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LT3495BEDDB-TRPBF

Description
650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect
File Size322KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT3495BEDDB-TRPBF Overview

650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect

FEATURES
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LT3495/LT3495B/
LT3495-1/LT3495B-1
650mA/350mA Micropower
Low Noise Boost Converter
with Output Disconnect
DESCRIPTION
The LT
®
3495/LT3495B/LT3495-1/LT3495B-1 are low noise
boost converters with integrated power switch, feedback
resistor and output disconnect circuitry. The parts control
power delivery by varying both the peak inductor current
and switch off-time. This novel* control scheme results
in low output voltage ripple as well as high efficiency
over a wide load range. For the LT3495/LT3495-1, the
off-time of the switch is not allowed to exceed a fixed
level, guaranteeing the switching frequency stays above
the audio band for the entire load range. The parts feature
a high performance NPN power switch with a 650mA
and 350mA current limit for the LT3495/LT3495B and
LT3495-1/LT3495B-1 respectively. The quiescent current
is a low 60μA, which is further reduced to 0.1μA in shut-
down. The internal disconnect circuitry allows the output
voltage to be isolated from the input during shutdown. An
auxiliary reference input (CTRL pin) overrides the internal
1.235V feedback reference with any lower value allowing
full control of the output voltage during operation. The
LT3495 series are available in a tiny 10-lead 3mm
×
2mm
DFN package.
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Low Quiescent Current
60μA in Active Mode
0.1μA in Shutdown Mode
Low Noise Control Scheme (Switching Frequency
Always Stays Above Audible Range for LT3495/-1)
Integrated Power NPN:
650mA Current Limit (LT3495/B)
350mA Current Limit (LT3495-1/B-1)
Integrated Output Disconnect
Integrated Output Dimming
Wide input range: 2.3V to 16V
Wide output range : Up to 40V
Integrated feedback resistor
Tiny 10-Lead 3mm
×
2mm DFN Package
APPLICATIONS
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OLED Power
Low Noise Power
MP3 Player
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. *Patent pending.
TYPICAL APPLICATION
OLED Power Supply from One Li-Ion Cell
V
OUT
PEAK-TO-PEAK RIPPLE (mV)
ONE
Li-Ion
CELL
10μH
4.7μF
SW
V
CC
SHDN
CTRL
CAP
V
OUT
909k
FB
GND
3495 TA01a
Output Voltage Ripple
vs Load Current
50
1.0μF 0603
CAPACITOR AT V
OUT
EFFICIENCY (%)
90
Efficiency vs Load Current
V
IN
= 3.6V
400
LOAD FROM CAP
LOAD FROM V
OUT
320
POWER LOSS (mW)
2.2μF
V
OUT
16V
70mA
1μF
40
80
LT3495
30
70
240
20
60
160
10
2.2μF 1206
CAPACITOR AT V
OUT
0
1
10
LOAD CURRENT (mA)
100
3495 TA01b
50
80
0
40
0.1
1
10
LOAD CURRENT (mA)
0
100
3495 TA01c
3495b1b1f
1

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Description 650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect 650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect 650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect 650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect 650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect
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