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參數(shù)資料
| 型號： | LTC3872ETS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 261K |
| 代理商： | LTC3872ETS8 |
LTC3872
14
3872fa
APPLICATIO S I FOR ATIO
WU
U
3. Assuming a MOSFET junction temperature of 125°C,
the room temperature MOSFET RDS(ON) should be less
than:
RV
D
I
DS ON
SENSE MAX
MAX
OMAX
()
(
)
(
–
≤
+
1
2
χ
))
.
–.
.
.
ρT
V
A
m
=
+
≈Ω
0 175
10 39
1
04
2
21 5
30
The MOSFET used was the Si3460, which has a maximum
RDS(ON) of 27mΩ at 4.5V VGS, a BVDSS of greater than
30V, and a gate charge of 13.5nC at 4.5V VGS.
4. The diode for this design must handle a maximum DC
output current of 2A and be rated for a minimum reverse
voltage of VOUT, or 5V. A 25A, 15V diode from On Semi-
conductor (MBRB2515L) was chosen for its high power
dissipation capability.
5. The output capacitor usually consists of a lower valued,
low ESR ceramic.
6. The choice of an input capacitor for a boost converter
depends on the impedance of the source supply and the
amount of input ripple the converter will safely tolerate.
For this particular design two 22μF Taiyo Yuden ceramic
capacitors (JMK325BJ226MM) is required (the input
and return lead lengths are kept to a few inches. As with
the output node, check the input ripple with a single
oscilloscope probe connected across the input capacitor
terminals.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3872. These items are illustrated graphically in
the layout diagram in Figure 7. Check the following in
your layout:
1. The Schottky diode should be closely connected be-
tween the output capacitor and the drain of the external
MOSFET.
2. The input decoupling capacitor (0.1μF) should be con-
nected closely between VIN and GND.
3. The trace from SW to the switch point should be kept
short.
4. Keep the switching node NGATE away from sensitive
small signal nodes.
5. The VFB pin should connect directly to the feedback
resistors. The resistive divider R1 and R2 must be con-
nected between the (+) plate of COUT and signal ground.
Figure 7. LTC3872 Layout Diagram (See PC Board Layout Checklist)
IPRG
ITH
VFB
GND
SW
RUN/SS
VIN
NGATE
LTC3872
3872 F07
R1
R2
RITH
CIN
COUT
VOUT
VIN
CITH
+
D1
M1
L1
BOLD LINES INDICATE HIGH CURRENT PATHS
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相關(guān)代理商/技術(shù)參數(shù) |
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| LTC3872ETS8#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Up 2.75V to 9.8V Input 8-Pin TSOT-23 制造商:Linear Technology 功能描述:BOOST 9.8VIN 550KHZ 60V 8TSOT23 制造商:Linear Technology 功能描述:BOOST, 9.8VIN, 550KHZ, 60V, 8TSOT23 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BOOST, 550KHZ, TSOT-23-8; Primary Input Voltage:9.8V; No. of Outputs:1; Output Current:10A; No. of Pins:8; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:8-TSOT-23 ;RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BOOST, 550KHZ, TSOT-23-8; Primary Input Voltage:9.8V; No. of Outputs:1; No. of Pins:8; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:8-TSOT-23 ;RoHS Compliant: Yes |
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