AAT1271A Datasheet, PDF (7/19 Pages) Advanced Analogic Technologies – 1.5A Step-Up Current Regulator for Flash LEDs

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PROPRIETARY INFORMATION PRODUCT DATASHEET
AAT1271A
1.5A Step-Up Current Regulator for Flash LEDs
Typical Characteristics
Flash Turn On Characteristic
(I_FLOUTX = 750mA/ch; V_IN = 3.6V; L = 1µH)
Movie Mode to Flash Turn On Characteristic
(I_FLOUTX = 103mA to 750mA/ch; V_IN = 3.6V; L = 1µH)
V_FLEN ^0V
(5V/div)
V_{OUT 0V}
(2V/div)
V_{SINK 0V}
(2V/div)
I_FLOUTX
(1A/div)
0V
V_FLEN
(2V/div) _0V
V_OUT
(2V/div)
2V
V_SINK
(500mV/div)
0V
I_FLOUTX
(1A/div)
0A
Time (50µs/div)
Time (50µs/div)
Movie Mode Turn On Characteristic
(I_FLOUTX = 103mA/ch; V_IN = 3.6V; L = 1µH)
V_EN/SET ^0V
(5V/div)
V_OUT
(2V/div)
0V
V_SINK
(500mV/div)
0V
I_FLOUTX
(100mA/div)
0A
Time (100µs/div)
Movie Mode Transition Characteristic
(I_FLOUTX = 103mA to 188mA/ch; C_OUT = 0.22µF;
V_IN = 3.6V; L = 1µH)
V_EN/SET
(2V/div) _0V
V_OUT
(2V/div)
0V
V_SINK
(500mV/div)
0V
I_FLOUTX
(100mA/div)
0A
Time (100µs/div)
Flash Timeout vs. Temperature
(IFLOUTX = 750mA/ch; VIN = 3.6V; CT = 47nF)
500
450
400
350
300
250
200
-40
-15
10
35
60
85
Temperature (°C)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
2.7
EN, FLEN High Threshold Voltage
vs. Input Voltage
85°C
25°C
-40°C
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
1271A.2008.07.1.0
www.analogictech.com
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