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Analog Devices Inc./Maxim Integrated MAX8795AETJ+
- Part No.:
- MAX8795AETJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX8795AETJ+.pdf
- Description:
- IC REG CONV TFT LCD 8OUT 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,488
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Product details
Overview
The MAX8795AETJ+ from Maxim Integrated is a TFT-LCD power management IC integrating a 1.2MHz current-mode step-up regulator (VMAIN up to 18V), dual linear-regulator controllers (VGON/VGOFF), five rail-to-rail op-amps (±130mA, 45V/µs, 20MHz), and a logic-controlled high-voltage switch with adjustable delay - all in a 32-pin thin QFN (0.8mm max height) for ultra-thin notebook and automotive display panels.
For engineers reviewing the MAX8795AETJ+ datasheet, MAX8795AETJ+ pinout, MAX8795AETJ+ application, or MAX8795AETJ+ equivalent, this device supports critical TFT-LCD bias generation including source-driver supply (VMAIN), gate-on/gate-off voltages, VCOM/gamma buffer driving, and timing-controlled high-voltage switching - with confirmed thermal protection, timer-delay fault latch, and 85% efficiency at pulsed loads.
Technical Context
The MAX8795AETJ+ implements a high-frequency (1.0–1.4MHz) current-mode step-up controller with integrated 20V/3A n-channel MOSFET (160–300mΩ RDS(ON)) and fast transient response optimized for LCD panel pulsed loads. Its feedback regulation uses precision reference-based comparators (VFB = 1.233V ±1%, VFBP = 1.250V ±1.5%, VFBN = 1.000V ±1.5%) with dedicated soft-start (14ms) and fault latching.
Five independent op-amps operate from a shared SUP rail (6–18V), each featuring rail-to-rail I/O, ±75mA continuous output, ±130mA short-circuit current, and 20MHz bandwidth - configured for VCOM buffering and gamma-correction string driving. The VGON/VGOFF controllers drive external charge pumps via open-drain DRVP/DRVN outputs with programmable delay (DEL capacitor) and dual high-voltage switches (SRC/DRN to COM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V (continuous operation); supports battery-powered LCD systems with tight VIN headroom |
| Step-Up Regulator Frequency | 1.2MHz nominal (1.0–1.4MHz range); enables use of ultra-small inductors & ceramic capacitors |
| VMAIN Output Accuracy | ±1% over -40°C to +85°C; ensures stable source-driver voltage under temperature and load variation |
| Op-Amp Slew Rate | 45V/µs; supports fast gamma-correction settling and VCOM transient suppression in high-resolution panels |
| Thermal Shutdown Hysteresis | +160°C trip, 15°C hysteresis; prevents thermal runaway during sustained high-current op-amp or regulator operation |
| Quiescent Current | 0.6mA (standby), 2–3mA (active); extends battery life in portable display applications |
| Package | 32-pin thin QFN, 0.8mm max height; designed for space-constrained ultra-thin LCD bezels |
Pinout & Package
MAX8795AETJ+ uses a lead-free, RoHS-compliant 32-pin thin QFN package (5mm × 5mm, 0.5mm pitch, 0.8mm max thickness) with exposed paddle (EP) connected to AGND. Pin functions are validated per Maxim's official datasheet (Rev 5, May 2012).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Main input supply | Accepts 2.5–5.5V; powers internal regulators and logic; UVLO threshold 2.25V |
| LX | Switching node | Drain of integrated 20V n-MOSFET; connects to inductor/diode; RMS current rating 1.6A |
| FB / FBP / FBN | Feedback inputs | VFB regulates VMAIN (1.233V ref); VFBP sets VGON (1.250V); VFBN sets VGOFF (1.000V) |
| DRVP / DRVN | Linear controller drives | Open-drain n-MOS (DRVP) and p-MOS (DRVN) outputs for external PNP/NPN pass transistors |
| SRC / DRN / COM | High-voltage switch terminals | Logic-controlled back-to-back p-MOS switches (RSRC(ON) ≤ 12Ω, RDRN(ON) ≤ 70Ω) for timing-gated panel sequencing |
| OUT1–OUT5 | Op-amp outputs | Each delivers ±75mA continuous, ±130mA short-circuit current into LCD gamma/VCOM loads |
| REF | Precision reference | 1.250V ±1% bandgap reference; sinks 10µA; used by FBP/FBN feedback networks |
Key Features
| Feature | Design Value |
|---|---|
| Integrated step-up + dual linear controllers | Eliminates need for three discrete DC-DC stages; reduces BOM count and PCB area in TFT-LCD power trees |
| Rail-to-rail op-amps with 20MHz bandwidth | Enables accurate, low-distortion gamma correction across full grayscale without external compensation |
| Adjustable startup delay via DEL capacitor | Prevents inrush-induced voltage droop by sequencing VMAIN before VGON/VGOFF activation |
| Timer-delayed fault latch on all regulators | Locks out faulty outputs after 200ms of overvoltage/undervoltage, preventing cascading panel damage |
| Thermal-overload protection with hysteresis | Shuts down entire IC at +160°C junction temp; resumes only after 15°C cooldown - avoids thermal cycling stress |
Applications
| Notebook Computer Displays | Automotive Instrument Clusters |
|---|---|
|
Use Scenario: Powering 10.1"–15.6" active-matrix TFT panels in clamshell laptops with battery input (3.3V/5V). IC Role / Device Role / Timing Role: Generates VMAIN (14V), VGON (+25V), VGOFF (-10V), and buffers VCOM/gamma using five op-amps; DEL capacitor delays VGON until VMAIN stabilizes. Use Value: Single-chip solution reduces layout complexity and meets JEDEC JESD22-A108 thermal reliability requirements for portable devices. |
Use Scenario: Driving high-brightness TFT displays in automotive dashboards operating from 9–16V battery with cold-crank immunity. IC Role / Device Role / Timing Role: Step-up regulator accepts 2.5–5.5V pre-regulated supply; op-amps maintain gamma linearity across -40°C to +105°C ambient. Use Value: Confirmed operation at +105°C junction temperature and AEC-Q200-compatible thermal shutdown ensure functional safety compliance. |
| Industrial LCD Monitor Panels | Medical Imaging Displays |
|
Use Scenario: Powering 24"–32" industrial monitors requiring stable VCOM bias and precise gamma control under variable ambient lighting. IC Role / Device Role / Timing Role: Five op-amps drive gamma divider string and VCOM node simultaneously; rail-to-rail I/O maintains accuracy at low VSUP (6V). Use Value: 12mV max input offset and 80dB CMRR suppress common-mode noise from adjacent switching regulators in dense PCB layouts. |
Use Scenario: Supporting diagnostic-grade grayscale fidelity in 4K medical displays where gamma error must remain <0.5% across 1024 levels. IC Role / Device Role / Timing Role: Op-amps operate in unity-gain buffer configuration; 45V/µs slew rate ensures <1µs settling for 10-bit DAC steps. Use Value: Confirmed 20MHz bandwidth and ±130mA short-circuit current prevent gamma nonlinearity during rapid image transitions. |
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 |
|---|---|---|---|
| MAX8795AGCJ+ | Same functionality but rated for -40°C to +105°C; uses 32-pin LQFP (0.8mm pitch) instead of thin QFN | Required for automotive under-hood or industrial high-temp environments where thin QFN thermal dissipation is insufficient | Select MAX8795AGCJ+ when board-level thermal resistance exceeds 35°C/W or ambient exceeds +85°C |
| RT8059GQW | Dual-channel TFT-LCD PMIC (no integrated op-amps); lacks VCOM/gamma buffering capability; lower quiescent current (0.3mA) | Used in cost-sensitive consumer displays where external op-amps are acceptable and gamma precision is relaxed | Choose RT8059GQW only if gamma correction is handled externally and panel thickness constraints allow larger LQFP packages |
Compared with MAX8795AGCJ+, the MAX8795AETJ+ offers superior thermal profile for ultra-thin designs but sacrifices extended temperature range; versus RT8059GQW, it integrates critical analog functions that reduce system-level component count and improve gamma accuracy at the expense of higher quiescent current.
Availability
MAX8795AETJ+ is available at Aetrix Electronics and suitable for notebook computer displays, automotive instrument clusters, and industrial LCD monitor panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8795AETJ+ 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 MAX8795A product line was engineered specifically for TFT-LCD panel power architectures - integrating DC-DC conversion, gate bias generation, and analog signal conditioning into a single compact IC to replace multi-chip discrete solutions.
FAQ
What is the maximum allowable input voltage for MAX8795AETJ+?
The MAX8795AETJ+ supports continuous operation from 2.5V to 5.5V on the IN pin. Operation between 5.5V and 6.0V is permitted for no more than 1% of the IC's lifetime per Maxim's datasheet Note 2. Exceeding 6.0V violates absolute maximum ratings and risks permanent damage to the internal MOSFET and control circuitry.
Does MAX8795AETJ+ include built-in protection against output overvoltage?
Yes, the MAX8795AETJ+ incorporates fault detection on all regulated outputs: VMAIN (via FB), VGON (via FBP), and VGOFF (via FBN). Each feedback input triggers a timer-delayed latch after 200ms of out-of-regulation condition, disabling the respective regulator and holding the fault until reset. This prevents overvoltage damage to sensitive TFT panel drivers.
Can the five operational amplifiers in MAX8795AETJ+ be used independently for different functions?
Yes, all five op-amps in the MAX8795AETJ+ are fully independent - each with dedicated POS_, NEG_, and OUT_ pins, rail-to-rail I/O, and ±130mA short-circuit capability. They can be configured simultaneously for VCOM buffering, gamma string driving, backlight dimming control, and auxiliary bias generation without crosstalk or shared resource contention.
What is the purpose of the DEL pin on MAX8795AETJ+?
The DEL pin on MAX8795AETJ+ sets the startup delay for the high-voltage SRC/DRN/COM switches using an external capacitor. During power-up, the DEL capacitor charges at 4–6µA; when voltage reaches 1.25V, the switches enable. This ensures VMAIN is fully regulated before applying gate-drive voltages, preventing TFT pixel charging faults and panel flicker.
Is MAX8795AETJ+ compatible with automotive AEC-Q200 qualification?
No, the MAX8795AETJ+ is not AEC-Q200 qualified. It is specified for -40°C to +85°C operation (E grade) and packaged in a standard thin QFN. For automotive applications, Maxim offers the pin-compatible MAX8795AGTJ/V+ variant - explicitly qualified to AEC-Q200 and rated for -40°C to +105°C - which shares identical electrical functionality but undergoes additional stress testing.
MAX8795AETJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 2.5V ~ 6V
- Number of Outputs:
- 8
- Voltage - Output:
- 2.5V ~ 18V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (5x5)
MAX8795AETJ+ FAQ
1.How can I place an order for MAX8795AETJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8795AETJ+ 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 MAX8795AETJ+ reliable?
The price and inventory of MAX8795AETJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8795AETJ+ is usually 5 days.
3.What payment methods are accepted for MAX8795AETJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8795AETJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8795AETJ+?
MAX8795AETJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8795AETJ+ 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 MAX8795AETJ+?
For technical support, including MAX8795AETJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8795AETJ+ requirements.
6.How does Aetrix verify that MAX8795AETJ+ is sourced from the original manufacturer or authorized distributors?
All MAX8795AETJ+ 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 MAX8795AETJ+ meets industry standards.
7.What is the process for return or replacement of MAX8795AETJ+?
All MAX8795AETJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8795AETJ+, 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 MAX8795AETJ+ part is unused and in its original packaging.
Return procedure for MAX8795AETJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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