AIC1596
3A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1596-P1 03/23/00
ELECTRICAL CHARACTERISTICS (T =25°C, V =18V)
J
IN
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX. UNIT
Input Voltage
4.5
36
V
V
Fixed Output Voltage
AIC1596-25 (V > 4.5V)
2.5
3.3
IN
AIC1596-33 (V > 4.5V)
V
IN
AIC1596-50 (V > 7.0V )
5.0
V
IN
AIC1596-12 (V > 15V )
12.0
1.25
V
IN
Feedback Voltage
AIC1596 Adjustable
V
Output Voltage Regulation
Quiescent Current
4
5
%
mA
µA
V
Internal switch off
1
Shutdown Quiescent Current
Logic Input High
SHDN = 5V (OFF)
(Regulator OFF)
(Regulator ON )
AIC1596A series
AIC1596B series
80
2
Logic Input Low
0.8
V
Oscillator Frequency
Oscillator Frequency
Output Current Limit
Over Voltage Protection
Maximum Duty Cycle
Efficiency
150
300
KHz
A
3.0
120
90
%
100
%
Vo=5V , Io=3A
%
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.
PIN 4: FB
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 2:OUT
Internal switch. The voltage at this pin
switches between (V -V
) and ap-
IN SAT
proximately –0.5V, with a duty cycle of
approximately V /V .
OUT IN
PIN 3: GND Ground requires a short, low noise
connection to ensure good load
regulation.
ꢀ
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
3
AIC [ ANALOG INTERGRATIONS CORPORATION ]
