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Conv DC-DC 3V to 36V Synchronous Step Down Single-Out 1V to 34.2V 3.5A Automotive 14-Pin VQFN-HR T/R

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LM61435AASQRJRRQ1 General Description

The LM61435-Q1 is an automotive-focused, high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 3.5 A of output current is delivered over a wide input range of 3.0 V to 36 V; tolerant of 42 V, easing input surge protection design. The LM61435-Q1 implements soft recovery from dropout eliminating overshoot on the output.

The LM61435-Q1 is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be set or synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.

Key Features

  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Optimized for ultra low EMI requirements
    • Hotrod™ package and parallel input path minimize switch node ringing
    • Spread spectrum reduces peak emissions
    • Adjustable SW node rise time
  • Designed for automotive applications
    • Supports 42-V automotive load dump
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN, with factory option for 3.3-V fixed output voltage
    • 0.3-V dropout with 3-A load (typical)
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • External bias option for improved efficiency
  • Suitable for scalable power supplies
    • Pin compatible with:
      • LM61440-Q1 (36 V, 4 A, adjustable fSW)
      • LM61460-Q1 (36 V, 6 A, adjustable fSW)


Vin (min) (V) 3 Vin (max) (V) 36
Vout (min) (V) 1 Vout (max) (V) 34
Iout (max) (A) 3.5 Iq (typ) (mA) 0.007
Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200
EMI features Low parasitic Hotrod packaging, Spread Spectrum Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package
Operating temperature range (°C) -40 to 150 Rating Automotive
TI functional safety category Functional Safety-Capable Regulated outputs (#) 1
Control mode current mode Duty cycle (max) (%) 98
Type Converter Number of Pins 14
Max Duty Cycle 98 % Max Junction Temperature (Tj) 150 °C
Max Operating Temperature 150 °C Max Supply Voltage 36 V
Min Operating Temperature -40 °C Min Supply Voltage 3 V
Nominal Supply Current 9 µA Number of Outputs 1
Output Current 3.5 A Height 1 mm
Length 4 mm Thickness 900 µm
Width 3.5 mm


Shipping Method

Our products are mainly transported and delivered by DHL, FedEx, UPS and other logistics partners on site -- Available to 200+ countries.

Delivery Time

The delivery time is usually within 2-7 days, depending on the logistics provider and the area of delivery.

The following are the estimated delivery times of some logistics service providers.

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Checks and other instruments are not supported to pay for orders and customers are required to pay all possible fees, including sales tax,
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Our policies and procedures are designed to ensure compliance with various quality specifications and to quickly resolve quality-related issues.

We promise to provide 365 days quality assurance service for all our products.

If you have any dissatisfaction with the quality of the product you received, you can contact us for a refund or exchange, as long as the product is kept in its original condition.


AVAQ determines and packages all devices based on electrostatic discharge (ESD) and moisture sensitivity level (MSL) protection requirements.
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LM61435AASQRJRRQ1 Datasheet PDF

Preliminary Specification LM61435AASQRJRRQ1 PDF Download


Buying Guide

  • What is the lifespan of LM61435AASQRJRRQ1?

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