Introduction
The TLE7368-2E device is a multi-function power supply circuit designed for automotive powertrain systems using standard 12 V batteries. The device is designed to power and monitor a family of next-generation 32-bit microcontrollers (13 µm lithography) that require voltage levels of 5 V, 3.3 V, or 1.5/1.2/1.3 V. The regulator follows the concept of its predecessor, the TLE6368/SONIC.
The regulator follows the concept of its predecessor, the TLE6368/SONIC, in which the output of a pre-conditioner feeds the input of a miniature linear power supply. Specifically, the TLE7368 cascades a buck converter with a linear regulator and voltage follower to achieve the lowest power dissipation. This configuration powers the application even at high ambient temperatures.
The buck converter provides a pre-regulated voltage of 5.5 V and a minimum peak current of 2.5 A. The buck converter consists of two low voltage regulators and a voltage follower. The buck converter is supplied with high accuracy voltages of 5 V and 3.3 V (2.6 V) by two low dropout linear post regulators. The current capabilities of the regulators are 800 mA and 700 mA, respectively. 3.3 V (2.6 V) linear regulators have their own inputs, allowing a buck to be inserted from the buck outputs if necessary to reduce power dissipation on the chip. For the same reason of reducing the power dissipation on the chip, the core power supply (1.5 V, 1.2 V or 1.3 V) utilises an integrated control circuit concept with an external power stage.
Features
Highly efficient next-generation microcontroller power supply
Wide battery input voltage range < 4.5 V to 45 V
Operating temperature range Tj = -40 °C to +150 °C
Pre-regulator to reduce overall power loss: Integrated current-mode buck converter 5.5 V/2.5 A
Post-regulators, e.g. for system and controller I/O supply: LDO1: 5 V ±2%, 800 mA current limit, LDO2: 3.3 V ±2% or 2.6 V ±2% (optional output), 700 mA current limit
Integrated linear regulator control circuitry to power the controller chip: LDO3 control for external NPN power stage: 1.2V ±2%
Backup regulator for off-board power supply: 2 tracking regulators that follow the main 5 V regulator at 105 mA and 50 mA
Backup regulator with very low current consumption: linear voltage regulator for backup power, e.g., for memory circuits, output voltage selectable in hardware between 1.0 V or 2.6 V, current 30 mA, separate battery input isolated from buck regulator inputs
Hardware controlled on/off logic
Undervoltage detection: undervoltage reset circuitry with adjustable power-on reset delay time, backup power supply with undervoltage monitoring circuitry
Window watchdog circuit
Over-current protection for all regulators
Controller power sequencing
Over-temperature shutdown
Packages: Low Rthja Power-P-DSO-36 package, PG-DSO-36 small thermal pad package
PG-DSO-36 only: environmentally friendly product (RoHS compliant)
AEC certified
Advantages
High efficiency for complex power systems
Low standby mode current consumption
Easy implementation of multi-rail systems
µC monitoring via reset generator and windowed watchdog
Thermally enhanced thermal pad package for wider temperature range
Potential Applications
Powertrain: Transmission, EMS
Safety: EPS
Contact Us
Tel: +86 13410018555
Email: sales@hkmjd.com
Company homepage: www.hkmjd.com
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