TPS2661
SLVSFE3C – NOVEMBER 2020 – REVISED DECEMBER 2021
TPS2661x: 50-V, Universal 4–20 mA, ±20-mA Current Loop Protector With
Input and Output Miswiring Protection
universal input protection for ±20 mA, 0 mA to 20 mA,
1 Features
and 4 mA–20 mA. Low RON values of 7.5 Ω minimizes
drop in the current loop, thereby extending operating
range and supporting operation even with lower
voltage power supplies. The device can withstand and
protect the loads from positive and negative supply
voltages up to ±50 V. The MODE pin allows flexibility
to enable 2x current limit through the device to enable
proper start-up of two wire transmitters. Device is
capable of operating from an external bipolar supply
as low as ± 2.25 V to ±20 V. The device can also
be powered from unipolar supplies as low as 3 V
to 30 V. The TPS26610 and TPS26613 feature loop
power mode to facilitate loop testing in un-powered
state without ±Vs supplies.
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±50-V operating voltage, ±55-V absolute maximum
Integrated fixed bipolar 32-mA current limit
Allows 2x current limit at start-up
50% space savings compared to a typical discrete
protection circuit
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Low R-on: 7.5-Ω typical
Low IQ (< 100 nA) – current drawn from loop when
powered from external supply
Protection against miswiring conditions on IN and
OUT
Protection during signal line surge IEC61000-4-5
(with external TVS)
Criteria-A EFT (IEC61000-4-4) immunity (with
external TVS)
Supports loop testing without supply (TPS26610
only)
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The device also protects the system from output side
miswiring in analog outputs and sensor transmitters
by turning off the current path. The internal robust
protection control blocks along with the 50-V rating
of the TPS2661x help to protect against surge
(IEC61000-4-5) and EFT (IEC61000-4-4) transients
for signal lines. The device greatly reduces system
footprint by its 2.9-mm × 1.6-mm 8-pin SOT-23
package.
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HART compliant
Enable control
SGOOD for system health monitoring
Thermal shutdown
2 Applications
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Factory automation and control – PLCs - analog
input and output module
Motor drives control
HART inputs
HVAC controllers
Device Information(1)
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PART NUMBER
TPS26610
PACKAGE
BODY SIZE (NOM)
TPS26611
UART IO protection
Thermal controller
TPS26612
SOT-23 (8)
2.9 mm × 1.6 mm
TPS26613
3 Description
TPS26614
The TPS2661x is a compact, feature-rich, fully
integrated current loop protector suitable for analog
inputs, analog outputs, sensor transmitters, HART
inputs, and UART IO protection. The device provides
ANALOG INPUT MODULE
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
+Vs
SGOOD
MODE
TPS26610
I+
IN
OUT
+Vs
GND
-Vs
4 to 20 mA
20 mA
ADC
ILOOP
Current Inputs
Precision
Burden
Resistor
-Vs
GND
I-
x
no. of channels
Typical Circuit Schematic
Miswiring Protection on Input From Field Supply
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.