AIC1596
3A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1596-P1 03/23/00
ELECTRICAL CHARACTERISTICS
(T
J
=25°C, V
IN
=18V)
°
PARAMETER
Input Voltage
Fixed Output Voltage
AIC1596-25 (V
IN
> 4.5V)
AIC1596-33 (V
IN
> 4.5V)
AIC1596-50 (V
IN
> 7.0V )
AIC1596-12 (V
IN
> 15V )
Feedback Voltage
Output Voltage Regulation
Quiescent Current
Shutdown Quiescent Current
Logic Input High
Logic Input Low
Oscillator Frequency
Oscillator Frequency
Output Current Limit
Over Voltage Protection
Maximum Duty Cycle
Efficiency
Vo=5V , Io=3A
100
90
Internal switch off
SHDN = 5V (OFF)
(Regulator OFF)
(Regulator ON )
AIC1596A series
AIC1596B series
3.0
120
150
300
KHz
A
%
%
%
2
0.8
1
80
AIC1596 Adjustable
TEST CONDITIONS
MIN.
4.5
TYP.
MAX.
36
UNIT
V
V
V
V
V
V
2.5
3.3
5.0
12.0
1.25
4
5
%
mA
µA
V
V
!
PIN DESCRIPTIONS
PIN 1: IN
Supply voltage input for the IC
switching regulator. A suitable input
bypass capacitor must be present at
this pin to minimize voltage transients
and to supply the switching currents
needed by the regulator.
Internal switch. The voltage at this pin
switches between (V
IN
-V
SAT
) and ap-
proximately –0.5V, with a duty cycle of
approximately V
OUT
/V
IN
.
Ground requires a short, low noise
connection to ensure good load
regulation.
Feedback input for fixed-output or
adjustable-output version. Connect di-
rectly to output for fixed operation
version or to a resistor divider for ad-
justable operation versions.
PIN 5: SHDN Allows the switching regulator circuit
to be shutdown using logic level sig-
nals thus dropping the total input sup-
ply current to approximately 80µA.
Drive it high to disable the reference,
control circuitry and internal switches.
Drive low or connect to GND for nor-
mal operation.
PIN 4: FB
PIN 2:OUT
PIN 3: GND
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
3
AIC [ ANALOG INTERGRATIONS CORPORATION ]
