DESCRIPTION

· The MAX5052/MAX5053 are current-mode PWM controllers designed for wide-input-voltage isolated and nonisolated power supplies.

· The MAX5052 is suitable for universal input (rectified 85VAC to 265VAC) or telecom (-36VDC to -72VDC) power supplies.

· The MAX5053 is ideal for low-input-voltage (10.8VDC to 24VDC) power supplies.

· Both devices feature an internal error amplifier for primary-side regulation, eliminating the need for an optocoupler.

· They include input undervoltage lockout (UVLO), digital soft-start, and thermal shutdown protection.

· The MAX5052 has an internal bootstrap UVLO with large hysteresis, requiring a minimum voltage of 23.6V for startup.

· The MAX5053 can be biased directly from a minimum voltage of 10.8V.

· Both devices operate at a fixed switching frequency of 262kHz ±12% and are available in 8-pin µMAX packages.

FEATURES

· Available in a tiny 8-pin µMAX package.

· Current-mode control for precise regulation.

· Supports up to 50W output power.

· Universal offline input voltage range (MAX5052).

· Directly driven from 10.8V to 24V input (MAX5053).

· Digital soft-start to reduce output voltage overshoot.

· Programmable input startup voltage.

· Internal bootstrap UVLO with large hysteresis (MAX5052).

· Internal error amplifier with 1% accurate reference.

· Thermal shutdown protection at +130°C.

· Low startup supply current (45µA typical).

· Low operating supply current (1.4mA typical).

· Fixed switching frequency of 262kHz ±12%.

· 50% or 75% maximum duty-cycle limit options.

· Fast cycle-by-cycle current-limit response time (60ns).

APPLICATIONS

· Universal input AC power supplies.

· Isolated telecom power supplies.

· Networking systems.

· Computer systems/servers.

· Industrial power conversion.

· Isolated keep-alive circuits.

· 12V boost regulators.

· 12V SEPIC regulators.