PRODUCT DATASHEET
AAT1
189
SwitchReg
TM
Electrical Characteristics
1
V
IN
= 12V; T
A
= -40°C to 85°C, unless noted otherwise. Typical values are at T
A
= 25°C.
Symbol
V
IN
V
UVLO
V
OUT
V
FB
ΔV
LINEREG
/
ΔV
IN
ΔV
LOADREG
/
ΔI
IN
I
Q
I
SHDN
V
OCP
I
LX
D
MAX
T
ON(MIN)
R
DSON(H)
F
OSC
F
FOLDBACK
T
SS
T
SD
V
EN(L)
V
EN(H)
I
EN
High Voltage Step-Down Regulator
Description
Input Voltage
UVLO Threshold
Output Voltage Range
Output Voltage Accuracy
Feedback Pin Voltage
Line Regulation
Load Regulation
Quiescent Current
Shutdown Current
Over-Current Offset Voltage
LX Pin Leakage Current
Maximum Duty Cycle
Minimum On-Time
Hi Side On-Resistance
Oscillator Frequency
Short Circuit Foldback Frequency
Soft-Start Time
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Enable Threshold Low
Enable Threshold High
Input Low Current
Conditions
V
IN
Rising
V
IN
Hysteresis
V
IN
Falling
I
OUT
= 0A to 2.5A
V
IN
= 6V to 24V, V
OUT
= 3.3V, I
OUT
= 2.5A
V
IN
= 6V to 24V, V
OUT
= 5.0V, I
OUT
= 2.5A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A to 2.5A
V
IN
= 12V, V
OUT
= 5V, I
OUT
= 0A to 2.5A
V
EN
= High, No load
V
EN
= Low, V
L
= 0V
V
EN
= High, V
IN
= 6.0V to 24.0V, T
A
= 25°C
V
IN
= 24.0V, V
EN
= Low
V
IN
= 6.0 to 24.0V
V
L
= 4.5V
Min
6.0
Typ
Max
24.0
5.0
Units
V
V
mV
V
V
%
V
%/V
%/A
300
3.0
1.5
-2.5
0.591
5.5
2.5
0.609
0.600
0.028
0.17
0.064
0.08
0.6
100
85
100
70
490
100
2.5
135
15
80
-1.0
35.0
120
1.0
350
Current Limit Triggered
From Enable to Output Regulation
650
0.6
2.5
-1.0
1.0
mA
μA
mV
μA
%
ns
mΩ
kHz
kHz
ms
°C
°C
V
V
μA
1. The AAT1189 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.
4
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1189.2008.06.1.0
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