參數(shù)資料
型號(hào): LTC3851AMPMSE-1#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PDSO16
封裝: LEAD FREE, PLASTIC, MSOP-16
文件頁數(shù): 16/30頁
文件大?。?/td> 0K
代理商: LTC3851AMPMSE-1#PBF
LTC3851A-1
23
3851a1fa
A second, more severe transient is caused by switching
in loads with large (>1μF) supply bypass capacitors. The
discharged bypass capacitors are effectively put in parallel
with COUT, causing a rapid drop in VOUT. No regulator can
alter its delivery of current quickly enough to prevent this
sudden step change in output voltage if the load switch
resistance is low and it is driven quickly. If the ratio of
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
LTC3851A-1. 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 LTC3851A-1 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.
applicaTions inForMaTion
Figure 9. LTC3851A-1 Layout Diagram
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
PGOOD
LTC3851A-1
47pF
CC
CSS
0.1mF
CC2
RFREQ
RC
RPGOOD
1000pF
+ COUT
R1
R2
CB
DB
RSENSE
D1
M2
+
4.7F
VPULL-UP
M1
+
CIN
+
L1
VIN
+
VOUT
3851A1 F09
相關(guān)PDF資料
PDF描述
LTC3856IFE#PBF SWITCHING CONTROLLER, PDSO38
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