Overview
The LM5170-Q1, produced by Texas Instruments, is a multiphase bidirectional current controller designed specifically for automotive applications, particularly in 48-V and 12-V dual battery systems. This controller regulates the average current flowing between the high voltage (HV) and low voltage (LV) ports, based on the direction designated by the DIR input signal. It is AEC-Q100 qualified, ensuring it meets stringent automotive standards, and is functional safety-capable. The LM5170-Q1 features robust 5-A peak half-bridge gate drivers, precise current regulation, and various protection mechanisms, making it an essential component for high-performance and reliable automotive power systems.
Key Specifications
| Parameter | Specification |
|---|---|
| Package | HTQFP (PHP) with 48 pins |
| Operating Temperature Range | -40°C to 150°C |
| Device Temperature Grade | -40°C to +125°C ambient operating range |
| HBM ESD Classification | Level 2 |
| CDM ESD Classification | Level C4B |
| HV Port Max Rating | 100 V |
| LV Port Max Rating | 65 V |
| Current Regulation Accuracy | 1% |
| Channel Current Monitoring Accuracy | 1% |
| Peak Half-Bridge Gate Drivers | 5 A |
| Oscillator Frequency | Programmable with optional external clock synchronization |
Key Features
- AEC-Q100 qualified for automotive applications
- Functional Safety-Capable
- 1% accurate bidirectional current regulation and channel current monitoring
- 5-A peak half-bridge gate drivers capable of driving parallel MOSFET switches delivering 500 W or more per channel
- Programmable or adaptive dead-time control
- Programmable oscillator frequency with optional synchronization to external clock
- Independent channel enable control inputs and analog/digital channel current control inputs
- Programmable cycle-by-cycle peak current limit
- HV and LV port overvoltage protection
- Diode emulation prevents negative current and enables discontinuous mode operation for improved efficiency with light loads
- Programmable soft-start timer
- MOSFET failure detection at start-up and circuit breaker control
- Multiphase operation with phase adding or dropping capability
Applications
The LM5170-Q1 is primarily designed for automotive 48-V and 12-V dual battery systems. It is suitable for various applications including:
- Automotive power systems requiring high voltage and low voltage conversion
- Dual battery systems in electric and hybrid vehicles
- High-performance power conversion systems needing precise current regulation and robust protection features
Q & A
- What is the primary function of the LM5170-Q1?
The LM5170-Q1 is a multiphase bidirectional current controller that regulates the average current flowing between the high voltage and low voltage ports in automotive 48-V and 12-V dual battery systems. - What are the key qualifications of the LM5170-Q1 for automotive use?
The LM5170-Q1 is AEC-Q100 qualified and functional safety-capable, ensuring it meets stringent automotive standards. - What is the accuracy of the current regulation and channel current monitoring in the LM5170-Q1?
The LM5170-Q1 provides 1% accurate bidirectional current regulation and channel current monitoring. - What is the maximum rating of the HV and LV ports in the LM5170-Q1?
The HV port has a maximum rating of 100 V, and the LV port has a maximum rating of 65 V. - What protection features are included in the LM5170-Q1?
The LM5170-Q1 includes HV and LV port overvoltage protection, cycle-by-cycle current limiting, MOSFET failure detection, and overtemperature protection. - Can the LM5170-Q1 operate in multiphase configurations?
Yes, the LM5170-Q1 supports multiphase operation with the ability to add or drop phases. - What is the purpose of the diode emulation mode in the LM5170-Q1?
The diode emulation mode prevents negative currents and enables discontinuous mode operation for improved efficiency with light loads. - How are the gate drivers in the LM5170-Q1 characterized?
The LM5170-Q1 features robust 5-A peak half-bridge gate drivers capable of driving parallel MOSFET switches delivering 500 W or more per channel. - Can the oscillator frequency in the LM5170-Q1 be programmed?
Yes, the oscillator frequency is programmable with the option to synchronize to an external clock. - What is the significance of the programmable soft-start timer in the LM5170-Q1?
The programmable soft-start timer helps in managing the startup process to prevent inrush currents and ensure smooth operation.
