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Analog Devices Inc./Maxim Integrated MAX8901AETA+TGA8
- Part No.:
- MAX8901AETA+TGA8
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
MAX8901AETA+TGA8.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
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Inventory:3,110
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Product details
Overview
MAX8901AETA+TGA8 from Maxim Integrated is a high-efficiency, fixed-frequency (750kHz) step-up DC-DC converter IC designed to drive 2–6 series white LEDs with constant current for LCD backlighting in portable devices. It features direct PWM dimming control, 2.6V–5.5V input range, up to 91% efficiency, and integrated WLED overvoltage protection (25V typ). Its primary circuit role is LED current regulation in battery-powered handheld displays.
For engineers reviewing the MAX8901AETA+TGA8 datasheet, MAX8901AETA+TGA8 pinout, MAX8901AETA+TGA8 application, or MAX8901AETA+TGA8 equivalent, key selection considerations include PWM dimming interface compatibility, 8-pin TDFN-EP package thermal performance, 0.01µA shutdown current, and validation of WLED string voltage compliance with 25V OVP threshold.
Technical Context
The MAX8901AETA+TGA8 implements a current-mode boost topology with internal 750kHz oscillator and n-channel MOSFET switch (RLX = 0.7Ω typ, ILIM = 0.7A). It regulates LED current via CS pin feedback, where VCS is held at 0.50V (typ) during full-scale operation, enabling precise current setting using an external sense resistor.
Its single ON pin serves dual functions: enable control and PWM brightness modulation. Startup employs internal soft-start (10ms typical), while protection includes input UVLO (2.53V), OVLO (6.3V), thermal shutdown (160°C), and latch-off WLED OVP (25V). No WLED current flows in shutdown if WLED forward voltage exceeds VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 5.5V - supports full 1-cell Li+/Li-Poly battery operation without external regulation. |
| Switching Frequency | 750kHz (typ) - enables use of small 22µH inductors and low-ESR ceramic capacitors for compact layout. |
| LED Current Accuracy | ±1.3% (typ, TA = +25°C) - ensures uniform brightness across multi-LED strings in display backlighting. |
| WLED OVP Threshold | 25V (typ) - protects against open-circuit or excessive string voltage; latches off until ON or VIN cycled. |
| Shutdown Current | 0.01µA (typ) - minimizes battery drain in standby mode for extended device sleep periods. |
| Efficiency | Up to 91% - maximizes runtime in power-constrained handheld applications like smartphones and PDAs. |
| Output Voltage Range | Up to 25V - accommodates 6-series WLED strings with typical VF ≈ 4.2V each (25.2V total). |
Pinout & Package
MAX8901AETA+TGA8 is housed in an 8-pin, 2mm × 2mm TDFN-EP package with exposed paddle (EP) for thermal dissipation. The EP must be soldered to a solid ground plane per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OVP | WLED overvoltage monitor input | Connects to output capacitor positive terminal; triggers latch-off if WLED voltage exceeds 25V. |
| 2 ON | Enable and PWM dimming control | High = enable + soft-start; PWM signal (30–500kHz) modulates LED current proportionally to duty cycle. |
| 3 IN | Main power supply input | Accepts 2.6–5.5V; bypassed with 1µF ceramic cap; includes 6.3V OVLO and 2.53V UVLO protection. |
| 4 LX | Boost inductor switching node | Drives external inductor; high-impedance in shutdown; peak current limited to 0.7A. |
| 5 PGND | Power ground return | Low-impedance path for inductor and diode currents; must connect directly to EP and system GND. |
| 6 GND | Analog reference ground | Reference for CS, COMP, and internal circuits; tied to EP and PGND at single point near CIN. |
| 7 COMP | Loop compensation node | Connects 0.022µF cap to GND; sets soft-start time (10ms) and stabilizes current regulation loop. |
| 8 CS | Current-sense input | Regulated to 0.50V (typ); RCS resistor value determines max LED current (e.g., 20Ω = 25mA). |
Key Features
| Feature | Design Value |
|---|---|
| Direct PWM dimming interface | ON pin accepts 30–500kHz PWM signals; LED current scales linearly with duty cycle - eliminates need for external dimming controllers. |
| Integrated WLED overvoltage protection | 25V threshold with latch-off behavior prevents damage during open-string faults - no external sensing or reset circuitry required. |
| Ultra-low shutdown current | 0.01µA typical - extends battery life in always-on portable devices by minimizing quiescent drain during display-off states. |
| Internal soft-start | 10ms controlled ramp-up of LED current - eliminates inrush stress on LEDs, diodes, and input capacitors during power-on. |
| Thermal shutdown protection | 160°C junction limit with automatic recovery only after ON toggle or VIN cycle - prevents permanent die damage under sustained overload. |
Applications
| Smartphone LCD Backlight | Tablet Display Backlight |
|---|---|
|
Use Scenario: Driving 4–6 series WLEDs behind high-resolution AMOLED or LCD panels in battery-powered smartphones. IC Role / Device Role / Timing Role: Constant-current boost regulator with PWM-controlled brightness scaling synchronized to display frame rate. Use Value: Enables uniform luminance across full display area while maintaining >90% efficiency at 3.6V input and 18–24mA LED current. |
Use Scenario: Powering wide-format LCD backlights in 7–10 inch tablets requiring higher total LED current and tighter thermal management. IC Role / Device Role / Timing Role: High-frequency (750kHz) step-up controller regulating up to 25V output for 6-WLED strings with minimal EMI. Use Value: Delivers stable 24.75mA per string with ±1.3% accuracy, reducing brightness variation between display zones. |
| Portable Media Player UI Lighting | Handheld GPS Navigation Display |
|
Use Scenario: Illuminating small-form-factor color LCDs in MP3 players and e-readers with variable ambient light adaptation. IC Role / Device Role / Timing Role: Single-pin enabled LED driver supporting rapid PWM dimming transitions for dynamic UI brightness control. Use Value: Achieves seamless 100:1 brightness range using standard MCU GPIO PWM output - no additional I²C or serial interface needed. |
Use Scenario: Providing reliable backlighting for outdoor-readable GPS units operating across -40°C to +85°C temperature extremes. IC Role / Device Role / Timing Role: Robust WLED supply with UVLO, OVLO, thermal shutdown, and OVP - ensuring fault-free operation under automotive-grade conditions. Use Value: Maintains consistent LED output despite wide input voltage swings (2.6–5.5V) and transient load changes during GPS signal acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8901BETA+T | Uses 32-step serial-pulse dimming instead of PWM; identical pinout, package, and protection features. | Requires single-wire pulse timing control rather than PWM generation; not compatible with existing PWM firmware. | Select MAX8901BETA+T only when system lacks dedicated PWM generator and prefers simple pulse-based brightness stepping. |
| TPS61165DRVR | Fixed 1.2MHz switching frequency; 30V OVP; 2.7–5.5V input; requires external PWM-to-analog conversion for dimming. | Lacks integrated PWM interface - needs external RC filter or DAC for analog dimming; different pin assignment (no OVP pin). | Choose TPS61165DRVR only if higher switching frequency justifies added external components and layout complexity. |
Compared with MAX8901BETA+T and TPS61165DRVR, MAX8901AETA+TGA8 uniquely integrates direct PWM dimming on the ON pin with 25V OVP and 0.01µA shutdown - simplifying design for cost-sensitive, battery-optimized handheld displays.
Availability
MAX8901AETA+TGA8 is available at Aetrix Electronics and suitable for smartphone LCD backlighting, portable media player UI lighting, and handheld GPS navigation display applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8901AETA+TGA8 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for portable, industrial, and communications systems.
The MAX8901AETA+TGA8 belongs to Maxim's WLED backlight driver product line, engineered specifically for ultra-compact, high-efficiency LCD/AMOLED display power in space- and battery-constrained handheld devices.
FAQ
What is the maximum number of WLEDs the MAX8901AETA+TGA8 can drive?
The MAX8901AETA+TGA8 is specified to drive 2 to 6 series-connected white LEDs. With a maximum output voltage of 25V and typical WLED forward voltage of ~4.2V per diode, it reliably powers 6-WLED strings (25.2V theoretical) while maintaining regulation and protection integrity. Efficiency remains above 85% across this range at 3.6V input.
Does the MAX8901AETA+TGA8 require an external current-sense resistor?
Yes, the MAX8901AETA+TGA8 requires an external current-sense resistor (RCS) connected between the CS pin and GND. This resistor sets the full-scale LED current: for example, a 20Ω resistor yields 25mA (RCS = 500mV / ILED). The IC regulates VCS to 0.50V (typ) during 100% PWM duty cycle, making current programming precise and predictable.
What is the recommended PWM frequency range for dimming control on the MAX8901AETA+TGA8?
The MAX8901AETA+TGA8 supports PWM dimming frequencies from 30kHz to 500kHz. Operation within this range ensures optimal LED current accuracy (±1.3% typ) and avoids audible noise. Frequencies below 30kHz may cause visible flicker or reduced accuracy; above 500kHz, gate drive limitations degrade regulation stability. A 100kHz PWM signal is commonly used for balanced performance.
How does the MAX8901AETA+TGA8 handle overvoltage conditions on the input supply?
The MAX8901AETA+TGA8 incorporates input overvoltage lockout (OVLO) that activates when VIN exceeds 6.3V (typ). At that point, the IC stops switching, halting LED current flow - provided the WLED string forward voltage exceeds VIN. When VIN drops below 6.0V, soft-start resumes automatically. This protects both the IC and external components from transient overvoltage events.
Is the MAX8901AETA+TGA8 pin-compatible with the MAX8901BETA+T?
Yes, the MAX8901AETA+TGA8 is pin-compatible with the MAX8901BETA+T: both use identical 8-pin TDFN-EP packages, share the same pinout, footprint, and thermal pad layout. However, their dimming interfaces differ fundamentally - MAX8901AETA+TGA8 uses direct PWM on the ON pin, while MAX8901BETA+T uses serial-pulse timing - so firmware and external circuitry are not interchangeable.
MAX8901AETA+TGA8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
- -
MAX8901AETA+TGA8 FAQ
1.How can I place an order for MAX8901AETA+TGA8 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8901AETA+TGA8 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 MAX8901AETA+TGA8 reliable?
The price and inventory of MAX8901AETA+TGA8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8901AETA+TGA8 is usually 5 days.
3.What payment methods are accepted for MAX8901AETA+TGA8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8901AETA+TGA8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8901AETA+TGA8?
MAX8901AETA+TGA8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8901AETA+TGA8 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 MAX8901AETA+TGA8?
For technical support, including MAX8901AETA+TGA8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8901AETA+TGA8 requirements.
6.How does Aetrix verify that MAX8901AETA+TGA8 is sourced from the original manufacturer or authorized distributors?
All MAX8901AETA+TGA8 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 MAX8901AETA+TGA8 meets industry standards.
7.What is the process for return or replacement of MAX8901AETA+TGA8?
All MAX8901AETA+TGA8 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8901AETA+TGA8, 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 MAX8901AETA+TGA8 part is unused and in its original packaging.
Return procedure for MAX8901AETA+TGA8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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