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ML4775 Arkusz danych(PDF) 1 Page - Micro Linear Corporation

Numer części ML4775
Szczegółowy opis  Adjustable Output Low Voltage Boost Regulator with Shutdown
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Producent  MICRO-LINEAR [Micro Linear Corporation]
Strona internetowa  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4775 Arkusz danych(HTML) 1 Page - Micro Linear Corporation

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PWR
GND
3
1
L1
VBAT
VIN
GND
VL
COUT
2
8
REGULATION
&
SHUTDOWN
CONTROL
FROM POWER
MANAGEMENT
FEEDBACK
5
VOUT
SHDN
6
BOOST
CONTROL
*CIN
VOUT
4
SENSE
R1
R2
CFF*
August 2000
ML4775
Adjustable Output Low Voltage
Boost Regulator with Shutdown
1
*Optional
BLOCK DIAGRAM
GENERAL DESCRIPTION
The ML4775 is a boost regulator designed for DC to DC
conversion in 1 to 3 cell battery powered systems. The
combination of BiCMOS process technology, internal
synchronous rectification, variable frequency operation,
and low supply current make the ML4775 ideal for 1 cell
applications. The ML4775 is capable of start-up with input
voltages as low as 1V, and the output voltage can be set
anywhere between 2.5V and 5.5V by an external resistor
divider connected to the SENSE pin.
Unlike regulators using external Schottky diodes, the
ML4775 isolates the load from the battery when the
SHDN pin is high. This is accomplished by an integrated
synchronous rectifier which eliminates the need for an
external Schottky diode and provides a lower forward
voltage drop, resulting in higher conversion efficiency.
In addition, low quiescent battery current and variable
frequency operation result in high efficiency even at light
loads. The ML4775 requires a minimum number of
external components to build a very small regulator circuit
capable of achieving conversion efficiencies in excess of
90%.
FEATURES
s
Guaranteed start-up and operation at 1V input
s
Pulse Frequency Modulation and Internal Synchronous
Rectification for high efficiency
s
Isolates the load from the input during shutdown
s
Minimum external components
s
Low ON resistance internal switching FETs
s
Micropower operation
s
Adjustable output voltage (2.5V to 5.5V)


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