LTC1538-AUX
Info: : PRODUCTION
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LTC1538-AUX

Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $8.74
Features
  • Maintains Constant Frequency at Low Output Currents
  • Dual N-Channel MOSFET Synchronous Drive
  • Programmable Fixed Frequency (PLL Lockable)
  • Wide VIN Range: 3.5V to 36V Operation
  • Ultrahigh Efficiency
  • Very Low Dropout Operation: 99% Duty Cycle
  • Low Dropout, 0.5A Linear Regulator for VPP
  • Generation or Low Noise Audio Supply
  • Built-In Power-On Reset Timer
  • Programmable Soft Start
  • Low-Battery Detector
  • Remote Output Voltage Sense
  • Foldback Current Limiting (Optional)
  • Pin Selectable Output Voltage
  • 5V Standby Regulator Active in Shutdown: IQ < 200 µA
  • Output Voltages from 1.19V to 9V
  • Available in 28- and 36-Lead SSOP Packages
Additional Details
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The LTC1538-AUX/LTC1539 are dual, synchronous step-down switching regulator controllers which drive external N-channel power MOSFETs in a phase-lockable fixed frequency architecture. The Adaptive PowerTM output stage selectively drives two N-channel MOSFETs at frequencies up to 400kHz while reducing switching losses to maintain high efficiencies at low output currents.

An auxiliary 0.5A linear regulator using an external PNP pass device provides a low noise, low dropout voltage source. A secondary winding feedback control pin (SFB1) guarantees regulation regardless of load on the main output by forcing continuous operation.

A 5V/20mA regulator, internal 1.19V reference and an uncommitted comparator remain active when both controllers are shut down. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (typ 300ms) after the controller’s output is within 5% of the regulated first voltage. Internal resistive dividers provide pin selectable output voltages with remote sense capability on one of the two outputs.

The operating current levels are user-programmable via external current sense resistors. Wide input supply range allows operation from 3.5V to 30V (36V maximum).

Applications

  • Notebook and Palmtop Computers, PDAs
  • Portable Instruments
  • Battery-Operated Devices
  • DC Power Distribution Systems
Part Models 4
1ku List Price Starting From $8.74

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC1538CG-AUX#PBF
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LTC1538CG-AUX#TRPBF
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LTC1538IG-AUX#PBF
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LTC1538IG-AUX#TRPBF
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Product Lifecycle

PCN

Aug 6, 2022

- 22_0171

Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC1538CG-AUX#PBF

PRODUCTION

LTC1538CG-AUX#TRPBF

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LTC1538IG-AUX#PBF

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LTC1538IG-AUX#TRPBF

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Aug 6, 2022

- 22_0171

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Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC1538CG-AUX#PBF

PRODUCTION

LTC1538CG-AUX#TRPBF

PRODUCTION

LTC1538IG-AUX#PBF

PRODUCTION

LTC1538IG-AUX#TRPBF

PRODUCTION

Software and Part Ecosystem

Software and Part Ecosystem

Evaluation Kit

Evaluation Kits 2

DC125A-TO

LTC1538CG-AUX | Constant Frequency, High Efficiency, 3 Output DC/DC Converter 3.3V, 5V, 12V Gapped Toroid with Oscon Caps

DC125A-E

LTC1538CG-AUX | Constant Frequency, High Efficiency, 3 Output DC/DC Converter 3.3V, 5V, 12V Gapped E-Core

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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