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LM3203 データシート(PDF) 11 Page - Texas Instruments

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部品番号 LM3203
部品情報  Step-Down DC-DC Converter
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM3203 データシート(HTML) 11 Page - Texas Instruments

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MOSFET
CONTROL
LOGIC
OSCILLATOR
SHUTDOWN
CONTROL
PWM
COMP
FB
VCON
EN
PGND
PVIN
SW
SGND
VDD
BYP
ERROR
AMPLIFIER
~
CURRENT
SENSE
MAIN CONTROL
0.15V
VCON Low Voltage
DETECTOR
OVP
COMP
BYPOUT
LM3203
www.ti.com
SNVS355D – MAY 2005 – REVISED APRIL 2013
BLOCK DIAGRAM
OPERATION DESCRIPTION
The LM3203 is a simple, step-down DC-DC converter with a bypass switch, optimized for powering RF power
amplifiers (PAs) in mobile phones, portable communicators, and similar battery powered RF devices. It is
designed to allow the RF PA to operate at maximum efficiency over a wide range of power levels from a single
Li-Ion battery cell. It is based on current-mode buck architecture, with synchronous rectification for high
efficiency. It is designed for a maximum load capability of 500mA. Maximum load range may vary from this
depending on input voltage, output voltage and the inductor chosen.
The device has all three of the pin-selectable operating modes required for powering RF PAs in mobile phones
and other sophisticated portable device with complex power management needs. Fixed-frequency PWM
operation offers regulated output at high efficiency while minimizing interference with sensitive IF and data
acquisition circuits. Bypass mode turns on an internal FET bypass switch to power the PA directly from the
battery. This helps the RF power amplifier maintain its operating power during low battery conditions by reducing
the dropout voltage across the LM3203. Shutdown mode turns the device off and reduces battery consumption to
0.1µA (typ.).
DC PWM mode output voltage precision is +/-2% for 1.2VOUT. Efficiency is typically around 96% for a 150mA
load with 3.2V output, 3.6V input. PWM mode quiescent current is 0.675 mA (typ.). The FB pin voltage is
dynamically programmable from 0.267V to 1.2V by adjusting the voltage on the VCON. External divider resistors
can change the output voltge range. This ensures longer battery life by being able to change the PA supply
voltage dynamically depending on its transmitting power.
Additional features include current overload protection, over voltage protection and thermal shutdown.
The LM3203 is constructed using a chip-scale 10-pin DSBGA package. This package offers the smallest
possible size, for space-critical applications such as cell phones, where board area is an important design
consideration. Use of a high switching frequency (2MHz typ.) reduces the size of external components. Use of a
DSBGA package requires special design considerations for implementation. (See DSBGA Package Assembly
and Use section.) Its fine bump-pitch requires careful board design and precision assembly equipment. Use of
this package is best suited for opaque-case applications, where its edges are not subject to high-intensity
ambient red or infrared light. Also, the system controller should set EN low during power-up and other low supply
voltage conditions. (See Shutdown Mode section.)
Copyright © 2005–2013, Texas Instruments Incorporated
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