The LM2734Z/LM2734ZQ Thin SOT23 1A Load Step-Down DC-DC Regulator is a monolithic, high frequency, PWM step-down DC/DC converter assembled in a 6-pin Thin SOT23 and LLP non pull back 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 LM2734Z 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 re- sults in the best power density available. The world class control circuitry allows for on-times as low as 13ns, thus sup- porting exceptionally high frequency conversion over the en- tire 3V to 20V input operating range down to the minimum output voltage of 0.8V. Switching frequency is internally set to 3MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating fre- quency is very high, efficiencies up to 85% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2734Z utilizes current-mode control and internal compensation to provide high-perfor- mance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to re- duce inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.
The LM2734Z is a monolithic, high‑frequency PWM step‑down DC‑DC converter offered in a 6‑pin Thin SOT23 or LLP package. It provides 1 A load capability, 3 MHz switching, and a shutdown current of only 30 nA, enabling high power density in a small PCB footprint.
Key features include a 3 V‑20 V input range, 0.8 V‑18 V output range, internal soft‑start, current‑mode control, thermal shutdown, and over‑voltage protection. The device is qualified to AEC‑Q100 Grade 1 for automotive applications and is supported by TI’s WEBENCH design tool.
| Input voltage range | 3 V to 20 V |
|---|---|
| Output voltage range | 0.8 V to 18 V |
| Maximum output current | 1 A |
| Switching frequency | 3 MHz |
| Shutdown (quiescent) current | 30 nA |
| Internal voltage reference | 0.8 V ±2 % |
| Thermal shutdown temperature | 165 °C |
| Package types | Thin SOT23‑6 or 6‑lead LLP |
The LM2734Z operates at an internally set switching frequency of 3 MHz.
In shutdown mode the device draws about 30 nA of standby current.
The regulator accepts an input voltage from 3 V up to 20 V.
The output voltage is set by connecting the FB pin to an external resistor divider.