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Analog Devices Inc./Maxim Integrated MAX8739ETP+
- Part No.:
- MAX8739ETP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX8739ETP+.pdf
- Description:
- IC REG CONV TFT LCD 1OUT 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,544
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Product details
Overview
MAX8739ETP+ from Maxim Integrated is a highly integrated TFT-LCD power management IC featuring a 600kHz/1.2MHz current-mode step-up DC-DC converter (14V n-channel MOSFET, >85% efficiency), two rail-to-rail op-amps (±150mA output, 7.5V/µs slew rate, 12MHz bandwidth), and a logic-controlled high-voltage switch with adjustable delay - all in a single 20-pin TQFN package. It delivers regulated source-driver voltage (e.g., +8V/250mA) and supports VCOM/gamma driving for notebook and monitor LCD panels.
For engineers reviewing the MAX8739ETP+ datasheet, MAX8739ETP+ pinout, MAX8739ETP+ application, or MAX8739ETP+ equivalent, key selection criteria include input voltage range (1.8V–5.5V), dual-op-amp drive capability for LCD backplane and gamma strings, step-up regulator accuracy (±1.5%), thermal shutdown (+160°C), and built-in power-up sequencing with fault latching.
Technical Context
The MAX8739ETP+ implements a fixed-frequency current-mode PWM architecture for its main step-up regulator, enabling fast transient response to pulsed loads typical of TFT source drivers. Its dual operational amplifiers operate from the SUP rail (4.5V–13V) and feature rail-to-rail I/O, ±150mA short-circuit current, and 12MHz –3dB bandwidth - optimized for capacitive LCD backplane (VCOM) and resistive gamma-divider string driving.
Startup sequencing is controlled by internal LDO (5V output), DEL capacitor timing (5µA charge current, 1.24V threshold), and CTL-gated high-voltage switches (SRC↔COM, DRN↔COM). The device integrates digital soft-start (13ms), undervoltage lockout on IN (1.75V rising) and LDO (2.7V rising), and timer-based fault latching triggered by sustained FB <1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-poly, or 3.3V/5V system rails without external regulators. |
| Step-Up Regulator Frequency | 600kHz (FREQ = AGND) or 1.2MHz (FREQ = IN) - enables use of ultra-small 3.0µH/6.2µH inductors and ceramic output caps for thin-panel designs. |
| FB Regulation Voltage | 1.240V ±15mV - sets precise output voltage via external resistor divider; enables stable 8V, 10V, or 13V source-driver supplies. |
| Op-Amp Slew Rate | 7.5V/µs - ensures fast settling for dynamic VCOM correction and gamma-step transitions in active-matrix displays. |
| Thermal Shutdown Threshold | +160°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Soft-Start Duration | 13ms (FREQ = AGND) - limits inrush current during power-up, preventing input rail collapse and output overshoot. |
| LX MOSFET RDS(on) | 400mΩ max at 200mA - minimizes conduction loss and heat generation in high-current boost stage. |
Pinout & Package
The MAX8739ETP+ is housed in a 20-pin, 5mm × 5mm, 0.8mm-thick TQFN-EP package with exposed pad for thermal dissipation. Pin numbering follows standard counter-clockwise layout starting from top-left corner (Pin 1 = COM).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (Pin 1) | High-voltage switch common node | Shared terminal for SRC↔COM and DRN↔COM p-channel MOSFETs; connects to gate-driver supply return path. |
| SRC (Pin 2) | Switch source input | Source of internal p-channel MOSFET; bypassed to PGND with ≥0.1µF ceramic cap for low-impedance gate-drive return. |
| LDO (Pin 3) | 5V linear regulator output | Powers internal logic, reference, and control circuitry (excluding op-amps); requires ≥0.22µF AGND bypass. |
| PGND (Pin 4) | Power ground | Source node of LX n-channel MOSFET; must be connected to input capacitor ground via short/wide trace. |
| AGND (Pin 5) | Analog ground | Reference for FB, COMP, op-amp inputs; tied to PGND under IC for noise isolation. |
| POS1/NEG1/OUT1 (Pins 6/7/8) | Op-amp 1 noninv./inv. input & output | Drives VCOM or gamma string segment; ±150mA output supports direct connection to panel capacitance. |
| OUT2/NEG2/POS2 (Pins 9/10/11) | Op-amp 2 output & inputs | Independent second amplifier for redundant VCOM or multi-string gamma correction. |
| SUP (Pin 12) | Op-amp supply rail | Positive supply for both op-amps (4.5V–13V); tied directly to step-up output; bypassed with 0.1µF to AGND. |
| LX (Pin 13) | Switching node | Drain of integrated 14V n-channel MOSFET; connects to inductor and catch diode; critical for EMI minimization. |
| IN (Pin 14) | Main input supply | Primary power input (1.8V–5.5V); feeds LDO and controller; UVLO triggers at 1.75V rising edge. |
| FREQ (Pin 15) | Oscillator frequency select | Logic-controlled: AGND = 600kHz, IN = 1.2MHz; includes internal 5µA pulldown for default low state. |
| FB (Pin 16) | Regulator feedback | Monitors output voltage via resistor divider; regulates to 1.24V; fault latches if held <1.0V for >47ms. |
| COMP (Pin 17) | Error amplifier compensation | Connects RC network for loop stability; transconductance 75–280µS enables robust compensation across load conditions. |
| DEL (Pin 18) | Delay capacitor input | Charged by 5µA current source; delay time = CDEL × 1.25V / 5µA; disables switches until VDEL >1.24V. |
| CTL (Pin 19) | Switch control input | High = SRC↔COM on (Q1), DRN↔COM off; Low = Q1 off, Q2 on; enabled only after LDO UVLO exit and DEL threshold. |
| DRN (Pin 20) | Switch drain input | Drain of back-to-back p-channel MOSFETs; used for negative gate-drive (e.g., VGOFF) when CTL = low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual high-current op-amps | ±150mA short-circuit output current enables direct driving of large LCD backplane capacitance without external buffers. |
| Integrated 14V n-channel MOSFET | 0.2Ω typical RDS(on) eliminates need for external high-side switch, reducing BOM count and board area. |
| Adjustable startup delay | Programmable via external DEL capacitor (e.g., 100nF = ~25ms delay), ensuring proper sequencing between source and gate drivers. |
| Built-in power-up sequence | Automatically sequences LDO enable → soft-start → DEL charging → switch activation, eliminating external timing components. |
| Rail-to-rail op-amp I/O | Supports full-supply swing (0V to VSUP) for maximum gamma-correction linearity and VCOM headroom. |
Applications
| Notebook Computer Displays | LCD Monitor Panels |
|---|---|
Use Scenario: Powering 13.3"–15.6" active-matrix TFT panels with integrated source and gate drivers. IC Role / Device Role / Timing Role: Generates +8V source-driver supply and ±22V/−7V gate-driver supplies while synchronizing VCOM and gamma string timing. Use Value: Single-chip solution reduces component count by >30% vs. discrete boost + op-amp + switch designs; 0.8mm profile enables ultra-thin clamshell form factors. | Use Scenario: Driving 21.5"–27" desktop LCD monitors requiring high-current VCOM correction and multi-segment gamma calibration. IC Role / Device Role / Timing Role: Dual op-amps deliver synchronized ±150mA VCOM drive and precision gamma-string biasing; step-up regulator maintains stable 10V source supply under video-load transients. Use Value: 7.5V/µs slew rate and 12MHz bandwidth ensure sub-µs settling for high-refresh-rate (120Hz+) panels without visible ghosting. |
| Industrial HMI Displays | Medical Imaging Terminals |
Use Scenario: Reliable power and biasing for ruggedized 7"–12" touch-enabled TFT displays in factory automation panels. IC Role / Device Role / Timing Role: Provides fault-latched protection (UVLO, thermal, FB fault) and wide-temp operation (−40°C to +85°C) for unattended operation. Use Value: Timer-based fault latch prevents intermittent failures from propagating; thermal shutdown (+160°C) ensures safe operation in sealed enclosures. | Use Scenario: High-stability analog biasing for diagnostic-grade grayscale LCDs in ultrasound and MRI consoles. IC Role / Device Role / Timing Role: Rail-to-rail op-amps deliver <12mV input offset and >50dB CMRR for pixel-perfect grayscale uniformity across full temperature range. Use Value: 0.01%/V line regulation and ±1.5% output accuracy maintain consistent luminance and contrast over varying input and load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TFT-LCD power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8740ETP+ | Same pinout and core architecture; adds dedicated VGH/VGL charge-pump outputs and enhanced gate-driver timing control. | Required for panels needing independent high-side/low-side gate drive with programmable ramp rates. | Select MAX8740ETP+ when gate-driver sequencing complexity exceeds MAX8739ETP+ capabilities - e.g., for 4K UHD panels with dual-gate architectures. |
| RT8558GQW | Single-channel boost + dual op-amps; no integrated high-voltage switch; lower op-amp output current (±100mA); 16-pin QFN. | Suitable for cost-sensitive designs where external gate-driver FETs are acceptable and VCOM drive current ≤100mA suffices. | Choose RT8558GQW for simplified BOM and lower unit cost where panel size ≤10.1" and gate-driver switching is handled externally. |
Compared with MAX8740ETP+, the MAX8739ETP+ offers tighter integration of timing and protection but lacks dedicated gate-driver outputs; versus RT8558GQW, it provides higher op-amp drive strength and embedded high-voltage switching - making it optimal for mid-size notebook and monitor panels requiring minimal external components.
Availability
MAX8739ETP+ is available at Aetrix Electronics and suitable for notebook computer displays, LCD monitor panels, and industrial HMI systems requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MAX8739ETP+ 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 solutions for demanding electronic systems.
The MAX8739ETP+ belongs to Maxim's TFT-LCD power management product line, engineered specifically to consolidate source-driver supply generation, VCOM/gamma biasing, and gate-driver timing into one ultra-thin package for portable and desktop display applications.
FAQ
What is the recommended inductor value for the MAX8739ETP+ step-up regulator?
The MAX8739ETP+ supports two switching frequencies: 600kHz (FREQ = AGND) and 1.2MHz (FREQ = IN). For 600kHz operation, a 6.2µH inductor is recommended; for 1.2MHz, a 3.0µH inductor is specified. Both values are optimized for low-profile, high-efficiency operation with ceramic output capacitors and minimize EMI in space-constrained LCD modules. Inductor saturation current must exceed 1.9A peak.
Can the MAX8739ETP+ drive a 15-inch LCD panel's VCOM directly?
Yes, the MAX8739ETP+ can drive a 15-inch LCD panel's VCOM directly using either OUT1 or OUT2. Each op-amp delivers ±150mA short-circuit current and features rail-to-rail output swing, sufficient for typical VCOM loads up to ~10µF capacitance and 100kΩ resistance. Layout best practices include short traces, local 0.1µF bypassing at SUP, and avoiding routing near noisy switching nodes like LX.
How does the DEL pin delay function work in the MAX8739ETP+?
The DEL pin in the MAX8739ETP+ controls startup sequencing via an external capacitor (CDEL) tied to AGND. A 5µA internal current source charges CDEL after LDO UVLO exit and soft-start completion. When CDEL voltage reaches 1.24V, the high-voltage switches (SRC↔COM, DRN↔COM) become active. Delay time = CDEL × 1.25V / 5µA - e.g., 100nF yields ~25ms delay, ensuring gate drivers activate only after source-driver supply stabilizes.
What protection features are integrated into the MAX8739ETP+?
The MAX8739ETP+ integrates multiple hardware-level protections: input undervoltage lockout (1.75V rising), LDO undervoltage lockout (2.7V rising), SUP undervoltage fault (1.4V threshold), FB fault latching (triggered by sustained <1.0V for >47ms), thermal shutdown (+160°C with 15°C hysteresis), and digital soft-start (13ms). These operate autonomously without firmware, ensuring robustness in mission-critical display systems.
Is the MAX8739ETP+ pin-compatible with other members of the MAX87xx family?
No, the MAX8739ETP+ is not pin-compatible with other MAX87xx devices such as MAX8740ETP+ or MAX8741ETP+. While sharing functional similarities, pin assignments differ significantly - e.g., MAX8740ETP+ repurposes several pins for dedicated gate-driver control signals (VGH_EN, VGL_EN) and lacks the DEL pin. Board redesign is required when substituting across this family.
MAX8739ETP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 1.8V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 1.8V ~ 13V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX8739ETP+ FAQ
1.How can I place an order for MAX8739ETP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8739ETP+ 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 MAX8739ETP+ reliable?
The price and inventory of MAX8739ETP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8739ETP+ is usually 5 days.
3.What payment methods are accepted for MAX8739ETP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8739ETP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8739ETP+?
MAX8739ETP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8739ETP+ 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 MAX8739ETP+?
For technical support, including MAX8739ETP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8739ETP+ requirements.
6.How does Aetrix verify that MAX8739ETP+ is sourced from the original manufacturer or authorized distributors?
All MAX8739ETP+ 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 MAX8739ETP+ meets industry standards.
7.What is the process for return or replacement of MAX8739ETP+?
All MAX8739ETP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8739ETP+, 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 MAX8739ETP+ part is unused and in its original packaging.
Return procedure for MAX8739ETP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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