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LM3691

ACTIVE

High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications

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Data sheet

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TPS62860 ACTIVE 1.75-V to 5.5-V, 0.6-A ultra-low IQ step-down buck converter with I2C/VSEL interface Smaller solution size and low quiescent current with I2C/VSEL interface

LM3691

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -30 to 85 Topology Buck Type Converter Iout (max) (A) 1 Vin (min) (V) 2.3 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 3600 Switching frequency (max) (kHz) 4400 Features Enable, Forced PWM, Light Load Efficiency, Light load efficiency, Synchronous Rectification Control mode Voltage mode Vout (min) (V) 0.75 Vout (max) (V) 3.3 Iq (typ) (µA) 64 Duty cycle (max) (%) 100
Rating Catalog Operating temperature range (°C) -30 to 85 Topology Buck Type Converter Iout (max) (A) 1 Vin (min) (V) 2.3 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 3600 Switching frequency (max) (kHz) 4400 Features Enable, Forced PWM, Light Load Efficiency, Light load efficiency, Synchronous Rectification Control mode Voltage mode Vout (min) (V) 0.75 Vout (max) (V) 3.3 Iq (typ) (µA) 64 Duty cycle (max) (%) 100
DSBGA (YZR) 6 2.1875 mm² 1.75 x 1.25
  • Input Voltage: 2.3 V to 5.5 V
  • Output Voltage: 0.75 V to 3.3 V
  • ±1% DC Output Voltage Precision
  • 4-MHz Switching Frequency
  • 64-μA (typical) Quiescent Current in ECO Mode
  • 1-A Maximum Load Capability
  • Automatic ECO/PWM Mode Switching
  • MODE Pin to Select ECO/Forced PWM Mode
  • Current Overload and Thermal Shutdown Protections
  • Only Three Tiny Surface-Mount External Components Required (Solution Size Less Than 15 mm2)
  • Input Voltage: 2.3 V to 5.5 V
  • Output Voltage: 0.75 V to 3.3 V
  • ±1% DC Output Voltage Precision
  • 4-MHz Switching Frequency
  • 64-μA (typical) Quiescent Current in ECO Mode
  • 1-A Maximum Load Capability
  • Automatic ECO/PWM Mode Switching
  • MODE Pin to Select ECO/Forced PWM Mode
  • Current Overload and Thermal Shutdown Protections
  • Only Three Tiny Surface-Mount External Components Required (Solution Size Less Than 15 mm2)

The LM3691 step-down DC-DC converter is optimized for powering ultra-low-voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1-A load current over an input voltage range from 2.3 V to 5.5 V. There are several different fixed voltage output options available.

The LM3691 has a mode-control pin that allows the user to select Forced PWM mode or ECO mode that changes modes between gated PWM mode and PWM automatically, depending on the load. In ECO mode, the device offers superior efficiency and very low IQ under light load conditions. ECO mode extends the battery life through reduction of the quiescent current during light load conditions and system standby.

The LM3691 is available in a 6-pin DSBGA package. Only three external surface-mount components, a
1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF output capacitor, are required.

For all available packages, see the orderable addendum at the end of the data sheet.

The LM3691 step-down DC-DC converter is optimized for powering ultra-low-voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1-A load current over an input voltage range from 2.3 V to 5.5 V. There are several different fixed voltage output options available.

The LM3691 has a mode-control pin that allows the user to select Forced PWM mode or ECO mode that changes modes between gated PWM mode and PWM automatically, depending on the load. In ECO mode, the device offers superior efficiency and very low IQ under light load conditions. ECO mode extends the battery life through reduction of the quiescent current during light load conditions and system standby.

The LM3691 is available in a 6-pin DSBGA package. Only three external surface-mount components, a
1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF output capacitor, are required.

For all available packages, see the orderable addendum at the end of the data sheet.
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Technical documentation

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Type Title Date
* Data sheet LM3691 High-Accuracy, Miniature 1-A Step-Down DC-DC Converter for Portable Applications datasheet (Rev. J) PDF | HTML 17 Dec 2015
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide AN-1772 LM3691 Evaluation Board (Rev. B) 30 Apr 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 May 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM3691TL-1.8EV — LM3691TL-1.8 Evaluation Board

The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range from 2.3V to 5.5V. There are several different fixed voltage output options available.

The (...)

User guide: PDF
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Simulation model

LM3691 Unencrypted PSpice Average Model Package (Rev. A)

SNVMAM5A.ZIP (22 KB) - PSpice Model
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Simulation model

LM3691 Unencrypted PSpice Transient Model Package (Rev. C)

SNVMAL9C.ZIP (118 KB) - PSpice Model
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Package Pins Download
DSBGA (YZR) 6 View options
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