UNISONIC TECHNOLOGIES CO., LTD
P1596
150KHZ, 1.5A PWM BUCK DC/DC
CONVERTER
1
1
LINEAR INTEGRATED CIRCUIT
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 and an adjustable output version.
TO-220B-5
TO-220-5
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 22V
*Low power standby mode
*High efficiency
*Internal current and thermal limit
*Built-in switching transistor on chip
1
1
TO-263-5
TO-252-5
1
SIP-4
*Pb-free plating product number: P1596L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
P1596-xx-G04-K
P1596L-xx-G04-K
P1596-xx-TA5-T
P1596L-xx-TA5-T
P1596-xx-TB5-T
P1596L-xx-TB5-T
P1596-xx-TN5-R
P1596L-xx-TN5-R
P1596-xx-TN5-T
P1596L-xx-TN5-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.
P1596L-xx-G04-K
Package
SIP-4
TO-220-5
TO-220B
TO-252-5
TO-252-5
TO-263-5
TO-263-5
Packing
Bulk
Tube
Tube
Tape Reel
Tube
Tape Reel
Tube
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Lead Plating
(1) K: Bulk, R: Tape Reel, T:Tube
(2) G04: SIP-4, TA5: TO-220-5, TB5: TO-220B,
TN 5: TO-252-5, TQ5: TO-263-5
(3) xx: refer to Marking Information
(4) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 8
QW-R103-027,B
P1596
BLOCK DIAGRAM
ON / OFF
LINEAR INTEGRATED CIRCUIT
V
IN
220mV
220mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
Start
up
+
Comp
-
-
Comp
+
FB
+
Amp
-
Frequency
Compe-
nsation
-
Comp
+
Pre-driver
1.5A
Switch
OUTPUT
200kHz
OSC.
Thermal
Shutdown
GND
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QW-R103-027,B
P1596
PIN DESCRIPTIONS
FOR 5-PIN
1
2
3
4
5
FOR 4-PIN
1
2
4
3
-
PIN NAME
V
IN
Output
GND
FB (Feedback)
SD (Shutdown)
LINEAR INTEGRATED CIRCUIT
DESCRITION
Operating voltage input
Switching output
Circuit Ground
Output voltage feedback control
ON/OFF shutdown
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
UTC
P1596
Lead Plating
Date Code
1 2 3 4
SIP-4
25:2.5V
33:3.3V
50:5.0V
AD:ADJ
Voltage Code
TO-220-5
TO-220B
TO-252-5
TO-263-5
UTC
P1596
Voltage Code
1 2 3 4 5
Lead Plating
Date Code
THERMAL DATA
PARAMETER
SIP-4
TO-220B
TO-220-5
TO-252-5
TO-263-5
SYMBOL
RATINGS
30
3
3
8
4
UNIT
Thermal Resistance Junction to Case
θ
JC
℃/W
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QW-R103-027,B
P1596
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
Maximum Supply Voltage
V
CC
24
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
℃
Temperature Range
T
OPR
-40 ~ +125
℃
Storage Temperature Range
T
STG
-65 ~ +150
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℃, V
IN
=12V for 2.5V, 3.3V, 5V, ADJ and V
IN
=18V for the 12V, I
LOAD
=0.5A, unless otherwise specified.)
PARAMETER
Output Voltage
2.5V
3.3V
5.0V
2.5V
3.3V
5.0V
SYMBOL
V
OUT
TEST CONDITIONS
3.8V≦V
IN
≦22V,
0.2A≦I
LOAD
≦1.5A
4.75V≦V
IN
≦22V,
0.2A≦I
LOAD
≦1.5A
7V≦V
IN
≦22V,
0.2A≦I
LOAD
≦1.5A
V
IN
=12V, I
LOAD
=1.5A
V
IN
=12V, I
LOAD
=1.5A
V
IN
=12V, I
LOAD
=1.5A
4.75V≦V
IN
≦22V,
0.2A≦I
LOAD
≦1.5A
V
OUT
Programmed for 3V
V
IN
=12V, I
LOAD
=1.5A
Adjustable Version Only, V
FB
=1.3V
127
I
OUT
=1.5A, No outside circuit
V
FB
=0V force driver on
V
FB
=0V force driver on
V
FB
=12V force driver off
Peak Current, No outside circuit
V
FB
=0V force driver on
Output=0V, No outside circuit
V
FB
=12V force driver off
Output=-1V, V
IN
=12V
V
FB
=12V force driver off
ON/OFF Pin=5V, V
IN
=22V
2
-200
-5
5
70
10
150
1.193
MIN
2.4
3.168
4.8
TYP
2.5
3.3
5.0
73
73
80
1.23
78
-10
150
1.25
100
0
-50
173
1.4
MAX UNIT
2.6
V
3.432
V
5.2
V
%
%
%
1.267
V
%
nA
KHz
V
%
A
µA
mA
mA
µA
Efficiency
UTC P1596-ADJ
Output Feedback
Efficiency
η
V
FB
η
I
BIAS
f
OSC
V
SAT
Max
Min
DC
I
LIMIT
I
LEAK
I
Q
I
STBY
ALL OUTPUT VOLTAGE
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Duty Cycle
Current Limit
Output Leakage Current
Quiescent Current
Standby Quiescent Current
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QW-R103-027,B
P1596
TYPICAL APPLICATION
FOR ADJUSTABLE OUTPUT VOLTAGE VERSION
For 5 PIN:
C
FF
R1
R2
LINEAR INTEGRATED CIRCUIT
Locate The Programming Resistors Near
The Feedback Pin Using Short Leads
Keep Feedback Wiring
Away From Inductor Flux
OUTPUT
1k
+
Unregulated
DC Input
+V
IN
4
Feedback
UTC P1596 -ADJ
Regulated Output
L1
D1
1
+
C
IN
2
3
GND
5
ON/OFF
+
C
OUT
L
O
A
D
Heavy Lines Must be Kept Short and Use
Ground Plane Construction for Best Results
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
=R1((V
OUT
/ V
REF
)-1)
For 4 PIN:
R
1
R
2
FB
12V
DC Input
V
IN
+
C
IN
Capacitor
1
3
UTC
P1596 -XX
4
GND
2
OUTPUT
L
1
3.3V/1.5A
Output Load
Inductor
+
D
1
Schottky Diode
Co
Capacitor
V
OUT
=V
FB
×(1+R
1
/R
2
)
V
FB
=1.23V
R
2
=1K~3K
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QW-R103-027,B
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