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參數(shù)資料
| 型號(hào)： | MAX1748 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Triple-Output TFT LCD DC-DC Converter |
| 中文描述： | 三輸出TFT-LCD DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 277K |
| 代理商： | MAX1748 |
M
Triple-Output TFT LCD DC-DC Converter
The MAX1748
’
s fast current-limit circuitry allows the use
of soft-saturation inductors while still protecting the IC.
The inductor
’
s DC resistance significantly affects effi-
ciency. For best performance, select inductors with
resistance less than the internal N-channel FET resis-
tance. To minimize radiated noise in sensitive applica-
tions, use a shielded inductor.
The inductor should have as low a series resistance as
possible. For continuous inductor current, the power
loss in the inductor resistance, P
LR
, is approximated by:
P
LR
(I
MAIN
V
MAIN
/ V
IN
)
2
R
L
where R
L
is the inductor series resistance.
Output Capacitor
A 10μF capacitor works well in most applications. The
equivalent series resistance (ESR) of the output filter
capacitor affects efficiency and output ripple. Output
voltage ripple is largely the product of the peak induc-
tor current and the output capacitor ESR. Use low-ESR
ceramic capacitors for best performance. Low-ESR,
surface-mount tantalum capacitors with higher capacity
may be used for load transients with high peak cur-
rents. Voltage ratings and temperature characteristics
should be considered.
Input Capacitor
The input capacitor (C
IN
) in boost designs reduces the
current peaks drawn from the input supply and reduces
noise injection. The value of C
IN
is largely determined
by the source impedance of the input supply. High
source impedance requires high input capacitance,
particularly as the input voltage falls. Since step-up DC-
DC converters act as
“
constant-power
”
loads to their
input supply, input current rises as input voltage falls. A
good starting point is to use the same capacitance
value for C
IN
as for C
OUT
. Table 1 lists suggested com-
ponent suppliers.
Integrator Capacitor
The MAX1748 contains an internal current integrator
that improves the DC load regulation but increases the
peak-to-peak transient voltage (see the load-transient
waveforms in the
Typical Operating Characteristics
).
For highly accurate DC load regulation, enable the cur-
rent integrator by connecting a 470pF capacitor to
INTG. To minimize the peak-to-peak transient voltage at
the expense of DC regulation, disable the integrator by
connecting INTG to REF and adding a 100k
resistor
to GND.
Rectifier Diode
Use a Schottky diode with an average current rating
equal to or greater than the peak inductor current, and
a voltage rating at least 1.5 times the main output volt-
age (V
MAIN
).
Charge Pump
Efficiency Considerations
The efficiency characteristics of the MAX1748 regulated
charge pumps are similar to a linear regulator. They are
dominated by quiescent current at low output currents
and by the input voltage at higher output currents (see
Typical Operating Characteristics
). So the maximum
efficiency may be approximated by:
Efficiency
V
NEG
/ [V
IN
N];
for the negative charge pump
Efficiency
V
POS
/ [V
IN
(N + 1)];
for the positive charge pump
where N is the number of charge-pump stages.
Output Voltage Selection
Adjust the positive output voltage by connecting a volt-
age-divider from the output (V
POS
) to FBP to GND (see
Typical Operating Circuit
). Adjust the negative output
SUPPLIER
INDUCTORS
Coilcraft
Coiltronics
Sumida USA
Toko
CAPACITORS
AVX
Kemet
Sanyo
Taiyo Yuden
DIODES
PHONE
FAX
847-639-6400
561-241-7876
847-956-0666
847-297-0070
847-639-1469
561-241-9339
847-956-0702
847-699-1194
803-946-0690
408-986-0424
619-661-6835
408-573-4150
803-626-3123
408-986-1442
619-661-1055
408-573-4159
Central
Semiconductor
516-435-1110
516-435-1824
International
Rectifier
310-322-3331
310-322-3332
Motorola
Nihon
Zetex
602-303-5454
847-843-7500
516-543-7100
602-994-6430
847-843-2798
516-864-7630
Table 1. Component Suppliers
12
______________________________________________________________________________________
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX17480EVKIT+ | 功能描述:電源管理IC開發(fā)工具 MAX17480 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX17480GTL+ | 功能描述:顯示驅(qū)動(dòng)器和控制器 2-/3-Output Mobile erial VID Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX17480GTL+T | 功能描述:顯示驅(qū)動(dòng)器和控制器 2-/3-Output Mobile erial VID Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX17482GTL+ | 功能描述:電壓模式 PWM 控制器 NDA IC RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX17482GTL+T | 功能描述:電壓模式 PWM 控制器 NDA IC RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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