Silicon Labs TS1107-20ITQ1633T

Overview

TS1107-20ITQ1633T from Silicon Labs is a high-side bidirectional current-sense amplifier with internal latching current-limit comparator, 20 V/V gain, 150 µV max input offset voltage, ±1% max gain error, and 2 V to 27 V input common-mode range - used for overcurrent detection and load monitoring in battery-powered systems.

For engineers reviewing the TS1107-20ITQ1633T datasheet, TS1107-20ITQ1633T pinout, TS1107-20ITQ1633T application, or TS1107-20ITQ1633T equivalent, key selection considerations include bidirectional sensing capability, programmable current-limit threshold via external reference, latch-reset control via CLATCH, low quiescent supply current (1.15 µA typ), and compatibility with Kelvin-sense PCB layouts for precision measurement.

Technical Context

The TS1107-20ITQ1633T implements a fully differential, high-side current-sense amplifier with dual PMOS input stage enabling true bidirectional operation without dead zone at zero-crossing. Its transimpedance output buffer delivers VOUT = VBIAS ± ILOAD × RSENSE × (ROUT / RGAIN), where RGAIN = 2 kΩ and ROUT = 40 kΩ for 20 V/V gain.

It integrates a latching current-limit comparator with CIN– tied to OUT and CIN+ accepting an external threshold voltage; latch enable requires CLATCH = HIGH, and reset occurs only when CLATCH is strobed or held LOW. Unlike the TS1110, this variant lacks FET gate drive - it provides only current sensing and fault signaling via COUT.

Key Specifications

Pinout & Package

TS1107-20ITQ1633T uses a 16-pin 3 mm × 3 mm TQFN package with exposed thermal pad (EPAD), optimized for low-noise current sensing and PCB thermal management. Pin 1 is marked by a laser-etched circle in the lower-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current-sense amplifier applications.

Compared with MAX40056ATA+T and INA240A1QDRQ1, TS1107-20ITQ1633T uniquely combines bidirectional sensing, latched fault signaling, and ultra-low supply current in a 3 mm × 3 mm package - making it optimal for space-constrained, battery-sensitive, and energy-flow-aware designs.

Availability

TS1107-20ITQ1633T is available at Aetrix Electronics and suitable for portable/battery-powered systems, smart chargers, and industrial controls requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TS1107-20ITQ1633T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Silicon Labs is a fabless semiconductor company specializing in precision analog, timing, and mixed-signal ICs for energy-efficient, connected systems.

The TS1107 series belongs to Silicon Labs' electronic circuit protection product line, engineered specifically for high-accuracy, low-power current monitoring and overcurrent response in portable, industrial, and battery-management applications.

FAQ

What is the function of the FILT pin on the TS1107-20ITQ1633T?

The FILT pin on the TS1107-20ITQ1633T provides access to the inverting terminal of the transimpedance amplifier, allowing designers to add an external RC filter (e.g., 4 kΩ + 0.47 µF to GND) to reduce high-frequency noise at the OUT pin. This internal node enables effective 50 kHz differential low-pass filtering without degrading gain accuracy or introducing offset errors associated with external passive filters - a key advantage over discrete solutions.

Does the TS1107-20ITQ1633T support bidirectional current sensing, and how is direction indicated?

Yes, the TS1107-20ITQ1633T supports true bidirectional current sensing with no dead zone at zero-crossing. Direction is indicated by the SIGN output: logic HIGH when VRS+ > VRS– (positive current flow), and logic LOW when VRS– > VRS+ (reverse current). This feature is implemented via dual PMOS input stages that alternately conduct based on sense voltage polarity - enabling precise energy flow tracking in battery charge/discharge and regenerative braking applications.

Can the TS1107-20ITQ1633T drive an external P-channel MOSFET directly?

No, the TS1107-20ITQ1633T does not include FET gate drive capability. Unlike the TS1110 variant, the TS1107-20ITQ1633T has a no-connect (NC) on Pin 13 and provides only current sensing and latched comparator output (COUT). To implement circuit breaker functionality, an external comparator or microcontroller must interpret COUT and drive the gate of a P-channel MOSFET - whereas the TS1110-20ITQ1633T integrates that FET control logic.

What is the recommended method to set the current-limit threshold for the TS1107-20ITQ1633T?

The current-limit threshold for the TS1107-20ITQ1633T is set by applying a precise voltage to the CIN+ pin, while connecting CIN– to the OUT pin. This configuration compares the amplified sense voltage against the external reference. A resistor divider from VDD or a DAC output can provide the threshold voltage; for example, 750 mV on CIN+ triggers fault detection when |ILOAD × RSENSE| × 20 ≥ 750 mV. The latch remains active until CLATCH is pulled LOW - ensuring reliable fault capture even during brief transients.

How does the VREF pin affect biasing in the TS1107-20ITQ1633T?

The VREF pin on the TS1107-20ITQ1633T activates an internal 9.2 MΩ voltage divider when ≥ 0.9 V is applied, generating VBIAS at exactly 50% of VREF - e.g., 1.0 V on VREF yields 0.5 V on VBIAS. When VREF is grounded, the divider is disabled and VBIAS floats (must be left open). This eliminates external bias resistors and improves accuracy by removing matching and drift errors - a design advantage for stable, low-component-count current-sense front-ends.