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AAT3123 Datasheet(PDF) 1 Page - Advanced Analogic Technologies

Part No. AAT3123
Description  High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
3123.2005.12.1.4
1
ChargePump
General Description
The AAT3123/23A/24 is a low noise, constant fre-
quency charge pump DC/DC converter that uses a
dual mode load switch (1X) and fractional (1.5X)
conversion to maximize efficiency for white LED
applications. The device can be used to produce
current levels up to 20mA to drive up to six LEDs
from a 2.7V to 5.5V input. Outputs may be operat-
ed individually or paralleled for driving higher-cur-
rent LEDs. A low external parts count (two 1
µF fly-
ing capacitors and two small 1
µF capacitors at V
IN
and OUT) make the AAT3123/23A/24 ideally suited
for small battery-powered applications.
AnalogicTech’s Simple Serial Control™ (S
2Cwire™)
interface is used to enable, disable, and set the
LED drive current with a 32-level logarithmic scale
LED brightness control. The AAT3123/23A/24 has a
thermal management system to protect the device
in the event of a short-circuit condition at the output
pin. Built-in soft-start circuitry prevents excessive
inrush current during start-up. A high charge pump
switching frequency enables the use of very small
external capacitors. A low-current shutdown feature
disconnects the load from V
IN and reduces quies-
cent current to less than 1
µA. The device also inte-
grates a test current/auto-disable feature for each
channel. The AAT3123/23A is available in a very
small, Pb-free 12-pin TSOPJW package. The six
output AAT3124 is available in a Pb-free 16-pin
4x4mm QFN package.
Features
•V
IN Range: 2.7V to 5.5V
Dual Mode 1X and 1.5X Charge Pump for
Maximum Efficiency
Drives Low-V
F and High-VF Type LEDs
Up to Six 20mA Outputs (AAT3124)
Up to Four 20mA Outputs (AAT3123/23A)
32-Position Logarithmic Scale with Digital
Control
Simple Serial Control (S
2Cwire) Interface
Low Noise Constant Frequency Operation
1MHz Switching Frequency
Small Application Circuit
Regulated Output Current
Automatic Soft Start
No Inductors
•I
Q <1µA in Shutdown
Temperature Range: -40°C to +85°C
12-Pin TSOPJW Package (AAT3123/23A)
16-Pin 4x4mm QFN Package (AAT3124)
Applications
Color (RGB) Lighting
Programmable Current Source
White LED Backlighting
White Photo Flash for DSCs
Typical Application
CIN
1
µF
VBATTERY
COUT
1
µF
EN/SET
C1
1
µF
C2
1
µF
D6
D5
D4
D3
VIN
VOUT
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3124
D5
D6
D2
D1


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