LTC3108-1 Datasheet PDF - Linear Technology


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LTC3108-1
Linear Technology

Part Number LTC3108-1
Description Ultralow Voltage Step-Up Converter and Power Manager
Page 24 Pages

LTC3108-1 datasheet pdf
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LTC3108-1www.DataSheet4U.com
Ultralow Voltage Step-Up
Converter and Power Manager
Features
n Operates from Inputs of 20mV
n Complete Energy Harvesting Power
Management System
- Selectable VOUT of 2.5V, 3V, 3.7V or 4.5V
- LDO: 2.2V at 3mA
- Logic Controlled Output
- Reserve Energy Output
n Power Good Indicator
n Uses Compact Step-Up Transformers
n Small 12-Lead (3mm × 4mm) DFN or 16-Lead
SSOP Packages
Applications
n Remote Sensors and Radio Power
n Surplus Heat Energy Harvesting
n HVAC Systems
n Industrial Wireless Sensing
n Automatic Metering
n Building Automation
n Predictive Maintenance
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Description
The LTC®3108-1 is a highly integrated DC/DC converter ideal
for harvesting and managing surplus energy from extremely
low input voltage sources such as TEGs (thermoelectric
generators), thermopiles and small solar cells. The step-up
topology operates from input voltages as low as 20mV.
Using a small step-up transformer, the LTC3108-1 provides
a complete power management solution for wireless sens-
ing and data acquisition. The 2.2V LDO powers an external
microprocessor, while the main output is programmed to
one of four fixed voltages to power a wireless transmitter
or sensors. The power good indicator signals that the main
output voltage is within regulation. A second output can be
enabled by the host. A storage capacitor provides power
when the input voltage source is unavailable. Extremely
low quiescent current and high efficiency design ensure
the fastest possible charge times of the output reservoir
capacitor. The LTC3108-1 is functionally equivalent to the
LTC3108 except for its unique fixed VOUT options.
The LTC3108-1 is available in a small, thermally enhanced
12-lead (3mm × 4mm) DFN package and a 16-lead SSOP
package.
Typical Application
THERMOELECTRIC
GENERATOR
++
20mV TO 500mV
Wireless Remote Sensor Application
Powered From a Peltier Cell
1:100
1nF
C1
VSTORE
5.25V
+
220µF
330pF
LTC3108-1
C2
SW
VOUT2
PGD
VLDO
PGOOD
2.2V
VS2 VOUT 3V +
0.1F
6.3V
µP
2.2µF SENSORS
470µF RF LINK
VS1 VOUT2_EN
VAUX GND
31081 TA01a
1µF
VOUT Charge Time
1000 VOUT = 3V
COUT = 470µF
100
10
1
1:100 Ratio
1:50 Ratio
1:20 Ratio
0
0 50 100 150 200 250 300 350 400
VIN (mV)
31081 TA01b
31081f




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Absolute Maximum Ratings (Note 1)
SW Voltage...................................................–0.3V to 2V
C1 Voltage....................................................–0.3V to 6V
C2 Voltage (Note 5).........................................–8V to 8V
VOUT2, VOUT2_EN...........................................–0.3V to 6V
VAUX....................................................15mA into VAUX
VS1, VS2, VAUX, VOUT, PGD........................–0.3V to 6V
VLDO, VSTORE.............................................–0.3V to 6V
Operating Junction Temperature Range
(Note 2)................................................. –40°C to 125°C
Storage Temperature Range.................. –65°C to 125°C
Pin Configuration
TOP VIEW
VAUX
VSTORE
VOUT
VOUT2
VLDO
PGD
1
2
3
4
5
6
12 SW
11 C2
13 10 C1
GND
9 VOUT2_EN
8 VS1
7 VS2
DE PACKAGE
12-LEAD (4mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB (NOTE 4)
TOP VIEW
GND
VAUX
VSTORE
VOUT
VOUT2
VLDO
PGD
GND
1
2
3
4
5
6
7
8
16 GND
15 SW
14 C2
13 C1
12 VOUT2_EN
11 VS1
10 VS2
9 GND
GN PACKAGE
16-LEAD PLASTIC SSOP NARROW
TJMAX = 125°C, θJA = 110°C/W
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
LTC3108EDE-1#PBF
LTC3108IDE-1#PBF
LTC3108EGN-1#PBF
LTC3108EDE-1#TRPBF
LTC3108IDE-1#TRPBF
LTC3108EGN-1#TRPBF
31081
31081
31081
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
16-Lead Plastic SSOP
LTC3108IGN-1#PBF
LTC3108IGN-1#TRPBF 31081
16-Lead Plastic SSOP
Consult LTC Marketing for parts specified for other fixed output voltages or wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
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 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
E lectrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for TA = 25°C (Note 2). VAUX = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Minimum Start-Up Voltage
Using 1:100 Transformer Turns Ratio, VAUX = 0V
20 50
No-Load Input Current
Input Voltage Range
Using 1:100 Transformer Turns Ratio; VIN = 20mV,
VOUT2_EN = 0V; All Outputs Charged and in Regulation
Using 1:100 Transformer Turns Ratio
l VSTARTUP
3
500

UNITS
mV
mA
mV
31081f



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E lectrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for TA = 25°C (Note 2). VAUX = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Voltage
VOUT Quiescent Current
VAUX Quiescent Current
VS1 = VS2 = GND
VS1 = VAUX, VS2 = GND
VS1 = GND, VS2 = VAUX
VS1 = VS2 = VAUX
VOUT = 3.7V, VOUT2_EN = 0V
No Load, All Outputs Charged
l 2.45 2.50 2.55
l 2.94 3.00 3.06
l 3.626 3.70 3.774
l 4.41 4.50 4.59
0.2
69
V
V
V
V
µA
µA
LDO Output Voltage
0.5mA Load
l 2.134 2.2 2.266
V
LDO Load Regulation
For 0mA to 2mA Load
0.5 1
%
LDO Line Regulation
For VAUX from 2.5V to 5V
0.05 0.2
%
LDO Dropout Voltage
LDO Current Limit
IVLDO = 2mA
VLDO = 0V
l
l4
100 200
11
mV
mA
VOUT Current Limit
VSTORE Current Limit
VOUT = 0V
VSTORE = 0V
l 2.8 4.5 7
l 2.8 4.5 7
mA
mA
VAUX Clamp Voltage
Current into VAUX = 5mA
l5
5.25 5.55
V
VSTORE Leakage Current
VSTORE = 5V
0.1 0.3
µA
VOUT2 Leakage Current
VS1, VS2 Threshold Voltage
VOUT2 = 0V, VOUT2_EN = 0V
l 0.4
0.1
0.85 1.2
µA
V
VS1, VS2 Input Current
VS1 = VS2 = 5V
0.01 0.1
µA
PGD Threshold (Rising)
PGD Threshold (Falling)
PGD VOL
PGD VOH
PGD Pull-Up Resistance
Measured Relative to the VOUT Voltage
Measured Relative to the VOUT Voltage
Sink Current = 100µA
Source Current = 0
–7.5
–9
0.15 0.3
2.1 2.2 2.3
1
%
%
V
V
VOUT2_EN Threshold Voltage
VOUT2_EN Pull-Down Resistance
VOUT2 Turn-On Time
VOUT2 Turn-Off Time
VOUT2 Current Limit
VOUT2 Current Limit Response Time
VOUT2 P-Channel MOSFET On-Resistance
N-Channel MOSFET On-Resistance
VOUT2_EN Rising
(Note 3)
VOUT = 3.7V
(Note 3)
VOUT = 3.7V (Note 3)
C2 = 5V (Note 3)
l 0.4
l 0.15
1 1.3
5
5
0.15
0.3 0.45
350
1.3
0.5
V
µs
µs
A
ns
Ω
Ω
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3108-1 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3108-1E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3108-1I is guaranteed over the full –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
is determined by specific operating conditions in conjunction with
board layout, the rated thermal package thermal resistance and other
environmental factors. The junction temperature (TJ) is calculated from
the ambient temperature (TA) and power dissipation (PD) according to
the formula: TJ = TA + (PD θJA°C/W), where θJA is the package thermal
impedance.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
43°C/W.
Note 5: The absolute maximum rating is a DC rating. Under certain
conditions in the applications shown, the peak AC voltage on the C2 pin
may exceed ±8V. This behavior is normal and acceptable because the
current into the pin is limited by the impedance of the coupling capacitor.
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Typical Performance Characteristics TA = 25°C, unless otherwise noted.

IIN vs VIN, (VOUT = 0V)
1000
1:50 RATIO, C1 = 4.7n
1:100 RATIO, C1 = 1n
1:20 RATIO, C1 = 10n
100
10
1
10 100 1000
VIN (mV)
31081 G00
I1V:O5U0TRaantdioETfrfiacniesfnocrymvesr VIN,
3200 C1 = 4.7nF
2800
IVOUT
(VOUT = 0V)
2400 EFFICIENCY
(VOUT = 4V)
2000
1600
1200
IVOUT
(VOUT = 4V)
80
70
60
50
40
30
800 20
400 10
00
0 100 200 300 400 500
VIN (mV)
31081 G02
Input Resistance
(VOUT Charging)
vs
VIN
10
9
8 1:20 RATIO
7
6
5 1:50 RATIO
4
3
2 1:100 RATIO
1
0
0 100 200 300 400 500
VIN (mV)
31081 G04
I1V:O2U0TRaantdioETfrfiacniesfnocrymvesr VIN,
4000 C1 = 10nF
3500
3000
IVOUT
(VOUT = 0V)
80
70
60
2500
50
2000 EFFICIENCY
(VOUT = 4V)
1500
IVOUT
(VOUT = 4V)
40
30
1000
20
500 10
00
0 100 200 300 400 500
VIN (mV)
31081 G01
IVOUT and Efficiency vs VIN,
1:100 Ratio Transformer
1400 C1 = 1nF
1200
1000 EFFICIENCY
800 (VOUT = 4V)
IVOUT
(VOUT = 0V)
70
60
50
40
600
IVOUT
30
400
(VOUT = 4V)
20
200 10
00
0 100 200 300 400 500
VIN (mV)
31081 G03
IVOUT vs VIN and Source Resistance,
1:20 Ratio
10000 C1 = 10nF
1000
100
10
10Ω
0
0 100 200 300 400 500 600 700 800
VIN OPEN-CIRCUIT (mV)
31081 G05
31081f




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