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LM2595 Datasheet

Step-Down Switching Regulator

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LM2595
1.0 A, Step-Down Switching
Regulator
The LM2595 regulator is monolithic integrated circuit ideally suited
for easy and convenient design of a stepdown switching regulator
(buck converter). It is capable of driving a 1.0 A load with excellent
line and load regulation. This device is available in adjustable output
version and it is internally compensated to minimize the number of
external components to simplify the power supply design.
Since LM2595 converter is a switch mode power supply , its
efficiency is significantly higher in comparison with popular
threeterminal linear regulators, especially with higher input voltages.
The LM2595 operates at a switching frequency of 150 kHz thus
allowing smaller sized filter components than what would be needed
with lower frequency switching regulators. A vailable in a standard
5lead TO220 package with several different lead bend options, and
D2PAK surface mount package.
The other features include a guaranteed $4% tolerance on output
voltage within specified input voltages and output load conditions, and
$15% on the oscillator frequency . External shutdown is included,
featuring 50 mA (typical) standby current. Self protection features
include switch cyclebycycle current limit for the output switch, as
well as thermal shutdown for complete protection under fault
conditions.
Features
Adjustable Output Voltage Range 1.23 V 37 V
Guaranteed 1.0 A Output Load Current
Wide Input Voltage Range up to 40 V
150 kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability
Low Power Standby Mode, typ 50 mA
Thermal Shutdown and Current Limit Protection
Internal Loop Compensation
Moisture Sensitivity Level (MSL) Equals 1
PbFree Packages are Available
Applications
Simple HighEfficiency StepDown (Buck) Regulator
Efficient PreRegulator for Linear Regulators
OnCard Switching Regulators
Positive to Negative Converter (BuckBoost)
Negative StepUp Converters
Power Supply for Battery Chargers
http://onsemi.com
1
5
TO220
TV SUFFIX
CASE 314B
Heatsink surface connected to Pin 3
1
5
TO220
T SUFFIX
CASE 314D
Pin 1. Output
2. Vin
3. Ground
4. Feedback
5. ON/OFF
1
5
D2PAK
D2T SUFFIX
CASE 936A
Heatsink surface (shown as terminal 6 in
case outline drawing) is connected to Pin 3
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 23 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 23 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
February, 2009 Rev. 2
1
Publication Order Number:
LM2595/D
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  ON Semiconductor Electronic Components Datasheet  

LM2595 Datasheet

Step-Down Switching Regulator

No Preview Available !

12 V
Unregulated
DC Input
Cin
220 mF/
50 V
LM2595
+Vin
2
LM2595
Feedback
4
Output
L1
68 mH
Cff
1
3
GND
5
ON/OFF
D1
1N5822
R1=1K
R2=3.0K
Cout
220 mF
5V@1A
Regulated
Output
Figure 1. Typical Application
Figure 2. Representative Block Diagram
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (SteadyState)
Vin
ON/OFF
Output
45
0.3 V V +Vin
1.0
V
V
V
Power Dissipation
Case 314B and 314D (TO220, 5Lead)
Thermal Resistance, JunctiontoAmbient
Thermal Resistance, JunctiontoCase
Case 936A (D2PAK)
Thermal Resistance, JunctiontoAmbient
Thermal Resistance, JunctiontoCase
Storage Temperature Range
Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 kW)
PD
RqJA
RqJC
PD
RqJA
RqJC
Tstg
Internally Limited
65
5.0
Internally Limited
70
5.0
65 to +150
2.0
W
°C/W
°C/W
W
°C/W
°C/W
°C
kV
Lead Temperature (Soldering, 10 seconds)
260 °C
Maximum Junction Temperature
TJ 150 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only . Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
http://onsemi.com
2


Part Number LM2595
Description Step-Down Switching Regulator
Maker ON Semiconductor
Total Page 25 Pages
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