LT1376 - 1.5A, 500kHz Step-Down Switching Regulators


  • Constant 500kHz Switching Frequency
  • Uses All Surface Mount Components
  • Inductor Size Reduced to 5μH
  • Easily Synchronizable
  • Saturating Switch Design: 0.4Ω
  • Effective Supply Current: 2.5mA
  • Shutdown Current: 20μA
  • Cycle-by-Cycle Current Limiting

Typical Application

LT1376 Typical Application
LT1376 Typical Application


The LT1375/LT1376 are 500kHz monolithic buck mode switching regulators. 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 and adjustable parts are available.A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. A shutdown signal will reduce supply current to 20μA on both parts. The LT1375 can be externally synchronized from 580kHz to 900kHz with logic level inputs.

The LT1375/LT1376 fit into standard 8-pin PDIP and SO packages, as well as a fused lead 16-pin SO with much lower thermal resistance. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors.

For low input voltage applications with 3.3V output, see LT1507. This is a functionally identical part that can operate with input voltages between 4.5V and 12V.


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

SO-8, N-8, SO-16

LT1376 Package Drawing
LT1376 Package Drawing
LT1376 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1376CN8 PDIP 8 C $4.35 $3.50 View
LT1376CN8-5 PDIP 8 C $4.35 $3.50 View
LT1376CN8-5#PBF PDIP 8 C $4.35 $3.50 View
LT1376CN8#PBF PDIP 8 C $4.35 $3.50 View
LT1376CS SO 16 C $4.35 $3.65 View
LT1376CS#PBF SO 16 C $4.35 $3.65 View
LT1376CS#TR SO 16 C $3.71 View
LT1376CS#TRPBF SO 16 C $3.71 View
LT1376CS8 SO 8 C $3.80 $3.20 View
LT1376CS8-5 SO 8 C $4.30 $3.60 View
LT1376CS8-5#PBF SO 8 C $4.30 $3.60 View
LT1376CS8-5#TR SO 8 C $3.66 View
LT1376CS8-5#TRPBF SO 8 C $3.66 View
LT1376CS8#PBF SO 8 C $3.80 $3.20 View
LT1376CS8#TR SO 8 C $3.26 View
LT1376CS8#TRPBF SO 8 C $3.26 View
LT1376HVCS SO 16 C $4.80 $4.00 View
LT1376HVCS#PBF SO 16 C $4.80 $4.00 View
LT1376HVCS#TR SO 16 C $4.06 View
LT1376HVCS#TRPBF SO 16 C $4.06 View
LT1376HVCS8 SO 8 C $4.20 $3.50 View
LT1376HVCS8#PBF SO 8 C $4.20 $3.50 View
LT1376HVCS8#TR SO 8 C $3.56 View
LT1376HVCS8#TRPBF SO 8 C $3.56 View
LT1376HVIS SO 16 I $5.60 $4.65 View
LT1376HVIS#PBF SO 16 I $5.60 $4.65 View
LT1376HVIS#TR SO 16 I $4.71 View
LT1376HVIS#TRPBF SO 16 I $4.71 View
LT1376HVIS8 SO 8 I $5.05 $4.24 View
LT1376HVIS8#PBF SO 8 I $5.05 $4.24 View
LT1376HVIS8#TR SO 8 I $4.30 View
LT1376HVIS8#TRPBF SO 8 I $4.30 View
LT1376IN8 PDIP 8 I $5.25 $4.20 View
LT1376IN8-5 PDIP 8 I $5.25 $4.20 View
LT1376IN8-5#PBF PDIP 8 I $5.25 $4.20 View
LT1376IN8#PBF PDIP 8 I $5.25 $4.20 View
LT1376IS SO 16 I $5.05 $4.25 View
LT1376IS#PBF SO 16 I $5.05 $4.25 View
LT1376IS#TR SO 16 I $4.31 View
LT1376IS#TRPBF SO 16 I $4.31 View
LT1376IS8 SO 8 I $4.55 $3.85 View
LT1376IS8-5 SO 8 I $5.40 $4.35 View
LT1376IS8-5#PBF SO 8 I $5.40 $4.35 View
LT1376IS8-5#TR SO 8 I $4.41 View
LT1376IS8-5#TRPBF SO 8 I $4.41 View
LT1376IS8#PBF SO 8 I $4.55 $3.85 View
LT1376IS8#TR SO 8 I $3.91 View
LT1376IS8#TRPBF SO 8 I $3.91 View
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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.

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