參數(shù)資料
型號(hào)： MAX1882
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： Quad-Output TFT LCD DC-DC Converters with Buffer
中文描述： 四路輸出、TFT LCD DC-DC轉(zhuǎn)換器，帶有緩沖器
文件頁數(shù)： 28/38頁
文件大?。?/td> 1051K
代理商： MAX1882
M
Quad-Output TFT LCD DC-DC
Converters with Buffer
28
______________________________________________________________________________________
Charge-Pump Input Power and
Efficiency Considerations
The charge pumps in the MAX1778/MAX1880/
MAX1881/MAX1882 provide regulated output voltages
by controlling the voltage drop across the low-side N-
channel MOSFET, so they can be modeled as linear
regulators followed by an unregulated charge pump
when determining the input power requirements and
efficiency.
The charge pump only provides charge to the output
capacitor during half the period (50% duty cycle), so
the input current is a function of the number of stages
and the load current:
for the positive charge pump, and:
for the negative charge pump, where N is the number
of charge pump stages.
The efficiency characteristics of the MAX1778/
MAX1880/MAX1881/MAX1882 regulated charge
pumps are similar to a linear regulator. It is dominated
by quiescent current at low output currents and by the
I
I
N
(
SUPP
POS
)
=
+
1
CIRCUIT #6
3.3V
9V
100mA
-5V
2mA
24V
2mA
4.7
μ
H
>1A
4.7
μ
F
309k
49.9k
None
CIRCUIT #7
3.3V
9V
100mA
-5V
2mA
24V
2mA
10
μ
H
>1A
10
μ
F
309k
49.9k
None
CIRCUIT #8
3.3V
9V
200mA
-5V
5mA
24V
5mA
10
μ
H
>1A
10
μ
F
309k
49.9k
None
CIRCUIT #9
3.3V
9V
200mA
-5V
5mA
24V
5mA
10
μ
H
>1A
20
μ
F
309k
49.9k
20k
*
200pF*
V
IN
V
MAIN
I
MAIN(MAX)
V
NEG
I
NEG
V
POS
I
POS
L
I
PEAK
C
OUT
R1
R2
R
COMP
C
COMP
None
None
None
Table 2. MAX1881/MAX1882/MAX1884/MAX1885 Component Values (f
OSC
= 500kHz)
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 3. Component Suppliers
*R
COMP
and C
COMP
are connected between the step-up converter
’
s output (V
MAIN
) and FB.
I
I
N
(
SUPP
POS
)
=
+
1
相關(guān)PDF資料
PDF描述
MAX1883 Quad-Output TFT LCD DC-DC Converters with Buffer
MAX1884 Quad-Output TFT LCD DC-DC Converters with Buffer
MAX1885 Quad-Output TFT LCD DC-DC Converters with Buffer
MAX1883EUP Replaced by TMS320C6211B : Fixed-Point Digital Signal Processor 256-BGA 0 to 0
MAX1884EUP Fixed-Point Digital Signal Processor 256-BGA
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1882EUG 功能描述:LCD 驅(qū)動(dòng)器 Quad-Output TFT LCD DC-DC Converter with Buffer 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
MAX1882EUG-T 功能描述:LCD 驅(qū)動(dòng)器 Quad-Output TFT LCD DC-DC Converter with Buffer 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
MAX1883EUP 功能描述:LCD 驅(qū)動(dòng)器 Quad-Output TFT LCD DC-DC Converter with Buffer 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
MAX1883EUP-T 功能描述:LCD 驅(qū)動(dòng)器 Quad-Output TFT LCD DC-DC Converter with Buffer 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
MAX1884EUP 功能描述:LCD 驅(qū)動(dòng)器 Quad-Output TFT LCD DC-DC Converter with Buffer 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
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