SLVUCH5 july 2023 LMQ64480-Q1 , LMQ644A0-Q1 , LMQ644A2-Q1
LM(Q)64408(-Q1), LM(Q)644A0(-Q1) and LM(Q)644A2(-Q1) Dual Buck DC/DC Converter family provides flexibility, scalability, and optimized solution size for a wide range of applications. With integrated power MOSFETs, the device is stackable up to 6-phases for higher output currents up to 36 A, and uses a current-mode control architecture for easy loop compensation. The device supports input voltage surge up to 36 V and dip as low as 3 V. The switching frequency is adjustable from 100 kHz to 2.2 MHz using the RT pin and also can be synchronized to an external clock to eliminate beat frequencies in noise-sensitive applications. The output regulation target is programmed to a fixed 3.3 V, 5 V or adjustable using external feedback resistors. Available EMI mitigation features include spread spectrum, integrated input bypass capacitors and low package parasitic with enhanced QFN package.
| Part Number | Rated IOUT | PACKAGE | DIMENSIONS |
|---|---|---|---|
| LM(Q)64408(-Q1) | 4 A per channel | Enhanced QFN (25) | 5.0 mm × 4.0 mm |
| LM(Q)644A0(-Q1) | 5 A per channel | ||
| LM(Q)644A2(-Q1) | 6 A per channel |
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The LMQ644A2QEVM-D2100 evaluation board showcases the features and performance of the LMQ644A2-Q1, dual buck DC/DC converter with integrated power MOSFETs. The EVM provides dual 6-A outputs. The output voltages can be individually programmed to a fixed 3.3 V, 5 V or adjustable using external feedback resistors. Also, each channel can be enabled or disabled by a jumper selection.
The switching frequency at the full load is programmed to 2.1 MHz as a default. The switching mode at the light load is selectable between FPWM and AUTO mode. Also, spread spectrum can be enabled or disabled by a jumper selection. If an external pulse signal is applied to the SYNC pin, the switching frequency is synchronized to the external clock.