參數(shù)資料
型號(hào)： MAX1747
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： Triple Charge-Pump TFT LCD DC-DC Converter
中文描述： 三路電荷泵TFT LCD DC-DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 9/13頁(yè)
文件大小： 401K
代理商： MAX1747
M
Triple Charge-Pump TFT LCD
DC-DC Converter
_______________________________________________________________________________________
9
(V
POS
) and a negative output (V
NEG
). These two out-
puts use external diode and capacitor stages (as many
stages as required) to regulate output voltages above
+35V and under -35V.
A proprietary regulation algorithm minimizes output rip-
ple as well as capacitor sizes for all three charge
pumps. Also included in the MAX1747 are a precision
1.25V reference that sources up to 50μA, shutdown,
power-up sequencing, fault detection, and an active-
low open-drain ready output.
Main Charge Pump
During the first half-cycle, the MAX1747 charges the
flying capacitor (CX) by connecting it between the sup-
ply voltage (V
SUPM
) and ground (Figure 2). This initial
charge is controlled by the variable N-channel on-resis-
tance. During the second half-cycle, the MAX1747 level
shifts the flying capacitor by stacking the voltage
across CX on top of the supply voltage. This transfers
the sum of the two voltages to the output capacitor
(C
OUT
).
Dual Charge-Pump Regulators
The MAX1747 contains two individual low-power
charge pumps. Using a single stage, the first charge
pump inverts the supply voltage (V
SUPN
) and provides
a regulated negative output voltage. The second
charge pump doubles the supply voltage (V
SUPP
) and
provides a regulated positive output voltage. The
MAX1747 contains internal P-channel and N-channel
MOSFETs to control the power transfer. The internal
MOSFETs switch at a constant frequency set by the
current into the shutdown pin (see
Frequency Selection
and Shutdown
).
V
OUT
+5V, 200mA
V
IN
= 3.0V
D6
D5
D8
CIN
10
μ
F
R7
100k
R
FREQ
100k
C1
0.1
μ
F
C5
0.1
μ
F
D3
D4
C6
1.0
μ
F
C9
0.1
μ
F
D7
V
-7V, 10mA
C10
1.0
μ
F
R5
280k
R6
49.9k
CREF
0.22
μ
F
CX
0.47
μ
F
C11
0.1
μ
F
C12
0.1
μ
F
C
OUT
(2) 4.7
μ
F
R1
150k
R2
49.9k
D1
D2
C7
0.1
μ
F
C3
0.1
μ
F
C4
1.0
μ
F
V
POS
+12V, 5mA
C8
1.0
μ
F
R3
432k
R4
49.9k
C
1500pF
SUPM
IN
RDY
SHDN
DRVN
FBN
REF
TGND
GND
CXP
CXN
OUT
SUPP
SUPN
FB
DRVP
FBP
INTG
PGND
MAX1747
Figure 1. Typical Application Circuit
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1747EUP 功能描述:電荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
MAX1747EUP+ 功能描述:電荷泵 Triple Charge-Pump TFT LCD DC/DC Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
MAX1747EUP+T 功能描述:電荷泵 Triple Charge-Pump TFT LCD DC/DC Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
MAX1747EUP-T 功能描述:電荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
MAX1747EVKIT 功能描述:電源管理IC開(kāi)發(fā)工具 MAX1747 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
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