1.5MHz, 250mA Step-Down Converter
Electrical Characteristics
1
V
IN
= 3.6V, T
A
= -40°C to +85°C, unless otherwise noted; typical values are T
A
= 25°C.
Symbol
V
IN
V
UVLO
V
OUT
V
OUT
I
Q
I
SHDN
I
LIM
R
DS(ON)H
R
DS(ON)L
I
LXLEAK
ΔV
Linereg
/ΔV
IN
V
FB
I
FB
F
OSC
T
S
T
SD
T
HYS
V
EN(L)
V
EN(H)
I
EN
AAT1121
Description
Input Voltage
UVLO Threshold
Output Voltage Tolerance
2
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
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
Conditions
V
IN
Rising
Hysteresis
V
IN
Falling
I
OUT
= 0 to 250mA,
V
IN
= 2.7V to 5.5V
No Load
EN = GND
Min
2.7
Typ
Max
5.5
2.6
Units
V
V
mV
V
%
V
μA
μA
mA
Ω
Ω
μA
%/V
V
μA
MHz
μs
°C
°C
V
V
μA
250
2.0
-3.0
0.6
30
1.0
600
0.59
0.42
3.0
V
IN
V
IN
= 5.5V, V
LX
= 0 to V
IN
V
IN
= 2.7V to 5.5V
V
IN
= 3.6V
V
OUT
= 1.0V
From Enable to Output
Regulation
1.0
0.597
0.2
0.606
1.5
100
140
15
0.6
1.4
-1.0
0.615
0.2
V
IN
= V
EN
= 5.5V
1.0
1. The AAT1121 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.
2. Output voltage tolerance is independent of feedback resistor network accuracy.
4
1121.2006.04.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
