AP3154A_15 Datasheet, PDF (1/14 Pages) Diodes Incorporated – 120mA HIGH EFFICIENCY WHITE LED DRIVER

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
V_IN
1uF
C_IN
8 _VIN
C2_P ⁶
1uF
C2_N ⁷
C₂
C1_P ³
1uF
C1_N ⁴
C₁
AP3154A
V_OUT ⁵
D4
D3
D2
D1
LED LED LED LED
2
SDI
SDI
D4 ¹
D3 ¹²
D2 ¹¹
GND ^{D1 10}
9
1uF
C_OUT
AP3154A Rev. 1
1 of 14
www.diodes.com
AUGUST 2009
© Diodes Incorporated