High Efficiency, Low Noise, Fast Transient
400mA Step-Down Converter
Electrical Characteristics
1
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are T
A
= 25°C, V
IN
= 3.6V.
Symbol
Description
Conditions
Min
2.7
V
IN
Rising
Hysteresis
V
IN
Falling
I
OUT
= 0 to 400mA,
V
IN
= 2.7V to 5.5V
No Load
EN = AGND = PGND
600
0.45
0.40
V
IN
= 5.5V, V
LX
= 0 to V
IN
,
EN = GND
V
IN
= 2.7V to 5.5V
0.6V Output, No Load,
T
A
= 25°C
0.6V Output
From Enable to Output
Regulation
1
0.1
591
600
609
0.2
150
1.0
1.4
140
15
2.0
100
1.8
-3.0
0.6
160
3.0
V
IN
300
1.0
AAT1147
Typ
Max
5.5
2.7
Units
V
V
mV
V
%
V
µA
µA
mA
Ω
Ω
µA
%/V
mV
µA
µs
MHz
°C
°C
Step-Down Converter
V
IN
Input Voltage
V
UVLO
V
OUT
V
OUT
I
Q
I
SHDN
I
LIM
R
DS(ON)H
R
DS(ON)L
I
LXLEAK
ΔV
LINEREG
V
OUT
I
OUT
T
S
F
OSC
T
SD
T
HYS
EN
V
EN(L)
V
EN(H)
I
EN
Enable Threshold Low
Enable Threshold High
Input Low Current
UVLO Threshold
Output Voltage Tolerance
Output Voltage Range
Quiescent Current
Shutdown Current
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
LX Leakage Current
Line Regulation
Out Threshold Voltage Accuracy
Out Leakage Current
Start-Up Time
Oscillator Frequency
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
0.6
V
IN
= V
OUT
= 5.5V
1.4
-1.0
1.0
V
V
µA
1. The AAT1147 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
1147.2006.05.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
