AAT1271 Datasheet, PDF (4/19 Pages) Advanced Analogic Technologies – 1.5A Step-Up Current Regulator for Flash LEDs

SwitchReg^TM
PRODUCT DATASHEET
AAT1271
1.5A Step-Up Current Regulator for Flash LEDs
Electrical Characteristics¹
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
Power Supply
V_IN
V_OUT(MAX)
Input Voltage Range
Maximum Output Voltage
I_IN(Q)
Supply Current
I_SHDN(MAX)
I_FL(TOTAL)
I_FL(MATCH)
V_IN Shutdown Current
Total Output Current, Flash Mode
FLOUTA and FLOUTB Current Matching
I_MM(LOAD)
Total Output Current, Movie Mode
f_OSC
Switching Frequency
t_DEFAULT
Default ON Time
T_SD
Thermal Shutdown Threshold
T_SD(HYS)
Thermal Shutdown Hysteresis
EN/SET/ FLEN/ FLINH Logic Control
V_EN/SET(L),
V_FLEN(L)
V_EN/SET(H),
V_FLEN(H)
I I _{EN/SET, FLEN}
V_T(FLINH)
R_IN(FLINH)
t_EN/SET(LOW)
t_{EN/SET(HI_ MIN)}
t_{EN/SET(HI_ MAX)}
t_EN/SET(OFF)
t_EN/SET(LAT)
t_{FLEN_ON}
t_{FLEN_OFF}
t_{FLINH_ON}
t_{FLINH_OFF}
EN/SET, FLEN Input Low Threshold
EN/SET, FLEN Input High Threshold
EN/SET or FLEN Input Leakage Current
FLINH Input Threshold Voltage
FLINH Input Resistance to AGND
EN/SET Serial Interface Low Time
Minimum EN/SET high Time
Maximum EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
FLEN ON Delay Time
FLEN OFF Delay Time
FLINH ON Delay Time
FLINH OFF Delay Time
Conditions
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
FL_EN/V_EN/SET = V_IN = 5V
EN/SET = GND
EN/SET = GND
Min
2.7
1.2
1.5
1.4
-1
0.3
Typ Max Units
5.5
5.5
0.67 1
0.23
1
1.5
10
206
2.0 2.5
600
140
15
V
V
mA
μA
A
%
mA
MHz
ms
°C
°C
0.4
V
V
1
μA
½V_IN
V
200
kΩ
75
μs
50
ns
75
μs
500
μs
500
μs
40
μs
10
μs
93
μs
5
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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