AAT1142
800mA Voltage-Scaling Step-Down Converter
Electrical Characteristics1
L = 2.2µH, CIN = COUT = 10µF, 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 Converter
VIN
Input Voltage
2.7
5.5
2.7
V
V
VIN Rising
Hysteresis
VIN Falling
VUVLO
UVLO Threshold
250
mV
V
2.0
-3.0
0.6
IOUT = 0mA to 800mA,
VOUT
VOUT
Output Voltage Tolerance
3.0
2.0
%
V
VIN = 2.7V to 5.5V
VOUT Programmable Range
Output Voltage Programming
Slew Rate
VSLEW
COUT = 10µF
10
35
mV/µs
IQ
Quiescent Current
No Load
70
µA
µA
A
ISHDN
Shutdown Current
EN/SET = AGND = PGND
1.0
ILIM
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
LX Leakage Current
1.0
RDS(ON)H
RDS(ON)L
ILXLEAK
0.29
0.24
Ω
Ω
µA
VIN = 5.5V, VLX = 0V to VIN
VIN = 2.7V to 5.5V
1
ΔVOUT
VOUT*ΔVIN
/
Line Regulation
0.2
%/V
ROUT
Output Impedance
Start-Up Time
250
1.0
kΩ
µs
TS
From Enable to Output Regulation
100
2.2
FOSC
Oscillator Frequency
SYNC Frequency Range
Over-Temperature Shutdown
Threshold
MHz
MHz
FSYNC
3.0
TSD
140
15
°C
°C
Over-Temperature Shutdown
Hysteresis
THYS
1. The AAT1142 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
1142.2006.07.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
