MAX17502 Synchronous Step-Down DC/DC Converter

The MAX17502 is a high-efficiency, high-voltage, synchronous step-down DC-DC converter that operates over a 4.5V to 60V input voltage range and is designed for a wide range of applications. Ultra-wide input operation makes it ideal not only for industrial control and building automation, but also for base stations, home entertainment, telecommunications, and automotive applications. It provides up to 1A of output current over temperature with an output voltage of 3.3V and 5V. The output voltage range is accurate to ±1.6% over temperature. The device operates over the -40°C to +125°C industrial temperature range and is available in a tiny, 10-pin (3mm x 2mm) TDFN lead (Pb) free package with an exposed pad. The device features peak pulse-width modulation (PWM) current-mode control. PWM operation ensures a constant switching frequency under all operating conditions. Low-resistance, on-chip, PMOS/NMOS switches ensure high efficiency at full load while minimizing critical inductance, making layout a simpler task compared to discrete solutions. The device offers a fixed switching frequency of 600kHz. To reduce input inrush current, the device provides a soft-start function with an adjustable voltage to ground on the SS pin with an external capacitor. The device also integrates an output enable/undervoltage lockout pin (EN/UVLO) function that allows the user to turn on the part at the desired input voltage level. The open-drain, active-low RESET pin provides a delayed power-good signal when the system achieves successful output voltage regulation. The device supports low-power hiccup mode current limiting, overload, and output short-circuit protection.

Key Features

Eliminate external components and reduce overall cost

No Schottky synchronous operation for high efficiency and reduced cost

Internal compensation in ultra-compact layout

All Ceramic Capacitors

DC-DC regulators reduce stock quantities

Wide operating voltage range from 4.5V to 60V

Fixed 3.3V and 5V output

Delivers up to 1A over temperature range

600kHz switching frequency

Reduce power consumption

Maximum efficiency > 90%

Shutdown current 1μA (typical)

Reliable operation in harsh industrial environments

Hiccup Mode Current Limit and Auto-Restart

Built-in monitoring output voltage (open drain, active low RESET pin)

Resistor Programmable UVLO Threshold

With adjustable soft-start and pre-bias supply, maximum safety

Optional adjustable output and PFM (available upon factory request)

-40°C to +125°C industrial temperature range