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Allegro MicroSystems ARG81801KESJSR
- Part No.:
- ARG81801KESJSR
- Manufacturer:
- Allegro MicroSystems
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
ARG81801KESJSR.pdf
- Description:
- IC REG BUCK ADJ 3A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,645
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Product details
Overview
ARG81801KESJSR from Allegro MicroSystems is an automotive-grade asynchronous buck regulator IC designed for car audio and infotainment power supplies. It delivers up to 3.0 A output current, supports 4.0–35 V input voltage, features ±1.0% output voltage accuracy (0°C to 85°C), 2.4 MHz max switching frequency, and integrated 110 mΩ high-side MOSFET.
For engineers reviewing the ARG81801KESJSR datasheet, ARG81801KESJSR pinout, ARG81801KESJSR application, or ARG81801KESJSR equivalent, key selection considerations include its AEC-Q100 qualification, sleep-mode current <5 µA at 85°C, external synchronization capability, Power OK (POK) open-drain output, and wettable-flank 24-pin QFN package with exposed thermal pad.
Technical Context
The ARG81801KESJSR employs current-mode PWM control with transconductance error amplifier (750 µA/V typ), programmable slope compensation, and soft-start ramping. Its enhanced idle/stop-start recovery suppresses output overshoot during VIN transients below 3.6 V.
It integrates protection logic for pulse-by-pulse overcurrent, hiccup-mode short-circuit response, BOOT open/short detection, VIN UVLO (3.6 V start), VOUT OVP (880 mV threshold), and thermal shutdown (170°C typ), all operating across –40°C to 150°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0 V to 35 V - supports wide automotive battery and load-dump conditions |
| Max Output Current | 3.0 A - sustained delivery with thermal derating per JEDEC 4-layer PCB (RθJA = 37°C/W) |
| Switching Frequency | 250 kHz to 2.4 MHz - adjustable via FSET resistor; synchronizable up to 2.9 MHz |
| Output Voltage Accuracy | ±1.0% (0°C to 85°C) - enables precise regulation for sensitive audio/processor rails |
| Sleep Mode Current | <5 µA at 85°C, 16 V VIN - ultralow quiescent power for always-on vehicle systems |
| Feedback Reference | 800 mV ±8 mV - sets VOUT = 0.8 V × (1 + RFB1/RFB2) with high-accuracy divider design |
| Power OK Delay | 26 µs typical - fast, deterministic POK assertion after regulation achieved |
Pinout & Package
ARG81801KESJSR is housed in a 24-pin wettable flank QFN package with exposed thermal pad (suffix ES), Pb-free with 100% matte-tin leadframe plating. The package supports automated optical inspection (AOI) and enhances thermal dissipation via direct PCB ground-plane connection through ≥6 vias under the pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2) | Power input for control circuitry and high-side MOSFET drain | Must connect to 4–35 V supply with local ceramic decoupling; dual pins reduce IR drop |
| SS (3) | Soft-start and hiccup timing node | Capacitor to GND sets startup ramp time (880 µs typ) and hiccup period |
| SLEEP (4) | Ultralow-power shutdown enable | Logic-low (<0.5 V) forces shutdown; 103 µs delay prevents false triggering |
| GND (5,16) | Signal and power ground reference | Dual ground pins minimize noise coupling into feedback and compensation paths |
| SYNC (6) | External clock synchronization input | Accepts 1.2× to 1.5× base fOSC; overrides internal oscillator when active |
| POK (7) | Open-drain Power OK status output | Asserts high-Z after 26 µs once VFB ≥ 880 mV - used for system sequencing and fault monitoring |
| FSET (8) | Frequency setting input | Resistor to GND programs base fOSC (e.g., 8.06 kΩ → 2.44 MHz) |
| NC (9–11,20–24) | No-connect terminals | Internally unconnected; recommended to tie to GND for thermal conduction |
| COMP (12) | Error amplifier output and loop compensation node | Connect RZ-CZ-CP network here for stable current-mode control |
| FB (13) | Negative feedback input | Monitors VOUT via resistor divider; 800 mV reference enables sub-1 V outputs |
| TEST (14) | Factory test and FB short-protection pin | Must be grounded via resistor; limits VOUT if FB shorts to TEST |
| VREG (15) | Internal 3.05 V LDO bypass | Requires 1 µF ceramic capacitor to GND for stable bias rail |
| SW (17,18) | High-side MOSFET source and power switch node | Connects to inductor and freewheeling diode; dual pins reduce trace inductance |
| BOOT (19) | High-side gate drive bootstrap supply | 47 nF ceramic cap to SW provides gate charge; protected against open/short faults |
| PAD | Exposed thermal pad | Must be soldered to solid GND plane with ≥6 thermal vias for thermal reliability |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 qualified | Rated for –40°C to 150°C junction temperature; validated for automotive infotainment environments |
| Enhanced Idle/Stop-Start Recovery | Actively suppresses VOUT overshoot during VIN recovery from undervoltage events |
| Pre-biased startup capability | Starts safely into pre-charged output without causing system reset or reverse current |
| External compensation | Full flexibility to optimize loop stability across wide frequency (250 kHz–2.4 MHz) and output capacitor types |
| Comprehensive fault protection | Includes pulse-by-pulse OCP, hiccup-mode short-circuit, BOOT OV/UV, diode OK detection, and thermal shutdown |
Applications
| Car Audio Amplifier Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Supplies 5 V or 3.3 V to Class D audio amplifiers and DSPs in head units with strict EMI and transient requirements. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator delivering regulated output with synchronized switching to avoid beat frequencies. Use Value: 2.4 MHz operation enables compact magnetics; POK signal ensures clean power-up sequencing before audio processing begins. | Use Scenario: Powers SoC, display controllers, and USB hubs in modern automotive infotainment platforms requiring low-noise, high-reliability power. IC Role / Device Role / Timing Role: High-current buck controller managing core voltage rail with sleep mode for low-power states (e.g., key-off memory retention). Use Value: <5 µA sleep current extends battery life; AEC-Q100 qualification ensures robustness against automotive thermal and vibration stress. |
| Telematics Control Unit (TCU) Input Stage | ADAS Camera Module Power |
Use Scenario: Regulates 12 V battery input to 5 V or 3.3 V for cellular modems, GNSS receivers, and CAN interfaces in TCUs. IC Role / Device Role / Timing Role: Wide-input buck converter handling cold-crank (3.6 V) and load-dump (40 V) transients while maintaining regulation. Use Value: Withstands 40 V surge; UVLO hysteresis (400 mV) prevents oscillation during slow battery recovery. | Use Scenario: Provides stable 1.8 V or 1.2 V rail to image sensors and ISP processors in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Precision-regulated buck stage with ±1.0% accuracy ensuring consistent sensor performance across temperature. Use Value: External compensation allows tuning for low-ESR ceramic capacitors; POK confirms rail readiness before sensor initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A8586KEJTR-T | Successor device with improved efficiency, lower quiescent current (1.5 µA sleep), and extended frequency range (up to 4 MHz) | Designed for new designs targeting higher density and lower EMI; not pin-compatible with ARG81801KESJSR | Select for new designs requiring longer product lifecycle support and enhanced thermal performance |
| MPQ4420AGL-A | 3 A synchronous buck with integrated high/low MOSFETs; 3.3–36 V input; no POK or SYNC pin | Lacks sleep mode deep-shutdown and external sync; requires different compensation and layout | Consider where synchronous rectification improves light-load efficiency but POK/SYNC are noncritical |
Compared with A8586KEJTR-T and MPQ4420AGL-A, ARG81801KESJSR offers unique AEC-Q100-compliant sleep-mode current <5 µA and dedicated POK/external SYNC functionality-critical for legacy automotive infotainment platforms still in production.
Availability
ARG81801KESJSR is available at Aetrix Electronics and suitable for car audio systems, infotainment head units, and telematics control units requiring stable component supply amid obsolescence transition planning.
Supply support for ARG81801KESJSR 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
Allegro MicroSystems is a U.S.-based semiconductor company specializing in high-performance power ICs and magnetic sensing solutions for automotive and industrial markets.
The ARG81801KESJSR belongs to Allegro's automotive power management product line, engineered specifically to meet the demanding voltage, thermal, and reliability requirements of next-generation car audio and infotainment systems.
FAQ
What is the maximum input voltage rating for ARG81801KESJSR?
The ARG81801KESJSR has an absolute maximum input voltage rating of 40 V, enabling it to withstand automotive load-dump transients. Its operational input range is specified from 4.0 V to 35 V, with UVLO activation at 3.6 V (rising) and dropout recovery down to 3.6 V (falling). This makes ARG81801KESJSR suitable for 12 V and 24 V vehicle electrical systems.
Does ARG81801KESJSR support pre-biased startup?
Yes, ARG81801KESJSR supports pre-biased startup, meaning it can safely begin regulation even when the output capacitor is already charged to a non-zero voltage. This prevents reverse current flow and avoids system resets during hot-plug or multi-rail sequencing scenarios - a critical feature for reliable operation in automotive infotainment systems using ARG81801KESJSR.
What is the purpose of the POK pin on ARG81801KESJSR?
The POK (Power OK) pin on ARG81801KESJSR is an open-drain output that transitions to high-impedance state only after the output voltage has remained within regulation (VFB ≥ 880 mV) for a minimum delay of 19–41 µs. This provides a deterministic, glitch-free signal for downstream microcontrollers or PMICs to confirm stable power delivery before enabling dependent circuitry - a key function in systems built around ARG81801KESJSR.
How does the SLEEP pin function on ARG81801KESJSR?
The SLEEP pin on ARG81801KESJSR commands ultralow-power shutdown: pulling it below 0.5 V (with 103 µs delay) disables switching and reduces total input current to <5 µA at 85°C. When high (>1.3 V), ARG81801KESJSR operates normally. The pin tolerates up to 40 V, allowing direct connection to VIN if no logic-level wake signal is available - essential for always-on automotive subsystems using ARG81801KESJSR.
Is ARG81801KESJSR pin-compatible with the A8586KEJTR-T?
No, ARG81801KESJSR is not pin-compatible with the A8586KEJTR-T. While both are Allegro automotive buck regulators, A8586KEJTR-T uses a different pinout, lacks the TEST pin, and integrates updated protection logic and compensation architecture. Migration requires PCB redesign. ARG81801KESJSR remains supported for existing customer transition until the July 31, 2024 last-time-buy deadline.
ARG81801KESJSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- 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):
- 35V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 3A
- Frequency - Switching:
- 250kHz ~ 2.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
ARG81801KESJSR FAQ
1.How can I place an order for ARG81801KESJSR through Aetrix?
Please submit a Request for Quotation (RFQ) for ARG81801KESJSR 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 ARG81801KESJSR reliable?
The price and inventory of ARG81801KESJSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ARG81801KESJSR is usually 5 days.
3.What payment methods are accepted for ARG81801KESJSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ARG81801KESJSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ARG81801KESJSR?
ARG81801KESJSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ARG81801KESJSR 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 ARG81801KESJSR?
For technical support, including ARG81801KESJSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ARG81801KESJSR requirements.
6.How does Aetrix verify that ARG81801KESJSR is sourced from the original manufacturer or authorized distributors?
All ARG81801KESJSR 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 ARG81801KESJSR meets industry standards.
7.What is the process for return or replacement of ARG81801KESJSR?
All ARG81801KESJSR units undergo pre-shipment inspection (PSI). If there is an issue with ARG81801KESJSR, 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 ARG81801KESJSR part is unused and in its original packaging.
Return procedure for ARG81801KESJSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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