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參數(shù)資料
| 型號(hào)： | MAX1747EUP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple Charge-Pump TFT LCD DC-DC Converter |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, 1.10 MM HEIGHT, TSSOP-20 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 401K |
| 代理商： | MAX1747EUP |
M
Triple Charge-Pump TFT LCD
DC-DC Converter
8
_______________________________________________________________________________________
Detailed Description
The MAX1747 is an efficient triple-output power supply
for TFT LCD applications. The device contains one
high-power charge pump and two low-power charge
pumps. The MAX1747 charge pumps switch continu-
ously at a constant frequency, so the output noise con-
tains well-defined frequency components, and the
circuit requires much smaller external capacitors for a
given output ripple. The adjustable switching frequency
is set by the current into the shutdown pin (see
Frequency Selection and Shutdown
).
The main charge pump uses internal MOSFETs with
low R
ON
to provide high output current. The adjustable
output voltage of the main charge pump can be set up
to 5.5V with external resistors. The dual low-power
charge pumps independently regulate a positive output
PIN
1, 2
3
NAME
TGND
RDY
FUNCTION
Must be connected to ground.
Active-Low Open-Drain Output. Indicates all outputs are ready. The R
ON
is 125
(typ).
Main Charge-Pump Feedback Input. Regulates to 1.25V nominal. Connect to the center of a
feedback resistive divider between the main output (OUT) and analog ground (GND).
4
FB
5
INTG
Main Charge-Pump Integrator Output. If used, connect 1500pF to analog ground (GND). To disable
the integrator, connect to GND.
6
IN
Supply Input. +2.7V to +4.5V input range. Powers only the logic and reference. Bypass to analog
ground (GND) with a 0.1
μ
F capacitor as close to the pin as possible.
Analog Ground. Connect to power ground (PGND) underneath the IC.
7
GND
8
REF
Internal Reference Bypass Terminal. Connect a 0.22
μ
F capacitor from this terminal to analog
ground (GND). External load capability to 50
μ
A. REF is disabled in shutdown.
9
FBP
Positive Charge-Pump Feedback Input. Regulates to 1.25V nominal. Connect feedback resistive
divider to analog ground (GND).
10
FBN
Negative Charge-Pump Regulator Feedback Input. Regulates to 0V nominal. Connect feedback
resistive divider to the reference (REF).
11
SHDN
Shutdown Input. Drive
SHDN
through an external resistor. When
SHDN
is pulled low, the device
turns off and draws only 0.1
μ
A. OUT is also pulled low through an internal 10
resistor in shutdown
mode. When current is sourced into
SHDN
through R
FREQ
, the device activates, and the
SHDN
input current sets the oscillator
’
s switching frequency:
R
FREQ
(k
) = 45.5 (MHz / mA)
(V
ON
- 0.7V) / f
OSC
(MHz)
12
DRVN
Negative Charge-Pump Driver Output. Output high level is V
SUPN
, and low level is PGND.
Negative Charge-Pump Driver Supply Voltage. Bypass to power ground (PGND) with a 0.1
μ
F
capacitor.
13
SUPN
14
DRVP
Positive Charge-Pump Driver Output. Output high level is V
SUPP
and low level is PGND.
Positive Charge-Pump Driver Supply Voltage. Bypass to power ground (PGND) with a 0.1
μ
F
capacitor.
15
SUPP
16
17
18
19
PGND
CXN
SUPM
CXP
Power Ground. Connect to analog ground (GND) underneath the IC.
Negative Terminal of the Main Charge-Pump Flying Capacitor
Main Charge-Pump Supply Voltage Input
Positive Terminal of the Main Charge-Pump Flying Capacitor
20
OUT
Main Charge-Pump Output. Bypass to power ground (PGND) with 10
μ
F for a 1MHz application
(see
Output Capacitor Selection
). An internal 10
resistor discharges the output when the device
is shut down.
Pin Description
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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 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 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| 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 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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