MAX840ESA - Brand New Maxim Integrated Special Purpose Voltage Regulators
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Description
The MAX840ESA is a low-noise, inverting charge-pump power supply that is specifically designed for biasing GaAsFETs in cellular telephone transmitter amplifiers. It provides a fixed output voltage of -2V or an adjustable output voltage range of -0.5V to -9.4V at 4mA. The input voltage range for this component is 2.5V to 10V, and it can operate with small capacitors as low as 0.22µF. The MAX840ESA ensures a low output voltage ripple of 1mVp-p and has a charge-pump switching frequency of 100kHz in normal operation and 20kHz in shutdown mode (MAX844). It also features a logic-level shutdown over temperature with a maximum current of 1µA. This component is available in a small 8-pin SO package.
Specifications and features
- Output Voltage: Fixed -2V or Adjustable -0.5V to -9.4V
- Output Current: 4mA
- Input Voltage Range: 2.5V to 10V
- Capacitor Compatibility: as low as 0.22µF
- Output Voltage Ripple: 1mVp-p
- Charge-Pump Switching Frequency:
- Normal Operation: 100kHz
- Shutdown Mode (MAX844): 20kHz
- Logic-Level Shutdown Current (MAX840/MAX843): 1µA (max) over temperature
- Package: Small 8-Pin SO
Application Scenarios
The MAX840ESA is commonly used in the following applications:
- Cellular Phones
- GaAsFET Power Amplifier Modules
- Personal Communicators, PDAs
- Wireless Data Loggers
- Continuously Adjustable GaAsFET Bias
- LCD-Bias Contrast Control
- Regulated Negative Power Supplies
Comparison
The advantages and disadvantages of the MAX840ESA are:
Advantages- Low-noise power supply specifically designed for biasing GaAsFETs
- Wide input voltage range and small capacitor compatibility
- Low output voltage ripple
- Logic-level shutdown with low current consumption over temperature
- Compact and convenient 8-pin SO package
Disadvantages- Fixed output voltage may not be suitable for all applications
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Similar parts: 1605 , Click to view
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Datasheet
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Shopping guide
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Popular parts of the same kind
- Datasheet: Download MAX840ESA
- Chipdatas Part: CD89-MAX840ESA
- Warehouse: China, Hong Kong
- Dispatch: Within 24 hours
- Free Shipping: Yes
- Prority Shipping: Yes, 3-5 days
- Last Updated: 2024/10/01 20:32 +0800
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