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BTS824R from EPCOS

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BTS824R

Manufacturer: EPCOS, INFINEON

Smart High Side Switches

Partnumber Manufacturer Quantity Availability
BTS824R EPCOS, INFINEON 320 In Stock

Description and Introduction

Smart High Side Switches The BTS824R is a high-side power switch manufactured by Infineon. Here are its key specifications:

- **Output Current**: 24 A (continuous)
- **Operating Voltage**: 5.5 V to 28 V
- **On-State Resistance (RDS(on))**: Typically 16 mΩ at 25°C
- **Protection Features**: Overcurrent, overtemperature, short-circuit, and reverse polarity protection
- **Logic-Level Input**: Compatible with 3.3 V and 5 V microcontrollers
- **Package**: PG-TO263-7 (D2PAK-7)
- **Diagnostic Feedback**: Current sense and status flag outputs
- **Switching Frequency**: Suitable for PWM applications
- **Operating Temperature Range**: -40°C to 150°C
- **Applications**: Automotive and industrial systems, such as motor control and power distribution

This information is based solely on Infineon's datasheet for the BTS824R.

Application Scenarios & Design Considerations

Smart High Side Switches# Technical Documentation: BTS824R High-Side Power Switch

 Manufacturer : INFINEON  
 Component Type : Dual-Channel High-Side Power Switch with Diagnostic Feedback  
 Primary Function : Intelligent power switching for resistive, inductive, and capacitive loads in automotive and industrial applications.

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## 1. Application Scenarios (≈45% of Content)

### Typical Use Cases
The BTS824R is designed as a robust, protected dual-channel high-side switch, commonly employed to drive medium-current loads directly from a microcontroller. Each channel integrates a vertical N-channel power MOSFET with charge pump, protection circuits, and diagnostic feedback.

 Primary Use Cases Include: 
-  Direct Load Control:  Driving lamps (incandescent, LEDs), solenoids, valves, motors (DC, small stepper), and heating elements.
-  Load Diagnostics:  Detecting open-load, short-to-ground, short-to-battery, and overtemperature conditions via the status feedback pin.
-  PWM Capability:  Suitable for pulse-width modulation (typical frequency up to 1 kHz) for dimming or speed control, thanks to its integrated free-wheeling diodes.

### Industry Applications
1.  Automotive Body Electronics: 
   -  Powertrain:  Fuel injectors, EGR valves, idle speed actuators.
   -  Comfort & Body:  Seat heaters, window lifters, mirror adjustment, interior lighting, door lock actuators.
   -  Advanced Driver-Assistance Systems (ADAS):  Sensor cleaning systems, small actuator control.

2.  Industrial Automation: 
   - Control of small actuators, conveyor belt motors, and indicator lamps.
   - Programmable Logic Controller (PLC) output modules requiring diagnostic feedback.

3.  Consumer/Appliance: 
   - White goods (washing machine water valves, dishwasher pumps).
   - Professional coffee machines, vending machines.

### Practical Advantages and Limitations

 Advantages: 
-  High Integration:  Combines power switch, protection (overload, short circuit, overtemperature, undervoltage), and diagnostics in one package (PG-DSO-20).
-  Excellent Diagnostic Feedback (IST):  Analog current sense output provides precise load current monitoring for fault detection and predictive maintenance.
-  Robust Protection:  Active clamp for inductive turn-off, electrostatic discharge (ESD) protection, and load dump resilience (up to 40V).
-  Low Quiescent Current:  Suitable for always-on or battery-sensitive applications.
-  Green Product (RoHS compliant):  Meets modern environmental standards.

 Limitations: 
-  Current Handling:  Maximum continuous current per channel is limited (see datasheet, e.g., 8A typical). Not suitable for very high-power applications.
-  Power Dissipation:  Junction temperature management is critical. Continuous high-current operation may require significant heatsinking.
-  Diagnostic Complexity:  Interpreting the analog current sense signal (IST) requires an ADC on the microcontroller and proper software algorithms.
-  Cost:  Higher unit cost compared to discrete MOSFET solutions, justified by integrated protection and diagnostics.

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## 2. Design Considerations (≈35% of Content)

### Common Design Pitfalls and Solutions
| Pitfall | Consequence | Solution |
| :--- | :--- | :--- |
|  Insufficient Heatsinking  | Thermal shutdown, reduced reliability, premature failure. | Calculate max. power dissipation (PD = I2 * RDS(on)). Use adequate PCB copper area (thermal pads), consider external heatsink for high ambient temperatures. |
|  Ignoring Inductive Kickback  | Voltage spikes exceeding VDS max, potentially damaging the switch. | Utilize the integrated clamp diode. For highly inductive loads, ensure the clamp energy (EAS) is within limits. Add

Alternative Part Number

  • AUIR3315S --: Smart high-side power switch with comparable current rating and protection features, suitable replacement for automotive load control.
  • VND5N07-E --: High-side driver with similar voltage and current capability, includes thermal and short-circuit protection.
  • BTS50085-1TMB --: PROFET high-side switch offering similar RDS(on) and current handling, drop-in style alternative for power switching applications.
  • BTS7008-2EPA --: PROFET+2 12V dual-channel high-side switch with comparable RDS(on) and current rating, improved protection features, and pin-compatible family design.
  • VND7020AJ-E --: VIPower high-side driver with comparable on-resistance and current handling, usable as a cross-manufacturer alternative with layout adjustments.

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