MAX8582

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


Please check latest availability status for a specific part variant.

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).

MAX8581, MAX8582: Typical Operating Circuit MAX8581, MAX8582: Typical Operating Circuit Enlarge+

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

See parametric specs for Step-Down Switching Regulators (404)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Switch TypeSynchronous SwitchingOper. Freq.
(kHz)
FeaturesPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX8581 2.75.50.450.6InternalYes2500
Adjustable Freq.
Current Limit
Fixed Freq./PWM
TDFN/10
$1.76 @1k
MAX8582 1500
TDFN/10

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX8582EVKIT: MAX8582 Evaluation Kit
Request Reliability Report for: MAX8582 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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    Type ID Title
    Evaluation Board5397MAX8582EVKIT MAX8582 Evaluation Kit