AAT2847
Four-Channel Backlight Driver with Dual LDOs
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Electrical Characteristics
VIN = 3.6V; CIN = CLDOA = CLDOB = 2.2µF; COUT = 1µF; C1 = C2 = 1µF; TA = 25°C, unless otherwise noted.
Typical values are at TA = 25°C.
Symbol
Description
Conditions
Min Typ Max Units
LDOs: AAT2847-EE
VENA = VENB = VIN, VEN/SET = 0V, No Load
VENA = VIN; VENB = 0V; VEN/SET = 0V; No Load
ILDO[A/B] = 1mA to 200mA
80
60
150
112
IIN
IN Operating Current
µA
VFBA, VFBB
VDO
Feedback Voltage
Dropout Voltage
1.17
1.2 1.23
150 300
V
mV
ILDO[A/B] = 150mA
ΔVOUT
OUT*ΔVIN
/
VIN = (VLDO[A/B] + 1V) to 5V
ILDO[A/B] =10mA, 1kHz
Line Regulation
0.09
50
%/V
dB
V
Power Supply Rejection
Ratio
PSRR
LDOs: AAT2847-QG
VENA = VENB = VIN, VEN/SET = 0V, No Load
VENA = VIN; VENB = 0V; VEN/SET = 0V; No Load
ILDOA = 1mA to 150mA
ILDOB = 1mA to 150mA
ILDOA = 150mA
80
60
150
112
IIN
IN Operating Current
µA
LDOA
LDOB
VDO
LDOA Voltage Tolerance
LDOB Voltage Tolerance
LDOA Dropout Voltage
2.716 2.8 2.884
1.455 1.5 1.545
150 300
V
V
mV
2
ΔVLDO[A/B]
LDO[A/B]*ΔVIN
/
LDOA, LDOB Line
Regulation
VIN = (LDOA + 1V) to 5V; VIN = (LDOB + 1.2V)
to 5V
0.09
50
%/V
dB
V
LDOA, LDOB Power
Supply Rejection Ratio
ILDO[A/B] =10mA, 1kHz
PSRR
LDOs: AAT2847-QI
VENA = VENB = VIN, VEN/SET = 0V, No Load
VENA = VIN; VENB = 0V; VEN/SET = 0V; No Load
ILDOA = 1mA to 150mA
ILDOB = 1mA to 150mA
ILDOA = 150mA
80
60
150
112
IIN
IN Operating Current
µA
LDOA
LDOB
VDO
LDOA Voltage Tolerance
LDOB Voltage Tolerance
LDOA Dropout Voltage
2.716 2.8 2.884
1.746 1.8 1.854
150 300
V
V
mV
2
ΔVLDO[A/B]
LDO[A/B]*ΔVIN
/
LDOA, LDOB Line
Regulation
VIN = (LDO[A/B] + 1V) to 5V
ILDO[A/B] =10mA, 1kHz
0.09
50
%/V
dB
V
LDOA, LDOB Power
Supply Rejection Ratio
PSRR
LDO Logic Control – All Options
VIL(ENA)
VIL(ENB)
,
ENA, ENB Input Logic
Low Threshold Voltage
0.4
V
V
VIH(ENA)
VIH(ENB)
,
ENA, ENB Input Logic
High Threshold Voltage
1.4
-1
ENA, ENB Input
Leakage
IEN[A/B]
VEN[A/B] = VIN = 5V
1
µA
1. The AAT2847 is guaranteed to meet performance specifications over the –40˚C to +85°C operating temperature range is assured by
design, characterization and correlation with statistical process controls.
2. VDO is defined as VIN - LDOA when LDOA is 98% of nominal.
2847.2007.09.1.0
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
