LM3691

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

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Product details

Parameters

Vin (Min) (V) 2.3 Vin (Max) (V) 5.5 Vout (Min) (V) 0.75 Vout (Max) (V) 3.3 Iout (Max) (A) 1 Iq (Typ) (uA) 64 Switching frequency (Min) (kHz) 3600 Switching frequency (Max) (kHz) 4400 Features Enable, Forced PWM, Light Load Efficiency, Synchronous Rectification Operating temperature range (C) -30 to 85 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

DSBGA (YZR) 6 2 mm² 1.6 x 1.305 open-in-new Find other Buck converters (integrated switch)

Features

  • 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)
open-in-new Find other Buck converters (integrated switch)

Description

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
* Datasheet LM3691 High-Accuracy, Miniature 1-A Step-Down DC-DC Converter for Portable Applications datasheet (Rev. J) Dec. 17, 2015
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
User guide AN-1772 LM3691 Evaluation Board (Rev. B) Apr. 30, 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

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Hardware development

EVALUATION BOARD Download
99
Description

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 (...)

Features
  • VOUT = 0.75V to 1.8V
  • 1% DC output voltage precision
  • 2.3 ≤ VIN ≤ 5.5V
  • 4 MHz switching frequency
  • 64 µ A (typ.) quiescent current in ECO mode
  • 1A maximum load capability
  • Automatic ECO/PWM mode switching
  • Mode Pin to select ECO/Forced PWM mode
  • 1 µ H inductor, 4.7 µ F input capacitor (0603(1608) case size) and 4.7 (...)

Design tools & simulation

SIMULATION MODEL Download
SNVMAL9C.ZIP (118 KB) - PSpice Model
SIMULATION MODEL Download
SNVMAM5A.ZIP (22 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 6 View options

Ordering & quality

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  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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