1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS
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SLVS638B – MAY 2006 – REVISED JANUARY 2007
FEATURES
•
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)
Require Only Four External Components
(Fixed Versions) and Use 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
GND
KTT (TO-263) PACKAGE
(TOP VIEW)
5
4
3
2
1
•
ON/OFF
FEEDBACK
GND
OUTPUT
V
IN
•
•
•
GND
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
KV (TO-220 STAGGERED LEADS) PACKAGE
(TOP VIEW)
(SIDE VIEW)
APPLICATIONS
•
•
•
•
Simple High-Efficiency Step-Down (Buck)
Regulators
Pre-Regulators for Linear Regulators
On-Card Switching Regulators
Positive-to-Negative Converters (Buck-Boost)
5
4
3
2
1
ON/OFF
FEEDBACK
GND
OUTPUT
V
IN
Pins 1, 3, 5
Pins 2, 4
DESCRIPTION/ORDERING INFORMATION
The TL2575 and TL2575HV greatly simplify 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 of up to 60 V (HV version) and available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, or
an adjustable-output version, the TL2575 and TL2575HV 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-by-cycle current limiting, and thermal shutdown. In addition, a manual shutdown
is available via an external ON/OFF pin.
The TL2575 and TL2575HV represent superior alternatives to popular three-terminal linear regulators. Due to
their high efficiency, the devices significantly reduce the size of the heatsink and, in many cases, no heatsink is
required. Optimized for use with standard series of inductors available from several different manufacturers, the
TL2575 and TL2575HV greatly simplify the design of switch-mode power supplies by requiring a minimal
addition of only four to six external components for operation.
The TL2575 and TL2575HV are characterized for operation over the virtual junction temperature range of –40°C
to 125°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.
PowerPAD, PowerFLEX are trademarks of Texas Instruments.
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 © 2006–2007, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
