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Analog Devices Inc./Maxim Integrated MAX8722AEEG+
- Part No.:
- MAX8722AEEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Lighting, Ballast Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX8722AEEG+.pdf
- Description:
- IC CCFL CNTRL 80KHZ 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
The MAX8722AEEG+ from Maxim Integrated is a dedicated CCFL backlight controller IC optimized for full-bridge resonant inverter topologies, delivering precise lamp-current regulation (790 mV IFB reference), 10:1 analog-digital hybrid dimming (via CNTL pin and DPWM), and integrated 5.3 V/10 mA linear regulator - all in a 24-pin QSOP package rated for -40°C to +85°C operation. It drives four external n-channel MOSFETs to power cold-cathode fluorescent lamps in notebook displays.
For engineers reviewing the MAX8722AEEG+ datasheet, MAX8722AEEG+ pinout, MAX8722AEEG+ application, or MAX8722AEEG+ equivalent, this page delivers verified functional architecture, validated safety features (lamp-out timeout, secondary overcurrent protection), confirmed dimming control interface (0–2 V CNTL input, adjustable DPWM frequency), and real-world operating constraints including 4.6–28 V BATT input range and 30–80 kHz resonant switching.
Technical Context
The MAX8722AEEG+ implements a transconductance error amplifier with COMP output driving PWM logic, where lamp current is regulated via full-wave rectified IFB feedback referenced to 790 mV. Its resonant control uses zero-current crossing detection on LX1/LX2 and primary overcurrent sensing with 240–460 ns leading-edge blanking.
Dimming combines analog CNTL voltage (0–2 V) setting DPWM duty cycle (10–100%) and digital chopping at user-adjustable frequency (106–343 Hz via RFREQ resistor or external SYNC signal). Safety logic includes dual fault timers (TFLT capacitor-set timeouts for lamp-out and ISEC overcurrent), secondary voltage limiting (2.3 V VFB threshold), and UVLO (4.0–4.58 V hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| BATT Input Voltage Range | 4.6 V to 28 V - supports wide-input DC supplies common in notebook and LCD monitor power rails. |
| Lamp Current Regulation Point | 790 mV on IFB pin - sets RMS lamp current via external sense resistor; enables stable brightness across temperature. |
| Dimming Range | 10:1 - achieved by analog CNTL voltage (0–2 V) controlling DPWM duty cycle from 10% to 100%. |
| DPWM Frequency Range | 106 Hz to 343 Hz - adjustable via FREQ pin resistor (100 kΩ to 340 kΩ); sync-capable to external 10–50 kHz signal. |
| Resonant Switching Frequency | 30 kHz to 80 kHz - fixed by external tank components; enables ZVS operation for low EMI and high efficiency. |
| VCC Output | 5.3 V ±3% @ 10 mA - powers internal circuitry and external gate drivers; eliminates need for external bias supply. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade display applications including portable computing and embedded monitors. |
Pinout & Package
MAX8722AEEG+ is housed in a 24-pin QSOP (E24-1) package with exposed thermal pad. Pin functions are validated per Maxim's official pin description table and functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Primary power input | Feeds internal 5.3 V LDO; requires 0.1 µF ceramic bypass to GND for stability. |
| SHDN (Pin 2) | Enable/disable control | Pulling to GND disables all outputs and reduces quiescent current to ≤20 µA. |
| ILIM (Pin 3) | Primary current limit setpoint | Voltage divider sets threshold as 1/5 of ILIM voltage; default = 0.2 V when tied to VCC. |
| TFLT (Pin 4) | Fault timeout timing | Capacitor to GND sets timeout duration for lamp-out and secondary overcurrent faults. |
| CNTL (Pin 5) | Analog brightness control | 0–2 V input directly maps to 10–100% DPWM duty cycle; >2 V clamps at max brightness. |
| DPWM (Pin 6) | Dual-mode signal I/O | Configurable as DPWM output or low-frequency sync input; supports soft-start/stop transitions. |
| SYNC (Pin 7) | High-frequency sync input | Accepts 10–50 kHz external clock; DPWM frequency = 1/128 × SYNC frequency. |
| FREQ (Pin 8) | DPWM frequency adjustment | Resistor to GND sets frequency; connect to VCC to enable SYNC mode. |
| COMP (Pin 9) | Error amplifier output | Drives external compensation capacitor; sets lamp current rise/fall time during DPWM dimming. |
| IFB (Pin 10) | Lamp current feedback | Full-wave rectified sense voltage regulated to 790 mV; <600 mV for >timeout triggers lamp-out fault. |
| VFB (Pin 11) | Secondary voltage feedback | Half-wave rectified capacitive divider voltage; >2.3 V triggers COMP discharge to limit transformer stress. |
| ISEC (Pin 12) | Secondary current feedback | Sense resistor voltage; >1.21 V triggers COMP discharge for secondary overcurrent protection. |
| GH2, GH1 (Pins 13,18) | High-side gate drivers | Drive external NH2/NH1 MOSFET gates; each has 20–37 Ω on-resistance and 0.3 A max output. |
| LX2, LX1 (Pins 14,17) | High-side return / current sense | Return path for GH2/GH1; input to zero-crossing and overcurrent comparators. |
| BST2, BST1 (Pins 15,16) | Bootstrap supply inputs | Support floating high-side drive; require 0.1 µF capacitor from LXx to BSTx and bootstrap diode. |
| GL2, GL1 (Pins 20,19) | Low-side gate drivers | Drive external NL2/NL1 MOSFET gates; each has 10–20 Ω on-resistance and 0.3 A max output. |
| PGND (Pin 21) | Power ground return | Return for GL1/GL2 drivers; must be connected to GND under IC's exposed pad for thermal performance. |
| VDD (Pin 22) | Low-side driver supply | Connected to VCC; powers GL1/GL2 drivers; bypassed with 0.1 µF to PGND. |
| VCC (Pin 23) | Internal LDO output | 5.3 V ±3%, 10 mA max; powers internal logic, drivers, and DPWM oscillator. |
| GND (Pin 24) | Analog ground reference | Reference for VCC, IFB, VFB, COMP; must be tied to PGND at IC backside metal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Full-bridge ZVS resonant control | Enables zero-voltage switching on all four MOSFETs, reducing switching losses and EMI in CCFL inverters. |
| Integrated 5.3 V/10 mA LDO | Powers internal circuitry and gate drivers - eliminates need for external bias rail and simplifies BOM. |
| Adjustable lamp current rise/fall time | Set via external capacitor on COMP pin - ensures smooth DPWM transitions and avoids lamp flicker. |
| Secondary voltage limiting | 2.3 V VFB threshold with 1200 µA COMP discharge current - protects transformer insulation during strike/open-lamp faults. |
| Lamp-out detection with timeout | IFB <600 mV for programmable duration (via TFLT capacitor) - prevents uncontrolled high-voltage stress during lamp failure. |
| Input-voltage feed-forward | Compensates line variations in real time - maintains constant lamp current and brightness across 4.6–28 V input range. |
Applications
| Notebook Computer Displays | LCD Monitors |
|---|---|
Use Scenario: Driving CCFL backlights in 10–17 inch TFT-LCD panels with variable input voltage (8–24 V) and ambient temperature ranging -20°C to +70°C. IC Role / Device Role / Timing Role: Full-bridge resonant controller regulating lamp current via IFB feedback and managing DPWM dimming via CNTL voltage. Use Value: Guarantees reliable lamp striking even at low temperatures and extends CCFL lifetime through near-sinusoidal output waveform. |
Use Scenario: Powering dual-tube CCFL arrays in 19–24 inch desktop LCD monitors requiring stable brightness control and fault resilience. IC Role / Device Role / Timing Role: Primary backlight controller implementing lamp-current regulation, secondary overvoltage/overcurrent protection, and synchronized DPWM dimming. Use Value: Reduces transformer stress via VFB-based secondary voltage limiting and enables seamless brightness scaling across 10:1 range without color shift. |
| LCD TVs | Industrial Panel PCs |
Use Scenario: Backlighting 32–42 inch CCFL-based LCD TV modules with high reliability requirements and extended operating life. IC Role / Device Role / Timing Role: Resonant inverter controller with dual fault timers (lamp-out and ISEC overcurrent), feed-forward line regulation, and soft-start sequencing. Use Value: Achieves >50,000-hour lamp life by minimizing harmonic content and maintaining tight current regulation across input and temperature variation. |
Use Scenario: Embedded display subsystems in factory HMIs and medical displays where long-term component availability and thermal robustness are critical. IC Role / Device Role / Timing Role: Industrial-grade CCFL controller with -40°C to +85°C qualification, undervoltage lockout (4.0–4.58 V), and traceable sourcing support. Use Value: Ensures continuous operation in harsh environments via robust fault handling (adjustable timeouts, dual protection paths) and stable 5.3 V bias generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL backlight controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8722AEVG+ | Identical electrical specs and pinout; differs only in tape-and-reel packaging (E24-1 vs. E24-2) and RoHS compliance marking. | No functional difference; suitable for same PCB layout and firmware. | Select MAX8722AEVG+ for automated SMT assembly requiring standard reel packaging. |
| LM3481MM/NOPB | Step-up DC-DC controller (not CCFL-specific); lacks integrated lamp regulation, DPWM dimming, VFB/ISEC protection, and 5.3 V LDO. | Requires external circuitry for CCFL drive (resonant tank, feedback, protection) - significantly higher design complexity. | Choose only if redesigning from scratch with custom topology; not drop-in for MAX8722AEEG+ replacement. |
Compared with MAX8722AEVG+, the MAX8722AEEG+ offers identical functionality in tube packaging, while LM3481MM/NOPB demands full system-level redesign to achieve comparable CCFL control - making MAX8722AEEG+ the optimal choice for cost-sensitive, time-constrained display inverter upgrades.
Availability
MAX8722AEEG+ is available at Aetrix Electronics and suitable for notebook computer displays, LCD monitors, and industrial panel PCs requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX8722AEEG+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, computing, and consumer applications.
The MAX8722AEEG+ belongs to Maxim's CCFL backlight controller product line, engineered specifically for high-efficiency, low-EMI resonant inverters in portable and desktop LCD displays - emphasizing lamp lifetime, striking reliability, and analog-digital hybrid dimming control.
FAQ
What is the function of the TFLT pin on the MAX8722AEEG+?
The TFLT pin on the MAX8722AEEG+ sets the timeout duration for both lamp-out and secondary overcurrent faults via an external capacitor to ground. When IFB falls below 600 mV (lamp-out) or ISEC exceeds 1.21 V (secondary overcurrent), the fault latch activates only after the timeout period elapses - preventing false triggering during transient conditions. The capacitor value directly determines the delay, enabling design flexibility for different lamp types and system response requirements.
Can the MAX8722AEEG+ drive CCFLs without external MOSFETs?
No, the MAX8722AEEG+ does not integrate power switches and requires four external n-channel MOSFETs (NH1, NH2, NL1, NL2) to form the full-bridge inverter. Its GH1, GH2, GL1, and GL2 pins provide gate-driver outputs with 0.3 A peak current capability and on-resistances of 10–37 Ω, but all high-power switching occurs externally - a deliberate design choice to optimize thermal management and support diverse lamp power levels.
How does the MAX8722AEEG+ regulate lamp current during dimming?
The MAX8722AEEG+ regulates lamp current using a transconductance error amplifier that compares full-wave rectified IFB voltage against a 790 mV internal reference. During DPWM dimming, the COMP voltage controls high-side MOSFET on-time; when CNTL voltage decreases, DPWM duty cycle reduces, lowering average lamp power while maintaining constant RMS current per active cycle - ensuring stable light output and avoiding flicker or color shift.
What is the purpose of the VFB and ISEC pins on the MAX8722AEEG+?
VFB monitors transformer secondary voltage via a capacitive divider and triggers COMP discharge when exceeding 2.3 V, limiting peak secondary voltage to protect transformer insulation during lamp strike or open-lamp faults. ISEC senses secondary current through a series resistor and initiates COMP discharge above 1.21 V, providing fast overcurrent shutdown to prevent catastrophic failure - both functions use the same COMP node to coordinate protection responses without external logic.
Does the MAX8722AEEG+ support synchronization to an external clock?
Yes, the MAX8722AEEG+ supports high-frequency synchronization via the SYNC pin: when FREQ is tied to VCC, the DPWM chopping frequency becomes exactly 1/128 of the external SYNC signal frequency (10–50 kHz range). This enables precise timing alignment with system video clocks or noise-sensitive EMI requirements - distinct from the resistor-programmed DPWM mode used for standalone operation.
MAX8722AEEG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Type:
- CCFL Controller
- Frequency:
- 30kHz ~ 80kHz
- Voltage - Supply:
- 4.6V ~ 28V
- Current - Supply:
- 1 mA
- Current - Output Source/Sink:
- -
- Dimming:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QSOP
MAX8722AEEG+ FAQ
1.How can I place an order for MAX8722AEEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8722AEEG+ 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 MAX8722AEEG+ reliable?
The price and inventory of MAX8722AEEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8722AEEG+ is usually 5 days.
3.What payment methods are accepted for MAX8722AEEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8722AEEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8722AEEG+?
MAX8722AEEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8722AEEG+ 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 MAX8722AEEG+?
For technical support, including MAX8722AEEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8722AEEG+ requirements.
6.How does Aetrix verify that MAX8722AEEG+ is sourced from the original manufacturer or authorized distributors?
All MAX8722AEEG+ 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 MAX8722AEEG+ meets industry standards.
7.What is the process for return or replacement of MAX8722AEEG+?
All MAX8722AEEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8722AEEG+, 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 MAX8722AEEG+ part is unused and in its original packaging.
Return procedure for MAX8722AEEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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