MSK5953RH M. S Kennedy, MSK5953RH Datasheet - Page 4

• Manufacturer Part Number: MSK5953RH
• Description: Rad Hard Dual Positive Ldo Adj Voltage Regulat Rad Hard Dual Positive Ldo Adj Voltage Regulator
• Manufacturer: M. S Kennedy

IMPROVING INITIAL ACCURACY AND
REDUCING TEMPERATURE DRIFT
pin current tolerance and set point resistor accuracy can be
reduced to 0.2% using the MSK 109RH radiation hardened
precision reference. Minimal drift of the MSK 109RH from
temperature extremes and irradiation ensure very tight regu-
lation. The circuit can be configured to use the 2.5V refer-
ence to directly set the output at 2.5V or with a slight varia-
tion it can provide any output within the operating range of
the MSK 5953RH down to 0V output. Select R
between 1mA and 10mA of current through the reference;
see Figure 4 below. R
source. The optional trim resistor can be used to further trim
out initial output and system error. Reference the MSK 109RH
data sheet for application circuits that provide stable output
voltages across the full operating range of the MSK 5953RH
including down to 0V output and the operating characteris-
tics of the MSK 109RH.
ADDING SHUTDOWN
ing R
ground. By connecting two transistors, as shown in Figure 5,
a low current voltage source is all that is required to take the
set pin to ground as well as pull the output voltage to ground.
Q2 pulls the output voltage to ground when no load is present
and only needs to sink 10mA. Use a low leakage switching
diode between VOUT and SET to avoid overstress during shut-
down transitions.
The initial output accuracy of the MSK 5953RH due to set
APPLICATION NOTES CONT'D
The MSK 5953RH can be easily shutdown by either reduc-
APPLICATION NOTES CONT'D
SET
to 0 or connecting a transistor from the set pin to
S
may be tied to VIN or another power
FIGURE 5
FIGURE 4
S
to maintain
4
COINCIDENT TRACKING
tight control over voltage differentials, the coincident track-
ing shown in Figure 6 may be used. In this configuration
regulator B is configured for an output voltage of 0.8V with
reference to output A. Output B will never exceed output A
by more than 0.8V but will be 3.3V with respect to ground
when output A is at the specified 2.5V. Although a very
small portion of the overall current, it should be noted that
load connected to regulator A must sink the 10µA set pin
current of regulator B.
For applications that require multiple output voltages and
FIGURE 6
PRELIMINARY Rev. A 9/09