The LM2734 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT23 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. With a minimum of external components and online design support through WEBENCH®, the LM2734 is easy to use. The ability to drive 1A loads with an internal 300mΩ NMOS switch using state-of-the-art 0.5µm BiCMOS technology results in the best power density available. The world class control circuitry allows for on-times as low as 13ns, thus supporting exceptionally high frequency conversion over the entire 3V to 20V input operating range down to the minimum output voltage of 0.8V. Switching frequency is internally set to 550kHz (LM2734Y) or 1.6MHz (LM2734X), allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2734 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 over-voltage protection.
The LM2734 regulator is a monolithic, high‑frequency PWM step‑down converter packaged in a 6‑pin Thin SOT23‑6. It operates from a 3 V to 20 V input range and provides a selectable 0.8 V to 18 V output at up to 1 A load current. Features include internal soft‑start, pulse‑by‑pulse current limit, thermal shutdown, and an ultra‑low 30 nA shutdown current, making it suitable for space‑constrained designs.
Typical applications listed are battery‑powered devices, USB‑powered devices, DSL modems, notebook computers and automotive systems. The datasheet provides absolute maximum ratings, electrical characteristics, pin descriptions, typical performance curves, and a block diagram to aid designers in implementing the regulator with minimal external components.
| Input Voltage Range | 3 V to 20 V |
|---|---|
| Output Voltage Range | 0.8 V to 18 V |
| Maximum Output Current | 1 A |
| Switching Frequency | 550 kHz (LM2734Y) or 1.6 MHz (LM2734X) |
| Shutdown (stand‑by) Current | 30 nA |
| Internal Voltage Reference Accuracy | 2 % (typ) |
The device is rated for an input voltage up to 20 V.
In shutdown the regulator draws only 30 nA.
The LM2734Y version runs at 550 kHz, while the LM2734X version runs at 1.6 MHz.
It is supplied in a 6‑pin Thin SOT23‑6 package.