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

STMicroelectronics A6986F5V

Name: A6986F5V
Brand: STMicroelectronics
SKU: A6986F5V
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A6986F5V

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: A6986F5V.pdf

Description:: IC REG BUCK 5V 1.5A 16HTSSOP

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Product details

Overview

A6986F5V from STMicroelectronics is an AEC-Q100 qualified automotive synchronous step-down switching regulator delivering 1.5 A DC output at fixed 5 V, operating from 4 V to 38 V input, with 30 µA quiescent current in Low Consumption Mode (LCM), peak current mode control, and integrated output voltage supervisor for microcontroller reset sequencing - deployed in car body control modules and parking-mode battery systems.

For engineers reviewing the A6986F5V datasheet, A6986F5V pinout, A6986F5V application, or A6986F5V equivalent, this page delivers verified technical context, HTSSOP16 package mapping, LCM/LNM mode selection logic, RST supervisor timing behavior, and real-world automotive power design trade-offs between light-load efficiency and low-noise operation.

Technical Context

The A6986F5V implements peak current mode control with pulse-by-pulse high-side/low-side current sensing, enabling precise constant-current protection and foldback under short-circuit. Its embedded P-channel high-side switch (R_DS(on) = 180 mΩ) supports 100% duty cycle for cold-crank operation down to 4 V input.

Two configurable operating modes are hardware-selected via MLF pinstrapping: Low Consumption Mode (LCM) optimizes light-load efficiency with variable-frequency discontinuous conduction, while Low Noise Mode (LNM) enforces fixed-frequency PWM (250 kHz–2 MHz) with synchronized operation and minimized output ripple - critical for car audio subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 5.0 V ±1.5% (A6986F5V variant); enables direct powering of 5 V MCU peripherals without external feedback divider.
Input Voltage Range	4 V to 38 V; sustains automotive cold-crank (4.5 V min) and load-dump (38 V max) transients without external protection.
Quiescent Current (LCM)	30 µA at light load (V_OUT = 5 V); extends battery life in always-on vehicle modules during parking mode.
Shutdown Current	8 µA typical; minimizes parasitic drain when system is fully inhibited via SS/INH pin.
Switching Frequency	250 kHz to 2 MHz, pin-selectable via FSW resistor; allows EMI tuning and inductor size optimization for space-constrained ECUs.
R_DS(on) HS / LS	180 mΩ / 150 mΩ at I_SW = 1 A; reduces conduction loss and thermal stress at 1.5 A continuous output.
Thermal Shutdown	165 °C with 30 °C hysteresis; protects silicon during sustained overload or poor PCB heatsinking in under-hood environments.

Pinout & Package

Package: HTSSOP16 (exposed pad), R_thJA = 40 °C/W on ST reference board; exposed pad must be connected to SGND/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 (e.g., 93% of 5 V = 4.65 V); supports µC reset sequencing with adjustable delay via external capacitor.
3 SS/INH	Soft-start / inhibit control	Pulled low to disable regulator; internal 4 µA current source charges external capacitor to control ramp time and limit inrush current.
4 SYNCH/ISKP	Mode-select / sync input	In LNM: accepts external clock for master/slave synchronization; in LCM: selects skip current level (0.2–0.6 A) to optimize light-load efficiency.
5 FSW	Frequency select	Resistor divider to V_CC or GND sets f_SW before soft-start; avoids dynamic frequency shifts during startup.
6 MLF	Mode & RST threshold select	Configures LCM vs. LNM and sets RST trip point (e.g., 80%, 87%, 93%, or 96% of V_OUT) via resistor strapping.
7 COMP	Error amplifier output	Connects external RC compensation network to stabilize loop response across line/load/temperature variations.
8 DELAY	RST assertion delay	External capacitor sets delay (≈1 µA × C) before RST releases after V_OUT recovers; enables glitch immunity.
9 VOUT	Feedback sense	Internal 5 V reference divider (G_{DIV_INT}) eliminates need for external resistors in fixed-output variants.
13–14 LX	Power switch node	Drives external inductor; dual pins reduce trace inductance and improve EMI performance in high-di/dt switching.
15 VIN	Main power input	Accepts raw battery rail (4–38 V); internal UVLO (2.7 V rising) prevents erratic startup during brownout.
16 VBIAS	Efficiency-boost bias supply	Connect to regulated 3.3 V or 5 V rail to reduce quiescent current by ~60% in LCM via switchover circuitry.

Key Features

Feature	Design Value
Embedded output voltage supervisor	Programmable RST threshold (80–96% of V_OUT) with adjustable delay ensures reliable µC/FPGA reset during power-up/down transitions.
Low Noise Mode (LNM)	Fixed-frequency PWM with synchronization capability meets CISPR-25 Class 5 EMI requirements for car audio amplifiers and infotainment displays.
Low Consumption Mode (LCM)	Variable-frequency operation reduces switching losses at light loads, achieving 30 µA I_Q while maintaining <1% output ripple.
100% duty cycle support	Enables regulation down to 4 V input - critical for engine start-stop systems where battery voltage dips below 6 V.
Integrated current limiting	Pulse-by-pulse sensing on both HS/LS switches provides fast overcurrent response (<100 ns) and foldback protection during sustained shorts.

Applications

Body Control Module (BCM)

Infotainment Power Supply

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 buck regulator supplying CAN transceivers, LIN gateways, and microcontrollers during ignition-off parking mode.

Use Value: 30 µA quiescent current extends battery life beyond 30 days in key-off state while maintaining full reset supervision via RST pin.

Use Scenario: Clean, low-noise 5 V rail for DSPs, touch controllers, and display drivers in head-unit designs.

IC Role / Device Role / Timing Role: Fixed-frequency LNM operation synchronized to system clock minimizes beat frequencies with audio DAC sampling clocks.

Use Value: 2 MHz switching + integrated EMI filtering reduces conducted emissions by >15 dBµV compared to non-synchronized 500 kHz alternatives.

ADAS Camera ECU

Parking Assistance Sensor Hub

Use Scenario: Powering image signal processors and MIPI interfaces in rear-view and surround-view camera modules.

IC Role / Device Role / Timing Role: Delivers stable 5 V under wide input transients (cold crank, load dump) with thermal shutdown protecting silicon in sealed enclosures.

Use Value: 180 mΩ/150 mΩ R_DS(on) limits temperature rise to <45 °C at 1.5 A ambient 85 °C, eliminating need for forced air cooling.

Use Scenario: Consolidated power for ultrasonic parking sensors, radar preprocessing units, and CAN bus nodes.

IC Role / Device Role / Timing Role: Output voltage sequencing via RST pin ensures orderly power-up of sensor analog front-ends before digital controllers initialize.

Use Value: Adjustable DELAY capacitor (10–100 nF) configures 10–100 ms reset hold time, matching sensor warm-up latency specifications.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS62130ARGTR	Non-automotive grade (no AEC-Q100), 3–17 V input, 3.6 µA I_Q, no RST supervisor or LNM mode	Suitable for industrial or consumer portable devices; lacks automotive transient robustness and reset sequencing	Select only for cost-sensitive non-automotive designs requiring ultra-low I_Q but no safety-critical supervision.
LM61480QRNXTQ1	AEC-Q100 Grade 1, 3–36 V input, 1.5 A, 15 µA I_Q, no pin-selectable LNM/LCM, requires external feedback	Offers higher efficiency at medium load but lacks hardware-configurable noise/efficiency trade-off and integrated V_OUT monitor	Prefer when fixed 5 V output is not required and design prioritizes thermal performance over mode flexibility.

Compared with TPS62130ARGTR and LM61480QRNXTQ1, the A6986F5V uniquely combines AEC-Q100 qualification, pin-strapped LNM/LCM selection, integrated RST supervisor with programmable delay, and fixed 5 V output - making it the only choice for automotive body electronics requiring guaranteed parking-mode runtime and deterministic power sequencing.

Availability

A6986F5V is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power supplies, ADAS camera ECUs, and parking assistance sensor hubs requiring stable component supply across extended temperature and automotive lifecycle demands.

Supply support for A6986F5V 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 specializing in automotive, industrial, and power management ICs, with manufacturing and quality systems certified to IATF 16949 and AEC-Q100 standards.

The A6986F belongs to ST's automotive-grade monolithic DC-DC converter product line, designed specifically for harsh-environment vehicle subsystems requiring high reliability, wide input range, and intelligent power supervision.

FAQ

What is the purpose of the VBIAS pin on the A6986F5V?

The VBIAS pin allows connection to an external regulated voltage (e.g., 3.3 V or 5 V) to power part of the internal analog circuitry, reducing total quiescent current by up to 60% in Low Consumption Mode. When unused, it must be tied to GND; floating is not allowed. Switchover occurs automatically when VBIAS exceeds 2.85 V (rising) or drops below 2.78 V (falling).

How does the RST pin function in automotive reset sequencing?

The RST pin is an open-collector output that goes low when V_OUT falls below a programmable threshold (e.g., 93% of 5 V = 4.65 V). An external capacitor on the DELAY pin sets the hold time before RST releases after recovery. This enables precise power-up sequencing for MCUs and FPGAs, ensuring peripherals are fully powered before logic initialization.

Can the A6986F5V operate during cold-crank conditions?

Yes. With a 4 V to 38 V input range and 100% duty-cycle capability, the A6986F5V maintains regulation during automotive cold-crank events where battery voltage drops to 4.5 V or lower. Its internal UVLO has a 2.7 V rising threshold and 2.4 V falling threshold, preventing erratic startup or dropout during transient dips.

What distinguishes Low Noise Mode (LNM) from Low Consumption Mode (LCM)?

LNM forces fixed-frequency PWM operation (250 kHz–2 MHz) with synchronization capability to minimize EMI and output ripple - ideal for car audio. LCM uses variable-frequency discontinuous conduction to reduce switching losses at light loads, achieving 30 µA I_Q. Mode selection is hardware-configured via the MLF pin and cannot be changed dynamically during operation.

A6986F5V Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 4V

Voltage - Input (Max):: 38V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Current - Output:: 1.5A

Frequency - Switching:: 250kHz ~ 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

A6986F5V FAQ

1.How can I place an order for A6986F5V through Aetrix?

Please submit a Request for Quotation (RFQ) for A6986F5V 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 A6986F5V reliable?

The price and inventory of A6986F5V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6986F5V is usually 5 days.

3.What payment methods are accepted for A6986F5V?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6986F5V transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A6986F5V?

A6986F5V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A6986F5V 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 A6986F5V?

For technical support, including A6986F5V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6986F5V requirements.

6.How does Aetrix verify that A6986F5V is sourced from the original manufacturer or authorized distributors?

All A6986F5V 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 A6986F5V meets industry standards.

7.What is the process for return or replacement of A6986F5V?

All A6986F5V units undergo pre-shipment inspection (PSI). If there is an issue with A6986F5V, 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 A6986F5V part is unused and in its original packaging.

Return procedure for A6986F5V:

1.Submit a request within 90 days.

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

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