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參數(shù)資料
| 型號： | MAX844 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Noise, Regulated, -2V GaAsFET Bias(低噪,已調(diào)整的,-2V砷化鎵場效應(yīng)管偏置電源) |
| 中文描述： | 低噪聲、穩(wěn)壓型、-2V GaAsFET偏置電源 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 180K |
| 代理商： | MAX844 |
_______________General Desc ription
The MAX840/MAX843/MAX844 low-noise, inverting
charge-pump power supplies are ideal for biasing
GaAsFETs in cellular telephone transmitter amplifiers.
They operate with inputs down to 2.5V.
The MAX840 offers both a -2V preset output and a -0.5V
to -9.4V adjustable output. The MAX843/MAX844 use
an external positive control voltage to set the negative
output voltage. Input voltage range for all the devices is
2.5V to 10V, and output current is 4mA with V
IN
> 2.7V.
These circuits can operate with small capacitors, as low
as 0.22μF.
An internal linear regulator reduces the MAX840’s out-
put voltage ripple to 1mVp-p. With a well-filtered control
voltage (V
CTRL
), the MAX843/MAX844 also achieve less
than 1mVp-p typical output ripple. Supply current is
750μA, and reduces to less than 1μA in shutdown
(MAX840/MAX843). The MAX844’s unregulated output
is active in shutdown, with the charge pump switching at
20kHz. It provides a low-power LCD supply.
________________________Applic ations
Cellular Phones
GaAsFET Power Amplifier Modules
Personal Communicators, PDAs
Wireless Data Loggers
Continuously Adjustable GaAsFET Bias
LCD-Bias Contrast Control
Regulated Negative Power Supplies
____________________________Features
o
Fixed -2V or Adjustable -0.5V to -9.4V Output
at 4mA (MAX840)
o
2.5V to 10V Input Voltage Range
o
Operate with Small Capacitors (as low as 0.22μF)
o
1mVp-p Output Voltage Ripple
o
Charge-Pump Switching Frequency:
100kHz in Normal Operation
20kHz in Shutdown Mode (MAX844)
o
1μA Max Logic-Level Shutdown Over Temp.
(MAX840/MAX843)
o
Small 8-Pin SO Package
M
Low-Noise, Regulated, -2V GaAsFET Bias
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1
( ) ARE FOR MAX843/MAX844
1
2
3
4
8
7
6
5
IN
GND
OUT
FB (CONT)
SHDN
NEGOUT
C1-
C1+
MAX840
MAX843
MAX844
SO
TOP VIEW
__________________Pin Configuration
MAX840
FB
OUT
SHDN
NEGOUT
C1-
C1+
IN
GND
V
IN
= 2.5V to 10.0V
(3 CELLS)
0.22
μ
F
V
OUT
= -2.0V
(V
GG
of GaAsFET)
4.7
μ
F
0.22
μ
F
0.22
μ
F
ON/OFF
__________Typic al Operating Circ uit
19-0388; Rev 1; 3/96
PART
MAX840
C/D
MAX840ISA
MAX840ESA
MAX843
C/D
MAX843ISA
MAX843ESA
MAX844
C/D
MAX844ISA
MAX844ESA
-40°C to +85°C
0°C to +70°C
-25°C to +85°C
-40°C to +85°C
0°C to +70°C
-25°C to +85°C
-40°C to +85°C
-25°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
Dice*
8 SO
8 SO
Dice*
8 SO
8 SO
Dice*
8 SO
8 SO
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
______________Ordering Information
*Dice are specified at T
A
= +25°C only.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX844ESA | 功能描述:電荷泵 Regulated -2V GaAsFET Bias 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 |
| MAX844ESA+ | 功能描述:電荷泵 Regulated -2V GaAsFET Bias 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 |
| MAX844ESA+T | 功能描述:電荷泵 Regulated -2V GaAsFET Bias 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 |
| MAX844ESA-T | 功能描述:電荷泵 Regulated -2V GaAsFET Bias 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 |
| MAX844ISA | 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 |
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