UNISONIC TECHNOLOGIES CO., LTD
P1596
150KHZ, 1.5A PWM BUCK
DC/DC CONVERTER
DESCRIPTION
The UTC
P1596
series is a step-down switching regulator able to
provide 1.5A output current. The available output voltages are 2.5V,
3.3V, 5V, 12V and an adjustable output version.
LINEAR INTEGRATED CIRCUIT
FEATURES
* Output load current: 1.5A
* Adjustable version output voltage range, 1.23V ~ 18V±4%
* 150KHz
±15%
fixed switching frequency
* Voltage mode non-synchronous PWM control
* Thermal-shutdown and current-limit protection
* Operating voltage can be up to 24V
* Low power standby mode
* High efficiency
* Internal current and thermal limit
* Built-in switching transistor on chip
*Pb-free plating product number: P1596L
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
P1596-xx-TA5-T
P1596L-xx-TA5-T
P1596-xx-TB5-T
P1596L-xx-TB5-T
P1596-xx-TQ5-R
P1596L-xx-TQ5-R
P1596-xx-TQ5-T
P1596L-xx-TQ5-T
Note: xx: Output Voltage, refer to Marking Information.
Package
TO-220-5
TO-220B
TO-263-5
TO-263-5
Packing
Tube
Tube
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2008 Unisonic Technologies Co., Ltd
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QW-R103-027,H
P1596
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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QW-R103-027,H
P1596
PIN DESCRIPTIONS
PIN NO.
1
2
3
4
5
PIN NAME
V
IN
Output
GND
FB (Feedback)
SD (Shutdown)
DESCRITION
Operating voltage input
Switching output
Circuit Ground
Output voltage feedback control
ON/OFF shutdown
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
25:2.5V
33:3.3V
50:5.0V
12:12V
AD:ADJ
MARKING
TO-220-5
TO-220B
TO-263-5
THERMAL DATA
PARAMETER
Thermal Resistance Junction to Case
TO-220B
TO-220-5
TO-263-5
SYMBOL
θ
JC
RATINGS
3
3
4
UNIT
°С/W
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P1596
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
Maximum Supply Voltage
V
CC
28
V
Operating Voltage
V
OPR
4.5 ~ 22
V
ON/OFF Pin Input Voltage
V
ON/OFF
-0.3 ~ +18
V
Feedback Pin Voltage
V
FB
-0.3 ~ +18
V
Output Voltage to Ground (Steady State)
V
OUT
-1
V
Power Dissipation
P
D
Internally limited
W
Operating Temperature
T
OPR
-40 ~ +125
°С
Storage Temperature
T
STG
-65 ~ +150
°С
Note Absolute maximum ratings are those values beyond which the device which the device could be permanently
damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS
(T
J
=25°С, V
IN
=12V for the 2.5V 3.3V, 5V, and Adjustable version and V
IN
=24V for the 12V version, I
LOAD
=500mA.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
2.5V
3.8V≦V
IN
≦24V,
0.2A≦I
LOAD
≦1.5A
2.4
2.5
2.6
V
3.3V
4.75V≦V
IN
≦24V,
0.2A≦I
LOAD
≦1.5A
3.168 3.3 3.432
V
Output Voltage
V
OUT
5.0V
7V≦V
IN
≦24V,
0.2A≦I
LOAD
≦1.5A
4.8
5.0
5.2
V
12V
15V≦V
IN
≦24V,
0.2A≦I
LOAD
≦1.5A
11.52
12
12.48
V
2.5V
V
IN
=12V, I
LOAD
=1.5A
73
%
3.3V
V
IN
=12V, I
LOAD
=1.5A
73
%
Efficiency
η
5.0V
V
IN
=12V, I
LOAD
=1.5A
80
%
12V
V
IN
=24V, I
LOAD
=1.5A
72
%
UTC P1596-ADJ
4.75V≦V
IN
≦24V,
0.2A≦I
LOAD
≦1.5A
1.193 1.23 1.267
V
Output Feedback
V
FB
V
OUT
Programmed for 3V
Efficiency
ALL OUTPUT VOLTAGE
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Min Duty Cycle (OFF)
Current Limit
η
I
BIAS
f
OSC
V
SAT
DC
I
CL
V
IN
=12V, I
LOAD
=1.5A
Adjustable Version Only, V
FB
=1.3V
(Note 1)
I
OUT
=2A (Note 2, 3)
(Note 3)
(Note 4)
78
-10
150
1.25
100
0
2.25
-50
173
1.4
%
nA
KHz
V
%
127
Peak Current (Notes 2, 3)
1.8
3.45
A
Output=0V (Notes 2, 4)
-200
μA
Output Leakage Current
I
L
Output=-1V (Note 5)
-5
mA
Quiescent Current
I
Q
(Note 4)
5
10
mA
Standby Quiescent Current
I
STBY
ON/OFF Pin=5V (OFF) (Note 5)
70
150
μA
Note 1: The switching frequency is reduced when the second stage current limit is activated.
2: No diode, inductor or capacitor connected to output pin.
3: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
4: Feedback pin removed from output and connected to 12V for the 2.5V 3.3V, 5V, and the ADJ. version, and
15V for the 12V version, to force the output transistor switch OFF.
5: V
IN
= 24V
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P1596
TYPICAL APPLICATION
FOR ADJUSTABLE OUTPUT VOLTAGE VERSION
LINEAR INTEGRATED CIRCUIT
V
OUT
×(R
1
/(R
1
+ R
2
))=V
REF
V
OUT
= V
REF
(1+ R
2
/R
1
)
Where V
REF
=1.23V
R
2
=R
1
((V
OUT
/ V
REF
)-1)
FOR FIXED OUTPUT VOLTAGE VERSIONS
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