1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
www.ti.com
SLVS569E – JANUARY 2005 – REVISED JANUARY 2006
FEATURES
•
Adjustable With a Range of 1.23 V to 37 V and
±4%
Regulation (Max) Over Line, Load, and
Temperature Conditions
Specified 1-A Output Current
Wide Input Voltage Range…4.75 V to 40 V
Uses Readily Available Standard Inductors
52-kHz (Typ) Fixed-Frequency Internal
Oscillator
TTL Shutdown Capability With 50-µA (Typ)
Standby Current
High Efficiency…as High as 88% (Typ)
Thermal Shutdown and Current-Limit
Protection With Cycle-by-Cycle Current
Limiting
For the Full Offering of Voltages (Including
Fixed-Output Options) and Packages
(Including TO-263), see TL2575 Datasheet
APPLICATIONS
•
•
•
•
Simple High-Efficiency Step-Down (Buck)
Regulator
Pre-Regulator for Linear Regulators
On-Card Switching Regulators
Positive-to-Negative Converter (Buck-Boost)
N (PDIP) PACKAGE
(TOP VIEW)
•
•
•
•
•
•
•
•
NC
NC
OUTPUT
NC
GND
NC
FEEDBACK
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
IN
NC
NC
GND
GND
NC
NC
ON/OFF
NC − No internal connection
DESCRIPTION/ORDERING INFORMATION
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 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.
The LM2575 represents a superior alternative to popular three-terminal linear regulators. Due to its high
efficiency, it significantly reduces the size of the heat sink and, in many cases, no heat sink is required.
Optimized for use with standard series of inductors available from several different manufacturers, the LM2575
greatly simplifies the design of switch-mode power supplies by requiring a minimal addition of only four to six
external components for operation.
The LM2575 is characterized for operation over the virtual junction temperature range of –40°C to 125°C.
ORDERING INFORMATION
T
J
–40°C to 125°C
(1)
V
O
(NOM)
ADJ
PDIP – N
PACKAGE
(1)
Tube of 25
ORDERABLE PART NUMBER
LM2575IN
TOP-SIDE MARKING
LM2575IN
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2006, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
