The LTC1751 is a micropower, regulated charge pump DC/DC converter that produces a regulated output voltage at up to 100mA. The input voltage range is 2V to 5.5V. Extremely low operating current (20µA typical with no load) and low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, battery-powered applications. The LTC1751 family operate as Burst ModeTM switched capacitor voltage doublers to achieve ultralow quiescent current. They have thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. The PGOOD pin on the LTC1751-3.3 and LTC1751-5 indicates when the output voltage has reached its final value and if the output has an undervoltage fault condition. The FB pin
The LTC1751, LTC1751‑3.3 and LTC1751‑5 are micropower charge‑pump DC/DC converters that provide regulated output voltages up to 100 mA. They operate from 2 V to 5.5 V input and feature ultralow quiescent current (≈20 µA) and a simple external component count.
Typical applications include lithium‑ion battery backup, local 3 V/5 V conversion, smart‑card readers, PCMCIA supplies, and white‑LED backlighting. The devices include short‑circuit and thermal shutdown protection, a PGOOD status pin, and optional soft‑start programming.
| 5 V Output Current | 100 mA |
|---|---|
| 3.3 V Output Current | 80 mA |
| Quiescent Current | 20 µA typical |
| Switching Frequency | 800 kHz |
| Input Voltage Range | 2 V to 5.5 V |
| Shutdown Current | < 2 µA |
| Package | 8‑pin MSOP |
The typical quiescent current is about 20 µA with no load.
The devices operate at a switching frequency of 800 kHz.
The LTC1751 includes short‑circuit protection and thermal shutdown capability.