CO

MP-O

U

T

1

COMP-OUT

6

COMP-OUT

1

COMP-OUT

2

IREF

3

FOUT

4

GND

7

VINF

8

VS

5

RC_TIME

1

RC_TIME

2

GND

2

LOAD

1

VINF

2

GND

LM231, LM331

SNOSBI2C – JUNE 1999 – REVISED SEPTEMBER 2015

www.ti.com

10 Power Supply Recommendations

The LMx31 can operate over a wide supply voltage range of 4 V to 40 V. For proper operation, the supply pin

should be bypassing to ground with a low-ESR, 1-µF capacitor. It is acceptable to use X7R capacitors for this.

For systems using higher supply voltages, ensure that the voltage rating for the bypass caps is sufficient.

11 Layout

11.1 Layout Guidelines

Bypass capacitors must be placed as close as possible to the supply pin. As the LM331 is a through-hole device,

it is acceptable to place the bypass capacitor on the bottom layer.

If an input capacitor to ground is used to clean the input signal, the capacitor should be placed close to the

supply pin.

Use of a ground plane is recommended to provide a low-impedance ground across the circuit.

11.2 Layout Example

Figure 31. Layout Example

18

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