Overview
Features and Benefits
- 600mA Step-Down Converter
- 60mΩ (typ) Bypass Mode with Integrated FET
- Dynamically Adjustable Output from 0.4V to VIN
- 2.5MHz and 1.5MHz Switching Frequency
- Small LC Components: 1.5µH to 3.3µH and 2.2µF
- Up to 94% Efficiency
- Low Output Ripple at All Loads
- 2.7V to 5.5V Input
- 0.1µA Shutdown Mode
- Output Short-Circuit Protection
- Thermal Shutdown
- 10-Pin, 3mm x 3mm TDFN Packages
Product Details
The MAX8581/MAX8582 high-frequency step-down converters are optimized for dynamically powering the power amplifier (PA) in CDMA handsets. They integrate a high-efficiency PWM step-down converter for medium- and low-power transmission and a 60mΩ (typ) bypass mode to power the PA directly from the battery during high-power transmission. They use an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The MAX8581/MAX8582 use an internal feedback network, and the switching frequency is internally set to 2.5MHz and 1.5MHz, respectively.
Fast switching (up to 2.5MHz) and fast soft-start allowthe use of ceramic 2.2µF input and output capacitors while maintaining low voltage ripple. The small 1.5µH to 3.3µH inductor size can be optimized for efficiency.
The MAX8581/MAX8582 are available in 10-pin, 3mm x3mm TDFN packages (0.8mm max height).
Applications
- WCDMA/NCDMA Cell Phones
- Wireless PDAs, Smartphones
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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