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2.5MHz/1.5MHz Step-Down Converters with 60mΩ Bypass in TDFN for CDMA PA Power

Overall Smallest Solution 1.5MHz Step-Down DC-DC Converters Deliver 600mA with Up to 94% Efficiency in a Small TDFN Package

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.4
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.6
Switch Type Internal
Output Adjust. Method Dyn. REF In
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2500
Package/Pins TDFN/10
Budgetary
Price (See Notes)
2.2
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.4
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.6
Switch Type Internal
Output Adjust. Method Dyn. REF In
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2500
Package/Pins TDFN/10
Budgetary
Price (See Notes)
2.2

Key Features

  • 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

Applications/Uses

  • WCDMA/NCDMA Cell Phones
  • Wireless PDAs, Smartphones

Description

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).

Simplified Block Diagram

MAX8581, MAX8582: Typical Operating Circuit MAX8581, MAX8582: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.