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Analog Devices Inc. LT3596IUHG#PBF
- Part No.:
- LT3596IUHG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 39 Leads, Exposed Pad
- Datasheet:
-
LT3596IUHG#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,058
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Product details
Overview
LT3596IUHG#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 adaptive VOUT control for optimal efficiency in high-brightness LED signage and display backlighting.
For engineers reviewing the LT3596IUHG#PBF datasheet, LT3596IUHG#PBF pinout, LT3596IUHG#PBF application, or LT3596IUHG#PBF equivalent, key selection criteria include input voltage range (6–60V), thermal derating via TSET/CTRLM pins, open/short LED fault reporting on FAULT pin, and synchronization capability via SYNC pin.
Technical Context
The LT3596IUHG#PBF employs peak-current-mode, constant-frequency buck regulation with adaptive output voltage control-dynamically adjusting VOUT to maintain ~1V headroom across LED current sinks. Its three identical LED driver channels share a common oscillator, reference, and bias circuitry but operate independently for ISETn-programmed current, PWMn-controlled switching, and CTRLn-based analog dimming.
Thermal protection is implemented via two complementary methods: fixed-junction-temperature derating set by TSET pin voltage (540mV threshold), and NTC-based dynamic LED current reduction via CTRLM pin. Fault detection includes open-LED (≤0.29V), short-to-VOUT (≤1.2V above GND), and short-to-GND (≥10V) conditions-all reported on the open-drain FAULT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6V to 60V - supports wide-input industrial and automotive LED systems without external pre-regulation. |
| LED Current Accuracy | ±1.5% channel-to-channel matching - ensures uniform brightness across multi-string displays. |
| PWM Dimming Ratio | 10,000:1 at 100Hz - enables precise, flicker-free brightness control down to 0.01% duty cycle (1µs pulse width). |
| Switching Frequency | 200kHz to 1MHz, programmable via RT pin or synchronizable to external clock - allows EMI optimization and inductor size trade-offs. |
| Thermal Derating | Programmable via TSET (fixed junction temp) and CTRLM (NTC-based LED temp tracking) - protects both IC and LEDs under ambient or localized heating. |
| Fault Reporting | Open LED, short-to-VOUT, short-to-GND, and over-temperature faults all asserted on single FAULT pin - simplifies system-level diagnostics. |
| Package | 52-lead 5mm × 8mm QFN with exposed thermal pad - delivers θJA = 32°C/W for high-power LED drive in compact layouts. |
Pinout & Package
LT3596IUHG#PBF 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 from VOUT. |
| EN/UVLO (Pin 4) | Enable and undervoltage lockout input | 1.51V falling threshold; resistor divider from VIN programs UVLO hysteresis and shutdown behavior. |
| TSET (Pin 6) | Junction temperature derating trigger | 540mV threshold initiates linear LED current reduction when die temperature exceeds programmed limit. |
| ISET1–3 (Pins 14–16) | LED current programming inputs | Resistor-to-ground sets full-scale current per channel (e.g., 20kΩ = 100mA); ±1.5% matching guaranteed. |
| LED1–3 (Pins 20,21,24) | Constant-current sink outputs | Open-collector NPN sinks up to 100mA each; cathode-connected to LED strings, anodes tied to VOUT. |
| FAULT (Pin 25) | Open-drain fault reporting output | Asserted low during open LED, short fault, or thermal overload; requires external pull-up. |
| PWM1–3 (Pins 30,29,28) | Digital dimming enable inputs | Logic-high enables corresponding LED sink; used for 10,000:1 PWM dimming at 100Hz. |
| CTRL1–3 (Pins 33,32,31) | Analog dimming control inputs | 0–1V linearly scales LED current; >1V holds full current; tied to VREF if unused. |
| VIN (Pins 50,51) | Main power input | High-current input pins (internally bonded); require local 10µF ceramic bypass to GND. |
| GND / Exposed Pad (Pins 9,53) | Power and signal ground | Common return for analog/digital circuits and switching node; exposed pad must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT control | Maintains ~1V headroom across LED current sinks, minimizing power loss in high-string-count applications. |
| True Color PWM™ dimming | 10,000:1 ratio at 100Hz preserves consistent LED chromaticity across full brightness range. |
| Integrated thermal protection | Dual-path derating: fixed-junction (TSET) and LED-temperature-tracked (CTRLM with NTC) for robust system reliability. |
| No external compensation required | Internal loop compensation eliminates need for external RC networks, reducing BOM count and layout complexity. |
| Comprehensive fault detection | Single FAULT pin reports open LED, short-to-VOUT, short-to-GND, and over-temperature events with no additional circuitry. |
Applications
| LED Billboards & Signage | Mono/Multi-Color Display Panels |
|---|---|
Use Scenario: Outdoor large-format LED video walls requiring uniform brightness and long-term thermal stability under variable ambient conditions. IC Role / Device Role / Timing Role: Primary LED current controller delivering synchronized, dimmable drive to RGB sub-pixels across thousands of modules. Use Value: ±1.5% current matching ensures pixel-level color consistency; adaptive VOUT reduces heat generation in densely packed cabinets. | Use Scenario: Indoor commercial displays using discrete red/green/blue LED strings per pixel for high-resolution static or animated content. IC Role / Device Role / Timing Role: Triple-channel constant-current sink enabling independent analog or PWM dimming per color channel. Use Value: 10,000:1 PWM dimming preserves color fidelity at low brightness; FAULT pin simplifies module-level failure isolation. |
| Automotive Display Backlighting | Industrial HMI & Medical Displays |
Use Scenario: Dashboard and infotainment displays operating across –40°C to +125°C ambient with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: High-voltage buck LED driver powering white LED edge-lit LCD backlights with thermal derating for engine bay proximity. Use Value: 60V VIN rating tolerates load-dump transients; TSET/CTRLM dual thermal protection meets AEC-Q100-relevant robustness needs. | Use Scenario: Critical-use medical monitors and factory HMIs where LED failure must be detected and reported before safety-critical luminance degradation. IC Role / Device Role / Timing Role: Fault-aware LED driver providing real-time open/short detection and reporting to host microcontroller via FAULT pin. Use Value: Open-LED detection at ≤0.29V and short-to-VOUT detection at ≤1.2V enable early-warning diagnostics without external sense circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3596EUHG#PBF | Same silicon, rated for 0°C to 125°C junction temperature (vs. –40°C to 125°C for LT3596IUHG#PBF). | Suitable for commercial-grade indoor displays; not qualified for extended cold-start environments. | Select LT3596IUHG#PBF for industrial/automotive applications requiring guaranteed operation at –40°C. |
| LT3761EFE#PBF | Single-channel 60V LED driver with 1000:1 PWM dimming; lacks multi-channel matching and adaptive VOUT. | Used where per-string control is unnecessary and cost-per-channel is prioritized over uniformity. | Choose LT3596IUHG#PBF when triple-channel synchronization, ±1.5% matching, or adaptive efficiency are required. |
Compared with LT3596EUHG#PBF, the LT3596IUHG#PBF extends guaranteed operation to –40°C ambient, making it suitable for outdoor or automotive deployments; versus LT3761EFE#PBF, it provides integrated three-channel coordination, superior dimming resolution, and automatic VOUT optimization-reducing thermal stress and improving system-level efficacy.
Availability
LT3596IUHG#PBF is available at Aetrix Electronics and suitable for LED billboards, automotive display backlighting, and industrial HMI applications requiring stable component supply, extended temperature operation, and high-reliability fault reporting.
Supply support for LT3596IUHG#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 acquired Linear Technology in 2017 and maintains its legacy precision analog and power management product lines with full technical and manufacturing continuity.
The LT3596IUHG#PBF belongs to Linear's high-voltage LED driver family, designed specifically for multi-string, high-brightness signage and display applications demanding tight current matching, wide dimming range, and robust thermal/fault management.
FAQ
What is the operating temperature range for the LT3596IUHG#PBF?
The LT3596IUHG#PBF is specified for operation from –40°C to +125°C junction temperature. This extended industrial grade rating ensures reliable performance in automotive dashboard displays, outdoor LED signage, and industrial HMIs exposed to wide ambient swings. All electrical characteristics-including ±1.5% LED current matching and 10,000:1 PWM dimming-are guaranteed across this full range. The LT3596IUHG#PBF uses the same die as the LT3596EUHG#PBF but undergoes additional characterization and screening to validate performance at the lower extreme.
How does the LT3596IUHG#PBF achieve 10,000:1 PWM dimming?
The LT3596IUHG#PBF achieves 10,000:1 PWM dimming at 100Hz by supporting minimum on-times as short as 1µs while maintaining precise current regulation during ultra-narrow pulses. Its fast NPN current sinks and optimized gate drive enable clean turn-on/turn-off transitions without current overshoot or droop. The PWM1–3 pins accept logic-level signals directly; no external level-shifting is needed. This capability is validated in the LT3596IUHG#PBF datasheet Figure 3596 G19 and is fully functional across the –40°C to +125°C temperature range.
Can the LT3596IUHG#PBF drive more than 10 LEDs per string?
No-the LT3596IUHG#PBF is designed to drive up to 10 LEDs per string, as confirmed by Linear Technology's typical application circuits and thermal limits. While the absolute maximum LED pin voltage is 42V (supporting ~12 white LEDs at 3.5V VF), the recommended configuration in the datasheet (Figure 3596 TA01a) specifies eight white LEDs per channel at 48V input. Driving more than 10 LEDs increases forward voltage drop, raising power dissipation in the internal current sinks and potentially exceeding thermal limits-especially at high ambient temperatures or high PWM duty cycles. For higher LED counts, consider cascading or using higher-VF LEDs.
What is the purpose of the CTRLM pin on the LT3596IUHG#PBF?
The CTRLM pin on the LT3596IUHG#PBF enables LED-temperature-tracked current derating using an external NTC thermistor network. Unlike the fixed-junction TSET pin, CTRLM accepts a voltage with negative temperature coefficient-typically generated by an NTC resistor divider from VREF-to reduce LED current as ambient or LED temperature rises. This protects LEDs per manufacturer derating curves and extends lifetime in thermally constrained enclosures. If unused, CTRLM must be tied to VREF; leaving it floating may cause unpredictable dimming or fault behavior.
Does the LT3596IUHG#PBF require external compensation components?
No-the LT3596IUHG#PBF integrates full loop compensation and requires no external RC networks on the FB pin. Its internal compensation is optimized for stability across the full 200kHz–1MHz switching frequency range and typical output capacitor values (4.7–22µF). This eliminates design iterations related to phase margin tuning and reduces PCB area and BOM cost. The datasheet confirms "requires no external compensation" in the Features section and shows stable operation in all typical application schematics without added compensation parts.
LT3596IUHG#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)
LT3596IUHG#PBF FAQ
1.How can I place an order for LT3596IUHG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3596IUHG#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 LT3596IUHG#PBF reliable?
The price and inventory of LT3596IUHG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3596IUHG#PBF is usually 5 days.
3.What payment methods are accepted for LT3596IUHG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3596IUHG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3596IUHG#PBF?
LT3596IUHG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3596IUHG#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 LT3596IUHG#PBF?
For technical support, including LT3596IUHG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3596IUHG#PBF requirements.
6.How does Aetrix verify that LT3596IUHG#PBF is sourced from the original manufacturer or authorized distributors?
All LT3596IUHG#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 LT3596IUHG#PBF meets industry standards.
7.What is the process for return or replacement of LT3596IUHG#PBF?
All LT3596IUHG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3596IUHG#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 LT3596IUHG#PBF part is unused and in its original packaging.
Return procedure for LT3596IUHG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3596IUHG#PBF Tags
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