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Analog Devices Inc./Maxim Integrated MAX8901BETA+TG104
- Part No.:
- MAX8901BETA+TG104
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
MAX8901BETA+TG104.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
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Product details
Overview
MAX8901BETA+TG104 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 precise constant current for LCD backlighting in portable devices. It features serial-pulse dimming control (32 linear steps), 24.75mA full-scale LED current, 2.6V–5.5V input range, and integrated WLED overvoltage protection (25V typ). It operates in handheld applications requiring compact, battery-efficient illumination.
For engineers reviewing the MAX8901BETA+TG104 datasheet, MAX8901BETA+TG104 pinout, MAX8901BETA+TG104 application, or MAX8901BETA+TG104 equivalent, key selection criteria include single-wire dimming compatibility, TDFN-EP thermal performance, 0.01µA shutdown current, and 2mm × 2mm footprint constraints in space-constrained mobile designs.
Technical Context
The MAX8901BETA+TG104 implements a current-mode boost topology with internal 750kHz oscillator and n-channel MOSFET switch (RLX = 0.7Ω typ, ILIM = 0.7A). Its control loop uses CS node feedback to regulate LED current via internal 0.5V reference and COMP compensation network (CCOMP = 0.022µF).
Serial-pulse dimming is implemented through ON pin timing: each low pulse (500ns–500µs) decrements LED current by 0.75mA, enabling 32-step linear reduction from 24.75mA to ~0.75mA. Thermal shutdown activates at +160°C, and input UVLO/OVLO thresholds are 2.53V/6.2V (rising) respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 5.5V - supports full Li+/Li-Poly battery discharge curve without external regulation. |
| Switching Frequency | 750kHz (typ) - enables use of small 22µH inductors and ceramic capacitors for minimal board area. |
| Full-Scale LED Current | 24.75mA - sets maximum brightness level; each serial pulse reduces current by 0.75mA (32-step dimming). |
| WLED Overvoltage Threshold | 25V (typ) - latches off IC if output exceeds safe voltage, protecting LEDs and circuitry. |
| Shutdown Current | 0.01µA (typ) - minimizes battery drain during display-off states in always-on portable systems. |
| Efficiency | Up to 91% - maximizes runtime per charge when driving 4–6 WLEDs across 3.0–4.2V battery range. |
| Package | 8-pin TDFN-EP (2mm × 2mm, 0.8mm max height) - exposes thermal pad for direct PCB heat sinking. |
Pinout & Package
MAX8901BETA+TG104 is housed in an 8-pin, 2mm × 2mm TDFN-EP package with exposed thermal pad (EP) that must be soldered to a large ground plane for thermal management and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OVP | WLED overvoltage sense input | Monitors output voltage; latches shutdown if >25V - requires direct connection to output capacitor positive terminal. |
| 2 ON | Enable and serial-dimming control | High pulse ≥40µs initiates soft-start; subsequent low pulses (500ns–500µs) decrement LED current in 0.75mA steps. |
| 3 IN | Main power input | Accepts 2.6–5.5V; bypassed with 1µF ceramic cap placed adjacent to pin to suppress switching noise and supply ripple. |
| 4 LX | Boost switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace routing to minimize EMI. |
| 5 PGND | Power ground return | Carries high-current return path from LX and inductor; must be tied directly to EP and GND at single point near CIN. |
| 6 GND | Analog reference ground | Provides low-noise reference for CS and COMP; connected to EP but kept separate from noisy PGND traces until star point. |
| 7 COMP | Loop compensation node | Hosts 0.022µF capacitor to set soft-start time (10ms) and stabilize feedback loop against load transients. |
| 8 CS | Current sense input | Internally regulated to 0.5V (typ); no external resistor required - distinguishes MAX8901B from MAX8901A variant. |
| EP | Exposed thermal pad | Must be soldered to solid copper ground plane - critical for thermal dissipation and achieving 953mW power rating. |
Key Features
| Feature | Design Value |
|---|---|
| Single-wire serial-pulse dimming | 32 linear brightness steps controlled exclusively via ON pin timing - eliminates need for dedicated PWM generator or I²C interface. |
| Integrated WLED overvoltage protection | 25V threshold with latch-off behavior - prevents LED damage during open-circuit or capacitor failure without external components. |
| Ultra-low shutdown current | 0.01µA typical - extends shelf life and standby time in battery-powered devices where display may remain inactive for days. |
| Internal soft-start | 10ms controlled ramp-up of LED current - eliminates inrush stress on LEDs and avoids visible flash during power-on. |
| Input overvoltage lockout | 6.2V rising threshold - disables switching during USB charging surges or adapter transients, preventing internal overstress. |
Applications
| Smartphone LCD Backlight | Portable Media Player Display |
|---|---|
|
Use Scenario: Driving 4–6 series WLEDs behind high-resolution TFT-LCD in sub-6-inch smartphones with dynamic brightness control. IC Role / Device Role / Timing Role: Constant-current boost controller providing regulated 24.75mA output with 32-step serial dimming synchronized to ambient light sensor updates. Use Value: Enables smooth, flicker-free brightness transitions using only one GPIO line while maintaining <±3% LED current accuracy across temperature. |
Use Scenario: Powering dual-zone WLED backlight in 4.3-inch portable media players with independent top/bottom dimming. IC Role / Device Role / Timing Role: Primary WLED driver delivering up to 91% efficiency at 3.6V input, reducing thermal load on plastic enclosures during extended playback. Use Value: Eliminates need for external current-sense resistors and dimming ICs - cuts BOM cost and PCB area by 30% vs. discrete solutions. |
| Digital Camera Viewfinder | Handheld GPS Navigator |
|
Use Scenario: Illuminating OLED or transflective LCD viewfinder in compact digital cameras requiring instant-on response and low quiescent power. IC Role / Device Role / Timing Role: Fast-enable LED driver with 40µs ON pulse initiation and 1.33ms shutdown delay - supports rapid UI wake/sleep cycles. Use Value: Achieves full brightness within 10ms after enable, with 0.01µA shutdown current preserving battery for weeks between uses. |
Use Scenario: Backlighting sunlight-readable LCD in automotive-grade GPS units operating across -40°C to +85°C ambient range. IC Role / Device Role / Timing Role: Robust WLED supply with thermal shutdown (+160°C), UVLO (2.53V), and OVLO (6.2V) - ensures reliable operation under vehicle battery fluctuations. Use Value: Maintains ±3% LED current accuracy from -40°C to +85°C, preventing display dimming drift during outdoor temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8901AETA+T | Requires external PWM signal (30–500kHz) for dimming; uses CS-to-GND resistor for current setting (e.g., 20Ω for 25mA). | Preferred where system already provides clean, high-frequency PWM; not compatible with serial-pulse timing protocol. | Select MAX8901AETA+T only if existing firmware/hardware supports PWM generation - MAX8901BETA+TG104 avoids GPIO resource contention. |
| LM3632YFFR | Fixed 1.2MHz switching frequency; supports I²C dimming (256 steps); higher quiescent current (25µA vs. 115µA typ). | Suitable for designs needing fine-grained dimming resolution or multi-display synchronization via bus interface. | Choose LM3632YFFR when I²C control and tighter dimming granularity outweigh footprint and efficiency trade-offs versus MAX8901BETA+TG104. |
Compared with MAX8901AETA+T and LM3632YFFR, MAX8901BETA+TG104 uniquely delivers 32-step linear dimming via a single GPIO with no external components or communication overhead - optimizing for lowest pin count, smallest layout, and fastest firmware integration in cost-sensitive handhelds.
Availability
MAX8901BETA+TG104 is available at Aetrix Electronics and suitable for smartphone LCD backlighting, portable media player displays, digital camera viewfinders, handheld GPS navigators, and industrial HMI panels requiring stable component supply and long-term production continuity.
Supply support for MAX8901BETA+TG104 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 precision analog, mixed-signal, and power management ICs for portable, industrial, and communications applications.
The MAX8901 family was designed specifically for ultra-compact, high-efficiency WLED backlighting in battery-powered handheld devices - prioritizing minimal footprint, single-wire dimming, and robust protection across Li-ion voltage ranges.
FAQ
What dimming method does the MAX8901BETA+TG104 support?
The MAX8901BETA+TG104 supports single-wire serial-pulse dimming only - each low pulse on the ON pin (500ns–500µs width) reduces LED current by 0.75mA in 32 linear steps from 24.75mA down to ~0.75mA. It does not accept PWM signals or I²C commands. This method eliminates external dimming circuitry and simplifies firmware control in the MAX8901BETA+TG104 implementation.
Does the MAX8901BETA+TG104 require an external current-sense resistor?
No, the MAX8901BETA+TG104 does not require an external current-sense resistor. Unlike the MAX8901A variant, it uses an internal current source to regulate the CS pin to 0.5V (typ), directly setting full-scale LED current at 24.75mA. The CS pin must be left unconnected to GND - adding a resistor would disrupt the MAX8901BETA+TG104's internal dimming calibration.
What is the function of the OVP pin on the MAX8901BETA+TG104?
The OVP pin on the MAX8901BETA+TG104 monitors the WLED string voltage and triggers latch-off shutdown if it exceeds 25V (typ). It must be connected directly to the positive terminal of the output capacitor. After an OVP event, the MAX8901BETA+TG104 remains disabled until VIN is cycled or the ON pin is toggled - ensuring LED safety during open-circuit or capacitor failure conditions.
How does thermal management work for the MAX8901BETA+TG104?
The MAX8901BETA+TG104 incorporates thermal shutdown at +160°C (typ) and relies on its exposed thermal pad (EP) for heat dissipation. To maintain reliability, the EP must be soldered to a large internal or external ground plane - this is mandatory to achieve the rated 953mW power dissipation and prevent junction temperature exceedance during continuous 24.75mA operation.
Can the MAX8901BETA+TG104 operate from a 2.6V input supply?
Yes, the MAX8901BETA+TG104 is fully specified to operate from 2.6V minimum input voltage, with undervoltage lockout (UVLO) releasing at 2.53V (falling). At 2.6V input, it maintains regulation for 2–4 WLEDs (forward voltage ~6–12V) with >85% efficiency, making it suitable for deep-discharge states of single-cell Li-ion batteries - a core design requirement validated for the MAX8901BETA+TG104.
MAX8901BETA+TG104 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:
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MAX8901BETA+TG104 FAQ
1.How can I place an order for MAX8901BETA+TG104 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8901BETA+TG104 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 MAX8901BETA+TG104 reliable?
The price and inventory of MAX8901BETA+TG104 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8901BETA+TG104 is usually 5 days.
3.What payment methods are accepted for MAX8901BETA+TG104?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8901BETA+TG104 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8901BETA+TG104?
MAX8901BETA+TG104 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8901BETA+TG104 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 MAX8901BETA+TG104?
For technical support, including MAX8901BETA+TG104 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8901BETA+TG104 requirements.
6.How does Aetrix verify that MAX8901BETA+TG104 is sourced from the original manufacturer or authorized distributors?
All MAX8901BETA+TG104 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 MAX8901BETA+TG104 meets industry standards.
7.What is the process for return or replacement of MAX8901BETA+TG104?
All MAX8901BETA+TG104 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8901BETA+TG104, 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 MAX8901BETA+TG104 part is unused and in its original packaging.
Return procedure for MAX8901BETA+TG104:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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