AAT1121
1.5MHz, 250mA Step-Down Converter
Electrical Characteristics1
VIN = 3.6V, TA = -40°C to +85°C, unless otherwise noted; typical values are TA = 25°C.
Symbol
Description
Conditions
Min
Typ
Max Units
VIN
Input Voltage
2.7
5.5
2.6
V
V
VIN Rising
VUVLO
UVLO Threshold
Hysteresis
250
mV
V
VIN Falling
2.0
IOUT = 0 to 250mA,
VIN = 2.7V to 5.5V
-3.0
3.0
VIN
1.0
%
VOUT
VOUT
IQ
Output Voltage Tolerance2
Output Voltage Range
Quiescent Current
0.6
V
μA
μA
mA
Ω
No Load
30
ISHDN
Shutdown Current
EN = GND
ILIM
P-Channel Current Limit
High-Side Switch On Resistance
Low-Side Switch On Resistance
LX Leakage Current
600
0.59
0.42
RDS(ON)H
RDS(ON)L
ILXLEAK
Ω
VIN = 5.5V, VLX = 0 to VIN
VIN = 2.7V to 5.5V
VIN = 3.6V
1.0
μA
%/V
V
ΔVLinereg/ΔVIN Line Regulation
0.2
VFB
Feedback Threshold Voltage Accuracy
0.597 0.606 0.615
IFB
FB Leakage Current
Oscillator Frequency
VOUT = 1.0V
0.2
1.5
μA
MHz
FOSC
From Enable to Output
Regulation
TS
Startup Time
100
μs
TSD
THYS
VEN(L)
VEN(H)
IEN
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Enable Threshold Low
140
°C
°C
V
15
0.6
1.0
Enable Threshold High
1.4
-1.0
V
Input Low Current
VIN = VEN = 5.5V
μA
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 ]
