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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Description
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 highercurrent LEDs. Low external part counts (one 1F flying capacitor and two 2.2F 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 1A. The AL3158 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package.
Pin Assignments
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Features
* * * * * * * * * * * * * * 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 <1A in Shutdown Thermally-Enhanced QFN3030-20 Package: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1)
http://www.diodes.com/products/lead_free.html
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
Typical Application Circuit
VIN 2.2uF CIN AL3158
8
VIN
CP CN VOUT
9
7 11 D1 LED D2 LED
1uF C1
EN1
EN2
EN3
D3 LED
D4 LED
D5 LED
D6 LED
D7 LED
D8 LED
D9 LED
2.2uF COUT
EN1
3
EN1
EN2
5
EN2
D1 D2 D3 D4
12 13 14 15
D5 16 EN3
4
EN3
D6 18 D7 1 D8 2 D9 GND
17 20
PGND
6
AL3158
Document number: DS35047 Rev. 2 - 2
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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 2.2F capacitor between this pin and ground. Positive Terminal of Flying Capacitor No-Connect Charge pump output to drive load circuit. Requires 2.2F 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.
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Functional Block Diagram
AL3158
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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Absolute Maximum Ratings (Note 2)
Symbol ESD HBM ESD MM VIN VEN1,2,3 IOUT TJ TLEAD Description Human Body Model ESD Protection Machine Model ESD Protection Input Voltage EN1, EN2, EN3 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
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Notes:
2. Exceeding Absolute Maximum Ratings will cause permanent damage to the device.
Recommended Operating Conditions
Symbol VIN TA Input Voltage Operating Ambient Temperature Parameter Min 2.7 -40 Max 5.5 85 Unit V C
Electrical Characteristics (TA = 25C, Vin = 3.6V,
Symbol IQ ISHDN IDX ID-Match Rout VTH VHS TSS Fsw VEN1, 2,3 (L) VEN1,2,3(H) TEN1,2,3 UVLO IEN1,2,3 TSHDN THYS JA Parameter Quiescent Current Shutdown Current ISINK Current Accuracy (Note 3) Current Matching Between Any Two Current Sink Inputs (Note 4) Open Loop VOUT Resistance
CIN = COUT = 2.2F, C1 = 1F Unless otherwise noted) Min Typ. 0.3 2 19 20 1 0.5 4.5 150 250 100 1.2 Max 0.6 mA 5 1 21 2 A mA % mV mV s MHz V V ms V A C C
o
Test Conditions 1x Mode, 3.0VIN5.5, Active, No Load Current 2x Mode, 3.0VIN5.5, Active, No Load Current EN1, EN2, EN3 = 0 VF: D1:D9 = 3.6V 1x mode 2 x mode
Unit
1x to 2x Transition Threshold at Any IDX = 20mA ISINK Pin Mode Transition Hysteresis Soft-Start Time Switching Frequency EN1,2,3 Threshold Low EN1,2,3 Threshold High EN1,2,3 Off Timeout VIN Under-Voltage Lockout EN1,2,3 Input Leakage Thermal shutdown Protection Thermal shutdown hysteresis Thermal Resistance Junction-toAmbient
VIN = 2.7V VIN = 5.5V
0.4 1.4 1.8 -1 2 160 10 20 2.2 1
QFN3030-20 (Note 5)
52
C/W
Notes: 3. Determined by the average current levels of all active channels. 4. Determined by the maximum sink current (MAX), the minimum sink current (MIN), and the average sink current (AVG). Two matching numbers are calculated as (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered as the matching data. 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.
AL3158
Document number: DS35047 Rev. 2 - 2
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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Typical Performance Characteristics
Turn-On to 1x Mode
EN1,2,3 2V/div EN1,2,3 2V/div
Turn-On to 2x Mode
Vout 2V/div Cp 2V/div
Vout 2V/div Cp 2V/div
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Iin 200mA/div
VIN=4.2V TA=25C IL=20mA
Iin 200mA/div
VIN=3.0V TA=25C IL=20mA
50us/div Turn-Off from 1x Mode
VIN=4.2V TA=25C IL=20mA
EN1,2,3 2V/div
100us/div Turn-Off from 2x Mode
VIN=3.0V TA=25C IL=20mA
EN1,2,3 2V/div
Vout 2V/div Cp 2V/div
Vout 2V/div Cp 2V/div
Iin 200mA/div
Iin 200mA/div
200ms/div Load Characteristics in 2x Mode
200ms/div PWM Dimming Control (Duty Cycle=50%)
Vin 200mVAC/div
EN 3.6V/div
Idx 50mA/div
VIN=3.0V TA=25C IL=20mA
Vout 200mVAC/div
Iin 100mAAC/div
VIN=3.6V Freq=20kHz Duty Cycle=50%
TA=25C
Iin 100mA/div
1us/div
10us/div
AL3158
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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Typical Performance Characteristics (Continued)
VF=3.1V TA=25C IL=20mA
Channels 1 to 9
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VIN=3.6V
Channels 1 to 9 VIN=3.6 V
TA=25C
VEN(H)
VEN(L) VIN=3.6V VIN=2.7V
AL3158
Document number: DS35047 Rev. 2 - 2
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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Functional Description
The AL3158 is a dual-mode high efficiency charge pump (1x and 2x) device, driving three groups of three LED channels at 30mA maximum each, 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.
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.
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The AL3158 requires only three external components: one 1F ceramic flying capacitor (C1) for the charge pump, one 2.2F ceramic input capacitor (CIN), and one 2.2F ceramic charge pump output capacitor (COUT). The each output channel of the AL3158 can drive three groups of three individual LED channels with a maximum current of fixed manufacture setting (20mA or 30mA) per channel. These can be paralleled to give a total output current of 270mA.
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.
EN<3:1>
XX0 XX1 X0X X1x 0XX 1xX
LED ON/OFF CONTROL
LED1~LED3 OFF LED1~LED3 ON LED4~LED6 OFF LED4~LED6 ON LED7~LED9 OFF LED7~LED9 ON
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.
PWM Dimming Control
The AL3158 provides simple PWM dimming control through ENx pins, and the current is adjusted by the duty cycle of the signal applied on ENx pin. The recommended PWM frequency is from 200Hz to 50KHz depending on applications.
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.
AL3158
Document number: DS35047 Rev. 2 - 2
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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Ordering Information
AL 3158 FS G - 7
Package FS : QFN3030-20
Package Code FS
Green G : Green
Packing 7 : Tape & Reel
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Device AL3158FSG-7
Notes:
Packaging (Note 7 and 8) QFN3030-20
7" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -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 XX : B8 : AL3158 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 Identification Code B8
Part Number AL3158FSG
AL3158
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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Package Outline Dimensions (All Dimensions in mm)
Package type: QFN3030-20
0.10 C 0.08 C 0.05 Max. 0.57/0.63 0.25 A
CL
0.15 Typ.
Seating Plane
Side View
C
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2X -
B
2.95/3.05
10
A
5
2.95/3.05
1.70/1.90
0.30/0.40
1.70/1.90
Pad Layout Top View
Pin1
15
(Pin #1 ID)
2X-
0.25 B
20
0.40 0.595 Typ.
0.16/0.26
0.10
CAB
Bottom View
AL3158
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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Taping Orientation (Note 9)
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Notes:
9. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf
AL3158
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AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.
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AL3158
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