PRODUCT DATASHEET
AAT1145
SwitchReg
TM
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
OUT
I
Q
I
FB
V
FB
ΔV
LINEREG
/
ΔV
IN
ΔV
LOADREG
/
ΔI
OUT
V
FB
V
OUT
F
OSC
T
S
T
SD
T
HYS
I
LIM
R
DS(ON)
V
EN(L)
V
EN(H)
I
EN
1.2A Step-Down Converter
Description
Input Voltage Range
2
Output Voltage Range
Input DC Supply Active Mode
Current
Shutdown Mode
Feedback Input Bias Current
Regulated Feedback Voltage
Line Regulation
Load Regulation
Output Voltage Accuracy
Oscillator Frequency
Startup Time
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Peak Switch Current
P-CH MOSFET
N-CH MOSFET
Enable Threshold Low
Enable Threshold High
Input Low Current
3
Conditions
Min
2.5
0.6
Typ
Max
5.5
V
IN
500
1
30
0.6120
0.6135
0.6150
0.20
Units
V
V
μA
μA
nA
V
%/V
%/A
V
FB
= 0.5V
V
EN
= 0V, V
AIN
= 5.5V
V
FB
= 0.65V
T
A
= 25°C
T
A
= 0°C
≤
T
A
≤
85°C
T
A
= -40°C
≤
T
A
≤
85°C
V
IN
= 2.5V to 5.5V, I
OUT
= 10mA
I
OUT
= 10mA to 1200mA
V
IN
= 2.5 to 4.2V, I
OUT
= 10 to 1200mA
V
FB
= 0.6V
From Enable to Output Regulation
300
0.1
0.5880
0.5865
0.5850
0.6000
0.6000
0.6000
0.10
0.50
-3
1.2
1.5
1.3
170
10
+3
1.8
%
MHz
ms
°C
°C
A
V
IN
= 3.6V
V
IN
= 3.6V
1.5
-1.0
2.5
135
95
200
150
0.3
1.0
mΩ
V
V
μA
V
IN
= V
EN
= 5.5V
1. The AAT1145 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
2. V
IN
should be not less than V
OUT
+ V
DROPOUT
, where V
DROPOUT
= I
OUT
· (R
DS(ON)PMOS
+ ESR
INDUCTOR
), typically V
DROPOUT
= 0.3V.
3. The regulated feedback voltage is tested in an internal test mode that connects V
FB
to the output of the error amplifier.
4
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1145.2007.11.1.1
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