Document
Product Folder
Sample & Buy
Technical Documents
Tools & Software
Support & Community
TL2575, TL2575HV
SLVS638C – JANUARY 2006 – REVISED NOVEMBER 2014
TL2575, TL2575HV 1-A Simple Step-Down Switching Voltage Regulators
1 Features
•1 Fixed 3.3-V, 5-V, 12-V, and 15-V Options with ±5% Regulation (Max) Over Line, Load, and Temperature Conditions
• Adjustable Option With a Range of 1.23 V to 37 V (57 V for HV Version) 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 (60 V for HV Version) • 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-μA (Typ) Standby Current • High Efficiency – As High as 88% (Typ) • Thermal Shutdown and Current-Limit Protection with Cycle-by-Cycle Current Limiting
2 Applications
• Simple High-Efficiency Step-Down (Buck) Regulators
• Pre-Regulators for Linear Regulators • On-Card Switching Regulators • Positive-to-Negative Converters (Buck-Boost)
3 Description
The TL2575 and TL2575HV devices provide all the active functions needed for a step-down (buck) switching regulator in an integrated circuit. They require four to six external components for operation. They accept a wide input-voltage range of up to 60 V (TL2575-HV) and are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, or an adjustableoutput version. The TL2575 and TL2575HV devices have 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-bycycle current limiting, and thermal shutdown. In addition, a manual shutdown is available via an external ON/OFF pin.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
PDIP (16)
19.31 mm x 6.35 mm
TL2575, TL2575HV TO-263 (5)
10.16 mm x 8.93 mm
TO-220 (5)
10.16 mm x 8.82 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
4 Functional Block Diagram
Unregulated DC Input
VIN
1 +
CIN
Internal Regulator
On/Off
ON/OFF 5
FEEDBACK 4
Fixed-Gain R2 Error Amplifier
R1 1 kΩ
+ _
Comparator + _
1-A Driver Switch
OUTPUT L1
2 D1
+ COUT
1.23-V Band-Gap Reference
52-kHz
Thermal Current
Oscillator Reset Shutdown
Limit
GND 3
VOUT
L O A D
3.3 V: R2 = 1.7 kΩ 5 V: R2 = 3.1 kΩ 12 V: R2 = 8.84 kΩ 15 V: R2 = 11.3 kΩ ADJ: R1 = Open, R2 = 0 Ω
Pin numbers are for the KTT (TO-263) package.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
TL2575, TL2575HV
SLVS638C – JANUARY 2006 – REVISED NOVEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Functional Block Diagram .................................... 1 5 Revision History..................................................... 2 6 Pin Configuration and Functions ......................... 3 7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ..................................... 4 7.2 Handling Ratings ...................................................... 4 7.3 Recommended Operating Conditions....................... 4 7.4 Thermal Information .................................................. 4 7.5 Electrical Characteristics — TL2575........................ 5 7.6 Electrical Characteristics — TL2575HV................... 6 7.7 Typical Characteristics .............................................. 7 8 Parameter Measurement Information ................ 10 8.1 Test Circuits ............................................................ 10 9 Detailed Description ............................................ 11
9.1 Overview ................................................................. 11 9.2 Functional Block Diagram ....................................... 11 9.3 Feature Description................................................. 12 9.4 Device Functional Modes........................................ 12 10 Application and Implementation........................ 13 10.1 Typical Application ............................................... 13 11 Power Supply Recommendations ..................... 20 12 Layout................................................................... 20 12.1 Layout Guidelines ................................................. 20 12.2 Layout Example .................................................... 20 13 Device and Documentation Support ................. 21 13.1 Related Links ...................................