LTC4403 - Multiband RF Power Controllers for EDGE/TDMA


  • Supports AM Modulation in EDGE/TDMA (ANSI-136) Applications
  • Single Output RF Power Amplifier Control (LTC4403-1)
  • Dual Output RF Power Amplifier Control (LTC4403-2)
  • Internal Schottky Diode Detector with >40dB Range
  • Wide Input Frequency Range: 300MHz to 2.4GHz
  • Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets
  • Wide VIN Range: 2.7V to 6V
  • Allows Direct Connection to Battery
  • RF Output Power Set by External DAC
  • Internal Frequency Compensation
  • Rail-to-Rail Power Control Outputs
  • Low Operating Current: 1mA
  • Low Shutdown Current: <10µA
  • PCTL Input Filter
  • Available in a 8-Pin MSOP Package (LTC4403-1) and 10-Pin MSOP (LTC4403-2)

Typical Application

LTC4403 Typical Application


The LTC4403-2 is a multiband RF power controller for RF power amplifiers operating in the 300MHz to 2.4GHz range. The LTC4403-2 has two outputs to control dual TX PA modules with two control inputs. An internal sample and hold circuit enables the LTC4403-2 to be used with AM modulation via the carrier or PA supply. The input voltage range is optimized for operation from a single lithium-ion cell or 3x NiMH.

RF power is controlled by driving the RF amplifier power control pins and sensing the resultant RF output power. The RF sense voltage is peak detected using an on-chip Schottky diode. This detected voltage is compared to the DAC voltage at the PCTL pin to control the output power.

The LTC4403-1 is a single output RF power controller with identical performance to the LTC4403-2. The LTC4403-1 has one output to control a single TX PA or dual TX PA module with a single control input and is available in an 8-pin MSOP package.

Internal and external offsets are cancelled over temperature by an autozero control loop. The shutdown feature disables the part and reduces the supply current to <10µA.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4403-1EMS8#PBF MS-8 MS8 E 05-08-1660 Yes
LTC4403-1EMS8#TRPBF MS-8 MS8 E 05-08-1660 Yes
LTC4403-2EMS#PBF MS-10 MS E 05-08-1661 Yes
LTC4403-2EMS#TRPBF MS-10 MS E 05-08-1661 Yes

LTC4403 Package Drawing
LTC4403 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC4403-1EMS8#PBF MS-8 E $2.23 $1.60 Yes
LTC4403-1EMS8#TRPBF MS-8 E $1.66 Yes
LTC4403-2EMS#PBF MS-10 E $2.68 $1.90 Yes
LTC4403-2EMS#TRPBF MS-10 E $1.96 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

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Click here to view our complete list of demo boards


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