參數(shù)資料
型號(hào)： MAX861IUA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
中文描述： SWITCHED CAPACITOR CONVERTER, 250 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 1.11 MM HEIGHT, UMAX-8
文件頁(yè)數(shù)： 7/12頁(yè)
文件大?。?/td> 142K
代理商： MAX861IUA
M
50mA, Frequenc y-S elec table,
S witc hed-Capac itor Voltage Converters
_______________________________________________________________________________________
7
__________Applic ations Information
Capac itor S elec tion
The MAX860/MAX861 are tested using 10μF capacitors
for both C1 and C2, although smaller or larger values
can be used (Table 3). Smaller C1 values increase the
output resistance; larger values reduce the output
resistance. Above a certain point, increasing the
capacitance of C1 has a negligible effect (because the
output resistance becomes dominated by the internal
switch resistance and the capacitor ESR). Low-ESR
capacitors provide the lowest output resistance and
ripple voltage. The output resistance of the entire circuit
(inverter or doubler) is approximately:
R
OUT
= R
O
+ 4 x ESR
C1
+ ESR
C2
+ 1 / (f
S
x C1)
where R
O
(the effective resistance of the MAX860/
MAX861’s internal switches) is approximately 8
and f
S
is the switching frequency. R
OUT
is typically 12
when
using capacitors with 0.2
ESR and f
S
, C1, and C2 val-
ues suggested in Table 3. When C1 and C2 are so
large (or the switching frequency is so high) that the
internal switch resistance dominates the output resis-
tance, estimate the output resistance as follows:
R
OUT
= R
O
+ 4 x ESR
C1
+ ESR
C2
A typical design procedure is as follows:
1) Choose C1 and C2 to be the same, for convenience.
2) Select f
S
:
a) If you want to avoid a specific noise frequency,
choose f
S
appropriately.
b) If you want to minimize capacitor cost and size,
choose a high f
S
.
c) If you want to minimize current consumption,
choose a low f
S
.
3) Choose a capacitor based on Table 3, although
higher or lower values can be used to optimize per-
formance. Table 4 lists manufacturers who provide
low-ESR capacitors.
*In addition to Table 3, four graphs in the Typical
Operating Characteristics section show typical output
current for C1 and C2 capacitances ranging from
0.33μF to 22μF. Output current is plotted for inputs of
4.5V (5V - 10%) and 3.0V (3.3V - 10%), and also for
10% and 20% output droop from the ideal -V
IN
value.
ATTRIBUTE
LOWER
FREQUENCY
Larger
Larger
Smaller
HIGHER
FREQUENCY
Smaller
Smaller
Larger
Output Ripple
C1, C2 Values
Supply Current
C1, C2 (μF)
NOMINAL FREQUENCY (kHz)
6
68
13
47
50
10
100
4.7
130
4.7
250
2.2
Table 2. Switching-Frequency Trade-Offs
Table 3. Suggested Capacitor Values*
Table 4. Low-ESR Capacitor Manufacturers
MANUFACTURER–Series
PHONE
FAX
COMMENTS
AVX TPS Series
(803) 946-0629
(803) 626-3123
Low-ESR tantalum, SMT
AVX TAG Series
(803) 946-0629
(803) 626-3123
Low-cost tantalum, SMT
Matsuo 267 Series
(714) 969-2491
(714) 960-6492
Low-cost tantalum, SMT
Sprague 595 Series
(603) 224-1961
(613) 224-1430
Low-ESR tantalum, SMT
Sanyo MV-GX Series
(619) 661-6835
(619) 661-1055
Aluminum electrolytic, through hole
Sanyo CV-GX Series
(619) 661-6835
(619) 661-1055
Aluminum electrolytic, SMT
Nichicon PL Series
(847) 843-7500
(847) 843-2798
Aluminum electrolytic, through hole
United Chemicon (Marcon)
(847) 696-2000
(847) 696-9278
Ceramic SMT
TDK
(847) 390-4461
(847) 390-4405
Ceramic SMT
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX861IUA+ 功能描述:電荷泵 50mA f-Selectable Switched-Cap V Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
MAX861IUA+T 功能描述:電荷泵 50mA f-Selectable Switched-Cap V Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
MAX861IUA-T 功能描述:電荷泵 50mA f-Selectable Switched-Cap V Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
MAX861IUA-TG069 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX861MJA 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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