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

STMicroelectronics A6985F5V

Name: A6985F5V
Brand: STMicroelectronics
SKU: A6985F5V
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A6985F5V

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: A6985F5V.pdf

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

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Product details

Overview

A6985F5V from STMicroelectronics is an AEC-Q100 qualified automotive synchronous step-down DC-DC regulator delivering 500 mA 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 A6985F5V datasheet, A6985F5V pinout, A6985F5V application, or A6985F5V equivalent, key selection criteria include LCM/LNM mode selection via MLF pin, RST supervisor threshold configuration, adjustable soft-start timing, and thermal shutdown at 165 °C with 30 °C hysteresis.

Technical Context

The A6985F5V implements a peak current mode controller with embedded P-channel high-side (R_DS(ON) = 360 mΩ) and N-channel low-side (R_DS(ON) = 150 mΩ) MOSFETs, enabling 100% duty cycle operation for cold-crank support. It features dual operating modes: Low Consumption Mode (LCM) for ultra-low I_Q (30 µA at light load) and Low Noise Mode (LNM) for constant-frequency PWM and minimized output ripple in audio-sensitive applications.

Internal functional blocks include a transconductance error amplifier (100 dB gain), programmable synchronization (up to 6 slaves), pulse-by-pulse overcurrent protection with foldback, and an open-drain RST output with adjustable delay via external capacitor on DELAY pin-supporting voltage sequencing and digital load reset coordination.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 5.0 V ±1.5%, verified per Table 5: 4.925–5.075 V at TJ = –40 to +135 °C
Input Voltage Range	4 V to 38 V-supports automotive cold-crank (down to 4 V) and load-dump (up to 38 V) transients
Quiescent Current (LCM)	30 µA at light load (V_OUT = 3.3 V); for A6985F5V, typical I_Q = 70 µA (V_BIAS = GND) per Table 5
Shutdown Current	8 µA max-enables ultra-low power-off state for always-on automotive modules
Switching Frequency	Adjustable 250 kHz to 2 MHz via FSW pinstrapping-allows EMI optimization and compact magnetics design
Thermal Shutdown	165 °C trip with 30 °C hysteresis-prevents damage during sustained overload or poor PCB thermal design
R_DS(ON) HS / LS	360 mΩ / 150 mΩ at I_SW = 0.5 A-determines conduction loss and efficiency at medium-to-heavy loads

Pinout & Package

HTSSOP16 package (exposed pad, R_thJA = 40 °C/W), RoHS-compliant, thermally enhanced for automotive under-hood use.

Pin/Terminal	Circuit Role	Design Meaning
1 RST	Open-collector reset output	Asserts low when V_OUT falls below programmed threshold; delay set by C_DELAY on Pin 8
2 VCC	Analog supply rail	Powers internal reference and error amplifier; requires ≥470 nF ceramic bypass capacitor
3 SS/INH	Soft-start / inhibit control	Pull to GND disables regulator; internal 4 µA current charges external C_SS for controlled ramp-up
4 SYNCH/ISKP	Sync input / skip level select	In LNM: accepts external clock; in LCM: selects current skip threshold (0.15–0.5 A)
5 FSW	Frequency selection	Resistor divider to VCC/GND sets f_SW from 250 kHz to 2 MHz before soft-start completes
6 MLF	Mode and RST threshold select	Configures LCM vs LNM and RST trip point (e.g., 93% of V_OUT = 4.65 V for A6985F5V)
7 COMP	Error amplifier output	Connects to RC compensation network; drives PWM comparator with 6 µA output capability
8 DELAY	RST assertion delay timing	External capacitor sets delay between V_OUT recovery and RST release (typ. 1–100 ms)
9 VOUT	Feedback sense node	Direct connection to regulated output; internal 5 V divider sets V_FB = 0.85 V reference
10 SGND	Signal ground reference	Separate from PGND to minimize noise coupling into feedback and error amplifier paths
11–12 PGND	Power ground return	Dual pins reduce IR drop and improve thermal dissipation for high-current switching paths
13–14 LX	Switching node	Connects to external inductor; high di/dt path requiring short, low-inductance layout
15 VIN	Main input supply	Accepts 4–38 V; internal UVLO thresholds at 2.7 V (rising) and 2.4 V (falling)
16 VBIAS	Efficiency-boosting bias supply	Optional connection to V_OUT reduces I_Q further; switchover threshold 2.85–3.2 V

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 (–40 °C to +125 °C ambient), validated for 15-year vehicle life
Low-noise mode (LNM)	Constant-frequency PWM operation minimizes spectral energy spread-critical for car audio EMC compliance
Output voltage supervisor	Programmable RST threshold (e.g., 93% of 5 V = 4.65 V) with adjustable delay enables FPGA/microcontroller power sequencing
100% duty cycle capability	Enables dropout-free regulation down to VIN = VOUT-essential for cold-crank (4 V) operation with 5 V output
Synchronization support	Master/slave sync up to 6 devices; eliminates beat frequencies in multi-rail automotive systems
Switchover biasing	VBIAS pin allows partial internal supply from VOUT, reducing total I_Q by >50% in parking-mode applications

Applications

Body Control Module (BCM)

Infotainment Power Supply

Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in door modules and lighting controllers during vehicle sleep mode.

IC Role / Device Role / Timing Role: Primary 5 V buck regulator with ultra-low 70 µA quiescent current in LCM, enabling <100 µA system standby draw.

Use Value: Extends battery life during weeks-long parking; meets OEM requirements for <30 µA module-level leakage.

Use Scenario: Generating clean 5 V rail for DSPs, ADCs, and audio codecs in head units with strict EMI limits.

IC Role / Device Role / Timing Role: Fixed-output buck converter operating in LNM with constant 2 MHz switching-suppressing switching noise in 20 Hz–20 kHz band.

Use Value: Eliminates audible switching artifacts and passes CISPR-25 Class 5 radiated emissions without shielding.

Telematics Control Unit (TCU)

ADAS Camera Power

Use Scenario: Supplying LTE modem, GNSS receiver, and secure element in always-connected telematics gateways.

IC Role / Device Role / Timing Role: Regulator with RST supervisor and programmable delay ensures synchronized boot of cellular and positioning subsystems.

Use Value: Prevents race conditions during power-up; guarantees VOUT stable for 100 ms before releasing RST to modem MCU.

Use Scenario: Powering image sensors and ISP processors in rear-view and surround-view cameras exposed to engine bay temperatures.

IC Role / Device Role / Timing Role: High-reliability buck converter with 165 °C thermal shutdown and AEC-Q100 qualification for under-hood mounting.

Use Value: Sustains operation up to +125 °C ambient; thermal hysteresis prevents cycling during transient overheating.

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 3.5 A output, 3.5–36 V input, 15 µA I_Q, but no RST supervisor or LNM mode	Targeted at higher-power ADAS ECUs-not suitable for low-noise audio or precise sequencing needs	Select when >500 mA load current or wider VIN range required; avoid if RST or LNM functionality is mandatory
TPS62903-Q1	500 mA, 3–18 V input, 25 µA I_Q, integrated PMBus-but lacks automotive-grade thermal shutdown (150 °C only) and no switchover biasing	Designed for infotainment SoCs with digital control; not rated for cold-crank (4 V) or load-dump (38 V)	Prefer for digitally managed systems with <18 V supply; reject for body electronics requiring 4–38 V robustness

Compared with LM61480-Q1 and TPS62903-Q1, the A6985F5V uniquely combines automotive-grade cold-crank support, dual LCM/LNM modes, integrated RST supervisor with delay, and VBIAS switchover-making it the only choice for cost-sensitive, noise-sensitive, and sequencing-critical 500 mA automotive rails.

Availability

A6985F5V is available at Aetrix Electronics and suitable for automotive body electronics, telematics control units, and infotainment power supplies requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for A6985F5V 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, designing and manufacturing automotive-grade analog, power, and microcontroller solutions since 1987.

The A6985F belongs to ST's Automotive Power Switching Regulators product line-engineered specifically for harsh-environment vehicle subsystems requiring AEC-Q100 compliance, cold-crank resilience, and ultra-low quiescent current.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The A6985F5V is specified for continuous operation up to +135 °C junction temperature. Its thermal shutdown activates at +165 °C (typical) with 30 °C hysteresis, ensuring safe recovery. The HTSSOP16 package has R_thJA = 40 °C/W on ST's demo board; actual T_J must be calculated using measured power dissipation and PCB thermal design.

How do I configure the RST output to assert after a 50 ms delay following VOUT regulation?

Connect a 47 nF capacitor between Pin 8 (DELAY) and SGND. Per Table 5, I_CH = 2 µA (typ.) charges C_DELAY; t_DELAY ≈ C × V_THD / I_CH. With V_THD = 1.234 V and I_CH = 2 µA, 47 nF yields ~29 ms-use 82 nF for ~50 ms. Do not leave DELAY floating; that configures RST as simple Power Good.

Can the A6985F5V operate with VIN = 5.5 V while regulating 5 V output?

Yes-the A6985F5V supports 100% duty cycle operation, enabling dropout-free regulation when VIN ≤ VOUT. At VIN = 5.5 V, the device enters 100% ON-time mode with no switching, delivering 5 V output with minimal dropout (dominated by R_DS(ON) HS). This satisfies cold-crank scenarios where input dips to 4 V while maintaining regulated 5 V.

What is the purpose of the VBIAS pin, and how does it reduce quiescent current?

VBIAS supplies part of the internal analog circuitry from the regulated output instead of VIN, reducing total I_Q. When VBIAS = 5 V, the internal switchover circuit engages at ~3.0 V, cutting I_Q from 70 µA (VBIAS = GND) to ~25 µA (LCM, VBIAS = 5 V) per Table 5. Connect VBIAS directly to VOUT via short trace; leave unconnected if unused.

A6985F5V 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:: 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

A6985F5V FAQ

1.How can I place an order for A6985F5V through Aetrix?

Please submit a Request for Quotation (RFQ) for A6985F5V 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 A6985F5V reliable?

The price and inventory of A6985F5V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6985F5V is usually 5 days.

3.What payment methods are accepted for A6985F5V?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6985F5V transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A6985F5V?

A6985F5V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A6985F5V 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 A6985F5V?

For technical support, including A6985F5V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6985F5V requirements.

6.How does Aetrix verify that A6985F5V is sourced from the original manufacturer or authorized distributors?

All A6985F5V 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 A6985F5V meets industry standards.

7.What is the process for return or replacement of A6985F5V?

All A6985F5V units undergo pre-shipment inspection (PSI). If there is an issue with A6985F5V, 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 A6985F5V part is unused and in its original packaging.

Return procedure for A6985F5V:

1.Submit a request within 90 days.

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

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