MAX844 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX844 Datasheet PDF : 10 Pages
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Low-Noise, Regulated, -2V GaAsFET Bias
______________________________________________________________Pin Description
PIN
MAX840
1
MAX843
MAX844
1
2
2
3
3
4
4
5
—
NAME
C1+
C1-
NEGOUT
SHDN
FB
FUNCTION
Positive Terminal for C1
Negative Terminal for C1
Negative Output Voltage (unregulated)
Active-Low, TTL Logic-Level Shutdown Input
Dual Mode™ Feedback Input. When FB is grounded, the output is preset to -2V. To
select other output voltages, connect FB to an external resistor divider (Figure 2b).
—
5
CONT
Control Voltage Input. To set VOUT, connect a resistor divider between OUT and a
positive control voltage between 0V and 10V (Figure 2c).
6
6
OUT
Regulated Negative Output Voltage
7
7
GND
Ground
8
8
IN
Positive Power-Supply Input
Dual Mode is a trademark of Maxim Integrated Products.
C1+
C1-
NEGOUT
CHARGE
PUMP
N
IN
MAX840
OUT
SHDN
-0.5V
REF
FB
CONNECT TO
GND TO SET
VOUT = -2V
GND
C1+
C1-
NEGOUT
SHDN
CHARGE
PUMP
N
IN
MAX843
MAX844
OUT
R2
CONT
R1
GND
CONTROL
VOLTAGE
Figure 1a. MAX840 Block Diagram
Figure 1b. MAX843/MAX844 Block Diagram
_______________________________________________________________________________________ 7
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