The LMR10510 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in
a 5-pin SOT-23 and a 6-pin WSON package. It provides all the active functions to provide local
DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB
area. The LMR10510 is internally compensated, so it is simple to use and requires few external
components. The ability to drive 1-A loads with an internal 130-mΩ PMOS switch results in the best
power density available. The world-class control circuitry allows on-times as low as 30 ns, thus
supporting exceptionally high frequency conversion over the entire 3-V to 5.5-V input operating
range down to the minimum output voltage of 0.6 V.
The LMR10510 is a constant frequency PWM buck regulator IC that delivers a 1-A load
current. The regulator has a preset switching frequency of 1.6 MHz or 3 MHz. This high frequency
allows the LMR10510 to operate with small surface mount capacitors and inductors, resulting in a
DC/DC converter that requires a minimum amount of board space. Even though the operating frequency
is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an
ultra-low stand-by current of 30 nA. The LMR10510 utilizes current-mode control and internal
compensation to provide high-performance regulation over a wide range of operating conditions.
Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse
current limit, thermal shutdown, and output overvoltage protection.