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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 ~ 18V4% *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
www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., Ltd
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P1596
BLOCK DIAGRAM
ON / OFF
LINEAR INTEGRATED CIRCUIT
VIN
220mV 220mV
Current Source bias
1.235V Reference
2.5V Regulator
Start up
+ Comp Comp +
FB
+ Amp -
Frequency Compensation
Comp +
Pre-driver
1.5A Switch OUTPUT
200kHz OSC.
Thermal Shutdown
GND
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P1596
PIN DESCRIPTIONS
FOR 5-PIN 1 2 3 4 5 FOR 4-PIN 1 2 4 3 PIN NAME VIN 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 1234
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 12345
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
JC
/W
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ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER SYMBOL RATINGS UNIT Maximum Supply Voltage VCC 24 V Operating Voltage VOPR 4.5 ~ 22 V ON/OFF Pin Input Voltage VON/OFF -0.3 ~ +18 V Feedback Pin Voltage VFB -0.3 ~ +18 V Output Voltage to Ground (Steady State) VOUT -1 V Power Dissipation PD Internally limited W Temperature Range TOPR -40 ~ +125 Storage Temperature Range TSTG -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
(TJ=25, VIN=12V for 2.5V, 3.3V, 5V, ADJ and VIN=18V for the 12V, ILOAD=0.5A, unless otherwise specified.) PARAMETER Output Voltage 2.5V 3.3V 5.0V 2.5V 3.3V 5.0V SYMBOL VOUT TEST CONDITIONS 3.8VVIN22V, 0.2AILOAD1.5A 4.75VVIN22V, 0.2AILOAD1.5A 7VVIN22V, 0.2AILOAD1.5A VIN=12V, ILOAD=1.5A VIN=12V, ILOAD=1.5A VIN=12V, ILOAD=1.5A 4.75VVIN22V, 0.2AILOAD1.5A VOUT Programmed for 3V VIN=12V, ILOAD=1.5A Adjustable Version Only, VFB=1.3V 127 IOUT=1.5A, No outside circuit VFB=0V force driver on VFB=0V force driver on VFB=12V force driver off Peak Current, No outside circuit VFB=0V force driver on Output=0V, No outside circuit VFB=12V force driver off Output=-1V, VIN=12V VFB=12V force driver off ON/OFF Pin=5V, VIN=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 A mA mA A
Efficiency UTC P1596-ADJ Output Feedback Efficiency
VFB IBIAS fOSC VSAT Max Min DC ILIMIT ILEAK IQ ISTBY
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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P1596
TYPICAL APPLICATION
FOR ADJUSTABLE OUTPUT VOLTAGE VERSION For 5 PIN:
CFF 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 +
CIN
2 3
GND
5 ON/OFF
+ COUT
L O A D
Heavy Lines Must be Kept Short and Use Ground Plane Construction for Best Results
VOUTx(R1/(R1+ R2))=VREF VOUT = VREF(1+ R2/R1) Where VREF=1.23V R2=R1((VOUT / VREF)-1)
For 4 PIN:
R1 R2
FB
12V DC Input VIN + CIN Capacitor 1
3 UTC P1596 -XX 4
GND
2
OUTPUT
L1
3.3V/1.5A Output Load
Inductor + D1 Schottky Diode Co Capacitor
VOUT=VFBx(1+R1/R2) VFB=1.23V R2=1K~3K
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P1596
TYPICAL APPLICATION
FOR FIXED OUTPUT VOLTAGE VERSIONS For 5 PIN:
LINEAR INTEGRATED CIRCUIT
FB
12V DC Input VIN + CIN Capacitor 1
4 UTC P1596 -XX 3
GND
2
OUTPUT
L1
3.3V/1.5A Output Load
Inductor + D1 Schottky Diode Co Capacitor
5
SD
For 4 PIN:
FB
12V DC Input VIN + CIN Capacitor 1
3 UTC P1596 -XX 4
GND
2
OUTPUT
L1
3.3V/1.5A Output Load
Inductor + D1 Schottky Diode Co Capacitor
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TYPICAL CHARACTERISTICS
Output Voltage v.s. Temperature (VIN=12V, IOUT=1.5A)
3.4 3.35 3.3
LINEAR INTEGRATED CIRCUIT
Efficiency v.s. Temperature (VIN=12V, VOUT=3.3V, IOUT=1.5A)
82 81 80
VOUT (V)
3.25 3.2 3.15 3.1 3.05 3 -40 -20 0 20 40 60 80 100 120 140
Efficiency (%)
79 78 77 76 75 74 -50 -30 -10 10 30 50 70 90 110 130
Temperature, Ta ()
Temperature, Ta ()
Saturation Voltage v.s. Temperature (VCC=12V, VFB=0V, VSD=0)
1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 -50 -25 0 25 50 75 100 125 2 0.5A 1A 1.5A 3.5
Switch Current Limit v.s. Temperature (VCC=12V, VFB=0V)
Switch Current Limit (A)
Saturation Voltage (V)
3
2.5
-50
-30
-10
10
30
50
70
90
Temperature, Ta ()
Temperature, Ta ()
13 12
Supply Current v.s. Temperature (VCC=12V, No Load, VON/OFF=0V,(Switch ON))
60 55
Supply Current v.s. Temperature (VCC=12V, No Load, VON/OFF=5V,(Switch OFF))
Supply Current (mA)
11 10 9 8 7 6 5 -50 -30 -10 10 30 50 70 90 110 130
Switch ON
Supply Current (uA)
50 45 40 35 30
Switch OFF
-50 -30 -10 10 30 50 70 90 110 130 150 Temperature, Ta ()
Temperature, Ta ()
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TYPICAL CHARACTERISTICS (Cont.)
Frequency v.s. Temperature (VCC=12V, IOUT=500mA, VOUT=5V)
170 165
LINEAR INTEGRATED CIRCUIT
Feedback Current v.s. Temperature (VCC=12V, VOUT=5V, VFB=1.3V)
10 0 -10 -20 -30 -40 -50
160 155 150 145 140 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature, Ta ()
Feedback Current (nA)
Frequency (KHz)
-50 -30 -10 10 30 50 70 90 110 130 150 Temperature, Ta ()
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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