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參數資料
| 型號： | MAX1884EUP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Fixed-Point Digital Signal Processor 256-BGA |
| 中文描述： | 2.05 A SWITCHING REGULATOR, 625 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, 1.10 MM HEIGHT, MO-153AC, TSSOP-20 |
| 文件頁數： | 21/38頁 |
| 文件大小： | 1051K |
| 代理商： | MAX1884EUP |
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M
Quad-Output TFT LCD DC-DC
Converters with Buffer
______________________________________________________________________________________
21
The switching waveforms will appear noisy and asyn-
chronous when light loading causes pulse-skipping
operation; this is a normal operating condition that
improves light-load efficiency.
Dual Charge-Pump Regulator (MAX1778/
MAX1880/MAX1881/MAX1882 Only)
The MAX1778/MAX1880/MAX1881/MAX1882 con-
trollers contain two independent low-power charge
pumps (Figure 4). One charge pump inverts the input
voltage and provides a regulated negative output volt-
age. The second charge pump doubles the input volt-
age and provides a regulated positive output voltage.
The controllers contain internal P-channel and N-chan-
nel MOSFETs to control the power transfer. The
internal MOSFETs switch at a constant frequency
(fCHP = fOSC/2).
Positive Charge Pump
During the first half-cycle, the N-channel MOSFET turns
on and charges flying capacitor C
X(POS)
(Figure 4).
This initial charge is controlled by the variable N-chan-
nel on-resistance. During the second half-cycle, the N-
channel MOSFET turns off and the P-channel MOSFET
turns on, level shifting C
X(POS)
by V
SUPP
volts. This
connects C
X(POS)
in parallel with the reservoir capaci-
tor C
OUT(POS)
. If the voltage across C
OUT(POS)
plus a
diode drop (V
POS
+ V
DIODE
) is smaller than the level-
shifted flying capacitor voltage (V
CX(POS)
+ V
SUPP
),
charge flows from C
X(POS)
to C
OUT(POS)
until the diode
(D3) turns off.
I
I
LOAD
t
ON
t
OFF
TIME
I
PEAK
Figure 3. Discontinuous-to-Continuous Conduction Crossover
Point
MAX1778
MAX1880
MAX1881
MAX1882
V
NEG
= -
V
REF
V
REF
= 1.25V
R5
R6
R5
R6
C
OUT(NEG)
C
X(NEG)
V
2.7V TO 13V
OSC
REF
PGND
GND
SUPN
DRVN
FBN
SUPP
DRVP
FBP
D4
D5
V
POS
= 1 + R3
V
REF
V
REF
= 1.25V
R4
V
2.7V TO 13V
V
SUPD
D2
D3
C
REF
0.22
μ
F
V
REF
1.25V
R4
C
X(POS)
C
OUT(POS)
V
POS
V
NEG
R3
Figure 4. Low-Power Charge Pump Block Diagram
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1885EUP | Fixed-Point Digital Signal Processor 256-BGA |
| MAX1778EUG | Quad-Output TFT LCD DC-DC Converters with Buffer |
| MAX1880EUG | Quad-Output TFT LCD DC-DC Converters with Buffer |
| MAX1881EUG | Quad-Output TFT LCD DC-DC Converters with Buffer |
| MAX1882EUG | Quad-Output TFT LCD DC-DC Converters with Buffer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1884EUP-T | 功能描述:LCD 驅動器 Quad-Output TFT LCD DC-DC Converter with Buffer RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率: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 |
| MAX1885EUP | 功能描述:LCD 驅動器 Quad-Output TFT LCD DC-DC Converter with Buffer RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率: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 |
| MAX1885EUP-T | 功能描述:LCD 驅動器 Quad-Output TFT LCD DC-DC Converter with Buffer RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率: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 |
| MAX1886ESA+ | 制造商:Maxim Integrated Products 功能描述:HIGH-CURRENT VCOM DRIVE BUFFER - Rail/Tube |
| MAX1886EUK | 制造商:Maxim Integrated Products 功能描述:HIGH-CURRENT VCOM DRIVE BUFFER - Rail/Tube |
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