The NCP1526 is a high-efficiency step-down converter with a 3 MHz switching frequency and a maximum output current of 400 mA. The device uses synchronous rectification technology to improve efficiency and eliminate external Schottky diodes. The device also includes a 3.0 MHz (nominal) oscillator that reduces component size by allowing the use of small inductors (down to 1 mH) and capacitors. Other features include integrated soft-start, cycle-by-cycle current limiting, and thermal shutdown protection. The integrated ultra-low noise, low dropout regulator has 150 mA current capability, current limiting, and temperature limit protection. The NCP1526 is available in a space-saving, ultra-low profile 3x3 mm, 10-pin UDFN package (maximum thickness 0.55 mm).
The NCP1526 is a monolithic integrated circuit that combines a high‑efficiency step‑down PWM DC‑DC converter with a low‑noise, low‑dropout voltage regulator. It is intended for RF‑sensitive portable applications powered by a single Li‑ion or three alkaline/NiCd/NiMH cells, offering up to 400 mA output current for the buck converter and 150 mA for the LDO.
Key data include a 2.7‑5.2 V input range, 3 MHz switching frequency, up to 94 % efficiency, and a compact 3 mm × 3 mm × 0.55 mm 10‑pin UDFN package. The document lists electrical characteristics, maximum ratings, pin descriptions, typical applications, and ordering information.
| Output Current Capability (DC/DC) | 400 mA |
|---|---|
| Switching Frequency | 3.0 MHz |
| Efficiency | up to 94 % (85 % at 1.2 V) |
| LDO Fixed Output Voltage | 2.8 V (available now) |
| LDO Output Current Capability | 150 mA |
| Package Size | 3 mm × 3 mm × 0.55 mm UDFN (10‑pin) |
| Thermal Resistance (J‑A) | 240 °C/W |
| Operating Ambient Temperature Range | -40 °C to 85 °C |
The LDO can supply up to 150 mA of output current.
It is offered in a 3 mm × 3 mm × 0.55 mm 10‑pin UDFN package.
The converter can achieve up to 94 % efficiency (85 % at 1.2 V).