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

STMicroelectronics A6985F5VTR

Name: A6985F5VTR
Brand: STMicroelectronics
SKU: A6985F5VTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A6985F5VTR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: A6985F5VTR.pdf

Description:: IC REG BUCK 5V 500MA 16HTSSOP

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Product details

Overview

A6985F5VTR from STMicroelectronics is an AEC-Q100 qualified automotive synchronous step-down switching regulator delivering 500 mA DC output current with fixed 5 V output, 4–38 V input range, 30 µA quiescent current in low-consumption mode, and peak current mode control architecture-designed for car body electronics and battery-powered parking-mode systems.

For engineers reviewing the A6985F5VTR datasheet, A6985F5VTR pinout, A6985F5VTR application, or A6985F5VTR equivalent, key selection criteria include LCM/LNM mode selection via MLF pin, adjustable soft-start timing, embedded output voltage supervisor (RST), synchronization capability, and thermal shutdown at 165 °C.

Technical Context

The A6985F5VTR implements peak current mode control with pulse-by-pulse high-side/low-side current sensing for constant-current protection and foldback under short-circuit. Its dual operating modes-Low Noise Mode (LNM) enforces constant-frequency PWM to minimize output ripple in car audio; Low Consumption Mode (LCM) enables burst-mode-like efficiency at light load with controlled ripple.

It integrates a transconductance error amplifier, internal voltage reference, programmable soft-start (via SS/INH), output voltage sequencing (via RST open-collector with DELAY capacitor), and switchover functionality between VIN and VBIAS supply paths to reduce IQ below 10 µA in sleep conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	0.5 A DC maximum-supports medium-power microcontrollers and sensors in automotive ECUs.
Input voltage range	4 V to 38 V-meets cold-crank (4.5 V) and load-dump (38 V) requirements per ISO 16750-2.
Quiescent current (LCM)	30 µA at light load with 3.3 V output-enables >1-year battery life in always-on parking-mode modules.
Switching frequency	250 kHz to 2 MHz-pin-selectable via FSW resistor; enables compact magnetics and EMI optimization.
R_DS(on) HS / LS	360 mΩ / 150 mΩ-reduces conduction loss and thermal stress at full load in HTSSOP16 package.
Output voltage supervisor	RST open-collector with adjustable delay-provides reset signaling and power-up sequencing for µC/FPGA loads.
Thermal shutdown	165 °C with 30 °C hysteresis-prevents permanent damage during sustained overload or poor PCB heatsinking.

Pinout & Package

Package: HTSSOP16 (exposed pad), R_thJA = 40 °C/W, RoHS-compliant, automotive-grade moisture sensitivity level MSL3.

Pin/Terminal	Circuit Role	Design Meaning
1 RST	Open-collector reset output	Asserts low when VOUT falls below threshold; delay set by external capacitor on DELAY pin.
2 VCC	Internal analog supply	Requires ≥470 nF ceramic decoupling; powers reference, error amp, and logic circuitry.
3 SS/INH	Soft-start / inhibit input	Pulled low disables regulator; internal 4 µA current charges external capacitor for controlled ramp-up.
4 SYNCH/ISKP	Sync input / skip-level select	In LNM: accepts external clock; in LCM: selects current threshold for burst-mode entry.
5 FSW	Frequency selection	Resistor divider to VCC/GND sets f_SW before soft-start; supports E24 series values.
6 MLF	Mode and RST threshold select	Configures LNM vs LCM and sets RST trip point (e.g., 93% of VOUT for 5 V = ~4.65 V).
7 COMP	Error amplifier output	Connects to RC compensation network; drives PWM comparator based on feedback error.
8 DELAY	RST assertion delay timing	Capacitor value sets delay before RST releases after VOUT recovers-enables precise sequencing.
9 VOUT	Feedback sense node	Monitors regulated output; internal 5 V reference used for A6985F5VTR variant.
10 SGND	Signal ground	Reference for analog blocks; must be separated from PGND to avoid noise coupling into COMP/VFB.
11–12 PGND	Power ground	High-current return path for LX switches; connected to exposed pad for thermal performance.
13–14 LX	Switching node	Drives external inductor; requires low-inductance layout and snubber if needed for EMI reduction.
15 VIN	Main input supply	Accepts 4–38 V; internal UVLO thresholds (2.7 V rise / 2.4 V fall) prevent erratic startup.
16 VBIAS	Switchover auxiliary supply	Connect to regulated output to reduce IQ; internal switchover threshold ~3.0 V.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 (−40 °C to +125 °C ambient), qualified for under-hood and body control modules.
Low-noise operation	LNM forces constant-frequency PWM with <10 mV_PP output ripple-meets car audio EMC requirements.
Light-load efficiency	LCM achieves 30 µA IQ at 3.3 V output, enabling >10-year shelf life in battery-backed telematics units.
Integrated protection	Overcurrent (foldback), overvoltage (OVP discharge), thermal shutdown, and UVLO-no external ICs required.
Power sequencing support	RST open-collector with user-adjustable delay enables controlled power-up of multi-rail systems (e.g., MCU + CAN transceiver).

Applications

Infotainment Power Supply

Body Control Module (BCM)

Use Scenario: Stable 5 V rail for display controller, touch interface, and audio codec in automotive infotainment head units.

IC Role / Device Role / Timing Role: Primary buck regulator providing clean, low-noise 5 V output with LNM mode active during audio playback.

Use Value: Maintains <10 mV_PP output ripple at 250 kHz–2 MHz switching frequencies-eliminates audible switching noise in speakers.

Use Scenario: Always-on 5 V supply for door module microcontrollers monitoring window position and lock status during vehicle parking.

IC Role / Device Role / Timing Role: Standby regulator operating in LCM mode with 30 µA quiescent current and 100% duty cycle capability.

Use Value: Enables >18-month battery runtime without recharge-meets OEM requirements for low-power body electronics.

Telematics Control Unit (TCU)

Advanced Driver Assistance Systems (ADAS) Sensor Hub

Use Scenario: Powering GPS receiver, cellular modem, and secure element in connected vehicle TCU with wake-on-LIN/CAN capability.

IC Role / Device Role / Timing Role: Main system regulator with RST-driven reset sequencing and VBIAS switchover to reduce standby IQ.

Use Value: Delivers reliable power-up sequence for cryptographic boot and firmware validation-ensures functional safety compliance.

Use Scenario: Secondary 5 V rail for radar preprocessing unit requiring tight voltage tolerance and fast transient response.

IC Role / Device Role / Timing Role: Synchronous buck converter with internal current limiting and OVP to protect sensitive RF front-end components.

Use Value: Limits fault energy during short-circuit events-prevents latch-up in adjacent 1.2 V/1.8 V LDOs powering FPGA logic.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LMQ66430QRNXTQ1	3.8–36 V input, 3 A output, 15 µA IQ, integrated MOSFETs, but no RST supervisor or MLF mode select.	Lacks built-in reset supervision and configurable LCM/LNM-requires external reset IC and control logic for sequencing.	Preferred when higher current (>0.5 A) and lower IQ are critical, and sequencing is handled externally.
TPS62933EVM-051	3–18 V input, 3 A output, 25 µA IQ, adaptive COT control, but not AEC-Q100 qualified and lacks OVP.	Not automotive-qualified; no overvoltage protection or thermal shutdown with hysteresis-unsuitable for under-hood use.	Only suitable for non-automotive industrial or consumer applications where qualification and protection are secondary.

Compared with LM66430QRNXTQ1 and TPS62933EVM-051, the A6985F5VTR uniquely combines AEC-Q100 qualification, integrated RST supervisor with adjustable delay, dual LCM/LNM operation, and robust automotive protections-all in a 16-pin HTSSOP package optimized for space-constrained ECU designs.

Availability

A6985F5VTR is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and telematics units requiring stable component supply, long-lifecycle support, and AEC-Q100 compliance.

Supply support for A6985F5VTR 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 automotive, industrial, and power management ICs since 1987.

The A6985F belongs to ST's automotive-grade power management portfolio, engineered specifically for harsh-environment vehicle subsystems requiring high reliability, low IQ, and comprehensive fault protection.

FAQ

What is the purpose of the VBIAS pin on the A6985F5VTR?

The VBIAS pin enables switchover between VIN and an external regulated voltage (e.g., 5 V output) to power part of the internal analog circuitry. When VBIAS exceeds ~3.0 V, the device draws quiescent current from VBIAS instead of VIN, reducing total IQ to as low as 4 µA in shutdown and ~10 µA in LCM sleep-critical for extended battery life in always-on modules.

How does the MLF pin affect reset behavior in the A6985F5VTR?

The MLF pin selects both operating mode (LCM/LNM) and RST threshold voltage. For the A6985F5VTR variant, strapping MLF with 0 Ω to VCC configures LCM mode and sets RST trip at 93% of nominal output (4.65 V), while 39 kΩ to GND sets 96% (4.80 V). This allows precise alignment of reset assertion with downstream µC brown-out thresholds without external resistive dividers.

Can the A6985F5VTR synchronize to an external clock, and what are the constraints?

Yes-the SYNCH/ISKP pin supports master/slave synchronization in LNM mode only. It accepts TTL/CMOS-compatible clocks up to 2.2 MHz, with fan-out supporting up to six slave devices. In LCM mode, the same pin selects skip-current threshold. External clock must be stable during soft-start; synchronization is disabled if MLF is configured for LCM, and the pin must be left floating when unused in LNM.

What thermal derating guidance applies to the A6985F5VTR in HTSSOP16 package?

With R_thJA = 40 °C/W on ST's demo board, the A6985F5VTR delivers full 0.5 A output up to +85 °C ambient assuming 2 oz copper, 2 thermal vias under the exposed pad, and minimal airflow. Above 85 °C, output current must be linearly reduced to maintain T_J ≤ 150 °C; thermal shutdown activates at 165 °C with 30 °C hysteresis, allowing safe recovery without manual reset.

A6985F5VTR 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:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 4V

Voltage - Input (Max):: 38V

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

Voltage - Output (Max):: -

Current - Output:: 500mA

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

A6985F5VTR FAQ

1.How can I place an order for A6985F5VTR through Aetrix?

Please submit a Request for Quotation (RFQ) for A6985F5VTR 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 A6985F5VTR reliable?

The price and inventory of A6985F5VTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6985F5VTR is usually 5 days.

3.What payment methods are accepted for A6985F5VTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6985F5VTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A6985F5VTR?

A6985F5VTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A6985F5VTR 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 A6985F5VTR?

For technical support, including A6985F5VTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6985F5VTR requirements.

6.How does Aetrix verify that A6985F5VTR is sourced from the original manufacturer or authorized distributors?

All A6985F5VTR 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 A6985F5VTR meets industry standards.

7.What is the process for return or replacement of A6985F5VTR?

All A6985F5VTR units undergo pre-shipment inspection (PSI). If there is an issue with A6985F5VTR, 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 A6985F5VTR part is unused and in its original packaging.

Return procedure for A6985F5VTR:

1.Submit a request within 90 days.

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

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