AP3154A データシートの表示（PDF） - Diodes Incorporated.
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AP3154A Datasheet PDF : 14 Pages
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PART OBSOLETE
AP3154A
120mA HIGH EFFICIENCY WHITE LED DRIVER
Features
General Description
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: 20mA 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
Lead Free package: DFN3030-12
DFN3030-12: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish / RoHS Compliant (Note 1)
The AP3154A is a high efficiency charge-pump white LED driver
with 1x, 1.5x, 2x operating modes. The AP3154A 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. By default, all
4 channels are set to the minimum current level after the chip is
enabled or back from shutdown mode.
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 AP3154A 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 AP3154A during shutdown is less than 6µA.
Applications
Mobile Phone
PDA (Personal Digital Assistant)
White LED Backlighting
Camera Flash LED Lighting
LCD Modules
Portable Devices
Typical Application Circuit
VIN
1uF
CIN
8 VIN
C2P 6
1uF
C2N 7
C2
C1P 3
1uF
C1N 4
C1
AP3154A
VOUT 5
D4
D3
D2
D1
LED LED LED LED
2
SDI
SDI
D4 1
D3 12
D2 11
GND D1 10
9
1uF
COUT
AP3154A Rev. 1
1 of 14
www.diodes.com
AUGUST 2009
© Diodes Incorporated
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