PRODUCT DATASHEET
AAT2550178
SystemPowerTM
Total Power Solution for Portable Applications
Electrical Characteristics1
VIN = 3.6V; TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol Description
Conditions
Min Typ Max Units
Step-Down Converters A and B
VIN
Input Voltage
2.7
5.5
2.7
V
V
VIN Rising
VUVLO
Under-Voltage Lockout Threshold
Hysteresis
VIN Falling
IOUT = 0 to 600mA, VIN = 2.7V to 5.5V
100
mV
V
%
V
mA
μA
μA
A
μA
μA
kΩ
1.8
-3.0
0.6
VOUT
VOUT
IOUT
IQ
ISHDN
ILIM
ILX_LEAK
IFB_LEAK
RFB
Output Voltage Tolerance
Output Voltage Range
Output Current
Quiescent Current
Shutdown Current
P-Channel Current Limit
LX Leakage Current
Feedback Leakage
FB Impedance
3.0
VIN
600
70
Per Converter
Each Converter
VENA = VENB = GND
Each Converter
VIN = 5.5V, VLX = 0 to VIN, VENA = VENB = GND
VFB = 0.6V
27
1.0
0.8
1.0
1.0
0.2
VOUT > 0.6V
250
Feedback Threshold Voltage Accuracy
(0.6V Adjustable Version)
VFB
No Load, TA = 25°C
0.591
0.6
0.609
V
Ω
Ω
RDS(ON)H
RDS(ON)L
ΔVLineReg
FOSC
TSD
THYS
VEN(L)
VEN(H)
IEN
High-Side Switch On Resistance
Low-Side Switch On Resistance
Line Regulation
0.45
0.40
0.1
1.4
140
15
VIN = 2.7V to 5.5V
%/V
MHz
°C
°C
V
Switching Frequency
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Enable Threshold Low
Enable Threshold High
Input Low Current
0.6
1.0
1.4
-1.0
V
μA
VIN = VFB = 5.5V
1. The AAT2550 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.
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2550.2008.02.1.3
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
