SNWS014D March   2004  – June 2025 LMV242 , LMV2421

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Electrical Characteristics for 2.6V
    4. 5.4 Electrical Characteristics for 5V
    5. 5.5 Timing Diagram
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Functional Block Diagram
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Power-Control Principles
      2. 7.1.2 Power Amplifier Controlled Loop
        1. 7.1.2.1 General Overview
        2. 7.1.2.2 Typical PA Closed Loop Control Setup
          1. 7.1.2.2.1 Power Control Over Wide Dynamic Range
      3. 7.1.3 Attenuation Between the Coupler and LMV242x Detector
      4. 7.1.4 Control of the LMV242x
        1. 7.1.4.1 VRAMP Signal
        2. 7.1.4.2 Transmit Enable
        3. 7.1.4.3 Band Select (LMV242 Only)
        4. 7.1.4.4 Analog Output
      5. 7.1.5 Frequency Compensation
    2. 7.2 Typical Application
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • NGY|10
Thermal pad, mechanical data (Package|Pins)
Orderable Information

3 Description

The LMV2421 and LMV242 (LMV242x) are single-output and dual-output power amplifier (PA) controllers. These devices are intended for use within an RF transmit power control loop for RF PA control, and in GSM and GPRS mobile phones. The LMV242x support all single-supply PAs, including InGaP, HBT, and bipolar power amplifiers. The devices operate with a single supply from 2.6V to 5.5V.

Included in the LMV2421 PA controller are a log RF detector, a ramp filter, and an output driver that functions as an error amplifier.

The dual-output LMV242 includes two selectable output drivers for control of two different PAs. The LMV2421 input interface consists of two analog and one digital inputs; two digital inputs for the LMV242. The analog inputs are the RF input and the ramp voltage input. The digital inputs perform the function of Shutdown/Transmit Enable and Band Select (LMV242 only). The LMV242x is active when TX_EN = high. When TX_EN = low, the device is in a low-power-consumption shutdown mode. During shutdown, the outputs are pulled low to the minimum output voltage. The Band Select (LMV242 only) function enables either of two outputs, namely OUT1 when BS = high, or output OUT2 when BS = low. The output that is not enabled is pulled low to the minimum output voltage. Individual PA characteristics are accommodated by a user-selectable external RC combination.

The LMV242x are offered in a 10-lead WSON package. The LMV242x are an excellent choice for small-footprint, PA modules systems.

Device Information
PART NUMBERCHANNEL COUNTPACKAGE(1)
LMV2421SingleNGY (WSON, 10)
3mm × 3mm(2)
LMV242 Dual
(1) For more information, see Section 10.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LMV242 LMV2421 Typical Applications Typical Applications