6 Detailed Description

6.1 Overview

The TL103Wx features two high-voltage amplifiers and a shunt voltage reference to allow for cost-sensitive and

compact battery charger CC/CV feedback circuits. The upgraded TL103WB features is designed to provide a

wide supply range (up to 36V), low offset voltage (±0.3mV typical) and a 1.2MHz bandwidth. The integrated

voltage reference is tied to the non-inverting pin of one of OP AMP 1 and provides a fixed 2.5V referenced to

the negative supply of the device. The shunt reference of the TL103WA/TL103WB features a tight tolerance of

0.44% at 25°C.

When a single supply voltage of 5V is used (or ±2.5V split supply), the TL103Wx internal reference allows

for a more accurate and power-efficient mid-supply signal to be used throughout your circuit. The TL103W/

TL103WA devices are characterized for operation from -40°C to 85°C, the TL103WB devices are characterized

for operation from –40°C to 125°C.

6.2 Functional Block Diagram

V

CC+

1OUT

+

-

1

2

3

4

8

7

6

5

1IN+

1IN–

2IN+

2IN–

2OUT

V

REF

OP

AMP 1

+

-

OP

AMP 2

V

CC-

6.3 Feature Description

6.3.1 Internal Reference

The TL103Wx family features an internal shunt reference, tied to the non-inverting pin of one of the devices

amplifiers. When supplied with enough voltage headroom (≥ 2.5V) and cathode current (0.5mA typical), the

reference of the TL103Wx is forced to a fixed 2.5V. To not exceed the maximum cathode current, be sure that

the reference input is current limited. Unlike many linear regulators, the reference of the TL103W is internally

compensated to be stable without an output capacitor between the cathode and anode. If the reference is used

to supply a load, stability criteria shown in Figure 5-22 needs to be met.

Reference voltage tolerance varies based off the device grade chosen. At 25°C the TL103W features a

reference tolerance of 0.72%, while the TL103WA/TL103WB both feature reference tolerances of 0.44%.

6.3.2 Input Common Mode Range

The valid common mode range is from device ground to VCC+ – 1.5V (VCC+ – 2V across temperature). Inputs

may exceed VCC+ up to the absolute maximum voltage without device damage. At least one input must be in

the valid input common-mode range for the output to be the correct phase. If both inputs exceed the valid range,

then the output phase is undefined. If either input is more than 0.3V below VCC- then input current should be

limited to 1mA and the output phase is undefined.

TL103W, TL103WA, TL103WB

SLOS437R – APRIL 2004 – REVISED APRIL 2024

www.ti.com

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