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| 型号： | MAX844ISA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/10页 |
| 文件大小： | 0K |
| 描述： | IC BIAS GAASFET REG 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 充电泵，手机发射器 |
| 输入电压： | 2.5 V ~ 10 V |
| 输出数： | 1 |
| 输出电压： | -2V |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
MANUA
ION KIT
EV ALUAT TA SHEET
FOLLO
19-0388; Rev 1; 3/96
L
WS DA
Low-Noise, Regulated, -2V GaAsFET Bias
_______________General Description
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.
____________________________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
______________Ordering Information
________________________Applications
Cellular Phones
GaAsFET Power Amplifier Modules
Personal Communicators, PDAs
Wireless Data Loggers
Continuously Adjustable GaAsFET Bias
LCD-Bias Contrast Control
Regulated Negative Power Supplies
__________Typical Operating Circuit
PART
MAX840 C/D
MAX840ISA
MAX840ESA
MAX843 C/D
MAX843ISA
MAX843ESA
MAX844 C/D
MAX844ISA
MAX844ESA
TEMP. RANGE
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
0°C to +70°C
-25°C to +85°C
-40°C to +85°C
PIN-PACKAGE
Dice*
8 SO
8 SO
Dice*
8 SO
8 SO
Dice*
8 SO
8 SO
* Dice are specified at T A = +25°C only.
V IN = 2.5V to 10.0V
(3 CELLS)
IN
0.22 μ F
__________________Pin Configuration
0.22 μ F
C1+
C1-
MAX840
OUT
V OUT = -2.0V
(V GG of GaAsFET)
4.7 μ F
TOP VIEW
C1+ 1
8
IN
0.22 μ F
NEGOUT
C1- 2
NEGOUT 3
SHDN 4
MAX840
MAX843
MAX844
7
6
5
GND
OUT
FB (CONT)
ON/OFF
SHDN
GND
FB
( ) ARE FOR MAX843/MAX844
SO
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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