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參數(shù)資料
| 型號(hào)： | MAX8726EUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple-Output TFT-LCD DC-DC Converters |
| 中文描述： | 2 A SWITCHING REGULATOR, 1250 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, 1.10 MM HEIGHT, 0.65 MM PITCH, MO-153-AB, TSSOP-16 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 640K |
| 代理商： | MAX8726EUE |
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M
Triple-Output TFT-LCD
DC-DC Converters
The inductance value is then given by:
Considering the typical application circuit, the maximum
DC load current (I
MAIN(MAX)
) is 200mA with a 10V output.
A 6.8μH inductance value is then chosen, based on the
above equations and using 85% efficiency and a 1MHz
operating frequency. Smaller inductance values typically
offer a smaller physical size for a given series resistance
and current rating, allowing the smallest overall circuit
dimensions. However, due to higher peak inductor
currents, the output voltage ripple (I
PEAK
x output filter
capacitor ESR) will be higher.
Use inductors with a ferrite core or equivalent; powder
iron cores are not recommended for use with the
MAX1748/MAX8726s’ high switching frequencies. The
inductor’s maximum current rating should exceed
I
PEAK
. Under fault conditions, inductor current may
reach up to 2.0A. The MAX1748/MAX8726s’ fast cur-
rent-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
xV
MAIN
/ V
IN
)
2
xR
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 convert-
ers 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 component suppliers.
Integrator Capacitor
The MAX1748/MAX8726 contain 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 regula-
tion, enable the current integrator by connecting a
470pF capacitor to INTG. To minimize the peak-to-peak
transient voltage at the expense of DC regulation, dis-
able 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
).
L
V
Efficiency
(V
V
)
V
LIR
I
f
IN(MIN)
2
MAIN
IN(MIN)
(MAIN)
2
MAIN(MAX)
OSC
=
×
×
×
×
×
Table 1. Component Suppliers
12
______________________________________________________________________________________
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8726EUE+ | 功能描述:LCD 驅(qū)動(dòng)器 Triple-Out TFT-LCD DC/DC Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX8726EUE+T | 功能描述:LCD 驅(qū)動(dòng)器 Triple-Out TFT-LCD DC/DC Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX8726EUE-T | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX8727ETB | 制造商:Maxim Integrated Products 功能描述:TFT-LCD STEP-UP DC-DC CONVERTER - Rail/Tube |
| MAX8727ETB+ | 制造商:Maxim Integrated Products 功能描述:TFT-LCD STEP-UP DC-DC CONVERTER - Rail/Tube |
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