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Analog Devices Inc./Maxim Integrated MAX1518ETJ+
- Part No.:
- MAX1518ETJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX1518ETJ+.pdf
- Description:
- IC REG CONV TFT LCD 1OUT 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,469
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Product details
Overview
MAX1518ETJ+ from Maxim Integrated is a TFT-LCD power management IC integrating a 1.2MHz current-mode step-up regulator (VMAIN up to 13V), dual linear-regulator controllers (VGON/VGOFF), five rail-to-rail op-amps (±150mA, 13V/µs, 12MHz), and a logic-controlled high-voltage switch with adjustable delay - all in a 32-pin 5mm × 5mm thin QFN package. It delivers panel source-driver supply, gate-on/off bias, and VCOM/gamma correction for notebook and automotive LCD displays.
For engineers reviewing the MAX1518ETJ+ datasheet, MAX1518ETJ+ pinout, MAX1518ETJ+ application, or MAX1518ETJ+ equivalent, this page provides verified technical context, exact pin functions, real-world timing and load-regulation performance, and validated alternative options for TFT-LCD power architecture design.
Technical Context
The MAX1518ETJ+ implements a fixed-frequency (1020–1380kHz) current-mode PWM step-up controller with integrated 14V/2.4A n-channel MOSFET (RDS(ON) = 250mΩ max), delivering >85% efficiency at 500mA load. Its dual linear-regulator controllers use external pass transistors: REG P (FBP = 1.25V, DRVP sink ≥1mA) for positive gate-on voltage, and REG N (FBN = 250mV, DRVN source ≥1mA) for negative gate-off voltage.
All five operational amplifiers operate from a dedicated SUP rail (4.5–13.0V), feature rail-to-rail I/O, ±150mA short-circuit output current, and are optimized for VCOM buffering and gamma-divider string driving - with confirmed 12MHz –3dB bandwidth and 13V/µs slew rate under buffer configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 5.5V - supports single-cell Li-ion or 3.3V/5V system rails without pre-regulation. |
| Main Output (VMAIN) | Up to 13V - programmable via external resistor divider; sufficient for source-driver ICs in 1080p panels. |
| Step-Up Frequency | 1.2MHz typical - enables use of ultra-low-profile 3µH inductors and ceramic output capacitors. |
| Op-Amp Count & Performance | 5 op-amps; ±150mA output, 13V/µs slew rate, 12MHz bandwidth - drives full-panel VCOM loads with <100ns settling. |
| Gate-On/Off Control | REG P (FBP = 1.25V) and REG N (FBN = 250mV) - support externally generated VGON up to +24V and VGOFF down to –8V. |
| Package | 32-pin thin QFN (5mm × 5mm, 0.8mm max height) - designed for ultra-thin LCD module integration. |
| Operating Temp | –40°C to +100°C - qualified for automotive display and industrial embedded environments. |
Pinout & Package
MAX1518ETJ+ uses a 32-pin thin QFN (5mm × 5mm, 0.8mm max thickness) with exposed thermal pad (PGND-connected). Pin numbering follows standard counter-clockwise layout starting from top-left corner (pin 1 = SRC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRC (Pin 1) | High-voltage p-channel MOSFET source | Connects to external charge-pump stage; bypass to PGND with ≥0.1µF capacitor for EMI suppression. |
| REF (Pin 2) | Internal 1.25V reference output | Stable reference for FBN feedback; requires ≥0.22µF AGND bypass for regulation accuracy. |
| AGND (Pin 3) | Analog ground for regulators | Must be connected to PGND under IC; separates noise-sensitive feedback paths from power return. |
| PGND (Pin 4) | Power ground for LX MOSFET | Low-impedance return for switching current; tie directly to input capacitor ground with wide trace. |
| OUT1–OUT5 (Pins 5,8,13,17,20) | Op-amp outputs | Drive VCOM or gamma string nodes; each supports ±150mA continuous output into resistive/capacitive loads. |
| SUP (Pin 14) | Op-amp supply rail | Accepts 4.5–13.0V; typically tied to VMAIN; bypass to BGND with 0.1µF capacitor. |
| LX (Pin 21) | Switching node | Drain of internal n-channel MOSFET; connect inductor and Schottky diode here with minimal loop area. |
| FB / FBP / FBN (Pins 23,25,27) | Feedback inputs | Regulate VMAIN (1.236V), VGON (1.25V), and VGOFF (250mV); require precision resistor dividers placed ≤5mm away. |
| DRVP / DRVN (Pins 26,28) | Linear-regulator base drives | Open-drain n-channel (DRVP) and p-channel (DRVN) outputs; drive external PNP/NPN pass transistors for VGON/VGOFF. |
| DEL / CTL / COM / DRN (Pins 29–32) | High-voltage switch control | Enable timing-controlled sequencing: DEL sets startup delay via capacitor; CTL selects SRC↔COM or DRN↔COM path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 14V/2.4A n-MOSFET | Eliminates external high-side switch; reduces BOM count and PCB area for 13V step-up stage. |
| Rail-to-rail op-amp I/O | Enables full-supply-range VCOM biasing without headroom loss - critical for high-contrast LCD operation. |
| Timer-delay fault latch | Locks out all regulator outputs after 55ms overload, preventing thermal runaway during panel short events. |
| 0.6mA quiescent current | Minimizes standby power in always-on display systems; measured with LX inactive and no load on regulators. |
| Thermal-overload protection | Shuts down at +150°C junction temperature with 15°C hysteresis - ensures reliability in sealed automotive enclosures. |
Applications
| Notebook Computer Displays | Automotive Instrument Clusters |
|---|---|
|
Use Scenario: Powering 1366×768 active-matrix LCD with integrated source/gate drivers and VCOM compensation. IC Role / Device Role / Timing Role: Single-chip solution generating VMAIN (13V/500mA), VGON (+24V/20mA), VGOFF (–8V/50mA), and VCOM (6.5V) with synchronized startup. Use Value: Reduces component count by 12+ discrete regulators and op-amps; meets JEDEC JESD22-A108 thermal cycling requirements. |
Use Scenario: Driving TFT-LCD in digital instrument cluster with extended temperature range and EMC robustness. IC Role / Device Role / Timing Role: Provides fault-latched, thermally protected power for safety-critical display - including delayed gate-on to prevent image flash during cold start. Use Value: DEL capacitor programmability enables precise 10–100ms gate-driver enable timing; meets ISO 16750-2 pulse test requirements. |
| LCD Monitor Panels | Industrial HMI Displays |
|
Use Scenario: Supporting 24-inch 1920×1080 monitor with dual-domain gamma correction and flicker-free VCOM. IC Role / Device Role / Timing Role: Five op-amps drive independent gamma segments and VCOM buffer simultaneously; SUP rail decoupled from VMAIN for noise isolation. Use Value: 12MHz bandwidth ensures <1% gamma error across 60Hz frame updates; rail-to-rail swing maintains contrast ratio >1000:1. |
Use Scenario: Powering sunlight-readable 7-inch resistive-touch TFT display in factory automation panel. IC Role / Device Role / Timing Role: Delivers stable VMAIN despite 2.6–5.5V brownout conditions; built-in UVLO (2.5V threshold) prevents erratic behavior during battery sag. Use Value: 1.5% VMAIN regulation accuracy over line/load/temperature ensures consistent brightness across 0–100% backlight dimming. |
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 |
|---|---|---|---|
| MAX1517ETJ+ | Three op-amps instead of five; identical step-up, VGON/VGOFF controllers, and pinout. | Reduced gamma-correction channel count; suitable for 4-segment or simpler VCOM architectures. | Select when fewer than five analog outputs are required - saves cost without sacrificing core power functionality. |
| TPS65150RHAR | Separate 1.2MHz boost + dual LDOs (no integrated op-amps); 20-pin WQFN; no DEL/CTL sequencing switches. | Lacks VCOM/gamma amplification; requires external op-amps for full TFT biasing. | Choose for cost-sensitive designs where external op-amps are already present or gamma complexity is low. |
Compared with MAX1517ETJ+, MAX1518ETJ+ adds two extra op-amps for expanded gamma segmentation; compared with TPS65150RHAR, it integrates full analog signal conditioning - eliminating four external op-amps and associated passive components while enabling tighter timing control via DEL/CTL.
Availability
MAX1518ETJ+ is available at Aetrix Electronics and suitable for notebook computer displays, automotive instrument clusters, and industrial HMI displays requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX1518ETJ+ 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 MAX1516/MAX1517/MAX1518 family was designed specifically for TFT-LCD panel power architectures - integrating step-up conversion, gate bias generation, and analog signal conditioning into a single ultra-thin package to reduce display module thickness and BOM cost.
FAQ
What is the maximum output voltage of the main step-up regulator in MAX1518ETJ+?
The MAX1518ETJ+ main step-up regulator supports an output voltage (VMAIN) up to 13V, set by an external resistor divider connected to the FB pin. The internal feedback reference is 1.236V (±1.5%), and operation above 13V requires an external cascoded MOSFET as specified in the datasheet's Design Procedures section.
How many operational amplifiers does MAX1518ETJ+ integrate, and what are their key electrical specs?
The MAX1518ETJ+ integrates five high-performance operational amplifiers. Each supports ±150mA short-circuit output current, 13V/µs slew rate, 12MHz –3dB bandwidth, rail-to-rail input and output voltage swing, and operates from a dedicated SUP rail (4.5–13.0V). These are explicitly characterized for VCOM buffering and gamma-correction string driving.
Does MAX1518ETJ+ support programmable startup sequencing for gate-on and gate-off voltages?
Yes, MAX1518ETJ+ supports programmable sequencing via the DEL pin: connecting a capacitor from DEL to AGND sets a precise startup delay before enabling the high-voltage switch. Combined with CTL pin control, this allows staggered activation of VGON and VGOFF - critical for avoiding LCD image artifacts during power-up.
What is the function of the REF pin on MAX1518ETJ+, and how must it be decoupled?
The REF pin on MAX1518ETJ+ provides a stable 1.25V internal reference used by the FBN feedback network for VGOFF regulation. It must be bypassed to AGND with a minimum 0.22µF ceramic capacitor placed adjacent to the pin to ensure regulation accuracy and noise immunity - as confirmed in the Pin Description and Typical Operating Circuit sections.
Can MAX1518ETJ+ operate from a 3.3V input supply, and what is its quiescent current in that condition?
Yes, MAX1518ETJ+ operates from 2.6V to 5.5V input. At VIN = 3.3V, with LX not switching and no load on regulators, its quiescent current is 0.8mA (typical), rising to 11mA (max) under active switching conditions - values confirmed in the Electrical Characteristics table across temperature and load conditions.
MAX1518ETJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 2.6V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 2.6V ~ 13V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (5x5)
MAX1518ETJ+ FAQ
1.How can I place an order for MAX1518ETJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1518ETJ+ 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 MAX1518ETJ+ reliable?
The price and inventory of MAX1518ETJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1518ETJ+ is usually 5 days.
3.What payment methods are accepted for MAX1518ETJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1518ETJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1518ETJ+?
MAX1518ETJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1518ETJ+ 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 MAX1518ETJ+?
For technical support, including MAX1518ETJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1518ETJ+ requirements.
6.How does Aetrix verify that MAX1518ETJ+ is sourced from the original manufacturer or authorized distributors?
All MAX1518ETJ+ 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 MAX1518ETJ+ meets industry standards.
7.What is the process for return or replacement of MAX1518ETJ+?
All MAX1518ETJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1518ETJ+, 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 MAX1518ETJ+ part is unused and in its original packaging.
Return procedure for MAX1518ETJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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