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LM61440AASQRJRRQ1

Automotive 3-V to 36-V, 4-A, low-noise synchronous step-down converter

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LM61440AASQRJRRQ1
Datasheet:

LM61440AASQRJRRQ1 Datasheet (PDF)
Vin (min) (V):

3
Vin (max) (V):

36
Vout (min) (V):

1
Vout (max) (V):

34
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LM61440AASQRJRRQ1 General Description

The LM61440-Q1 is an automotive-focused, high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 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 LM61440-Q1 implements soft recovery from dropout eliminating overshoot on the output.

The LM61440-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.

Key Features

AEC-Q100 qualified with the following results:
- Temperature grade 1: –40°C to 150°C, T_J
Functional Safety-Capable
- Documentation available to aid functional safety system design
Optimized for ultra-low EMI requirements
- HotRod package minimizes switch node ringing
- Parallel input path minimizes parasitic inductance
- 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
- V_OUT adjustable from 1 V to 95% of V_IN
- 0.3-V dropout with 3-A load (typical)
High efficiency power conversion at all loads
- 7-µA no load current at 13.5 V_IN, 3.3 V_OUT
- 83% PFM efficiency at 1-mA, 13.5 V_IN, 5 V_OUT
- External bias option for improved efficiency
Suitable for scalable power supplies
- Pin compatible with:
  - LM61460-Q1 (36 V, 6 A, adjustable f_SW)
  - LM61435-Q1 (36, 3.5 A, adjustable f_SW)

Specifications

Vin (min) (V)	3	Vin (max) (V)	36
Vout (min) (V)	1	Vout (max) (V)	34
Iout (max) (A)	4	Iq (typ) (mA)	0.008
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	feature-type	Synchronous Step Down
feature-isolation		feature-process-technology
feature-output-type	Adjustable	feature-switching-frequency-khz	200 to 2200
feature-number-of-outputs	1	feature-output-voltage-v	1 to 34.2
feature-maximum-output-current-a	4	feature-maximum-output-power-w
feature-minimum-input-voltage-v	3	feature-maximum-input-voltage-v	36
feature-typical-switch-current-a		feature-efficiency-
feature-packaging		feature-rad-hard
feature-pin-count	14	feature-cecc-qualified
feature-esd-protection		feature-escc-qualified
feature-military	No	feature-aec-qualified	Yes
feature-aec-qualified-number	AEC-Q100	feature-eccn-code	EAR99
feature-svhc		feature-svhc-exceeds-threshold	No

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Ratings and Reviews

G**n 03/02/2022

The order arrived quickly enough. Arrived in a regular bag with pimples. Everything is safe and sound, the legs are whole and not bent. In work, the goods have not yet been tested, there was not yet an opportunity. Thanks to the seller for the product and the quick shipment.