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參數資料
型號: LTC3700EMS#TRPBF
廠商: Linear Technology
文件頁數: 13/16頁
文件大小: 215K
描述: IC REG DL BUCK/LINEAR 10MSOP
產品培訓模塊: More Information on LDOs
標準包裝: 2,500
拓撲: 降壓(降壓)(1),線性(LDO)(1)
功能: 任何功能
輸出數: 2
頻率 - 開關: 550kHz
電壓/電流 - 輸出 1: 可調至0.8V,5A
電壓/電流 - 輸出 2: 可調至0.8V,150mA
帶 LED 驅動器:
帶監控器:
帶序列發生器:
電源電壓: 2.4 V ~ 9.8 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應商設備封裝: 10-MSOP
包裝: 帶卷 (TR)
13
LTC3700
3700f
APPLICATIONS INFORMATION
U
U
U
The selection of C
OUT
 is driven by the required effective
series resistance (ESR). Typically, once the ESR require-
ment is satisfied, the capacitance is adequate for filtering.
The output ripple (V
OUT
) is approximated by:
V   I   ESR
fC
OUT  RIPPLE
OUT
H
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
8
where f is the operating frequency, C
OUT
 is the output
capacitance and I
RIPPLE
 is the ripple current in the induc-
tor. The output ripple is highest at maximum input voltage
since I
L
 increases with input voltage.
Manufacturers such as Nichicon, United Chemicon and
Sanyo should be considered for high performance through-
hole capacitors. The OS-CON semiconductor dielectric
capacitor available from Sanyo has the lowest ESR (size)
product of any aluminum electrolytic at a somewhat
higher price. Once the ESR requirement for C
OUT
 has been
met, the RMS current rating generally far exceeds the
I
RIPPLE(P-P)
 requirement.
Figure 3. Line Regulation of V
REF
 and V
ITH
INPUT VOLTAGE (V)
2.0
105
100
95
90
85
80
75
2.2    2.4    2.6    2.8
3700 F03
3.0
V
REF
V
ITH
In surface mount applications, multiple capacitors may
have to be paralleled to meet the ESR or RMS current
handling requirements of the application. Aluminum elec-
trolytic and dry tantalum capacitors are both available in
surface mount configurations. In the case of tantalum, it is
critical that the capacitors are surge tested for use in
switching power supplies. An excellent choice is the AVX
TPS, AVX TPSV and KEMET T510 series of surface mount
tantalum, available in case heights ranging from 2mm to
4mm. Other capacitor types include Sanyo OS-CON,
Nichicon PL series and Panasonic SP.
Low Supply Voltage Operation
Although the LTC3700 can function down to 2.1V (typ),
the maximum allowable output current is reduced when
V
IN
 decreases below 3V. Figure 3 shows the amount of
change as the supply is reduced down to 2.2V. Also shown
in Figure 3 is the effect of V
IN
 on V
REF
 as V
IN
 goes below
2.3V.
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