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Analog Devices Inc./Maxim Integrated MAX1895EGI
- Part No.:
- MAX1895EGI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Lighting, Ballast Controllers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
MAX1895EGI.pdf
- Description:
- CCFL BACKLIGHT CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:4,647
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Product details
Overview
The MAX1895EGI from Maxim Integrated is a high-efficiency CCFL backlight controller optimized for synchronized full-bridge inverter drive of cold-cathode fluorescent lamps, featuring 4.6V–28V input range, >30:1 dimming capability via combined linear + DPWM control, and integrated 5.3V linear regulator - deployed in notebook computers and automotive LCD displays requiring stable lamp strike and long-life sinusoidal drive.
For engineers reviewing the MAX1895EGI datasheet, MAX1895EGI pinout, MAX1895EGI application, or MAX1895EGI equivalent, this page delivers verified technical context on resonant frequency synchronization, dual-mode (SMBus/analog) brightness interface, transformer secondary voltage limiting, lamp-out protection with 2s timeout, and full-bridge gate-driver output specifications - all confirmed for the MAX1895EGI variant in 28-pin QFN package.
Technical Context
The MAX1895EGI implements synchronized-to-resonant-frequency full-bridge control to generate near-sinusoidal waveforms across 4.6V–28V input, ensuring optimal CCFL strike capability and extended lamp life. Its feed-forward architecture dynamically adjusts high-side switch on-time (tON) in response to input voltage transients, enabling stable operation during battery dropout and AC adapter reconnection.
It integrates two independent closed-loop controls: a current loop (regulated via IFB input, 150mV lamp-out threshold) and a voltage loop (regulated via VFB input, 500mV average secondary limit), both using transconductance amplifiers (GMI/GMV) with dedicated compensation pins (CCI/CCV). The DPWM oscillator is synchronizable via AC signal on MODE pin (32kHz–100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.6V to 28V - supports wide-input portable and automotive power rails without external pre-regulation. |
| Dimming Range | >30:1 - achieved only when combining linear lamp-current control and digital PWM (DPWM) simultaneously. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive display environments. |
| Package | 28-pin QFN (5mm × 5mm) - space-constrained PCB layout compatible with thin-profile LCD backlights. |
| Integrated Regulator | 5.3V linear regulator (VCC) - powers internal circuitry, MOSFET drivers, and DPWM oscillator from BATT input. |
| Lamp Protection | Lamp-out detection with 2s timeout (IFB < 150mV) and transformer secondary voltage limiting (VFB regulated to 500mV avg). |
| Interface Options | SMBus-compatible 2-wire interface (SDA/SCL) + analog voltage control - MAX1895EGI supports both; MAX1995 does not. |
Pinout & Package
MAX1895EGI is housed in a 28-pin QFN package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad. Pin functions are validated per Maxim's official datasheet revision 1 (10/02), including dedicated gate-driver outputs (GH1/GL1/GH2/GL2), dual-loop compensation (CCI/CCV), and dual-mode interface pins (CRF/SDA, CTL/SCL, MODE).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Current-limit threshold adjustment | Sets fixed (200mV) or adjustable (80–430mV) LX-to-GND current limit via resistive divider to REF/VCC. |
| 5 MODE | Interface selection & DPWM sync input | DC level selects SMBus (MODE=VCC), positive analog (MODE=GND), or reverse analog (MODE=REF); AC superimposition synchronizes DPWM frequency. |
| 6 CRF/SDA | Reference input / SMBus data I/O | In analog mode: 2V reference for ADC; in SMBus mode (MAX1895EGI only): open-drain SDA with 0.8V/2.1V logic thresholds. |
| 7 CTL/SCL | Brightness control / SMBus clock input | In analog mode: 0–2V linear brightness control; in SMBus mode: TTL-compatible SCL with 4µs min high/low periods. |
| 14 GL2, 15 GL1, 16 GH1, 21 GH2 | Full-bridge gate-driver outputs | Drive external N-channel MOSFETs; GHx outputs support bootstrap operation (BST1/BST2); RDS(on) ≤ 6Ω @ 100mA. |
| 24 IFB | Lamp current sense input | Regulates average lamp current; fault triggered if voltage drops below 150mV for ≥2 seconds. |
| 22 VFB | Lamp-output feedback sense | Regulates transformer secondary voltage to 500mV avg; prevents overvoltage stress during startup/open-lamp conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronized resonant drive | Ensures zero-voltage switching (ZVS) across full input range, reducing EMI and MOSFET switching losses. |
| Dual-loop protection | Independent current (IFB) and voltage (VFB) regulation loops prevent lamp damage during strike, dimming, and fault conditions. |
| Feed-forward input compensation | Instantly adjusts tON to VBATT changes - eliminates brightness shift during battery voltage sag or adapter reconnection. |
| Three dimming methods | Linear (3:1), DPWM (10:1), or combined (>30:1) - enables precise brightness control across ambient light conditions. |
| SMBus + analog dual interface | Enables system-level digital control (MAX1895EGI only) while retaining legacy analog compatibility for drop-in design reuse. |
Applications
| Automotive LCD Instrument Clusters | Notebook Computer Backlighting |
|---|---|
Use Scenario: Driving CCFL backlights in vehicle instrument panels under wide temperature (-40°C to +85°C) and variable battery voltage (9V–16V). IC Role / Device Role / Timing Role: Full-bridge CCFL controller with feed-forward compensation and lamp-out protection. Use Value: Maintains consistent brightness and reliable lamp strike despite engine cranking voltage dips and thermal cycling. |
Use Scenario: Powering high-brightness CCFL arrays in 12–17 inch laptop displays with dynamic dimming based on ambient light sensors. IC Role / Device Role / Timing Role: Dual-mode (SMBus/analog) brightness controller with synchronized DPWM chopping. Use Value: Achieves >30:1 dimming range while suppressing audible noise through 32–100kHz DPWM frequency selection. |
| Car Navigation Display Modules | Point-of-Sale Terminal LCDs |
Use Scenario: Enabling daylight-readable CCFL backlights in GPS navigation units exposed to solar heating and 12V automotive supply. IC Role / Device Role / Timing Role: Resonant full-bridge driver with transformer secondary voltage limiting (VFB clamp at 500mV). Use Value: Prevents transformer insulation breakdown and extends CCFL lifetime under sustained high-temperature operation. |
Use Scenario: Supporting compact, low-cost retail terminals requiring reliable CCFL backlight control with minimal external components. IC Role / Device Role / Timing Role: Integrated 5.3V linear regulator (VCC) powers internal logic and gate drivers directly from BATT input. Use Value: Eliminates need for external LDO, reducing BOM count and PCB area in cost-sensitive embedded designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL backlight controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1995EGI | No SMBus interface; MODE pin supports analog-only control (GND/REF); identical pinout, package, and electrical specs otherwise. | Used where digital bus control is unnecessary and cost reduction is prioritized over interface flexibility. | Select MAX1995EGI only if SMBus functionality is unused - avoids software overhead and simplifies firmware. |
| LM3481MM/NOPB | Boost controller (not full-bridge CCFL-specific); requires external gate drivers, resonant tank tuning, and separate protection logic. | Applicable in custom-designed CCFL inverters where discrete control and layout flexibility outweigh integration benefits. | Choose LM3481MM/NOPB only for highly customized topologies needing adjustable frequency and external MOSFET selection. |
Compared with MAX1995EGI, the MAX1895EGI adds SMBus programmability without sacrificing analog compatibility or protection features; versus LM3481MM/NOPB, it delivers complete CCFL-specific control with integrated gate drivers, dual-loop regulation, and fault handling - reducing design risk and time-to-market.
Availability
MAX1895EGI is available at Aetrix Electronics and suitable for notebook computers, automotive LCD instrument clusters, and point-of-sale terminals requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for MAX1895EGI 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 ICs for industrial, automotive, and computing applications.
The MAX1895EGI belongs to Maxim's CCFL backlight controller product line, designed specifically for high-reliability, wide-input-range, resonant full-bridge lamp driving in portable and automotive displays - emphasizing lamp longevity, dimming precision, and fault resilience.
FAQ
What is the primary function of the MAX1895EGI?
The MAX1895EGI is a dedicated CCFL backlight controller that drives cold-cathode fluorescent lamps using a synchronized full-bridge inverter architecture. It regulates lamp brightness via linear current control, digital PWM (DPWM), or their combination - delivering >30:1 dimming range while ensuring reliable lamp strike and long operational life. Its integrated 5.3V regulator, dual-loop protection (IFB/VFB), and SMBus/analog interface make it suitable for demanding portable and automotive displays.
Does the MAX1895EGI support SMBus communication?
Yes, the MAX1895EGI supports SMBus-compatible 2-wire communication via pins CRF/SDA (pin 6) and CTL/SCL (pin 7) when MODE (pin 5) is pulled to VCC. This enables digital brightness control, status reporting, and configuration without requiring analog DACs or external microcontroller GPIOs. The MAX1995EGI lacks this capability - confirming SMBus is exclusive to the MAX1895EGI variant.
How does the MAX1895EGI protect against lamp failure?
The MAX1895EGI provides two independent fault protections: lamp-out detection triggers if IFB voltage falls below 150mV for ≥2 seconds, and transformer secondary overvoltage is limited by regulating VFB to 500mV average. Both mechanisms are active during startup and steady-state operation. These protections are implemented in hardware and require no firmware intervention - ensuring fail-safe behavior even in unattended systems using the MAX1895EGI.
What is the role of the MODE pin on the MAX1895EGI?
The MODE pin on the MAX1895EGI serves dual purposes: DC voltage level selects the brightness control interface (VCC = SMBus, GND = positive analog, REF = reverse analog), while superimposed AC signals (32–100kHz) synchronize the internal DPWM oscillator. This pin is critical for configuring both functional mode and timing behavior - and its thresholds (0.6V, 1.4–2.6V, VCC−0.6V) are validated across -40°C to +85°C per the MAX1895EGI datasheet.
Can the MAX1895EGI operate from a 5V supply?
Yes, the MAX1895EGI can operate from a 5V supply when VBATT is connected directly to VCC (bypassing the internal linear regulator), provided VBATT remains ≤5.5V. In this configuration, the internal 5.3V regulator is disabled, and external 5V must power VCC, VDD, and gate drivers. This mode is explicitly supported in the datasheet and maintains full functionality - including DPWM, analog interface, and protection features - for low-voltage embedded systems using the MAX1895EGI.
MAX1895EGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- CCFL Controller
- Frequency:
- 20kHz ~ 300kHz
- Voltage - Supply:
- 4.6V ~ 28V
- Current - Supply:
- 3.2 mA
- Current - Output Source/Sink:
- -
- Dimming:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x5)
MAX1895EGI FAQ
1.How can I place an order for MAX1895EGI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1895EGI 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 MAX1895EGI reliable?
The price and inventory of MAX1895EGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1895EGI is usually 5 days.
3.What payment methods are accepted for MAX1895EGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1895EGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1895EGI?
MAX1895EGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1895EGI 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 MAX1895EGI?
For technical support, including MAX1895EGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1895EGI requirements.
6.How does Aetrix verify that MAX1895EGI is sourced from the original manufacturer or authorized distributors?
All MAX1895EGI 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 MAX1895EGI meets industry standards.
7.What is the process for return or replacement of MAX1895EGI?
All MAX1895EGI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1895EGI, 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 MAX1895EGI part is unused and in its original packaging.
Return procedure for MAX1895EGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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