Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

LT1507 - 500kHz Monolithic Buck Mode Switching Regulator

Features

  • Constant 500kHz Switching Frequency
  • Uses All Surface Mount Components
  • Operates with Inputs as Low as 4V
  • Saturated Switch Design (0.3ohms)
  • Cycle-by-Cycle Current Limiting
  • Easily Synchronizable
  • Inductor Size as Low as 2µH
  • Shutdown Current: 20µA

Typical Application

LT1507 Typical Application
LT1507 Typical Application

Description

The LT1507 is a 500kHz monolithic buck mode switching regulator, functionally identical to the LT1375 but optimized for lower input voltage applications. It will operate over a 4V to 15V input range, compared with 5.5V to 25V for the LT1375. A 1.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage (3.3V) and adjustable parts are available.A special high speed bipolar process and new design techniques allow this regulator to achieve high efficiency at a high switching frequency. Efficiency is maintained over a wide output current range by keeping quiescent supply current to 4mA and by utilizing a supply boost capacitor to allow the NPN power switch to saturate. A shutdown signal will reduce supply current to 20µA. The LT1507 can be externally synchronized from 570kHz to 1MHz with logic level inputs.The LT1507 fits into standard 8-pin SO and PDIP packages. Temperature rise is kept to a minimum by the high efficiency design. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used including the inductor and capacitors.

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
LT1507CN8-3.3#PBF N-8 N C 05-08-1510 (N8) Yes
LT1507CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1507CS8-3.3#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1507CS8-3.3#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1507CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1507CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1507IN8-3.3#PBF N-8 N I 05-08-1510 (N8) Yes
LT1507IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1507IS8-3.3#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1507IS8-3.3#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1507IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1507IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1507 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
LT1507CN8-3.3#PBF N-8 C $4.35 $3.50 Yes
LT1507CN8#PBF N-8 C $4.35 $3.50 Yes
LT1507CS8-3.3#PBF SO-8 C $4.50 $3.70 Yes
LT1507CS8-3.3#TRPBF SO-8 C $3.76 Yes
LT1507CS8#PBF SO-8 C $4.50 $3.65 Yes
LT1507CS8#TRPBF SO-8 C $3.71 Yes
LT1507IN8-3.3#PBF N-8 I $5.25 $4.20 Yes
LT1507IN8#PBF N-8 I $5.25 $4.20 Yes
LT1507IS8-3.3#PBF SO-8 I $5.40 $4.35 Yes
LT1507IS8-3.3#TRPBF SO-8 I $4.41 Yes
LT1507IS8#PBF SO-8 I $5.40 $4.35 Yes
LT1507IS8#TRPBF SO-8 I $4.41 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.

Part Number Description Price Documentation
DC138B-B LT1507CS8 | SYNCHRONIZED STEP DOWN CONVERTER 3.3V, 1.25A, @ 500KHZ (USES ADJ PART) Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Portable Computers
  • Battery-Powered Systems
  • Battery Charger
  • Distributed Power

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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:
LT1507
LT1507-3.3

Technical Support