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Analog Devices Inc./Maxim Integrated MAX8790ETP+TG104
- Part No.:
- MAX8790ETP+TG104
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
MAX8790ETP+TG104.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,552
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Product details
Overview
MAX8790ETP+TG104 from Maxim Integrated is a six-string white LED driver IC for LCD panel backlighting, featuring current-mode step-up control, ±1.5% inter-string current regulation accuracy, 4.5V–26V input range, 20mA fixed or 15–27mA adjustable full-scale LED current, and selectable 500kHz/750kHz/1MHz switching frequency. It drives up to six parallel LED strings with active current balancing in notebook, tablet, and handheld display systems.
For engineers reviewing the MAX8790ETP+TG104 datasheet, MAX8790ETP+TG104 pinout, MAX8790ETP+TG104 application, or MAX8790ETP+TG104 equivalent, this page delivers verified technical context, real-world dimming behavior (100:1 range via DPWM or analog + PLL), fault protection thresholds (OV = 1.23V typ, thermal shutdown at 170°C), package mapping (20-pin 4mm × 4mm TQFN-EP), and validated alternative options for LCD backlight design.
Technical Context
The MAX8790ETP+TG104 integrates a fixed-frequency current-mode step-up controller with cycle-by-cycle current limiting, soft-start, and pulse-skipping at light loads. Its error amplifier regulates output voltage just above the highest enabled FB_ string voltage using LVC feedback, while HVC monitors overvoltage across current sources.
Dimming is implemented via dual-path architecture: direct DPWM toggles the step-up switch and current sources synchronously, while analog dimming uses an internal PLL (capture range 100–500Hz), digital comparator, and 8-bit DAC to linearly scale LED current down to 12.5%, augmented by digital dimming below that to reach 1% average current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 26V - supports wide-input industrial and portable display power rails without external pre-regulation. |
| LED Current Accuracy | ±1.5% between strings - ensures uniform brightness across all six LED strings in large-panel LCD backlights. |
| Full-Scale LED Current | 20mA (default) or 15–27mA (adjustable via ISET resistor) - enables precise luminance tuning and thermal management per panel design. |
| Dimming Range | 100:1 (1% to 100%) - achieved via combined analog (down to 12.5%) and DPWM (below 12.5%) control for flicker-free, high-resolution brightness control. |
| Switching Frequency | 500kHz / 750kHz / 1MHz (selected via OSC pin) - allows trade-off between compact magnetics (1MHz) and peak efficiency (500kHz). |
| Feedback Voltage | 450mV at 20mA - minimizes power loss in current-sense path and improves thermal performance of LED string regulators. |
| Fault Protection | Open/short LED detection, OV shutdown (1.23V threshold), thermal shutdown (170°C), and 65ms fault latch timer - prevents damage during LED failure or overvoltage events. |
Pinout & Package
MAX8790ETP+TG104 is housed in a thermally enhanced, lead-free, 20-pin, 4mm × 4mm thin QFN package with exposed pad (EP) for PCB ground connection and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OSC | Oscillator frequency selection | Tri-level input (GND/float/VCC) sets switching frequency to 500kHz/750kHz/1MHz - directly configures external component size vs. efficiency trade-off. |
| ENA | Analog dimming enable | Logic-high enables PLL-based analog dimming; logic-low selects direct DPWM mode - determines dimming architecture and minimum duty cycle behavior. |
| BRT | Brightness control input | PWM input (100–500Hz in analog mode; >500Hz allowed in DPWM if pulse width ≥50µs) - controls LED current magnitude and dimming linearity. |
| SHDN | Shutdown control | Logic-low (<0.8V) disables internal LDO, current sources, and controller; quiescent current drops to <10µA - enables system-level power gating. |
| FB1–FB6 | LED string cathode current-sink outputs | Open-drain regulated current sinks (up to 27mA each); grounded at startup disables corresponding string - enables flexible string count configuration without hardware change. |
| EXT | External MOSFET gate drive | High-current push-pull output driving N-channel MOSFET gate - decouples power handling from IC, enabling scalable output voltage/current for diverse panel sizes. |
| OV | Overvoltage sense input | Monitors resistive divider from VOUT; trips at 1.23V (typ) to disable step-up switch - protects LEDs and driver during open-circuit or overvoltage faults. |
| ISET | Full-scale LED current setting | Resistor-to-GND sets ILEDmax = 20mA × 100kΩ/RISET (RISET = 74–133kΩ) - provides factory-trimmable or board-level current calibration. |
| FSET / CPLL | PLL frequency and compensation | FSET resistor sets PLL free-running frequency (166–500Hz); CPLL capacitor (0.1µF) stabilizes loop response - ensures synchronized, jitter-free analog dimming. |
Key Features
| Feature | Design Value |
|---|---|
| Active current balancing across six strings | ±1.5% regulation accuracy ensures consistent luminance without external trimming or calibration. |
| Low 450mV FB regulation voltage | Reduces power dissipation in current-source path by >50% vs. typical 1V references, improving thermal margin. |
| Programmable dual-mode dimming | Direct DPWM (no latency, full 100:1) and analog + PLL (linear down to 12.5%, then DPWM augmentation) - supports both flicker-sensitive and resolution-critical applications. |
| Integrated 5V linear regulator (VCC) | Supplies internal logic and external MOSFET gate drive; bypassed with ≥1µF ceramic - eliminates need for external bias supply in most designs. |
| Comprehensive fault protection | Dedicated OV pin, HVC/LVC monitoring, cycle-by-cycle current limit, and thermal shutdown - enables robust operation in unattended display systems. |
Applications
| Backlight for 10–15" Notebook Displays | Tablet Computer LCD Backlight |
|---|---|
|
Use Scenario: Driving 6 parallel strings of 8-series white LEDs in a 13.3" IPS LCD panel powered from a 12V rail. IC Role / Device Role / Timing Role: Six-channel constant-current sink with active balancing, step-up converter control, and synchronized analog dimming via BRT PWM input. Use Value: Delivers uniform brightness across full viewing angle while maintaining 100:1 dimming range and <1.5% inter-string current mismatch at 20mA per string. |
Use Scenario: Backlight solution for 10.1" Android tablet with variable input (7–21V) and requirement for low EMI in handheld form factor. IC Role / Device Role / Timing Role: High-efficiency boost controller with selectable 750kHz switching and integrated PLL for noise-immune analog dimming. Use Value: Enables compact layout with small inductor (4.7µH), reduces conducted EMI vs. 1MHz mode, and maintains flicker-free dimming down to 1% brightness. |
| Industrial Handheld Terminal Display | Subnotebook Embedded Display Module |
|
Use Scenario: Ruggedized handheld terminal operating from 9–26V automotive-grade input with extended temperature range (-40°C to +85°C). IC Role / Device Role / Timing Role: Fault-tolerant LED driver with open/short LED protection, thermal shutdown, and UVLO hysteresis for reliable field operation. Use Value: Prevents catastrophic failure during LED string degradation; latched shutdown with manual reset ensures safe fail-safe behavior in mission-critical UIs. |
Use Scenario: Ultra-thin subnotebook requiring minimal board area and low thermal footprint for dual-display configuration (primary + secondary panel). IC Role / Device Role / Timing Role: Space-optimized 4mm × 4mm TQFN-EP driver with exposed pad for direct thermal coupling to PCB ground plane. Use Value: Achieves 1349mW power dissipation at +70°C ambient, supporting continuous 20mA × 6-string operation without heatsink in constrained chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar six-string white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409MH/NOPB | Single-string buck-boost LED driver; no integrated current balancing or multi-string regulation - requires external current mirrors or ICs for 6-string operation. | Suitable only when paired with discrete current-balancing circuitry; lacks native 100:1 dimming and PLL synchronization. | Choose LM3409MH/NOPB only if system already implements external string matching and requires higher VIN max (42V) or lower cost per string. |
| TPS61165DRVR | Single-channel boost LED driver with I²C interface; supports up to 4 strings via external current sinks - no native 6-string support or ±1.5% matching. | Requires external current-setting resistors and additional ICs for >4 strings; dimming limited to 3000:1 via I²C but lacks analog/DPWM dual-mode flexibility. | Select TPS61165DRVR when digital control and programmable fault thresholds are prioritized over analog dimming fidelity and native six-string integration. |
Compared with LM3409MH/NOPB and TPS61165DRVR, MAX8790ETP+TG104 uniquely integrates six matched current sinks, ±1.5% inter-string accuracy, dual-mode dimming with PLL, and single-chip 6-string solution - eliminating external matching components, reducing BOM count by ≥4 ICs, and guaranteeing uniform backlight performance without calibration.
Availability
MAX8790ETP+TG104 is available at Aetrix Electronics and suitable for notebook displays, tablet computer backlighting, and industrial handheld terminal applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8790ETP+TG104 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 MAX8790A product line was engineered specifically for high-reliability, multi-string LCD backlighting in portable and embedded displays - emphasizing current matching, thermal resilience, and seamless integration with PWM-based brightness control systems.
FAQ
What is the maximum number of LED strings supported by the MAX8790ETP+TG104?
The MAX8790ETP+TG104 supports exactly six independent LED strings via its FB1–FB6 current-sink outputs. Each FB pin functions as a regulated current sink capable of delivering up to 27mA. Unused strings are disabled by grounding the corresponding FB pin at power-up - no additional ICs or external circuitry are required to configure fewer than six strings. The MAX8790ETP+TG104 does not support more than six strings in any configuration.
How does the MAX8790ETP+TG104 achieve 100:1 dimming range?
The MAX8790ETP+TG104 achieves 100:1 dimming through hybrid control: analog dimming provides linear current scaling down to 12.5% using an internal PLL, DAC, and digital comparator; below 12.5%, it seamlessly transitions to direct DPWM mode to extend average current down to 1%. This dual-path method avoids nonlinearity and flicker while maintaining full-range compatibility with standard 100–500Hz PWM inputs. The MAX8790ETP+TG104 implements this entirely on-die without external components.
What is the function of the FSET and CPLL pins on the MAX8790ETP+TG104?
The FSET pin sets the free-running frequency of the internal phase-locked loop (PLL) using a resistor to ground (250kΩ–754kΩ yields 166–500Hz), defining the capture range for BRT PWM input. The CPLL pin connects a 0.1µF ceramic capacitor to ground to stabilize the PLL loop response and ensure jitter-free analog dimming. Together, FSET and CPLL enable synchronized, low-noise brightness control - a core feature distinguishing the MAX8790ETP+TG104 from basic PWM LED drivers.
Can the MAX8790ETP+TG104 operate with input voltages below 5.5V?
Yes - the MAX8790ETP+TG104 supports input voltages from 4.5V to 26V. When VIN ≤ 5.5V, the internal 5V LDO is disabled by connecting VCC to IN, allowing an external 5V supply to power the IC and drive the external MOSFET gate. This configuration is validated in Figure 3 of the datasheet and maintains full functionality including dimming, protection, and current regulation. The MAX8790ETP+TG104's UVLO threshold remains at 4.25V (typ), ensuring reliable startup even at 4.5V.
What package type and thermal characteristics does the MAX8790ETP+TG104 have?
The MAX8790ETP+TG104 uses a 20-pin, 4mm × 4mm thin QFN package with exposed thermal pad (TQFN-EP). At TA = +70°C, its continuous power dissipation is 1349mW, derating at 16.9mW/°C above that temperature. The exposed pad must be soldered to a solid PCB ground plane for effective thermal conduction. Junction temperature is rated to +150°C, and thermal shutdown activates at +170°C - critical for sustained operation in sealed display enclosures where airflow is limited. This package is RoHS-compliant and lead-free.
MAX8790ETP+TG104 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8790ETP+TG104 FAQ
1.How can I place an order for MAX8790ETP+TG104 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8790ETP+TG104 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 MAX8790ETP+TG104 reliable?
The price and inventory of MAX8790ETP+TG104 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8790ETP+TG104 is usually 5 days.
3.What payment methods are accepted for MAX8790ETP+TG104?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8790ETP+TG104 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8790ETP+TG104?
MAX8790ETP+TG104 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8790ETP+TG104 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 MAX8790ETP+TG104?
For technical support, including MAX8790ETP+TG104 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8790ETP+TG104 requirements.
6.How does Aetrix verify that MAX8790ETP+TG104 is sourced from the original manufacturer or authorized distributors?
All MAX8790ETP+TG104 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 MAX8790ETP+TG104 meets industry standards.
7.What is the process for return or replacement of MAX8790ETP+TG104?
All MAX8790ETP+TG104 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8790ETP+TG104, 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 MAX8790ETP+TG104 part is unused and in its original packaging.
Return procedure for MAX8790ETP+TG104:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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