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參數(shù)資料
| 型號： | LTC3588IMSE-2#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 3/18頁 |
| 文件大小： | 400K |
| 代理商： | LTC3588IMSE-2#PBF |
LTC3588-2
11
35882fa
applicaTions inForMaTion
The LTC3588-2 will gather energy and convert it to a use-
able output voltage to power microprocessors, wireless
sensors, and wireless transmission components. Such a
wireless sensor application may require much more peak
power than a piezoelectric element can produce. However,
the LTC3588-2 accumulates energy over a long period of
time to enable efficient use for short power bursts. For
continuous operation, these bursts must occur with a low
dutycyclesuchthatthetotaloutputenergyduringtheburst
does not exceed the average source power integrated over
an energy accumulation cycle. For piezoelectric inputs the
time between cycles could be minutes, hours, or longer
depending on the selected capacitor values and the nature
of the vibration source.
PGOOD Signal
The PGOOD signal can be used to enable a sleeping
microprocessor or other circuitry when VOUT reaches
regulation, as shown in Figure 5. Typically VIN will be
somewhere between the UVLO thresholds at this time
and a load could only be supported by the output capaci-
tor. Alternatively, waiting a period of time after PGOOD
goes high would let the input capacitor accumulate more
energy allowing load current to be maintained longer as
the buck efficiently transfers that energy to the output.
While active, a microprocessor may draw a small load
when operating sensors, and then draw a large load to
transmit data. Figure 5 shows the LTC3588-2 responding
smoothly to such a load step.
Input and Output Capacitor Selection
The input and output capacitors should be selected based
on the energy needs and load requirements of the ap-
plication. In every case the VIN capacitor should be rated
to withstand the highest voltage ever present at VIN.
For 100mA or smaller loads, storing energy at the input
takes advantage of the high voltage input since the buck
can deliver 100mA average load current efficiently to the
output. The input capacitor should then be sized to store
enough energy to provide output power for the length of
time required. This may involve using a large capacitor,
lettingVINchargetoahighvoltage,orboth.Enoughenergy
should be stored on the input so that the buck does not
reach the UVLO falling threshold which would halt energy
transfer to the output. In general:
PLOADtLOAD =
1
2
ηCIN VIN2 VUVLO(FALLING)2
(
)
VUVLO(FALLING) ≤ VIN ≤ VSHUNT
The above equation can be used to size the input capaci-
tor to meet the power requirements of the output for an
application with continuous input energy. Here
η is the
average efficiency of the buck converter over the input
range and VIN is the input voltage when the buck begins to
switch. This equation may overestimate the input capaci-
tor necessary since load current can deplete the output
capacitor all the way to the lower PGOOD threshold. It also
assumes that the input source charging has a negligible
35882 F05a
35882 F05b
PZ1
VIN
CAP
VIN2
D1
D0
PZ2
PGOOD
SW
VOUT
LTC3588-2
MICROPROCESSOR
GND
1F
6V
4.7F
6V
10F
25V
47F
6V
22H
5V
EN
CORE
GND
TX
250s/DIV
VIN = 18V
L = 22H, COUT = 47F
LOAD STEP BETWEEN 5mA and 55mA
OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
LOAD
CURRENT
25mA/DIV
5mA
Figure 5. 5V Piezoelectric Energy Harvester Powering a Microprocessor
with a Wireless Transmitter and 50mA Load Step Response
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