7.1 Overview

The LM76002-Q1/LM76003-Q1 regulator is an easy-to-use synchronous step-down DC-DC converter that operates from 3.5-V to 60-V supply voltage. The device is capable of delivering up to 2.5-A or 3.5-A DC load current with exceptional efficiency and thermal performance in a very small solution size.

The LM76002-Q1/LM76003-Q1 employs fixed-frequency peak-current-mode control with configurable discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) mode at light load to achieve high efficiency across the load range. The device can also be configured as forced-PWM (FPWM) operation to keep constant switching frequency over the load range. The device is internally compensated, which reduces design time and requires fewer external components. The switching frequency is programmable from 300 kHz to 2.2 MHz by an external resistor. The LM76002-Q1/LM76003-Q1 is also capable of synchronization to an external clock operating within the 300-kHz to 2.2-MHz frequency range. The wide switching frequency range allows the device to meet a wide range of design requirements. It can be optimized to very small solution size with higher frequency or to very high efficiency with lower switching frequency. It has very small minimum HS MOSFET on-time (t_ON-MIN) and minimum off-time (t_OFF-MIN) to provide wide range of voltage conversion. Automated frequency foldback is employed under t_ON-MIN or t_OFF-MIN condition to further extend the operation range.

The LM76002-Q1/LM76003-Q1 also features a power-good (PGOOD) flag, precision enable, internal or adjustable soft-start rate, start-up with pre-bias voltage, and output voltage tracking. It provides a both flexible and easy-to-use solution for wide range of applications. Protection features include thermal shutdown, V_CC undervoltage lockout, cycle-by-cycle current limiting, and short-circuit hiccup protection.

The family requires very few external components and has a pinout designed for simple, optimum PCB layout for EMI and thermal performance. The LM76002-Q1/LM76003-Q1 device is available in a 30-pin WQFN lead-less package.