Product details

Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 3.2 Vout (Max) (V) 9.9 Iout (Max) (A) 3 Iq (Typ) (uA) 23 Switching frequency (Min) (kHz) 1850 Switching frequency (Max) (kHz) 2350 Features Enable, Forced PWM, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 3.2 Vout (Max) (V) 9.9 Iout (Max) (A) 3 Iq (Typ) (uA) 23 Switching frequency (Min) (kHz) 1850 Switching frequency (Max) (kHz) 2350 Features Enable, Forced PWM, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
HTSSOP (PWP) 16 32 mm² 5 x 6.4
  • 3-A or 2-A Maximum Load Current
  • Input Voltage Range From 3.5 V to 36 V: Transients to 42 V
  • Adjustable Output Voltage From 3.3 V to 10 V
  • 2.1-MHz Fixed Switching Frequency
  • ±2% Output Voltage Tolerance
  • –40°C to 150°C Junction Temperature Range
  • 1.7-µA Shutdown Current (Typical)
  • 24-µA Input Supply Current at No Load (Typical)
  • Reset Output With Filter and Delay
  • Automatic Light Load Mode for Improved Efficiency
  • User-Selectable Forced PWM Mode (FPWM)
  • Built-In Loop Compensation, Soft-Start, Current Limit, Thermal Shutdown, UVLO, and External Frequency Synchronization
  • Thermally Enhanced 16-Lead Package: 5 mm × 4.4 mm × 1 mm
  • 3-A or 2-A Maximum Load Current
  • Input Voltage Range From 3.5 V to 36 V: Transients to 42 V
  • Adjustable Output Voltage From 3.3 V to 10 V
  • 2.1-MHz Fixed Switching Frequency
  • ±2% Output Voltage Tolerance
  • –40°C to 150°C Junction Temperature Range
  • 1.7-µA Shutdown Current (Typical)
  • 24-µA Input Supply Current at No Load (Typical)
  • Reset Output With Filter and Delay
  • Automatic Light Load Mode for Improved Efficiency
  • User-Selectable Forced PWM Mode (FPWM)
  • Built-In Loop Compensation, Soft-Start, Current Limit, Thermal Shutdown, UVLO, and External Frequency Synchronization
  • Thermally Enhanced 16-Lead Package: 5 mm × 4.4 mm × 1 mm

The LM53603 and LM53602 buck regulators are specifically designed for 12-V industrial and automotive applications, providing an adjustable output voltage from 3.3 V to 10 V at 3 A or 2 A, from an input voltage of up to 36 V. Advanced high-speed circuitry allows the device to regulate from an input of up to 20 V, while providing an output of 5 V at a switching frequency of 2.1 MHz. The innovative architecture allows the device to regulate a 3.3-V output from an input voltage of only 3.5 V. All aspects of this product are optimized for the industrial and automotive customer. An input voltage range up to 36 V, with transient tolerance up to 42 V, eases input surge protection design. An open-drain reset output, with filtering and delay, provides a true indication of system status. This feature negates the requirement for an additional supervisory component, saving cost and board space. Seamless transition between PWM and PFM modes, along with a no-load operating current of only 24 µA, ensures high efficiency and superior transient response at all loads.

The LM53603 and LM53602 buck regulators are specifically designed for 12-V industrial and automotive applications, providing an adjustable output voltage from 3.3 V to 10 V at 3 A or 2 A, from an input voltage of up to 36 V. Advanced high-speed circuitry allows the device to regulate from an input of up to 20 V, while providing an output of 5 V at a switching frequency of 2.1 MHz. The innovative architecture allows the device to regulate a 3.3-V output from an input voltage of only 3.5 V. All aspects of this product are optimized for the industrial and automotive customer. An input voltage range up to 36 V, with transient tolerance up to 42 V, eases input surge protection design. An open-drain reset output, with filtering and delay, provides a true indication of system status. This feature negates the requirement for an additional supervisory component, saving cost and board space. Seamless transition between PWM and PFM modes, along with a no-load operating current of only 24 µA, ensures high efficiency and superior transient response at all loads.

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Technical documentation

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Type Title Date
* Data sheet LM53603 (3 A), LM53602 (2 A) 3.5 V to 36 V Wide-VIN Synchronous 2.1 MHz Step-Down Converters datasheet PDF | HTML 22 Nov 2016
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Technical article Effects of IC package on EMI performance 22 May 2018
EVM User's guide LM53602xEVM and LM53603xEVM User’s Guide (Rev. A) 23 May 2016
Technical article Stop "droning" on about power supply issues: find a solution 13 Nov 2015
Application note Create a Split-Rail Power Supply with a Wide Input Voltage Buck Regulator (Rev. A) 26 Oct 2012

Design & development

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

Evaluation board

LM53603AEVM — LM53603-Q1 Adjustable Output, 3A Buck Regulator Evaluation Module (EVM)

The LM53603AEVM demonstrates the capabilities of the LM53603 Automotive Integrated Buck regulator. It features all the input necessary to configure and operate the device. The EVM has an EMI filter on the back side. The user can choose to bypass that filter using the available posts close to the (...)
User guide: PDF
Not available on TI.com
Simulation model

LM53603 Adjustable PSpice Transient Model

SNVMA55.ZIP (62 KB) - PSpice Model
Simulation model

LM53603 Adjustable Unenecrypted PSpice Transient Model

SNVMAB8.ZIP (7 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Reference designs

PMP10223 — Automotive Power Supply with Pre-Boost Reference Design

The PMP10223 automotive power reference design provides 5.0V @ 1.1A, 3.3V @ 0.6A and 1.3V at 1.0A. A pre-boost provides 9.0V @ 1.7A to ensure proper operation even during startup of the engine. A synchronous buck converters generates 6.0V @ 2.2A as an intermediate rail for the following buck (...)
Schematic: PDF
Reference designs

PMP10650 — High Density Efficient Solution for Main Aux as well as Back up Aux Power in Drones

PMP10650 is a high power density 40W Buck Converter design optimized for Wide Vin Drone Design using the LM3150 controller IC (Used for Drone’s Backup Power) and LM53603. The design accepts an input voltage of 7Vin to 36Vin and provides the outputs of 5V@5A for Drone’s Backup power and (...)
Schematic: PDF
Reference designs

PMP10651 — 2.2MHz Switching, Synchronous Split Supply Reference Design for 12V Battery with all Protections

PMP10651 is a low noise, multi-output SMPS design where LM53603 is used in Inverting Buck-Boost Fly buck topology to generate positive and negative supply needed in multiple noise sensitive applications such as powering High Speed Video Amplifier, RF amplifier, Precision Low noise amplifier (...)
Schematic: PDF
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