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Analog Devices Inc. LT8500IUHH#TRPBF
- Part No.:
- LT8500IUHH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 56-WFQFN Exposed Pad
- Datasheet:
-
LT8500IUHH#TRPBF.pdf
- Description:
- IC PWM GENERATOR 56-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,460
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Product details
Overview
LT8500IUHH#TRPBF from Analog Devices is a 48-channel, 12-bit PWM generator IC designed for high-precision LED backlighting and display control. It delivers independent 4096-step PWM width resolution per channel, supports 50MHz cascadable serial interface, and enables phase-shifted 120° bank operation across three 16-channel groups-ideal for large-screen LCD dynamic backlighting and full-color LED signage.
For engineers reviewing the LT8500IUHH#TRPBF datasheet, LT8500IUHH#TRPBF pinout, LT8500IUHH#TRPBF application, or LT8500IUHH#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed timing specifications (fSCKI = 50MHz, fPWMCK = 25MHz), real-world diagnostic capabilities (SYNC ERROR/OPENLED flags), and precise package mapping to the 56-pin TLA QFN (6mm × 6mm).
Technical Context
The LT8500IUHH#TRPBF implements a fully buffered 5-wire serial interface (SDI/SCKI/LDIBLANK/SDO/SCKO) with internal skew balancing and 50MHz clock tolerance. Its architecture integrates a 584-bit shift register, 48 independent 6-bit correction multipliers, and a free-running 12-bit PWMCK counter synchronized to external PWMCK input.
Each of the 48 PWM outputs is generated by comparing a programmable 12-bit PWMRSYNC value against the PWMCK counter; output enable/disable, phase-shift toggling (120° inter-bank offset), and open-LED self-test (CMD = 0x5X) are all executed via command frames with deterministic timing-ensuring deterministic frame latency (11.7µs at 50MHz SCKI) and reliable status readback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 48 independent PWM outputs with individual 12-bit (4096-step) resolution |
| PWM Clock Max | 25MHz PWMCK input → 6.1kHz max PWM frequency (4096-cycle period) |
| Serial Interface Speed | 50MHz SCKI → 11.7µs frame time for full 584-bit command/status transfer |
| Correction Range | 6-bit ±50% per-channel correction multiplier (0–63 steps, centered at 32) |
| Phase Shift | Three 16-channel banks configurable to operate 120° out-of-phase to reduce EMI |
| Diagnostic Flags | Dedicated SYNC ERROR and OPENLED status bits reported in every status frame |
| Supply Range | 3.0V to 5.5V VCC - compatible with both 3.3V and 5V logic systems |
Pinout & Package
LT8500IUHH#TRPBF is housed in a 56-pin TLA QFN package (6mm × 6mm × 0.78mm) with exposed thermal pad (Pin 57 = GND). The package supports high-density PCB layout and efficient thermal dissipation in LED driver applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM[48:1] | 48-channel PWM output | Open-drain capable; each driven by comparison of PWMRSYNC[n] vs PWMCK counter |
| OPENLED (B11) | Diagnostic input | Wired-OR fault reporting pin with internal 100kΩ pull-up; captures open-LED state per PWMCK edge |
| SDO (A25) | Serial data output | Shift register output; returns status frame (COR registers, fault flags, command bits) on SCKO edges |
| SCKI (B12) | Serial clock input | 50MHz master clock for SDI frame shifting and correction calculation - independent of PWMCK |
| VCC (A26) | Power supply | 3.0V–5.5V analog/digital supply; requires local bypass capacitor to GND |
| SCKO (B13) | Serial clock output | Buffered pass-through of SCKI; enables cascadable 5-wire topology with skew-balanced routing |
| PWMCK (A27) | PWM timing clock | 25MHz max input; drives free-running 12-bit counter that defines PWM period and output timing |
| SDI (B14) | Serial data input | Receives 584-bit command frames (48×12-bit PWM + 48×6-bit COR + 8-bit CMD) |
| LDIBLANK (A28) | Dual-function control | Rising edge latches command/data; >50µs high asserts BLANK (resets all PWM outputs) |
| GND (Pin 57) | Ground reference | Exposed thermal pad - must be soldered to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| 48-channel 12-bit PWM generation | Enables pixel-level brightness control in large-area LED displays without external DACs or microcontroller overhead |
| 50MHz cascadable 5-wire interface | Eliminates global SCKI routing; allows daisy-chaining >10 devices with balanced SCKO/SDO skew and no buffer insertion |
| Per-channel 6-bit ±50% correction | Compensates for LED forward-voltage variation and driver mismatch across 48 channels without firmware intervention |
| Hardware-based open-LED self-test | Automatically identifies failed LED strings by pulsing each PWM output and sampling OPENLED state - no host CPU involvement |
| 120° phase-shifted bank operation | Reduces peak current demand and conducted EMI by staggering turn-on of 16-channel groups within one PWM period |
| Integrated synchronization error detection | SYC flag alerts host if LDIBLANK violates frame boundary timing - prevents corrupted PWM updates in noisy environments |
Applications
| Large-Screen LCD Backlighting | Full-Color LED Video Signage |
|---|---|
Use Scenario: Dynamic local dimming in 55″+ commercial LCD panels using 48-zone LED backlight arrays. IC Role / Device Role / Timing Role: Primary PWM controller generating synchronized, phase-shifted dimming signals for three LT3595A LED drivers. Use Value: Enables 12-bit grayscale depth per zone and 6.1kHz flicker-free dimming while reducing system EMI through 120° bank interleaving. |
Use Scenario: High-resolution outdoor LED billboards requiring uniform brightness across thousands of RGB pixels. IC Role / Device Role / Timing Role: Centralized PWM timing engine driving 48 parallel LED string controllers with per-string correction calibration. Use Value: Eliminates visible banding via 4096-step resolution and compensates for LED binning drift using hardware correction registers. |
| Industrial LED Inspection Systems | Automated Test Equipment (ATE) Lighting |
Use Scenario: Machine vision lighting rigs with programmable strobe timing and intensity gradients across linear LED arrays. IC Role / Device Role / Timing Role: Precision timing controller synchronizing 48 independent LED zones to camera exposure triggers via LDIBLANK edge detection. Use Value: Achieves sub-microsecond strobe jitter control and real-time intensity ramping using asynchronous update frames and PWMCK-synchronized enable. |
Use Scenario: Functional test fixtures requiring calibrated, repeatable illumination of DUTs under varying spectral conditions. IC Role / Device Role / Timing Role: Calibration-grade PWM source with traceable 12-bit linearity and open-circuit fault detection per channel. Use Value: Reduces test setup time by embedding open-LED diagnostics and correction coefficients directly in hardware - no per-unit firmware tuning needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 48-channel PWM generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947IPWR | 24-channel, 12-bit PWM; 30MHz SPI interface; no phase-shift or OPENLED diagnostic support | Limited to smaller LED arrays; lacks cascading capability and hardware fault reporting | Choose when channel count and diagnostic depth are secondary to cost and footprint |
| IS31FL3731-QFLS4 | 28-channel, 8-bit PWM; I²C interface; integrated current regulation; no correction multiplier or serial cascading | Targeted at low-power RGB indicator applications - not suitable for high-current backlighting | Prefer for space-constrained UI lighting where per-channel current control outweighs resolution and scalability |
Compared with TLC5947IPWR and IS31FL3731-QFLS4, the LT8500IUHH#TRPBF uniquely combines 48-channel 12-bit resolution, 50MHz cascadable interface, hardware-based open-LED diagnostics, and 120° phase-shifting - making it the only option qualified for high-reliability, large-format LED display timing control.
Availability
LT8500IUHH#TRPBF is available at Aetrix Electronics and suitable for large-screen LCD backlighting, full-color LED video signage, and industrial machine vision lighting requiring stable component supply across multi-year production cycles.
Supply support for LT8500IUHH#TRPBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.
The LT8500IUHH#TRPBF belongs to Analog Devices' LED lighting control product line, engineered specifically for high-channel-count, high-resolution PWM timing in demanding display and inspection applications - emphasizing noise immunity, diagnostic integrity, and scalable cascade architecture.
FAQ
What is the maximum PWM frequency supported by the LT8500IUHH#TRPBF?
The LT8500IUHH#TRPBF achieves a maximum PWM frequency of 6.1kHz when driven by a 25MHz PWMCK input signal. This corresponds to a full 4096-cycle period (2¹²), and the frequency scales linearly with PWMCK - e.g., 12.5MHz PWMCK yields ~3.05kHz. The device does not generate the PWMCK signal internally; it must be supplied externally with precise duty cycle and jitter performance.
How does the LT8500IUHH#TRPBF handle open-LED fault detection?
The LT8500IUHH#TRPBF uses its OPENLED pin (B11) to report open-circuit conditions via two modes: passive monitoring (status bit duplicated across all 48 channels) and active self-test (CMD = 0x5X). During self-test, it sequentially pulses each PWM output for 64 PWMCK cycles and samples OPENLED state per channel - returning precise fault location in the status frame without host CPU intervention.
Can the LT8500IUHH#TRPBF be cascaded with other LT8500 devices?
Yes, the LT8500IUHH#TRPBF supports robust cascading via its 5-wire serial interface (SDI/SCKI/LDIBLANK/SDO/SCKO). SCKO provides a buffered, skew-balanced copy of SCKI to drive the next device's SCKI input, enabling chains of >10 units at 50MHz without external buffers. The interface guarantees deterministic frame timing and automatic status readback propagation across the chain.
What is the function of the LDIBLANK pin on the LT8500IUHH#TRPBF?
The LDIBLANK pin (A28) serves dual roles: Latch Data In (LDI) and BLANK. A rising edge always triggers LDI - ending the current command frame and executing its CMD field. Holding LDIBLANK high >50µs asserts BLANK, which immediately disables all 48 PWM outputs and resets internal registers. To avoid unintended reset, pulse duration must stay below 5µs for pure LDI operation.
Does the LT8500IUHH#TRPBF require external configuration after power-up?
Yes, the LT8500IUHH#TRPBF remains in reset state after power-up: all PWM outputs are disabled (logic low) until explicitly enabled. A minimum four-frame sequence is required - correction register load (CMD = 0x20), PWM value update (CMD = 0x00), then output enable (CMD = 0x30). The PWMCK clock must be active before the enable frame to ensure synchronized startup.
LT8500IUHH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 56-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- PWM Generator
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN (5x9)
LT8500IUHH#TRPBF FAQ
1.How can I place an order for LT8500IUHH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8500IUHH#TRPBF 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 LT8500IUHH#TRPBF reliable?
The price and inventory of LT8500IUHH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8500IUHH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8500IUHH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8500IUHH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8500IUHH#TRPBF?
LT8500IUHH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8500IUHH#TRPBF 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 LT8500IUHH#TRPBF?
For technical support, including LT8500IUHH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8500IUHH#TRPBF requirements.
6.How does Aetrix verify that LT8500IUHH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8500IUHH#TRPBF 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 LT8500IUHH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8500IUHH#TRPBF?
All LT8500IUHH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8500IUHH#TRPBF, 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 LT8500IUHH#TRPBF part is unused and in its original packaging.
Return procedure for LT8500IUHH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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