AAT2557
500mA Battery Charger and 300mA
LDO Regulator for Portable Systems
1
Electrical Characteristics
VINLDO = VOUT(NOM) + 1V for VOUT options greater than 1.5V. IOUT = 1mA, COUT = 2.2µF, CIN = 1µF, CBYP = 10nF,
TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
Description
Conditions
Min Typ Max Units
Linear Regulator
I
OUTLDO = 1mA TA = 25°C
-1.5
-2.5
1.5
2.5
VOUT Output Voltage Tolerance
ꢀ
to 300mA
TA = -40°C to +85°C
VOUT
VDO
+
VIN
Input Voltage
5.5
V
2
3
VDO
ΔVOUT
VOUT*ΔVIN
Dropout Voltage
Line Regulation
IOUTLDO = 300mA
400
600
mV
ꢀ/V
/
VINLDO = VOUTLDO + 1 to 5.0V
OUTLDO = 300mA, VINLDO = VOUTLDO + 1
0.09
I
ΔVOUT(Line) Dynamic Line Regulation
2.5
60
mV
to VOUTLDO + 2, TR/TF = 2µs
ΔVOUT(Load) Dynamic Load Regulation IOUTLDO = 1mA to 300mA, TR <5µs
mV
mA
mA
µA
IOUT
ISC
IQ
Output Current
VOUTLDO > 1.2V
VOUTLDO < 0.4V
VINLDO = 5V; VENLDO = VIN
VINLDO = 5V; VENLDO = 0V
1kHz
300
Short-Circuit Current
Quiescent Current
Shutdown Current
600
70
125
1.0
ISHDN
µA
65
45
43
Power Supply Rejection
Ratio
PSRR
TSD
IOUTLDO =10mA 10kHz
1MHz
dB
°C
Over-Temperature
Shutdown Threshold
Over-Temperature
Shutdown Hysteresis
Output Noise
145
THYS
eN
12
50
22
15
°C
µVRMS
ppm/°C
Output Voltage
TC
Temperature Coefficient
Enable Time Delay
Enable Threshold Low
Enable Threshold High
Enable Input Current
TEN DLY
BYP Open
µs
V
V
_
VEN(L)
VEN(H)
IEN
0.6
1.0
1.5
VENLDO = 5.5V
µA
1. The AAT2557 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. VDO is defined as VIN - VOUT when VOUT is 98ꢀ of nominal.
3. For VOUT <2.3V, VDO = 2.5V - VOUT
.
4
2557.2007.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
