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Analog Devices Inc. LT8500EUHH#TRPBF
- Part No.:
- LT8500EUHH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 56-WFQFN Exposed Pad
- Datasheet:
-
LT8500EUHH#TRPBF.pdf
- Description:
- IC PWM GENERATOR 56-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,550
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Product details
Overview
LT8500EUHH#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 120° phase-shifted operation across three 16-channel banks - all in a 56-pin 6mm × 6mm TLA QFN package rated for –40°C to 125°C junction temperature.
For engineers reviewing the LT8500EUHH#TRPBF datasheet, LT8500EUHH#TRPBF pinout, LT8500EUHH#TRPBF application, or LT8500EUHH#TRPBF equivalent, this page provides verified technical context, real-world timing behavior, diagnostic flag handling (SYNC ERROR/OPENLED), cascaded topology constraints, and design-meaningful specifications - all grounded in the official Rev C datasheet and Analog Devices' validated electrical characteristics.
Technical Context
The LT8500EUHH#TRPBF implements a fully buffered 5-wire serial interface (SDI/SCKI/LDIBLANK/SDO/SCKO) with internal skew balancing and 50MHz SCKI support, enabling frame rates up to 85.5kHz. Its PWM generation relies on a free-running 25MHz PWMCK counter synchronized to LDIBLANK edges, with each of the 48 outputs driven by a dedicated 12-bit PWMRSYNC register updated via command frames.
It integrates dual-function LDIBLANK (latch data input + global blank/reset), on-die 100kΩ OPENLED pull-up, and a correction multiplier that scales incoming 12-bit channel data using programmable 6-bit ±50% correction registers. Diagnostic status - including synchronization error (SYC), open LED fault flags (NOL[48:1]), and phase-shift state (PHS) - is returned in every status frame via SDO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 48 independent PWM outputs, grouped into three 16-channel banks for phase-shifted operation |
| PWM resolution | 12-bit (4096 steps) per channel - enables fine-grained brightness control in LED displays |
| PWM frequency | Up to 6.1kHz at 25MHz PWMCK - matches dynamic backlighting refresh requirements |
| Serial interface | 50MHz TTL/CMOS SCKI with 584-bit frame (48×12-bit PWM + 48×6-bit COR + 8-bit CMD) |
| Correction range | 6-bit (64 steps), ±50% of programmed PWM width - compensates for LED binning or driver mismatch |
| Operating voltage | 3.0V to 5.5V VCC - compatible with standard 3.3V and 5V logic domains |
| Package | 56-pin TLA QFN (6mm × 6mm × 0.78mm), exposed pad (Pin 57) = GND - supports high-density PCB layout |
Pinout & Package
LT8500EUHH#TRPBF uses a 56-lead plastic TLA QFN package (6mm × 6mm, 0.78mm height) with exposed thermal pad (Pin 57 = GND). The package is lead-free and tape-and-reel compatible (#TRPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM[48:1] | PWM output drivers | 48 open-drain CMOS outputs; VOH ≥ 4.0V @ 3mA (VCC = 5V), VOL ≤ 1.0V @ 3mA - directly drive LED anodes or LT3595A inputs |
| SCKI (B12) | Serial clock input | 50MHz max input clock; controls shift register timing and correction multiplier calculation - independent of PWMCK |
| SDI (B14) | Serial data input | Accepts 584-bit command frames (MSB-first); latched on rising SCKI edges - no external framing required |
| LDIBLANK (A28) | Dual-function control input | Rising edge ends frame and executes CMD; >50µs high asserts BLANK (resets all PWMs) - requires precise pulse-width control |
| SDO (A25) | Serial data output | Returns status frame (COR registers, SYC/OLT/PHS flags, NOL[48:1]) synchronously with SCKO - enables daisy-chain readback |
| SCKO (B13) | Serial clock output | Buffered, skew-balanced replica of SCKI - drives next device's SCKI in 5-wire cascade - tDC-SCK ≤ ±0.2ns |
| OPENLED (B11) | Diagnostic status input | Wired-OR open-collector input with 100kΩ internal pull-up; captures LED string fault state per PWMCK edge - used with LT3595A for fault localization |
| PWMCK (A27) | PWM timing clock input | 25MHz max clock source for PWM counter; determines PWM period (4096 cycles = 164µs @ 25MHz) - independent of serial interface clock |
| VCC (A26) | Power supply | 3.0V–5.5V analog/digital rail; requires local 0.1µF bypass capacitor - powers all logic and output drivers |
| GND (Pin 57) | Ground reference | Exposed thermal pad; must be soldered to PCB ground plane - critical for thermal performance (θJC = 5°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| 48-channel phase-shifted PWM | Three 16-channel banks configurable for 120° inter-bank offset - reduces peak current and EMI in large-area LED backlights |
| Cascadable 5-wire interface | Integrated SCKO/SDO skew balancing enables >10-device chains at 50MHz without external buffers - simplifies high-channel-count PCB routing |
| Real-time diagnostic flags | SYNC ERROR (SYC) and OPEN LED (NOL[48:1]) reported in every status frame - enables closed-loop fault detection without host polling overhead |
| Per-channel correction multiplier | 6-bit ±50% correction applied digitally before PWMRSYNC load - compensates for LED forward-voltage variation across panels without firmware intervention |
| Self-test diagnostic mode | Command-triggered OPENLED self-test (CMD = 0x5X) pulses each PWM channel individually - identifies open-circuit LED strings down to individual channel level |
Applications
| Large-Screen LCD Backlighting | Mono-/Full-Color LED Displays |
|---|---|
|
Use Scenario: Dynamic local dimming in 55"+ commercial LCD TVs and digital signage, where brightness must adapt per zone in real time. IC Role / Device Role / Timing Role: Primary PWM controller generating synchronized, phase-shifted 48-channel outputs to drive multiple LT3595A LED drivers. Use Value: Enables 6.1kHz PWM frequency with <50ns propagation delay matching (tPD-PWM = 32–50ns), eliminating visible flicker while supporting fast video frame updates. |
Use Scenario: High-fidelity color mixing in RGB LED video walls, requiring independent intensity control of red, green, and blue subpixels. IC Role / Device Role / Timing Role: Centralized 12-bit PWM generator coordinating 48 channels across three color groups with matched rise/fall times (tR/tF = 12ns). Use Value: 4096-step resolution ensures smooth grayscale transitions; 6-bit correction registers compensate for binning-induced luminance variance between LED lots. |
| LED Billboards & Signboards | Industrial Control & ATE |
|
Use Scenario: Outdoor advertising displays operating under wide temperature (-40°C to 125°C) and high ambient light conditions. IC Role / Device Role / Timing Role: Robust PWM engine with built-in OPENLED fault detection and SYNC ERROR monitoring for unattended operation. Use Value: On-chip 100kΩ OPENLED pull-up and status-frame reporting enable autonomous open-string detection - reducing field service calls by identifying failed zones remotely. |
Use Scenario: Precision intensity control in automated test equipment for optical sensor calibration and LED characterization benches. IC Role / Device Role / Timing Role: Programmable 48-channel waveform generator with deterministic 584-bit frame timing (11.7µs/frame @ 50MHz SCKI). Use Value: Sub-microsecond timing accuracy (tSU-SDI = 3ns, tHD-SDI = 1.75ns) ensures repeatable stimulus delivery - critical for parametric testing of photodiodes and spectrometers. |
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 |
|---|---|---|---|
| TLC5947IPWPR | 24-channel, 12-bit PWM; 30MHz SPI interface; no phase-shift or OPENLED diagnostics | Limited to smaller displays; lacks cascading support and real-time fault reporting | Choose for cost-sensitive, lower-channel-count designs where diagnostic features are non-critical |
| IS31FL3731-QFLS4-TR | 28-channel, 8-bit PWM; I²C interface; integrated current regulation; no serial cascade capability | Targets compact RGB matrix displays; not suitable for high-power backlighting or multi-chip systems | Prefer when board space is constrained and constant-current LED driving is required over voltage-mode PWM |
Compared with TLC5947IPWPR and IS31FL3731-QFLS4-TR, the LT8500EUHH#TRPBF uniquely combines 48-channel count, 50MHz cascadable interface, per-channel correction, and hardware-level OPENLED/SYNC diagnostics - making it the only option qualified for industrial-grade, large-area LED backlighting with zero-touch fault management.
Availability
LT8500EUHH#TRPBF is available at Aetrix Electronics and suitable for large-screen LCD backlighting, mono-/full-color LED displays, LED billboards and signboards, industrial control systems, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for LT8500EUHH#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8500EUHH#TRPBF belongs to ADI's LED lighting control product line, engineered specifically for high-channel-count, high-speed, diagnostic-capable PWM generation in demanding display and signage applications - emphasizing timing precision, thermal robustness, and system-level fault visibility.
FAQ
What is the maximum PWM frequency supported by the LT8500EUHH#TRPBF?
The LT8500EUHH#TRPBF achieves up to 6.1kHz PWM frequency when driven by a 25MHz PWMCK clock (4096-cycle period). This is confirmed in the datasheet's Timing Characteristics table (fPWMCK = 25MHz, tPD-PWM = 32–50ns). The LT8500EUHH#TRPBF does not support higher PWM frequencies without external clock division or frame-rate reduction.
How does the LT8500EUHH#TRPBF handle open LED fault detection?
The LT8500EUHH#TRPBF monitors the OPENLED pin (B11) - an open-collector input with internal 100kΩ pull-up - and reports its state in every status frame. During self-test mode (CMD = 0x5X), it sequentially pulses each PWM channel and captures OPENLED state per channel, returning 48 individual NOL[48:1] flags. This enables precise fault localization when paired with LT3595A drivers.
Can the LT8500EUHH#TRPBF be cascaded with other LT8500 devices?
Yes, the LT8500EUHH#TRPBF supports daisy-chain cascading via its 5-wire interface (SDI/SCKI/LDIBLANK/SDO/SCKO). SCKO provides a skew-balanced clock replica to drive the next device's SCKI, enabling >10-device chains at 50MHz. The datasheet confirms this topology eliminates global clock routing and reduces buffer requirements versus conventional 4-wire schemes.
What is the function of the LDIBLANK pin on the LT8500EUHH#TRPBF?
The LDIBLANK pin (A28) serves two roles: LDI (latch data input) and BLANK (global reset). A rising edge always terminates the current command frame and executes the CMD field. Holding LDIBLANK high >50µs asserts BLANK - turning off all PWM outputs and resetting internal registers. The LT8500EUHH#TRPBF requires strict pulse-width control: <5µs for safe LDI-only operation.
Does the LT8500EUHH#TRPBF require external components for basic operation?
Yes, the LT8500EUHH#TRPBF requires a 0.1µF ceramic capacitor between VCC (A26) and GND (Pin 57) for power supply decoupling. No external pull-ups are needed on SDI, SCKI, or LDIBLANK - all are CMOS-compatible with rail-to-rail thresholds. The OPENLED pin includes an internal 100kΩ pull-up, eliminating the need for an external resistor in standard configurations.
LT8500EUHH#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)
LT8500EUHH#TRPBF FAQ
1.How can I place an order for LT8500EUHH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8500EUHH#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 LT8500EUHH#TRPBF reliable?
The price and inventory of LT8500EUHH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8500EUHH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8500EUHH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8500EUHH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8500EUHH#TRPBF?
LT8500EUHH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8500EUHH#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 LT8500EUHH#TRPBF?
For technical support, including LT8500EUHH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8500EUHH#TRPBF requirements.
6.How does Aetrix verify that LT8500EUHH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8500EUHH#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 LT8500EUHH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8500EUHH#TRPBF?
All LT8500EUHH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8500EUHH#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 LT8500EUHH#TRPBF part is unused and in its original packaging.
Return procedure for LT8500EUHH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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