MP20043 –DUAL-CHANNEL, 300mA LDO WITH PROGRAMMABLE OUTPUT VOLTAGE
OPERATION
The MP20043 integrates two low noise, low
dropout, low quiescent current and high PSRR
linear regulators. It is intended for use in
devices that require very low voltage, low
quiescent current power such as wireless LAN,
battery-powered equipment and hand-held
equipment. Output voltages are optional
ranging from 1.2V to 3.3V, and each channel
can supply current up to 300mA. The part uses
internal PMOSs as the pass elements and
features internal thermal shutdown and internal
current limit circuits.
tied to VIN to keep the regulator output always
on if the application does not require the
shutdown feature. Do not float the EN pins.
Current Limit
The MP20043 includes two independent current
limit structures which monitor and control each
PMOS’s gate voltage limiting the guaranteed
maximum output current to 490mA.
Thermal Protection
Thermal protection turns off the PMOS when
the junction temperature exceeds +140ºC,
allowing the IC to cool. When the IC’s junction
temperature drops by 10ºC, the PMOS will be
turned on again. Thermal protection limits total
power dissipation in the MP20043. For reliable
operation, the junction temperature should be
limited to 125 ºC maximum.
Dropout Voltage
Dropout voltage is the minimum input to output
differential voltage required for the regulator to
maintain an output voltage within 100mV of its
nominal value. Because the PMOS pass
element behaves as a low-value resistor, the
dropout voltage of MP20043 is very low.
Internal P-Channel Pass Device
The MP20043 features dual typical 0.6ꢀ P-
channel MOSFET pass devices. It provides
several advantages over similar designs using
PNP pass transistors, including longer battery
life.
Shutdown
The MP20043 has two EN pins to control each
channel respectively. And each channel can be
switched ON or OFF by a logic input at the EN
pin. A high voltage at this pin will turn the
device on. When the EN pin is low, the
regulator output is off. The EN pin should be
MP20043 Rev.0.91
10/10/2011
www.MonolithicPower.com
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