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STMicroelectronics A5970D013TR
- Part No.:
- A5970D013TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
A5970D013TR.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,544
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Product details
Overview
A5970D013TR from STMicroelectronics is an AEC-Q100-qualified monolithic step-down switching regulator delivering up to 1 A DC output current, operating from 4 V to 36 V input, with adjustable output voltage (1.235 V to VIN), 250 kHz fixed switching frequency, and integrated P-channel DMOS switch (RDS(on) = 250 mΩ typ). It is designed for automotive power rails requiring cold-crank operation and robust protection.
For engineers reviewing the A5970D013TR datasheet, A5970D013TR pinout, A5970D013TR application, or A5970D013TR equivalent, key selection criteria include its 1.35 A minimum current limit, 3.3 V ±2% reference, inhibit-controlled zero-current standby mode, thermal shutdown at 150 °C, and synchronization capability for multi-rail noise reduction.
Technical Context
The A5970D013TR implements a voltage-mode PWM controller with internal 3.3 V reference and transconductance error amplifier (gm = 2.3 mS, 65 dB open-loop gain), feeding a 250 kHz sawtooth oscillator with voltage feedforward. Its P-channel high-side switch enables 100% duty-cycle low-dropout operation without bootstrap capacitor.
Protection architecture includes dual-stage current limiting-pulse-by-pulse overcurrent detection plus frequency foldback-and dedicated circuits for feedback disconnection detection, output overvoltage protection (OVP threshold = 1.3 × VFB), and thermal shutdown with 20 °C hysteresis. The INH pin provides active-high disable with internal pull-up and <100 µA standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports automotive battery systems including cold-crank (4 V min) and load-dump transients. |
| Output Current | Up to 1 A DC - limited by internal 1.35 A min current limit and thermal design; usable across full temperature range (-40 °C to +125 °C). |
| Switching Frequency | 250 kHz (±15%) - fixed internal oscillator enables predictable EMI filtering and simplifies inductor selection. |
| RDS(on) | 250 mΩ (typ) - low on-resistance P-channel DMOS reduces conduction loss and eliminates need for external high-side driver. |
| Reference Voltage | 3.3 V ±2% - stable internal VREF supplies bias and enables accurate feedback network design. |
| Feedback Threshold | 1.235 V (typ) - sets regulated output via external resistor divider; enables precise output programming from 1.235 V to VIN. |
| Quiescent Current | 3 mA (operating), 80–150 µA (standby with INH high) - supports always-on automotive modules with ultra-low sleep power. |
Pinout & Package
Package: SO-8 (Small Outline, 8-pin, surface-mount, standard JEDEC MS-012AC footprint with exposed pad for thermal enhancement).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Regulator output node | Switched output connected to LC filter; carries peak inductor current and high di/dt; requires low-inductance layout. |
| 2 SYNCH | Synchronization I/O | Configurable master/slave sync pin; accepts external clock ≥275 kHz or drives synchronized signal to other A5970D devices. |
| 3 INH | Inhibit control input | Active-high enable/disable; >2.2 V disables device (<100 µA IQ); <0.8 V enables; floating state disables via internal pull-up. |
| 4 COMP | Error amplifier output | Connects to external RC compensation network; sets loop stability and transient response of voltage regulation. |
| 5 FB | Feedback input | Senses output voltage via resistive divider; internal 1.235 V reference sets regulation point; open-circuit triggers shutdown. |
| 6 VREF | 3.3 V reference output | Stable, low-noise reference source; no capacitor required for stability; powers sync circuitry and external analog blocks. |
| 7 GND | Analog and power ground | Common return for feedback, reference, and control circuitry; must be tied to power ground with minimal impedance. |
| 8 VCC | Unregulated input supply | Main power input (4–36 V); powers internal regulator, gate driver, and logic; bypass capacitor mandatory near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage feedforward control | Compensates for input voltage variations in real time, improving line transient response without increasing loop gain. |
| Zero-load burst-mode operation | Enables stable regulation with no output load using P-channel switch - no bootstrap capacitor or auxiliary winding needed. |
| Feedback disconnection protection | Automatically disables regulator if FB pin floats, preventing uncontrolled high-duty-cycle output that could damage downstream loads. |
| Thermal shutdown with hysteresis | Shuts down at TJ = 150 °C ±10 °C and restarts only after cooling by ~20 °C, preventing thermal oscillation during overload. |
| Internal 3.3 V reference | Provides precision, low-drift reference for feedback and sync circuitry; eliminates need for external reference IC or trimming. |
Applications
| Body Control Module (BCM) | Infotainment Power Supply |
|---|---|
Use Scenario: Regulating 12 V battery to 5 V/3.3 V for microcontrollers, CAN transceivers, and sensors in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, AEC-Q100-compliant power with cold-crank support and fault resilience. Use Value: Enables single-chip 1 A solution with integrated switch and protection, reducing BOM count and PCB area vs discrete alternatives. |
Use Scenario: Generating clean 5 V rail for display controllers, audio codecs, and USB peripherals in head units under varying battery conditions. IC Role / Device Role / Timing Role: High-efficiency, low-noise step-down regulator synchronized with other power rails to suppress beat-frequency EMI. Use Value: 250 kHz fixed frequency and SYNCH pin allow deterministic EMI filtering and coexistence with camera or RF subsystems. |
| ADAS Camera Power | Telematics Control Unit (TCU) |
Use Scenario: Delivering tightly regulated 3.3 V to image sensor and ISP in rear-view or surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Automotive-grade buck converter with -40 °C to +125 °C guaranteed operation and thermal shutdown. Use Value: RDS(on) = 250 mΩ and 100% duty cycle capability maintain regulation during low-VIN cranking events without dropout. |
Use Scenario: Powering LTE modem, GNSS receiver, and secure MCU in cellular-connected vehicle gateways with always-on requirements. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator supporting deep-sleep modes via INH pin control and zero-load burst operation. Use Value: Standby current <100 µA extends battery life during ignition-off periods while enabling fast wake-up from inhibit state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | Fixed 5 V output, 5 A rating, 63 V max input, no AEC-Q100 qualification, external MOSFET required. | Targets industrial/non-automotive 5 V rails; lacks cold-crank support, sync, and inhibit features. | Select when higher current and wider input range are needed, and automotive qualification is not required. |
| TPS5430DDAR | 3 A output, 60 V max input, adjustable output, no integrated P-MOS, requires external high-side FET and bootstrap. | Used in harsh-environment industrial supplies; lacks AEC-Q100, VREF output, and feedback disconnect protection. | Choose for higher current and input voltage tolerance where board space allows external FET and driver complexity. |
Compared with LM2678-5.0/NOPB and TPS5430DDAR, the A5970D013TR delivers automotive-specific integration-AEC-Q100 qualification, cold-crank operation, built-in P-MOS, and comprehensive protection-with lower system-level component count and smaller footprint, at the cost of lower maximum current.
Availability
A5970D013TR is available at Aetrix Electronics and suitable for automotive body electronics, infotainment systems, ADAS camera modules, and telematics control units requiring stable component supply, long lifecycle assurance, and AEC-Q100 compliance.
Supply support for A5970D013TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade analog products.
The A5970D belongs to ST's automotive power management portfolio, engineered specifically for under-hood and cabin electronics requiring AEC-Q100 reliability, wide-input operation, and integrated protection against load dump, cold crank, and thermal stress.
FAQ
What is the minimum input voltage required for startup and regulation?
The A5970D013TR starts switching and regulates down to 4 V input, enabling reliable operation during automotive cold-crank conditions where battery voltage can dip to 3.5–4.0 V. Startup occurs once VCC exceeds the UVLO threshold with hysteresis; regulation remains stable across the full 4–36 V range with no dropout below 4 V.
Does the A5970D013TR require an external bootstrap capacitor?
No. Because it uses an integrated P-channel high-side MOSFET, the A5970D013TR does not require a bootstrap capacitor. This simplifies layout, eliminates boot-related failure modes, and enables true 100% duty-cycle operation for low-dropout regulation - critical for maintaining output during low-VIN events.
How does the synchronization feature work when multiple A5970D013TR devices are used?
When multiple A5970D013TR devices share a common SYNCH net, the unit with the highest natural switching frequency (up to 280 kHz) becomes the master and drives the shared clock; others operate as slaves locked to that frequency. This eliminates beat-frequency noise and simplifies EMI filter design across multi-rail automotive systems.
What happens if the FB pin is disconnected during operation?
If the FB pin is left floating or disconnected, the A5970D013TR detects open feedback and immediately disables the power stage to prevent uncontrolled high-duty-cycle output. This protection avoids overvoltage damage to downstream loads and is implemented independently of the error amplifier loop.
A5970D013TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 1A
- Frequency - Switching:
- 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
A5970D013TR FAQ
1.How can I place an order for A5970D013TR through Aetrix?
Please submit a Request for Quotation (RFQ) for A5970D013TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for A5970D013TR reliable?
The price and inventory of A5970D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5970D013TR is usually 5 days.
3.What payment methods are accepted for A5970D013TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5970D013TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A5970D013TR?
A5970D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A5970D013TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for A5970D013TR?
For technical support, including A5970D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5970D013TR requirements.
6.How does Aetrix verify that A5970D013TR is sourced from the original manufacturer or authorized distributors?
All A5970D013TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A5970D013TR meets industry standards.
7.What is the process for return or replacement of A5970D013TR?
All A5970D013TR units undergo pre-shipment inspection (PSI). If there is an issue with A5970D013TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The A5970D013TR part is unused and in its original packaging.
Return procedure for A5970D013TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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