AAT1271A Datasheet, PDF (6/19 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
Movie Mode Output Ripple
(I_FLOUTX = 103mA/ch; V_IN = 3.6V; L = 1µH)
Flash Mode Output Ripple
(I_FLOUTX = 750mA/ch; V_IN = 4V; L = 1µH)
V_OUT
(AC Coupled)
(50mV/div)
V_INDUCTOR
(2V/div)
0V
I_INDUCTOR
(100mA/div)
100mA
Time (500ns/div)
V_OUT
(AC Coupled)
(50mV/div)
V_INDUCTOR
(2V/div)
0V
I_INDUCTOR
(50mA/div)
1.65A
Time (200ns/div)
Flash LED Current Matching vs. Temperature
(IFLOUTX = 750mA/Ch; VIN = 4.2V; L = 1µH)
800
790
780
770
760
750
740
730
720
FLOUTA
710
FLOUTB
700
-40
-15
10
35
60
85
Temperature (°C)
Flash On Time Delay vs. Input Voltage
(IFLOUTX = 750mA/ch; COUT = 2.2µF; L = 1µH)
80
70
60
50
40
30
20
-40°C
10
25°C
85°C
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Flash Timeout Delay vs. C_T Capacitor
(IFLOUTX = 750mA/ch; VIN = 3.6V)
1200
1000
800
600
400
200
0
0
20
40
60
80
100
120
140
C_T Capacitor (nF)
Movie Mode Line Transient
(I_FLOUTX = 103mA/ch; V_IN = 4.2V to 3.6V)
V_IN
(500mV/div)
I_FLOUTx
(AC Coupled)
(50mA/div)
4.2V
3.6V
Time (50µs/div)
6
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1271A.2008.07.1.0