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Product details

Parameters

Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 3.2 Vout (Max) (V) 9.9 Iout (Max) (A) 3 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 1850 Switching frequency (Max) (kHz) 2350 Features Enable, Forced PWM, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Soft Start Fixed, Synchronous Rectification Control mode Current Mode Duty cycle (Max) (%) 98 Type Converter Operating temperature range (C) -40 to 150 Rating Automotive 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)

Features

  • The LM53603-Q1, LM53602-Q1 are available as
    AEC-Q1-Qualified Automotive Grade Products
    With Following Results:
    • Device Temperature Grade 1: –40°C to +125°C
      Ambient Operating Range
    • Device HBM ESD Classification Level 1C
    • Device CDM ESD Classification Level C4B
  • 3 A or 2 A maximum load current
  • Input Voltage Range from 3.5 V to 36 V:
    Transients to 42 V
  • Output Voltage Options: 5 V, 3.3 V, ADJ
  • 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)
  • No external Feed-back Divider Required for 5 V or
    3.3 V output
  • 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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Description

The LM53603-Q1, LM53602-Q1 buck regulators are specifically designed for automotive applications, providing an output voltage of 5 V or 3.3 V (with ADJ option) 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 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

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
The LM536033EVM 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 (...)
Features
  • Configurable to meet  the user's need
  • Compact design
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

This EVM 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 converter (...)

Features
  • Configurable to meet  the user's need
  • Compact design
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
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 (...)
Features
  • Configurable to meet  the user's need
  • Compact design

Design tools & simulation

SIMULATION MODELS Download
SNVMA46.ZIP (72 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA55.ZIP (62 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA56.ZIP (61 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAB8.ZIP (7 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAB9.ZIP (7 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAC0.ZIP (7 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Power Supply Reference Design for Automotive Microcontroller in Gateway and Body Control Module
TIDA-01412 This discrete power supply reference design demonstrates a complete power solution for the Freescale™ MPC5748G Microcontroller. This simple discrete solution uses just five DC/DC converters, it offers a more flexible, scalable and cost-effective solution than when using a PMIC. This TI Design (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive Power Reference Design for Low Power TDA3x Based Systems
TIDA-00530 This solution was designed to make an integrated, size-optimized power design for ADAS applications using the TDA3x SoC off of an automotive battery input.  By targeting only applications with lower processing needs, we’re able to choose devices and components which are smaller, compared (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Front End Power Supply Reference Design with Cold Crank Operation, Transient Protection, EMI Filter
TIDA-00699 This solution was designed to be a broadly applicable automotive off-battery front end power supply for 10-15W systems. There is a focus on EMI/EMC testing and compliance as well to help designers satisfy the regulatory requirements associated with producing an automotive electronic subsystem.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
15-W System-Level Power Reference Design for Automotive Body Control Module
TIDA-00745 TIDA-00745 is a 14-W system-optimized (CISPR25 Class 4) SMPS design for an automotive body control module. All buck converters used in this design are switching at 2.1 MHz. 

The design is divided into four major blocks:

  1. EMI filter: Common mode and a differential filter for conducted EMI suppression
  2. (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive Power Supply with Pre-Boost Reference Design
PMP10223 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
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 document-generic User guide
REFERENCE DESIGNS Download
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 document-generic User guide
REFERENCE DESIGNS Download
System-Level Reference Design for 30W ADAS System With Required Automotive Protections
PMP10652 PMP10652 is a System optimized (CISPR 25 Class 3) 30W design for Surround View ADAS system.

The design has various protections such as Load dump through TVS (ISO pulse testing), Reverse Voltage (Innovative Smart diode with very low Iq), Battery Disconnect Switch with OVP protection (PFET) and is EMI (...)

document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
CISPR 25 Class 5 Multi-Output Power Supply Reference Design for Rear Camera, Automotive ADAS Systems
PMP9492 PMP9492 is a conducted EMI optimized (CISPR 25 Class 5) 9 W Multi output Design for  Wide Range Vin automotive ADAS application that supports Cold –Cranking Conditions . The design uses an LM53603 regulator IC (used as Buck), LM26420 (used as dual Buck) and TPS60150 regulator IC (used as (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
CISPR 25 Class 5 Rated 10 W Reference Design for Automotive USB Charger System
PMP9496 The PMP9496  reference design is a conducted EMI-optimized (CISPR 25 Class 5) 10 W design for  efficient automotive USB charger application utilizing the LM53603 regulator IC (2.1MHz fully-integrated synchronous buck for automotive application ) and TPS2549 USB switch(TPS2549-Q1 Automotive (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
System Level Power Reference Design for 20W ADAS system with Automotive Protections
PMP10750 PMP10750 is a System optimized (CISPR 25 Class 5) 20W design for upstream converter used in ADAS system with automotive protection.

The design has various protections such as Load dump through TVS (ISO pulse testing), Reverse Voltage (Innovative Smart diode with very low Iq), Battery Disconnect (...)

document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
15W Synchronous Buck Regulator with Integrated FETs Reference Design
PMP10534 PMP10534 is a single-phase synchronous buck converter using the LM53603 regulator IC, which contains integrated top-side and bottom-side FETs. The design accepts an input voltage of 7Vin to 36Vin and provides an output of 5Vout capable of supplying 3A of continuous current to the load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
EMI Optimized 2-layer 15W Power Supply for Automotive with CISPR 25 Class 5 Compliance
PMP10604 The PMP10604 reference design is a 2-layer board 5V, 3A output power supply using LM53603 buck regulator for cluster unit in automotive applications. The LM53603 is a 3.5V to 36V input, 3A output capable, and 2.1 MHz fixed frequency buck regulator, specially designed for automotive applications. It (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 16 View options

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