PRODUCT DATASHEET
AAT1271
SwitchReg
TM
Electrical Characteristics
1
V
IN
= 3.6V; C
IN
= 2.2μF; C
OUT
= 2.2μF; L = 1μH; R
SET
= 107kΩ; T
A
= -40°C to 85°C, unless otherwise noted. Typical
values are T
A
= 25°C.
Symbol
Description
Conditions
Min
2.7
EN/SET = FLEN = IN, Set FL Load = 1.5A
EN/SET = IN, FLEN = AGND
EN/SET = FLEN = FLINH = GND
R
SET
= 107kΩ; FLOUTA + FLOUTB
R
SET
= 107kΩ , Movie Mode Current Set =
100%; FLOUTA + FLOUTB
T
A
= 25˚C
C
T
= 74nF
0.67
0.23
1.2
1.5
10
206
1.5
2.0
600
140
15
2.5
1.5A Step-Up Current Regulator for Flash LEDs
Typ
Max
5.5
5.5
1
1
Units
V
V
mA
μA
A
%
mA
MHz
ms
°C
°C
V
V
Power Supply
Input Voltage Range
V
IN
V
OUT(MAX)
Maximum Output Voltage
I
IN(Q)
I
SHDN(MAX)
I
FL(TOTAL)
I
FL(MATCH)
I
MM(LOAD)
f
OSC
Supply Current
V
IN
Shutdown Current
Total Output Current, Flash Mode
FLOUTA and FLOUTB Current Matching
Total Output Current, Movie Mode
Switching Frequency
t
DEFAULT
Default ON Time
Thermal Shutdown Threshold
T
SD
T
SD(HYS)
Thermal Shutdown Hysteresis
EN/SET/ FLEN/ FLINH Logic Control
V
EN/SET(L)
,
EN/SET, FLEN Input Low Threshold
V
FLEN(L)
V
EN/SET(H)
,
EN/SET, FLEN Input High Threshold
V
FLEN(H)
I
EN/SET,
I
FLEN
EN/SET or FLEN Input Leakage Current
FLINH Input Threshold Voltage
V
T(FLINH)
R
IN(FLINH)
FLINH Input Resistance to AGND
t
EN/SET(LOW)
EN/SET Serial Interface Low Time
t
EN/SET(HI_ MIN)
Minimum EN/SET high Time
t
EN/SET(HI_ MAX)
Maximum EN/SET High Time
t
EN/SET(OFF)
EN/SET Off Timeout
t
EN/SET(LAT)
EN/SET Latch Timeout
t
FLEN_ON
FLEN ON Delay Time
t
FLEN_OFF
FLEN OFF Delay Time
t
FLINH_ON
FLINH ON Delay Time
t
FLINH_OFF
FLINH OFF Delay Time
0.4
1.4
FL
EN
/V
EN/SET
= V
IN
= 5V
-1
�½V
IN
200
0.3
50
75
500
500
EN/SET = GND
EN/SET = GND
40
10
93
5
75
1
μA
V
kΩ
μs
ns
μs
μs
μs
μs
μs
μs
μs
1. The AAT1271 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
4
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