Automotive Telematics Control Unit (T-Box)

ICs ideal for T-Box

ICs ideal for Telematics Control Unit

1. Overview

A Telematics-Box (T-Box) is an automotive ECU handling bidirectional communications between a vehicle and the outside world. A T-Box enabling V2X (Vehicle-to-Everything) communications is essential in a connected car. T-Box-equipped vehicles can provide functions such as emergency call (eCall), which is mandatory in Europe, OTA (Over the Air), which is used for maintenance and information updates, receiving traffic information and tracking stolen vehicles.
A T-Box, the device enabling “Connected”, the “C” in the “CASE” acronym, requires stable communications.
ABLIC's lineup includes the industry's smallest connection diagnosis ICs for supplying power to GNSS antenna amplifiers, LDOs that supply clean power to communication chips, backup RTCs (real-time clocks) and the industry's lowest current consumption LDOs ideal for powering backup RTCs. ABLIC provides a number of ICs ideal for a T-Box.

ICs ideal for T-Box

2. Block circuit

Click the product name for more ​product information.

Telematics control unit block diagram

*VD: Voltage detector (Reset IC)   *LDO: Low-dropout regulator   *WDT: Watchdog timer   *RTC: Real-time clock

3. ICs ideal for T-Box

Product Recommended product Applications and Features
Step-up Controller
(Switching regulator)
S-19990 Low voltage operation (from 3.0V). Low noise. 60μA quiescent current. The industry's smallest package.
LDO Regulator with a current monitor function S-19700/1 Used for diagnosing GNSS antenna connections. An LDO regulator IC capable of detecting a variety of connection faults. It can also be used for backup battery charging circuits.
High side switch with a current monitor function S-19680 Used for diagnosing GNSS antenna connections. Detects short and open circuits and can output alarm signals.
LDO Regulator
(Linear Regulator)
S-19246 Powers WiFi. 10V input, 2A output current. Built-in soft start function.
LDO Regulator
(Linear Regulator)
S-19255 5.5V input, 300mA output current, PSRR 80dB. Available in an ultra compact (1.0 x 1.0mm) package. 0.1μF input capacitors can be used.
LDO Regulator
(Linear Regulator)
S-19212 Powers the microphone. The output voltage can be set between 2.5 to 16V.
LDO Regulator
(Linear Regulator)
S-19310 Powers and monitors the real-time clock. Industry's lowest current consumption of 2.2µA. With reset function.
Watchdog Timer S-19400/1 Industryʼs top class super-low current consumption 3.8µA. With reset function. Available in 2.0 x 3.0mm package.
Battery Monitoring IC
(Voltage detector)
S-19113 Provides undervoltage monitoring. Built-in SENSE Pin reverse connection protection circuit. Current consumption of 0.6µA.
Real-Time Clock S-35390A H Backup of clock function. Current consumption of 0.25µA. 105°C max. operation.
Serial EEPROM. Built-in data protection functions. 105°C max. operation.

4. Features

LDO Regulator S-19255 series
Ultra-compact package

Automotive, 125°C Operation, 5.5 V Input, 300 mA Voltage Regulator S-19255 Series

High PSRR helps shrink T-Box size!!

The industry's smallest package uses 1.0mm square HSNT-4(1010)B, and small capacitors can be used. It can also be provided in a standard SOT-23-5 package. In addition, the IC delivers high PSRR over a wide frequency range dispensing with the need for noise eliminating circuits.

 ≫Learning more about the S-19255

Series name



 Output current: 300mA

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LDO Regulator S-19310 series
Ultra-low current consumption

Automotive, 125°C Operation, 36 V Input, 40 mA Voltage Regulator with Reset Function S-19310 Series

Industry's lowest current consumption reduces T-Box standby current

This LDO regulator offers a 36V input, 40mA output, a reset function for monitoring the output voltage of internal LDO regulators and an ultra-low current consumption of 2.2μA (typ.), and is used as a timer IC power supply to create a backup timer with ultra-low current consumption. These features combine to contribute to lowering T-Box standby current.

≫Learning more about the S-19310

Series name



 Output voltage: 2.9 V ~ 5.3 V

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