Power Management Switching Regulator Step-Up (Boost) Regulators Internal Power Switch Boost

LT1572 - 100kHz, 1.25A Switching Regulator with Catch Diode

Features

  • Catch Diode Included in Package
  • Wide Input Voltage Range: 3V to 30V
  • Low Quiescent Current: 6mA
  • Internal 1.25A Switch
  • Very Few External Parts Required
  • Self-Protected Against Overloads
  • Operates in Nearly All Switching Topologies
  • Shutdown Mode Draws Only 50µA Typical Current
  • Can Be Externally Synchronized

Typical Application

LT1572 Typical Application
LT1572 Typical Application

Description

The LT1572 is a 1.25A 100kHz monolithic switching regulator with on-board switch and catch diode included in one package. It combines an LT1172 with a 1A Schottky catch diode. The LT1572 can be operated in all standard switching configurations, including boost, buck, SEPIC, flyback, forward, inverting and "Cuk". All necessary control, oscillator and protection circuitry is included on the die with the high efficiency switch. This makes the part extremely easy to use and provides "bustproof" operation similar to that obtained with 3-pin linear regulators.The LT1572 operates with supply voltages from 3V to 30V and draws only 6mA quiescent current. It can deliver load power up to 15W with no external power devices. By utilizing a current mode switching technique, the LT1572 achieves excellent response to load and line transients.The LT1572 has many unique features not found on the more difficult to use control chips presently available. It uses adaptive anti-sat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50µA typical for standby operation. External synchronizing of switching frequency is possible, with a range of 120kHz to 160kHz.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LT1572CS#PBF SO-16 S C 05-08-1610 (S16) Yes
LT1572CS#TRPBF SO-16 S C 05-08-1610 (S16) Yes


LT1572 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LT1572CS#PBF SO-16 C $5.00 $3.95 Yes
LT1572CS#TRPBF SO-16 C $4.01 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • 3.3V-to-5V and 5V-to-12V Boost Converters
  • Negative-to-Positive Converter
  • SEPIC Converter (Input Can Be Greater or Less Than Output)
  • Battery Charger

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LT1572

Technical Support