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PDF LTC3588-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3588-1 | |
| Descripción | Piezoelectric Energy Harvesting Power Supply | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3588-1
Piezoelectric Energy
Harvesting Power Supply
FEATURES
n 950nA Input Quiescent Current (Output in
Regulation – No Load)
n 450nA Input Quiescent Current in UVLO
n 2.7V to 20V Input Operating Range
n Integrated Low-Loss Full-Wave Bridge Rectifier
n Up to 100mA of Output Current
n Selectable Output Voltages of 1.8V, 2.5V, 3.3V, 3.6V
n High Efficiency Integrated Hysteretic Buck DC/DC
n Input Protective Shunt – Up to 25mA Pull-Down at
VIN ≥ 20V
n Wide Input Undervoltage Lockout (UVLO) Range
n Available in 10-Lead MSE and 3mm × 3mm DFN
Packages
APPLICATIONS
n Piezoelectric Energy Harvesting
n Electro-Mechanical Energy Harvesting
n Wireless HVAC Sensors
n Mobile Asset Tracking
n Tire Pressure Sensors
n Battery Replacement for Industrial Sensors
n Remote Light Switches
n Standalone Nanopower Buck Regulator
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DESCRIPTION
The LTC®3588-1 integrates a low-loss full-wave bridge
rectifier with a high efficiency buck converter to form a
complete energy harvesting solution optimized for high
output impedance energy sources such as piezoelectric
transducers. An ultralow quiescent current undervoltage
lockout (UVLO) mode with a wide hysteresis window allows
charge to accumulate on an input capacitor until the buck
converter can efficiently transfer a portion of the stored
charge to the output. In regulation, the LTC3588-1 enters
a sleep state in which both input and output quiescent
currents are minimal. The buck converter turns on and
off as needed to maintain regulation.
Four output voltages, 1.8V, 2.5V, 3.3V and 3.6V, are pin
selectable with up to 100mA of continuous output current;
however, the output capacitor may be sized to service a
higher output current burst. An input protective shunt set
at 20V enables greater energy storage for a given amount
of input capacitance.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
100mA Piezoelectric Energy Harvesting Power Supply
ADVANCED CERAMETRICS PFC-W14
1μF
6V
CSTORAGE
25V
4.7μF
6V
PZ1 PZ2
VIN LTC3588-1 SW
VOUT
CAP PGOOD
VIN2 D0, D1
GND
35881 TA01
10μH
2 OUTPUT
VOLTAGE
SELECT
VOUT
47μF
6V
LTC3588-1 3.3V Regulator Start-Up Profile
22
20
CSTORAGE = 22μF, COUT = 47μF
NO LOAD, IVIN = 2μA
18
16
14 VIN
12
10
8
6
4 VOUT
2 PGOOD = LOGIC 1
0
0 200 400 600
TIME (s)
35881 TA01b
35881f
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1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3588-1
Bridge Leakage vs Temperature
20
VIN = 18V, LEAKAGE AT PZ1 OR PZ2
18
16
14
12
10
8
6
4
2
0
–55
–10 35
80 125 170
TEMPERATURE (°C)
35881 G07
Bridge Frequency Response
2.0
4VP-P APPLIED TO PZ1/PZ2 INPUT
1.8 MEASURED IN UVLO
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
35881 G08
1.8V Output vs Temperature
1.85
SLEEP THRESHOLD
1.80
WAKE-UP THRESHOLD
1.75
1.70
PGOOD FALLING
1.65
1.60
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G09
2.5V Output vs Temperature
2.55
SLEEP THRESHOLD
2.50
WAKE-UP THRESHOLD
2.45
2.40
2.35
2.30 PGOOD FALLING
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–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G10
3.3V Output vs Temperature
3.35
SLEEP THRESHOLD
3.30
WAKE-UP THRESHOLD
3.25
3.20
3.15
3.10
3.05 PGOOD FALLING
3.00
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G11
3.6V Output vs Temperature
3.65
SLEEP THRESHOLD
3.60
WAKE-UP THRESHOLD
3.55
3.50
3.45
3.40
3.35
PGOOD FALLING
3.30
3.25
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G12
VOUT Load Regulation
2.56
VIN = 5V, L = 10μH, D1 = 0, D0 = 1
2.54
2.52
2.50
2.48
2.46
2.44
1μ
10μ 100μ 1m 10m 100m
LOAD CURRENT (A)
35881 G13
VOUT Line Regulation
2.56
L = 10μH, ILOAD = 100mA, D1 = 0, D0 = 1
2.54
2.52
2.50
2.48
2.46
2.44
4 6 8 10 12 14 16 18
VIN (V)
35881 G14
IVOUT vs Temperature
120
110 VOUT = 3.6V
100
90
VOUT = 3.3V
80
70
60 VOUT = 2.5V
50
VOUT = 1.8V
40
30
20
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G15
35881f
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5 Page 
LTC3588-1
OPERATION
The D0/D1 inputs can be switched while in regulation as
shown in Figure 3. If VOUT is programmed to a voltage with
a PGOOD falling threshold above the old VOUT, PGOOD will
transition low until the new regulation point is reached.
When VOUT is programmed to a lower voltage, PGOOD
will remain high through the transition.
5
COUT = 100μF, ILOAD = 100mA
D1=D0=0
4
D1=D0=1
D1=D0=0
3
2 VOUT
1
PGOOD = LOGIC1
0
0 2 4 6 8 10 12 14 16 18 20
TIME (ms)
35881 F03
Figure 3. PGOOD Operation During D0/D1 Transition
Energy Storage
Harvested energy can be stored on the input capacitor
or the output capacitor. The wide input range takes ad-
vantage of the fact that energy storage on a capacitor is
proportional to the square of the capacitor voltage. After
the output voltage is brought into regulation any excess
energy is stored on the input capacitor and its voltage
increases. When a load exists at the output the buck can
efficiently transfer energy stored at a high voltage to the
regulated output. While energy storage at the input utilizes
the high voltage at the input, the load current is limited
to what the buck converter can supply. If larger loads
need to be serviced the output capacitor can be sized to
support a larger current for some duration. For example,
a current burst could begin when PGOOD goes high and
would continuously deplete the output capacitor until
PGOOD went low.
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| PDF Descargar | [ Datasheet LTC3588-1.PDF ] | |
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