LT3695 Series

PRODUCTION

1A Fault Tolerant Micropower Step-Down Regulator

Data Sheet Product Selection Table
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Overview

  • Wide Input Range:
    • Operation from 3.6V to 36V
    • Overvoltage Lockout Protects Circuits Through 60V Transients
  • FMEA Fault Tolerant:
    • Output Stays at or Below Regulation Voltage
    • During Adjacent Pin Short or When a Pin Is Left Floating
  • 1A Output Current
  • Low Ripple (< 15mVP-P) Burst Mode® Operation
    • IQ = 75μA for 12VIN to 3.3VOUT with No Load
  • Adjustable Switching Frequency: 250kHz to 2.2MHz
  • Short-Circuit Protected
  • Synchronizable Between 300kHz and 2.2MHz
  • Output Voltage: 0.8V to 20V
  • Power Good Flag
  • Fixed Output Voltage Versions for 3.3V and 5V Available
  • Small, Thermally Enhanced 16-Pin MSOP Package

The LT3695 series are adjustable frequency (250kHz to 2.2MHz) monolithic buck switching regulators that accept input voltages up to 36V and can safely sustain transient voltages up to 60V. The devices include a high efficiency switch, a boost diode, and the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. A SYNC pin allows the user to synchronize the part to an external clock, and to choose between low ripple Burst Mode operation and standard PWM operation.

The LT3695 regulators tolerate adjacent pin shorts or an open pin without raising the output voltage above its programmed value.

Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. Shutdown reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). Protection circuitry senses the current in the power switch and external Schottky catch diode to protect the LT3695 regulators against short-circuit conditions. Frequency foldback and thermal shutdown provide additional protection.

The LT3695 series is available in a thermally enhanced 16-pin MSOP package.

Applications

  • Automotive Battery Regulation
  • Automotive Entertainment Systems
  • Distributed Supply Regulation
  • Industrial Supplies
LT3695 Series
1A Fault Tolerant Micropower Step-Down Regulator
5V Step-Down Converter Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 2
LTC4364
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3695
  • LT3695-3.3
  • LT3695-5
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.

Evaluation Kits

eval board
schematic 1
DC1578A-B

LT3695EMSE-5 Demo Board | Fault-Tolerant, 6.9V ≤ VIN ≤ 36/60V, VOUT = 5V @ 1A

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Product Details

Demonstration circuit 1578A-B is a micropower monolithic step-down DC/DC switching regulator featuring the fixed 5V output LT3695-5. The demo board operates from 6.9V to 36V and can withstand input voltage transients up to 60V. It provides 5V @ 1A at its output. The LT3695 family tolerates adjacent pin shorts or an open pin without raising the output voltage above its programmed value.

eval board
schematic 2
DC1519A

LT3695EMSE Demo Board | Fault-Tolerant, 6.9V ≤ VIN ≤ 36/60V, VOUT = 5V @ 1A

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Product Details

Demonstration circuit 1591A is a monolithic step-down switching regulator featuring the LT3695EMSE. The demo board is designed for 5V/1A output from a 6.9V to 36V input, with transients up to 60V. The LT3695 tolerates adjacent pin shorts or an open pin without raising the output voltage above its programmed value.

eval board
schematic 3
DC1578A-A

LT3695EMSE-3.3 Demo Board | Fault-Tolerant, 4.5V ≤ VIN ≤ 36/60V, VOUT = 3.3V @ 1A

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Product Details

Demonstration circuit 1578A-A is a micropower monolithic step-down DC/DC switching regulator featuring the fixed 3.3V output LT3695-3.3. The demo board operates from 4.5V to 36V and can withstand input voltage transients up to 60V. It provides 3.3V @ 1A at its output. The LT3695 family tolerates adjacent pin shorts or an open pin without raising the output voltage above its programmed value.
DC1578A-B
LT3695EMSE-5 Demo Board | Fault-Tolerant, 6.9V ≤ VIN ≤ 36/60V, VOUT = 5V @ 1A
DC1578A-A - Schematic
DC1519A
LT3695EMSE Demo Board | Fault-Tolerant, 6.9V ≤ VIN ≤ 36/60V, VOUT = 5V @ 1A
DC1519A - Schematic
DC1578A-A
LT3695EMSE-3.3 Demo Board | Fault-Tolerant, 4.5V ≤ VIN ≤ 36/60V, VOUT = 3.3V @ 1A
DC1578A-A - Schematic

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