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參數(shù)資料
| 型號(hào)： | LT3467IS5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 245K |
| 代理商： | LT3467IS5 |
7
LT3467/LT3467A
3467afc
APPLICATIONS INFORMATION
WU
U
Table 1. Inductor Manufacturers.
Sumida
(847) 956-0666
www.sumida.com
TDK
(847) 803-6100
www.tdk.com
Murata
(714) 852-2001
www.murata.com
FDK
(408) 432-8331
www.fdk.co.jp
Soft-Start
The soft-start feature provides a way to limit the inrush
current drawn from the supply upon startup. An internal
250k resistor charges the external soft start capacitor to
1.255V. After the capacitor reaches 0.15V the rate of
voltage rise at the output of the comparator A1 tracks the
rate of voltage rise of the soft-start capacitor. This limits
the inrush current drawn from the supply during startup.
Once the part is shut down, the soft start capacitor is
quickly discharged to 0.4V, then slowly discharged through
the 250k resistor to ground. If the part is to be shut down
and re-enabled in a short period of time while soft-start is
used, you must ensure that the soft-start capacitor has
enough time to discharge before re-enabling the part.
Typical values of the soft-start capacitor range from 10nF
to 200nF.
GND
VIN
SW
SS
FB
VIN
2.6V TO
4.2V
D1
L1
2.7
μH
R1
402k
LT3467
3467 TA05a
C2
15
μF
C4
3.3pF
C1
4.7
μF
R2
133k
VOUT
5V
765mA AT VIN = 4.2V,
540mA AT VIN = 3.3V,
360mA AT VIN = 2.6V
C1, C2: X5R OR X7R, 6.3V
D1: ON SEMICONDUCTOR MBRM120
L1: SUMIDA CR43-2R7
SHDN
OFF ON
C3
0.047
μF
Figure 2. Single Li-Ion Cell to 5V Boost Converter
(Same as 1st Page Application)
Supply Current of Figure 2 During
Startup without Soft-Start Capacitor
VOUT
1V/DIV
ISUPPLY
0.5A/DIV
0.1ms/DIV
Supply Current of Figure 2 During
Startup with 47nF Soft-Start Capacitor
VOUT
1V/DIV
ISUPPLY
0.5A/DIV
0.5ms/DIV
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