Overview
The A5973ADTR is a step-down monolithic power switching regulator produced by STMicroelectronics. This device is capable of delivering up to 1.5 A DC current to the load, with an adjustable output voltage ranging from 1.235 V to the input voltage (VIN). The high current capability is facilitated by an HSOP8 package with an exposed frame, which reduces the thermal resistance junction-to-ambient (Rth(JA)) to approximately 40 °C/W. The regulator uses an internal P-channel DMOS transistor with a typical RDS(on) of 250 mΩ, minimizing the need for external components. It operates with an internally fixed switching frequency of 500 kHz and supports input voltages from 4 V to 36 V, making it suitable for automotive applications, including operation in cold crank conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4 to 36 | V |
| Output Current | Up to 1.5 A | A |
| Output Voltage Range | 1.235 V to VIN | V |
| Switching Frequency | 500 kHz ± 15% | kHz |
| MOSFET On Resistance (RDS(on)) | 0.250 to 0.5 | Ω |
| Maximum Thermal Resistance Junction-Ambient (Rth(JA)) | Approximately 40 | °C/W |
| Operating Junction Temperature Range | -40 to 150 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Reference Voltage | 3.3 V ± 2% | V |
Key Features
- Qualified following the AEC-Q100 requirements for automotive applications.
- Up to 1.5 A DC output current.
- Operating input voltage from 4 V to 36 V.
- 3.3 V reference voltage with ± 2% accuracy.
- Output voltage adjustable from 1.235 V to VIN.
- Low dropout operation with 100% duty cycle.
- Internally fixed switching frequency of 500 kHz.
- Voltage feed-forward and zero load current operation.
- Internal current limiting and inhibit function for zero current consumption.
- Synchronization and protection against feedback disconnection.
- Thermal shutdown protection.
Applications
The A5973ADTR is dedicated to automotive applications, particularly where high reliability and performance are required. It is suitable for use in various automotive systems that need efficient power management, including those operating under cold crank conditions.
Q & A
- What is the maximum output current of the A5973ADTR?
The A5973ADTR can deliver up to 1.5 A DC current to the load.
- What is the input voltage range of the A5973ADTR?
The input voltage range is from 4 V to 36 V.
- What is the adjustable output voltage range of the A5973ADTR?
The output voltage can be adjusted from 1.235 V to the input voltage (VIN).
- What is the switching frequency of the A5973ADTR?
The switching frequency is internally fixed at 500 kHz ± 15%.
- Does the A5973ADTR have thermal protection?
- What is the typical RDS(on) of the internal P-channel DMOS transistor?
The typical RDS(on) is 250 mΩ.
- Is the A5973ADTR qualified for automotive applications?
- What is the maximum thermal resistance junction-ambient (Rth(JA)) of the A5973ADTR?
The maximum thermal resistance junction-ambient (Rth(JA)) is approximately 40 °C/W.
- Does the A5973ADTR support synchronization?
- What is the reference voltage provided by the A5973ADTR?
The reference voltage is 3.3 V with ± 2% accuracy.
