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參數(shù)資料
| 型號： | LTC3851IMSE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 790 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 325K |
| 代理商： | LTC3851IMSE#PBF |
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LTC3851
22
3851fb
CLOAD to COUT is greater than 1:50, the switch rise time
should be controlled so that the load rise time is limited
to approximately 25 CLOAD. Thus a 10μF capacitor would
require a 250μs rise time, limiting the charging current
to about 200mA.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3851. These items are also illustrated graphically
in the layout diagram of Figure 9. Check the following in
your layout:
1. Are the board signal and power grounds segregated?
The LTC3851 GND pin should tie to the ground plane
close to the input capacitor(s). The low current or signal
ground lines should make a single point tie directly to
the GND pin. The synchronous MOSFET source pins
should connect to the input capacitor(s) ground.
2. Does the VFB pin connect directly to the feedback resis-
tors? The resistive divider R1, R2 must be connected
between the (+) plate of COUT and signal ground. The
47pF to 100pF capacitor should be as close as possible
to the LTC3851. Be careful locating the feedback resis-
tors too far away from the LTC3851. The VFB line should
not be routed close to any other nodes with high slew
rates.
3. Are the SENSE– and SENSE+ leads routed together
with minimum PC trace spacing? The lter capaci-
tor between SENSE+ and SENSE– should be as close
as possible to the LTC3851. Ensure accurate current
sensing with Kelvin connections as shown in Figure
10. Series resistance can be added to the SENSE lines
to increase noise rejection and to compensate for the
ESL of RSENSE.
APPLICATIONS INFORMATION
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
MODE/PLLIN
FREQ/PLLFLTR
RUN
TK/SS
ITH
VFB
SENSE–
SENSE+
SW
TG
BOOST
VIN
INTVCC
BG
GND
ILIM
LTC3851
47pF
CC
CSS
0.1μF
CC2
RFREQ
RC
1000pF
+ COUT
R1
R2
CB
DB
RSENSE
M2
4.7μF
M1
+
CIN
+
–
L1
VIN
+
VOUT
3851 F09
10Ω
+
Figure 9. LTC3851 Layout Diagram
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參數(shù)描述 |
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| LTC3851IUD#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3852EUDD#PBF | 功能描述:IC REG CTRLR DOUBLER PWM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
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