PROPRIETARY INFORMATION PRODUCT DATASHEET
AAT1271A
SwitchReg
TM
Typical Characteristics
Movie Mode Output Ripple
(I
FLOUTX
= 103mA/ch; V
IN
= 3.6V; L = 1µH)
1.5A Step-Up Current Regulator for Flash LEDs
Flash Mode Output Ripple
(I
FLOUTX
= 750mA/ch; V
IN
= 4V; L = 1µH)
V
OUT
(AC Coupled)
(50mV/div)
V
INDUCTOR
(2V/div)
I
INDUCTOR
(100mA/div)
100mA
V
OUT
(AC Coupled)
(50mV/div)
V
INDUCTOR
(2V/div)
I
INDUCTOR
(50mA/div)
1.65A
0V
0V
Time (500ns/div)
Time (200ns/div)
Flash LED Current Matching vs. Temperature
(I
FLOUTX
= 750mA/Ch; V
IN
= 4.2V; L = 1µH)
800
790
80
70
Flash On Time Delay vs. Input Voltage
(I
FLOUTX
= 750mA/ch; C
OUT
= 2.2µF; L = 1µH)
Output Current (mA)
780
770
760
750
740
730
720
710
700
-40
-15
10
35
T
FLEN_OND
(µs)
60
50
40
30
20
10
0
FLOUTA
FLOUTB
60
85
-40°C
25°C
85°C
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Temperature (°C)
Input Voltage (V)
Flash Timeout Delay vs. C
T
Capacitor
(I
FLOUTX
= 750mA/ch; V
IN
= 3.6V)
1200
Movie Mode Line Transient
(I
FLOUTX
= 103mA/ch; V
IN
= 4.2V to 3.6V)
Flash Timeout (ms)
1000
800
600
400
200
0
0
V
IN
(500mV/div)
I
FLOUTx
(AC Coupled)
(50mA/div)
4.2V
3.6V
20
40
60
80
100
120
140
C
T
Capacitor (nF)
Time (50µs/div)
6
www.analogictech.com
1271A.2008.07.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
