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17V, 4MHz, dual 3.5A synchronous buck with spread spectrum modulation reduces EMI in a compact 3mm x 5mm QFN

20 March 2018

Dual 3.5A, 17V Synchronous Step-Down DC/DC Converter in 3mm x 5mm QFN Package
Dual 3.5A, 17V Synchronous Step-Down DC/DC Converter in 3mm x 5mm QFN Package

Analog Devices announces the LTC7124, a high efficiency, 4MHz synchronous dual output buck regulator that incorporates a constant frequency, peak current mode architecture. Optional spread spectrum frequency modulation is integrated for reducing radiated and conductive EMI noise.

The device can deliver up to 3.5A of continuous output current from each channel or generate a 2-phase single output up to 7A in a compact 3mm x 5mm footprint package. The switching frequency is user programmable from 500kHz to 4MHz, enabling the use of tiny, low cost capacitors and inductors; also included is external clock synchronisation capability for noise-sensitive applications.

The LTC7124 operates from an input voltage of 3.1V to 17V with an output voltage range of 0.6V to 99% of VIN, with high ±1% VOUT accuracy, ideal for 1-4 cell Li-Ion applications as well as 5V and 12V intermediate bus systems. Other key applications include battery-powered systems, point-of-load supplies, portable instruments and handheld scanners.

Each channel of the LTC7124 uses internal N-channel MOSFET switches with RDS (ON) of only 80m? and 40m? to deliver efficiencies as high as 95%. The two channels run 180 degrees out-of-phase, minimising the size of both input and output capacitance. User-selectable Burst Mode® operation is used to maximise light load efficiency, requiring only 8µA with both channels enabled and only 5.5µA of quiescent current with one channel enabled.

For applications requiring the lowest possible noise, the LTC7124 can be configured to run in forced continuous operation, reducing output voltage ripple and potential RF interference. Additional features include input overvoltage and overtemperature protection, power good voltage monitors, independent soft-start capability for each channel, internal or external loop compensation, programmable current limit and short-circuit protection.

The LTC7124 is available in a thermally enhanced 3mm x 5mm QFN-24 package. E- and I-grade versions are guaranteed to operate over the -40°C to 125°C operating junction temperature. The E-grade is priced starting at $4.05 each in 1,000-piece quantities.  All versions are available from stock. For more information, visit www.linear.com/product/LTC7124.

Summary of Features: LTC7124

- Wide VIN Range: 3.1V to 17V
- Wide VOUT Range: 0.6V to 99% VIN
- Dual Step-Down Outputs: 3.5A per Channel
- Spread Spectrum Modulation for Low Radiated & Conductive Noise
- Integrated 80m?­/40m?­ N-Channel MOSFETs Provide Up to 95% Efficiency
- No-Load IQ < 8µA with Both Channels Enabled; IQ < 5.5µA with Only One Channel Enabled
- Programmable Frequency (500kHz to 4MHz) with ±25% Frequency Synchronisation Range
- Configurable for a 2-Phase Single Output at up to 7A ±1% Output Voltage Accuracy
- Current Mode Operation for Excellent Line & Load Transient Response
- Internal or External Loop Compensation
- Thermally Enhanced 3mm × 5mm QFN-24 Package

Pricing shown is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.

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