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STMicroelectronics A6986F5VTR
- Part No.:
- A6986F5VTR
- Manufacturer:
- STMicroelectronics
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
A6986F5VTR.pdf
- Description:
- IC REG BUCK 5V 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:656
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Product details
Overview
A6986F5VTR from STMicroelectronics is an AEC-Q100 qualified automotive synchronous step-down switching regulator delivering 1.5 A DC output current, operating from 4 V to 38 V input, with 30 µA quiescent current in Low Consumption Mode (LCM) at 3.3 V output, and featuring embedded voltage supervision, adjustable soft-start, and peak current mode control for cold-crank–compliant power conversion in body electronics.
For engineers reviewing the A6986F5VTR datasheet, A6986F5VTR pinout, A6986F5VTR application, or A6986F5VTR equivalent, key selection criteria include LCM/LNM mode selection via MLF pinstrapping, RST open-collector reset timing control via DELAY capacitor, VIN-to-VOUT regulation stability under load dump (38 V max), and thermal shutdown at 165 °C with 30 °C hysteresis.
Technical Context
The A6986F5VTR implements a peak current mode architecture with pulse-by-pulse high-side/low-side current sensing for constant-current protection and foldback during short-circuit. Its internal P-channel high-side switch enables 100% duty cycle operation, satisfying automotive cold-crank requirements down to 4 V input.
Two configurable operating modes are supported: Low Noise Mode (LNM) enforces constant-frequency PWM with synchronization capability (up to 6 slaves), while Low Consumption Mode (LCM) enables variable-frequency operation to minimize light-load IQ to 30 µA - both selected via MLF pinstrapping before soft-start.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1.5 A DC continuous - supports automotive body ECUs and infotainment modules without external current boosting. |
| Input voltage range | 4 V to 38 V - meets ISO 16750-2 load dump and cold-crank specifications for 12 V automotive systems. |
| Quiescent current (LCM) | 30 µA at light-load (VOUT = 3.3 V) - extends battery life in always-on parking-mode applications like LCM (Lighting Control Module). |
| Switching frequency | 250 kHz to 2 MHz - adjustable via FSW pinstrapping; enables EMI optimization and compact magnetics design. |
| RDS(on) HS / LS | 180 mΩ / 150 mΩ - reduces conduction loss at medium-to-heavy loads, improving full-load efficiency >90%. |
| Thermal shutdown | 165 °C with 30 °C hysteresis - protects die during sustained overload or poor PCB thermal layout (RthJA = 40 °C/W). |
| Reset threshold accuracy | ±3% over temperature - ensures reliable µC/FPGA reset assertion across -40 °C to +135 °C junction range. |
Pinout & Package
Package: HTSSOP16 (exposed pad, RthJA = 40 °C/W). 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 VOUT falls below programmed threshold (e.g., 93% of nominal); DELAY capacitor sets release timing after recovery. |
| 3 SS/INH | Soft-start / inhibit input | Pulled low disables regulator; internal 4 µA current source charges external capacitor to control ramp rate and limit inrush. |
| 4 SYNCH/ISKP | Sync input / skip level select | In LNM: accepts external clock for master/slave sync; in LCM: selects skip current threshold (0.2–0.6 A) via VCC/GND strapping. |
| 5 FSW | Frequency selection input | Resistor divider to VCC/GND sets fSW from 250 kHz to 2 MHz - configuration locked before soft-start completes. |
| 6 MLF | Mode and reset threshold select | Selects LNM vs. LCM and programs RST trip point (e.g., 80%, 87%, 93%, 96% of VOUT) via resistor strapping. |
| 7 COMP | Error amplifier output | Connects external RC compensation network to stabilize loop response; ±6 µA output drive supports standard Type II/III designs. |
| 8 DELAY | Reset delay timing | Capacitor here sets time delay (µs to ms) before RST releases after VOUT recovers above threshold - enables clean power sequencing. |
| 9 VOUT | Feedback sense node | Monitors regulated output; internal 0.85 V reference allows adjustable outputs or fixed 3.3 V/5 V variants (A6986F3V3/A6986F5V). |
| 13–14 LX | Power switch node | Connects to external inductor; dual LX pins reduce parasitic inductance and improve EMI performance in high-dI/dt switching. |
| 15 VIN | Main power input | Accepts 4–38 V DC; internal UVLO (2.7 V rising) prevents erratic startup during brownout or cranking. |
| 16 VBIAS | Internal supply switchover | When tied to regulated output (e.g., 5 V), reduces IQ by powering analog circuitry from VBIAS instead of VIN - improves light-load efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded voltage supervisor with programmable RST | Enables system-level reset coordination for microcontrollers and FPGAs; RST threshold set via MLF strapping (±3% accuracy). |
| Peak current mode control with pulse-by-pulse limiting | Provides fast transient response and robust short-circuit protection; foldback reduces stress on external components during hard shorts. |
| Low Consumption Mode (LCM) with 30 µA IQ | Extends battery runtime in parked-car applications (e.g., telematics, alarm systems) while maintaining tight output regulation. |
| Low Noise Mode (LNM) with constant-frequency PWM | Meets stringent EMI and ripple requirements for car audio and ADAS sensors; supports external clock synchronization up to 2 MHz. |
| 100% duty cycle capability | Ensures uninterrupted operation during cold-crank events down to 4 V input - critical for engine control and lighting modules. |
Applications
| Automotive Body Control Module (BCM) | Car Audio Power Supply |
|---|---|
|
Use Scenario: Centralized power management for door locks, window lifts, and interior lighting in modern BCMs. IC Role / Device Role / Timing Role: Primary 5 V/3.3 V buck converter supplying MCU, CAN transceivers, and sensor interfaces. Use Value: 38 V input rating withstands load dump transients; LCM mode maintains <30 µA IQ during vehicle sleep, reducing parasitic drain. |
Use Scenario: Clean, low-noise 5 V rail for DSPs, amplifiers, and ADCs in premium infotainment head units. IC Role / Device Role / Timing Role: Synchronous buck regulator operating in LNM with synchronized 1.5 MHz switching to avoid AM band interference. Use Value: Constant-frequency PWM and optimized gate drive minimize output voltage ripple (<10 mVpp), preserving audio SNR. |
| Telematics Control Unit (TCU) | ADAS Camera Power Sequencing |
|
Use Scenario: Always-on power for LTE modems, GNSS receivers, and secure boot processors in cellular-connected TCUs. IC Role / Device Role / Timing Role: Primary 3.3 V regulator with RST output managing safe boot sequence and brownout recovery. Use Value: Embedded supervisor asserts RST within 10 µs of undervoltage; DELAY capacitor ensures controlled reset hold time for firmware integrity. |
Use Scenario: Multi-rail power delivery for image sensors, ISP, and MIPI interface in surround-view camera modules. IC Role / Device Role / Timing Role: Voltage sequencer using RST open-drain output to enable downstream LDOs in precise order (e.g., AVDD → DVDD → I/O). Use Value: Programmable RST threshold (e.g., 93% of 1.8 V) and DELAY timing ensure deterministic power-up alignment across sensor and processor 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 |
|---|---|---|---|
| LMQ66430QRNXTQ1 | 3.3 V fixed output only; 2.5 A rating; 2.5 µA shutdown IQ; no RST supervisor or LCM/LNM mode selection. | Lacks programmable reset and dual-mode operation - unsuitable for systems requiring parking-mode efficiency or coordinated power sequencing. | Choose when higher current (2.5 A) and ultra-low shutdown IQ are prioritized over supervisor features and light-load flexibility. |
| TPS62933EVM-051 | 3.3 V/5 V selectable; 3 A output; 15 µA IQ in DCM; no AEC-Q100 qualification; no integrated RST or sync capability. | Not automotive-qualified; lacks voltage supervision and synchronization - limited to industrial or consumer-grade designs. | Prefer for non-automotive applications needing higher current and lower IQ, where AEC-Q100 and reset functionality are not required. |
Compared with LM66430QRNXTQ1 and TPS62933EVM-051, the A6986F5VTR uniquely combines AEC-Q100 qualification, dual LCM/LNM operation, programmable RST with DELAY timing, and 38 V input tolerance - making it the only option among the three qualified for safety-critical automotive body and infotainment power domains.
Availability
A6986F5VTR is available at Aetrix Electronics and suitable for automotive body control modules, telematics units, car audio subsystems, and ADAS camera power supplies requiring stable component supply across extended temperature and lifecycle demands.
Supply support for A6986F5VTR 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 broad portfolio coverage from microcontrollers to analog and power devices.
The A6986F series belongs to ST's automotive-grade power management product line, designed specifically for robust, low-IQ DC-DC conversion in harsh-temperature, high-reliability vehicle subsystems including BCM, lighting, and infotainment.
FAQ
What is the maximum allowable input voltage for A6986F5VTR, and how does it handle load dump conditions?
The A6986F5VTR supports up to 38 V DC input, exceeding ISO 16750-2 Category A load dump requirements (35 V, 400 ms). Its internal overvoltage protection triggers at 1.2× VREF (≈6 V for 5 V variant), clamping output and discharging capacitors to prevent downstream damage during transient overvoltage events.
How is the reset (RST) output configured, and what determines its assertion timing?
RST is an open-collector output asserting low when VOUT drops below a threshold set by MLF pinstrapping (e.g., 93% of nominal). After recovery, RST remains low for a user-defined delay set by an external capacitor on the DELAY pin - enabling precise power-up sequencing with typical timing from 100 µs to 100 ms.
Can A6986F5VTR operate in both constant-frequency and variable-frequency modes, and how is mode selection implemented?
Yes: Low Noise Mode (LNM) forces constant-frequency PWM for EMI-sensitive applications like car audio; Low Consumption Mode (LCM) enables variable-frequency operation to minimize IQ to 30 µA at light load. Mode selection is performed via resistor strapping on the MLF pin prior to soft-start initiation - configuration is latched and immutable thereafter.
What thermal derating guidance applies when using A6986F5VTR on a standard 2-layer PCB?
With RthJA = 40 °C/W on ST's demo board, a 2-layer PCB without thermal vias or copper pour will exhibit higher junction temperatures. At 1.5 A and 12 V input, power dissipation ≈0.4 W; ambient rise ≈16 °C. Derate output current by ~15% above 85 °C ambient to maintain TJ < 135 °C and avoid thermal shutdown activation.
A6986F5VTR 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:
- 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
A6986F5VTR FAQ
1.How can I place an order for A6986F5VTR through Aetrix?
Please submit a Request for Quotation (RFQ) for A6986F5VTR 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 A6986F5VTR reliable?
The price and inventory of A6986F5VTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6986F5VTR is usually 5 days.
3.What payment methods are accepted for A6986F5VTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6986F5VTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6986F5VTR?
A6986F5VTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6986F5VTR 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 A6986F5VTR?
For technical support, including A6986F5VTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6986F5VTR requirements.
6.How does Aetrix verify that A6986F5VTR is sourced from the original manufacturer or authorized distributors?
All A6986F5VTR 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 A6986F5VTR meets industry standards.
7.What is the process for return or replacement of A6986F5VTR?
All A6986F5VTR units undergo pre-shipment inspection (PSI). If there is an issue with A6986F5VTR, 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 A6986F5VTR part is unused and in its original packaging.
Return procedure for A6986F5VTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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