Document
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
www.DataSheet4U.com
Features
• • • • • • • • • • • • • • • • • Up to 88% Max power efficiency Wide input voltage range: 2.7V ~ 5.5V 1x, 1.5x, and 2x charge-pump modes Drive up to 4 white LEDs Default maximum current setting: 30mA each channel 120mA maximum output current through 4 channels Programmable switching frequency, default 1.2MHz Spread Spectrum Control with 10% frequency deviation 1-wire Serial Digital Interface (SDI) or PWM for dimming control Soft-start during power-up and mode switching Soft-stop during shutdown Short-circuit protection Over-voltage protection and under-voltage lockout Low shutdown current < 6µA Industry-leading low profile package DFN3030-12: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish / RoHS Compliant (Note 1)
General Description
The AP3154 is a high efficiency charge-pump white LED driver with 1x, 1.5x, 2x operating modes. The AP3154 operates on power supplies from 2.7v to 5.5v. It drives up to four channels of white LEDs while the intensity of each channel is configured by varying the respective current levels. Each channel can supply up to 30mA current. Up to four channels can be ganged together to provide maximum load current of 120mA. The Serial Digital Interface (SDI) provides the capability to configure the current for each LED channel. Some other key features, such as Up Spread Spectrum Control, different charge-pump switching frequencies (0.6MHz/1.2MHz/1.8MHz), and PWM dimming control, can also be programmed through the interface. The AP3154 has a built-in soft-start circuit to minimize the inrush current during power-up and mode switching. Various protections such as short-circuit, over-voltage, under-voltage, and thermal shutdown are integrated to ensure system reliability. The quiescent current of AP3154 during shutdown is less than 6µA.
Applications
• • • • • • Mobile Phone PDA (Personal Digital Assistant) White LED Backlighting Camera Flash LED Lighting LCD Modules Portable Devices
Ordering Information
AP 3154 F G - 7 Package F : DFN3030-12
Device AP3154FG-7
Notes:
Green G : Green
Packing 7 : Tape & Reel
Package Code F
Packaging (Note 2) DFN3030-12
7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7
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. 2. 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
AP3154 Rev. 2
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FEBRUARY 2009
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Diodes Incorporated
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
www.DataSheet4U.com
Pin Assignment
( Top View )
D4 SDI C1P C1N VOUT C2P
1 2 3 4 5 6 12 11
D3 D2 D1 GND VIN C2N
Exposed Pad
10 9 8 7
DFN3030-12
Pin Descriptions
Pin Name
D4 SDI C1P C1N VOUT C2P C2N VIN GND D1 D2 D3 GND
Pin #
1 2 3 4 5 6 7 8 9 10 11 12 EP PAD
Description
Current Sink Input #4. Connect to VOUT when un-used. 1-wire Serial Digital Interface Input / PWM input Positive Terminal of Flying Capacitor. Connect a 1µF capacitor between C1P and C1N. Negative Terminal of Flying Capacitor. The charge pump output voltage to drive load circuit. Connect a 1µF capacitor between this pin and ground. Positive Terminal of Flying Capacitor. Connect a 1µF capacitor between C2P and C2N. Negative Terminal of Flying Capacitor. Input Power Source. Connect a 1µF capacitor between this pin and ground. Ground. Current Sink Input #1. Connect to VOUT when un-used. Current Sink Input #2. Connect to VOUT when un-used. Current Sink Input #3. Connect to VOUT when un-used. Exposed Pad (bottom). Connect to ground underneath the package.
AP3154 Rev. 2
2 of 13 www.diodes.com
FEBRUARY 2009
©
Diodes Incorporated
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
www.DataSheet4U.com
Block Diagram
C2P C2N C1P C1N
VOUT
VIN
CHARGE PUMP SWITCHES
SHORT CIRCUIT PROTECTION
OVER VOLTAGE PROTECTION
SDI
SERIAL DIGITAL INTERFACE
DIGITAL CONTROL BLOCK
OUTPUT VOLTAGE REGULATION & LED SHORT CIRCUIT DETECTION
BANDGAP OSCILLATOR
D1 D2 D3
OVER TEMPERATURE PROTECTION UNDER VOLTAGE LOCKOUT
CURRENT CONTROL
D4
GND
Typical Application Circuit
VIN 1uF CIN 8 VIN C2P 6 1uF C2 1uF C1
7 C2N 3 C1P C1N AP3154 4
VOUT
5
D4 LED D3 LED D2 LED D1 LED
1uF COUT
SDI
2
SDI
GND 9
D4 D3 D2 D1
1 12 11 10
AP3154 Rev. 2
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FEBRUARY 2009
©
Diodes Incorporated
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
www.DataSheet4U.com
Absolute Maximum Ratings
Symbol
ESD HBM ESD MM
(Notes 3)
Description
Human Body Model ESD Protection Machine Model ESD Protection Input Voltage SDI to GND Voltage Maximum DC Output Current Maximum Power Dissipation Operating Junction Temperature Range
Value
2 200 -0.3 to 6 -0.3 to VIN + 0.3 150 0.85 -40 to 150
Units
KV V V V mA W °C
VIN
VSDI IOUT PD TJ
Notes:
3. Exceeding Absolute Maximum Ratings will cause permanent damage to the .