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LM2575 Datasheet

  • LM2575

  • 1A 简单步降开关稳压器，可调节

  • 482.60KB

  • 10页

  • TI

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LM2575
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
www.ti.com
SLVS569D 鈥?JANUARY 2005 鈥?REVISED JULY 2005
FEATURES
鈥?/div>
Fixed 3.3-V, 5-V, 12-V, and 15-V Options With
卤5%
Regulation (Max) Over Line, Load, and
Temperature Conditions
Adjustable Option With a Range of 1.23 V to
37 V and
卤4%
Regulation (Max) Over Line,
Load, and Temperature Conditions
Specified 1-A Output Current
Wide Input Voltage Range鈥?.75 V to 40 V
Requires Only Four External Components
(Fixed Versions) and Uses Readily Available
Standard Inductors
52-kHz (Typ) Fixed-Frequency Internal
Oscillator
TTL Shutdown Capability With 50-碌A (Typ)
Standby Current
High Efficiency鈥s High as 88% (Typ)
Thermal Shutdown and Current-Limit
Protection With Cycle-by-Cycle Current
Limiting
KTT (TO-263) PACKAGE
(TOP VIEW)
5
4
3
2
1
鈥?/div>
鈥?/div>
鈥?/div>
GND
鈥?/div>
ON/OFF
FEEDBACK
GND
OUTPUT
V
IN
N (PDIP) PACKAGE
(TOP VIEW)
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
NC
NC
OUTPUT
NC
GND
NC
FB
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
IN
NC
GND
GND
GND
GND
NC
ON/OFF
APPLICATIONS
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Simple High-Efficiency Step-Down (Buck)
Regulator
Pre-Regulator for Linear Regulators
On-Card Switching Regulators
Positive-to-Negative Converter (Buck-Boost)
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 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.
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 鈥?0掳C to 125掳C.
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 漏 2005, Texas Instruments Incorporated

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