AAT1157
1MHz 1.2A Buck DC/DC Converter
Electrical Characteristics1
VIN = VCC = VP = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
Description
Conditions
Min Typ Max Units
VIN
Input Voltage Range
2.7
5.5
V
V
IN = VOUT + 0.2 to 5.5V,
VOUT
Output Voltage Tolerance
Load Regulation
-4
+4
%
IOUT = 0 to 1.2A
VIN = 4.2V, ILOAD = 0 to 1.2A
VIN =2.7 to 5.5V
No Load
∆VOUT/VOUT
∆VOUT(VOUT*∆VIN) Line Regulation
±2.5
±0.1
160
%
%/V
µA
µA
A
IQ
Quiescent Supply Current
300
1.0
ISHDN
ILIM
Shutdown Current
Current Limit
VEN = 0V, VIN = 5.5V
TA = 25°C
1.7
1.2
VIN Rising, VEN = VCC
2.5
0.6
VUVLO
Under-Voltage Lockout
V
VIN Falling, VEN = VCC
VUVLO(HYS)
VIL
Under-Voltage Lockout Hysteresis
Input Low Voltage
250
mV
V
VIH
Input High Voltage
1.4
V
IIL
Input Low Current
VIN = VFB = 5.5V
VIN = VFB = 0V
TA = 25°C
1.0
1.0
µA
µA
mΩ
mΩ
kHz
IIH
Input High Current
RDS(ON)H
RDS(ON)L
FOSC
High Side Switch On Resistance
Low Side Switch On Resistance
Oscillator Frequency
Over-Temperature Shutdown
Threshold
110
100
150
150
TA = 25°C
TA = 25°C
750
1000 1250
TSD
140
°C
°C
Over-Temperature Shutdown
Hysteresis
THYS
15
1. The AAT1157 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.
4
1157.2005.11.1.4
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
