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Allegro MicroSystems A8530EESTR-T
- Part No.:
- A8530EESTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
A8530EESTR-T.pdf
- Description:
- IC LED DRV RGLT MULTI-STEP 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
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Product details
Overview
A8530EESTR-T from Allegro MicroSystems is a 6-channel white LED driver IC with integrated fractional charge pump (1×, 1.5×, 2×), delivering 30 mA per channel for four display backlight LEDs and 100 mA per channel for two flash/torch LEDs, operating from 2.7–5.5 V input, used in mobile phone displays and camera flash modules.
For engineers reviewing the A8530EESTR-T datasheet, A8530EESTR-T pinout, A8530EESTR-T application, or A8530EESTR-T equivalent, key selection criteria include dual serial dimming control (ENM/ENF), ±0.5% LED current matching, 320 mA total output capability, thermal shutdown at 165°C, and 0.75 mm thin 3 mm × 3 mm QFN-16 package.
Technical Context
The A8530EESTR-T implements an adaptive fractional charge pump architecture that dynamically transitions between 1×, 1.5×, and 2× modes based on VIN and LED forward voltage-triggering mode shifts when VLEDx falls below 150 mV or dropout conditions arise. It uses internal current mirrors referenced to ISET bias (0.6 V) to regulate LED current with 220× scaling.
Dimming is implemented via two independent single-wire serial interfaces: ENM controls backlight LEDs (LED1–LED4) across 11 discrete levels (100% → 5%), while ENF controls flash LEDs (LED5–LED6) from 100 mA down to 5 mA in 10 mA steps. Both support absolute-level setting via tSHDN-reset pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7–5.5 V - supports full Li+ battery range without external regulation |
| Backlight Output Current | 30 mA per channel (LED1–LED4) - set by RSET resistor and 220× current mirror ratio |
| Flash Output Current | 100 mA per channel (LED5–LED6), default - adjustable via ENF serial pulses |
| LED Current Matching | ±0.5% typical - ensures uniform brightness across all six channels |
| Charge Pump Modes | 1×, 1.5×, 2× - adaptive switching maintains efficiency >85% across input range |
| Thermal Shutdown Threshold | 165°C - protects against sustained overtemperature in compact handheld layouts |
| Quiescent Current | 0.1 μA in shutdown - minimizes battery drain during display-off states |
Pinout & Package
Package: 3 mm × 3 mm, 0.75 mm nominal height, 16-pin QFN/MLP (ES suffix), exposed thermal pad (EP) connected to GND for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+, C1− | Charge pump capacitor terminals (C1) | Form first-stage flying capacitor network; require 1 μF X5R/X7R ceramic |
| C2+, C2− | Charge pump capacitor terminals (C2) | Form second-stage flying capacitor network; require 1 μF X5R/X7R ceramic |
| ENM | Backlight enable/dimming control input | Single-wire serial interface for LED1–LED4; resets dimming level on >0.5 ms low pulse |
| ENF | Flash/torch enable/dimming control input | Single-wire serial interface for LED5–LED6; independent of ENM timing and state |
| ISET | Current reference input | Accepts 0.6 V bias; sets backlight current via RSET = (0.6 V × 220) / ILEDx |
| LED1–LED4 | Backlight current sink outputs | Each sinks up to 30 mA; must be tied to VOUT if unused - never left floating |
| LED5–LED6 | Flash/torch current sink outputs | Each sinks up to 100 mA; internally defaulted; require ENF pulses for dimming |
| VIN | Main power supply input | Connects to 2.7–5.5 V source; feeds charge pump and internal circuitry |
| VOUT | Charge pump regulated output | Supplies anode side of all six LEDs; requires 4.7 μF ceramic capacitor to GND |
| GND | Ground reference | Common return path; EP pad must be soldered to GND plane for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent dimming interfaces | ENM and ENF each support 11-step serial control with absolute-level reset - eliminates need for I²C or PWM controllers |
| Adaptive fractional charge pump | Automatically selects 1×/1.5×/2× mode based on real-time VIN and LED voltage - sustains regulation without manual mode selection |
| High-precision current matching | ±0.5% matching across all six channels - enables consistent color and luminance in multi-LED arrays |
| Integrated protection suite | Short-circuit detection (VOUT < 1.2 V), overvoltage lockout (6 V), thermal shutdown (165°C), and LED disconnection sensing - reduces external component count |
| Ultra-thin QFN package | 0.75 mm height, 3 mm × 3 mm footprint - fits space-constrained mobile PCBs behind display modules |
Applications
| Mobile Phone Display Backlight | Digital Camera Flash/Torch |
|---|---|
|
Use Scenario: Driving four white LEDs behind an LCD or OLED display in smartphones and feature phones. IC Role / Device Role / Timing Role: Constant-current sink with adaptive voltage boosting - supplies regulated current while maintaining minimal input-to-output voltage differential. Use Value: Delivers uniform 30 mA per LED with ±0.5% matching, enabling consistent brightness and color point across the display area without external feedback loops. |
Use Scenario: Powering two high-brightness white LEDs for still-image capture flash or continuous video torch illumination. IC Role / Device Role / Timing Role: Dual-channel flash driver with independent serial dimming - provides precise 100 mA per LED with fast enable/disable and stepwise current reduction. Use Value: Supports 320 mA total output with soft-start and low EMI, meeting camera module requirements for rapid flash activation and minimal RF interference. |
| Portable Media Player UI Lighting | Tablet Front Panel Illumination |
|
Use Scenario: Illuminating status indicators, touch-sensitive buttons, or small auxiliary displays in portable media players. IC Role / Device Role / Timing Role: Low-power backlight controller - operates from single-cell Li+ and enters sub-1 μA shutdown when not active. Use Value: Enables long battery life via 0.1 μA shutdown current and efficient 1× mode operation at higher VIN, reducing heat generation in sealed enclosures. |
Use Scenario: Providing even front-panel lighting for tablets with larger display bezels requiring more than four LEDs. IC Role / Device Role / Timing Role: Scalable 6-channel driver - uses LED1–LED4 for primary backlight and LED5–LED6 for supplemental edge or logo lighting. Use Value: Allows unified dimming control across mixed LED groups using separate ENM/ENF lines - simplifies firmware logic versus multi-IC solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3648YFFR | Single 1.5×/2× charge pump; 4-channel backlight only (no flash); I²C interface; no ENF/ENM serial control | Lacks dedicated flash/torch control; requires microcontroller I²C stack instead of GPIO-based dimming | Choose LM3648YFFR only if system already uses I²C and flash functionality is handled externally |
| TPS61165DRVR | Boost converter topology; 1.2 MHz fixed frequency; analog + PWM dimming; no integrated flash channel control | Higher EMI due to inductive switching; requires external inductor; no native dual-dimming interface | Select TPS61165DRVR when higher output voltage (>6 V) or >30 mA per backlight channel is required |
Compared with LM3648YFFR and TPS61165DRVR, the A8530EESTR-T uniquely integrates both display backlight and flash/torch drivers with independent single-wire serial control in one ultra-thin QFN, eliminating external communication interfaces and passive components while maintaining ±0.5% current matching.
Availability
A8530EESTR-T is available at Aetrix Electronics and suitable for mobile phone display backlighting, digital camera flash modules, portable media player UI lighting, and tablet front panel illumination requiring stable component supply and long-term lifecycle continuity.
Supply support for A8530EESTR-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 designs high-performance magnetic sensors and power ICs for automotive, industrial, and consumer applications, with core expertise in precision analog and mixed-signal semiconductor solutions.
The A8530 product line delivers ultracompact, high-efficiency LED drivers optimized for space-constrained portable devices requiring simultaneous backlight and flash functionality with minimal external components.
FAQ
What is the maximum total output current supported by the A8530EESTR-T?
The A8530EESTR-T supports up to 320 mA total output current: 120 mA (4 × 30 mA) for display backlight LEDs (LED1–LED4) and 200 mA (2 × 100 mA) for flash/torch LEDs (LED5–LED6). This rating assumes proper thermal management via the exposed pad and recommended PCB layout per Allegro's application notes.
How does the A8530EESTR-T achieve LED current matching better than ±0.5%?
The A8530EESTR-T achieves ±0.5% typical LED current matching through matched internal current mirrors referenced to a stable 0.6 V ISET bias voltage and proprietary charge pump control that minimizes voltage droop across output channels. This matching is verified across temperature (–40°C to +85°C) and input voltage (2.7–5.5 V) ranges per the official datasheet.
Can unused LED pins on the A8530EESTR-T be left unconnected?
No - unused LED pins on the A8530EESTR-T (e.g., LED5 or LED6 if flash is not used) must be connected to VOUT. Leaving any LEDx pin open causes the IC to default to 2× mode operation and may compromise regulation stability. The datasheet explicitly prohibits floating LED pins to prevent unintended behavior.
What protection features are built into the A8530EESTR-T?
The A8530EESTR-T includes short-circuit protection (VOUT < 1.2 V triggers shutdown), overvoltage lockout (6 V max at VOUT), thermal shutdown (165°C junction limit), and LED disconnection detection (disables channel if LEDx voltage exceeds VOUT – 0.4 V or VIN – 0.4 V). All protections are fully integrated and require no external components.
Is the A8530EESTR-T compatible with ceramic capacitors only, or can tantalum be used?
The A8530EESTR-T is specified for use with X5R or X7R ceramic capacitors for CIN, COUT, C1, and C2 - per Allegro's design recommendations. Tantalum capacitors are not recommended due to higher ESR, potential instability under ripple current, and risk of failure during charge pump transients. Ceramic capacitors ensure optimal efficiency, low EMI, and reliable soft-start behavior.
A8530EESTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 30mA, 100mA (Flash)
- Frequency:
- 1MHz
- Dimming:
- Multi-Step
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN/MLP (3x3)
A8530EESTR-T FAQ
1.How can I place an order for A8530EESTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8530EESTR-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 A8530EESTR-T reliable?
The price and inventory of A8530EESTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8530EESTR-T is usually 5 days.
3.What payment methods are accepted for A8530EESTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8530EESTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8530EESTR-T?
A8530EESTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8530EESTR-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 A8530EESTR-T?
For technical support, including A8530EESTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8530EESTR-T requirements.
6.How does Aetrix verify that A8530EESTR-T is sourced from the original manufacturer or authorized distributors?
All A8530EESTR-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 A8530EESTR-T meets industry standards.
7.What is the process for return or replacement of A8530EESTR-T?
All A8530EESTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8530EESTR-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 A8530EESTR-T part is unused and in its original packaging.
Return procedure for A8530EESTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A8530EESTR-T Tags
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