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AAT3123ITP-20-T1 Datasheet

  • AAT3123ITP-20-T1

  • High Efficiency 1X/1.5X Fractional Charge Pump for White LED...

  • 18頁(yè)

  • ETC

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High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
General Description
The AAT3123/24 is a low noise, constant frequen-
cy charge pump DC/DC converter that uses a dual
mode Load Switch (1X) and fractional (1.5X) con-
version to maximize efficiency for White LED appli-
cations. The device can be used to produce current
levels up to 20mA to drive up to 6 LEDs from a
2.7V to 5.5V input. Outputs may be operated indi-
vidually or paralleled for driving higher-current
LEDs. Low external parts counts (two 1碌F flying
capacitors and two small 1碌F capacitors at V
IN
,
and OUT) make the AAT3123/24 ideally suited for
small battery-powered applications.
AnalogicTech鈩⑩€檚 Simple Serial Control鈩?/div>
(S
2
Cwire鈩? interface is used to enable, disable
and set the LED drive current with a 32 level loga-
rithmic scale LED brightness control. The
AAT3123/24 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 circuit-
ry 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 quiescent current to less
than 1碌A(chǔ). The AAT3123 is available in very small
12 pin TSOPJW package. The six output AAT3124
is available in a 16 pin 4x4mm QFN package.
AAT3123/4
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
ChargePump
鈩?/div>
Dual Mode 1x and 1.5x Charge Pump for
Maximum Efficiency
Drives Low-V
F
& High-V
F
Type LEDs
Up to 6 20mA Outputs
32 Position Logarithmic Scale with Digital
Control
Simple Serial Control鈩?(S
2
Cwire鈩? interface
Low Noise Constant Frequency Operation
1MHz Switching Frequency
Small Application Circuit
Regulated Output Current
Automatic Soft-Start
V
IN
Range: 2.7V to 5.5V
No Inductors
Iq < 1碌A(chǔ) in Shutdown
Temperature Range -40 to 85擄C.
16 pin 4x4 QFN package (AAT3124)
12 pin TSOPJW-12 package (AAT3123)
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
White LED Backlighting
White Photo-Flash for DSCs
Color (RGB) Lighting
Programmable Current Source
Typical Application
V
IN
C1+
C1
1碌F
V
BATTERY
C
IN
1碌F
C
OUT
1碌F
V
OUT
C1-
C2+
C2
1碌F
AAT3124
C2-
D1
D2
D3
D4
D5
D6
EN/SET
EN/SET
GND
D6
D5
D4
D3
D2
D1
3123.2003.09.1.1
1

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