參數(shù)資料
型號： MAX863EEE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Dual, High-Efficiency, PFM, Step-Up DC-DC Controller
中文描述： DUAL SWITCHING CONTROLLER, PDSO16
封裝： 0.150 INCH, 0.025 INCH PITCH, QSOP-16
文件頁數(shù)： 13/16頁
文件大小： 194K
代理商： MAX863EEE
M
Dual, High-Effic ienc y, PFM, S tep-Up
DC-DC Controller
______________________________________________________________________________________
13
Voltage ripple is the sum of contributions associated
with ESR and the capacitor value, as shown below:
V
RIPPLE
V
RIPPLE,ESR
+ V
RIPPLE,C
To simplify selection, assume that 75% of the ripple
results from ESR and that 25% results from the capaci-
tor value. Voltage ripple as a consequence of ESR is
approximated by:
V
RIPPLE,ESR
R
ESR
x I
PEAK
so:
Estimate input and output capacitor values for a given
voltage ripple as follows:
where V is the input or output voltage, depending on
which capacitor is being calculated.
Choose input capacitors with working voltage ratings
over the maximum input voltage, and output capacitors
with working voltage ratings higher than their respec-
tive outputs.
Add V
DD
and REF Bypass Capac itors
Bypass the MAX863 with 0.1μF or higher value ceramic
capacitors placed as close to the V
DD
, REF, and GND
pins as possible.
S et the Output V oltage
DC-DC converter 1 operates with a 3.3V, 5V, or
adjustable output. For a preset output, connect
SENSE1 to OUT1 (Figures 2 and 4a), then set FB1 to
V
DD
for 3.3V operation or to GND for 5V operation. For
an adjustable output, connect a resistor voltage divider
to the FB1 pin (Figure 7). In adjustable output circuits,
connect SENSE1 to GND.
DC-DC converter 2 can be adjusted from very high
voltages down to V
IN
using external resistors connect-
ed to the FB2 pin, as shown in Figure 7. Select feed-
back resistor R2 in the 10k
to 500k
range. R1 is
given by:
where 1.25V is the voltage of the internal reference.
R1 = R2
V
1.25V
OUT
1
C
0.5L x I
V
RIPPLE,C
x V
2PEAK
≥
R
V
I
PEAK
ESR
RIPPLE,ESR
≤
MAX863
FB1 OR FB2
C
OUT
C1
(OPTIONAL)
R1
R2
C2
(OPTIONAL FOR HIGH-
VOLTAGE CIRCUITS)
V
OUT1
OR
V
OUT2
Figure 7. Adjustable Output Circuit
Table 1. Component Suppliers
PHONE
Inductors
Coilcraft
SUPPLIER
Marcon/United
Chemi-Con
(847) 696-2000
TDK
Vishay/Vitramon
(847) 390-4373
(203) 268-6261
(847) 390-4428
(203) 452-5670
Large-Value Ceramic Capacitors
(847) 696-9278
Motorola
Current-Sense Resistors
(602) 303-5454
AVX
Sanyo USA
Sprague
(803) 946-0690
(619) 661-6835
(603) 224-1961
(619) 661-1055
(603) 224-1430
Electrolytic Capacitors
(803) 626-3123
Dale/Vishay
IRC
(402) 564-3131
(512) 992-7900
(402) 563-6418
(512) 992-3377
(602) 994-6430
Sumida USA
MOSFETs and Diodes
(847) 956-0666
Central Semiconductor
International Rectifier
(516) 435-1110
(310) 322-3331
(516) 435-1824
(310) 322-3232
(847) 956-0702
Coiltronics
Dale Inductors
(561) 241-7876
(605) 668-4131
(561) 241-9339
(605) 665-1627
FAX
(847) 639-1469
(847) 639-6400
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX863EEE+ 功能描述:DC/DC 開關(guān)控制器 Dual PFM Step-Up DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX863EEE+T 功能描述:DC/DC 開關(guān)控制器 Dual PFM Step-Up DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX863EEE-T 功能描述:DC/DC 開關(guān)控制器 Dual PFM Step-Up DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX863EVKIT 功能描述:DC/DC 開關(guān)控制器 Evaluation Kit for the MAX863 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX8640EVKIT 制造商:Maxim Integrated Products 功能描述:500MA 4MHZ/2MHZ SYNCHRONOUS STEP-D - Rail/Tube
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