參數(shù)資料
型號(hào)： LTC3527EUD
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.8 A DUAL SWITCHING CONTROLLER, 2800 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WEED-2, QFN-16
文件頁(yè)數(shù)： 5/22頁(yè)
文件大?。?/td> 359K
代理商： LTC3527EUD
LTC3527/LTC3527-1
13
35271fc
35271 F01
VIN1
VIN
VIN2
VOUT1
GND
MODE SHDN1
SHDN2 FSEL
VOUT2
APPLICATIONS INFORMATION
Figure 1. Recommended Component Placement for a Dual-Layer Board
PCB Layout Guidelines
The high speed operation of the LTC3527/LTC3527-1
demands careful attention to board layout. A careless
layout will result in reduced performance. Figure 1 shows
the recommended component placement. A large ground
pin copper area will help to lower the die temperature. A
multilayer board with a separate ground plane is ideal, but
not absolutely necessary.
COMPONENT SELECTION
Inductor Selection
The LTC3527/LTC3527-1 can utilize small surface mount
inductors due to their fast 1.2MHz/2.2MHz switching
frequencies. Inductor values between 3.3μH and 4.7μH
are suitable for most 1.2MHz applications. Inductor values
between 1.5μH and 2.2μH are suitable for most 2.2MHz
applications. Larger values of inductance will allow slightly
greater output current capability (and lower the Burst
Mode threshold) by reducing the inductor ripple cur-
rent. Increasing the inductance above 10μH will increase
size while providing little improvement in output current
capability.
The minimum inductance value is given by:
L
VV
V
f Ripple V
IN MIN
OUT MAX
IN MIN
OU
>
()
(
)
()
(
–
)
T
TMAX
()
where:
Ripple = Allowable inductor current ripple (amps
peak-to-peak)
VIN(MIN) = Minimum input voltage
VOUT(MAX) = Maximum output voltage
f = Oscillator frequency (MHz)
The inductor current ripple is typically set for 20% to
40% of the maximum inductor current. High frequency
ferrite core inductor materials reduce frequency dependent
power losses compared to cheaper powdered iron types,
improving efciency. The inductor should have low ESR
(series resistance of the windings) to reduce the I2R power
losses, and must be able to support the peak inductor
current without saturating. Molded chokes and some
chip inductors usually do not have enough core area to
support the peak inductor currents of 900mA (500mA)
seen on the LTC3527/LTC3527-1. To minimize radiated
noise, use shielded inductors. See Table 1 for suggested
components and suppliers.
相關(guān)PDF資料
PDF描述
LTC3527EUD#TR 0.8 A DUAL SWITCHING CONTROLLER, 2800 kHz SWITCHING FREQ-MAX, PQCC16
LTC3527EUD-1#TR 0.8 A DUAL SWITCHING CONTROLLER, 2800 kHz SWITCHING FREQ-MAX, PQCC16
LTC3528EDDB-2#TRPBF SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO8
LTC3528EDDB-2#TRMPBF SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO8
LTC3529EDCB#PBF SWITCHING CONTROLLER, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3527EUD#PBF 功能描述:IC REG BOOST SYNC ADJ DL 16QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC3527EUD#TRPBF 功能描述:IC REG BOOST SYNC ADJ DL 16QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC3527EUD-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters
LTC3527EUD-1#2EAPBF 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step Up 0.5V to 5V 16-Pin QFN EP
LTC3527EUD-1#PBF 功能描述:IC REG BOOST SYNC ADJ DL 16QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
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