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參數(shù)資料
| 型號(hào)： | LT3587EUD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 395K |
| 代理商： | LT3587EUD#TRPBF |
LT3587
19
3587fc
APPLICATIONS INFORMATION
Lower Input Voltage Applications
The LT3587 can be used in lower input voltage applica-
tions. The VIN supply voltage to the LT3587 must be
2.5V to 6V. However, the inductors can be run off a lower
voltage. This allows the outputs to be powered off two
alkaline cells. Most portable devices and systems have
a 3.3V logic supply voltage which can be used to power
Figure 17. 2 AA Cells Providing CCD Positive and Negative Supply
and a Three White Backlight LED Driver
L1
15μH
L4
10μH
3587 F17
IFB3
EN/SS3
EN/SS1
FLT
SW2
GND
FB2
CAP1
FB1
VOUT1
LT3587
VFB3 VOUT3 CAP3
SW3
SW1
C1
4.7μF
RFB1
787k
CCD POSITIVE
12V, 10mA
2AA CELLS
2V TO 3.2V
C2
2.2μF
L2
15μH
L3
15μH
RFB2
1M
CCD NEGATIVE
–8V, 20mA
LED DRIVER
20mA UP TO 12V
2AA CELLS
2V TO 3.2V
C7
10μF
DS2
VIN
DS3
C4
1μF
RVFB3
787k
(OPTIONAL)
DS1
RIFB3
8.06k
C1: MURATA GRM21BR61E475KA12L
C2: MURATA GRM188R61C225KE15D
C4: MURATA GRM188R61E105KA12B
C6: MURATA GRM155R61A105KE15D
C7: MURATA GRM21BR71A106KE51L
CFB1: MURATA GRM1555C1H3R3BZ01D
CFB2: MURATA GRM1555C1H6R3BZ01D
L1, L2, L3: SUMIDA CDRH2D18/HP-150N
L4: TOKO 1071AS-100M
DS1, DS2, DS3: NXP PMEG2005EB
C6
1μF
3.3V
CFB1
3.3pF
CFB2
6.8pF
the LT3587. The outputs can be driven straight from the
battery, resulting in higher efciency.
Figure 17 shows a typical digital still camera application
with CCD positive and negative supply as well as an LED
driver powered by two AA cells. The battery is connected
to the input inductors and the chip is powered with a 3.3V
logic supply voltage.
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