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Analog Devices Inc. LT3596EUHG#PBF
- Part No.:
- LT3596EUHG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 39 Leads, Exposed Pad
- Datasheet:
-
LT3596EUHG#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,039
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Product details
Overview
LT3596EUHG#PBF from Analog Devices (formerly Linear Technology) is a 60V step-down LED driver IC with three independent constant-current sink channels, each programmable up to 100mA with ±1.5% matching accuracy. It supports 10,000:1 true-color PWM dimming at 100Hz and analog dimming via CTRL pins, operating across 6V–55V input with adaptive VOUT control for optimal efficiency in high-brightness LED signage and display backlighting.
For engineers reviewing the LT3596EUHG#PBF datasheet, LT3596EUHG#PBF pinout, LT3596EUHG#PBF application, or LT3596EUHG#PBF equivalent, key selection considerations include its 52-lead QFN package with high-voltage pin spacing, programmable thermal derating via TSET/CTRLM, open/short LED fault reporting on FAULT pin, and synchronization capability via SYNC pin - all critical for robust, thermally managed LED system design.
Technical Context
The LT3596EUHG#PBF employs peak-current-mode, constant-frequency buck regulation with an adaptive output voltage loop that dynamically minimizes VOUT to ~1V above the highest LED string forward voltage - reducing power dissipation in internal current sinks. Its three matched NPN-based current sinks operate independently, each controlled by dedicated ISET, PWMn, and CTRLn pins.
Thermal protection is implemented via dual-stage programming: TSET sets a fixed junction temperature threshold (e.g., 85°C–115°C) for linear LED current derating, while CTRLM accepts an NTC-based voltage with negative temperature coefficient to implement manufacturer-specified LED derating curves. Fault detection includes open-LED (≤0.29V), short-to-VOUT (≤1.6V), and short-to-ground (≥15V) conditions, all reported on the open-drain FAULT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 55V - supports wide-range industrial and automotive LED power rails without external pre-regulation. |
| Max LED Current per Channel | 100mA - set precisely via external ISET resistor (e.g., 20kΩ), enabling uniform brightness across multi-string displays. |
| LED Current Matching | ±1.5% - ensures consistent luminance across LED1–LED3 channels in RGB or white-segmented signage. |
| PWM Dimming Ratio | 10,000:1 at 100Hz - delivers flicker-free, color-stable dimming down to 0.01% duty cycle (1µs pulse width). |
| Switching Frequency Range | 200kHz to 1MHz - adjustable via RT pin resistor; enables optimization of inductor size vs. EMI in space-constrained PCB layouts. |
| Thermal Derating Threshold | Programmable via TSET pin (e.g., 540mV = ~85°C) - provides predictable, linear LED current reduction before junction overheating occurs. |
| Fault Reporting | Open LED, short-to-VOUT, short-to-GND, and overtemperature faults asserted on single FAULT pin - simplifies system-level diagnostics. |
Pinout & Package
LT3596EUHG#PBF is housed in a 52-lead, 5mm × 8mm thermally enhanced plastic QFN package (UHG) with exposed pad (Pin 53) soldered to PCB ground for thermal management. High-voltage pin spacing (0.6mm) isolates BOOST, SW, and VIN from low-voltage logic pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–LED3 (Pins 20,21,24) | Constant-current sink outputs | Each drives one LED string cathode; rated for ≤42V VOUT; matched within ±1.5% for uniform brightness. |
| ISET1–ISET3 (Pins 14,15,16) | LED current programming inputs | Resistor-to-ground sets full-scale current (e.g., 20kΩ → 100mA); enables per-channel brightness calibration. |
| PWM1–PWM3 (Pins 30,29,28) | Digital dimming control inputs | Logic-high enables current sink; supports non-overlapping or overlapping PWM for 10,000:1 dimming at 100Hz. |
| CTRL1–CTRL3 (Pins 33,32,31) | Analog dimming control inputs | 0–1V input linearly scales LED current from 0–100%; >1V clamps at max programmed current. |
| TSET (Pin 6) & CTRLM (Pin 13) | Thermal regulation inputs | TSET sets fixed derating threshold; CTRLM accepts NTC-derived voltage for LED-manufacturer-specified derating curves. |
| FAULT (Pin 25) | Open-drain fault reporting output | Asserts low on open LED, short fault, or overtemperature; requires external pull-up for system interrupt signaling. |
| VIN (Pins 50,51), GND (Pin 9 & Exposed Pad 53) | Main power and ground connections | Dual VIN pins reduce trace inductance; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT control | Maintains only ~1V headroom across current sinks - cuts power loss by up to 40% vs. fixed-output buck drivers in multi-LED-string systems. |
| True Color PWM™ dimming | 10,000:1 range at 100Hz with <1µs minimum pulse width - preserves chromaticity and eliminates color shift during deep dimming. |
| Per-channel analog + digital dimming | Independent CTRLn and PWMn pins allow hybrid dimming schemes - e.g., coarse analog adjustment with fine PWM resolution. |
| Integrated open/short LED protection | Detects open strings (≤0.29V) and shorts to VOUT (≤1.6V) or GND (≥15V) - prevents thermal runaway and enables fail-safe display operation. |
| No external compensation required | Internal compensation eliminates need for external RC networks - reduces BOM count and layout sensitivity in production designs. |
Applications
| LED Billboards | Mono/Full-Color Displays |
|---|---|
|
Use Scenario: Outdoor large-format LED billboard with RGB pixel modules requiring uniform brightness and thermal resilience under direct sunlight. IC Role / Device Role / Timing Role: Primary LED current controller delivering matched 100mA per R/G/B channel with adaptive VOUT and programmable thermal derating. Use Value: ±1.5% current matching ensures pixel color consistency; TSET/CTRLM programming prevents LED degradation at ambient >85°C. |
Use Scenario: Indoor full-color video wall using SMD 2020 LEDs with tight grayscale fidelity requirements across 10,000:1 dimming range. IC Role / Device Role / Timing Role: Constant-current sink driver enabling True Color PWM™ dimming at 100Hz with sub-microsecond pulse control. Use Value: 10,000:1 PWM ratio maintains color point stability from 100% to 0.01% brightness - critical for HDR video rendering. |
| Automotive Display Backlighting | Medical Imaging Panel Lighting |
|
Use Scenario: Instrument cluster backlight with 6–48V battery-supplied input and ASIL-B functional safety requirements. IC Role / Device Role / Timing Role: Buck LED driver with open/short LED fault reporting on FAULT pin for diagnostic monitoring. Use Value: FAULT pin assertion on LED failure enables immediate system alert; 6V–55V input range covers cold-crank to load-dump transients. |
Use Scenario: High-precision surgical display requiring flicker-free, calibrated white-light backlight with zero color drift. IC Role / Device Role / Timing Role: Triple-channel current source with analog dimming (CTRLn) for smooth, noise-immune brightness control. Use Value: 0–1V analog dimming provides continuous, EMI-quiet luminance adjustment - avoids PWM-induced interference in sensitive analog circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Single-channel, 60V synchronous buck LED driver with 4000:1 PWM dimming; no integrated current sinks - requires external MOSFETs and sense resistors. | Suited for high-power single-string applications (e.g., automotive headlights); lacks multi-channel matching and adaptive VOUT. | Select when driving >1A strings or needing synchronous rectification; not suitable for multi-string signage requiring channel matching. |
| MAX16833ATP+T | 3-channel, 40V LED driver with 1000:1 PWM dimming; ±3% current matching; no thermal derating or adaptive VOUT features. | Targeted at cost-sensitive consumer displays; limited input voltage and dimming range versus LT3596EUHG#PBF. | Choose for lower-voltage (<40V), lower-precision applications where 1000:1 dimming suffices and thermal protection is handled externally. |
Compared with LTC3783EFE#PBF and MAX16833ATP+T, the LT3596EUHG#PBF uniquely combines triple-channel 100mA sinks with ±1.5% matching, 10,000:1 True Color PWM™, adaptive VOUT, and dual-mode thermal derating - making it the only option qualified for high-reliability, multi-string LED signage demanding both precision and thermal intelligence.
Availability
LT3596EUHG#PBF is available at Aetrix Electronics and suitable for LED billboards, full-color video walls, and automotive display backlighting requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant lead-free packaging.
Supply support for LT3596EUHG#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3596EUHG#PBF belongs to Linear's high-voltage LED driver product line, engineered specifically for thermally demanding, multi-string LED signage and display applications where precision current matching, deep dimming, and intelligent thermal management are mandatory.
FAQ
What is the maximum input voltage rating for the LT3596EUHG#PBF?
The LT3596EUHG#PBF has an absolute maximum input voltage (VIN) rating of 60V. Its operational input range is specified from 6V to 55V, ensuring reliable performance across automotive battery variations, industrial 24V/48V rails, and LED power supplies with transient margins. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
How does the adaptive VOUT feature improve efficiency in the LT3596EUHG#PBF?
The adaptive VOUT feature in the LT3596EUHG#PBF dynamically adjusts the buck regulator output to maintain only ~1V headroom across the LED current sinks. This minimizes power dissipation in the internal NPN transistors - especially critical when driving strings with varying forward voltages - resulting in up to 40% lower thermal load versus fixed-output LED drivers.
Can the LT3596EUHG#PBF drive more than 10 LEDs per channel?
No - the LT3596EUHG#PBF is designed to drive up to 10 LEDs per channel, as confirmed in the datasheet's "Typical Application" section and electrical characteristics. Each channel's current sink is rated for ≤42V VOUT and 100mA, limiting practical string length based on typical white LED VF (~3.2V × 10 = 32V). Exceeding this risks violating the 42V LED pin rating.
What fault conditions does the FAULT pin of the LT3596EUHG#PBF report?
The FAULT pin of the LT3596EUHG#PBF reports four distinct fault conditions: open LED string (voltage ≤0.29V at LEDn), short-to-VOUT (voltage ≤1.6V relative to VOUT), short-to-GND (voltage ≥15V), and overtemperature (junction temperature exceeding TSET threshold). All faults assert the open-drain FAULT pin low when the corresponding PWMn pin is high.
Is the LT3596EUHG#PBF pin-compatible with other variants like LT3596IUHG#PBF?
Yes - the LT3596EUHG#PBF and LT3596IUHG#PBF share identical 52-lead QFN (UHG) packaging, pinout, and electrical functionality. The sole difference is temperature grade: EUHG is specified for –40°C to 125°C operation, while IUHG offers the same range but with extended testing and guaranteed performance across the full range. No PCB changes are required for substitution.
LT3596EUHG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN, 39 Leads, Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 55V
- Voltage - Output:
- -
- Current - Output / Channel:
- 100mA
- Frequency:
- 200kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- Backlight, Signage
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFN (5x8)
LT3596EUHG#PBF FAQ
1.How can I place an order for LT3596EUHG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3596EUHG#PBF 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 LT3596EUHG#PBF reliable?
The price and inventory of LT3596EUHG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3596EUHG#PBF is usually 5 days.
3.What payment methods are accepted for LT3596EUHG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3596EUHG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3596EUHG#PBF?
LT3596EUHG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3596EUHG#PBF 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 LT3596EUHG#PBF?
For technical support, including LT3596EUHG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3596EUHG#PBF requirements.
6.How does Aetrix verify that LT3596EUHG#PBF is sourced from the original manufacturer or authorized distributors?
All LT3596EUHG#PBF 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 LT3596EUHG#PBF meets industry standards.
7.What is the process for return or replacement of LT3596EUHG#PBF?
All LT3596EUHG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3596EUHG#PBF, 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 LT3596EUHG#PBF part is unused and in its original packaging.
Return procedure for LT3596EUHG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3596EUHG#PBF Tags
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