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Analog Devices Inc./Maxim Integrated MAX1554ETA+TG40
- Part No.:
- MAX1554ETA+TG40
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
MAX1554ETA+TG40.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
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- Shipping:
Inventory:4,449
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Product details
Overview
MAX1554ETA+TG40 from Maxim Integrated is a high-efficiency, 40V step-up DC-DC converter IC designed to drive up to 10 white LEDs in series with constant-current regulation. It features an internal 40V, low-RDS(ON) N-channel MOSFET switch, 970mA LX current limit, and operates from 3.15V to 5.5V input voltage-optimized for backlighting in handheld color displays.
For engineers reviewing the MAX1554ETA+TG40 datasheet, MAX1554ETA+TG40 pinout, MAX1554ETA+TG40 application, or MAX1554ETA+TG40 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and confirmed alternative options for LED backlight power management.
Technical Context
The MAX1554ETA+TG40 uses a minimum off-time, current-limited control scheme with pulse-skipping capability to achieve high efficiency across load and input voltage ranges. Its error amplifier regulates LED current via FB voltage (192–217mV threshold) referenced to BRT input voltage, enabling analog dimming from 0–1.25V or PWM dimming at 100Hz–10kHz.
It integrates overvoltage protection triggered at 1.18–1.33V on the OV pin, soft-start timing controlled by an external capacitor on SS, and shutdown logic with EN pin thresholds (1.8V high, 0.4V low). The LX node supports peak currents up to 1200mA and withstands up to +45V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.15V to 5.5V - compatible with Li+ battery systems and 3.3V logic rails without level-shifting. |
| LX Current Limit | 600–1200mA - enables driving up to 10 white LEDs at 20mA with margin for thermal derating. |
| FB Regulation Threshold | 192–217mV - sets precise LED current via external sense resistor (e.g., 10Ω yields ~20mA at VBRT = 1.25V). |
| Efficiency | Up to 82% driving 9 LEDs at 20mA (VCC = 3.6V) - reduces thermal load and extends battery runtime. |
| Switching Node Rating | LX rated to +45V - safely handles output voltages required for 10-series white LEDs (~35V typical). |
| Soft-Start Control | SS pin accepts external capacitor (e.g., 0.1µF → 20ms ramp) - prevents inrush current into output capacitance and LED string. |
| OV Protection Threshold | 1.18–1.33V on OV pin - allows programmable overvoltage cutoff using resistor divider to prevent LED overvoltage failure. |
Pinout & Package
MAX1554ETA+TG40 is housed in an 8-pin TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed pad (EP) for thermal dissipation. Pin 1 is GND (top-left corner, marked by dot); EP must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for VCC, FB, BRT, SS, OV, and LX current; connects to EP for thermal conduction. |
| 2 VCC | Power supply input | Supplies internal circuitry; requires local 10µF ceramic bypass (C1) placed adjacent to pin. |
| 3 EN | Enable control | Logic-level input: ≥1.8V enables operation; ≤0.4V disables IC and reduces supply current to 0.1µA. |
| 4 BRT | Brightness control | Accepts analog DC (0–1.25V) or PWM (100Hz–10kHz); controls LED current linearly over 10:1 range. |
| 5 FB | Current-sense feedback | Connects to LED cathode and sense resistor; regulates current by comparing voltage to 192–217mV reference. |
| 6 SS | Soft-start timing | External capacitor sets startup ramp time; internally shorted to GND during shutdown. |
| 7 OV | Overvoltage sense | Monitors LED anode voltage via resistor divider; triggers shutdown when >1.18–1.33V to protect LEDs. |
| 8 LX | Switch node | Drives external inductor/diode; carries pulsed high-side switching current up to 1200mA peak. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V N-channel MOSFET | Eliminates external high-voltage switch; enables compact layout and reduces BOM count for 10-LED strings. |
| Dual-mode brightness control | Single BRT pin supports both analog DC and PWM dimming-no extra pins or external logic required. |
| Adjustable overvoltage protection | Resistor-divider on OV pin allows precise output voltage cutoff (e.g., 36V for 10×3.6V LEDs), preventing catastrophic LED failure. |
| Low quiescent current | 0.9mA typical operating current and 0.1µA shutdown current extend battery life in always-on display systems. |
| Minimum off-time control | 250ns fixed minimum off-time enables high efficiency at light loads via pulse skipping-no audible noise or EMI spikes. |
Applications
| Cellular Phone Backlight | PDA Display Illumination |
|---|---|
|
Use Scenario: Driving 8–10 white LEDs in series for high-brightness main display backlight in GSM/UMTS smartphones. IC Role / Device Role / Timing Role: Constant-current step-up controller regulating LED string current while adapting to varying battery voltage (3.4–4.2V). Use Value: Maintains uniform brightness across full battery discharge cycle with >80% efficiency at 20mA per LED. |
Use Scenario: Powering color TFT backlight in ruggedized PDA with wide temperature operation (-40°C to +85°C). IC Role / Device Role / Timing Role: High-voltage boost converter with OV protection ensuring safe operation during cold-start or open-circuit LED faults. Use Value: Prevents LED overvoltage damage during hot-plug or cable disconnect events via programmable OV threshold. |
| Wireless Handheld UI Lighting | Portable Medical Device Display |
|
Use Scenario: Illuminating segmented or monochrome color LCD in Bluetooth headsets or barcode scanners. IC Role / Device Role / Timing Role: Compact, low-noise LED driver supporting PWM dimming synchronized to host MCU timer outputs. Use Value: Enables flicker-free dimming down to 1% brightness without requiring external RC filters due to integrated BRT low-pass response. |
Use Scenario: Backlighting diagnostic touchscreen in portable ultrasound or glucose monitor with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: Safety-aware LED power controller with soft-start, thermal-safe current limiting, and robust shutdown behavior. Use Value: Guarantees controlled startup and fault recovery-no unregulated output surges during power-on reset sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1553ETA+ | Lower 480mA LX current limit; supports only 2–6 LEDs; 2.7–5.5V input range. | Suitable for smaller displays (e.g., sub-4" screens), not viable for 10-LED strings. | Select MAX1553ETA+ only when driving ≤6 LEDs and lower input voltage (down to 2.7V) is required. |
| LT3466EDD-1#TRPBF | 40V boost controller with external MOSFET; no integrated switch; requires additional gate driver and FET. | Offers higher flexibility in power stage selection but increases board area and component count. | Choose LT3466EDD-1#TRPBF when system-level thermal management or custom switching frequency tuning is critical. |
Compared with MAX1553ETA+, MAX1554ETA+TG40 delivers double the LED drive capacity and higher input UVLO; versus LT3466EDD-1#TRPBF, it trades external component flexibility for integration, size reduction, and faster time-to-market in space-constrained handheld designs.
Availability
MAX1554ETA+TG40 is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA display illumination, and wireless handheld UI lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1554ETA+TG40 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.
The MAX1553/MAX1554 product line was engineered specifically for efficient, compact, and reliable white LED backlighting in battery-powered portable devices-with emphasis on integration, thermal safety, and ease of dimming interface implementation.
FAQ
What is the maximum number of white LEDs the MAX1554ETA+TG40 can drive?
The MAX1554ETA+TG40 is specified to drive up to 10 white LEDs in series at 20mA, supported by its 40V output capability and 970mA LX current limit. This assumes typical forward voltage of 3.2–3.6V per LED and proper inductor/diode selection per the datasheet guidelines for Figure 3.
Does the MAX1554ETA+TG40 support PWM dimming, and what frequency range is acceptable?
Yes, the MAX1554ETA+TG40 supports direct PWM dimming on the BRT pin across 100Hz to 10kHz. Within this range, LED current scales linearly with duty cycle-0% yields minimum current, 100% yields full regulated current-without requiring external filtering due to internal signal conditioning.
What is the purpose of the OV pin on the MAX1554ETA+TG40, and how is it configured?
The OV pin on the MAX1554ETA+TG40 provides adjustable overvoltage protection by monitoring LED string voltage via a resistor divider. When voltage at OV exceeds 1.18–1.33V, the IC halts switching to prevent LED overvoltage. For a 10-LED string targeting 36V max, use R2 = 330kΩ and R3 = 10kΩ per the datasheet equation.
Can the MAX1554ETA+TG40 operate from a 3.0V input supply?
No-the MAX1554ETA+TG40 has a minimum input voltage of 3.15V (per Absolute Maximum Ratings and Electrical Characteristics tables). Operation below this risks UVLO activation and unstable regulation; for 3.0V systems, the MAX1553ETA+ (2.7V min) is the appropriate variant.
Is an evaluation kit available for the MAX1554ETA+TG40, and what does it demonstrate?
Yes, the MAX1553EVKIT evaluation platform is compatible with MAX1554ETA+TG40 and demonstrates full 10-LED driving capability (Figure 3 circuit), including PWM/analog dimming, OV protection response, soft-start behavior, and thermal performance under load-providing a validated reference for layout and component selection.
MAX1554ETA+TG40 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- 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:
- -
- Mounting Type:
- -
- Supplier Device Package:
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MAX1554ETA+TG40 FAQ
1.How can I place an order for MAX1554ETA+TG40 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1554ETA+TG40 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 MAX1554ETA+TG40 reliable?
The price and inventory of MAX1554ETA+TG40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1554ETA+TG40 is usually 5 days.
3.What payment methods are accepted for MAX1554ETA+TG40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1554ETA+TG40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1554ETA+TG40?
MAX1554ETA+TG40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1554ETA+TG40 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 MAX1554ETA+TG40?
For technical support, including MAX1554ETA+TG40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1554ETA+TG40 requirements.
6.How does Aetrix verify that MAX1554ETA+TG40 is sourced from the original manufacturer or authorized distributors?
All MAX1554ETA+TG40 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 MAX1554ETA+TG40 meets industry standards.
7.What is the process for return or replacement of MAX1554ETA+TG40?
All MAX1554ETA+TG40 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1554ETA+TG40, 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 MAX1554ETA+TG40 part is unused and in its original packaging.
Return procedure for MAX1554ETA+TG40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1554ETA+TG40 Tags
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CL2N8-G
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