LTC7124 17 V, Dual 3.5 A Synchronous Step-Down Regulator

Spread spectrum modulation reduces EMI in Linear Technology’s compact 3 mm x 5 mm QFN step-down regulator.

Linear Technology’s LTC7124 is a dual-channel, 3.5 A per output, high efficiency monolithic step-down regulator capable of operating from input supplies up to 17 V. The programmable switching frequency ranges from 500 kHz to 4 MHz with a ±25% external clock synchronization capability around the programmed frequency. The regulator features ultra-low quiescent current for high efficiency over a wide V_OUT range.

The step-down regulator operates from an input voltage range of 3.1 V to 17 V and provides an adjustable output range from 0.6 V to 99% of V_IN while delivering up to 3.5 A of output current per channel. A user selectable mode input is provided to allow the user to trade off output ripple for light load efficiency; Burst Mode® operation provides the highest efficiency at light loads, while forced continuous operation provides the lowest output ripple. The LTC7124 includes spread spectrum modulation for low radiated and conductive noise. The LTC7124 is offered in a thermally enhanced, low-profile, 24-lead, 3 mm x 5 mm QFN package.

Features

• Wide VIN range: 3.1 V to 17 V
• Wide VOUT range: 0.6 V to 99% VIN
• Integrated 80 mΩ/40 mΩ N-channel MOSFETs. provide up to 95% efficiency
• No-load IQ < 8 µA with both channels enabled; IQ < 5.5 µA with only one channel enabled
• Programmable frequency (500 kHz to 4 MHz) with ±25% frequency synchronization range
• Dual step-down outputs: 3.5 A per channel
• Configurable for a 2-phase single output at up to 7 A
• ±1.0% output voltage accuracy
• Current mode operation for excellent line and load transient response
• Internal or programmable external loop compensation
• Available in a 3 mm x 5 mm QFN-24 package

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