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Analog Devices Inc. LT3596IUHG#TRPBF
- Part No.:
- LT3596IUHG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 39 Leads, Exposed Pad
- Datasheet:
-
LT3596IUHG#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
LT3596IUHG#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 LT3596IUHG#TRPBF datasheet, LT3596IUHG#TRPBF pinout, LT3596IUHG#TRPBF application, or LT3596IUHG#TRPBF equivalent, key selection criteria include input voltage range (6–60V), thermal derating programmability via TSET/CTRLM, open/short LED fault reporting, and synchronization capability with external clock up to 1MHz.
Technical Context
The LT3596IUHG#TRPBF implements peak-current-mode, constant-frequency buck regulation with an adaptive output voltage loop that dynamically adjusts VOUT to maintain ~1V headroom across LED current sinks-minimizing power dissipation while accommodating forward voltage variation across strings. Its three identical current-sink channels share bias, reference, oscillator, and thermal regulation circuitry but operate independently for PWM and analog dimming control.
It integrates diagnostic functions including open-LED detection (threshold: 0.29V), short-to-VOUT protection (1.2V above GND), and FAULT pin reporting for all fault conditions. Thermal protection is implemented via two complementary methods: fixed-junction-temperature derating (TSET pin, 540mV threshold) and NTC-based ambient-temperature-dependent current reduction (CTRLM pin).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6V to 60V - supports wide-input industrial and automotive LED systems without pre-regulation. |
| Max LED Current per Channel | 100mA - set by external ISET resistor; enables driving 10 white LEDs per string at typical forward voltage. |
| LED Current Matching | ±1.5% - ensures consistent brightness across multi-string displays without manual calibration. |
| PWM Dimming Ratio | 10,000:1 at 100Hz - preserves color fidelity across full brightness range with 1µs minimum pulse width. |
| Switching Frequency Range | 200kHz to 1MHz - adjustable via RT pin resistor; allows optimization of inductor size vs. EMI performance. |
| Thermal Derating Threshold | Programmable via TSET pin (540mV trigger) - enables precise junction temperature limiting (e.g., 85°C–115°C) using resistor divider. |
| Fault Reporting | Open LED, shorted LED (to GND or VOUT), and overtemperature - reported on open-drain FAULT pin with active-low assertion. |
Pinout & Package
LT3596IUHG#TRPBF is housed in a thermally enhanced 52-lead (5mm × 8mm) plastic QFN package with exposed pad (Pin 53) soldered to PCB ground for thermal management. High-voltage pin spacing (0.6mm) supports 60V operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–LED3 (Pins 20,21,24) | Constant-current sink outputs | Each drives one LED string cathode; matched ±1.5%; rated for 42V max VOUT compliance. |
| ISET1–ISET3 (Pins 14,15,16) | LED current programming inputs | Resistor-to-ground sets full-scale current (e.g., 20kΩ = 100mA); linear scaling per datasheet equation. |
| PWM1–PWM3 (Pins 30,29,28) | Digital dimming enable inputs | Logic-high enables current sink; low disables channel; used for 10,000:1 PWM 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 full scale. |
| TSET (Pin 6) & CTRLM (Pin 13) | Thermal regulation inputs | TSET sets fixed junction temp limit; CTRLM accepts NTC-based voltage for ambient-dependent LED current derating. |
| FB (Pin 2) | Buck output voltage feedback | Regulated to 1.21V internal reference; connects to resistor divider from VOUT to set maximum buck output. |
| SYNC (Pin 27) | External clock input | Synchronizes switching frequency to external source; requires RT-programmed frequency ≥20% slower than SYNC signal. |
| FAULT (Pin 25) | Open-drain fault reporting | Asserts low on open LED, shorted LED, or thermal fault; requires external pull-up to positive supply. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT control | Maintains ~1V headroom across current sinks to minimize power loss and maximize efficiency across varying LED VF. |
| True Color PWM™ dimming | 10,000:1 ratio at 100Hz preserves chromaticity and avoids flicker in high-end signage and medical displays. |
| Integrated open/short LED detection | Automatically disables faulty channel and reports via FAULT pin-enables system-level diagnostics without external circuitry. |
| Programmable thermal derating | Two independent methods: fixed-junction (TSET) and ambient-dependent (CTRLM + NTC) - aligns LED drive with manufacturer-recommended derating curves. |
| No external compensation required | Reduces BOM count and layout complexity; simplifies design for industrial display OEMs targeting fast time-to-market. |
Applications
| LED Billboards and Signboards | Mono/Multi/Full-Color LED Displays |
|---|---|
Use Scenario: Outdoor large-format signage requiring high brightness, uniform color, and long-term reliability under variable ambient temperatures. IC Role / Device Role / Timing Role: Primary LED current controller managing three independent RGB or monochrome strings with synchronized PWM dimming. Use Value: ±1.5% current matching ensures pixel-level brightness consistency; adaptive VOUT reduces thermal stress on current sinks during summer operation. | Use Scenario: Indoor video walls and retail displays where accurate color reproduction and flicker-free dimming are critical. IC Role / Device Role / Timing Role: Constant-current driver enabling 10,000:1 True Color PWM dimming across R/G/B channels without hue shift. Use Value: Maintains chromaticity coordinates across full dimming range; FAULT reporting enables real-time pixel failure detection and hot-swap maintenance. |
| Large Screen Display LED Backlighting | Automotive, Industrial and Medical Displays |
Use Scenario: Edge-lit or direct-lit LCD backlights for commercial monitors and digital kiosks requiring local dimming zones. IC Role / Device Role / Timing Role: Multi-channel buck LED driver powering segmented backlight zones with independent analog/PWM control. Use Value: Independent CTRLn/PWMn pins allow hybrid dimming strategies; thermal derating protects LEDs during sustained high-luminance operation. | Use Scenario: Instrument clusters, HUDs, and medical imaging panels demanding high reliability, fault visibility, and extended temperature operation. IC Role / Device Role / Timing Role: Safety-critical LED driver with open/short LED fault reporting and programmable thermal limits compliant with AEC-Q200 stress profiles. Use Value: FAULT pin integration simplifies ASIL-B diagnostic coverage; –40°C to 125°C operating range meets automotive under-hood and industrial control cabinet requirements. |
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-string support. | Best suited for single-string, high-current (up to 3A) applications; lacks 3-channel independence and adaptive VOUT. | Select when driving one high-power LED string with tight thermal constraints and no need for multi-zone control. |
| MAX16833ATL+T | 3-channel, 40V LED driver with 1000:1 PWM dimming; uses external MOSFETs for current sinking; no integrated thermal derating via TSET/CTRLM. | Requires external high-side switches and more passive components; supports lower VIN max but lacks NTC-based ambient derating. | Choose for cost-sensitive designs where board space allows discrete FETs and thermal management is handled externally. |
Compared with LTC3783EFE#PBF and MAX16833ATL+T, the LT3596IUHG#TRPBF uniquely integrates three matched current sinks, adaptive VOUT, dual thermal derating modes, and 10,000:1 PWM-making it optimal for multi-string, high-fidelity display applications requiring minimal external components and robust diagnostics.
Availability
LT3596IUHG#TRPBF is available at Aetrix Electronics and suitable for LED billboards, full-color displays, and automotive instrument cluster lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3596IUHG#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LT® product family, known for precision analog and power management ICs.
The LT3596 belongs to Linear's high-voltage LED driver product line, designed specifically for multi-string, high-brightness display applications demanding accuracy, fault resilience, and thermal intelligence in compact form factors.
FAQ
What is the operating temperature range for the LT3596IUHG#TRPBF?
The LT3596IUHG#TRPBF is specified for continuous operation from –40°C to 125°C junction temperature. This industrial-grade rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, and applies across all guaranteed performance parameters including LED current matching and fault detection thresholds.
How does the adaptive VOUT feature improve efficiency in the LT3596IUHG#TRPBF?
The adaptive VOUT feature in the LT3596IUHG#TRPBF dynamically lowers the buck converter output voltage to maintain approximately 1V headroom across the LED current sinks. This minimizes power dissipation in the internal transistors-especially critical when driving strings with varying forward voltages-and directly increases overall system efficiency without requiring external sensing or control logic.
Can the LT3596IUHG#TRPBF drive more than 10 LEDs per channel?
No-the LT3596IUHG#TRPBF is characterized and specified to drive up to 10 white LEDs per channel assuming typical forward voltage (~3.5V per LED). Driving more than 10 LEDs would exceed the 42V absolute maximum rating on LED1–LED3 pins and violate the VOUT compliance limit; doing so risks permanent damage and invalidates all guaranteed specifications including current matching and thermal protection.
What is the purpose of the CTRLM pin on the LT3596IUHG#TRPBF?
The CTRLM pin on the LT3596IUHG#TRPBF enables ambient-temperature-dependent LED current derating using an external NTC thermistor network. When the CTRLM voltage falls below 1V due to rising temperature, the IC linearly reduces LED current to protect both itself and the connected LEDs-aligning precisely with manufacturer-recommended derating curves for long-term lumen maintenance and reliability.
Does the LT3596IUHG#TRPBF require external compensation components?
No-the LT3596IUHG#TRPBF integrates internal compensation for its buck regulator loop and requires no external capacitors or resistors for stability. This is explicitly stated in the Features list and Applications Information section, reducing BOM count, PCB area, and design validation effort compared to controllers requiring external compensation networks.
LT3596IUHG#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)
LT3596IUHG#TRPBF FAQ
1.How can I place an order for LT3596IUHG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3596IUHG#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 LT3596IUHG#TRPBF reliable?
The price and inventory of LT3596IUHG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3596IUHG#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3596IUHG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3596IUHG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3596IUHG#TRPBF?
LT3596IUHG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3596IUHG#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 LT3596IUHG#TRPBF?
For technical support, including LT3596IUHG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3596IUHG#TRPBF requirements.
6.How does Aetrix verify that LT3596IUHG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3596IUHG#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 LT3596IUHG#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3596IUHG#TRPBF?
All LT3596IUHG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3596IUHG#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 LT3596IUHG#TRPBF part is unused and in its original packaging.
Return procedure for LT3596IUHG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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