TLV9001, TLV9002, TLV9004
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SBOS833A –OCTOBER 2017–REVISED DECEMBER 2017
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TLV900x is a family of low-power, rail-to-rail input and output operational amplifiers specifically designed for
portable applications. The devices operate from 1.8 V to 5.5 V, are unity-gain stable, and are suitable for a wide
range of general-purpose applications. The class AB output stage is capable of driving ≤ 10-kΩ loads connected
to any point between V+ and V–. The input common-mode voltage range includes both rails, and allows the
TLV900x to be used in any single-supply application.
8.2 Typical Application
8.2.1 TLV900x Low-Side, Current Sensing Application
Figure 37 shows the TLV900x configured in a low-side current sensing application.
VBUS
ILOAD
ZLOAD
5V
+
TLV9002
VOUT
Þ
+
RSHUNT
0.1 Ω
VSHUNT
RF
57.6 kΩ
Þ
RG
1.2 kΩ
Copyright © 2017, Texas Instruments Incorporated
Figure 37. TLV900x in a Low-Side, Current-Sensing Application
8.2.1.1 Design Requirements
The design requirements for this design are:
•
•
•
Load current: 0 A to 1 A
Output voltage: 4.9 V
Maximum shunt voltage: 100 mV
8.2.1.2 Detailed Design Procedure
The transfer function of the circuit in Figure 37 is given in Equation 1:
VOUT = ILOAD ìRSHUNT ìGain
(1)
Copyright © 2017, Texas Instruments Incorporated
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