MCP1502 datasheet(17/28 Pages) MICROCHIP

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DS20006593A-page 17

MCP1502

5.1.2

LOAD CAPACITOR

The maximum capacitive load without series resistance

is 10 nF. However, larger capacitors may be imple-

mented if a resistor is used in series with a larger load

capacitor. Refer to Figure 3-29, Figure 3-30 and

Figure 3-31 for the transient response with the series

resistor and capacitive load.

5.1.3

PRINTED CIRCUIT BOARD LAYOUT

CONSIDERATIONS

Mechanical stress due to Printed Circuit Board (PCB)

mounting can cause the output voltage to shift from its

initial value. To reduce stress-related output voltage

shifts, mount the reference on low stress areas of the

PCB (i.e., away from PCB edges, screw holes and

large components).

5.2

Typical Applications Circuits

5.2.1

NEGATIVE VOLTAGE REFERENCE

A negative voltage reference can be generated using any

of the devices in the MCP1502 family. A typical applica-

tion is shown in Figure 5-3. In this circuit, the voltage

inversion is implemented using the MCP6061 and two

equal resistors. The voltage at the output of the

MCP1502 voltage reference drives R1, which is con-

nected to the inverting input of the MCP6061 amplifier.

Since the noninverting input of the amplifier is biased to

ground, the inverting input will also be close to ground

potential. The second 10 kΩ

resistor is placed around the

feedback loop of the amplifier. Since the inverting input of

the amplifier is high-impedance, the current generated

through R1 will also flow through R2. As a consequence,

the output voltage of the amplifier is equal to -2.5V for the

MCP1502-25 and -4.096V for the MCP1502-40.

FIGURE 5-3:

Negative Voltage Reference.

VDD

SHDN

GND

OUT

GND

2.2 μF

2.7-5.5V

10 k

0.1%

10 k

0.1%

-5V

-2.500V

MCP1502-25

MCP6061

1 nF

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