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STMicroelectronics A6986FTR
- Part No.:
- A6986FTR
- Manufacturer:
- STMicroelectronics
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
A6986FTR.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
A6986FTR 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 peak current mode architecture, embedded voltage supervisor (RST), and adjustable soft-start for cold-crank–resilient power delivery in body control modules.
For engineers reviewing the A6986FTR datasheet, A6986FTR pinout, A6986FTR application, or A6986FTR equivalent, key selection criteria include LCM/LNM mode selection via MLF pinstrapping, VIN-to-VOUT 100% duty cycle capability for automotive load dump compliance, RST open-collector reset timing controlled by external DELAY capacitor, and HTSSOP16 thermal performance (RthJA = 40 °C/W).
Technical Context
The A6986FTR implements a peak current mode control architecture with pulse-by-pulse high-side/low-side current sensing, enabling precise constant-current protection and foldback during heavy short-circuit. Its integrated P-channel high-side switch (RDS(on) = 180 mΩ) supports 100% duty cycle operation critical for cold-crank conditions.
Two configurable operating modes are hardware-selected via MLF pin: Low Noise Mode (LNM) enforces constant-frequency PWM with minimized output ripple for car audio systems, while Low Consumption Mode (LCM) enables discontinuous conduction for ultra-low 30 µA IQ at light load. Synchronization (master/slave) and switchover functionality (VBIAS biasing) further optimize system-level noise and efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A DC continuous - supports automotive ECUs, sensors, and infotainment subsystems without external boost stages. |
| Input Voltage Range | 4 V to 38 V - meets ISO 16750-2 load dump (35 V/100 ms) and cold-crank (4.5 V) requirements for 12 V automotive systems. |
| Quiescent Current (LCM) | 30 µA at VOUT = 3.3 V - enables always-on functionality in parking-mode applications (e.g., alarm, telematics) with minimal battery drain. |
| Switching Frequency | 250 kHz to 2 MHz - adjustable via FSW pinstrapping; higher frequencies reduce external inductor/capacitor size for compact PCB layouts. |
| RDS(on) HS / LS | 180 mΩ / 150 mΩ - low conduction losses improve full-load efficiency (>90% typical at 1 A, 12 VIN → 5 VOUT). |
| Reset Threshold Accuracy | ±3% over temperature - RST output asserts when VOUT falls below programmable threshold (e.g., 93% of nominal), ensuring reliable µC/FPGA reset sequencing. |
| Thermal Shutdown | 165 °C with 30 °C hysteresis - protects die during sustained overload or poor heatsinking; HTSSOP16 exposed pad must connect to SGND/PGND. |
Pinout & Package
Package: HTSSOP16 (exposed pad), RthJA = 40 °C/W (on ST demo board), RoHS-compliant, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RST | Open-collector reset output | Asserts low when VOUT drops below programmed threshold; DELAY capacitor sets release timing after regulation recovery. |
| 2 VCC | Internal analog supply | Requires ≥470 nF ceramic capacitor; powers internal reference and error amplifier; UVLO thresholds: 2.7 V (rising), 2.4 V (falling). |
| 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 current. |
| 4 SYNCH/ISKP | Sync input / skip level select | In LNM: accepts external clock (266.5–2200 kHz); in LCM: selects skip current threshold (0.2–0.6 A) via pull-up/down resistor. |
| 5 FSW | Frequency selection | Resistor divider to VCC/GND sets fSW (250 kHz–2 MHz); configuration latched before soft-start begins to minimize startup current. |
| 6 MLF | Mode and RST threshold select | Determines LNM vs. LCM operation and RST trip point (e.g., 80%, 87%, 93%, or 96% of VOUT) via E24 resistor strapping. |
| 7 COMP | Error amplifier output | Connects external RC compensation network; transconductance = 100 µS typ.; ±6 µA output drive capability. |
| 8 DELAY | RST delay timing | External capacitor sets time delay (≈1 µA × C) before RST releases after VOUT recovers above threshold. |
| 9 VOUT | Feedback sense node | Connects to resistor divider from regulated output; internal reference = 0.85 V; supports fixed 3.3 V/5 V or adjustable 0.85 V–VIN. |
| 10 SGND | Signal ground | Analog ground reference for VCC, COMP, and feedback circuitry; must be star-connected to PGND at single point near IC. |
| 11–12 PGND | Power ground | High-current return path for LX switches; both pins must connect directly to exposed pad and low-impedance ground plane. |
| 13–14 LX | Switching node | Connects to external inductor; high di/dt node requiring tight layout and minimized loop area to reduce EMI. |
| 15 VIN | Main input supply | Accepts 4–38 V; requires local ceramic input capacitor (≥10 µF) close to VIN–PGND; absolute max = 40 V. |
| 16 VBIAS | Switchover bias supply | Optional connection to regulated output (e.g., 3.3 V/5 V) to reduce IQ from VIN; threshold = 2.85–3.2 V for switchover activation. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (−40 °C to +125 °C ambient, junction up to +150 °C) - validated for under-hood and cabin applications. |
| 100% duty cycle operation | Enables dropout < 100 mV at 1.5 A - sustains regulated output during cold-crank (down to 4.5 V battery) without dropout. |
| Embedded voltage supervisor | RST open-collector output with user-programmable threshold and delay - eliminates need for external reset IC in µC/FPGA power sequencing. |
| Low-noise mode (LNM) | Fixed-frequency PWM with synchronized operation - reduces spectral energy spread, easing EMC filter design for car audio subsystems. |
| Overvoltage protection (OVP) | Active discharge of output capacitor when VOUT exceeds 1.15×VREF - prevents damage to downstream logic during transient overvoltage events. |
| Thermal shutdown with hysteresis | 165 °C trip, 30 °C hysteresis - ensures safe restart after cooling; exposed pad must be soldered to SGND/PGND for effective heat transfer. |
Applications
| Body Control Module (BCM) | Infotainment Power Supply |
|---|---|
|
Use Scenario: Centralized power management for door locks, lighting, window lifts, and HVAC actuators in modern vehicle architectures. IC Role / Device Role / Timing Role: Primary 5 V/3.3 V buck converter supplying microcontrollers, CAN transceivers, and sensor interfaces with cold-crank resilience. Use Value: 100% duty cycle and 4 V minimum input ensure uninterrupted operation during engine start; LCM mode extends battery life in sleep states. |
Use Scenario: Clean, low-noise 3.3 V rail for DSPs, touch controllers, and display drivers in head units and digital clusters. IC Role / Device Role / Timing Role: Secondary regulated supply operating in LNM with synchronized switching to suppress conducted EMI into sensitive analog audio paths. Use Value: Constant-frequency operation and adjustable fSW enable precise EMI filtering; RST sequencing coordinates boot order with main SoC. |
| Telematics Control Unit (TCU) | ADAS Camera Power |
|
Use Scenario: Always-on connectivity module supporting LTE, GNSS, and OTA updates, requiring ultra-low standby current. IC Role / Device Role / Timing Role: Primary 3.3 V supply configured in LCM with 30 µA IQ, managed by VBIAS switchover to minimize VIN loading. Use Value: 8 µA shutdown current and programmable RST delay prevent false wakeups; AEC-Q100 ensures reliability over 15-year vehicle lifecycle. |
Use Scenario: Compact, thermally constrained power stage for 12 MP image sensors and ISP processors in surround-view cameras. IC Role / Device Role / Timing Role: High-efficiency 1.8 V/1.2 V adjustable buck delivering 1.5 A with minimal thermal rise in sealed camera housings. Use Value: HTSSOP16 package with exposed pad achieves 40 °C/W θJA; OVP and thermal shutdown protect against lens heating-induced failures. |
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 |
|---|---|---|---|
| LM61480-Q1 | Higher 4 A output, 3.5–36 V input, 15 µA IQ (LP mode), but no embedded RST supervisor or VBIAS switchover. | Better suited for high-current ADAS domain controllers; lacks integrated reset sequencing for simpler MCU-based modules. | Select when >2 A output or lower IQ is primary; accept added BOM cost for external reset IC if sequencing required. |
| TPS62933-Q1 | 3 A output, 3–36 V input, 25 µA IQ, integrated PMBus interface, but only fixed 3.3 V/5 V options and no LNM/LCM dual-mode operation. | Ideal for digitally monitored power rails in gateway ECUs; lacks analog mode selection for analog-sensitive subsystems like audio. | Choose for telemetry-rich designs needing real-time voltage/current telemetry; avoid where analog noise floor or flexible reset thresholds are critical. |
Compared with LM61480-Q1 and TPS62933-Q1, the A6986FTR uniquely combines automotive-grade LCM/LNM dual-mode operation, programmable RST with delay, and VBIAS switchover in a single HTSSOP16 package-making it optimal for cost-sensitive, space-constrained body electronics where analog integrity and battery longevity are co-prioritized.
Availability
A6986FTR is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power supplies, and telematics control units requiring stable component supply across extended vehicle production lifecycles.
Supply support for A6986FTR 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 management ICs, and automotive-grade analog devices since 1987.
The A6986FTR belongs to ST's Automotive Power Switching Regulator product line, engineered specifically for robust, low-IQ, and functionally safe DC-DC conversion in harsh automotive environments-from body electronics to ADAS edge nodes.
FAQ
What is the maximum allowable input voltage for continuous operation?
The A6986FTR supports continuous operation up to 38 V input, with absolute maximum rating of 40 V. It is designed to withstand automotive load dump transients per ISO 16750-2 (35 V/100 ms) without latch-up or degradation, provided input capacitance and layout meet ST's recommended guidelines in AN5065.
How does the MLF pin configure RST threshold and operating mode?
The MLF pin uses resistor strapping to set both LNM/LCM mode and RST trip point: pulling to VCC or GND with E24 resistors selects one of four thresholds (e.g., 80%, 87%, 93%, 96% of VOUT) and determines whether the device operates in constant-frequency LNM or variable-frequency LCM for optimal light-load efficiency.
Can the A6986FTR synchronize to an external clock in Low Noise Mode?
Yes - in LNM, the SYNCH/ISKP pin accepts an external master clock (266.5–2200 kHz) to synchronize switching frequency across multiple A6986FTRs, reducing beat frequencies and simplifying EMI filter design. The pin must be left floating when synchronization is unused; no external pull-up/down is required.
What is the role of the VBIAS pin and how does switchover improve efficiency?
VBIAS connects to a clean, regulated output (e.g., 3.3 V or 5 V) to power part of the internal analog circuitry, reducing IQ drawn from VIN. Switchover activates when VBIAS exceeds 2.85 V, lowering total quiescent current by up to 70% in LCM - critical for extending battery life in always-on automotive modules.
A6986FTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 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
A6986FTR FAQ
1.How can I place an order for A6986FTR through Aetrix?
Please submit a Request for Quotation (RFQ) for A6986FTR 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 A6986FTR reliable?
The price and inventory of A6986FTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6986FTR is usually 5 days.
3.What payment methods are accepted for A6986FTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6986FTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6986FTR?
A6986FTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6986FTR 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 A6986FTR?
For technical support, including A6986FTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6986FTR requirements.
6.How does Aetrix verify that A6986FTR is sourced from the original manufacturer or authorized distributors?
All A6986FTR 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 A6986FTR meets industry standards.
7.What is the process for return or replacement of A6986FTR?
All A6986FTR units undergo pre-shipment inspection (PSI). If there is an issue with A6986FTR, 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 A6986FTR part is unused and in its original packaging.
Return procedure for A6986FTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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