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LTC3854EMSE 数据表(PDF) 22 Page - Linear Technology

部件名 LTC3854EMSE
功能描述  Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller
Download  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3854EMSE 数据表(HTML) 22 Page - Linear Technology

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LTC3854

3854fa
Choosing an RJK0330DPB for the bottom FET will pro-
vide:
BVDSS = 30V
RDS(ON) = 3.9mΩ maximum at 25°C, VGS = 4.5V
QG = 27nC, typical, at VGS = 4.5V
PSYNC =
20V
− 1.2V
20V
• 15A
(
)2
• 1
+ 0.005 • 100°C – 25°C
(
)
(
)•3.9mΩ
PSYNC =1.1W
Assumingathermalresistanceof40°C/Wforthemainand
synchronous FETs, the resulting junction temperatures at
an ambient of 60°C will be 82°C and 104°C, respectively.
applicaTions inForMaTion
Figure 6. 1.2V/15A Converter from Design Example
Some airflow may be required for higher ambient tem-
peratures. A maximum MOSFET junction temperature of
110°C at worst case ambient generally provides adequate
margin.
Given a typical QG of 8nC for the RJK0305DPB and 27nC
for the RJK0330DPB and the 400kHz switching frequency,
the current supplied by INTVCC will be:
IGATECHG = (8nC + 27nC) • 400kHz = 14mA
The resulting controller temperature at 60°C and a 20V
input will be:
TJ = 60°C + 20V • 14mA • 76°C/W = 81°C
which is well under the maximum junction temperature
of 125°C.
3854 F06
LTC3854
0.1µF
0.1µF
180µF
25V
4.7µF
D1
100pF
2200pF
L
0.56µH
1.8m DCR
3.09k
0.1µF
COUT1
330µF
2
VOUT
1.2V
15A
VIN
4.5V TO 28V
4.99k
10k
3.9k
VIN
TG
BOOST
SW
INTVCC
BG
GND
RUN/SS
ITH
FB
SENSE
SENSE+
M1
M2
COUT2
47µF
10µF
25V
2
D1 = CMDSH-3
M1 = RENESAS RJK0305DPB
M2 = RENESAS RJK0330DPB
L = VISHAY IHLP4040DZ-01 0.56µH
COUT1 = SANYO 2R5TPE330M9
COUT2 = MURATA GRM31CR60J476K
+


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