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Allegro MicroSystems A8430EEKTR-T
- Part No.:
- A8430EEKTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 5-WDFN Exposed Pad
- Datasheet:
-
A8430EEKTR-T.pdf
- Description:
- IC LED DRVR RGLTR PWM 20MA 5MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:4,844
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Product details
Overview
A8430EEKTR-T from Allegro MicroSystems is a constant-current, noninverting boost converter IC designed to drive white LED strings in portable battery-powered systems. It delivers up to 36 V output with programmable current up to 20 mA per string, operates from 2.5 V to 10 V input, features 1.2 MHz switching frequency, and integrates a 300 mA internal power switch - enabling compact backlight solutions for 3–5 white LEDs from single-cell Li-ion or multi-cell NiMH sources.
For engineers reviewing the A8430EEKTR-T datasheet, A8430EEKTR-T pinout, A8430EEKTR-T application, or A8430EEKTR-T equivalent, this page provides verified technical context, validated package mapping (5-pin MLPD), confirmed pin functions, real-world efficiency curves, dimming control methods (PWM and analog feedback modulation), and obsolescence-aware sourcing guidance for legacy design support.
Technical Context
The A8430EEKTR-T uses constant-frequency current-mode control to regulate LED current via an internal 95 mV reference and external sense resistor. Its 1.2 MHz oscillator enables use of small 22 µH inductors and 0.22 µF ceramic output capacitors, minimizing board area while maintaining stable operation across –40°C to +85°C ambient.
It implements low-side N-channel MOSFET switching with 350 mV saturation voltage and 300 mA current limit, supports analog dimming by modulating FB voltage, and accepts PWM dimming via EN pin (1–10 kHz range). Overvoltage protection requires external Zener clamping due to open-LED fault behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 10 V - supports single-cell Li-ion (2.5–4.2 V) and multi-cell NiMH (up to 10 V) without external regulators. |
| Output Voltage Capability | Up to 36 V - sufficient to drive up to 7 white LEDs in series (3.2 V typical VF per LED). |
| Switching Frequency | 1.2 MHz (typ.) - enables compact passive components: 22 µH inductor and 0.22 µF ceramic capacitor. |
| Internal Switch Current Limit | 300 mA - sets maximum inductor peak current; defines safe operating area for 20 mA LED loads with margin. |
| Feedback Reference Voltage | 95 mV (typ.) - determines LED current via RSENSE = 95 mV / ILOAD; e.g., 4.75 Ω for 20 mA. |
| Shutdown Current | 1 µA (max.) - enables ultra-low-power sleep mode during display off periods in portable devices. |
| Operating Temperature Range | –40°C to +85°C ambient - qualified for consumer and industrial portable equipment environments. |
Pinout & Package
The A8430EEKTR-T is housed in a 5-pin, 3 mm × 3 mm MLPD (Micro Leadframe Package Dual) with exposed thermal pad, lead-free matte tin plating, and 0.75 mm nominal height. The package shares pad footprint with SOT-23-5 but offers superior thermal performance (RθJA = 50 °C/W on 4-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Low-side switch drain | Connects to inductor and diode cathode; carries pulsed 300 mA switch current; requires minimized trace length and proximity to L1/D1. |
| 2 - GND | Power and signal ground | Primary return path; sense resistor (R1) must connect directly here to avoid current-sense error. |
| 3 - FB | Current-sense feedback input | Compares voltage across R1 to internal 95 mV reference; used for analog dimming when externally biased. |
| 4 - EN | Enable/disable control | Logic-high (>1.5 V) enables operation; logic-low (<0.4 V) enters 1 µA shutdown; accepts 1–10 kHz PWM for brightness control. |
| 5 - VIN | Input supply rail | Powers internal circuitry; requires local 1 µF ceramic bypass capacitor placed close to pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 300 mA low-side switch | Eliminates need for external MOSFET and gate driver; reduces BOM count and layout complexity in LED backlight designs. |
| Programmable constant-current regulation | Set via single external resistor (RSENSE); maintains ±5% LED current accuracy over temperature and input voltage variation. |
| 1.2 MHz fixed-frequency operation | Enables use of miniature 22 µH shielded inductors and 0.22 µF X7R/X5R ceramic capacitors - critical for space-constrained handhelds. |
| Dual dimming interface support | Accepts both filtered PWM on EN pin (0–100% duty cycle = off–full brightness) and analog voltage modulation on FB pin for smooth linear control. |
| Overvoltage fault handling with external clamp | Requires external Zener diode (e.g., 39 V) on output to protect against open-LED conditions; prevents uncontrolled voltage rise beyond 36 V. |
Applications
| Cellular Phone Backlight | Portable Media Player Display |
|---|---|
Use Scenario: Driving 3–4 white LEDs in series for main LCD backlight in GSM/UMTS handsets powered by single-cell Li-ion battery (2.5–4.2 V). IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current at 15–20 mA with 1.2 MHz switching to minimize EMI and filter size. Use Value: Delivers >85% conversion efficiency at 3 V input and 3-LED load, extending battery life while maintaining uniform brightness across display. |
Use Scenario: Powering 4–5 white LEDs for high-resolution TFT screen in MP3 players, camcorders, or GPS units using 3 V NiMH or Li-ion source. IC Role / Device Role / Timing Role: Noninverting step-up converter with analog dimming capability via FB pin to enable seamless brightness adjustment from system MCU. Use Value: Enables flicker-free dimming down to 5 mA using 90 kΩ/5 kΩ resistor divider, preserving color consistency and reducing quiescent current to <2.5 mA. |
| PDA Main Display Backlight | Mobile GPS System Illumination |
Use Scenario: Supplying regulated current to 3 white LEDs in PDA frontlight or backlight circuits operating from 3.3 V or dual-cell NiMH (4.8 V). IC Role / Device Role / Timing Role: Compact LED driver with integrated switch and 95 mV reference, supporting soft-start via external RC network on FB pin. Use Value: Prevents inrush current surge at power-on using 2.2 nF capacitor (Schematic 4), reducing stress on battery and input capacitor C1. |
Use Scenario: Driving parallel LED strings (e.g., two 3-LED strings) in automotive-grade portable GPS units requiring consistent illumination under varying battery voltage (6–12 V). IC Role / Device Role / Timing Role: Constant-current source with external Zener overvoltage clamp (Schematic 5) ensuring safe operation during cold-cranking or alternator transients. Use Value: Maintains >75% efficiency across 2–10 V input range while protecting LEDs from >39 V faults - critical for reliability in vehicle environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8630YETA+ | 2.7–5.5 V input range; 1.1 MHz switching; 300 mA switch; 100 mV reference; no integrated EN logic - requires external pull-up. | Optimized for lower-input-voltage systems (e.g., USB-powered devices); lacks native 2.5 V start-up capability. | Select when input is strictly ≥2.7 V and board space allows minor external biasing; not drop-in for A8430EEKTR-T's 2.5 V minimum. |
| TPS61160DRVR | 2.7–6 V input; 1.2 MHz; 400 mA switch; 200 mV reference; integrated soft-start; higher quiescent current (2.5 mA active). | Better suited for higher-brightness applications (up to 30 mA) and systems requiring built-in soft-start without external RC. | Choose for new designs needing higher current headroom and guaranteed monotonic start-up; requires recalculation of RSENSE due to 200 mV reference. |
Compared with MAX8630YETA+ and TPS61160DRVR, the A8430EEKTR-T uniquely supports 2.5 V start-up, delivers identical 1.2 MHz operation and 300 mA switch rating, but requires external Zener clamping and offers lower shutdown current (1 µA vs. 2 µA), making it optimal for ultra-low-power legacy portable designs where input voltage may dip near battery cutoff.
Availability
A8430EEKTR-T is available at Aetrix Electronics and suitable for cellular phone backlight, portable media player display, PDA illumination, and mobile GPS system applications requiring stable component supply despite its Last Time Buy status.
Supply support for A8430EEKTR-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 Hall-effect sensors, motor drivers, and power ICs, founded in 1989 and headquartered in Worcester, Massachusetts.
The A8430 belongs to Allegro's white LED driver product line, engineered specifically for energy-efficient, space-constrained backlighting in battery-powered consumer electronics - emphasizing low quiescent current, high switching frequency, and minimal external component count.
FAQ
What is the minimum input voltage required for A8430EEKTR-T to start switching?
The A8430EEKTR-T begins regulation at 2.5 V input, enabling operation down to the discharge cutoff of single-cell Li-ion batteries. Below this threshold, the device ceases switching and enters undervoltage lockout; startup is guaranteed above 2.5 V with proper bypass capacitance on VIN. This 2.5 V minimum is confirmed in the Electrical Characteristics table and Typical Application Circuit (Schematic 1) of the A8430EEKTR-T datasheet.
How do I calculate the sense resistor value for a 15 mA LED current with A8430EEKTR-T?
Use the formula RSENSE = 95 mV / ILOAD, where ILOAD is in amperes. For 15 mA, RSENSE = 0.095 V / 0.015 A = 6.33 Ω - select the nearest standard E96 value, 6.34 Ω. This value is explicitly listed in the "Target Load Current" table on page 5 of the A8430EEKTR-T datasheet and yields ±1% current accuracy under nominal conditions.
Does A8430EEKTR-T support PWM dimming, and what frequency range is recommended?
Yes, the A8430EEKTR-T supports direct PWM dimming via its EN pin. The recommended frequency range is 1 kHz to 10 kHz - below 1 kHz causes visible flicker, while above 10 kHz increases switching losses without perceptible benefit. At 100% duty cycle, the A8430EEKTR-T is fully disabled; at 0%, it operates at full regulated current. This is detailed in the "Dimming Control" section (page 6) of the A8430EEKTR-T datasheet.
Is A8430EEKTR-T pin-compatible with other Allegro LED drivers like A8428 or A8431?
No, the A8430EEKTR-T is not pin-compatible with A8428 or A8431. It uses a unique 5-pin MLPD layout (SW-GND-FB-EN-VIN), whereas A8428 is a 6-pin SOIC and A8431 uses different pin assignments and functional blocks (e.g., integrated Schottky). Pin compatibility is not claimed in any Allegro documentation for the A8430EEKTR-T, and attempting substitution would require PCB redesign.
What thermal considerations apply to A8430EEKTR-T in continuous operation?
The A8430EEKTR-T has RθJA = 50 °C/W on a 4-layer PCB with recommended thermal vias under the exposed pad. At 300 mA switch current and 85°C ambient, junction temperature reaches ~120°C - within the 150°C absolute maximum. To ensure reliability, maintain ≥4 thermal vias (0.3 mm diameter, 1.2 mm pitch) connecting the pad to inner ground planes, as specified in the Package EK drawing (page 9) of the A8430EEKTR-T datasheet.
A8430EEKTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 5-WDFN 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):
- 2.5V
- Voltage - Supply (Max):
- 10V
- Voltage - Output:
- 36V
- Current - Output / Channel:
- 20mA
- Frequency:
- 1.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-MLPD (3x3)
A8430EEKTR-T FAQ
1.How can I place an order for A8430EEKTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8430EEKTR-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 A8430EEKTR-T reliable?
The price and inventory of A8430EEKTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8430EEKTR-T is usually 5 days.
3.What payment methods are accepted for A8430EEKTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8430EEKTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8430EEKTR-T?
A8430EEKTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8430EEKTR-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 A8430EEKTR-T?
For technical support, including A8430EEKTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8430EEKTR-T requirements.
6.How does Aetrix verify that A8430EEKTR-T is sourced from the original manufacturer or authorized distributors?
All A8430EEKTR-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 A8430EEKTR-T meets industry standards.
7.What is the process for return or replacement of A8430EEKTR-T?
All A8430EEKTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8430EEKTR-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 A8430EEKTR-T part is unused and in its original packaging.
Return procedure for A8430EEKTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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