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Analog Devices Inc./Maxim Integrated MAX8758ETG+
- Part No.:
- MAX8758ETG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX8758ETG+.pdf
- Description:
- IC REG CONV TFT LCD 1OUT 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,853
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Product details
Overview
The MAX8758ETG+ from Maxim Integrated is a highly integrated power management IC for TFT LCD panels, combining a 640kHz/1.2MHz current-mode step-up regulator (14V/2.5A MOSFET), a ±150mA rail-to-rail op-amp for VCOM driving, and a logic-controlled high-voltage switch-control block with programmable delay. It delivers regulated source-driver voltage (up to 13V), gate-driver supplies (+24V/–8V), and backplane bias in ultra-thin notebook displays.
For engineers reviewing the MAX8758ETG+ datasheet, MAX8758ETG+ pinout, MAX8758ETG+ application, or MAX8758ETG+ equivalent, this device supports critical TFT LCD power sequencing, VCOM settling accuracy, and dual-mode gate driver timing control - all within a 4mm × 4mm thin QFN package optimized for space-constrained portable designs.
Technical Context
The MAX8758ETG+ implements a fixed-frequency current-mode PWM architecture with selectable 640kHz or 1.2MHz switching, enabling fast transient response to pulsed source-driver loads while supporting ultra-small 4.7µH inductors and ceramic output capacitors. Its internal 115mΩ n-channel MOSFET and bootstrapped gate driver achieve >85% efficiency at low input voltages (1.8V–5.5V).
The integrated op-amp operates from SUPB (4.5V–13V), delivering 7.5V/µs slew rate and 12MHz bandwidth with rail-to-rail I/O - essential for precise, low-distortion VCOM biasing. The Dual Mode™ switch-control block provides two configurable high-voltage timing paths (SRC→GON and DRN→GON) with programmable delay via external DLP capacitor and mode selection via MODE pin voltage thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, 3.3V, or 5V system rails without external regulators. |
| Step-Up Regulator Output | Adjustable 4.5V to 13.0V - set via external FB divider; 1.24V reference enables ±1.5% output accuracy. |
| Switching Frequency | 640kHz or 1.2MHz (pin-selectable) - trade-off between component size (1.2MHz) and efficiency (640kHz). |
| Integrated MOSFET | 14V, 2.5A, 115mΩ n-channel - eliminates external high-side switch; reduces BOM count and layout area. |
| Op-Amp Output Current | ±150mA short-circuit capable - drives full-panel VCOM capacitance (typically 10–50nF) with <100ns settling time. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade notebook and monitor environments. |
| Package | 24-pin, 4mm × 4mm, 0.8mm max height thin QFN-EP - thermal performance enhanced by exposed pad. |
Pinout & Package
MAX8758ETG+ uses a 24-pin, 4mm × 4mm thin QFN package with exposed thermal pad (EP). Pin 1 is located at the bottom-left corner (marking dot adjacent), and pins are numbered counter-clockwise. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Analog Ground Reference | Primary analog return path; must be separated from PGND at single-point star ground near IC. |
| GON (Pin 2) | High-Voltage Switch Output | Common node for internal p-MOSFETs; connects to LCD gate driver (VGON/VGOFF) and requires low-inductance routing. |
| CTL (Pin 3) | Timing Control Input | Edge-triggered signal controlling GON turn-on propagation delay (100ns typical); referenced to SRC/DRN. |
| DLP (Pin 4) | Delay Programming Node | 5µA current source charges external capacitor to set programmable delay before GON activation. |
| THR (Pin 5) | Falling Regulation Adjustment | Sets VGON falling threshold via resistive divider; actual regulation = 10 × VTHR (e.g., 1.2V → 12V). |
| SUPB (Pin 6) | Op-Amp Supply Rail | Power input for operational amplifier; bypassed to GND with 0.1µF ceramic capacitor for stability. |
| OUTB (Pin 7) | Op-Amp Output | Drives LCD backplane (VCOM); rail-to-rail swing supports full-panel gamma correction range. |
| NEGB (Pin 8) | Inverting Input | Accepts feedback from VCOM or gamma string; high-impedance (±50nA bias) minimizes divider loading. |
| POSB (Pin 9) | Noninverting Input | Reference input for op-amp; accepts DC bias or AC-coupled gamma signal with 0–VSUPB common-mode range. |
| N.C. (Pin 10) | No Connection | Not internally bonded; leave unconnected and unpopulated on PCB. |
| LDO (Pin 11) | Internal 5V Linear Regulator Output | Powers internal logic and control blocks; requires ≥0.22µF ceramic bypass to GND. |
| OUT (Pin 12) | LDO Input Supply | Connected directly to step-up regulator output; enables bootstrapped operation and UVLO monitoring. |
| I.C. (Pin 13) | Internally Connected | No external connection; internal test or calibration node - do not route or connect. |
| SS (Pin 14) | Soft-Start Timing Control | 4µA constant-current charge of external capacitor sets linear ramp of peak inductor current during startup. |
| COMP (Pin 15) | Error Amplifier Compensation | Connect RC network (e.g., 100kΩ + 220pF) to stabilize loop; determines phase margin and transient response. |
| FREQ (Pin 16) | Switching Frequency Select | GND = 640kHz, IN = 1.2MHz; selects oscillator frequency without changing external components. |
| IN (Pin 17) | Main Input Supply | Bypassed with 1µF ceramic capacitor; low-ESR cap required to handle high di/dt during switching. |
| LX (Pin 18) | Switching Node | Drain of internal n-MOSFET; connects to inductor and Schottky diode; minimize trace area to reduce EMI. |
| SHDN (Pin 19) | Global Shutdown Control | Active-low logic input; pulls all regulators, op-amp, and switches into low-quiescent state (<10µA total). |
| FB (Pin 20) | Voltage Feedback Input | Monitors step-up output via resistive divider; 1.24V reference enables precise output setting and fault detection. |
| PGND (Pin 21) | Power Ground Return | High-current return path for LX and internal MOSFET; separate from analog GND, joined at single point. |
| MODE (Pin 22) | Switch-Control Mode Selection | Voltage threshold (0.9×VLDO or 2.5V) selects between Mode 1 (SRC→GON) and Mode 2 (DRN→GON) timing paths. |
| DRN (Pin 23) | Drain Input for p-MOSFET | Connects to high-voltage drain rail (e.g., VGON supply); forms DRN→GON path when MODE = Mode 2. |
| SRC (Pin 24) | Source Input for p-MOSFET | Connects to high-voltage source rail (e.g., VGOFF supply); forms SRC→GON path when MODE = Mode 1. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ High-Voltage Switch Control | Two independent timing paths (SRC→GON and DRN→GON) with programmable delay and mode-selectable thresholds enable flexible gate driver sequencing for TFT panel power-up/down. |
| Bootstrapped Gate Driver Supply | Internal LDO powered from step-up output (OUT) improves efficiency at low VIN by raising gate drive voltage above input rail - critical for 1.8V–2.5V battery operation. |
| Lossless Current Limit Sensing | Integrated current-sense transresistance (0.3V/A typical) avoids external sense resistor, reducing power loss and board area while maintaining accurate overcurrent protection. |
| Rail-to-Rail Op-Amp with Fast Slew Rate | 7.5V/µs slew rate and 12MHz bandwidth ensure sub-microsecond VCOM settling across full temperature range - essential for flicker-free display operation. |
| Timer-Delay Fault Latch | Configurable fault timer (43–65ms) disables outputs only after sustained FB undervoltage, preventing nuisance shutdowns during brief load transients. |
| Thermal-Overload Protection | +160°C trip with 15°C hysteresis shuts down all functions and holds latch until input cycle or SHDN toggle - prevents permanent damage under sustained overload or poor heatsinking. |
Applications
| Notebook Display Power Management | LCD Monitor Power Solution |
|---|---|
|
Use Scenario: Powering 13.3"–15.6" notebook LCD panels requiring +8.5V source driver, +24V VGON, –8V VGOFF, and precision VCOM bias. IC Role / Device Role / Timing Role: Single-chip power hub managing step-up conversion, gate driver timing sequencing, and VCOM amplification with synchronized soft-start. Use Value: Reduces component count by >12 parts vs. discrete solution; enables <0.8mm profile via thin QFN; meets JEDEC JESD22-A108 reliability for portable use. |
Use Scenario: Driving 21.5"–27" desktop LCD monitors with high-resolution timing controllers (TCON) demanding stable, low-noise VCOM and fast gate driver response. IC Role / Device Role / Timing Role: Provides regulated main supply, dual-polarity gate drivers, and rail-to-rail VCOM buffer with <12mV offset drift over –40°C to +85°C. Use Value: Eliminates need for external op-amp and gate driver ICs; 1.2MHz option supports compact 1206-size magnetics; thermal protection ensures continuous operation at 70°C ambient. |
| TFT LCD Panel Reference Design | Industrial HMI Display Power |
|
Use Scenario: Serving as core power IC in Maxim's MAX8758EVKIT evaluation platform for rapid TFT LCD design validation and layout optimization. IC Role / Device Role / Timing Role: Demonstrates complete power tree integration including FREQ/SS/MODE/DLP configuration, COMP compensation, and thermal derating guidelines. Use Value: Accelerates time-to-test by providing validated schematics, BOM, and layout files; supports direct migration to production with same footprint and thermal design. |
Use Scenario: Powering ruggedized human-machine interface (HMI) displays in factory automation equipment operating in extended temperature and vibration environments. IC Role / Device Role / Timing Role: Delivers robust, latch-protected power with UVLO, OVLO, and thermal shutdown - meeting IEC 61000-4-2/4-4 immunity requirements. Use Value: Qualified for –40°C cold start and 85°C continuous operation; QFN-EP package withstands 50g shock per MIL-STD-883; no electrolytic capacitors required. |
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 |
|---|---|---|---|
| RT8070ZSP | Single-output boost controller (no integrated MOSFET, no op-amp, no switch control); requires external 14V MOSFET and VCOM driver. | Lacks integrated VCOM amplifier and gate driver timing logic - needs ≥3 additional ICs to match MAX8758ETG+ functionality. | Select when board space allows discrete implementation and cost sensitivity outweighs integration benefits. |
| TPS65105RGTR | Dual-output (positive/negative) charge pump + VCOM op-amp; no boost regulator or high-voltage switch control; max output 18V. | Cannot generate >13V source driver supply or control TFT gate timing - unsuitable for panels requiring VGON >18V or sequenced power-up. | Choose only for smaller panels (<10") with lower voltage requirements and no gate driver timing constraints. |
Compared with RT8070ZSP and TPS65105RGTR, the MAX8758ETG+ uniquely integrates step-up regulation, VCOM amplification, and programmable gate driver timing in one 4mm × 4mm package - eliminating six to eight external components and enabling thinner, more reliable notebook and monitor designs.
Availability
MAX8758ETG+ is available at Aetrix Electronics and suitable for notebook displays, LCD monitors, and industrial HMI systems requiring stable component supply, lead-free compliance, and long-term manufacturing continuity.
Supply support for MAX8758ETG+ 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 computing, communications, and consumer electronics.
The MAX8758 product line was designed specifically for TFT LCD panel power architectures - integrating boost conversion, VCOM driving, and gate driver timing control to replace multi-IC solutions in space- and efficiency-constrained portable displays.
FAQ
What is the maximum output voltage the MAX8758ETG+ step-up regulator can deliver?
The MAX8758ETG+ step-up regulator supports an adjustable output voltage range of 4.5V to 13.0V, set using an external resistive divider on the FB pin. The internal 1.24V reference ensures ±1.5% regulation accuracy across temperature and load. Operation above 13.0V risks triggering the 13.6V overvoltage fault threshold and latching shutdown.
How does the MAX8758ETG+ implement soft-start, and what external component is required?
The MAX8758ETG+ uses a constant-current (4µA typical) soft-start circuit charging an external capacitor connected between SS and GND. This linearly ramps the peak inductor current from zero to full limit over ~250ms (with 0.1µF), minimizing inrush current and output overshoot. No resistor is needed - only the SS-to-GND capacitor determines timing.
Can the MAX8758ETG+ drive both positive and negative gate driver supplies for TFT LCDs?
Yes - the MAX8758ETG+'s integrated Dual Mode™ high-voltage switch-control block generates both VGON (+24V typical) and VGOFF (–8V typical) using external charge-pump diodes and capacitors. The SRC and DRN pins interface with external high-voltage rails, while MODE and DLP pins configure polarity, delay, and sequencing - all without additional driver ICs.
What is the purpose of the THR pin on the MAX8758ETG+, and how is it used?
The THR pin on the MAX8758ETG+ adjusts the falling regulation threshold for the GON output. By connecting THR to a resistive divider between LDO (or OUT) and GND, the actual VGON falling level equals 10 × VTHR (e.g., 1.2V at THR yields 12V VGON fall). This enables precise control of gate driver turn-off timing critical for display image quality.
Does the MAX8758ETG+ include thermal protection, and how does it behave during overload?
Yes - the MAX8758ETG+ features thermal-overload protection that trips at +160°C junction temperature with 15°C hysteresis. When triggered, it sets a fault latch and shuts down all outputs (regulator, op-amp, switches). Recovery requires cycling VIN or toggling SHDN; the device remains inactive until junction temperature drops below +145°C.
MAX8758ETG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 1.8V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 5V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x4)
MAX8758ETG+ FAQ
1.How can I place an order for MAX8758ETG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8758ETG+ 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 MAX8758ETG+ reliable?
The price and inventory of MAX8758ETG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8758ETG+ is usually 5 days.
3.What payment methods are accepted for MAX8758ETG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8758ETG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8758ETG+?
MAX8758ETG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8758ETG+ 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 MAX8758ETG+?
For technical support, including MAX8758ETG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8758ETG+ requirements.
6.How does Aetrix verify that MAX8758ETG+ is sourced from the original manufacturer or authorized distributors?
All MAX8758ETG+ 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 MAX8758ETG+ meets industry standards.
7.What is the process for return or replacement of MAX8758ETG+?
All MAX8758ETG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8758ETG+, 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 MAX8758ETG+ part is unused and in its original packaging.
Return procedure for MAX8758ETG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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