T
echcode
®
2A 150KHz PWM Buck DC/DC Converter
Features
DATASHEET
TD1509
General Description
The TD1509 is a series of easy to use fixed and
adjustable step-down (buck) switch-mode voltage
regulators. These devices are available in fixed output
voltage of 5V,3.3V an adjustable output version. Both
versions are capable of driving a 2A load with excellent
line and load regulation.
Requiring a minimum number of external components,
these regulators are 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 µA 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 TD1509 is available in SOP8 and DIP8 packages.
5V,3.3V and adjustable output versions
Output adjustable from 1.23v to 43V
Fixed 150KHz frequency internal oscillator
Guaranteed 3A output load current
Input voltage range up to 45V
Low power standby mode, I
Q
typically 80 µA
TTL shutdown capability
Excellent line and load regulation
Requires only 4 external components
High efficiency
Thermal shutdown and current limit protection
Available in SOP8 and DIP8 packages
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
SOP8
DIP8
Figure 1. Package Types of TD1509
December, 20, 2005.
Techcode Semiconductor Limited
www.techcodesemi.com
1
T
echcode
®
2A 150KHz PWM Buck DC/DC Converter
DATASHEET
TD1509
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
Input Voltage
Feedback Pin Voltage
ON/OFF Pin Voltage
Output Pin Voltage
Power Dissipation
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD (HBM)
MSL
Thermal Resistance-Junction to Ambient
Thermal Resistance-Junction to Case
RθJA
RθJC
Symbol
V
IN
V
FB
V
EN
V
SW
P
D
T
J
T
STG
T
LEAD
Value
-0.3 to 45
-0.3 to Vin+0.3
-0.3 to Vin+0.3
-0.3 to Vin+0.3
Internally limited
150
-65 to 150
260
2000
Level3
85
45
ºC / W
ºC / W
Unit
V
V
V
V
mW
ºC
ºC
ºC
V
Recommended Operating Conditions
Parameter
Input Voltage
Operating Junction Temperature
Operating Ambient Temperature
Symbol
V
IN
T
J
T
A
Min.
3.6
-40
-40
Max.
45
125
85
Unit
V
ºC
ºC
December, 20, 2005.
Techcode Semiconductor Limited
www.techcodesemi.com
4
T
echcode
®
2A 150KHz PWM Buck DC/DC Converter
DATASHEET
TD1509
Electrical Characteristics
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
.
Parameters
Feedback bias current
Quiescent current
Standby quiescent current
Oscillator frequency
Saturation voltage
Current Limit
Output leakage current
Output leakage current
ON/OFF pin logic input
Threshold voltage
I
b
Symbol
Test Condition
Adjustable only,
V
FB
=1.3V
V
FB
=12V force driver
off
ON/OFF=5V, V
IN
=36V
Min.
Typ.
10
5
80
Max.
50/100
10
200/250
173
1.4/1.5
4.2
50
Unit
nA
mA
uA
KHz
V
A
uA
mA
V
I
Q
I
STBY
F
OSC
V
SAT
I
CL
I
L
I
L
V
IL
V
IH
I
H
I
L
127
I
OUT
=3A
Peak Current (V
FB
=0V)
Output=0V (V
FB
=12V)
Output=-1V (V
IN
=36V)
Low (Regulator ON)
150
1.2
3.8
2
1.3
30
0.6
High (Regulator OFF)
V
LOGIC
=2.5V(Regulator
OFF)
V
LOGIC
=0.5V(Regulator
ON)
2.0
1.3
V
ON/OFF pin input current
5
0.02
45
15
5
O
uA
uA
C/W
Thermal Resistance
Junction to Case
Thermal Resistance
Junction to Ambient
(Note1)
θ
JC
θ
JA
85
O
C/W
December, 20, 2005.
Techcode Semiconductor Limited
www.techcodesemi.com
5
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