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Datasheet
2.5A 150KHZ PWM Buck DC/DC Converter TD1507
October, 20, 2005. Techcode Semiconductor Limited
1
General Description
The TD1507 is a easy to use adjustable
step-down (buck) switch-mode voltage regulators.
The device is available in an adjustable output
version. It is capable of driving a 2.5A load with
excellent line and load regulation.
Requiring a minimum number of external
components, the regulator is simple to use and
include internal frequency compensation, and a
fixed-frequency oscillator.
The output voltage is guaranteed to 3%
tolerance under specified input voltage and
output load conditions. The oscillator frequency is
guaranteed to 15%. External shutdown is
included, featuring typically 80 A standby current.
Self protection features include a two stage
frequency reducing current limit for the output
switch and an over temperature shutdown for
complete protection under fault conditions.
The TD1507 is available in TO252-5L package.
Features
Adjustable output version
Output adjustable from 1.23v to 34V
Fixed 150KHz frequency internal oscillator
Guaranteed 2.5A output load current
Input voltage range up to 36V
Low power standby mode, I
Q
typically 70 A
TTL shutdown capability
Excellent line and load regulation
High efficiency
Thermal shutdown and current limit protection
Available in TO252-5L package
Applications
Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
LCD monitor and LCD TV
DVD recorder and PDP TV
Battery charger
Step-down to 3.3V for microprocessors
Package Types
TO252-5L
Figure 1. Package Types of TD1507
Datasheet
2.5A 150KHZ PWM Buck DC/DC Converter TD1507
October, 20, 2005. Techcode Semiconductor Limited
2
Pin Assignments
Pin Descriptions
Ordering Information
Name Description
Vin
Input supply voltage
Output Switching
output
Gnd Ground
Feedback
Output voltage feedback
ON/OFF ON/OFF
shutdown
Active is "Low" or floating
5 ON/OFF
4 Feedback
3 Gnd
2 Output
1 Vin
TO252-5L
X
X
TD1507
Circuit Type
Package
T: TO252-5L
Packing
Blank: Tube
R: Tape and Reel
Datasheet
2.5A 150KHZ PWM Buck DC/DC Converter TD1507
October, 20, 2005. Techcode Semiconductor Limited
3
Functional Block Diagram
Typical Application
Figure 2. Functional Block Diagram of TD1507
Figure 3. Typical Application of TD1507
Datasheet
2.5A 150KHZ PWM Buck DC/DC Converter TD1507
October, 20, 2005. Techcode Semiconductor Limited
4
Absolute Maximum Ratings
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect reliability.
Parameter Value
Unit
Supply Voltage Vin
-0.3 to 40
V
Feedback VFB pin voltage
-0.3 to Vin+0.3
V
ON/OFF Pin voltage
-0.3 to Vin+0.3
V
Output pin voltage
-0.3 to Vin+0.3
V
Output Voltage to Ground (Steady State)
-1
V
Power Dissipation
Internally limited
W
Operating Temperature Range
-40 to +125
C
Storage Temperature
-65 to +150
C
Lead Temperature (Soldering, 10 sec)
200
C
ESD(HM) 2000
V
Electrical Characteristics
Unless otherwise specified, Vin = 12V. Iload = 0.5A, Ta = 25
.
Symbol Parameter
Conditions
Min.
Typ.
Max.
Unit
I
b
Feedback bias current
V
FB
=1.3V
10
50/100 nA
I
Q
Quiescent
current V
FB
=12V force driver off
5
10
mA
I
STBY
Standby quiescent current
ON/OFF=5V, V
IN
=36V 70
150
uA
F
OSC
Oscillator
frequency
127 150
173 KHz
V
SAT
Saturation
voltage
I
OUT
=2A
1.10
1.4/1.5 V
I
CL
Current Limit
Peak Current (V
FB
=0V)
4.5
5.5/6.5 A
Output leakage current
Output=0V (V
FB
=12V) 50 uA
I
L
I
L
Output leakage current
Output=-1V (V
IN
=36V) 2
30 mA
Low (Regulator ON)
1.3
0.6
V
V
IL
V
IH
ON/OFF pin logic input
Threshold voltage
High (Regulator OFF)
2.0
1.3
V
I
H
ON/OFF pin input current
V
LOGIC
=2.5V(Regulator OFF)
5
15
uA
Datasheet
2.5A 150KHZ PWM Buck DC/DC Converter TD1507
October, 20, 2005. Techcode Semiconductor Limited
5
I
L
V
LOGIC
=0.5V(Regulator ON)
0.02
5
uA
JC
Thermal Resistance
Junction to Case
TO252-5L
10
O
C/W
JA
Thermal Resistance
Junction to Ambient
(Note1)
TO252-5L
50
O
C/W
Vfb: Output Voltage
11V
V
IN
36V, 0.2AI
LOAD
3A, V
OUT
for 9V
1.193/
1.180
1.23
1.267/
1.280
V
TD1507
ADJ
: Efficiency
V
IN
=12V,V
OUT
=9V,I
LOAD
=3A
88
%
Specifications with boldface type are for full operationg temperature range, the other type are for
T
J
=25
O
C.
Note1: Thermal resistance with copper area of approximately 3 in
2
.
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