Linear Technology Launches 350mA Synchronous Step-Down DC/DC Converter with 92% Efficiency at 2MHz

Analog Devices, Inc. (ADI) Linear Technology Corporation has introduced the LT8606, a 350mA, 42V input synchronous step-down switching regulator. The unique synchronous rectification topology provides 92% efficiency when switching at 2MHz, allowing designers to avoid critical noise-sensitive frequency bands (such as AM radio bands) while achieving a very compact solution footprint. Let's learn about the relevant content with the power management editor.

Burst Mode® operation keeps quiescent current below 3µA in no-load standby conditions, making it ideal for always-on systems. Its 3.0V to 42V input voltage range makes it ideal for automotive applications, which must regulate in cold-crank and vehicle stop-start situations with minimum input voltages as low as 3.0V and load dump transients exceeding 40V. Its internal 650mA switch can deliver up to 350mA of continuous output current. The LT8606 maintains a minimum dropout voltage of only 175mV (at 300mA) under all conditions, allowing the device to excel in situations such as automotive cold-crank. Spread spectrum frequency modulation and special design techniques enable low EMI operation, allowing the device to meet the CISPR 25 Class 5 EMI limits required by many automotive and industrial applications. In addition, a fast minimum on-time of only 45ns allows switching at a constant frequency of 2MHz from a 16V input to a 1.5V output. The LT8606's 2mm x 2mm 8-lead DFN or 10-lead thermally enhanced MSOP packages and high switching frequency allow the use of small external inductors and capacitors, resulting in a compact and thermally efficient solution footprint.

The LT8606 uses internal high-efficiency power switches on both the upper and lower tubes, integrating the necessary boost diode, oscillator, control and logic circuits in a single chip. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVP-P. Unique design techniques and new high-speed processes enable the device to achieve high efficiency over a wide input voltage range, while the LT8606's current mode topology achieves fast transient response and excellent loop stability. Other features include internal compensation, power good flag, output soft start/tracking and overtemperature protection.

The LT8606EDC is available in a 2mm x 2mm 8-lead DFN package, and the LT8606EMSE is available in a thermally enhanced MSOP-10 package. Industrial temperature grade versions, the LT8606IDC and LT8606IMSE, are tested and guaranteed to operate over the –40°C to 125°C operating junction temperature range. Pricing starts at $2.05 each in 1,000-piece quantities, and both versions are available from stock.

Photo Caption: 42V, 350mA, 2.2MHz Synchronous Step-Down DC/DC Converter Operates from 3.0V to 42V

Performance Summary: LT8606

Wide input voltage range: 3.0V to 42V

Ultra-low quiescent current Burst Mode operation:

o<3µA IQ (Regulates 12VIN to 3.3VOUT)

oOutput ripple <10mVP-P

High efficiency 2MHz synchronous operation:

oEfficiency>92% (at 0.35A, 5VOUT from 12VIN)

350mA maximum continuous output

Fast minimum switch on time: 45ns

Adjustable and syncable: 200kHz to 2.2MHz

Spread spectrum frequency modulation for low EMI

Allows the use of small inductors

Low pressure drop

Peak current mode operation

Accurate 1V enable pin threshold

Internal compensation

Output soft-start and tracking

Tiny 2mm x 2mm 8-lead DFN or 10-lead MSOP package

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