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Analog Devices Inc./Maxim Integrated MAX8740ETB
- Part No.:
- MAX8740ETB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX8740ETB.pdf
- Description:
- MAX8740 TFT-LCD STEP-UP DC-DC CO
- Quantity:
- Payment:
- Shipping:
Inventory:1,560
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Product details
Overview
The MAX8740ETB from Maxim Integrated is a high-efficiency, current-mode, fixed-frequency step-up DC-DC converter optimized for active-matrix TFT-LCD bias supplies. It integrates a 30V n-channel MOSFET, supports 2.6V–5.5V input, delivers up to 28V output, and operates at user-selectable 640kHz or 1.2MHz switching frequencies-enabling compact designs for notebook display power rails.
For engineers reviewing the MAX8740ETB datasheet, MAX8740ETB pinout, MAX8740ETB application, or MAX8740ETB equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency and transient response behavior, package dimensions, and two field-validated alternative parts for TFT-LCD power supply redesigns.
Technical Context
The MAX8740ETB employs a current-mode PWM architecture with slope compensation to ensure stability across wide duty cycles (up to 94%) and fast load transient response. Its error amplifier regulates output via a 1.24V FB reference, while COMP pin allows external loop tuning using RC networks for optimal phase margin in high-gain, high-bandwidth LCD bias applications.
Switching frequency selection (640kHz/1.2MHz) is controlled by the FREQ pin logic level, directly affecting inductor size and EMI profile. The internal MOSFET features 0.095Ω typical on-resistance at 5V VIN and 3.9–5.3A current limit, enabling efficient 800mA+ output capability at 13.5V with ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 5.5V - supports single-cell Li-ion or regulated 3.3V/5V system rails without pre-regulation |
| Output Voltage Range | Adjustable from VIN to 28V - enables flexible VPOS/VNEG generation for TFT gate drivers and source drivers |
| Switching Frequency | 640kHz or 1.2MHz (pin-selectable) - determines minimum inductor size (e.g., 2.7µH @ 1.2MHz) and EMI filtering requirements |
| Peak Efficiency | 90% - achieved at mid-load (e.g., 500mA @ 13.5V, 5V IN), reducing thermal stress in space-constrained display modules |
| MOSFET RDS(on) | 0.095Ω (typ @ 5V VIN) - limits conduction loss and enables >800mA continuous output with <100mV dropout at LX |
| Shutdown Current | 0.1µA - ensures negligible battery drain during display sleep mode in portable systems |
| FB Regulation Voltage | 1.24V ±20mV - sets output accuracy via external resistor divider; enables ±1.5% VOUT tolerance with 1% resistors |
| Soft-Start Control | Externally programmable via SS pin capacitor - prevents inrush current into large panel capacitance (e.g., 100µF) during power-up |
Pinout & Package
The MAX8740ETB is housed in a 10-pin thin DFN (TDFN) package measuring 3mm × 3mm × 0.8mm with exposed thermal pad. Pin 1 is marked by index area; pins 4/5 and 6/7 are internally connected GND and LX pairs respectively for low-inductance, high-current routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Compensation node for error amplifier | Connects external RC network to set loop bandwidth and phase margin; critical for stability with ceramic output caps |
| 2 - FB | Feedback input for output voltage regulation | Senses divided output voltage; 1.24V reference enables precise VOUT setting (e.g., 13.5V with 196kΩ/20kΩ divider) |
| 3 - SHDN | Active-low shutdown control | Pulls internal bias circuits offline; reduces supply current to 0.1µA and disables LX switching |
| 4,5 - GND | Power ground return paths | Must be shorted together and connected to exposed pad; forms low-impedance return for high di/dt LX current |
| 6,7 - LX | Drain of internal n-channel MOSFET | Switches inductor current; requires minimal trace area and direct connection to Schottky diode anode |
| 8 - IN | Main input supply pin | Bypassed with ≥1µF ceramic cap to GND; feeds internal bias and MOSFET gate drive circuitry |
| 9 - FREQ | Frequency select logic input | GND = 640kHz, IN = 1.2MHz; internal 5µA pulldown allows unconnected default to 640kHz |
| 10 - SS | Soft-start timing capacitor node | Charged at 4.5µA; controls ramp rate of peak inductor current to limit inrush into panel capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 30V/2.4A RMS MOSFET | Eliminates external high-voltage switch; supports 28V outputs from 5V input with no external driver needed |
| Pin-programmable switching frequency | Enables layout optimization: 1.2MHz for ultra-small inductors (2.7µH), 640kHz for lower EMI in noise-sensitive display interfaces |
| Current-mode control with slope compensation | Ensures stable operation at >90% duty cycle (e.g., 5V→28V conversion) without subharmonic oscillation |
| Programmable soft-start | Prevents overshoot and inrush damage when powering large LCD panel capacitance (≥50µF typical) |
| Ultra-low shutdown current | 0.1µA draw extends battery life in always-on display subsystems during system suspend states |
| Thermal-enhanced 3mm × 3mm TDFN | Exposed pad improves θJA to ~65°C/W; sustains 1.48W dissipation at +70°C ambient without heatsink |
Applications
| Notebook Computer Displays | LCD Monitor Panels |
|---|---|
Use Scenario: Powering gate driver (VGH/VGL) and source driver (VDD/VSS) rails in 13.3"–15.6" notebook LCD panels. IC Role / Device Role / Timing Role: Primary step-up converter generating 13.5V/800mA VPOS rail from 5V system bus. Use Value: 90% efficiency minimizes heat near sensitive display timing controllers; 1.2MHz operation allows 2.7µH inductor fitting within tight bezel height constraints. | Use Scenario: Providing regulated high-voltage bias for 24"–32" desktop LCD monitor backlight and panel driver ICs. IC Role / Device Role / Timing Role: Main DC-DC stage delivering 28V/500mA for TFT gate-on voltage (VGH) in dual-scan architectures. Use Value: Adjustable 2.6V–28V output range accommodates varying panel specifications; 640kHz mode reduces conducted EMI in EMC-critical monitor enclosures. |
| Automotive Infotainment Displays | Industrial HMI Panels |
Use Scenario: Generating stable 18V bias for automotive-grade TFT displays operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Cold-crank tolerant step-up regulator supplying VPOS rail during 4.0V–5.5V input transients. Use Value: Input undervoltage lockout (2.38V threshold) prevents malfunction during battery dips; guaranteed -40°C operation ensures reliability in vehicle cabin environments. | Use Scenario: Powering ruggedized 10.4"–15" industrial LCDs used in factory HMIs with extended temperature and shock requirements. IC Role / Device Role / Timing Role: High-reliability DC-DC converter delivering 15V/600mA for display controller and touch interface ICs. Use Value: 10-pin TDFN package withstands vibration; 0.1µA shutdown current preserves backup battery life during extended idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 1.5A MOSFET, 2.7V–12V input, fixed 500kHz/1.1MHz (no pin-select), 14-pin WQFN | Optimized for USB PD and portable power banks; lacks dedicated soft-start pin and FB accuracy for precision LCD bias | Select when higher output current (>1A) and integrated OVP are required; verify loop compensation for 28V output stability |
| RT8535GSP | 2.5V–5.5V input, 28V output, 1.2MHz fixed frequency, 10-pin WDFN, no FREQ pin, 0.2µA shutdown | Designed for cost-sensitive consumer displays; missing slope compensation and adjustable soft-start | Choose for simplified BOM where 640kHz option and fine-tuned soft-start timing are not required |
Compared with TPS61088RHLR and RT8535GSP, the MAX8740ETB uniquely combines pin-selectable frequency, dedicated soft-start control, and slope-compensated current-mode architecture-making it the only option among the three qualified for high-accuracy, high-stability TFT-LCD panel bias in notebooks and monitors.
Availability
The MAX8740ETB is available at Aetrix Electronics and suitable for notebook computer displays, LCD monitor panels, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX8740ETB 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 demanding applications.
The MAX8740ETB belongs to Maxim's TFT-LCD power management product line, engineered specifically to replace discrete boost converters in space-constrained, high-efficiency display power supplies with integrated MOSFETs and precision regulation.
FAQ
What is the maximum output voltage supported by the MAX8740ETB?
The MAX8740ETB supports an adjustable output voltage up to 28V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This is enabled by its 30V-rated internal n-channel MOSFET and current-mode control architecture, allowing reliable operation at high step-up ratios (e.g., 5V input to 28V output) commonly required for TFT-LCD gate driver supplies. The MAX8740ETB achieves this while maintaining regulation accuracy within ±1.5% using the 1.24V FB reference and external resistor divider.
How does the FREQ pin affect switching frequency selection on the MAX8740ETB?
The FREQ pin on the MAX8740ETB selects between two fixed switching frequencies: pulling FREQ low (to GND) configures 640kHz operation, while driving it high (to IN) selects 1.2MHz. This is implemented via internal logic and oscillator circuitry, with a 5µA internal pulldown ensuring default 640kHz if left unconnected. The MAX8740ETB's datasheet specifies typical frequencies of 640kHz (min 540kHz, max 740kHz) and 1.2MHz (min 1.0MHz, max 1.5MHz), directly impacting inductor size, EMI profile, and light-load efficiency.
What is the purpose of the COMP pin on the MAX8740ETB, and how is it used?
The COMP pin on the MAX8740ETB serves as the output node of the internal error amplifier and is used for loop compensation. It must be connected to ground through an external series RC network (e.g., 10kΩ + 1nF) to stabilize the feedback loop, prevent oscillation, and optimize transient response-especially critical when using low-ESR ceramic output capacitors. The MAX8740ETB's compensation design directly affects output voltage ripple and recovery time after load steps; incorrect COMP network values can cause instability or excessive overshoot during soft-start or load transients.
Can the MAX8740ETB operate with input voltages below 2.6V?
No, the MAX8740ETB cannot reliably operate with input voltages below 2.6V. Its specified input voltage range is 2.6V to 5.5V, and the undervoltage lockout (UVLO) threshold is 2.38V (typical) with 50mV hysteresis-meaning the device remains disabled until VIN rises above ~2.43V and stays active only above 2.6V. Attempting to operate the MAX8740ETB below 2.6V risks erratic regulation, failure to start, or undefined behavior, as confirmed in both the Absolute Maximum Ratings and Electrical Characteristics sections of the datasheet.
What package type and dimensions does the MAX8740ETB use?
The MAX8740ETB uses a 10-pin thin DFN (TDFN) package measuring 3.0mm × 3.0mm × 0.8mm with an exposed thermal pad, designated as T1033-1 per Maxim's package drawings. This compact footprint supports high-density PCB layouts in display modules, and the exposed pad must be soldered to a thermal copper plane for effective heat dissipation. The MAX8740ETB's pin pitch is 0.65mm, and pin 1 is identified by an index area in the top-left corner of the package outline.
MAX8740ETB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 2.6V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 2.6V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN-EP (3x3)
MAX8740ETB FAQ
1.How can I place an order for MAX8740ETB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8740ETB 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 MAX8740ETB reliable?
The price and inventory of MAX8740ETB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8740ETB is usually 5 days.
3.What payment methods are accepted for MAX8740ETB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8740ETB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8740ETB?
MAX8740ETB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8740ETB 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 MAX8740ETB?
For technical support, including MAX8740ETB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8740ETB requirements.
6.How does Aetrix verify that MAX8740ETB is sourced from the original manufacturer or authorized distributors?
All MAX8740ETB 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 MAX8740ETB meets industry standards.
7.What is the process for return or replacement of MAX8740ETB?
All MAX8740ETB units undergo pre-shipment inspection (PSI). If there is an issue with MAX8740ETB, 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 MAX8740ETB part is unused and in its original packaging.
Return procedure for MAX8740ETB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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