LTC3105
400mA Step-Up DC/DC
Converter with Maximum Power
Point Control and 250mV Start-Up
FEATURES DESCRIPTION
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Low Start-Up Voltage: 250mV The LTC 3105 is a high efficiency step-up DC/DC converter
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Maximum Power Point Control that can operate from input voltages as low as 225mV. A
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Wide V Range: 225mV to 5V 250mV start-up capability and integrated maximum power
IN
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Auxiliary 6mA LDO Regulator point controller (MPPC) enable operation directly from low
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Burst Mode Operation: I = 24A voltage, high impedance alternative power sources such as
Q
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Output Disconnect and Inrush Current Limiting photovoltaic cells, TEGs (thermoelectric generators) and
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V > V Operation fuel cells. A user programmable MPPC set point maximizes
IN OUT
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Antiringing Control the energy that can be extracted from any power source.
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Soft Start Burst Mode operation, with a proprietary self adjusting
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Automatic Power Adjust peak current, optimizes converter efficiency and output
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Power Good Indicator voltage ripple over all operating conditions.
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10-Lead 3mm 3mm 0.75mm DFN and 12-Lead
The AUX powered 6mA LDO provides a regulated rail for
MSOP Packages
external microcontrollers and sensors while the main
output is charging. In shutdown, I is reduced to 10A
Q
APPLICATIONS
and integrated thermal shutdown offers protection from
n overtemperature faults. The LTC3105 is offered in 10-lead
Solar Powered Battery/Supercapacitor Chargers
n 3mm 3mm 0.75mm DFN and 12-lead MSOP packages.
Energy Harvesting
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Remote Industrial Sensors
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
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Low Power Wireless Transmitters
trademarks are the property of their respective owners.
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Cell Phone, MP3, PMP and GPS Accessory Chargers
TYPICAL APPLICATION
Single Photovoltaic Cell Li-Ion Trickle Charger Output Current vs Input Voltage
80
10H
MPPC DISABLED
70
225mV TO 5V
V = 3.3V
V OUT
SW
IN 60
+
V
OUT
PHOTOVOLTAIC V
OUT
10F 4.1V 50
CELL
V = 4.2V
OUT
LTC3105 1020k
40
V = 5V
FB OUT
Li-Ion
30
MPPC PGOOD
332k
OFF
20
ON SHDN LDO 2.2V
10F
40.2k
AUX FBLDO
10
GND
1F 4.7F
0
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
3105 TA01a
INPUT VOLTAGE (V)
3105 TA01b
3105fb
1
For more information www.linear.com/LTC3105
OUTPUT CURRENT (mA)LTC3105
ABSOLUTE MAXIMUM RATINGS (Note 1)
Maximum Junction Temperature (Note 4) ............ 125C
SW Voltage
Storage Temperature.............................. 65C to 150C
DC ............................................................ 0.3V to 6V
Lead Temperature (Soldering, 10 sec.)
Pulsed (<100ns) ...........................................1V to 7V
MS Package ......................................................300C
Voltage, All Other Pins ................................. 0.3V to 6V
Operating Junction Temperature
Range (Note 2) .........................................40C to 85C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
FB 1 10 AUX
1 12 AUX
FB
LDO 2 9 V
LDO 2 11 V
OUT
OUT
11
FBLDO 3 10 PGOOD
FBLDO 3 8 PGOOD
GND
SHDN 4 9 SW
SHDN 4 7 SW
MPPC 5 8 V
IN
MPPC 5 6 V
IN
GND 6 7 GND
DD PACKAGE MS PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN 12-LEAD PLASTIC MSOP
T = 125C, = 130C/W, = 21C/W
T = 125C, = 43C/W, = 3C/W
JMAX JA JC JMAX JA JC
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3105EDD#PBF LTC3105EDD#TRPBF LFQC 10-Lead (3mm 3mm) Plastic DFN 40C to 85C
LTC3105EMS#PBF LTC3105EMS#TRPBF 3105 12-Lead Plastic MSOP 40C to 85C
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: