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LTC3539-2

Description
400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up
File Size2MB,18 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTC3539-2 Overview

400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up

LTC3105
400mA Step-Up DC/DC
Converter with Maximum Power
Point Control and 250mV Start-Up
FEATURES
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DESCRIPTION
The LTC
®
3105 is a high efficiency step-up DC/DC converter
that can operate from input voltages as low as 225mV. A
250mV start-up capability and integrated maximum power
point controller (MPPC) enable operation directly from low
voltage, high impedance alternative power sources such as
photovoltaic cells, TEGs (thermoelectric generators) and
fuel cells. A user programmable MPPC set point maximizes
the energy that can be extracted from any power source.
Burst Mode operation, with a proprietary self adjusting
peak current, optimizes converter efficiency and output
voltage ripple over all operating conditions.
The AUX powered 6mA LDO provides a regulated rail for
external microcontrollers and sensors while the main
output is charging. In shutdown, I
Q
is reduced to 10µA
and integrated thermal shutdown offers protection from
overtemperature faults. The LTC3105 is offered in 10-lead
3mm × 3mm × 0.75mm DFN and 12-lead MSOP packages.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Low Start-Up Voltage: 250mV
Maximum Power Point Control
Wide V
IN
Range: 225mV to 5V
Auxiliary 6mA LDO Regulator
Burst Mode
®
Operation: I
Q
= 24µA
Output Disconnect and Inrush Current Limiting
V
IN
> V
OUT
Operation
Antiringing Control
Soft Start
Automatic Power Adjust
Power Good Indicator
10-Lead 3mm × 3mm × 0.75mm DFN and 12-Lead
MSOP Packages
APPLICATIONS
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Solar Powered Battery/Supercapacitor Chargers
Energy Harvesting
Remote Industrial Sensors
Low Power Wireless Transmitters
Cell Phone, MP3, PMP and GPS Accessory Chargers
TYPICAL APPLICATION
Single Photovoltaic Cell Li-Ion Trickle Charger
10µH
225mV TO 5V
PHOTOVOLTAIC
CELL
80
70
V
OUT
4.1V
1020k
FB
MPPC
OFF ON
40.2k
1µF
SHDN
AUX
GND
PGOOD
LDO
FBLDO
4.7µF
3105 TA01a
Output Current vs Input Voltage
MPPC DISABLED
V
OUT
= 3.3V
10µF
LTC3105
V
OUT
OUTPUT CURRENT (mA)
+
V
IN
SW
60
50
40
30
20
10
0
0.2
0.3
V
OUT
= 4.2V
Li-Ion
332k
2.2V
10µF
V
OUT
= 5V
0.4 0.5 0.6 0.7 0.8
INPUT VOLTAGE (V)
0.9
1.0
3105 TA01b
3105fa
1
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