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