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

STMicroelectronics A6902D13TR

Name: A6902D13TR
Brand: STMicroelectronics
SKU: A6902D13TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A6902D13TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: A6902D13TR.pdf

Description:: IC REG BUCK ADJ 1A 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

A6902D13TR from STMicroelectronics is an automotive-grade step-down switching regulator with integrated P-channel DMOS (R_DS(on) = 250 mΩ typ.) and dual-loop control-supporting both adjustable constant-voltage (1.235 V to 35 V) and constant-current operation (±5% accuracy via external sense resistor). It delivers up to 1 A DC output, operates from 8 V to 36 V input, and features internal 250 kHz fixed-frequency PWM, 3.3 V ±2% reference, and zero-load burst-mode operation-used in LED drivers and NiMH/NiCd battery chargers.

For engineers reviewing the A6902D13TR datasheet, A6902D13TR pinout, A6902D13TR application, or A6902D13TR equivalent, this device is selected for automotive power conversion where precise current limiting, thermal shutdown (150 °C ±10 °C), feedback disconnection protection, and AEC-Q100 qualification are required-especially in systems demanding stable 1 A output under wide-input-voltage transients.

Technical Context

The A6902D13TR implements a voltage-mode PWM architecture with two independent transconductance error amplifiers-one for voltage regulation (1.235 V reference, 70 dB gain) and one for current regulation (100 mV offset, 60 dB gain)-whose outputs are ORed into a single COMP node. Its oscillator integrates voltage feedforward and frequency-shifting logic that reduces switching frequency to ~83 kHz during overcurrent events.

Current protection includes both a precision average-current loop (via CS+/CS− pins, 100 mV across R_SENSE) and a fast pulse-by-pulse OCP with 270 ns blanking time, while thermal shutdown activates at T_J ≥ 150 °C with 20 °C hysteresis. The internal P-DMOS enables dropout-free operation down to V_OUT ≈ V_IN − 2 V and eliminates need for bootstrap capacitor.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	8 V to 36 V - supports full automotive battery range including cold-crank (6.5 V min not supported) and load-dump (40 V abs max).
Output Current	Up to 1 A DC - limited by internal current sense and thermal design; peak pulsed current up to 3.2 A (min/max spec).
Switching Frequency	250 kHz (±15%) - fixed internal oscillator enables predictable EMI filtering and compact magnetics selection.
Reference Voltage	1.235 V (FB pin) ±2.9% - sets base output voltage; external divider scales output up to 35 V.
R_DS(on)	250 mΩ (typ.) - low conduction loss enables >90% efficiency at 5 V/1 A, 12 V input.
Quiescent Current	3–5 mA - enables low-power standby; drops to 2.7 mA in zero-load mode.
Thermal Shutdown	150 °C ±10 °C - protects silicon during overload; hysteresis prevents oscillation near trip point.

Pinout & Package

Package: SO-8 (small-outline integrated circuit, 150 mil width), surface-mount, RoHS-compliant, thermal resistance R_thJA = 110 °C/W on standard demo board.

Pin/Terminal	Circuit Role	Design Meaning
1 OUT	Power switch drain output	Connects directly to inductor; carries full switched current; requires low-inductance layout to minimize ringing.
2 CS+	High-side current sense input	Measures voltage across external sense resistor's high-side terminal; used with CS− for differential current sensing.
3 CS−	Low-side current sense input	Completes current-sense differential pair; referenced to GND side of R_SENSE; rejects common-mode noise.
4 COMP	Compensation node	Shared compensation network for both voltage and current loops; connects RC/CC/CP network to GND.
5 FB	Voltage feedback input	Internal 1.235 V reference comparator input; direct connection yields 1.235 V output; resistive divider sets higher voltages.
6 VREF	3.3 V reference output	Stable 3.3 V ±2% source (5 mA max); no external capacitor needed; usable for biasing external circuitry.
7 GND	Analog and power ground	Single-point ground for FB, COMP, CS±, VREF; must be separated from high-current return paths to avoid noise coupling.
8 VCC	Unregulated input supply	Accepts 8–36 V; powers internal regulator and gate driver; bypass with ≥1 µF ceramic close to pin.

Key Features

Feature	Design Value
Dual-loop regulation	Simultaneous voltage and current control via shared COMP node-enables LED constant-current drive or battery charge with voltage foldback.
AEC-Q100 qualified	Qualified for automotive Grade 1 (-40 °C to +125 °C ambient), including HTOL, temperature cycling, and ESD testing per Rev 7 datasheet.
Zero-load burst mode	Operates without minimum load requirement-eliminates need for dummy load resistors in low-power sleep states.
Feedback disconnection protection	Shuts down if FB pin floats-prevents uncontrolled output voltage rise that could damage downstream loads.
Integrated P-DMOS switch	250 mΩ R_DS(on) enables high-efficiency buck conversion without external MOSFET or bootstrap components.

Applications

Automotive Interior Lighting

NiMH/NiCd Battery Charger

Use Scenario: Driving arrays of white LEDs in dashboard backlighting or ambient lighting modules under 12 V battery supply with wide input variation.

IC Role / Device Role / Timing Role: Constant-current source regulating LED string current via CS+/CS−; voltage loop disabled or set to safe clamp level.

Use Value: Delivers stable 350 mA–1 A LED current with ±5% accuracy across -40 °C to +125 °C, eliminating need for external current-sense IC.

Use Scenario: Charging 3-cell NiMH battery packs (3.6 V nominal) from vehicle 12 V system with programmable current limit and thermal foldback.

IC Role / Device Role / Timing Role: Adjustable current-limited buck converter with voltage termination via FB divider; OCP and thermal shutdown prevent overcharge.

Use Value: Enables single-chip CC/CV charging with 1.235 V reference accuracy and 250 kHz switching-reducing BOM count vs. discrete controller + MOSFET solutions.

Adjustable Automotive DC-DC Converter

Industrial Sensor Power Supply

Use Scenario: Generating stable 5 V or 3.3 V rail from 24 V truck battery for ECUs, requiring wide-input tolerance and AEC-Q100 compliance.

IC Role / Device Role / Timing Role: Step-down regulator with voltage feedback (FB) and optional current limit (CS+/CS−) for short-circuit robustness.

Use Value: Supports 8–36 V input with 90% efficiency at full load; internal 3.3 V reference simplifies auxiliary bias generation.

Use Scenario: Powering isolated analog sensors in industrial control cabinets where input voltage varies between 12–30 V DC.

IC Role / Device Role / Timing Role: Primary DC-DC converter with adjustable output (1.235–35 V) and precise current limiting to protect sensitive sensor front-ends.

Use Value: Eliminates need for external current-limiting transistor; zero-load operation ensures stable bias even when sensor is disconnected.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable-current buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM34917QMAX/NOPB	External N-MOSFET driver; requires bootstrap capacitor; 1.25 V reference; no integrated current-sense amplifier.	Needs external current-sense amp and op-amp for CC mode; less integrated for battery/LED use.	Choose when higher voltage (>40 V) or higher current (>2 A) is needed and layout space allows discrete FET.
TPS54302DDAR	Fixed 500 kHz frequency; no dedicated current-sense inputs; relies on external sense resistor + comparator for CC.	Lacks native dual-loop architecture-requires additional ICs to achieve accurate constant-current regulation.	Prefer for cost-sensitive non-automotive designs where only voltage regulation is required and thermal grade is commercial.

Compared with LM34917QMAX/NOPB and TPS54302DDAR, the A6902D13TR uniquely integrates both voltage and current error amplifiers, P-DMOS switch, and AEC-Q100 qualification-reducing component count and validation effort for automotive LED/battery applications requiring <1 A output.

Availability

A6902D13TR is available at Aetrix Electronics and suitable for automotive interior lighting, NiMH battery charging, and industrial sensor power supplies requiring stable component supply, AEC-Q100 compliance, and integrated current-limit functionality.

Supply support for A6902D13TR 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 ICs, sensors, and automotive-grade analog devices since 1987.

The A6902D product line targets automotive power conversion with integrated protection, delivering robust step-down regulation for LED lighting, battery charging, and ECU power rails under harsh electrical and thermal conditions.

FAQ

What is the maximum output current capability of the A6902D13TR under continuous operation?

The A6902D13TR supports up to 1 A DC output current continuously, verified across -40 °C to +125 °C ambient with proper PCB thermal design (SO-8 on 2-layer board with 1 cm² copper pour). Peak pulsed current reaches 3.2 A per datasheet Table 4, but sustained >1 A requires derating due to thermal limits (R_thJA = 110 °C/W).

Can the A6902D13TR operate without an external feedback resistor divider?

Yes-the FB pin has an internal 1.235 V reference, so connecting FB directly to OUT yields a fixed 1.235 V output. For any other voltage, an external resistive divider is mandatory; omitting it disables regulation and risks overvoltage on connected loads.

How does the current-sense interface (CS+ and CS−) function in constant-current mode?

CS+ and CS− form a differential input to the internal current error amplifier, measuring voltage across an external sense resistor (R_SENSE). Regulation maintains 100 mV across R_SENSE, yielding I_OUT = 0.1 / R_SENSE. Accuracy is ±5% over temperature, with typical offset of 100 mV confirmed in Table 4.

Is the A6902D13TR pin-compatible with earlier revisions like A6902D13T?

No-A6902D13TR uses tape-and-reel packaging (TR suffix) but shares identical pinout, electrical specs, and SO-8 footprint with A6902D13T. The "TR" denotes packaging only; no functional or mechanical differences exist between the two orderable variants.

A6902D13TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm 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):: 8V

Voltage - Input (Max):: 36V

Voltage - Output (Min/Fixed):: 1.235V

Voltage - Output (Max):: 35V

Current - Output:: 1A

Frequency - Switching:: 250kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

A6902D13TR FAQ

1.How can I place an order for A6902D13TR through Aetrix?

Please submit a Request for Quotation (RFQ) for A6902D13TR 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 A6902D13TR reliable?

The price and inventory of A6902D13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6902D13TR is usually 5 days.

3.What payment methods are accepted for A6902D13TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6902D13TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A6902D13TR?

A6902D13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A6902D13TR 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 A6902D13TR?

For technical support, including A6902D13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6902D13TR requirements.

6.How does Aetrix verify that A6902D13TR is sourced from the original manufacturer or authorized distributors?

All A6902D13TR 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 A6902D13TR meets industry standards.

7.What is the process for return or replacement of A6902D13TR?

All A6902D13TR units undergo pre-shipment inspection (PSI). If there is an issue with A6902D13TR, 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 A6902D13TR part is unused and in its original packaging.

Return procedure for A6902D13TR:

1.Submit a request within 90 days.

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

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