AMS2576
All Output Voltage Version
(Vin=12V for 5V, 3.3V and Adjustable version, Vin=25V for 12V version, I
L
= 500mA)
Oscillator Frequency (Note 2)
Quiescent Current (Note 3)
Standby Current
Saturation Voltage (Note 4)
Feedback Bias Current
Duty Cycle (Note 5)
Current Limit (Note 2)(Note 4)
Output Leakage Current (Note 3)
V
OUT
=0V
V
OUT
=-1V
V
IH
(V
OUT
=0V)
V
IL
(V
OUT
=Normal Output Voltage)
I
IH
(ENABLE =5V)
I
IH
(ENABLE =0V)
ENABLE =5V
I
LOAD
=3A
V
OUT
=5V (Adj. Version only)
Operating (ON)
47
--
--
--
--
93
4.2
--
--
2.2
--
--
--
52
5
80
1.2
10
98
7.0
0.3
7.5
1.4
1.2
12
0
58
10
250
1.5
100
--
8.8
2
30
--
1.0
30
10
kHz
mA
uA
V
nA
%
A
mA
ENABLE Threshold Voltage
V
ENABLE Input Current
uA
Note 1:
External components such as the catch diode, inductor, input and output capacitors can affect
switching regulator system performance. Refer to Application information for details.
Note 2:
The oscillator frequency reduces to approximately 11KHz in the event of fault conditions, such
as output short or overload. And the regulated output voltage will drop approximately 40% from
the nominal output voltage. This self-protection feature lowers the average power dissipation by
lowering the minimum duty cycle from 5% down to approximately 2%.
Note 3:
For these parameters, FB is removed from VOUT and connected to +12V to force the output
transistor OFF.
Note 4:
VOUT pin sourcing current. No diode, inductor or capacitor connected to VOUT.
Note 5:
FB is removed from VOUT and connected to 0V.
4
Advanced Monolithic Systems
http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
