AL3158FSG-7 Diodes Inc, AL3158FSG-7 Datasheet

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AL3158FSG-7

Manufacturer Part Number
AL3158FSG-7
Description
Charge Pumps High EFF 2.7V - 5.5V 3-Ch White LED 20mA
Manufacturer
Diodes Inc
Datasheet

Specifications of AL3158FSG-7

Output Current
270 mA
Supply Current
2 mA
Maximum Operating Temperature
+ 85 C
Package / Case
QFN-20
Input Voltage
2.7 V to 5.5 V
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Switching Frequency
1.2 MHz
Topology
Charge Pump
No. Of Outputs
3
Dimming Control Type
PWM
Operating Temperature Range
-40°C To +85°C
Driver Case Style
QFN
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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 higher-
current LEDs. Low external part counts (one 1µF flying capacitor
and two 2.2µF capacitors at V
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
V
soft-start circuitry prevents excessive inrush current during start-up
and mode switching. A low-current shutdown feature disconnects
the load from V
The AL3158 is available in a lead-free, space-saving, thermally
enhanced 20-pin 3 x 3mm QFN package.
• V
• 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
• V
• Soft Start for reducing inrush current
• Under Voltage Lockout Protection
• I
• Thermally-Enhanced QFN3030-20 Package: Available in “Green”
• Lead Free Finish/ RoHS Compliant (Note 1)
Notes:
Typical Application Circuit
AL3158
Document number: DS35047 Rev. 2 - 2
OUT
Molding Compound (No Br, Sb)
Q
short circuit and auto-disable for LED short conditions. Built-in
IN
OUT
<1µA in Shutdown
Range: 2.7V to 5.5V
short circuit and Thermal Protections
1.
http://www.diodes.com/products/lead_free.html
EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
IN
EN1
EN2
EN3
to reduce quiescent current less than 1µA.
V
IN
2.2uF
C
IN
IN
8
3
5
4
and V
EN1
EN2
EN3
V
IN
PGND
6
AL3158
OUT
) make this part ideally
GND
17
V
OUT
D1
D2
D3
D4
D5
D6
D7
D8
D9
C
C
P
N
18
12
13
14
15
16
20
11
1
2
9
7
LED
D1
LED
www.diodes.com
D2
1uF
C
1 of 10
1
LED
D3
Pin Assignments
Applications
• Mobile Phone White LED Backlighting and Indicators
• PDA White LED Backlighting
• Battery-operated Phone Main and Sub Screen White LED
LED
HIGH EFFICIENCY 1x/2x CHARGE PUMP
D4
EN1
Backlighting
LED
D5
FOR WHITE LED APPLICATIONS
LED
D6
LED
D7
EN2
LED
D8
LED
D9
EN3
2.2uF
AL3158
C
© Diodes Incorporated
OUT
January 2011

Related parts for AL3158FSG-7

AL3158FSG-7 Summary of contents

Page 1

... Mobile Phone White LED Backlighting and Indicators • PDA White LED Backlighting • Battery-operated Phone Main and Sub Screen White LED Backlighting 1uF C EN1 OUT LED LED LED LED LED GND www.diodes.com AL3158 EN3 EN2 2.2uF LED LED LED LED OUT January 2011 © Diodes Incorporated ...

Page 2

... Current sink input #6. Connected to V OUT Ground Current sink input #7. Connected to V OUT Exposed Pad (bottom). Connected to GND directly underneath the package www.diodes.com AL3158 when un-used. when un-used. when un-used. when un-used. when un-used. when un-used. when un-used. January 2011 © Diodes Incorporated ...

Page 3

... Min Max Unit 2.7 5.5 V -40 85 °C = 1µF Unless otherwise noted) 1 Min Typ. Max Unit 0.3 0 µ 0.5 Ω 4.5 150 mV 250 mV 100 µs 1.2 MHz 0 1 µA °C 160 ° C/W January 2011 © Diodes Incorporated ...

Page 4

... AC Vout 200mV /div AC V =3.6V IN Freq=20kHz Iin Duty Cycle=50% 100mA /div www.diodes.com AL3158 V =3. =25° =20mA L V =3. =25°C EN1,2,3 A 2V/div I =20mA L Vout 2V/div Cp 2V/div Iin 200mA/div EN 3.6V/div Idx 50mA/div Iin 100mA/div T =25°C A 10us/div January 2011 © Diodes Incorporated ...

Page 5

... Typical Performance Characteristics (Continued) AL3158 Document number: DS35047 Rev HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS V =3. =25° =20mA L Channels =25° =3.6V V =2. www.diodes.com AL3158 Channels =3. =3 EN(H) V EN(L) January 2011 © Diodes Incorporated ...

Page 6

... 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 www.diodes.com AL3158 January 2011 © Diodes Incorporated ...

Page 7

... Ordering Information Package FS : QFN3030-20 Package Device Code AL3158FSG-7 FS Notes: 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 ...

Page 8

... Pin1 (Pin #1 ID) 2X- 0. 0.40 0.595 Typ. Bottom View AL3158 Document number: DS35047 Rev HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS (All Dimensions in mm) Seating Plane 0.16/0. 0. www.diodes.com AL3158 Pad Layout Top View January 2011 © Diodes Incorporated ...

Page 9

... 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 AL3158 Document number: DS35047 Rev HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS www.diodes.com AL3158 January 2011 © Diodes Incorporated ...

Page 10

... 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. ...

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