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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics A5970ADTR

Name: A5970ADTR
Brand: STMicroelectronics
SKU: A5970ADTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A5970ADTR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: A5970ADTR.pdf

Description:: IC REG BUCK ADJ 1A 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

A5970ADTR from STMicroelectronics is an AEC-Q100-qualified automotive step-down switching regulator featuring a 1 A DC output current, 4–36 V input voltage range, and internal P-channel DMOS switch (R_DS(on) = 250 mΩ typ.). It delivers adjustable output voltages from 1.235 V to V_IN, supports cold-crank operation down to 4 V, and integrates 500 kHz fixed-frequency PWM control with voltage feed-forward for transient response stability - deployed in engine control units, body electronics, and ADAS power rails.

For engineers reviewing the A5970ADTR datasheet, A5970ADTR pinout, A5970ADTR application, or A5970ADTR equivalent, key selection criteria include its automotive-grade thermal shutdown (150 °C ± 10 °C), INH-controlled zero-current standby (<100 µA), synchronization capability for multi-rail noise reduction, and feedback disconnection protection - all validated under PPAP-compliant production flow.

Technical Context

The A5970ADTR implements a voltage-mode PWM architecture with an internal transconductance error amplifier (g_m = 2.3 mS, DC gain = 57 dB) referenced to a precision 3.3 V bandgap (±2% over temperature). Its oscillator generates a 500 kHz sawtooth waveform with voltage feed-forward modulation to maintain duty-cycle accuracy across wide input variations.

Current protection combines pulse-by-pulse limiting (min. 1.35 A at T_J = 85 °C) and frequency foldback during overload, while the inhibit function disables switching via active-high INH signal, reducing quiescent current to ≤100 µA. Thermal shutdown activates at 150 °C ± 10 °C with ~20 °C hysteresis to prevent cycling.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4 V to 36 V - enables operation during automotive cold-crank (≥4 V) and load-dump transients (≤36 V).
Output Current	Up to 1 A DC - limited by internal 1.35 A min. current limit and thermal design margin.
Switching Frequency	500 kHz (±15%) - fixed internal oscillator enables compact LC filter sizing and EMI predictability.
R_DS(on)	250 mΩ (typ.) - low on-resistance P-channel DMOS reduces conduction loss and heat generation.
Reference Voltage	3.3 V (±2%) - stable internal VREF for biasing and external circuitry; 1.235 V FB threshold sets output regulation point.
Quiescent Current	5 mA (operating), 100 µA (standby) - supports always-on vehicle modules with ultra-low sleep power.
Thermal Shutdown	150 °C ± 10 °C - protects silicon during sustained overload or poor heatsinking in under-hood environments.

Pinout & Package

Package: SO-8 (Small Outline, 8-pin, surface-mount, standard JEDEC MS-012AC footprint with exposed thermal pad).

Pin/Terminal	Circuit Role	Design Meaning
1 OUT	Regulator output node	Switched high-side output connected to inductor; carries peak-to-peak ripple current and must be routed with low-inductance path.
2 SYNCH	Synchronization I/O	Configurable master/slave pin; accepts 0.74–2.5×VREF sync signal or outputs 2.75–3 V clock pulse for multi-regulator phase alignment.
3 INH	Inhibit control input	Active-high enable/disable; >2.2 V disables device (I_Q ≤100 µA); <0.8 V enables; floating defaults to disable via internal pull-up.
4 COMP	Error amplifier output	Transconductance amplifier output for external compensation network (type II/III); sets loop stability and transient response.
5 FB	Feedback input	High-impedance input referenced to 1.235 V; connects to resistor divider for output voltage setting; open-circuit triggers shutdown.
6 VREF	Internal 3.3 V reference output	Stable, low-noise 3.3 V supply for external circuitry; no capacitor required, but ≥100 nF recommended for sync operation.
7 GND	Analog/digital ground	Common return for feedback, compensation, and reference; must be tied to power ground with minimal impedance.
8 VCC	Unregulated input supply	Main power input (4–36 V); powers internal regulator and gate driver; requires local ceramic decoupling (≥1 µF).

Key Features

Feature	Design Value
Voltage feed-forward	Compensates for input line variation in real time, maintaining consistent duty cycle and improving load-transient response without loop compensation changes.
Zero-load burst mode	Operates without bootstrap capacitor; sustains regulation at no load via randomized burst switching - eliminates minimum load requirement.
Feedback disconnection protection	Automatically disables switching if FB pin floats, preventing uncontrolled output voltage rise that could damage downstream circuitry.
Output overvoltage protection (OVP)	Triggers shutdown when FB voltage exceeds 1.3×V_FB (≈1.6 V), corresponding to ~30% overvoltage at regulated output with standard divider.
Thermal shutdown with hysteresis	Shuts down at 150 °C ±10 °C and restarts only after junction cools to ~130 °C, preventing oscillatory behavior in thermally marginal layouts.

Applications

Engine Control Unit (ECU) Power Supply

Automotive Body Control Module (BCM)

Use Scenario: Powers microcontroller, CAN transceivers, and sensor interfaces in gasoline/diesel engine ECUs exposed to -40 °C to +150 °C under-hood conditions.

IC Role / Device Role / Timing Role: Primary 5 V or 3.3 V buck regulator delivering stable rail under cold-crank (4.5 V battery) and load-dump (36 V surge) stress.

Use Value: AEC-Q100 qualification, 150 °C thermal shutdown, and 500 kHz switching ensure reliable operation and predictable EMI filtering in safety-critical engine management systems.

Use Scenario: Supplies power to door module MCUs, window lift drivers, and LED lighting controllers in centralized body electronics architectures.

IC Role / Device Role / Timing Role: Secondary buck converter generating 5 V/3.3 V from 12 V battery; synchronized with other regulators to suppress beat-frequency noise in shared PCBs.

Use Value: INH-controlled standby (<100 µA) enables always-on wake-up capability; adjustable output supports multiple subsystem voltage requirements from single BOM variant.

Advanced Driver Assistance Systems (ADAS) Camera Power

Infotainment System Core Rail

Use Scenario: Powers image signal processor (ISP) and CMOS image sensor in rear-view or surround-view cameras mounted near exhaust or brake systems.

IC Role / Device Role / Timing Role: High-efficiency, low-noise buck regulator operating up to 125 °C junction temperature; feeds LDOs for analog sensor bias and digital core supplies.

Use Value: 250 mΩ R_DS(on) minimizes self-heating; voltage feed-forward ensures stable output during rapid battery voltage dips during start-stop cycles.

Use Scenario: Generates 1.1 V or 1.2 V core voltage for application processors and memory in head-unit infotainment systems with extended temperature range requirements.

IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting dynamic voltage scaling (DVS); FB pin enables precise feedback for tight output tolerance (±1%).

Use Value: 1.235 V FB reference and external resistor divider allow accurate core rail tuning; zero-load burst mode maintains regulation during processor sleep states.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2678SD-5.0/NOPB	Fixed 5 V output; no adjustable FB; 600 kHz switching; not AEC-Q100 qualified.	Limited to non-automotive industrial or consumer use; lacks cold-crank support and automotive reliability testing.	Select only for cost-sensitive non-automotive designs where fixed 5 V output suffices and PPAP is not required.
MPQ4420AGL-AEC1-Z	AEC-Q100 Grade 1; 2 A output; 2.5–36 V input; 500 kHz; integrated soft-start; no VREF pin.	Higher current capability and enhanced protection (soft-start, OVP, UVLO), but lacks dedicated 3.3 V reference output for external biasing.	Prefer when >1 A load current or soft-start sequencing is needed; avoid when external circuitry relies on VREF pin functionality.

Compared with LM2678SD-5.0/NOPB, A5970ADTR offers automotive qualification and adjustable output; versus MPQ4420AGL-AEC1-Z, it provides a dedicated 3.3 V reference for system-level biasing but lower current rating - making it optimal for space-constrained, reference-dependent automotive sub-systems.

Availability

A5970ADTR is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and infotainment core rails requiring stable component supply across automotive production lifecycles.

Supply support for A5970ADTR 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 ICs, sensors, and automotive-grade analog devices.

The A5970ADTR belongs to ST's automotive power management portfolio, engineered specifically for robust, high-reliability DC-DC conversion in harsh under-hood and chassis-mounted environments.

FAQ

What is the minimum input voltage required for A5970ADTR to start switching?

The A5970ADTR begins regulation at 4 V input, enabling operation during automotive cold-crank events where battery voltage drops below 6 V. Startup occurs once V_CC exceeds the undervoltage lockout (UVLO) threshold with hysteresis, and the INH pin is asserted low. Below 4 V, the device remains disabled regardless of INH state.

Can A5970ADTR synchronize with an external clock source?

Yes - the SYNCH pin supports external synchronization: apply a square wave with amplitude between 0.74 V and 2.5×V_REF (i.e., 0.74–8.25 V) and frequency ≥575 kHz. The device locks to the external signal within one cycle; duty cycle must remain between 10% and 90% for reliable detection.

How does feedback disconnection protection work on A5970ADTR?

When the FB pin is left floating or disconnected, internal circuitry detects absence of valid voltage divider bias and forces the device into shutdown mode within microseconds. This prevents uncontrolled 100% duty-cycle operation that would drive the output toward V_IN, protecting downstream loads from overvoltage damage.

Is an external bootstrap capacitor required for A5970ADTR operation?

No - the A5970ADTR uses an internal P-channel MOSFET high-side switch, eliminating the need for a bootstrap capacitor. This enables true zero-load operation in burst mode and simplifies layout in space-constrained automotive modules where board area is at a premium.

A5970ADTR 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:: 500kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

A5970ADTR FAQ

1.How can I place an order for A5970ADTR through Aetrix?

Please submit a Request for Quotation (RFQ) for A5970ADTR 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 A5970ADTR reliable?

The price and inventory of A5970ADTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5970ADTR is usually 5 days.

3.What payment methods are accepted for A5970ADTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5970ADTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A5970ADTR?

A5970ADTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A5970ADTR 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 A5970ADTR?

For technical support, including A5970ADTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5970ADTR requirements.

6.How does Aetrix verify that A5970ADTR is sourced from the original manufacturer or authorized distributors?

All A5970ADTR 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 A5970ADTR meets industry standards.

7.What is the process for return or replacement of A5970ADTR?

All A5970ADTR units undergo pre-shipment inspection (PSI). If there is an issue with A5970ADTR, 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 A5970ADTR part is unused and in its original packaging.

Return procedure for A5970ADTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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