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參數資料
| 型號： | LTC3588EDD-2#TRPBF |
| 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： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數： | 4/18頁 |
| 文件大?。?/td> | 400K |
| 代理商： | LTC3588EDD-2#TRPBF |
LTC3588-2
12
35882fa
applicaTions inForMaTion
effect during this time. For applications where the output
must reach regulation on a single UVLO cycle, the energy
required to charge the output capacitor must be taken into
account when sizing CIN.
The duration for which the regulator sleeps depends on
the load current and the size of the output capacitor. The
sleep time decreases as the load current increases and/or
astheoutputcapacitordecreases.TheDCsleephysteresis
window is ±16mV around the programmed output volt-
age. Ideally this means that the sleep time is determined
by the following equation:
tSLEEP =COUT
32mV
ILOAD
This is true for output capacitors on the order of 100F
or larger, but as the output capacitor decreases towards
10F delays in the internal sleep comparator along with
the load current may result in the VOUT voltage slewing
past the ±16mV thresholds. This will lengthen the sleep
time and increase VOUT ripple. A capacitor less than 10F
is not recommended as VOUT ripple could increase to an
undesirable level.
If transient load currents above 100mA are required then a
larger capacitor can be used at the output. This capacitor
willbecontinuouslydischargedduringaloadconditionand
the capacitor can be sized for an acceptable drop in VOUT:
COUT = VOUT+ VOUT–
(
)ILOAD IBUCK
tLOAD
Here VOUT+ is the value of VOUT when PGOOD goes high
and VOUT– is the desired lower limit of VOUT. IBUCK is the
average current being delivered from the buck converter,
typically IPEAK/2.
A standard surface mount ceramic capacitor can be used
for COUT, though some applications may be better suited
to a low leakage aluminum electrolytic capacitor or a
supercapacitor. These capacitors can be obtained from
manufacturers such as Vishay, Illinois Capacitor, AVX,
or CAP-XX.
Inductor
The buck is optimized to work with a 22H inductor. Induc-
tor values greater than 22H may yield benefits in some
applications. For example, a larger inductor will benefit
high voltage applications by increasing the on-time of the
PMOS switch and improving efficiency by reducing gate
charge loss. Choose an inductor with a DC current rating
greater than 350mA. The DCR of the inductor can have
an impact on efficiency as it is a source of loss. Trade-offs
between price, size, and DCR should be evaluated. Table 3
lists several inductors that work well with the LTC3588-2.
Table 3. Recommended Inductors for LTC3588-2
INDUCTOR
TYPE
L
(H)
MAX
IDC
(mA)
MAX
DCR
(Ω)
SIZE in mm
(L
× W × H)
MANU-
FACTURER
A997AS-220M
22
390
0.440 4.0 × 4.0 × 1.8
Toko
LPS5030-223MLC
22
700
0.190 4.9 × 4.9 × 3.0
Coilcraft
LPS4012-473MLC
47
350
1.400 4.0 × 4.0 × 1.2
Coilcraft
SLF7045T
100
500
0.250 7.0 × 7.0 × 4.8
TDK
VIN2 and CAP Capacitors
A 1μF capacitor should be connected between VIN and
CAP and a 4.7F capacitor should be connected between
VIN2 and GND. These capacitors hold up the internal rails
during buck switching and compensate the internal rail
generation circuits.
Additional Applications with Piezo Inputs
The versatile LTC3588-2 can be used in a variety of con-
figurations.Figure6showsasinglepiezosourcepowering
two LTC3588-2s simultaneously, providing capability for
multiple rail systems. As the piezo provides input power
both VIN rails will initially come up together, but when one
output starts drawing power, only its corresponding VIN
will fall as the bridges of each LTC3588-2 provide isola-
tion. Input piezo energy will then be directed to this lower
voltage capacitor until both VIN rails are again equal. This
configuration is expandable to any number of LTC3588-2s
powered by a single piezo as long as the piezo can sup-
port the sum total of the quiescent currents from each
LTC3588-2.
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| LTC3588EDD-2#PBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
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相關代理商/技術參數 |
參數描述 |
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| LTC3588EMSE-1#PBF | 功能描述:IC ENERGY HARVESTING PSU 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 應用:熱電冷卻器 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.173"，4.40mm 寬）裸露焊盤 供應商設備封裝:28-TSSOP 裸露焊盤 包裝:管件 產品目錄頁面:1410 (CN2011-ZH PDF) |
| LTC3588EMSE-1#PBF | 制造商:Linear Technology 功能描述:PIEZOELECTRIC ENERGY HARVESTING POWER SU 制造商:Linear Technology 功能描述:IC ENERGY HARVESTING POWER SUPPLY MSOP10 |
| LTC3588EMSE-1#TRPBF | 功能描述:IC ENERGY HARVESTING PSU 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC3588EMSE-1PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Piezoelectric Energy Harvesting Power Supply |
| LTC3588EMSE-1TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Piezoelectric Energy Harvesting Power Supply |
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