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LM20323

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4.5-36V, 3A Current Mode Synchronous Buck Regulator

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4.5-36V, 3A Current Mode Synchronous Buck Regulator

LM20323

ACTIVE
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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 36 Vout (Min) (V) 0.8 Vout (Max) (V) 32 Iout (Max) (A) 3 Iq (Typ) (uA) 2300 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 500 Features Enable, Over Current Protection, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Buck converters (integrated switch)

Features

  • 4.5V to 36V Input Voltage Range
  • 3A Output Current, 5.2A Peak Current
  • 130 mΩ/110 mΩ Integrated Power MOSFETs
  • 93% Peak Efficiency with Synchronous Rectification
  • 1.5% Feedback Voltage Accuracy
  • Current Mode Control, Selectable Compensation
  • Fixed 500 kHz Switching Frequency
  • Adjustable Output Voltage Down to 0.8V
  • Compatible with Pre-biased Loads
  • Programmable Soft-start with External Capacitor
  • Precision Enable Pin with Hysteresis
  • Integrated OVP, UVLO, PGOOD
  • Internally Protected with Peak Current Limit, Thermal Shutdown and Restart
  • Accurate Current Limit Minimizes Inductor Size
  • Non-linear Current Mode Slope Compensation
  • 20-Pin HTSSOP Exposed Pad Package

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Description

The LM20323 is a full featured 500kHz synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems.

The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit.

The LM20323 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20323 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20323 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LMR33630 ACTIVE SIMPLE SWITCHER® 3.8V to 36V, 3A Synchronous Buck Converter With Ultra-Low EMI Next-generation 3.8-V to 36-V, 3-A synchronous buck converter with ultra-low EMI.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet LM20323 36V, 3A 500 kHz Synchronous Buck Regulator datasheet (Rev. C) Apr. 03, 2013
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
User guide AN-1790 LM20323 Evaluation Board (Rev. B) May 05, 2013
User guide AN-1792 LM20343 Evaluation Board (Rev. B) May 05, 2013
Application note AN-2077 LM20k POL Module (Rev. A) May 03, 2013

Design & development

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LM20323DESIGN-CALC

Reference designs

REFERENCE DESIGNS Download
6V - 18V Input Sync-Buck 0.5A LED Driver Reference Design
PMP10487 — This LM20323 integrated FET sync-buck converter regulates the current in a white LED to 0.5A with minimum parts count. LED current is accurately measured with an INA193 and provides feedback to regulate the output current.
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CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

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