TL2575 Datasheet, PDF (1/23 Pages) Texas Instruments – 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

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TL2575, TL2575HV
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS
SLVS638 – MAY 2006
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
APPLICATIONS
• Simple High-Efficiency Step-Down (Buck)
Regulators
• Pre-Regulators for Linear Regulators
• On-Card Switching Regulators
• Positive-to-Negative Converters (Buck-Boost)
KTT (TO-263) PACKAGE
(TOP VIEW)
5
ON/OFF
4
FEEDBACK
3
GND
2
OUTPUT
1
V_IN
N (PDIP) PACKAGE
(TOP VIEW)
NC ₁
NC 2
OUTPUT 3
NC 4
GND 5
NC 6
FEEDBACK 7
NC 8
16 ^VIN
15 NC
14 NC
13 GND
12 GND
11 NC
10 NC
9 ON/OFF
NC − No internal connection
KV (TO-220 STAGGERED LEADS) PACKAGE
(TOP VIEW)
(SIDE VIEW)
5
ON/OFF
4
FEEDBACK
3
GND
2
OUTPUT
1
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.
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, Texas Instruments Incorporated