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

STMicroelectronics A6986TR

Name: A6986TR
Brand: STMicroelectronics
SKU: A6986TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A6986TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerTSSOP (0.173", 4.40mm Width)

Datasheet:: A6986TR.pdf

Description:: IC REG BUCK ADJ 2A 16HTSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

A6986TR from STMicroelectronics is a 38 V, 2 A synchronous step-down switching regulator with peak-current-mode control, 30 µA quiescent current in Low Consumption Mode (LCM), AEC-Q100 qualified for automotive use, and adjustable output voltage from 0.85 V to VIN - deployed in car body control modules and parking-mode battery systems.

For engineers reviewing the A6986TR datasheet, A6986TR pinout, A6986TR application, or A6986TR equivalent, key selection criteria include cold-crank 100% duty-cycle capability, dual LCM/LNM operating modes, embedded RST supervisor with adjustable delay, synchronization support, and HTSSOP16 thermal performance (R_thJA = 40 °C/W).

Technical Context

The A6986TR implements peak-current-mode architecture with pulse-by-pulse high-side/low-side current sensing for overcurrent protection and foldback under short-circuit. Its switchover feature dynamically shifts internal bias supply from VIN to VBIAS (3–5.5 V) to reduce input quiescent current.

It supports two distinct light-load strategies: LCM enables discontinuous conduction with controlled ripple for ultra-low IQ (30 µA at 3.3 V out), while LNM enforces fixed-frequency PWM with minimized output ripple for car audio compliance. RST open-collector output provides reset supervision with user-adjustable threshold and delay via external capacitor.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4 V to 38 V - supports automotive battery transients including cold crank (100% duty cycle)
Output Current	2 A DC - sustained continuous load capability with internal current limiting
Quiescent Current (LCM)	30 µA at light load (V_OUT = 3.3 V) - enables >1-year battery standby in parking-mode systems
Switching Frequency	250 kHz to 2 MHz - adjustable via FSW pinstrapping; supports EMI optimization and compact magnetics
Output Voltage Range	0.85 V to V_IN - wide adjustability for MCU/FPGA core and I/O rail generation
R_DS(on) HS / LS	180 mΩ / 150 mΩ - low conduction loss enabling >90% efficiency at medium/heavy loads
Thermal Shutdown	165 °C with 30 °C hysteresis - protects against sustained overload or poor PCB heatsinking
AEC-Q100 Grade	Grade 1 (−40 °C to +125 °C ambient) - qualified for under-hood automotive applications

Pinout & Package

Package: HTSSOP16 (exposed pad), R_thJA = 40 °C/W, R_thJC = 5 °C/W. Exposed pad must be connected to SGND and PGND for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
1 RST	Open-collector reset output	Asserts low when V_OUT falls below programmable threshold; delay set by external C on Pin 8
2 VCC	Analog supply rail	Powers internal reference and error amplifier; requires ≥470 nF ceramic decoupling
3 SS/INH	Soft-start / inhibit control	Internal 4 µA current source charges external C for ramped startup; pulled low to disable
4 SYNCH	Synchronization input	Accepts external clock (266.5 kHz–2 MHz) for noise-sensitive multi-regulator systems
5 FSW	Frequency selection	Resistor-divider to VCC/GND sets f_SW before soft-start; no dynamic reconfiguration
6 MLF	Mode & RST threshold select	Configures LCM vs LNM and selects RST trip point (80–96% of V_OUT)
7 COMP	Error amplifier output	Connects external compensation network (type II/III) for loop stability
8 DELAY	RST assertion timing	External capacitor sets delay from V_OUT recovery to RST release (typ. 1.23 V threshold)
9 FB	Voltage feedback input	Inverting input of transconductance error amp; references 0.85 V internal bandgap
10 SGND	Signal ground	Reference for analog circuitry; separate from power ground to minimize noise coupling
11 PGND	Power ground	High-current return path for LX switches; tied to exposed pad for thermal conduction
13–14 LX	Switching node	Drives external inductor; dual pins reduce parasitic inductance and improve EMI
15 VIN	Main input supply	Accepts 4–38 V; includes UVLO (2.7 V rise / 2.5 V fall) for reliable start-up
16 VBIAS	Bias supply switchover	Connect to regulated output to reduce input IQ; switchover threshold ~3.05 V

Key Features

Feature	Design Value
Peak-current-mode control	Enables fast transient response and inherent cycle-by-cycle overcurrent protection
Dual operating modes (LCM/LNM)	LCM maximizes light-load efficiency; LNM guarantees constant frequency and low ripple for audio
Embedded output voltage supervisor	RST open-collector output with user-programmable threshold and delay for µC/FPGA reset sequencing
Synchronous rectification	Integrated HS/LS MOSFETs eliminate external diode losses, improving efficiency at medium–heavy loads
Cold-crank 100% duty cycle	Maintains regulation during automotive battery drop to 3 V, critical for body electronics survival
Switchover bias architecture	Reduces effective input IQ by sourcing internal bias from V_OUT instead of VIN when V_BIAS ≥ 3 V

Applications

Car Body Control Module (CBCM)

Automotive Parking Mode System

Use Scenario: Centralized power management for door locks, lighting, and window controls in modern vehicle architectures.

IC Role / Device Role / Timing Role: Primary 5 V/3.3 V buck regulator supplying microcontrollers and CAN transceivers with cold-crank resilience.

Use Value: 100% duty cycle operation ensures uninterrupted function during engine start; 30 µA LCM IQ extends battery life during weeks-long parking.

Use Scenario: Always-on subsystems monitoring intrusion, tire pressure, or remote wake-up signals while vehicle is parked.

IC Role / Device Role / Timing Role: Standby power regulator delivering stable 3.3 V to ultra-low-power MCUs and RF receivers.

Use Value: 30 µA quiescent current enables >1 year of operation on 12 V lead-acid battery without recharge.

Automotive Infotainment Audio Supply

ADAS Camera Power Sequencing

Use Scenario: Clean, low-noise power for DSPs, ADCs, and Class-D amplifiers in head-unit audio subsystems.

IC Role / Device Role / Timing Role: Secondary buck regulator operating in Low Noise Mode (LNM) to suppress switching artifacts in analog signal paths.

Use Value: Fixed-frequency PWM and minimized output ripple meet CISPR-25 Class 5 EMI requirements for audio fidelity.

Use Scenario: Multi-rail power delivery for image sensors, ISPs, and SerDes interfaces requiring strict power-up order.

IC Role / Device Role / Timing Role: Regulator with RST output and adjustable delay enabling precise voltage sequencing across 1.2 V core, 1.8 V I/O, and 2.8 V sensor rails.

Use Value: Programmable RST threshold and external DELAY capacitor allow deterministic reset assertion timing across all rails.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM61480QPWRQ1	Higher 4 A output, 3.5–36 V input, 15 µA IQ, but no RST supervisor or LCM/LNM mode selection	Lacks integrated reset supervision and dual-mode light-load optimization - requires external sequencer and PMIC coordination	Preferred when higher current and lower IQ are prioritized over autonomous reset and automotive sleep-mode features
TPS62933RGER	3 A output, 3–36 V input, 12 µA IQ, supports PFM/PWM auto-transition, but not AEC-Q100 qualified	Not automotive-qualified; lacks cold-crank 100% duty cycle and embedded OVP - unsuitable for under-hood deployment	Applicable only in industrial or consumer battery-powered systems where qualification and transient robustness are non-critical

Compared with LM61480QPWRQ1 and TPS62933RGER, the A6986TR uniquely combines AEC-Q100 qualification, cold-crank resilience, dual LCM/LNM operation, and integrated RST sequencing - making it the sole choice for cost-sensitive, space-constrained automotive body and infotainment power rails requiring full autonomy.

Availability

A6986TR is available at Aetrix Electronics and suitable for automotive body electronics, parking-mode battery systems, infotainment audio supplies, and ADAS camera power sequencing requiring stable component supply across extended temperature and lifecycle demands.

Supply support for A6986TR 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 A6986TR belongs to ST's automotive-qualified power management portfolio, engineered specifically for robust, low-IQ DC-DC conversion in harsh vehicle environments - emphasizing cold-crank survival, EMI resilience, and functional safety readiness.

FAQ

What is the purpose of the VBIAS pin on the A6986TR?

The VBIAS pin enables switchover operation: when connected to a regulated output voltage between 3 V and 5.5 V, the internal LDO shifts its bias supply from VIN to VBIAS. This reduces effective input quiescent current - for example, dropping IQ from 70 µA to 30 µA in LCM mode - extending battery life in always-on automotive systems.

How does the A6986TR handle cold-crank conditions?

The A6986TR supports 100% duty cycle operation down to VIN = 3 V, maintaining regulated output during automotive cold-crank events where battery voltage collapses to ~3–6 V. This is enabled by its P-channel high-side MOSFET architecture and UVLO thresholds (2.5 V fall, 2.7 V rise) that prevent premature shutdown during transient dips.

Can the A6986TR synchronize to an external clock?

Yes - the SYNCH pin accepts an external clock signal (266.5 kHz to 2 MHz) to synchronize switching frequency across multiple regulators. In Low Noise Mode (LNM), synchronization is mandatory for EMI reduction; in Low Consumption Mode (LCM), SYNCH is disabled and the device operates at its configured f_SW.

What design considerations apply to the RST output functionality?

The RST pin is an open-collector output asserting low when V_OUT falls below a threshold set by MLF pinstrapping (80–96% of V_OUT). An external capacitor on DELAY pin determines the time from V_OUT recovery to RST release - enabling precise reset hold-off for digital loads like MCUs and FPGAs during power-up sequencing.

A6986TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-PowerTSSOP (0.173", 4.40mm 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):: 38V

Voltage - Output (Min/Fixed):: 0.85V

Voltage - Output (Max):: 38V

Current - Output:: 2A

Frequency - Switching:: 225kHz ~ 2.2MHz

Synchronous Rectifier:: Yes

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 16-HTSSOP

A6986TR FAQ

1.How can I place an order for A6986TR through Aetrix?

Please submit a Request for Quotation (RFQ) for A6986TR 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 A6986TR reliable?

The price and inventory of A6986TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6986TR is usually 5 days.

3.What payment methods are accepted for A6986TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6986TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A6986TR?

A6986TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A6986TR 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 A6986TR?

For technical support, including A6986TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6986TR requirements.

6.How does Aetrix verify that A6986TR is sourced from the original manufacturer or authorized distributors?

All A6986TR 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 A6986TR meets industry standards.

7.What is the process for return or replacement of A6986TR?

All A6986TR units undergo pre-shipment inspection (PSI). If there is an issue with A6986TR, 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 A6986TR part is unused and in its original packaging.

Return procedure for A6986TR:

1.Submit a request within 90 days.

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

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