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Analog Devices Inc./Maxim Integrated MAX8740ETB+T
- Part No.:
- MAX8740ETB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX8740ETB+T.pdf
- Description:
- IC REG CONV TFT LCD 1OUT 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,536
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Product details
Overview
The MAX8740ETB+T 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+T datasheet, MAX8740ETB+T pinout, MAX8740ETB+T application, or MAX8740ETB+T equivalent, key selection criteria include adjustable output voltage (VIN to 28V), ultra-low 0.1µA shutdown current, programmable soft-start via external capacitor, compensation flexibility via COMP pin, and thermal performance in the 3mm × 3mm thin DFN package.
Technical Context
The MAX8740ETB+T employs a current-mode PWM architecture with slope compensation to ensure stability across wide duty cycles (up to 94%) and fast transient response under pulsed LCD load conditions. Its error amplifier regulates output via a 1.24V FB reference, with transconductance of 100–330µS and voltage gain of 2400 V/V.
Switching frequency is selected by FREQ pin logic level (GND = 640kHz, IN = 1.2MHz), and internal MOSFET on-resistance is 0.095Ω (typ) at VIN = 5V. The device includes undervoltage lockout (2.20–2.57V threshold), 0.1µA shutdown current, and soft-start controlled by constant 4.5µA charge current into the SS pin.
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 |
| Output Voltage Range | VIN to 28V - adjustable via external resistor divider for TFT gate drive (VGH/VGL) or backlight bias |
| Switching Frequency | 640kHz or 1.2MHz - pin-selectable to optimize inductor size vs. EMI/noise trade-offs |
| Integrated MOSFET | 30V n-channel, 0.095Ω RDS(on) (typ @ 5V) - eliminates external switch, reduces BOM count |
| Efficiency | Up to 90% - enables thermally constrained LCD panel designs without heatsinking |
| Shutdown Current | 0.1µA - preserves battery life in portable display standby modes |
| Package | 10-pin thin DFN (3mm × 3mm, 0.8mm height) - surface-mount compatible with high-density PCB layouts |
Pinout & Package
MAX8740ETB+T is housed in a 10-pin thin DFN package (3mm × 3mm, 0.8mm profile) 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 power 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 | Senses output voltage via resistive divider; 1.24V regulation threshold enables precise VOUT programming |
| 3 - SHDN | Active-low shutdown control | Pulls internal bias circuitry offline; reduces supply current to 0.1µA and disables LX switching |
| 4,5 - GND | Power ground terminals | Dual GND pins minimize ground impedance in high-current return paths; must be tied together externally |
| 6,7 - LX | Switch node (MOSFET drain) | Connects to inductor/diode junction; dual pins reduce trace inductance and EMI radiation |
| 8 - IN | Input supply | Requires local 1µF ceramic bypass to GND; accepts 2.6V–5.5V with UVLO at 2.38V (typ) |
| 9 - FREQ | Frequency select input | Logic-level input: GND → 640kHz, IN → 1.2MHz; includes 5µA internal pulldown |
| 10 - SS | Soft-start control | Charged at 4.5µA to ramp peak inductor current from 0A to full limit; prevents input current surge at startup |
Key Features
| Feature | Design Value |
|---|---|
| 90% peak efficiency | Reduces thermal load in sealed LCD enclosures and extends battery runtime in portable systems |
| Programmable soft-start | External capacitor sets startup time; avoids overshoot and inrush stress on output capacitors and display panel |
| Pin-selectable switching frequency | Enables layout optimization: 1.2MHz allows <3µH inductors; 640kHz improves light-load efficiency |
| Ultra-low 0.1µA shutdown current | Meets stringent energy-saving requirements for display sleep modes per ACPI or VESA standards |
| Integrated 30V/2.4A RMS MOSFET | Eliminates external high-voltage switch; simplifies design and improves reliability over discrete solutions |
Applications
| Notebook Computer Displays | LCD Monitor Panels |
|---|---|
Use Scenario: Powering gate drivers (VGH/VGL) and source drivers in 13–17-inch notebook LCD panels with dynamic backlight dimming. IC Role / Device Role / Timing Role: Primary step-up regulator generating 18–28V bias rails from 3.3V/5V system supply. Use Value: High 90% efficiency and 1.2MHz operation enable compact, fanless display power designs meeting ENERGY STAR® thermal limits. |
Use Scenario: Providing stable high-voltage bias for 24-inch desktop LCD monitors with integrated USB-C PD input. IC Role / Device Role / Timing Role: Main DC-DC converter delivering regulated 24V output for TFT gate driver ICs and timing controller logic. Use Value: Adjustable output (VIN to 28V) and programmable soft-start prevent display flicker during hot-plug events and power sequencing. |
| Industrial HMI Displays | Medical Imaging Panels |
Use Scenario: Powering ruggedized 10.1-inch industrial touchscreens operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Single-chip boost converter supplying 20V rail for LCD column drivers and LED backlight strings. Use Value: Guaranteed -40°C to +85°C operation and 0.1µA shutdown current support long-term reliability in unventilated enclosures. |
Use Scenario: Generating precision 15V and 28V bias voltages for diagnostic-grade medical LCD panels requiring zero visual artifacts. IC Role / Device Role / Timing Role: Low-noise, current-mode step-up regulator with tight 1.24V FB reference for stable pixel voltage control. Use Value: Compensation pin (COMP) and slope-compensated architecture suppress output ripple below 20mVpp, preventing image ghosting. |
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 2.7A switch current rating; fixed 500kHz/1.2MHz dual-frequency mode; no dedicated COMP pin | Better suited for >1A loads; lacks analog compensation flexibility for custom loop tuning | Select when higher output current (>900mA) or simplified layout (no RC compensation) is prioritized over fine-grained stability control |
| RT8535GQW | Lower 20V MOSFET rating; 0.8V–24V output range; integrated soft-start but no FREQ pin for frequency selection | Restricted to ≤24V outputs; less flexible for 28V TFT gate drive; lower thermal margin at full load | Choose for cost-sensitive, lower-voltage LCD applications where 28V capability and frequency agility are not required |
Compared with TPS61088RHLR and RT8535GQW, the MAX8740ETB+T uniquely combines 28V output capability, pin-selectable frequency, analog COMP-based loop tuning, and guaranteed -40°C operation - making it optimal for high-reliability, wide-input-range TFT-LCD bias supplies.
Availability
MAX8740ETB+T is available at Aetrix Electronics and suitable for notebook computer displays, LCD monitor panels, and industrial HMI systems requiring stable component supply with extended temperature support and long-lifecycle availability.
Supply support for MAX8740ETB+T 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+T belongs to Maxim's TFT-LCD power management product line, designed specifically to deliver compact, efficient, and reliable high-voltage bias supplies for active-matrix display systems.
FAQ
What is the maximum output voltage supported by the MAX8740ETB+T?
The MAX8740ETB+T supports an adjustable output voltage range from VIN up to 28V. This is achieved using an external resistive feedback divider connected to the FB pin, with the internal error amplifier regulating against a precise 1.24V reference. The 30V-rated internal MOSFET ensures safe operation at the full 28V output, making the MAX8740ETB+T suitable for TFT-LCD gate driver (VGH) and backlight bias applications.
How does the FREQ pin affect switching frequency in the MAX8740ETB+T?
The FREQ pin on the MAX8740ETB+T selects between two fixed switching frequencies: pulling FREQ low (to GND) configures 640kHz operation, while driving FREQ high (to IN) selects 1.2MHz. An internal 5µA pulldown allows leaving FREQ unconnected for default 640kHz mode. This pin-programmable feature lets designers balance inductor size (smaller at 1.2MHz) against light-load efficiency (higher at 640kHz) without changing components.
Can the MAX8740ETB+T operate over the full industrial temperature range?
Yes, the MAX8740ETB+T is specified for operation from -40°C to +85°C ambient temperature, as confirmed in the Ordering Information table and Absolute Maximum Ratings. This extended temperature range is validated across all key parameters including input quiescent current, FB regulation voltage, and oscillator frequency - ensuring reliable performance in industrial HMI, automotive infotainment displays, and medical imaging panels where thermal stability is critical.
What is the purpose of the COMP pin on the MAX8740ETB+T?
The COMP pin on the MAX8740ETB+T is the output of the internal error amplifier and serves as the compensation node for the feedback control loop. Connecting an external series RC network from COMP to GND allows designers to tailor loop dynamics - setting integrator gain for transient response and placing a zero to ensure stability with low-ESR ceramic output capacitors. This analog compensation capability provides greater design flexibility than fixed-compensation alternatives.
How is soft-start implemented on the MAX8740ETB+T?
Soft-start on the MAX8740ETB+T is implemented via the SS pin, which is charged by a constant 4.5µA internal current source. An external capacitor connected to SS determines the ramp time: full current limit is reached after t = 2.5 × 10⁵ × CSS. During startup, SS voltage controls peak inductor current linearly from 0A at 0.4V to full limit at 1.5V. When SHDN is pulled low, the capacitor discharges to ground - ensuring controlled restart and preventing inrush current damage to the MAX8740ETB+T or downstream display circuitry.
MAX8740ETB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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 (3x3)
MAX8740ETB+T FAQ
1.How can I place an order for MAX8740ETB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8740ETB+T 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+T reliable?
The price and inventory of MAX8740ETB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8740ETB+T is usually 5 days.
3.What payment methods are accepted for MAX8740ETB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8740ETB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8740ETB+T?
MAX8740ETB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8740ETB+T 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+T?
For technical support, including MAX8740ETB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8740ETB+T requirements.
6.How does Aetrix verify that MAX8740ETB+T is sourced from the original manufacturer or authorized distributors?
All MAX8740ETB+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX8740ETB+T?
All MAX8740ETB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8740ETB+T, 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+T part is unused and in its original packaging.
Return procedure for MAX8740ETB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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