LT3685

PRODUCTION

36V, 2A, 2.4MHz Step-Down Switching Regulator

Data Sheet (Rev. C) Product Selection Table
Part Models
8
1ku List Price
Starting From $3.66
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Part Details

  • Wide Input Range:
    • Operation From 3.6V to 36V
    • Overvoltage Lockout Protects Circuit through
    • 60V Transients
  • 2A Maximum Output Current
  • Adjustable Switching Frequency: 200kHz to 2.4MHz
  • Low Shutdown Current: IQ < 1µA
  • Integrated Boost Diode
  • Synchronizable Between 250kHz to 2MHz
  • Power Good Flag
  • Saturating Switch Design: 0.25Ω On-Resistance
  • 0.790V Feedback Reference Voltage
  • Output Voltage: 0.79V to 20V
  • Soft-Start Capability
  • Small 10-Pin Thermally Enhanced MSOP and (3mm x 3mm) DFN Packages
LT3685
36V, 2A, 2.4MHz Step-Down Switching Regulator
3.3V Step-Down Converter Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Application Note 1

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Power System Managers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Silicon Oscillators 1
LTC6902
PRODUCTION Multiphase Oscillator with Spread Spectrum Frequency Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT3685
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
DC1167A

LT3685EMSE Demo Board | (MSOP) 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V @ 2A

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Product Details

Demonstration circuit 1167 is a monolithic step-down DC/DC switching regulator featuring the LT3685 in the MSOP-10 exposed pad package. The demo board provides 5V @ 2A from a 6.3V to 38V input and has transient protection up to 60V. The demo boards default switching frequency is 500kHz, but the LT3685 has a SYNC pin which allows frequency synchronization to an external clock over a 250kHz to 2MHz range.

eval board
schematic 2
DC1212A-B

LT3685EDD Demo Board | (DFN) EN55022-Compliant, 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V @ 2A

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Product Details

Demonstration circuit 1212A-B is a monolithic step-dwon DC/DC switching regulatro featuring the LT3685 in the 3x3 DFN-10 package. The demo board provides 5V@2A from a 6.3V to 38V input and has transient protection up to 60V. The demo boards default switching frequency is 800kHz, but the LT3685 has a SYNC pin which allows frequency synchronization to an external clock over a 250kHz to 2MHz range. The LT3685's quiescent current is 0.9mA, while the LT3480 has a 70uA quiescent current.


An EMC filter at the input makes the circuit compatible with EMC standard EN55022 Class B.
DC1167A
LT3685EMSE Demo Board | (MSOP) 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V @ 2A
DC1167A - Schematic
DC1212A-B
LT3685EDD Demo Board | (DFN) EN55022-Compliant, 6.3V ≤ VIN ≤ 38V (60V Transients), VOUT = 5V @ 2A
DC1212A-A - Schematic

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