Product details


Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 3.2 Vout (Max) (V) 9.9 Iout (Max) (A) 2 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 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) 16 32 mm² 5 x 6.4 open-in-new Find other Buck converters (integrated switch)


  • 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
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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 Nov. 22, 2016
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 2021
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical article How to overcome minimum on-time challenges in switching power supplies Jan. 12, 2017
User guide LM53602xEVM and LM53603xEVM User’s Guide (Rev. A) May 23, 2016

Design & development

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Hardware development

document-generic User guide
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 (...)
  • Configurable to meet  the user's need
  • Compact design

Design tools & simulation

SNVMA57A.ZIP (100 KB) - PSpice Model
SNVMA58A.ZIP (98 KB) - PSpice Model
SNVMA59.ZIP (63 KB) - PSpice Model
SNVMAC1.ZIP (7 KB) - PSpice Model
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 (...)
  • 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
  • (...)

Reference designs

High Density Efficient Solution for Main Aux as well as Back up Aux Power in Drones
PMP10650 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 (...)
document-generic Schematic
2.2MHz Switching, Synchronous Split Supply Reference Design for 12V Battery with all Protections
PMP10651 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 (...)
document-generic Schematic

CAD/CAE symbols

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HTSSOP (PWP) 16 View options

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