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Allegro MicroSystems A8480EEJTR-T
- Part No.:
- A8480EEJTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
A8480EEJTR-T.pdf
- Description:
- IC LED DRIVER RGLTR 1.5A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,131
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Product details
Overview
A8480EEJTR-T from Allegro MicroSystems is a 1.2 MHz boost regulator IC with integrated 1.5 A DMOS switch, output disconnect capability, and internal compensation-designed for WLED flash/torch, OLED bias, and LCD display bias applications. It operates from 2.7–9 V input (1–2 Li-ion), delivers up to 23 V output, and features 1 μA shutdown current and overvoltage/overtemperature protection.
For engineers reviewing the A8480EEJTR-T datasheet, A8480EEJTR-T pinout, A8480EEJTR-T application, or A8480EEJTR-T equivalent, this page provides verified technical context, package-specific pin mapping, real-world efficiency curves, dual-OLED drive topology support, and validated alternative options for legacy design continuity.
Technical Context
The A8480EEJTR-T implements constant-frequency (1.2 MHz), current-mode control with soft-start and internal compensation-eliminating external loop components. Its dual-switch architecture includes S1 (1.5 A main boost FET) and S2 (80 mA disconnect FET), enabling true output disconnection during shutdown to suppress system leakage.
Feedback is regulated via FB1 (600 mV reference) for OUT1 voltage control, while FBADJ provides open-collector dimming interface driven by DIM logic input. The EJ package's exposed thermal pad and 45 °C/W θJA enable stable operation at 85°C ambient in compact display power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7–9 V: Supports single- or dual-cell Li-ion battery input without external regulation. |
| Switching Frequency | 1.2 MHz (typ): Enables use of small 4.7–22 μH inductors and ceramic capacitors for space-constrained displays. |
| Max Output Voltage | 23 V: Sufficient to drive up to 10-series WLEDs or high-voltage OLED bias rails. |
| Switch Current Limit | 1.5 A: Sets maximum inductor peak current, defining max output power under boost conditions. |
| Shutdown Current | 1 μA: Achieved via output disconnect switch, minimizing battery drain in standby mode. |
| Thermal Shutdown | 160°C (with 10°C hysteresis): Protects against sustained overload or poor PCB thermal design. |
| Feedback Reference | 600 mV (584–636 mV): Precision reference enables accurate output voltage setting via resistor divider. |
Pinout & Package
Package: 10-pin MLP/DFN (3 mm × 3 mm, 0.75 mm height) with exposed thermal pad (PAD). Designed for high thermal performance on 4-layer PCBs (θJA = 45 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power ground | Low-impedance return path for high-current switch node; must connect directly to thermal pad and ground plane. |
| 2 (B2 / FB) | Feedback input | Senses OUT1 voltage via resistor divider; 600 mV reference sets output regulation point. |
| 3 (B1 / ON1) | OUT1 enable | Active-high logic input controlling internal disconnect switch for OLED/WLED bias rail. |
| 4 (C1 / FBADJ) | Dimming output | Open-collector MOSFET output driven by DIM; used for analog dimming or secondary OLED control. |
| 5 (C2 / DIM) | Dimming control | Logic input that pulls FBADJ low when high; enables PWM or analog dimming via external circuitry. |
| 6 (C3 / OUT1) | OLED bias output | Regulated high-voltage output; internally disconnected from CAP during shutdown. |
| 7 (A1 / GND) | Signal ground | Reference for feedback and logic inputs; separate from PGND but tied to same ground plane. |
| 8 (B3 / SW) | Switch node | Connection to external inductor; carries high di/dt; requires minimal trace length and proximity to L1/D1. |
| 9 (A2 / VIN) | Battery input | Main power input (2.7–9 V); requires local 1 μF bypass capacitor to PGND. |
| 10 (A3 / CAP) | Boost capacitor node | Output of boost stage; connects to output capacitor and feeds OUT1 via internal switch. |
Key Features
| Feature | Design Value |
|---|---|
| Output disconnect during shutdown | Eliminates leakage path from CAP to OUT1, reducing system standby current to ≤1 μA. |
| Integrated 1.5 A DMOS switch | Enables single-chip boost conversion up to 23 V without external high-voltage FETs. |
| Dual-output OLED drive capability | Supports main OLED on OUT1 and sub-OLED between CAP and FBADJ using DIM-controlled switching. |
| Internal overvoltage and overtemperature protection | Automatically disables switching at 24.5–25.5 V CAP voltage or 160°C junction temperature. |
| 1.2 MHz fixed-frequency operation | Reduces EMI filtering requirements and allows miniaturized passive component selection. |
Applications
| WLED Flash/Torch | OLED Display Bias |
|---|---|
Use Scenario: Mobile phone rear camera flash delivering 100 mA pulsed current or 20 mA continuous torch mode. IC Role / Device Role / Timing Role: Boost regulator generating 18–20 V from 3.3 V battery to drive 5–10 series WLEDs with precise current control via external sense resistor. Use Value: Integrated disconnect switch prevents battery drain during idle; 1.2 MHz switching minimizes inductor size in thin handset designs. |
Use Scenario: AMOLED panel in smartwatch or portable infotainment requiring stable 12–18 V anode bias with dimming control. IC Role / Device Role / Timing Role: Constant-voltage bias supply with ON1 enable and DIM-driven FBADJ for analog brightness adjustment across full luminance range. Use Value: Dual-OLED configuration (main + sub) supported natively; thermal pad ensures reliability at 85°C ambient in sealed enclosures. |
| LCD Panel Bias Supply | General-Purpose Boost Converter |
Use Scenario: TFT-LCD source/gate driver requiring ±7.5 V and +15 V rails from single 5 V input in automotive cluster display. IC Role / Device Role / Timing Role: Primary boost stage generating VOUT at CAP; secondary charge-pump or inverting topologies derive negative/boosted rails using external diodes/caps. Use Value: High 23 V output headroom supports multi-rail generation; 1.5 A switch enables >500 mA total output current at 12 V. |
Use Scenario: Industrial sensor module needing isolated 12 V rail from 3.3 V microcontroller supply for analog front-end amplification. IC Role / Device Role / Timing Role: Standalone boost converter powered through CAP pin; configured for 12 V @ 520 mA output with 5.5 V input. Use Value: No external compensation required; soft-start prevents inrush into downstream LDOs or ADC references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17222ETA+T | 300 mA switch current, 5.5 V max output, no output disconnect FET | Only suitable for low-current WLED bias (<50 mA); cannot replace A8480EEJTR-T in flash or high-voltage OLED apps | Select only for space-constrained, low-power display bias where 23 V output and 1.5 A capability are unnecessary. |
| TPS61042DRBR | 1.2 A switch, 28 V max output, no integrated disconnect switch, 1.3 MHz switching | Lacks dedicated ON1/FBADJ pins for dual-OLED control; requires external MOSFET for output disconnection | Use when higher output voltage (28 V) is needed and board area permits adding external disconnect FET and gate driver. |
Compared with MAX17222ETA+T and TPS61042DRBR, the A8480EEJTR-T uniquely integrates both high-current boost switching (1.5 A) and true output disconnection (80 mA FET) in a single 10-pin MLP package-enabling compact, low-leakage WLED/OLED bias without external components.
Availability
A8480EEJTR-T is available at Aetrix Electronics and suitable for WLED flash drivers, OLED display bias supplies, LCD panel voltage rails, and general-purpose boost conversion requiring stable component supply for legacy design support and repair programs.
Supply support for A8480EEJTR-T 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, magnetic sensors, and motor driver solutions for automotive, industrial, and consumer markets.
The A8480 product line was designed specifically for compact, high-efficiency display power management-including WLED backlighting, flash/torch drivers, and OLED bias generation-with emphasis on integration, thermal robustness, and low-quiescent-current operation.
FAQ
What is the function of the FBADJ pin on the A8480EEJTR-T?
The FBADJ pin on the A8480EEJTR-T is an open-collector MOSFET output controlled by the DIM input. When DIM is high, FBADJ is pulled low, enabling external dimming circuits or driving a secondary OLED between CAP and FBADJ. Its on-resistance is typically 10 Ω, supporting up to ~60 mA sink current with <0.6 V drop at 50 mA.
Can the A8480EEJTR-T drive more than one OLED simultaneously?
Yes-the A8480EEJTR-T supports dual-OLED operation natively. The main OLED connects to OUT1 (controlled by ON1), while a sub-OLED connects between CAP and FBADJ. Driving DIM high activates the internal S3 switch, pulling FBADJ low and enabling the sub-OLED. This configuration is documented in Figure 6 of the A8480 datasheet.
What is the maximum output current the A8480EEJTR-T can deliver at 12 V output?
In general boost mode (power taken from CAP pin), the A8480EEJTR-T delivers up to 520 mA at 12 V with 5.5 V input, as specified in the "General purpose boost converter" application note. This assumes optimal layout, 4.7 μH inductor, and ceramic output capacitance-efficiency peaks near 90% at 200–300 mA load.
Does the A8480EEJTR-T require external compensation components?
No-the A8480EEJTR-T includes internal compensation optimized for 1.2 MHz current-mode operation. No external RC networks or compensation capacitors are needed. This simplifies design and improves stability across input/output voltage ranges, as confirmed in the Functional Block Diagram and Applications Information sections.
Is the A8480EEJTR-T still recommended for new designs?
No-the A8480EEJTR-T is a discontinued product. Allegro MicroSystems states it is "no longer in production" and "should not be purchased for new design applications." However, Aetrix Electronics maintains inventory for legacy support, repair, and end-of-life continuity programs with full traceability and lifecycle coordination.
A8480EEJTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 9V
- Voltage - Output:
- 23V
- Current - Output / Channel:
- 1.5A (Switch)
- Frequency:
- 1.2MHz
- Dimming:
- -
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
A8480EEJTR-T FAQ
1.How can I place an order for A8480EEJTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8480EEJTR-T 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 A8480EEJTR-T reliable?
The price and inventory of A8480EEJTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8480EEJTR-T is usually 5 days.
3.What payment methods are accepted for A8480EEJTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8480EEJTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8480EEJTR-T?
A8480EEJTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8480EEJTR-T 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 A8480EEJTR-T?
For technical support, including A8480EEJTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8480EEJTR-T requirements.
6.How does Aetrix verify that A8480EEJTR-T is sourced from the original manufacturer or authorized distributors?
All A8480EEJTR-T 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 A8480EEJTR-T meets industry standards.
7.What is the process for return or replacement of A8480EEJTR-T?
All A8480EEJTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8480EEJTR-T, 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 A8480EEJTR-T part is unused and in its original packaging.
Return procedure for A8480EEJTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A8480EEJTR-T Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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