Synchronous buck regulator for POL applications
Semtech
SC185 synchronous buck regulator
The SC185 synchronous buck regulator is suited for power-efficient POL regulation applications in storage, networking, communications, consumer, industrial and office automation equipment.
The 4A-output-current regulator offers programmable soft-start in a 3 x 3 x 0.6mm package.
The SC185 joins Semtech's existing platform of POL regulators, which includes a selection of output currents ranging from 0.5 to 4A.
The SC185 simplifies power-supply design by integrating the regulator, loop-compensation components, power MOSFETs and MOSFET drivers on one chip.
This high level of integration eliminates the need for external loop stabilisation components and programming resistors, allowing designers to easily drop the SC185 onto their PC board, minimising layout time and effort, with the added benefit of reducing the total board space requirements to a compact, 89mm2 overall solution footprint.
Additionally, the user-programmable soft start minimises inrush current to effectively manage overall system power drain.
With an operating efficiency up to 95 per cent, the SC185 also offers an automatic power-save (PSAVE) mode that maintains high efficiency during light loads.
The integrated low RDS(ON) MOSFETs, combined with the PSAVE feature, enable compliance with the low-standby power consumption requirements of global energy-efficiency regulations.
The SC185 POL regulator features a fixed, 1.5MHz PWM (pulse-width-modulation) switching frequency and accepts input voltages from 2.9 to 5.5V, with output voltages ranging from 1 to 3.3V.
The device also offers a 1uA shutdown current and high transient response, as well as a power-good indicator to prevent data corruption by holding the system controllers and EEPROM in reset mode until the IC meets known-good regulation.
A range of standard protection functions, including input under-voltage lockout, output over-voltage and current-limit protection, over-temperature protection and thermal shutdown are also featured.
The 4A SC185 joins Semtech's existing platform of POL regulators, which covers an expanding range of output currents, including the SC173 (3A) and SC174 (4A) Ecospeed regulators and the SC195 (500mA), SC202 (500mA), SC4626 (1A), SC189 (1.5A), SC283 (1.8A) and SC183C (2A) devices.
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