PRODUCT DATASHEET
AAT2552178
SystemPowerTM
Total Power Solution for Portable Applications
Electrical Characteristics1
VINB = 3.6V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
Description
Conditions
Min
Typ Max
Units
Step-Down Converter
VIN
Input Voltage
2.7
7.5
2.6
V
V
mV
%
VINB Rising
Hysteresis
IOUTB = 0 to 300mA, VINB = 2.7V to 5.5V
VUVLO
UVLO Threshold
250
VOUT
VOUT
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
ILXLEAK
Output Voltage Tolerance2
Output Voltage Range
Quiescent Current
-3.0
0.6
3.0
VINB
90
1.0
V
No Load
VENB = GND
45
μA
μA
mA
Ω
Ω
μA
%
Shutdown Current
P-Channel Current Limit
High-Side Switch On Resistance
Low-Side Switch On Resistance
LX Leakage Current
300
0.3
0.5
VINB = 5.5V, VLX = 0 to VINB
IOUTB = 0mA to 300mA
VINB = 2.7V to 5.5V
VINB = 3.6V
1.0
ΔVOUT/ΔVOUT Load Regulation
ΔVLinereg/ΔVIN Line Regulation
0.4
0.1
0.6
%/V
V
VFB
IFB
FOSC
TS
Feedback Threshold Voltage Accuracy
FB Leakage Current
Oscillator Frequency
Startup Time
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Enable Threshold Low
Enable Threshold High
Input Low Current
0.591
0.609
0.2
VOUTB = 1.0V
μA
MHz
μs
°C
°C
V
1.5
120
140
15
From Enable to Output Regulation
TSD
THYS
VEN(L)
VEN(H)
IEN
0.6
1.0
1.4
-1.0
V
μA
VINB = VENB = 5.5V
Linear Regulator
TA = 25°C
TA = -40°C to +85°C
-1.5
-2.5
1.5
2.5
IOUTA = 1mA
to 300mA
VOUT
Output Voltage Tolerance
%
VOUT
VFB
VIN
VDO
ΔVOUT
Output Voltage Range
Feedback Voltage Accuracy
Input Voltage
1.2
1.22
VOUT + VDO
3.3
1.26
5.5
V
V
V
1.24
400
3
Dropout Voltage4
IOUTA = 300mA; VOUT = 3.3V
VINA = VOUTA + 1 to 5.0V
650
mV
/
Line Regulation
0.09
%/V
VOUT*ΔVIN
IOUT
ISC
IQ
ISHDN
Output Current
VOUTA > 2.0V
VOUTA < 0.4V
VINA = 5V; VENA = VIN
VINA = 5V; VENA = 0V
1kHz
300
mA
mA
μA
Short-Circuit Current
Quiescent Current
Shutdown Current
400
85
150
1.0
μA
70
50
30
140
15
95
8
PSRR
Power Supply Rejection Ratio
IOUTA =10mA
10kHz
1MHz
dB
TSD
THYS
eN
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Output Noise
Output Voltage Temperature Coefficient
Enable Threshold Low
°C
°C
μVRMS/√Hz
ppm/°C
eNBW = 100Hz to 100kHz
TC
VEN(L)
VEN(H)
IEN
0.6
1.0
V
V
μA
Enable Threshold High
Enable Input Current
1.4
VINA = VENA = 5.5V
1. The AAT2552 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.
2. Output voltage tolerance is independent of feedback resistor network accuracy.
3. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
4. For VOUT <2.3V, VDO = 2.5V - VOUT
.
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2552.2008.02.1.2
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