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

STMicroelectronics A6986ITR

Name: A6986ITR
Brand: STMicroelectronics
SKU: A6986ITR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A6986ITR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: A6986ITR.pdf

Description:: IC REG BUCK ADJ 16HTSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

A6986ITR from STMicroelectronics is an AEC-Q100 Grade 1 qualified synchronous iso-buck DC-DC controller IC designed for automotive isolated gate drive supplies. It operates from 4 V to 38 V input, delivers primary output voltage regulation without optocoupler, features 1.9 A typical sink peak primary current, 300 ns current-sense blanking time, and embedded primary output voltage supervisor with RST open-collector fault signaling - enabling robust isolated power in OBC and traction inverters.

For engineers reviewing the A6986ITR datasheet, A6986ITR pinout, A6986ITR application, or A6986ITR equivalent, this device supports forced PWM operation in iso-buck topology with adjustable soft-start, synchronization capability, thermal shutdown, overvoltage protection, and programmable switching frequency - critical for cold-crank tolerant, high-reliability automotive power conversion design.

Technical Context

The A6986ITR implements a peak current mode control architecture with 100% duty cycle capability, enabling stable regulation during automotive load dump (up to 38 V) and cold crank (down to 4 V). Its internal high-side P-MOSFET (R_DS(on) = 180 mΩ) and low-side N-MOSFET (R_DS(on) = 150 mΩ) support synchronous rectification and reverse current conduction for tracked secondary soft-start.

It integrates pulse-by-pulse primary current limiting, valley current sensing, and a 300 ns blanking window to suppress transformer leakage-induced oscillations. The switchover regulator allows VBIAS (3–5.5 V) to supply internal circuitry, reducing VIN quiescent current to 0.5–1.5 mA under normal operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4 V to 38 V - meets automotive cold-crank (4 V) and load-dump (38 V) requirements without external pre-regulation.
Peak Primary Sink Current	1.9 A typ. - enables sufficient energy transfer to secondary side during soft-start and short-circuit recovery.
Switching Frequency	225–1100 kHz (pin-strapped) - supports EMI optimization and compact magnetics design across OBC and traction systems.
R_DS(on) HS / LS	180 mΩ / 150 mΩ - reduces conduction losses and thermal stress in high-duty-cycle automotive operation.
Quiescent Current (VIN)	0.5–1.5 mA (typ.) - achieved via VBIAS switchover, critical for always-on vehicle subsystems.
Blanking Time	300 ns - filters transformer leakage ringing at LX node, ensuring stable current sensing and loop stability.
Thermal Shutdown	165 °C (typ.) with 30 °C hysteresis - protects silicon during overload or poor heatsinking in enclosed EV modules.

Pinout & Package

Package: HTSSOP16 (exposed pad), R_thJA = 40 °C/W (on ST demo board), rated for -40 °C to +150 °C junction temperature.

Pin/Terminal	Circuit Role	Design Meaning
RST	Open-collector reset output	Asserts low when primary output voltage deviates >±2% from 0.85 V reference; delay timing set by external capacitor on DELAY pin.
VCC	Internal analog supply rail	Supplies embedded error amplifier, oscillator, and logic; requires ≥470 nF ceramic bypass capacitor to ground.
SS/INH	Soft-start ramp & inhibit control	Internal 1 µA/4 µA current source charges external capacitor for controlled startup; pulled low disables operation.
SYNCH	Master/slave clock synchronization input	Accepts external clock (275–1000 kHz) or floats for free-running; supports up to 6 slave devices in parallel.
FSW	Switching frequency selection	Resistor strapping (E24 series) between FSW–VCC or FSW–GND sets f_SW before soft-start begins.
COMP	Error amplifier output	Connects to external compensation network (type II/III) to stabilize primary voltage regulation loop.
FB	Primary output voltage feedback	Senses regulated primary output via resistive divider; internal reference = 0.85 V ±1.05%.
LX	Power switch node	Connects to transformer primary winding center-tap; dual pins (13 & 14) reduce parasitic inductance.
PGND / SGND	Power & signal ground returns	Separate PGND (pins 11,12) and SGND (pin 10) minimize noise coupling into sensitive analog blocks.
VIN	Main DC input supply	Accepts 4–38 V unregulated automotive battery rail; internal UVLO thresholds: 2.7 V (rising), 2.4 V (falling).
VBIAS	Secondary supply switchover input	When connected to regulated primary output (3–5.5 V), reduces VIN quiescent current by powering internal LDO.
MLF	RST threshold adjustment	Pull-down resistor selects RST trip point (80–96% of VOUT) per Table 7; required for precise fault detection.
DELAY	RST assertion delay timing	External capacitor sets delay (µs to ms) before RST releases after primary output recovers regulation.
Exposed Pad	Thermal & electrical ground	Must be soldered to combined SGND+PGND copper pour for thermal dissipation and noise immunity.

Key Features

Feature	Design Value
100% duty cycle operation	Enables uninterrupted regulation during automotive cold-crank events down to 4 V input without dropout.
Forced PWM with reverse current capability	Allows negative inductor current during off-time, enabling tracked soft-start and improved transient response on secondary side.
Embedded primary output voltage supervisor	Provides system-level fault signaling via RST pin with user-adjustable trip threshold and release delay.
Transformer leakage ringing immunity	300 ns blanking window + optional RC snubber ensures reliable current sensing despite high dv/dt at LX node.
VBIAS switchover regulator	Reduces total VIN supply current by >50% when primary output powers internal circuitry - extends battery life in standby.

Applications

Automotive IGBT Gate Drive Supply

OBC Auxiliary Isolated Bias Rail

Use Scenario: Providing isolated ±15 V bias to IGBT gate drivers in high-voltage traction inverters.

IC Role / Device Role / Timing Role: Primary-side controller regulating isolated 12 V or 15 V rail using custom transformer; no optocoupler needed.

Use Value: Eliminates optocoupler aging and CMTI limitations while maintaining AEC-Q100 Grade 1 reliability across -40 °C to +150 °C.

Use Scenario: Generating isolated 5 V/3.3 V auxiliary supply for OBC microcontrollers and SiC gate drivers.

IC Role / Device Role / Timing Role: Synchronous iso-buck controller delivering stable output despite wide VIN swing (6–42 V) during charging cycles.

Use Value: Achieves <±1% line regulation over full input range and supports fast load transients required for digital control loops.

Traction Inverter Auxiliary Power

HEV/EV Battery Management System Isolation

Use Scenario: Powering isolated CAN transceivers and current sense amplifiers in high-noise motor control environments.

IC Role / Device Role / Timing Role: Regulating isolated 3.3 V rail referenced to high-side floating domain; synchronized to main inverter clock.

Use Value: 300 ns blanking and separate PGND/SGND paths suppress common-mode noise coupling into analog measurement circuits.

Use Scenario: Supplying isolated power to cell monitoring ICs across 96-cell battery stacks (up to 400 V potential difference).

IC Role / Device Role / Timing Role: Primary-side controller driving transformer with reinforced isolation; RST signals overvoltage on primary rail.

Use Value: Embedded OVP discharges primary capacitor during fault, preventing cascading failure in multi-module BMS architectures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar iso-buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM5180QDGQRQ1	Uses flyback topology; requires optocoupler for regulation; higher IQ (15 µA shutdown) but no VBIAS switchover.	Better suited for lower-power (<2 W), cost-sensitive isolated rails where transformer design flexibility outweighs regulation accuracy.	Select if transformer reuse from legacy flyback designs is prioritized over primary-side regulation precision.
UCC28911DR	Primary-side regulated flyback controller with integrated 700 V MOSFET; no secondary sensing; fixed 500 kHz fSW.	Targets ultra-low-power auxiliary supplies (<1 W); lacks programmable soft-start, sync, or RST supervision.	Choose only for non-AEC-Q100, low-complexity applications where BOM count reduction is critical and isolation voltage ≤500 V.

Compared with LM5180QDGQRQ1 and UCC28911DR, the A6986ITR uniquely combines AEC-Q100 Grade 1 qualification, optocoupler-free primary regulation, VBIAS switchover for ultra-low IQ, and RST-based fault signaling - making it the only option qualified for safety-critical isolated gate drive and OBC auxiliary rails in HEV/EV platforms.

Availability

A6986ITR is available at Aetrix Electronics and suitable for automotive traction inverters, on-board chargers, and battery management systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for A6986ITR 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, specializing in automotive-grade power management, microcontrollers, and analog ICs.

The A6986I product line targets high-reliability isolated DC-DC conversion in electric vehicle powertrain systems, with emphasis on cold-crank resilience, functional safety readiness, and integration of supervision features for ASIL-B compatible designs.

FAQ

What is the purpose of the MLF pin on the A6986ITR?

The MLF pin adjusts the RST open-collector output's voltage trip threshold by connecting an external resistor to ground. Per Table 7, resistor values (e.g., 8.2 kΩ, 18 kΩ) select RST activation at 80%, 87%, or 96% of the primary output voltage - enabling precise fault detection aligned with downstream gate driver UVLO thresholds.

Can the A6986ITR operate without an external transformer?

No. The A6986ITR is strictly an iso-buck controller and requires an externally designed two-winding transformer to establish galvanic isolation and define the secondary output voltage ratio. It does not integrate magnetics and cannot function in non-isolated buck configurations - attempting such use violates its operational architecture and voids AEC-Q100 compliance.

How does the VBIAS switchover feature reduce system power consumption?

When VBIAS (3–5.5 V) is connected to the regulated primary output, the internal LDO switches its supply source from VIN to VBIAS. This reduces VIN quiescent current from ~2.8 mA (VBIAS = GND) to ~0.5–1.5 mA (VBIAS = 3.3 V), cutting standby power by >50% - critical for always-on vehicle networks where cumulative current draw impacts battery drain over weeks of parking.

Is the A6986ITR pin-compatible with other ST iso-buck controllers like A6986 or A6986F?

No. The A6986ITR uses HTSSOP16 packaging with dedicated pins for RST, DELAY, MLF, and SYNCH - none of which appear on the A6986 (HTSSOP16 but no RST/DELAY), A6986F (HTSSOP20), or A6985F (HTSSOP16 with different pinout). PCB layout, compensation network, and transformer interface must be redesigned for each variant due to architectural and functional differences.

A6986ITR 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:: -

Frequency - Switching:: 275kHz ~ 2.2MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 135°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 16-HTSSOP

A6986ITR FAQ

1.How can I place an order for A6986ITR through Aetrix?

Please submit a Request for Quotation (RFQ) for A6986ITR 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 A6986ITR reliable?

The price and inventory of A6986ITR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6986ITR is usually 5 days.

3.What payment methods are accepted for A6986ITR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6986ITR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A6986ITR?

A6986ITR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A6986ITR 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 A6986ITR?

For technical support, including A6986ITR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6986ITR requirements.

6.How does Aetrix verify that A6986ITR is sourced from the original manufacturer or authorized distributors?

All A6986ITR 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 A6986ITR meets industry standards.

7.What is the process for return or replacement of A6986ITR?

All A6986ITR units undergo pre-shipment inspection (PSI). If there is an issue with A6986ITR, 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 A6986ITR part is unused and in its original packaging.

Return procedure for A6986ITR:

1.Submit a request within 90 days.

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

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