Texas Instruments LMQ644A0QRXARQ1
Manufacturer No:
LMQ644A0QRXARQ1
Manufacturer:
Texas Instruments
Package:
Description:
Automotive, 36V, 10A, low-IQ dual-output synchronous step-down converter
Quantity:
In Stock :3174
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Shipped from：HK Warehouse
Expected Shipping：Sun, May 31 - Mon, Jun 1, 2026
Lead Time：Inquire about availability
Date Code：Within 2 Years
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LMQ644A0QRXARQ1 Information
Texas Instruments LMQ644A0QRXARQ1 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments LMQ644A0QRXARQ1.
- Type
- Parameter
- Rating
- Automotive
- Topology
- Buck
- Iout (max) (A)
- 10
- Vin (max) (V)
- 36
- Vin (min) (V)
- 3
- Vout (max) (V)
- 20
- Vout (min) (V)
- 0.8
- Features
- Enable, Frequency synchronization, Overcurrent protection, Power good, Spread Spectrum, Synchronous rectification, Wettable flanks package
- EMI features
- Integrated capacitors, Low parasitic Hotrod packaging, Spread Spectrum
- Control mode
- current mode
- Type
- Parameter
- Switching frequency (min) (kHz)
- 400
- Switching frequency (max) (kHz)
- 2.2, 2200
- Operating temperature range (°C)
- -40 to 150
- Iq (typ) (µA)
- 40
- Duty cycle (max) (%)
- 98
- Type
- Converter
- Package
- VQFN-FCRLF (RXA)
- Pins
- 24
- Size
- 20 mm² 5 x 4
- REACH Status
- Yes
Download datasheets and manufacturer documentation for Texas Instruments LMQ644A0QRXARQ1.
User guide:
Functional safety information:
Data sheet:
EVM User's guide:
The LMQ644xx-Q1 is a 36V, synchronous, buck, DC/DC converter for high-current single or dual outputs. The device uses an interleaved, stackable, current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with an output clock supporting up to 6 phases for currents up to 36A. A high-side switch minimum on-time of 50ns gives large step-down ratios, enabling the direct conversion from 12V, 24V, or automotive inputs to low-voltage rails for reduced system complexity and design cost.
The LMQ644xx-Q1 incorporates spread spectrum in an optimized enhanced HotRod QFN package, with wettable flanks, and four 22nF high frequency integrated capacitors to minimize EMI. Dual Random Spread Spectrum (DRSS) frequency hopping is set to ±10% (typical), drastically reducing emissions through a combination of triangular and pseudo-random modulation. A bias pin allows the LMQ644xx-Q1 to save losses by powering the device from the output of the converter, achieving a 9µA no-load quiescent current to extend the operating run-time in battery-powered systems. The LMQ644xx-Q1 can maintain high efficiency light-load operation even when stacking multiple devices for high efficiency over the full load range.
- AEC-Q100 qualified for automotive applications:
- Device temperature grade 1: –40°C to +125°C ambient operating temperature
- Operation up to 150°C junction temperature
- Functional Safety-Capable
- Designed for Low EMI
- Symmetrical input voltage pins with > 1mm clearance to ground
- Four 22nF integrated VIN to GND bypass capacitors
- Two bypass capacitors placed in series between each VIN and GND for high reliability
- Pin selectable spread spectrum option
- Pin selectable FPWM or auto mode operation
- Enhanced HotRod™ QFN (25) package with wettable flanks
- Switching frequency from 100kHz to 2.2MHz
- Meets CISPR 25 class 5 EMI requirements
- Single and dual-output features
- Wide input voltage range of 3V to 36V
- 1% accurate fixed 3.3V, 5V or adjustable outputs from 0.8V to 20V
- Hiccup-mode overcurrent protection and thermal shutdown protection with hysteresis
- Precision ENABLE and PGOOD functions
- 50ns tON(min) for high VIN / VOUT ratio
- 80ns tOFF(min) for low dropout
- Versatile dual-output operation
- Shutdown mode current: 0.5µA typical
- No-load standby current: 9µA typical
- Built-in compensation and 3ms soft start
- Independent precision ENABLE and PGOOD
- Adaptable single-output operation
- > 95% efficient for an 8A load, single output, VIN =12V, VOUT = 5V
- External compensation and adjustable soft start
- PGOOD, SYNCIN, and SYNCOUT functions
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