AIC AIC1595B-33CT 2a step-down pwm regulator Datasheet

AIC1595
ADVANCED INFORMATION
2A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1595-P1 03/23/00
! DESCRIPTION
! FEATURES
"
"
"
"
"
"
"
"
"
"
"
Operating Input Voltage From 4.5V to 36V
2.5V, 3.3V, 5V , 12V and Adjustable Output Version
Adjustable Version Output Voltage Range , 1.25V
to 30V ± 4% max Over Line and Load Regulation
Available in TO220-5 and TO263-5 Package
Requires Only 4 External Components.
150KHz/300KHz Fixed Constant Frequency
The AIC1595 series are step-down monolithic
PWM regulators delivering 2A at fixed voltages of
2.5V , 3.3V, 5.0V , 12V and using a external divider to adjust output voltage from 1.25V to 30V
with excellent line and load regulation.
Switching frequency up to 150KHz/300KHz are
achievable thus allowing smaller sized filter com-
Low Power Standby Mode, IQ Typically 80µA
TTL Shutdown Capability.
Output Overvoltage Protection
Current Limit and Thermal Shutdown Protection.
2A Guaranteed Output Current
ponents. Internal current limit and thermal shutdown circuits provide protection from overloads. It
also provides output overvoltage and short protection under fault conditions.
The internal precious reference combined with
voltage feedback loop provides optimum output
! APPLICATIONS
"
"
"
voltage accuracy and fast load transient response.
Simple High Efficiency Step-down regulator
On-Card Switching regulators
Fixed Voltage power supply for LCD Monitor
Packages available are in standard TO220-5 for
standard assembly and TO263-5 for SMD.
! TYPICAL APPLICATION CIRCUIT
1
VIN
+
OUT
IN
2
L1
C2
C1
AIC1595
SHDN
D1
+
VOUT
C3
4
FB
R1
GND
R2
R1 short and R2 open for fixed
switching output version
2A Precision PWM DC/DC Regulator
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
1
AIC1595
2A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1595-P1 03/23/00
! ORDERING INFORMATION
XXCX
AIC1595X
PIN CONFIGURATION
ORDER NUMBER
PACKAGE TYPE
M: TO263-5
T: TO220-5
OUTPUT VOLTAGE
DEFAULT: Adj.
25: 2.5V
33: 3.3V
50: 5.0V
12: 12.0V
FREQUENCY VERSION
A: 150KHZ
B: 300KHZ
AIC1595A(B)CM
AIC1595A(B)-25CM
AIC1595A(B)-33CM
AIC1595A(B)-50CM
AIC1595A(B)-12CM
(TO263-5)
AIC1595A(B)CT
AIC1595A(B)-25CT
AIC1595A(B)-33CT
AIC1595A(B)-50CT
AIC1595A(B)-12CT
(TO220-5)
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. SHDN
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5.SHDN
1 2 3 4 5
1 2 3 4 5
! ABSOLUTE MAXIMUM RATINGS
Supply Voltage ……………..……………......……………..........……………….................36V
FB, SHDN Pin Input Voltage .……………......……………..........……………….................25V
Operating Temperature Range …….…………...............…….……………......... 0°C ~ 70°C
Storage Temperature Range ……...................……..…….…………………. –65°C ~ 150°C
! TEST CIRCUIT
Refer to Typical Application Circuit.
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
2
AIC1595
2A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1595-P1 03/23/00
! ELECTRICAL CHARACTERISTICS (TJ=25°°C, VIN=18V)
PARAMETER
TEST CONDITIONS
Input Voltage
Fixed Output Voltage
Feedback Voltage
MIN.
TYP.
4.5
UNIT
36
V
AIC1595-25 (VIN > 4.5V)
2.5
V
AIC1595-33 (VIN > 4.5V)
3.3
V
AIC1595-50 (VIN > 7.0V )
5.0
V
AIC1595-12 (VIN > 15V )
12.0
V
AIC1595 Adjustable
1.25
V
Output Voltage Regulation
Quiescent Current
Internal switch off
1
Shutdown Quiescent Current
SHDN = 5V (OFF)
80
Logic Input High
(Regulator OFF)
Logic Input Low
(Regulator ON )
Oscillator Frequency
AIC1595A series
150
Oscillator Frequency
AIC1595B series
300
Output Current Limit
4
%
5
mA
µA
2
V
0.8
2.0
Over Voltage Protection
100
Vo=5V , Io=2A
V
KHz
A
120
Maximum Duty Cycle
Efficiency
MAX.
%
%
90
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
AIC1595
2A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1595-P1 03/23/00
! PIN DESCRIPTIONS
PIN 1: IN
PIN 2:OUT
PIN 3: GND
!
PIN 4: FB
Feedback input for fixed-output or
adjustable-output version. Connect directly to output for fixed operation
version or to a resistor divider for adjustable operation versions.
PIN 5: SHDN Allows the switching regulator circuit
to be shutdown using logic level signals thus dropping the total input supply current to approximately 80µA.
Drive it high to disable the reference ,
control circuitry and internal switches.
Drive low or connect to GND for normal operation.
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 (VIN-VSAT) and approximately –0.5V, with a duty cycle of
approximately VOUT/VIN.
Ground requires a short, low noise
connection to ensure good load
regulation.
BLOCK DIAGRAM
SHDN
IN
1.25 V
Reference
2.5V Regulator
ON / OFF
FB
Current
Limit
COMP.
AMP.
COMP.
Latch
Compensation
Driver
Circuit
OUT
150/300
Thermal
KHz OSC
Shutdown
GND
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
4
AIC1595
2A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1595-P1 03/23/00
!
PHYSICAL DIMENSIONS
"
TO-263-5L (unit: mm)
E
A
L2
D
L
L1
B
"
e
C
SYMBOL
MIN
MAX
A
4.07
4.83
B
1.45
1.96
C
0.36
0.64
C2
1.14
1.40
D
8.63
9.66
E
9.78
10.54
E
0.71
1.02
L
15.11
15.59
L1
2.28
2.80
L2
-
1.40
TO-220-5 (unit: mm)
A
E
F
H1
D
L
e
e2
J1
SYMBOL
MIN
MAX
A
4.06
4.83
D
8.35
8.89
E
9.78
10.54
e
1.57
1.85
e1
0.76
1.02
e2
0.33
0.64
F
1.14
1.40
H1
5.46
6.86
J1
2.29
3.18
L
13.21
14.73
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
5
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