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Linear Technology Electronic Components Datasheet

LTC3105 Datasheet

400mA Step-Up DC/DC Converter

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LTC3105
400mA Step-Up DC/DC
Converter with Maximum Power
Point Control and 250mV Start-Up
FEATURES
n Low Start-Up Voltage: 250mV
n Maximum Power Point Control
n Wide VIN Range: 225mV to 5V
n Auxiliary 6mA LDO Regulator
n Burst Mode® Operation: IQ = 24µA
n Output Disconnect and Inrush Current Limiting
n VIN > VOUT Operation
n Antiringing Control
n Soft Start
n Automatic Power Adjust
n Power Good Indicator
n 10-Lead 3mm × 3mm × 0.75mm DFN and 12-Lead
MSOP Packages
APPLICATIONS
n Solar Powered Battery/Supercapacitor Chargers
n Energy Harvesting
n Remote Industrial Sensors
n Low Power Wireless Transmitters
n Cell Phone, MP3, PMP and GPS Accessory Chargers
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, IQ 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 and PowerPath are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Single Photovoltaic Cell Li-Ion Trickle Charger
10µH
225mV TO 5V
+
PHOTOVOLTAIC
CELL
VIN
SW
10µF
VOUT
LTC3105
OFF ON
40.2k
MPPC
SHDN
AUX
FB
PGOOD
LDO
FBLDO
1µF
GND
1020k
332k
2.2V
10µF
VOUT
4.1V
Li-Ion
4.7µF
3105 TA01a
Output Current vs Input Voltage
80
MPPC DISABLED
70
60
VOUT = 3.3V
50
VOUT = 4.2V
40
VOUT = 5V
30
20
10
0
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
INPUT VOLTAGE (V)
3105 TA01b
For more information www.linear.com/LTC3105
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Linear Technology Electronic Components Datasheet

LTC3105 Datasheet

400mA Step-Up DC/DC Converter

No Preview Available !

LTC3105
ABSOLUTE MAXIMUM RATINGS (Note 1)
SW Voltage
DC............................................................. –0.3V to 6V
Pulsed (<100ns)............................................–1V to 7V
Voltage, All Other Pins.................................. –0.3V to 6V
Operating Junction Temperature
Range (Note 2)..........................................–40°C to 85°C
Maximum Junction Temperature (Note 4)............. 125°C
Storage Temperature.............................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)
MS Package....................................................... 300°C
PIN CONFIGURATION
TOP VIEW
FB 1
LDO 2
FBLDO 3
SHDN 4
MPPC 5
10 AUX
11
9 VOUT
GND
8 PGOOD
7 SW
6 VIN
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
FB 1
LDO 2
FBLDO 3
SHDN 4
MPPC 5
GND 6
12 AUX
11 VOUT
10 PGOOD
9 SW
8 VIN
7 GND
MS PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 130°C/W, θJC = 21°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3105EDD#PBF
LTC3105EDD#TRPBF
LFQC
10-Lead (3mm × 3mm) Plastic DFN
LTC3105EMS#PBF
LTC3105EMS#TRPBF 3105
12-Lead Plastic MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
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For more information www.linear.com/LTC3105


Part Number LTC3105
Description 400mA Step-Up DC/DC Converter
Maker Linear Technology
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LTC3105 Datasheet PDF






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