+2.8V, Single-Supply, Cellular-Band Linear Power Amplifier

Ultra-Low-Cost Cellular Band Power Amplifier Optimized for TDMA applications measures only 2mm x 2mm

Please check latest availability status for a specific part variant.


The MAX2251 low-voltage linear power amplifier (PA) is designed for TDMA/AMPS dual-mode phone applications. The device is packaged in an ultra-compact (2.06mm x 2.06mm) chip-scale package (CSP), and delivers over +30dBm of linear power in TDMA operation. An on-chip shutdown feature reduces operating current to 1µA (typ), eliminating the need for an external supply switch.

The MAX2251 does not need an external reference voltage, and requires only a few external matching components and no bias circuitry. Another feature of this device is the use of external bias resistors, eliminating wasted "safety-margin" current. This feature also allows current throttleback at lower output power levels, thereby maintaining the highest possible efficiency at all power levels.
MAX2251: Typical Operating Circuit MAX2251: Typical Operating Circuit Enlarge+

Key Features

  • Ultra-Compact 4 x 4 (2.06mm x 2.06mm) CSP
  • High Efficiency—41% at +30dBm POUT (TDMA) (typ)
  • On-Chip Power Detector
  • ICC < 1µA in Shutdown Mode
  • +2.8V to +4.5V True Single-Supply Operation
  • ±0.9dB Gain Variation from TA = -40°C to +85°C
  • Current Adjustable with PDM or DAC signal
  • No External Logic Interface Circuitry Required


  • 2-Way Pagers
  • Cellular-Band TDMA/AMPS Dual Mode™ Phones
  • Cordless Phones
  • PA Modules

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
App Note 335 Maxim Wireless/RF Power Amplifier Selector Guide

Quality and Environmental Data

Request Reliability Report for: MAX2251 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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