3.0≤VIN≤5.5, Active,
No Load Current
CTL1, CTL2 and CTL3 = 0
Min
Typ.
Max
0.3
0.6
2
5
20
1
21
µA
mA
1
2
%
mA
19
VF: D1:D9 = 3.6V
1x mode
0.5
2 x mode
4.5
Rout
Open Loop VOUT Resistance
VTH
1x to 2x Transition Threshold at Any
IDX = 20mA
ISINK Pin
Unit
Ω
150
mV
VHS
Mode Transition Hysteresis
250
mV
TSS
Fsw
Soft-Start Time
Switching Frequency
CTL1,2,3 Threshold Low
CTL1,2,3 Threshold High
CTL1,2,3 Off Timeout
VIN Under-Voltage Lockout
CTL1,2,3 Input Leakage
Thermal shutdown Protection
Thermal shutdown hysteresis
Thermal Resistance Junction-toAmbient
100
1.2
µs
MHz
V
V
µs
V
µA
°C
°C
VCTL1, 2,3 (L)
VCTL1,2,3(H)
TCTL1,2,3
UVLO
ICTL1,2,3
TSHDN
THYS
θJA
VIN = 2.7V
VIN = 5.5V
0.4
1.4
1.8
-1
200
2.2
1
2
160
10
QFN3030-20 (Note 5)
o
48
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.
AL3159
Document number: DS35048 Rev. 2 - 2
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AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Typical Performance Characteristics
Turn-On to 1x Mode
Turn-On to 2x Mode
NEW PRODUCT
CTL1,2,3
2V/div
CTL1,2,3
2V/div
Vout
2V/div
Vout
2V/div
Cp
2V/div
Cp
2V/div
Iin
200mA/div
VIN=4.2V
TA=25°C
IL=20mA
Iin
200mA/div
VIN=3.0V
TA=25°C
IL=20mA
50us/div
100us/div
Turn-Off from 1x Mode
Turn-Off from 2x Mode
VIN=4.2V
TA=25°C
IL=20mA
CTL1,2,3
2V/div
VIN=3.0V
TA=25°C
IL=20mA
CTL1,2,3
2V/div
Vout
2V/div
Vout
2V/div
Cp
2V/div
Cp
2V/div
Iin
200mA/div
Iin
200mA/div
200ms/div
200ms/div
Load Characteristics in 2x Mode
Load Characteristics in 2x Mode
Vin
200mVAC/div
Vin
200mVAC/div
VIN=2.7V
TA=25°C
IL=20mA
Vout
200mVAC/div
VIN=3.0V
TA=25°C
IL=20mA
Iin
100mAAC/div
1us/div
AL3159
Document number: DS35048 Rev. 2 - 2
Vout
200mVAC/div
Iin
100mA/div
1us/div
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AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Typical Performance Characteristics (Continued)
Channels 1 to 9
NEW PRODUCT
VF=3.1V
TA=25°C
IL=20mA
VIN=3.6V
Channels 1 to 9
VIN=3.6 V
TA=25°C
VCTL(H)
VCTL(L)
VIN=3.6V
AL3159
Document number: DS35048 Rev. 2 - 2
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VIN=2.7V
January 2011
© Diodes Incorporated
AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Functional Description
NEW PRODUCT
The AL3159 is a dual-mode high efficiency charge pump
(1x and 2x) device, driving nine LED channels with three
simple logic control inputs, intended for white
LED backlight applications. An internal comparator circuit
compares the voltage at each constant current sink input
against a reference voltage. To ensure maximum power
efficiency, the most appropriate switching mode (1x and
2x) is automatically selected.
The AL3159 requires only three external components: one
1 µF ceramic flying capacitor (C1) for the charge pump,
one 2.2µF ceramic input capacitor (CIN), and one
2.2µF ceramic charge pump output capacitor (COUT).
The each output channel of the AL3159 can drive nine
individual LEDs with a maximum current of fixed
manufacture setting (20mA or 30mA) per channel. These
can be paralleled to give a total maximum output current of
270mA.
CTL<3:1>
LED ON/OFF CONTROL
000
001
010
011
100
101
110
111
ALL OFF
LED1~LED2 ON
LED3~LED5 ON
LED6~LED9 ON
LED9 ON
LED6~LED8 ON
LED1~LED5 ON
ALL ON
AL3159
Document number: DS35048 Rev. 2 - 2
Disabled Current Sinks
Unused current channels must be disabled by connecting
the sinks to VOUT with only a small sense current flowing
through the disabled channel.
Soft-Start
Soft-start is incorporated to prevent excessive inrush
current during power-up, mode switching, and
transitioning out of stand-by mode.
Short-Circuit Protection
Short-circuit protection function is incorporated to prevent
excessive load current when either flying cap terminals or
output pin electrically tied to a very lower voltage or
ground.
Over-Voltage Protection
Over-Voltage Protection function is incorporated to limit
the output voltage under a safe value to avoid on-chip
device breakdown.
Under-Voltage Lockout
Under-Voltage lockout feature disables the device when
the input voltage drops below UVLO threshold.
Thermal Auto Shutdown
When the die temperature exceeds the thermal limit, the
device will be disabled and enter stand-by mode. The
operation resumes whenever the die cools off sufficiently.
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AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Ordering Information
AL 3159 FS G - 7
Package
FS : QFN3030-20
NEW PRODUCT
Device
AL3159FSG-7
Notes:
Package
Code
FS
Green
G : Green
Packaging
(Note 7 and 8)
QFN3030-20
Packing
7 : Tape & Reel
Quantity
3000/Tape & Reel
7” Tape and Reel
Part Number Suffix
-7
7. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
8. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
Marking Information
(1) QFN3030-20
(Top View)
XX
YWX
Part Number
AL3159FSG
AL3159
Document number: DS35048 Rev. 2 - 2
XX : B9 : AL3159
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Package
QFN3030-20
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Identification Code
B9
January 2011
© Diodes Incorporated
AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Package Outline Dimensions (All Dimensions in mm)
0.15 Typ.
Package type: QFN3030-20
CL
0.10 C
B
2X -
0.25 A
Side View
C
2.95/3.05
A
10
1.70/1.90
Pin1
1.70/1.90
0.30/0.40
5
2.95/3.05
NEW PRODUCT
0.05 Max.
Seating Plane
0.57/0.63
0.08 C
Pad Layout Top View
15
(Pin #1 ID)
2X-
0.25 B
20
0.40
0.16/0.26
0.10
C A B
0.595 Typ.
Bottom View
AL3159
Document number: DS35048 Rev. 2 - 2
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AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
NEW PRODUCT
Taping Orientation (Note 9)
Notes:
9. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf
AL3159
Document number: DS35048 Rev. 2 - 2
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AL3159
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
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NEW PRODUCT
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Copyright © 2011, Diodes Incorporated
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AL3159
Document number: DS35048 Rev. 2 - 2
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