AIC1596
3A STEP-DOWN PWM CONVERTER
FEATURES
Operating Input Voltage From 4.5V to 30V
3.3V, 5V, 12V and Adjustable Output Version
Adjustable Version Output Voltage Range,
1.2V to 30V
±
4% max Over Line and Load
Regulation
Available in TO-263-5, TO-220-5 and TO-220B
Package
Requires Only 4 External Components
150KHz Fixed Constant Frequency
Low Power Standby Mode, I
Q
Typically 80µA
TTL Shutdown Capability
Output Overvoltage Protection
Current Limit
Protection
and
Thermal
Shutdown
GENERAL DESCRIPTION
The AIC1596 series are step-down monolithic
PWM converters for delivering 3A at fixed
voltages of 3.3V, 5.0V, 12V and using an
external divider to adjust output voltage from
1.2V to 30V with excellent line and load
regulation.
Switching frequency up to 150KHz is achievable
thus allowing smaller-sized filter components.
Internal current limit and thermal shutdown
circuits provide protection from overloads. It
also provides output overvoltage and short
protection under fault conditions. The internal
precise
reference
combined
with
voltage
feedback loop provides optimum output voltage
accuracy and fast load transient response.
3A Guaranteed Output Load Current
APPLICATIONS
Fixed Voltage power supply for LCD Monitor
and LCD TV
On-Card Switching regulators
Simple High Efficiency Step-down regulator
TYPICAL APPLICATION CIRCUIT
1
V
IN
C1
+
C2
AIC1596
5
4
D1
IN
OUT
2
L1
C3
+
R1
CF
V
OUT
FB
C1: electrolyte capacitor 470uF
C2: No connection
C3: electrolyte capacitor 220uF
CF:refer to table1
D1: SK54
L1:33uH
Analog Integrations Corporation
3A1, No.1 Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
FFO/NO
GND
3
R2
R1 short, R2 and CF open for fixed version
3A Precision PWM DC/DC
DS-1596G-01 092408
1
AIC1596
ORDERING INFORMATION
AIC1596- XXXXXXX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
PACKAGE TYPE
M5: TO-263-5
T5 : TO-220-5
B5 : TO-220B
P: Lead Free Commercial
G: Green Package
OUTPUT VOLTAGE
DEFAULT: Adj.
33: 3.3V
50: 5.0V
12: 12.0V
ORDER NUMBER
AIC1596PM5
AIC1596-33PM5
AIC1596-50PM5
AIC1596-12PM5
PIN CONFIGURATION
TO263-5
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. ON/OFF
TO220-5
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. ON/OFF
12 3 4 5
AIC1596PT5
AIC1596-33PT5
AIC1596-50PT5
AIC1596-12PT5
1 2 3 4 5
AIC1596PB5
AIC1596-33PB5
AIC1596-50PB5
AIC1596-12PB5
TO220B
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. ON/OFF
1 2 3 4 5
Example: AIC1596-50PM5TR
5.0V Output Version, in Lead Free TO-263-5 Package
& Taping & Reel Packing Type
AIC1596-33PB5TR
3.3V Output Version, in Lead Free TO-220B Package
& Taping & Reel Packing Type
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
FB, ON/OFF Pin Input Voltage
Operating Temperature Range
Storage Temperature Range
Junction Temperature
Lead Temperature (Soldering 10s)
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient
(Assume no ambient airflow, no heatsink)
TO-263-5, TO-220-5, TO-220B
TO-263-5
TO-220-5, TO-220B
30V
-0.3V to 30V
-40°C ~ 85°C
–65°C
~ 150°C
125°C
260°C
3°C /W
60°C /W
50°C /W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
2
AIC1596
TEST CIRCUIT
Refer to Typical Application Circuit.
ELECTRICAL CHARACTERISTICS
PARAMETER
Input Voltage
Fixed Output Voltage
TEST CONDITIONS
(T
A
=25°C, V
IN
=12V for the 3.3V, 5V and
°
Adjustable version and V
IN
=24V for the 12V version.) (Note1)
MIN.
4.5
AIC1596-33 (V
IN
> 4.75V)
AIC1596-50 (V
IN
> 7.0V )
AIC1596-12 (V
IN
> 15V )
3.168
4.800
11.52
1.193
1.2
TYP.
MAX.
30
3.432
5.200
12.48
1.267
1.4
4
Internal switch off
ON/OFF= 5V (OFF)
V
FB
=1.3
Vout=-0.9
(Regulator OFF)
(Regulator ON )
130
3.6
120
100
0
Vo=5V , Io=3A
80
150
2.0
0.6
180
6.9
5
80
10
2
10
200
50
30
UNIT
V
V
V
V
V
V
%
mA
µA
nA
mA
V
V
KHz
A
%
%
%
%
FB Reference Voltage
Saturation Voltage
Output Voltage Regulation
Quiescent Current
Shutdown Quiescent Current
FB bias current
Output leakage current
Logic Input High
Logic Input Low
Oscillator Frequency
Output Current Limit
Over Voltage Protection
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
Note 1:
Specifications are production tested at T
A
=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
3
AIC1596
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 approximately -0.5V, with a
duty cycle
of
approximately
V
OUT
/V
IN
.
Ground requires a short, low noise
connection to ensure good load
regulation.
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 2: OUT
PIN 3: GND
PIN 5:
ON / OFF
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.
BLOCK DIAGRAM
SHDN
IN
1.23 V
Reference
FB
Current
Limit
COMP.
AMP.
COMP.
2.6V Regulator
ON / OFF
Compensation
Circuit
Latch
Driver
OUT
150KHz
OSC
Thermal
Shutdown
GND
4
AIC1596
TYPICAL PERFORMANCE CHARACTERISTICS
160
155
4.8
4.6
Switching Frequency (KHz)
150
4.4
Current Limit (A)
-60
-40
-20
0
20
40
60
80
100
120
140
145
140
135
130
125
120
4.2
4.0
3.8
3.6
3.4
-60
-40
-20
0
20
40
60
80
100
120
140
TJ ( C)
o
TJ ( C)
o
Fig.1 Switching frequency vs. Temperature
1.6
1.5
1.4
Fig.2 Current Limit vs. Temperature
1.6
1.5
1.4
Dropout Voltage (vlot)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
-60
-40
-20
0
20
40
60
80
100
120
140
Saturation Voltage (volt)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
-40 C
25 C
100 C
o
o
o
3A
1A
TJ ( C)
o
Switch Current (A)
Fig.3 Dropout voltage vs. Temperature
2.5
Fig.4 Switching saturation voltage vs. switch current
5.0
4.8
ON/OFF threshold voltage (volt)
Minimum Supply Voltage (volt)
2.0
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
V
FB
=1.23V
I
LOAD
=120mA
OFF
1.5
1.0
ON
0.5
0.0
-60
-40
-20
0
20
40
60
80
100
120
140
2.8
-60
-40
-20
0
20
40
60
80
100
120
140
TJ ( C)
o
TJ ( C)
o
Fig.5 ON/OFF threshold voltage vs. Temperature
Fig.6 Minimum Operating supply voltage vs. Temperature
(ADJ only)
5
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