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LM78S40
  • LM78S40

LM78S40

ACTIVE

1.5A Adjustable Step Up, Step Down or Inverting Regulator

Texas Instruments LM78S40 Product Info

1 April 2026 3

Parameters

Rating

Catalog

Topology

Boost, Buck, Flyback, Forward, Inverting, SEPIC

Vin (max) (V)

40

Vin (min) (V)

2.5

Vout (max) (V)

40

Vout (min) (V)

1.245

Features

Adjustable current limit, Nonsynchronous

Operating temperature range (°C)

0 to 70

Iq (typ) (A)

0.0018

Package

PDIP (NFG)-16-52.451 mm² 6.35 x 8.26

Features

  • Step-up, step-down or inverting switching regulators
  • Output adjustable from 1.25V to 40V
  • Peak currents to 1.5A without external transistors
  • Operation from 2.5V to 40V input
  • Low standby current drain
  • 80 dB line and load regulation
  • High gain, high current, independent op amp
  • Pulse width modulation with no double pulsing
  • Step-up, step-down or inverting switching regulators
  • Output adjustable from 1.25V to 40V
  • Peak currents to 1.5A without external transistors
  • Operation from 2.5V to 40V input
  • Low standby current drain
  • 80 dB line and load regulation
  • High gain, high current, independent op amp
  • Pulse width modulation with no double pulsing

Description

The LM78S40 is a monolithic regulator subsystem consisting of all the active building blocks necessary for switching regulator systems. The device consists of a temperature compensated voltage reference, a duty-cycle controllable oscillator with an active current limit circuit, an error amplifier, high current, high voltage output switch, a power diode and an uncommitted operational amplifier. The device can drive external NPN or PNP transistors when currents in excess of 1.5A or voltages in excess of 40V are required. The device can be used for step-down, step-up or inverting switching regulators as well as for series pass regulators. It features wide supply voltage range, low standby power dissipation, high efficiency and low drift. It is useful for any stand-alone, low part count switching system and works extremely well in battery operated systems.

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