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Charge Pumps 
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MAX889
High-Frequency, Regulated, 200mA, Inverting Charge Pump
Regulated Inverting Charge Pump Delivers 200mA for Negative Supply without Inductors
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The MAX889 inverting charge pump 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.
Key Features
- 200mA Output Current
- Up to 2MHz Switching Frequency
- Small Capacitors (1µF)
- +2.7V to +5.5V Input Voltage Range
- Adjustable Regulated Negative Output (-2.5V to -VIN)
- 0.1µA Logic-Controlled Shutdown
- Low 0.05Ω Output Resistance (in regulation)
- Soft-Start and Foldback Current Limited
- Short-Circuit and Thermal Shutdown Protected
- 8-Pin SO Package
Applications/Uses
- Battery-Powered Applications
- Camcorders
- Digital Still Cameras
- Hard Disk Drive
- Measurement Instrumentation
- TFT Panels
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