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  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. External Power Switch Buck Controllers
  6. LTC1436A

Data Sheet
PDF
User Guides
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Overview

Features and Benefits

  • Maintains Constant Frequency at Low Output Currents
  • Programmable Fixed Frequency (PLL Lockable)
  • Wide VIN Range: 3.5V to 36V Operation
  • Low Minimum On-Time (≤300ns) for High Frequency, Low Duty Cycle Applications
  • Dual N-Channel MOSFET Synchronous Drive
  • Very Low Dropout Operation: 99% Duty Cycle
  • Low Dropout, 0.5A Linear Regulator for CPU I/O or Low Noise Audio Supplies
  • Built-In Power-On Reset Timer
  • Programmable Soft Start
  • Low-Battery Detector
  • Remote Output Voltage Sense
  • Foldback Current Limiting (Optional)
  • Pin Selectable Output Voltage
  • Logic Controlled Micropower Shutdown: IQ < 25µA
  • Output Voltages from 1.19V to 9V
  • Available in 24-Lead Narrow SSOP and 28-Lead SSOP Packages

Product Details

The LTC1436A/LTC1437A are synchronous step-down switching regulator controllers that drive external N-channel power MOSFETs in a phase lockable, fixed frequency architecture. The Adaptive Power™ 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 (SFB) guarantees regulation regardless of the load on the main output by forcing continuous operation.

An additional comparator is available for use as a lowbattery detector. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (300ms typically) after the output is within 5% of the regulated output voltage. Internal resistive dividers provide pin selectable output voltages with remote sense capability.

The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum).

Applications

  • Notebook and Palmtop Computers, PDAs
  • Cellular Telephones and Wireless Modems
  • Portable Instruments
  • Battery-Operated Devices
  • DC Power Distribution Systems

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Evaluation Kits (3)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (2)
  • Design Notes (2)
  • Technical Articles (2)
    • Document Type

    Tools & Simulations

    LTspice

    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.

    LTspice

    Models for the following parts are available in LTspice:

    LTC1436A-PLL

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC1436ACGN#PBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436ACGN#TRPBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436ACGN-PLL#PBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436ACGN-PLL#TRPBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436AEGN#PBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436AEGN#TRPBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436AIGN#PBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436AIGN#TRPBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436AIGN-PLL#PBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    LTC1436AIGN-PLL#TRPBF Material Declaration Reliability Data 24-Lead SSOP (Narrow 0.15 Inch)
    Wafer Fabrication Data R393 Reliability Data

    PCN-PDN Information

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    Select Model for PCN Information
    • LTC1436ACGN#PBF Production
    • LTC1436ACGN#TRPBF Production
    • LTC1436ACGN-PLL#PBF Production
    • LTC1436ACGN-PLL#TRPBF Production
    • LTC1436AEGN#PBF Production
    • LTC1436AEGN#TRPBF Production
    • LTC1436AIGN#PBF Production
    • LTC1436AIGN#TRPBF Production
    • LTC1436AIGN-PLL#PBF Production
    • LTC1436AIGN-PLL#TRPBF Production

    Support & Discussions

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