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Allegro MicroSystems A8483EEK-T
- Part No.:
- A8483EEK-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 5-WDFN Exposed Pad
- Datasheet:
-
A8483EEK-T.pdf
- Description:
- IC REG BOOST ADJ 350MA 5TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,361
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Product details
Overview
A8483EEK-T from Allegro MicroSystems is a current-mode step-up DC-DC converter in a 3 mm × 3 mm TDFN package, delivering up to 35 V output from 2.5–10 V input, with 1.2 MHz fixed switching frequency, 350 mA switch current limit, and 1 μA shutdown current - designed for OLED bias and WLED backlighting in portable battery-powered devices.
For engineers reviewing the A8483EEK-T datasheet, A8483EEK-T pinout, A8483EEK-T application, or A8483EEK-T equivalent, key selection criteria include feedback reference voltage (615 mV), thermal performance (RθJA = 50 °C/W), soft-start capability via FB pin control, and compatibility with low-ESR ceramic capacitors and 10 μH inductors in space-constrained display power designs.
Technical Context
The A8483EEK-T employs constant-frequency current-mode PWM control with internal 1.2 MHz oscillator and 615 mV feedback reference, enabling precise regulation of output voltage (OLED) or current (WLED) via external resistor dividers or sense resistors. Its low-side N-channel MOSFET switch integrates a 36 V rating and 350 mA current limit.
Operation supports discontinuous conduction mode at light loads, maintaining regulation down to zero load current while exhibiting low-frequency SW-pin ringing - damped optionally but not recommended due to efficiency loss. Dimming is implemented via analog voltage or PWM signal applied through the FB pin, with dedicated soft-start circuits using RC networks on FB for controlled output ramp-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz typical; enables compact magnetics and low EMI in portable displays. |
| Feedback Reference Voltage | 615 mV ±25 mV; sets output voltage or current via external resistor network. |
| Input Voltage Range | 2.5 V to 10 V; supports single-cell Li-ion (2.7–4.2 V) and dual-cell alkaline inputs. |
| Output Voltage Range | Up to 35 V; sufficient for OLED anode bias and high-voltage WLED strings. |
| Switch Current Limit | 350 mA; defines maximum inductor peak current and short-circuit robustness. |
| Shutdown Current | 1 μA max; minimizes battery drain during display off-state in portable systems. |
| Thermal Resistance | RθJA = 50 °C/W on 4-layer board; requires exposed thermal pad soldering for full power operation. |
Pinout & Package
Package: 5-pin thermally enhanced TDFN (3 mm × 3 mm, 0.75 mm height), leadframe plated with 100% matte tin, solder pad layout compatible with SOT23-5 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Low-side power switch drain | Connects to inductor and diode cathode; carries high di/dt; requires minimal PCB trace length and proximity to L1/D1. |
| 2 - GND | Power and signal ground reference | Must connect directly to ground plane; feedback resistor return must tie here separately to avoid noise coupling. |
| 3 - FB | Feedback input | Senses output voltage (OLED) or current (WLED); internal 615 mV reference; accepts analog dimming voltage or PWM-filtered signal. |
| 4 - EN | Enable control input | Logic-high (>1.5 V) enables operation; logic-low (<0.4 V) disables IC and reduces supply current to ≤1 μA. |
| 5 - VIN | Control circuit supply | Powers internal bias circuitry; requires 1 μF ceramic bypass capacitor placed close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 36 V, 350 mA switch | Eliminates external MOSFET and reduces BOM count in display bias supplies. |
| 1.2 MHz fixed-frequency PWM | Enables use of small 10 μH inductors (e.g., Toko 1098AS-100M) and sub-1 μF output capacitors. |
| Low-noise dimming interface | FB pin supports both analog voltage and 10 kHz PWM dimming without added ICs or filtering complexity. |
| Soft-start via FB pin | RC network on FB allows programmable output voltage ramp time, reducing inrush current into capacitive OLED loads. |
| Discontinuous mode operation | Maintains regulation down to zero load current while minimizing quiescent power in standby display states. |
Applications
| OLED Display Bias | WLED Backlighting |
|---|---|
Use Scenario: Powering anode voltage for monochrome or color OLED panels in smartphones and MP3 players using single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: Step-up converter regulating output voltage to 12–15 V via FB pin voltage divider; provides stable bias under dynamic pixel content changes. Use Value: Delivers 15 V at 15 mA from 2.7 V input with >80% efficiency; low 1.2 MHz ripple avoids visible display artifacts. | Use Scenario: Driving parallel WLED strings in portable media players and PDAs requiring adjustable brightness via PWM or analog control. IC Role / Device Role / Timing Role: Constant-current source configured via FB-connected sense resistor; dimming achieved by modulating FB pin voltage. Use Value: Sets LED current precisely (e.g., 20 mA per string) with 615 mV reference tolerance; supports 10 kHz PWM dimming without external driver IC. |
| LCD Panel Dual-Rail Supply | Varactor Diode Bias |
Use Scenario: Generating ±12 V rails from 3.3 V or 5 V supply for small LCD segment drivers in camcorders and GPS units. IC Role / Device Role / Timing Role: Positive rail generator with external charge-pump stage; uses same IC for both polarities via reconfigured feedback and diode routing. Use Value: Achieves ±12 V at total 15 mA with <100 mV load regulation; eliminates need for dual-output controller or discrete charge pump. | Use Scenario: Providing tunable high-voltage bias (25–32 V) for varactor diodes in FED displays and plasma TV tuning circuits. IC Role / Device Role / Timing Role: Precision voltage regulator with tight line/load regulation (±0.2 V over 5–12 V input range). Use Value: Maintains 32 V output within ±0.3 V across 0–40 mA load; supports fast tuning response with low output impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17065ETA+T | Fixed 1.2 MHz frequency, 36 V switch, but requires external compensation and lacks integrated soft-start on FB pin. | Supports similar OLED/WLED bias but needs additional RC network for dimming control. | Choose when design requires adjustable current limit or higher temperature rating (−40°C to +105°C). |
| TPS61042DRVR | 1.2 MHz operation, 28 V switch, 400 mA current limit, but only 2.5–6 V input range and no separate bias supply option. | Optimized for low-input-voltage WLED apps; cannot support 7–18 V bias supply configurations. | Prefer for cost-sensitive, single-cell-only designs where 35 V output headroom is not required. |
Compared with A8483EEK-T, MAX17065ETA+T offers wider temperature range but adds design complexity, while TPS61042DRVR delivers higher switch current at lower cost but sacrifices input flexibility and bias-supply versatility critical for multi-rail display systems.
Availability
A8483EEK-T is available at Aetrix Electronics and suitable for OLED bias supply, WLED backlighting, LCD panel dual-rail generation, and varactor diode bias applications requiring stable component supply and long-term design continuity.
Supply support for A8483EEK-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 and manufacturer of high-performance magnetic sensing and power IC solutions, headquartered in Worcester, Massachusetts.
The A8483 product line targets portable display power management, emphasizing integration, low-noise operation, and flexible dimming control for battery-constrained consumer electronics.
FAQ
What is the maximum output voltage supported by the A8483EEK-T?
The A8483EEK-T supports output voltages up to 35 V, verified in Allegro's datasheet (A8483-DS, Rev. 1, page 1). This headroom enables reliable biasing of OLED anodes and high-voltage WLED strings. The actual achievable output depends on external component selection - particularly inductor saturation current, diode reverse voltage rating, and output capacitor voltage rating - all of which must be rated ≥35 V for full-range operation. A8483EEK-T maintains regulation stability across this range when used with recommended 10 μH inductors and Schottky diodes.
Does the A8483EEK-T support both OLED voltage regulation and WLED current regulation?
Yes, the A8483EEK-T supports both modes via its FB pin architecture. For OLED bias, a resistor divider sets output voltage using the internal 615 mV reference (VOUT = 0.615 × (1 + R1/R2)). For WLED current regulation, a sense resistor (R1) is placed between FB and GND so that ILED = 0.615 / R1. This dual-mode capability is confirmed in Figures 7 and 8 of the A8483EEK-T datasheet and enables reuse of the same IC across different display technologies without hardware change.
What is the purpose of the VSUPPLY pin mentioned in some A8483EEK-T application schematics?
The A8483EEK-T does not have a VSUPPLY pin - this is a misattribution in certain reference diagrams. The device has only five pins: VIN, SW, EN, GND, and FB. In configurations requiring operation outside the 2.5–10 V VIN range (e.g., 0.9–18 V), a separate bias supply (often labeled VSUPPLY in app notes) powers the IC via VIN, while the main battery feeds the switch node indirectly. This external bias path is enabled by the device's ability to operate with VIN supplied independently - a feature explicitly documented in the "Features and Benefits" section of the A8483EEK-T datasheet.
Can the A8483EEK-T be used for negative voltage generation?
Yes, the A8483EEK-T can generate negative output voltages using an inverting buck-boost configuration, as demonstrated in Figure 2 of the A8483EEK-T datasheet for ±12 V LCD bias. In this setup, the SW pin drives an inductor-diode-capacitor network to produce a regulated negative rail referenced to GND. Output polarity reversal requires no IC modification - only reconfiguration of external components and feedback network. Load regulation remains within ±100 mV for combined ±12 V outputs at 7.5 mA each, per Figure 17.
Is the A8483EEK-T still in active production and supported for new designs?
The A8483EEK-T is classified as Pre-End of Life as of June 3, 2013, with Last Time Buy expected within a minimum of six months from that date. While Allegro continues to fulfill existing orders, new designs should consider migration paths. The datasheet confirms ongoing production status at time of publication, and Aetrix Electronics maintains legacy inventory with full traceability. Customers developing new products are advised to consult Allegro's sales team for recommended substitutions such as the A8483EEK-T's functional successors or pin-compatible alternatives before committing to long-term BOMs.
A8483EEK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 5-WDFN Exposed Pad
- Packaging:
- Tube
- 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)
A8483EEK-T FAQ
1.How can I place an order for A8483EEK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8483EEK-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 A8483EEK-T reliable?
The price and inventory of A8483EEK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8483EEK-T is usually 5 days.
3.What payment methods are accepted for A8483EEK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8483EEK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8483EEK-T?
A8483EEK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8483EEK-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 A8483EEK-T?
For technical support, including A8483EEK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8483EEK-T requirements.
6.How does Aetrix verify that A8483EEK-T is sourced from the original manufacturer or authorized distributors?
All A8483EEK-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 A8483EEK-T meets industry standards.
7.What is the process for return or replacement of A8483EEK-T?
All A8483EEK-T units undergo pre-shipment inspection (PSI). If there is an issue with A8483EEK-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 A8483EEK-T part is unused and in its original packaging.
Return procedure for A8483EEK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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