AT1799
2A Step-Down Voltage Regulator
Electrical Characteristics
(IN=12V, EN=5V, Ta=+25℃, unless otherwise noted)
Parameter
Input operating voltage
Input under-voltage lockout
threshold
UVLO hysteresis
Quiescent Current
Shutdown Current
Oscillator Frequency
Short-Circuit Frequency
Feedback Regulation voltage
FB Input Bias Current
Current limit
Maximum Duty Cycle
Minimum Duty Cycle
SW Switch On-Resistance
SW Leakage Current
Load Regulation
Line Regulation
Error Amplifier Voltage Gain
Error Amplifier Trans-conductance
Soft-Start Time
EN Threshold Voltage
EN Pull Up Current
Thermal Shutdown
Symbol
IN
V
UVLO
Test Condition
IN Rising
Min.
4.75
3.8
-
Typ.
12
4.2
500
3.5
20
380
42
Max. Units
16
4.6
-
-
50
440
-
V
V
mV
mA
uA
KHz
KHz
V
nA
A
%
%
mΩ
µA
%
-
-
%/V
dB
Iin
I
SHDN
f
SW
V
FB
I
FB
D
MAIN
D
MIIN
R
SW-DS(ON)
I
SW
V
FB
=1.5V
EN =GND
Ta=+25℃
FB=0V
Ta=+25℃
V
FB
=1.215V
FB=1.0V
FB=1.5V
I
SW
=2A
IN=13.5V,V
SW
=GND
, EN=0V
0 A<I
SW
< 2A
4.75V < IN<16V
-
-
-
-
1.20
-50
2.5
-
0
-
-
1.215 1.233
-
2.75
-
-
100
0.1
0.2
50
-
100
-
130
20
-
-
500
-
1.0
70
800
10
1
1
160
1000
µA/V
-
-
-
-
ms
V
µA
℃
Hysteresis 150mV
EN=0V
-
-
-
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
8/23/2006 REV:1.1
Email:
service@aimtron.com.tw
4
AIMTRON [ AIMTRON TECHNOLOGY ]
