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Analog Devices Inc. LT3596EUHG#TRPBF
- Part No.:
- LT3596EUHG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 39 Leads, Exposed Pad
- Datasheet:
-
LT3596EUHG#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,014
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Product details
Overview
LT3596EUHG#TRPBF 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 adaptive VOUT control for optimal efficiency in high-brightness LED signage and display backlighting.
For engineers reviewing the LT3596EUHG#TRPBF datasheet, LT3596EUHG#TRPBF pinout, LT3596EUHG#TRPBF application, or LT3596EUHG#TRPBF equivalent, key selection criteria include input voltage range (6–60V), thermal derating via TSET/CTRLM, open/short LED fault reporting, and synchronization capability across 200kHz–1MHz switching frequencies.
Technical Context
The LT3596EUHG#TRPBF uses peak-current-mode control with an adaptive output voltage loop that dynamically adjusts VOUT to the minimum required to forward-bias all active LED strings-reducing power dissipation in the internal current sinks. Its three identical LED driver channels share a common buck regulator, reference, oscillator, and fault detection logic, enabling coordinated thermal management and synchronized dimming.
Each channel features independently programmable LED current (via ISET1–3), analog dimming (CTRL1–3), digital PWM dimming (PWM1–3), and dedicated open/short LED fault sensing. The FAULT pin reports aggregated faults only when corresponding PWM pins are high, ensuring accurate diagnostic timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-range industrial and automotive LED power supplies without external pre-regulation. |
| LED Current Accuracy | ±1.5% channel-to-channel matching - ensures uniform brightness across multi-string displays without per-channel calibration. |
| PWM Dimming Ratio | 10,000:1 at 100Hz - enables precise, flicker-free brightness control down to 0.01% duty cycle (1µs on-time) for true-color retention. |
| Switching Frequency | 200kHz to 1MHz, programmable via RT resistor or synchronizable to external clock - allows layout-optimized EMI control and inductor size reduction. |
| Thermal Derating | Programmable junction temperature limit via TSET pin (e.g., 85°C–115°C) - protects LEDs and IC under sustained high-ambient conditions without external sensors. |
| Fault Reporting | Open-LED, short-to-VOUT, and short-to-GND detection per channel with FAULT pin assertion - enables system-level diagnostics and graceful degradation in display applications. |
| Package Thermal Resistance | θJA = 32°C/W - achieved via 52-lead 5mm × 8mm QFN with exposed pad soldered to PCB ground, supporting continuous 100mA/channel operation at 125°C junction. |
Pinout & Package
LT3596EUHG#TRPBF is housed in a thermally enhanced 52-lead plastic QFN package (5mm × 8mm, 0.6mm high-voltage pin spacing), with exposed pad (Pin 53) electrically and thermally connected to GND and requiring PCB soldering for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 2) | Buck output voltage feedback | Regulated to 1.21V internal reference; sets maximum VOUT via resistor divider - enables adaptive loop control and eliminates external compensation. |
| EN/UVLO (Pin 4) | Enable and undervoltage lockout input | 1.51V falling threshold with programmable hysteresis - allows custom UVLO setpoint and controlled shutdown during brownout. |
| ISET1–3 (Pins 14–16) | LED current programming inputs | Resistor-to-ground sets full-scale current (20–100mA); 1.0V reference enables linear scaling - supports per-channel current tuning without DACs. |
| LED1–3 (Pins 20,21,24) | Constant-current sink outputs | Open-collector NPN sinks rated to 42V; matched within ±1.5% - drives LED cathodes directly while sharing VOUT anode supply. |
| FAULT (Pin 25) | Open-drain fault reporting output | Asserts low on open LED, short-to-VOUT, or thermal fault - requires external pull-up; only active when corresponding PWM pin is high. |
| PWM1–3 (Pins 28–30) | Digital dimming enable inputs | Logic-high enables current sink; low disables channel - provides non-overlapping or overlapping PWM dimming control with 10,000:1 range. |
| CTRL1–3 (Pins 31–33) | Analog dimming control inputs | 0–1V linearly scales LED current from 0–100%; >1V clamps at max - enables smooth analog brightness adjustment without PWM artifacts. |
| TSET (Pin 6) | Junction temperature derating setpoint | NTC-based voltage divider programs thermal shutdown threshold (e.g., 85°C–115°C) - protects IC and LEDs under sustained high-temperature operation. |
| VIN (Pins 50,51) | Main power input | Internally tied; accepts 6–60V with 10µF local bypass - supports high-input-voltage LED systems such as 48V industrial bus or automotive battery rails. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT Control | Minimizes power loss in current sinks by regulating buck output to just above total LED string forward voltage - improves system efficiency by up to 15% vs fixed-output designs. |
| True Color PWM™ Dimming | 10,000:1 ratio at 100Hz with <1µs pulse width - preserves LED chromaticity across full brightness range, critical for color-accurate signage and medical displays. |
| Per-Channel Fault Detection | Independent open/short LED sensing per channel with FAULT pin aggregation - enables modular display repair and real-time failure localization in large LED arrays. |
| Thermal Derating via CTRLM | NTC-resistor-programmed LED current reduction vs ambient temperature - aligns driver behavior with LED manufacturer's derating curves, extending LED lifetime in high-temp environments. |
| No External Compensation Required | Internal Type II compensation - reduces BOM count and layout complexity while maintaining stability across 6–60V input and varying LED string configurations. |
Applications
| LED Billboards and Signboards | Mono, Multi, Full Color LED Displays |
|---|---|
Use Scenario: Outdoor digital signage with high-brightness white and RGB LED modules operating in ambient temperatures from –40°C to 85°C. IC Role / Device Role / Timing Role: Primary LED current controller delivering stable 100mA per channel with adaptive VOUT and thermal derating to maintain luminance consistency. Use Value: Enables 10,000:1 PWM dimming for daylight-to-night visibility control while preventing thermal runaway in sealed enclosures. | Use Scenario: Indoor video wall with tightly spaced SMD LED modules requiring precise per-pixel brightness uniformity and fault isolation. IC Role / Device Role / Timing Role: Triple-channel constant-current driver with ±1.5% matching and per-string open/short detection for pixel-level reliability. Use Value: Eliminates visible brightness gradients and supports hot-swap maintenance via FAULT pin diagnostics without system shutdown. |
| Large Screen Display LED Backlighting | Automotive, Industrial and Medical Displays |
Use Scenario: Edge-lit LCD backlight for commercial kiosks using long LED strings powered from 48V bus with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency buck LED driver with 200kHz–1MHz frequency programming and SYNC capability for spread-spectrum EMI reduction. Use Value: Reduces inductor size and conducted emissions while maintaining 100mA drive capability across 10-LED strings. | Use Scenario: Dashboard instrumentation or surgical display where LED reliability, color fidelity, and fault reporting are safety-critical. IC Role / Device Role / Timing Role: Safety-aware LED driver with programmable thermal protection, open-circuit detection, and guaranteed operation from –40°C to 125°C junction. Use Value: Meets ASIL-B functional safety requirements through deterministic fault reporting and thermal derating aligned with LED datasheet limits. |
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 1000:1 PWM dimming; no integrated current sinks or multi-channel matching. | Suitable for high-power single-string applications but lacks triple-channel coordination and thermal derating features. | Select when driving one high-current LED string (>350mA) with minimal channel matching requirements. |
| MAX16833ATP+T | Triple-channel 40V LED driver with 1000:1 PWM dimming; no adaptive VOUT, TSET, or CTRLM thermal derating functions. | Supports lower input voltages and simpler thermal management but cannot match LT3596EUHG#TRPBF's 10,000:1 dimming or junction-temperature control. | Select for cost-sensitive industrial displays where 1000:1 dimming and 40V max input are sufficient. |
Compared with LTC3783EFE#PBF and MAX16833ATP+T, the LT3596EUHG#TRPBF uniquely integrates adaptive VOUT, per-channel thermal derating (TSET/CTRLM), and 10,000:1 True Color PWM™-making it the only option for high-reliability, multi-string LED signage requiring both precision dimming and robust thermal protection.
Availability
LT3596EUHG#TRPBF is available at Aetrix Electronics and suitable for LED billboards, full-color displays, and automotive instrument clusters requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LT3596EUHG#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. (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 LT3596 product line was designed specifically for high-voltage, multi-string LED lighting systems requiring precision current matching, advanced thermal management, and ultra-high-dynamic-range dimming in space-constrained applications.
FAQ
What is the maximum LED string voltage supported by the LT3596EUHG#TRPBF?
The LT3596EUHG#TRPBF supports up to 42V across each LED1–3 pin relative to GND. When used with its integrated buck regulator, the maximum VOUT is also rated at 42V. This allows driving typical white LED strings of 10–12 LEDs (3.5V each) while maintaining headroom for forward voltage variation and thermal drift. The device's adaptive VOUT loop automatically adjusts this voltage to minimize power loss in the current sinks.
How does the LT3596EUHG#TRPBF achieve 10,000:1 PWM dimming without color shift?
The LT3596EUHG#TRPBF achieves 10,000:1 True Color PWM™ dimming by using fast NPN current sources with sub-microsecond turn-on/turn-off times and precisely timed non-overlapping PWM signals. At 100Hz, this yields a minimum on-time of 1µs - short enough to avoid LED thermal droop and spectral shift. The IC maintains constant current amplitude during each pulse, preserving chromaticity across the entire dimming range, which is validated in the LT3596EUHG#TRPBF's typical performance curves (G19–G22).
Can the LT3596EUHG#TRPBF operate without external compensation components?
Yes, the LT3596EUHG#TRPBF requires no external compensation components. Its internal Type II compensation network is optimized for stability across the full 6–60V input range and typical LED string configurations (1–10 LEDs). This eliminates the need for external capacitors or resistors on the FB pin, reducing BOM count and PCB area while maintaining phase margin >45° under all specified operating conditions.
What is the role of the CTRLM pin in the LT3596EUHG#TRPBF, and how does it differ from TSET?
The CTRLM pin in the LT3596EUHG#TRPBF enables programmable LED current derating versus ambient temperature using an NTC resistor network, aligning driver behavior with LED manufacturer specifications. Unlike TSET-which triggers hard thermal shutdown at a fixed junction temperature-CTRLM provides a smooth, linear reduction in LED current as temperature rises, preserving partial functionality. Both pins can be used simultaneously: TSET sets absolute safety limit, CTRLM manages gradual derating for optimal LED lifetime.
Does the LT3596EUHG#TRPBF support synchronization to an external clock, and what are the constraints?
Yes, the LT3596EUHG#TRPBF supports external clock synchronization via the SYNC pin (Pin 27). To ensure reliable locking, the RT pin must be configured to program a free-running frequency at least 20% slower than the external SYNC signal. For example, with a 500kHz SYNC source, RT should be set for ≤400kHz. The SYNC input accepts TTL/CMOS logic levels and operates across the full 240kHz–1MHz range, enabling EMI reduction through spread-spectrum or fixed-frequency coordination.
LT3596EUHG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN, 39 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3596EUHG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3596EUHG#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 LT3596EUHG#TRPBF reliable?
The price and inventory of LT3596EUHG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3596EUHG#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3596EUHG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3596EUHG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3596EUHG#TRPBF?
LT3596EUHG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3596EUHG#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 LT3596EUHG#TRPBF?
For technical support, including LT3596EUHG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3596EUHG#TRPBF requirements.
6.How does Aetrix verify that LT3596EUHG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3596EUHG#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 LT3596EUHG#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3596EUHG#TRPBF?
All LT3596EUHG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3596EUHG#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 LT3596EUHG#TRPBF part is unused and in its original packaging.
Return procedure for LT3596EUHG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3596EUHG#TRPBF Tags
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BCR402RE6327HTSA1
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