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Allegro MicroSystems A8483EEKTR-T
- Part No.:
- A8483EEKTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 5-WDFN Exposed Pad
- Datasheet:
-
A8483EEKTR-T.pdf
- Description:
- IC REG BOOST ADJ 350MA 5TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,046
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Product details
Overview
A8483EEKTR-T from Allegro MicroSystems is a current-mode, 1.2 MHz step-up DC-DC converter in a 5-pin 3 mm × 3 mm thermally enhanced TDFN package. It delivers up to 35 V output from 2.5–10 V input, features 350 mA internal switch current limit, 615 mV feedback reference, and 1 μA shutdown current. It is designed for OLED bias and WLED backlighting in portable battery-powered devices.
For engineers reviewing the A8483EEKTR-T datasheet, A8483EEKTR-T pinout, A8483EEKTR-T application, or A8483EEKTR-T equivalent, key selection criteria include output voltage programmability via FB divider, low-noise PWM/analog dimming capability, thermal performance on 4-layer PCB (RθJA = 50 °C/W), and compatibility with small-footprint 10 µH inductors and Schottky diodes.
Technical Context
The A8483EEKTR-T employs constant-frequency current-mode control with an internal 1.2 MHz oscillator and integrated 36 V/350 mA N-channel MOSFET switch. Its feedback loop uses a precise 615 mV internal reference to regulate either output voltage (OLED) or load current (WLED) via external resistor networks.
It supports dual-input operation: primary VIN (2.5–10 V) and optional VSUPPLY (0.9–18 V) for bias supply independence. Soft-start is implemented externally via FB pin control, and dimming is achieved through analog voltage or PWM signal injection at the FB pin - not via dedicated dimming pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz typical; enables compact LC filter design and reduces audible noise in display applications. |
| Output Voltage Range | Up to 35 V; programmable via FB resistor divider for OLED bias or WLED current sense. |
| Input Voltage Range | 2.5 V to 10 V (VIN); extends to 0.9–18 V with separate VSUPPLY bias rail. |
| Feedback Reference | 615 mV ±25 mV; sets regulation point for precision output voltage or current control. |
| Switch Current Limit | 350 mA; defines maximum inductor peak current and short-circuit protection threshold. |
| Shutdown Current | 1 μA max; enables ultra-low power-off state for battery longevity in portable systems. |
| Operating Temperature | –40°C to +85°C ambient; validated for consumer handheld and automotive infotainment display modules. |
Pinout & Package
Package: 5-pin TDFN (suffix EK), 3 mm × 3 mm × 0.75 mm, thermally enhanced with exposed pad. Compatible with SOT23-5 footprint layout per JEDEC MO-229 WEEA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Internal power FET drain | Switch node connecting inductor and diode; requires minimal trace length and proximity to L1/D1 to reduce EMI. |
| 2 - GND | Power and signal ground | Primary return path; must connect directly to ground plane and serve as Kelvin reference for FB resistor. |
| 3 - FB | Feedback input | Senses divided output voltage or current-sense voltage; 615 mV reference enables dimming via analog/PWM injection. |
| 4 - EN | Enable control input | Logic-level enable: <0.4 V disables (1 μA shutdown), >1.5 V enables; no internal pull-up/down. |
| 5 - VIN | Main supply input | Power for control circuitry; requires local 1 µF ceramic bypass capacitor placed near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 36 V / 350 mA switch | Eliminates external MOSFET, reducing BOM count and PCB area in space-constrained display modules. |
| 1.2 MHz fixed-frequency operation | Enables use of small 10 µH inductors (e.g., Toko 1098AS-100M) and sub-1 µF ceramic output capacitors. |
| Low-noise dimming interface | FB pin accepts analog voltage or 10 kHz PWM signal - no dedicated dimming pin required. |
| Separate VSUPPLY bias option | Allows operation with input as low as 0.9 V when powered by external 3.3 V or 5 V rail or Zener. |
| Thermally enhanced TDFN package | RθJA = 50 °C/W on 4-layer board supports 15–40 mA output loads without heatsinking. |
Applications
| OLED Bias Supply | WLED Backlighting |
|---|---|
|
Use Scenario: Powering monochrome or color OLED displays in smartphones and MP3 players using single-cell Li-ion (2.5–5.5 V). IC Role / Device Role / Timing Role: Step-up converter regulating 12–32 V bias voltage via FB divider; provides stable high-impedance output for pixel voltage control. Use Value: Enables full brightness control across battery discharge range while maintaining <1% output voltage drift over temperature. |
Use Scenario: Driving white LED strings in portable media players and digital cameras with analog or PWM dimming. IC Role / Device Role / Timing Role: Constant-current source where FB senses voltage across R1 to set ILOAD = 0.615 V / R1. Use Value: Achieves <±3% current accuracy across 0–100% dimming range without external op-amps or DACs. |
| LCD Panel Bias (±12 V) | Varactor Diode Bias |
|
Use Scenario: Generating dual-rail ±12 V supplies for small LCD panels in PDAs and camcorders from 2.5–5.5 V input. IC Role / Device Role / Timing Role: Positive rail generator with external charge-pump stage; FB regulates +12 V, negative rail derived via capacitor coupling. Use Value: Delivers combined 15 mA (IOUT1 + IOUT2) with <2% cross-regulation error between rails. |
Use Scenario: Providing tunable 25–32 V bias for varactor diodes in FED displays and plasma TV tuning circuits. IC Role / Device Role / Timing Role: Precision high-voltage source with adjustable output via R1/R2 divider; supports 18–80 mA load depending on input voltage. Use Value: Maintains <0.5% line regulation from 5 V to 12 V input and <1% load regulation up to 80 mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17062ETA+T | Fixed 1.2 MHz frequency, 36 V switch, but requires external compensation and lacks VSUPPLY bias option. | Supports OLED bias but no native WLED current-mode control; dimming requires external DAC. | Choose when needing higher output current (500 mA) and tighter output voltage tolerance (±0.5%), but accept added design complexity. |
| TPS61042DRVR | 1.3 MHz switching, 28 V switch, 0.75 μA shutdown, but only 2.5–6 V input range and no separate VSUPPLY pin. | Valid for WLED backlighting below 28 V, but unsuitable for 32 V varactor bias or low-VIN (<2.5 V) operation. | Choose for cost-sensitive, lower-voltage portable designs where 28 V max output suffices and thermal constraints are less stringent. |
Compared with A8483EEKTR-T, MAX17062ETA+T offers higher current drive but demands more external components, while TPS61042DRVR trades voltage headroom and bias flexibility for lower quiescent current and smaller solution size - neither matches the A8483EEKTR-T's combination of 35 V output, 0.9 V minimum effective input (with VSUPPLY), and integrated dimming interface.
Availability
A8483EEKTR-T is available at Aetrix Electronics and suitable for OLED bias supply, WLED backlighting, LCD panel bias, and varactor diode bias applications requiring stable component supply and long-term design continuity.
Supply support for A8483EEKTR-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 designer of high-performance power ICs and magnetic sensors, headquartered in Worcester, Massachusetts.
The A8483 product line targets display power management, specifically addressing the need for compact, low-noise, dimmable step-up converters in battery-powered portable electronics.
FAQ
What is the maximum output voltage supported by the A8483EEKTR-T?
The A8483EEKTR-T supports output voltages up to 35 V, as confirmed by its absolute maximum SW pin rating of 36 V and validated operation at 32 V in LCD TV and varactor diode bias applications. Output voltage is set externally via the FB resistor divider using the 615 mV internal reference, enabling precise configuration for OLED, WLED, or high-voltage analog bias needs.
Can the A8483EEKTR-T operate from a 1.8 V input source?
No - the A8483EEKTR-T requires a minimum 2.5 V on the VIN pin for normal operation. However, it can function with as low as 0.9 V input when using the separate VSUPPLY pin powered by an external 3.3 V or 5 V rail or Zener diode, as documented in Figures 2 and 19 of the datasheet.
Does the A8483EEKTR-T support true constant-current regulation for WLED strings?
Yes - the A8483EEKTR-T regulates WLED current by sensing voltage across an external sense resistor (R1) connected to the FB pin. With the internal 615 mV reference, ILOAD = 0.615 V / R1, enabling accurate constant-current operation without additional ICs, as shown in Figure 8 and Equation (2) of the datasheet.
What thermal performance can be expected from the A8483EEKTR-T in a standard 4-layer PCB layout?
On a standard 4-layer PCB, the A8483EEKTR-T achieves RθJA = 50 °C/W, allowing continuous operation at up to 40 mA output current with 32 V output and 5 V input without forced airflow or heatsinking - verified in thermal characterization data and Figure 19 load regulation plots.
Is the A8483EEKTR-T pin-compatible with other Allegro boost converters like the A8482?
No - the A8483EEKTR-T is not pin-compatible with A8482 or other Allegro boost converters. Its 5-pin TDFN (EK) package and pinout (SW/GND/FB/EN/VIN) are unique to this family; A8482 uses different pin assignment and package type, and no documentation states pin compatibility between them.
A8483EEKTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 5-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 0.615V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 350mA (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TDFN (3x3)
A8483EEKTR-T FAQ
1.How can I place an order for A8483EEKTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8483EEKTR-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 A8483EEKTR-T reliable?
The price and inventory of A8483EEKTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8483EEKTR-T is usually 5 days.
3.What payment methods are accepted for A8483EEKTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8483EEKTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8483EEKTR-T?
A8483EEKTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8483EEKTR-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 A8483EEKTR-T?
For technical support, including A8483EEKTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8483EEKTR-T requirements.
6.How does Aetrix verify that A8483EEKTR-T is sourced from the original manufacturer or authorized distributors?
All A8483EEKTR-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 A8483EEKTR-T meets industry standards.
7.What is the process for return or replacement of A8483EEKTR-T?
All A8483EEKTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8483EEKTR-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 A8483EEKTR-T part is unused and in its original packaging.
Return procedure for A8483EEKTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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