UNISONIC TECHNOLOGIES CO., LTD
P3596
150KHZ, 3A PWM STEP-DOWN
DC/DC CONVERTER
1
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
The UTC
P3596
series is a step-down switching regulator able to
provide
3A
output current. The available output voltages are
1.5V,
2.5V, 3.3V, 5V, 12V, and an adjustable
output version.
TO-220B
FEATURES
*Output load current:
3A
*Adjustable version output voltage range, 1.23V ~ 32V±4%
*Operating voltage can be up to
35V
*Low power standby mode
*High efficiency
*Internal current and thermal limit
1
TO-220-5
1
TO-263-5
*Pb-free plating product number:P3596L
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
P3596-xx-TA5-T
P3596L-xx-TA5-T
P3596-xx-TB5-T
P3596L-xx-TB5-T
P3596-xx-TQ5-R
P3596L-xx-TQ5-R
P3596-xx-TQ5-T
P3596L-xx-TQ5-T
Package
TO-220-5
TO-220B
TO-263-5
TO-263-5
Packing
Tube
Tube
Tape Reel
Tube
Note: xx: Output Voltage, refer to Marking Information.
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Copyright © 2008 Unisonic Technologies Co., Ltd
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QW-R103-023,E
P3596
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
PIN NAME
V
IN
Output
GND
FB (Feedback)
SD (Shutdown)
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
Operating voltage input
Switching output
Circuit Ground
Output voltage feedback control
ON/OFF shutdown
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
15:1.5V
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
TO-220B
TO-220-5
TO-263-5
SYMBOL
θ
JC
RATINGS
3
3
4
45
45
55
UNIT
℃/W
Thermal Resistance Junction to Ambient
θ
JA
℃/W
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QW-R103-023,E
P3596
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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P3596
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
Maximum Supply Voltage
V
CC
40
V
Operating Voltage
V
OPR
4.5 ~ 35
V
ON/OFF Pin Input Voltage
V
ON/OFF
-0.3 ~ +20
V
Feedback Pin Voltage
V
FB
-0.3 ~ +20
V
Output Voltage to Ground (Steady State)
V
OUT
-1
V
Power Dissipation
P
D
Internally limited
mW
Maximum Junction Temperature
T
J
+150
℃
Temperature Range
T
OPR
-40 ~ +125
℃
Storage Temperature Range
T
STG
-65 ~ +150
℃
Note: Absolute maximum ratings are those values beyond 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℃, V
IN
=12V for the 3.3V, 5V, and Adjustable version and V
IN
=24V for the 12V version, I
LOAD
=500mA.)
PARAMETER
1.5V
2.5V
3.3V
5.0V
12V
1.5V
2.5V
3.3V
5.0V
12V
SYMBOL
TEST CONDITIONS
2.8V≦V
IN
≦35V,
0.2A≦I
LOAD
≦3A
3.8V≦V
IN
≦35V,
0.2A≦I
LOAD
≦3A
4.75V≦V
IN
≦35V,
0.2A≦I
LOAD
≦3A
7V≦V
IN
≦35V,
0.2A≦I
LOAD
≦3A
15V≦V
IN
≦35V,
0.2A≦I
LOAD
≦3A
V
IN
=12V, I
LOAD
=3A
V
IN
=12V, I
LOAD
=3A
V
IN
=12V, I
LOAD
=3A
V
IN
=12V, I
LOAD
=3A
V
IN
=24V, I
LOAD
=3A
4.5V≦V
IN
≦35V,
0.2A≦I
LOAD
≦3A
V
OUT
programmed for 3V
V
IN
=12V, V
OUT
=3V, I
LOAD
=3A
Adjustable Version Only, V
FB
=1.3V
(Note 1)
I
OUT
=3A (Note 2, 3)
ON (Note 3)
OFF(Note 4)
Peak Current (Notes 2, 3)
Output=0V (Notes 2, 4)
Output=-1V, V
IN
= 40V
(Note 4)
ON/OFF pin=5V (OFF), V
IN
= 40V
MIN
1.44
2.4
3.168
4.8
11.52
TYP
1.5
2.5
3.3
5.0
12.0
73
73
73
80
90
MAX
1.56
2.6
3.432
5.2
12.48
UNIT
V
V
V
V
V
%
%
%
%
%
V
%
50
173
1.4
nA
kHz
V
%
6.9
50
30
10
200
A
µA
mA
mA
µA
V
µA
µA
Output Voltage
V
OUT
Efficiency
η
UTC P3596-ADJ
Feedback Voltage
Efficiency
ALL OUTPUT VOLTAGE
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Duty Cycle
Current Limit
Output Leakage Current
Quiescent Current
Standby Quiescent Current
ON/OFF CONTROL
ON/OFF Pin Logic Input
Low
Threshold Voltage
High
Min
Max
V
FB
η
I
BIAS
f
OSC
V
SAT
DC
I
LIMIT
I
LEAK
I
Q
I
STBY
1.193 1.230
73
10
150
1.16
100
0
4.5
2
5
80
1.267
127
3.6
V
IH
Regulator ON
0.6
1.3
V
IL
Regulator OFF
2.0
I
H
V
LOGIC
=2.5V (Regulator OFF)
5
15
ON/OFF Pin Input Current
I
L
V
LOGIC
=0.5V (Regulator ON)
0.02
5
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 15V for the 12V version, and 12V for others to
the output transistor switch OFF.
force
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QW-R103-023,E
P3596
TYPICAL APPLICATION
For Fixed Versions
LINEAR INTEGRATED CIRCUIT
Note: The DC input would be 15V for 12V version.
For Adjustable Version
C
FF
R1
1k
+
UNREGULATED
DC INPUT
LOCATE THE PROGRAMMING RESISTORS NEAR
THE FEEDBACK PIN USING SHORT LEADS
KEEP FEEDBACK WIRING AWAY
FROM INDUCTOR FLUX
OUTPUT
REGULATED OUTPUT
L1
D1
+
L
O
C
OUT
A
D
R2
4
FB
+V
IN
1
+
UTC P3596-
ADJ
C
IN
3
GND
5
2
ON/OFF
HEAVY LINES MUST BE KEPT SHORT AND USE
GROUND PLANE CONSTRUCTION FOR BEST RESULTS
Where V
REF
= 1.23V
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QW-R103-023,E
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