LM2575
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
www.ti.com
SLVS569C–JANUARY 2005–REVISED JULY 2005
FEATURES
KC (TO-220) PACKAGE
•
Fixed 3.3-V, 5-V, 12-V, and 15-V Options With
(TOP VIEW)
±5% Regulation (Max) Over Line, Load, and
Temperature Conditions
5
ON/OFF
FEEDBACK
GND
4
3
2
1
•
Adjustable Option With a Range of 1.23 V to
37 V and ±4% Regulation (Max) Over Line,
Load, and Temperature Conditions
OUTPUT
V
IN
•
•
•
Specified 1-A Output Current
KV (TO-220 STAGGERED LEADS) PACKAGE
Wide Input Voltage Range…4.75 V to 40 V
(TOP VIEW)
(SIDE VIEW)
Requires Only Four External Components
(Fixed Versions) and Uses Readily Available
Standard Inductors
•
•
52-kHz (Typ) Fixed-Frequency Internal
Oscillator
5
ON/OFF
FEEDBACK
GND
4
3
2
1
TTL Shutdown Capability With 50-µA (Typ)
Standby Current
OUTPUT
V
IN
•
•
High Efficiency…as High as 88% (Typ)
Thermal Shutdown and Current-Limit
Protection With Cycle-by-Cycle Current
Limiting
Pins 1, 3, 5
Pins 2, 4
KTG PACKAGE
(TOP VIEW)
APPLICATIONS
•
Simple High-Efficiency Step-Down (Buck)
Regulator
Pre-Regulator for Linear Regulators
On-Card Switching Regulators
Positive-to-Negative Converter (Buck-Boost)
ON/OFF
FEEDBACK
GND
5
4
•
•
•
3
2
OUTPUT
1
V
IN
DESCRIPTION/ORDERING INFORMATION
KTT (TO-263) PACKAGE
(TOP VIEW)
The LM2575 greatly simplifies the design of switching
power supplies by conveniently providing all the
active functions needed for a step-down (buck)
switching regulator in an integrated circuit. Accepting
a wide input voltage range and available in fixed
output voltages of 3.3 V, 5 V, 12 V, 15 V, or an
adjustable output version, the LM2575 has an
integrated switch capable of delivering 1 A of load
current, with excellent line and load regulation. The
device also offers internal frequency compensation, a
fixed-frequency oscillator, cycle-by-cycle current
limiting, and thermal shutdown. In addition, a manual
shutdown is available via an external ON/OFF pin.
5
4
3
ON/OFF
FEEDBACK
GND
2
1
OUTPUT
V
IN
N PACKAGE
(TOP VIEW)
NC
NC
V
IN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
OUTPUT
NC
GND
GND
GND
GND
NC
GND
NC
FB
NC
ON/OFF
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerFLEX is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.