UTC LD1596L-S08-T 2a 150khz 40v buck dc/dc converter with led driver and battery charge Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LD1596
Preliminary
CMOS IC
2A 150kHz 40V BUCK DC/DC
CONVERTER WITH LED
DRIVER AND BATTERY
CHARGE

DESCRIPTION
The UTC LD1596 is a 150KHz fixed frequency PWM buck
(step-down) DC/DC converter, capable of driving a 2A load with
high efficiency.
The PWM control circuit is able to adjust the duty ratio linearly
from 0~100%. An enable function, an over current protection
function is built inside. An internal compensation block is built in to
minimize external component count.

SOP-8
FEATURES
* Wide 4.5V~40V Input Voltage Range
* Output Adjustable from 1.235V~37V
* Minimum Drop Out 1.5V
* Fixed 150kHz Switching Frequency
* 2A Constant Output Current Capability
* Internal Optimize Power Transistor
* Excellent line and load regulation
* TTL shutdown capability
* ON/OFF pin with hysteresis function

ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LD1596L-S08-T
LD1596G-S08-T
LD1596L-S08-R
LD1596G-S08-R
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
Package
Packing
SOP-8
SOP-8
Tube
Tape Reel
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LD1596


CMOS IC
PIN CONFIGURATION
SW
1
SW
2
GND
3
FB
4
UTC
LD1596
8
VIN
7
VIN
6
EN
5
CS
PIN DESCRIPTION
PIN NO.
1, 2
3
4
5
6
7, 8

Preliminary
PIN NAME
SW
GND
FB
CS
EN
VIN
DESCRIPTION
Power Switch Pin (SW).
Ground Pin.
Output control Pin
Output Current Sense Pin
Enable Pin.
Supply Voltage Input Pin.
BLOCK DIAGRAM
EN
180mV
VIN
+
60mΩ
1.23V Reference
Start Up
Current Limit
VREF
-
OCP
CS
FB
+
+
EA
-
-
COMP
+
Latch
Driver
Thermal Shutdown
Switch
SW
Oscillator
150KHz
+
OVP
GND
VREF -
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LD1596

Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
-0.3~45
V
FB Pin Voltage
VFB
-0.3~VIN
V
EN Pin Voltage
VEN
-0.3~VIN
V
SW Pin Voltage
VSW
-0.3~VIN
V
Power Dissipation
PD
Internally limited
mW
Thermal Resistance (Junction to Ambient, No
RJA
50
°C/W
Heatsink, Free Air)
Operating Junction Temperature
TJ
-40~125
°C
Storage Temperature
TSTG
-65~150
°C
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.

THERMAL DATA
PARAMETER
Junction to Ambient

SYMBOL
θJA
RATINGS
150
ELECTRICAL CHARACTERISTICS (TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
System Parameters Test Circuit Figure 1
Feedback Voltage
VFB
VIN=8V~32V, VOUT=5V, ILOAD=0.2A~2A 1.21
Efficiency
η
VIN=12V, VOUT=5V, IOUT=2A

UNIT
°C/W
TYP
MAX
UNIT
1.235
81
1.26
V
%
ELECTRICAL CHARACTERISTICS (DC PARAMETERS)
VIN=12V, GND=0V, VIN & GND parallel connect a 220uf/50V capacitor; IOUT=500mA, TA=25°C, the others floating
unless otherwise specified
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
Input Operation Voltage
VIN
4.5
40
V
Shutdown Supply Current
ISTBY
VEN=5V
80
200
uA
Quiescent Supply Current
IQ
VEN=0V, VFB=VIN
2
5
mA
Oscillator Frequency
Fosc
127
150
172
Khz
Switch current Limit
IL
VFB=0
3
A
High (Regulator OFF)
1.4
V
EN Pin Threshold
VEN
Low (Regulator ON)
0.8
V
Output Saturation Voltage
VCE
VFB=0V, ISW=2A
1.1
1.4
V
Constant Current Sense Voltage
VCS
0.132 0.155 0.178
V
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LD1596

Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
CFF 33nF
R1
+12~24V
CIN
220uF/35V
FB
EN
4
6
VIN
UTC 1, 2 SW
7, 8
LD1596
3
5
C1
GND
CS
105
Figure 1. UTC
+6~36V
CIN
100uF/50V
R2
VOUT
Battery
D1
1N5821
COUT
220uF/35V
Rcs
L 33uH
Icharge=0.155V/Rcs
LED 1~5W
SK34
COUT
100uF/25V
Rcs
Typical Application Circuit (LED Constant Current Driver)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
L 47uH
Typical Application Circuit (Li Battery Charger)
FB
EN
4
6
VIN
UTC 1, 2 SW
7, 8
LD1596
3
5
C1
GND
CS
105
Figure 2. UTC
VOUT=1.235×(1+R2/R1)
Icharge=0.155V/Rcs
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LD1596
Preliminary
CMOS IC
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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