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ML4790CS Datasheet(PDF) 1 Page - Micro Linear Corporation

Part # ML4790CS
Description  Adjustable Output, Low Ripple Boost Regulator
Download  10 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4790CS Datasheet(HTML) 1 Page - Micro Linear Corporation

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July 2000
ML4790
*
Adjustable Output, Low Ripple Boost Regulator
FEATURING
Extended
Commercial
Temperature
Range
–20°C
to 70°C
for Portable
Handheld
Equipment
BLOCK DIAGRAM
1
GENERAL DESCRIPTION
The ML4790 is a high efficiency, PFM (Pulse Frequency
Modulation), boost switching regulator connected in
series with an integrated LDO (Low Dropout Regulator)
that incorporates “Silent Switcher™” technology. This
technique incorporates a patented tracking scheme to
minimize the voltage drop across the LDO and increase
the total efficiency of the regulator beyond that which can
be obtained by using a discrete external LDO regulator.
The ML4790 is designed to convert single or multiple cell
battery inputs to regulated output voltages for integrated
circuits and is ideal for portable communications
equipment that cannot tolerate the output voltage ripple
normally associated with switching regulators.
An integrated synchronous rectifier eliminates the need for
an external Schottky diode and provides a lower forward
voltage drop, resulting in higher conversion efficiency.
(* Indicates Part is End Of Life as Of July 1, 2000)
FEATURES
s
Incorporates “Silent Switcher™” technology to deliver
very low output voltage ripple (typically 5mV)
s
Guaranteed full load start-up and operation at 1.0V
input and low operating quiescent current (<100
µA)
for extended battery life
s
Pulse Frequency Modulation and internal synchronous
rectification for high efficiency
s
Minimum external components
s
Low ON resistance internal switching MOSFETs
s
Adjustable output voltage (2.5V to 5.5V)
Patent Pending
*Optional
BOOST
CONTROL
4
8
2
1
6
L1
SHDN
VIN
GND
FEEDBACK
VL
+
–
VOUT
PWR
GND
FROM
POWER
MANAGEMENT
*CIN
VBAT
7
LDO
CONTROL
5
VBOOST
C2
VOUT
3
SENSE
R1
R2
COUT
VOUT
CFB


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