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Analog Devices Inc./Maxim Integrated MAX1554ETA+TG51
- Part No.:
- MAX1554ETA+TG51
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
MAX1554ETA+TG51.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:4,430
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Product details
Overview
MAX1554ETA+TG51 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 color display backlighting in cellular phones and handheld devices.
For engineers reviewing the MAX1554ETA+TG51 datasheet, MAX1554ETA+TG51 pinout, MAX1554ETA+TG51 application, or MAX1554ETA+TG51 equivalent, key selection criteria include its 8-pin TDFN (3mm × 3mm) package, analog/PWM dual-mode brightness control, soft-start timing via external capacitor, overvoltage protection threshold at 1.25V, and shutdown supply current of 0.1µA at +25°C.
Technical Context
The MAX1554ETA+TG51 implements a minimum-off-time, current-limited control scheme that skips pulses under light load to maximize efficiency. Its error amplifier regulates LED current by comparing FB voltage against a 192–217mV threshold, while the internal 1.4Ω LX switch enables high-efficiency operation up to 82% when driving nine 20mA LEDs at VCC = 3.6V.
It integrates dedicated circuitry for analog dimming (0–1.25V BRT input range, 10:1 current ratio) and PWM dimming (100Hz–10kHz), with BRT input resistance of 200–600kΩ and EN logic thresholds of 1.8V (high) and 0.4V (low). The OV pin senses overvoltage via resistor divider with 1.18–1.33V rising-edge threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.15V to 5.5V - supports Li-ion battery-powered systems with regulated 3.3V rail or direct battery connection. |
| LX Current Limit | 600–1200mA - enables driving up to 10 white LEDs at 20mA with margin for thermal derating. |
| FB Threshold Voltage | 192–217mV - sets LED current precision via external sense resistor R1 without requiring external reference. |
| Efficiency | Up to 82% driving 9 LEDs at 20mA, VCC = 3.6V - extends battery life in portable backlight applications. |
| Shutdown Supply Current | 0.1µA at +25°C - minimizes system standby power loss during display off periods. |
| BRT Input Resistance | 200–600kΩ - ensures compatibility with standard microcontroller GPIOs for analog dimming without loading. |
| OV Threshold | 1.18–1.33V - provides adjustable overvoltage protection to safeguard LEDs and output capacitors. |
Pinout & Package
MAX1554ETA+TG51 is housed in an 8-pin TDFN-EP (3mm × 3mm) package with exposed pad for thermal dissipation. Pin 1 is GND, and the EP must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for VCC, FB, SS, OV, and BRT; connects to EP for thermal management. |
| 2 VCC | Power supply input | Supplies internal bias and gate drive; requires local 10µF ceramic bypass capacitor due to >6 LEDs configuration. |
| 3 EN | Enable control input | Logic-level enable: ≥1.8V activates converter; ≤0.4V places device in 0.1µA shutdown mode. |
| 4 BRT | Brightness control | Accepts 0–1.25V analog voltage or 100Hz–10kHz PWM signal to set LED current across 10:1 range. |
| 5 FB | Current-sense feedback | Connects to LED string cathode and sense resistor; regulates current via 192–217mV threshold. |
| 6 SS | Soft-start timing | External capacitor (e.g., 0.1µF) sets startup ramp time (~20ms) to limit inrush current into output capacitance. |
| 7 OV | Overvoltage sense | Resistor-divider input referenced to 1.25V threshold; disables switching if output exceeds safe level. |
| 8 LX | Switch node | Connects to inductor and Schottky diode anode; handles peak currents up to 1200mA with 1.4Ω on-resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Analog/PWM Dual Mode™ brightness control | Single BRT pin accepts either DC voltage (0–1.25V) or logic PWM (100Hz–10kHz), eliminating need for external dimming circuitry. |
| Internal 40V, 1.4Ω N-channel MOSFET | Enables compact, high-efficiency boost topology without external switch-reduces BOM count and layout complexity. |
| Adjustable overvoltage protection | OV pin allows setting precise output cutoff (e.g., 28V for 10×2.8V LEDs) via resistor divider, preventing LED overvoltage failure. |
| Soft-start with external capacitor | SS pin supports user-defined startup time (e.g., 0.1µF → ~20ms), preventing inrush-induced voltage droop on shared VCC rails. |
| Low-quiescent-current shutdown | 0.1µA shutdown current at +25°C enables true zero-power display-off state in battery-critical handheld designs. |
Applications
| Cellular Phone Display Backlight | PDA & Handheld Color Screen |
|---|---|
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 current via FB pin, with BRT-controlled dimming synchronized to UI brightness settings. Use Value: Delivers 82% efficiency at 20mA per LED (VCC = 3.6V), extending talk time by minimizing power loss in boost conversion. | Use Scenario: Powering RGB subpixel backlight arrays in palmtop PDAs with dynamic contrast adjustment. IC Role / Device Role / Timing Role: High-voltage boost converter providing stable 28V output for 10-LED strings, using OV pin to clamp voltage during transient overloads. Use Value: Internal 40V LX switch eliminates need for external HV MOSFET, reducing solution size by 35% vs. discrete alternatives. |
| Wireless Handheld Keypad Illumination | Portable Medical Device Indicator Panel |
Use Scenario: Controlling brightness of edge-lit keypad LEDs in ruggedized two-way radios with variable ambient light conditions. IC Role / Device Role / Timing Role: Analog-dimming interface between microcontroller DAC output and LED current sink, leveraging BRT pin's 200–600kΩ input impedance. Use Value: 10:1 dimming range with linear response enables smooth, flicker-free brightness transitions without software PWM overhead. | Use Scenario: Providing fail-safe backlighting for critical status indicators in battery-operated infusion pumps and diagnostic handhelds. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with OV protection and EN-controlled hard shutdown, ensuring no unintended illumination during power-up or brownout. Use Value: 0.1µA shutdown current preserves battery charge during long idle periods, supporting >6-month shelf life before first use. |
Availability
MAX1554ETA+TG51 is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA display illumination, wireless handheld UI lighting, and portable medical indicator panels requiring stable component supply and long-term production continuity.
Supply support for MAX1554ETA+TG51 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 space-constrained, battery-powered display backlighting-delivering high-efficiency, integrated step-up conversion with analog/PWM dimming in ultra-small TDFN packages.
FAQ
What is the maximum number of white LEDs the MAX1554ETA+TG51 can drive?
The MAX1554ETA+TG51 can drive up to 10 white LEDs in series at 20mA, enabled by its 40V LX rating and 970mA typical current limit. This assumes forward voltage of ~2.8V per LED (28V total), with headroom for diode drop and ripple. Driving fewer LEDs increases efficiency and thermal margin.
Does the MAX1554ETA+TG51 require an external MOSFET?
No, the MAX1554ETA+TG51 integrates a 40V, 1.4Ω N-channel MOSFET switch on-die, eliminating the need for an external high-voltage switch. This reduces bill-of-materials count, PCB area, and design complexity compared to controller-only boost ICs.
What is the input voltage range specification for MAX1554ETA+TG51?
The MAX1554ETA+TG51 operates from 3.15V to 5.5V on the VCC pin. This range accommodates single-cell Li-ion batteries (fully charged at 4.2V) and regulated 3.3V system rails. Operation below 3.15V is not guaranteed and may cause undervoltage lockout activation.
How does the MAX1554ETA+TG51 implement overvoltage protection?
The MAX1554ETA+TG51 uses the OV pin to monitor output voltage via a resistor divider. When the divided voltage reaches 1.18–1.33V (typical 1.25V), the internal comparator disables the LX switch, allowing output voltage to decay safely-protecting LEDs and output capacitors from overvoltage stress.
Can the MAX1554ETA+TG51 be used with PWM dimming only, without analog control?
Yes, the MAX1554ETA+TG51 supports standalone PWM dimming on the BRT pin across 100Hz–10kHz frequency range and 0–100% duty cycle. No analog voltage source is required-the BRT pin interprets PWM directly, converting it to proportional DC LED current without external filtering components.
MAX1554ETA+TG51 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:
- -
MAX1554ETA+TG51 FAQ
1.How can I place an order for MAX1554ETA+TG51 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1554ETA+TG51 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+TG51 reliable?
The price and inventory of MAX1554ETA+TG51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1554ETA+TG51 is usually 5 days.
3.What payment methods are accepted for MAX1554ETA+TG51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1554ETA+TG51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1554ETA+TG51?
MAX1554ETA+TG51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1554ETA+TG51 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+TG51?
For technical support, including MAX1554ETA+TG51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1554ETA+TG51 requirements.
6.How does Aetrix verify that MAX1554ETA+TG51 is sourced from the original manufacturer or authorized distributors?
All MAX1554ETA+TG51 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+TG51 meets industry standards.
7.What is the process for return or replacement of MAX1554ETA+TG51?
All MAX1554ETA+TG51 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1554ETA+TG51, 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+TG51 part is unused and in its original packaging.
Return procedure for MAX1554ETA+TG51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1554ETA+TG51 Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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