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AAT1270_08 Datasheet, PDF (4/18 Pages) Advanced Analogic Technologies – 1A Step-Up Current Regulator for Flash LEDs
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PRODUCT DATASHEET
AAT1270
1A Step-Up Current Regulator for Flash LEDs
Electrical Characteristics1
VIN = 3.6V; CIN = 2.2μF; COUT = 2.2μF; L = 1μH; RSET = 162kΩ; TA = -40°C to +85°C, unless otherwise noted. Typical
values are TA = 25°C.
Symbol Description
Power Supply
VIN
VOUT(MAX)
Input Voltage Range
Maximum Output Voltage
IIN(Q)
VIN Supply Current
ISHDN(MAX)
IFL(TOTAL)
IFL(MATCH)
VIN Shutdown Current
Total Output Current, Flash Mode
FLOUTA and FLOUTB Current Matching
IMM(TOTAL) Total Output Current, Movie Mode
fOSC
Switching Frequency
tDEFAULT
TSD
Default ON time
Thermal Shutdown Threshold
TSD(HYS)
Thermal Shutdown Hysteresis
EN/SET/ FLEN/ FLINH Logic Control
VEN/SET(L),
VFLEN(L)
VEN/SET(H),
VFLEN(H)
EN/SET, FLEN Input Low Threshold
EN/SET, FLEN Input High Threshold
IEN/SET
IFLEN
EN/SET Input Leakage Current
FLEN Input Leakage Current
VT(FLINH) FLINH Input Threshold Voltage
RIN(FLINH)
tEN/SET(LOW)
tEN/SET(HI_MIN)
tEN/SET(HI_MAX)
tEN/SET(OFF)
tEN/SET(LAT)
tFLEN_ON
tFLEN_OFF
tFLINH_ON
tFLINH_OFF
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
Min Typ Max Units
2.7
5.5
5.5
FLEN = IN, Set FL Load = 1A
0.57 1
EN/SET = IN, Set FL Load = 0A, RSET = 162kΩ
EN/SET = FLEN = FLINH = GND
0.23
1
RSET = 162kΩ; FLOUTA + FLOUTB
800 1000 1200
10
RSET = 162kΩ; Movie Mode Current Set =
100%; FLOUTA + FLOUTB
137
TA = 25°C
CT = 47nF
1.5 2.0 2.5
1
140
15
V
V
mA
μA
mA
%
mA
MHz
s
°C
°C
VEN/SET = VIN = 5V
VFLEN = VIN = 5V
EN/SET = GND
EN/SET = GND
0.4
V
1.4
V
-1
1
μA
-1
1
μA
½
VIN
V
200
kΩ
0.3
75
μs
50
ns
75
μs
500
μs
500
μs
100
μs
20
μs
100
μs
5
μs
1. The AAT1270 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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1270.2008.07.1.5
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