LTC1758-1 - RF Power Controllers with 250kHz Control Loop Bandwidth and 40dB Dynamic Range


  • Dual Band RF Power Amplifier Control (LTC1758-2)
  • Internal Schottky Diode Detector with Improved Dynamic Range vs LTC1757A
  • Wide Input Frequency Range: 850MHz to 2GHz
  • 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
  • 250kHz Control Loop Bandwidth
  • Fast Acquire After Transmit Enable
  • Internal Frequency Compensation
  • Rail-to-Rail Power Control Outputs
  • Power Control Signal Overvoltage Protection
  • Low Operating Current: 1mA
  • Very Low Shutdown Current: <1µA
  • Available in 8-PIn MSOP (LTC1758-1)
    and 10-Pin MSOP (LTC 1758-2) Packages
  • Improved Start Voltage Accuracy
  • Improved PCTL Input Filtering
  • Pin Compatible with LTC1757A-X

Typical Application

LTC1758-1 Typical Application


The LTC1758-2 is a dual band RF power controller for RF power amplifiers operating in the 850MHz to 2GHz range. The loop bandwidth reduction to 250kHz improves frequency stability when controlling slow turn-on PAs such as the Philips BGY280, Conexant RM009/CX77302, Anadigics AWT6102/AWT6107 and the Hitachi PF08107/PF08123B.

The LTC1758-1 is a single output RF power controller that is identical in performance to the LTC1758-2 except that one output (VPCA) is provided. The LTC1758-1 can be used to drive a single RF or dual channel module with integral multiplexer. This part is available in an 8-pin MSOP package.

RF power is controlled by driving the RF amplifier power control pins and sensing the resultant RF output power via a directional coupler. 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 RF power amplifier is protected against high supply current and high power control pin voltages.

Internal and external offsets are cancelled over temperature by an autozero control loop, allowing accurate low power programming. The shutdown feature disables the part and reduces the supply current to <1µA.


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
LTC1758-1EMS8#PBF MS-8 MS8 E 05-08-1660 Yes
LTC1758-1EMS8#TRPBF MS-8 MS8 E 05-08-1660 Yes
LTC1758-2EMS#PBF MS-10 MS E 05-08-1661 Yes
LTC1758-2EMS#TRPBF MS-10 MS E 05-08-1661 Yes

LTC1758-1 Package Drawing
LTC1758-1 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
LTC1758-1EMS8#PBF MS-8 E $1.95 $1.65 Yes
LTC1758-1EMS8#TRPBF MS-8 E $1.70 Yes
LTC1758-2EMS#PBF MS-10 E $2.03 $1.70 Yes
LTC1758-2EMS#TRPBF MS-10 E $1.75 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.

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