Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers - LM3200

LM3200 (ACTIVE)

Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers

Description

The LM3200 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage of 2.7V to 5.5V to a variable output voltage of 0.8V to 3.6V. The output voltage is set using an analog input ( VCON) for optimizing efficiency of the RF PA at various power levels.

The LM3200 offers superior features and performance for mobile phones and similar RF PA applications. Fixed-frequency PWM mode minimizes RF interference. Bypass mode turns on an internal bypass switch to power the PA directly from the battery. LM3200 has both forced and automatic bypass modes. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typ.). The LM3200 is available in a 10-pin lead free DSBGA package. A high switching frequency (2 MHz) allows use of tiny surface-mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors are required.

Features

  • 2 MHz (typ.) PWM Switching Frequency
  • Operates from a Single Li-Ion Cell (2.7V to 5.5V)
  • Variable Output Voltage (0.8V to 3.6V)
  • 300 mA Maximum Load Capability (PWM Mode)
  • 500 mA Maximum Load Capability (Bypass Mode)
  • PWM, Forced and Automatic Bypass Mode
  • High Efficiency (96% Typ at 3.6VIN, 3.2VOUT at 120 mA) from Internal Synchronous Rectification
  • 10-pin DSBGA Package
  • Current Overload Protection
  • Thermal Overload Protection

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Parametrics Compare all products in RF DC/DC Converter

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Topology
Bypass
Switching Frequency (Typ) (kHz)
Special Features
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM3200
2.7    
5.5    
0.8    
3.6    
0.5    
Buck    
Bypass    
2000    
Adjustable Output    
-25 to 85    
10DSBGA    
1.60 | 1ku    

Companion parts

Part # Name Product Family Comments
LMV221   50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA   Broadband RF/IF - RF POWER DETECTOR    50 MHz - 3.5 GHz, 40dB, RF Transmit Power Detector  
LMV225   RF Power Detector for CDMA and WCDMA in micro SMD   Broadband RF/IF - RF POWER DETECTOR    450 MHz - 2 GHz, 30dB, RF Transmit Power Detector  
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