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Analog Devices Inc./Maxim Integrated MAX1554ETA+TGA4
- Part No.:
- MAX1554ETA+TGA4
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
MAX1554ETA+TGA4.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
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Inventory:3,800
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Product details
Overview
MAX1554ETA+TGA4 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 compact handheld displays.
For engineers reviewing the MAX1554ETA+TGA4 datasheet, MAX1554ETA+TGA4 pinout, MAX1554ETA+TGA4 application, or MAX1554ETA+TGA4 equivalent, key selection considerations include its 8-pin TDFN 3mm × 3mm package, analog/PWM dual-mode brightness control, overvoltage protection via OV pin, soft-start timing via external capacitor, and shutdown quiescent current of 0.1µA at +25°C.
Technical Context
The MAX1554ETA+TGA4 employs a minimum off-time, current-limited control scheme with variable-frequency operation to maximize efficiency across load and input conditions. Its error amplifier regulates LED current by comparing FB voltage against a 192–217mV threshold, while internal timing logic enforces 150–350ns minimum off-time and 2.0–4.8µs maximum on-time (K = 6.3 µs·V).
It integrates overvoltage protection triggered at 1.18–1.33V on the OV pin, enabling adjustable output clamping via external resistor divider. Shutdown is controlled by EN pin (logic-high ≥1.8V), and BRT accepts either analog DC (0–1.25V) or PWM (100Hz–10kHz) signals for 10:1 brightness range without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.15V to 5.5V - supports Li-ion battery systems and regulated 3.3V/5V rails without external LDO. |
| LX Current Limit | 600–1200mA (typ. 970mA at VCC = 4.2V) - enables driving 10 white LEDs at 20mA with margin for thermal derating. |
| FB Regulation Threshold | 192–217mV - sets 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 in portable devices. |
| Shutdown Supply Current | 0.1µA at +25°C - minimizes system standby power loss when display is off. |
| UVLO Threshold | 2.35–2.65V with 35mV hysteresis - prevents erratic startup during brown-out or battery depletion. |
| Max Output Voltage | 40V - sufficient for 10× white LEDs (3.2V VF each) plus headroom for diode drop and ripple. |
Pinout & Package
MAX1554ETA+TGA4 is housed in an 8-pin TDFN-EP (3mm × 3mm) package with exposed pad (EP) for thermal dissipation. Pin 1 is GND, and the EP must be soldered to a PCB ground plane per Maxim's layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for all internal circuits and power stage; connects to EP for thermal conduction. |
| 2 VCC | Power supply input | Supplies bias and gate drive; requires local 10µF ceramic bypass capacitor due to 3.15–5.5V operating range. |
| 3 EN | Enable control input | Logic-high (≥1.8V) enables switching; logic-low (≤0.4V) disables LX and reduces supply current to 0.1µA. |
| 4 BRT | Brightness control | Accepts analog DC (0–1.25V) or PWM (100Hz–10kHz); internal 200–600kΩ resistance enables direct MCU GPIO interface. |
| 5 FB | Current-sense feedback | Connects to LED string cathode; voltage vs. RSENSE sets precise LED current (e.g., 10Ω → 20mA at 203mV). |
| 6 SS | Soft-start timing | External capacitor (e.g., 0.1µF) controls ramp rate to limit inrush; internally shorted to GND when EN = low. |
| 7 OV | Overvoltage sense | Resistor-divider from LED anode sets trip point (1.18–1.33V); halts 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 typical RDS(ON). |
Key Features
| Feature | Design Value |
|---|---|
| Analog/PWM Dual Mode™ brightness control | Single BRT pin supports both DC voltage and logic-level PWM dimming (100Hz–10kHz), eliminating need for external RC filters or DACs. |
| Integrated 40V N-channel MOSFET | 1.4Ω typical RDS(ON) switch enables high-efficiency boost conversion without external FET or driver, reducing BOM count and board area. |
| Adjustable overvoltage protection | OV pin allows user-defined output clamping (e.g., 36V for 10× LED string) via resistor divider, preventing damage during open-circuit or thermal fault conditions. |
| Soft-start with external timing capacitor | SS pin accepts standard 0.1µF ceramic capacitor to achieve ~20ms startup ramp, limiting inrush into output capacitors and LEDs. |
| Low shutdown current | 0.1µA supply current in shutdown (VEN = 0V) directly extends battery life in always-on portable devices with intermittent display usage. |
Applications
| Cellular Phone Backlight | PDA Display Illumination |
|---|---|
|
Use Scenario: Driving 8–10 white LEDs in a high-resolution TFT LCD backlight for smartphone front panel. IC Role / Device Role / Timing Role: Constant-current step-up controller regulating LED string current at 20mA with analog/PWM dimming synchronized to display frame rate. Use Value: Delivers stable luminance across 3.15–4.2V battery voltage range while maintaining >80% efficiency and <0.1µA shutdown draw. |
Use Scenario: Powering color active-matrix OLED display in ruggedized PDA with variable ambient light sensing. IC Role / Device Role / Timing Role: High-voltage boost converter supplying regulated current to OLED cathode string, enabled/disabled via host processor EN signal. Use Value: Enables rapid on/off response (<10ms startup) and precise 10:1 brightness scaling using BRT PWM without flicker or audible noise. |
| Wireless Handheld Keypad Lighting | Portable Medical Device Indicator |
|
Use Scenario: Illuminating membrane keypad LEDs in Bluetooth headset remote with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Compact LED driver delivering 15mA to 6-series LEDs, controlled by microcontroller GPIO via BRT pin. Use Value: Eliminates discrete transistor/driver stages; 3mm × 3mm footprint fits tight mechanical constraints while supporting PWM dimming down to 1% duty cycle. |
Use Scenario: Providing fail-safe status lighting in battery-powered ECG monitor with strict power budget and reliability requirements. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with OV protection and UVLO hysteresis, ensuring no false triggering during battery voltage sag. Use Value: Overvoltage clamp prevents LED overvoltage failure during open-wire faults; shutdown current <1µA preserves 5-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1553ETA+ | Lower 480mA LX current limit; supports only 2–6 LEDs; identical 8-pin TDFN package and pinout. | Suitable for smaller displays (e.g., 3.5″ QVGA) requiring ≤6 LEDs; not viable for 10-LED configurations. | Select MAX1553ETA+ only when driving ≤6 LEDs and lower cost is prioritized over headroom. |
| LT3466-1EDD#TRPBF | 40V, 1.1A switch; fixed 1.2MHz frequency; requires external compensation; no integrated OV protection. | Needs additional components for overvoltage safety and dimming interface; better suited for designs requiring fixed-frequency EMI control. | Choose LT3466-1EDD#TRPBF when synchronous rectification, higher switching frequency, or external loop control is required. |
Compared with MAX1553ETA+, the MAX1554ETA+TGA4 provides 2× higher current capability for larger LED strings, while versus LT3466-1EDD#TRPBF it offers integrated OV protection, simpler BRT dimming, and lower component count-making it optimal for space-constrained, safety-aware portable backlighting.
Availability
MAX1554ETA+TGA4 is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA display illumination, wireless handheld keypad lighting, and portable medical device indicators requiring stable component supply and long-term manufacturability.
Supply support for MAX1554ETA+TGA4 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 MAX1554ETA+TGA4 belongs to Maxim's LED backlight driver product line, engineered specifically for efficient, compact, and reliable constant-current boosting in battery-powered handheld displays with stringent size and power constraints.
FAQ
What is the maximum number of white LEDs the MAX1554ETA+TGA4 can drive?
The MAX1554ETA+TGA4 is rated to drive up to 10 white LEDs in series, assuming typical forward voltage of 3.2V per LED and sufficient headroom for diode drop and ripple. Its 40V LX rating and 970mA current limit enable this configuration at 20mA with >80% efficiency when powered from 3.6V input.
Does the MAX1554ETA+TGA4 require an external MOSFET?
No, the MAX1554ETA+TGA4 integrates a 40V, low-RDS(ON) N-channel MOSFET switch. No external FET is needed-the LX pin connects directly to the inductor and Schottky diode, simplifying design and reducing board area compared to controller-only solutions.
How does brightness control work on the MAX1554ETA+TGA4?
Brightness is controlled via the BRT pin using either analog DC voltage (0–1.25V) or logic-level PWM (100Hz–10kHz). The internal circuitry converts both inputs linearly into LED current, providing 10:1 dimming range without external filtering or DAC circuitry-enabling direct interface with MCU GPIOs.
What package type is used for the MAX1554ETA+TGA4?
The MAX1554ETA+TGA4 uses an 8-pin TDFN-EP (3mm × 3mm) package with exposed thermal pad. This compact, low-profile封装 supports high-power density designs and requires proper PCB land pattern (Maxim outline 21-0137) and EP grounding for thermal performance.
Is overvoltage protection configurable on the MAX1554ETA+TGA4?
Yes, overvoltage protection is fully configurable via the OV pin. A resistor divider from the LED anode to GND sets the trip threshold (1.18–1.33V internal reference), allowing users to define precise output clamping voltage-e.g., 36V for 10-LED strings-to prevent damage during open-circuit faults.
MAX1554ETA+TGA4 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:
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- Supplier Device Package:
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MAX1554ETA+TGA4 FAQ
1.How can I place an order for MAX1554ETA+TGA4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1554ETA+TGA4 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+TGA4 reliable?
The price and inventory of MAX1554ETA+TGA4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1554ETA+TGA4 is usually 5 days.
3.What payment methods are accepted for MAX1554ETA+TGA4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1554ETA+TGA4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1554ETA+TGA4?
MAX1554ETA+TGA4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1554ETA+TGA4 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+TGA4?
For technical support, including MAX1554ETA+TGA4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1554ETA+TGA4 requirements.
6.How does Aetrix verify that MAX1554ETA+TGA4 is sourced from the original manufacturer or authorized distributors?
All MAX1554ETA+TGA4 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+TGA4 meets industry standards.
7.What is the process for return or replacement of MAX1554ETA+TGA4?
All MAX1554ETA+TGA4 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1554ETA+TGA4, 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+TGA4 part is unused and in its original packaging.
Return procedure for MAX1554ETA+TGA4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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