The MAX889 is a high-frequency, adjustable, 200mA inverting charge pump that delivers a regulated negative output voltage at loads of up to 200mA. The device operates with inputs from 2.7V to 5.5V to produce an adjustable, regulated output from -2.5V to -VIN. The MAX889 is available with an operating frequency of 2MHz (T version), 1MHz (S version), or 0.5MHz (R version). The higher switching frequency devices allow the use of smaller capacitors for space-limited applications. The lower frequency devices have lower quiescent current. The MAX889 also features a 0.1µA logic-controlled shutdown mode and is available in an 8-pin SO package. An evaluation kit, MAX889SEVKIT, is available.
The MAX889 is a high‑frequency, regulated inverting charge‑pump that delivers a negative output voltage up to –VIN while supplying up to 200 mA. It operates from a 2.7 V to 5.5 V input and is offered in three switching‑frequency versions (0.5 MHz, 1 MHz, 2 MHz) to suit space‑constrained designs.
Key features include a 0.1 pA logic‑controlled shutdown mode, soft‑start and fold‑back current limiting, short‑circuit and thermal shutdown protection, and an 8‑pin SO package. The document provides electrical characteristics, pin descriptions, layout recommendations, and component selection tables for capacitors and resistors.
| Maximum Output Current | 200 mA |
|---|---|
| Switching Frequency (max) | 2 MHz |
| Input Voltage Range | +2.7 V to +5.5 V |
| Output Voltage Range | -2.5 V to -VIN |
The MAX889 can supply up to 200 mA of output current.
It operates with an input voltage from +2.7 V to +5.5 V.