is moving very slowly across the switching threshold of the comparator. This problem can be prevented by using

the internal hysteresis feature of the comparator or by the addition of external hysteresis.

The TLV3603(E) has a LE/HYS pin that allows for variable internal hysteresis depending on the resistor value

connected between the pin and VEE, where increasing the resistance decreases the hysteresis to a minimum

level.

5 V

0 V

VL

VH

VO

2.485 V

2.515 V

VIN

+

LE/HYS

TLV3603

VO

VIN

VREF 2.5 V

VCC

VEE

R1

150 k

Ω

Figure 8-5. Adjustable Hysteresis with a 150kΩ Resistor using TLV3603

Since the TLV3601 and TLV3602 only have a minimal amount of internal hysteresis, external hysteresis can be

added in the form of a positive feedback loop. A non-inverting comparator with hysteresis requires a two-resistor

network and a voltage reference (VREF) at the inverting input, as shown in Figure 8-6.

VREF 2.5 V

R2

10 k

+

–

R1

60

VO

VA

5 V

0 V

VL

VH

VO

2.485 V

2.515 V

VIN

VIN

Figure 8-6. Non-Inverting Configuration for Hysteresis using TLV3601

8.2.1.1 Design Requirements

For this design, follow these design requirements.

Table 8-1. Design Parameters

PARAMETER

VALUE

Supply Voltage (VCC)

5 V

VREF

2.5 V

VHYS

30 mV

Lower Threshold (VL)

2.485 V

Upper Threshold (VH)

2.515 V

8.2.1.2 Detailed Design Procedure

For the TLV3603(E), the hysteresis vs. resistance curve (Figure 8-2) can be used as a guidance to set the

desired amount of hysteresis. Figure 8-2 shows that for a 30-mV hysteresis, a 150 kΩ resistor must be placed

from the LE/HYS pin to VEE.

For the TLV3601 and TLV3602, the following procedure can be used to add external hysteresis for a non-

inverting configuration. Note that VHYST << VREF, so VHYST can be ignored and is not included in the following

equations for simpler calculation.

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TLV3601, TLV3602, TLV3603, TLV3603E

SNOSDB1E – JUNE 2021 – REVISED APRIL 2023

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