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Analog Devices Inc. LT3599EUH#TRPBF
- Part No.:
- LT3599EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3599EUH#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 120MA 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,630
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Product details
Overview
LT3599EUH#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency 2A step-up DC/DC converter IC designed to drive four independent LED strings at up to 120mA per string with ±1.5% current matching, supporting output voltages up to 44V and input voltages from 3.1V to 30V. It enables True Color PWM dimming up to 3000:1 and analog dimming up to 20:1 in automotive and industrial TFT LCD backlighting systems.
For engineers reviewing the LT3599EUH#TRPBF datasheet, LT3599EUH#TRPBF pinout, LT3599EUH#TRPBF application, or LT3599EUH#TRPBF equivalent, key selection considerations include its 32-pin 5mm × 5mm QFN package, programmable switching frequency (200kHz–2.1MHz), integrated OPENLED/SHORTLED fault detection, ±1.5% LED current matching across temperature, and ability to regulate LED current even when VIN > VOUT.
Technical Context
The LT3599EUH#TRPBF implements constant-frequency peak-current-mode control with an internal 2A NPN power switch and dedicated current-sense architecture for four LED strings. Its feedback loop uses the lowest LED pin voltage (LED1–LED4) for output regulation, while overvoltage protection is enforced via the FB pin and internal PMOS switch (VO_SW) that isolates the divider during PWM off-time.
It integrates dual dimming paths: analog control via the CTRL pin (0–1V, linear ILED scaling) and PWM control via the PWM pin (0.033%–100% duty cycle), with independent fault flagging (OPENLED, SHORTLED) and thermal derating via TSET pin. The SHDN/UVLO pin supports programmable undervoltage lockout with 4µA hysteresis current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED String Current | Up to 120mA per string, set by ISET resistor (11k–44.2kΩ); 99mA typical at RISET = 13.3kΩ |
| Current Matching Accuracy | ±1.5% across all four strings at 100mA, maintained over –40°C to 125°C junction range |
| Input Voltage Range | 3.1V to 30V - supports wide-input industrial and automotive supplies without pre-regulation |
| Output Voltage Capability | Up to 44V - sufficient for driving 10+ white LEDs in series per string |
| Switching Frequency Range | 200kHz to 2.1MHz - adjustable via RT resistor; synchronizable to external clock |
| PWM Dimming Ratio | Up to 3000:1 - enables flicker-free, constant-color dimming down to 0.033% duty cycle |
| Thermal Operating Range | –40°C to 125°C junction - qualified for automotive navigation and industrial display applications |
| Package | 32-pin (5mm × 5mm) QFN with exposed thermal pad - θJA = 34°C/W, optimized for high-power LED driver thermal management |
Pinout & Package
LT3599EUH#TRPBF is housed in a thermally enhanced 32-pin plastic QFN package (5mm × 5mm) with exposed ground pad (Pin 33) requiring soldering to PCB copper for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 3.1V–30V; requires local ceramic bypass capacitor to GND |
| SW | Internal NPN switch collector | Drives external boost inductor; minimize trace area to reduce EMI |
| VOUT | Boost output node | Supplies power to all four LED strings; max 44V rating |
| LED1–LED4 | LED string cathode outputs | Each sources regulated current; DISABLE4 pin allows disabling LED4 |
| ISET | LED current programming input | Resistor to GND sets per-string current (30–120mA) |
| CTRL | Analog dimming control | 0–1V input scales LED current linearly; >1V has no effect |
| PWM | Digital dimming enable | High (>1V) enables switching; low (<0.4V) disables with VC state retention |
| FB | Overvoltage protection feedback | 1.223V reference; used with R1/R2 divider to clamp VOUT when all LEDs open |
| VC | Error amplifier output | Connects to external compensation network; controls peak switch current |
| RT | Frequency programming | Resistor to GND sets switching frequency; also enables SYNC functionality |
| SHDN/UVLO | Enable & UVLO threshold | 1.36V turn-on threshold; 4µA hysteresis enables programmable UVLO with resistor divider |
| OPENLED / SHORTLED | Fault flag outputs | Open-collector alerts: OPENLED asserts if any LED string opens; SHORTLED if LEDx shorts to VOUT |
| TSET | Thermal derating threshold | Internal VPTAT comparator triggers LED current reduction above programmed junction temperature |
| SS | Soft-start control | 11µA current charges external capacitor; controls VC ramp rate and startup inrush |
| GND / Exposed Pad | Analog & thermal ground | Must be soldered to solid PCB ground plane; serves as primary thermal path |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM dimming | 3000:1 ratio with constant LED color - achieved via PWM-controlled switch disable and VC hold |
| Integrated fault protection | Dedicated OPENLED and SHORTLED open-collector flags with automatic string disable on short detection |
| Programmable thermal derating | TSET pin allows precise junction-temperature-based LED current roll-off to extend LED lifetime |
| VIN > VOUT regulation capability | Maintains accurate LED current even when input exceeds output - eliminates need for buck-boost topology |
| Flexible dimming interface | Independent analog (CTRL) and digital (PWM) paths - supports hybrid dimming schemes and system-level control |
| Configurable overvoltage protection | FB-based OVP with VO_SW PMOS isolation - prevents false OPENLED trips during PWM off-time |
Applications
| Automotive TFT LCD Backlighting | Industrial Panel Display Backlighting |
|---|---|
Use Scenario: Driving 4-string white LED arrays in instrument clusters and center-stack displays under 8V–24V battery supply with wide temperature swings. IC Role / Device Role / Timing Role: Primary boost LED driver with integrated current regulation, fault monitoring, and thermal derating. Use Value: ±1.5% current matching ensures uniform brightness across display zones; 125°C junction rating supports under-hood proximity mounting. |
Use Scenario: Powering high-brightness LCD backlights in factory HMIs and medical monitors operating continuously in 0°C–70°C ambient environments. IC Role / Device Role / Timing Role: Constant-current LED controller with programmable UVLO and soft-start for reliable cold-start behavior. Use Value: 3000:1 PWM dimming enables compliance with IEC 62368-1 flicker requirements; OPENLED/SHORTLED flags simplify field diagnostics. |
| Notebook PC LCD Backlighting | Desktop Monitor Backlighting |
Use Scenario: Compact, high-efficiency LED driver for ultrabook displays where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Integrated boost converter + four-channel current sink with minimal external components. Use Value: 5mm × 5mm QFN package reduces footprint vs. TSSOP alternatives; 90% efficiency at 12W minimizes heat generation near sensitive logic. |
Use Scenario: Driving large-area LED backlights in 24–32″ monitors requiring stable current across multiple parallel strings. IC Role / Device Role / Timing Role: Multi-string LED current regulator with programmable maximum output voltage and fault reporting. Use Value: Programmable VOUT limit prevents overvoltage stress on LEDs during startup or open-circuit faults; ISET resistor tuning enables BOM flexibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3599IFE#TRPBF | Same die, 28-pin TSSOP package; θJA = 28°C/W; rated for –40°C to 125°C | Better thermal performance in low-airflow environments but larger footprint and lower power density | Select when PCB layout constraints favor TSSOP or when existing thermal design leverages exposed pad-less packages |
| MAX16822AATA+ | 4-string 100mA boost driver; fixed 600kHz frequency; no TSET or programmable OVP; 20-pin TQFN | Lacks thermal derating, True Color PWM, and OPENLED/SHORTLED flags; lower integration | Choose for cost-sensitive, non-automotive applications where 100mA/string and basic dimming suffice |
Compared with LT3599IFE#TRPBF, the LT3599EUH#TRPBF offers higher power density and superior thermal dissipation in space-constrained designs; versus MAX16822AATA+, it delivers extended dimming range, comprehensive fault protection, and thermal-aware current control essential for premium displays.
Availability
LT3599EUH#TRPBF is available at Aetrix Electronics and suitable for automotive navigation TFT LCD displays, industrial panel display backlighting, and notebook PC LCD backlighting requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3599EUH#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, renowned for precision analog and power management ICs.
The LT3599EUH#TRPBF belongs to Linear's high-performance LED driver product line, engineered specifically for demanding backlight applications requiring tight current matching, robust fault handling, and wide dimming range in automotive and industrial environments.
FAQ
What is the maximum LED string voltage supported by the LT3599EUH#TRPBF?
The LT3599EUH#TRPBF supports up to 44V output voltage, enabling it to drive strings of 10+ white LEDs (typically 3.2–3.6V each) in series per channel. This rating is validated under absolute maximum conditions; recommended design margin keeps VOUT ≤ 40V for reliability. The IC regulates LED current even when VIN exceeds VOUT - a key differentiator from standard boost controllers.
How does the LT3599EUH#TRPBF achieve ±1.5% LED current matching across strings?
The LT3599EUH#TRPBF achieves ±1.5% matching through matched internal current-sense circuitry and shared reference architecture across all four LED channels. Matching is specified over –40°C to 125°C junction temperature and confirmed in production testing. External layout symmetry (matched trace lengths, thermal coupling) further preserves this accuracy in end systems.
Can the LT3599EUH#TRPBF operate with input voltage higher than output voltage?
Yes - the LT3599EUH#TRPBF uniquely maintains accurate LED current regulation even when VIN > VOUT, eliminating the need for buck-boost topologies in variable-input applications. This is enabled by its internal current-source architecture and feedback loop that references LED cathode voltages rather than VOUT directly.
What is the purpose of the VO_SW pin on the LT3599EUH#TRPBF?
The VO_SW pin connects to the drain of an internal PMOS switch that isolates the FB voltage divider from VOUT during PWM off-time and shutdown. This prevents discharge of the output capacitor through the divider, enabling deeper PWM dimming (down to 0.033%) and reducing quiescent current. It also avoids false OPENLED flag assertion during dimming transitions.
How is thermal derating implemented on the LT3599EUH#TRPBF?
Thermal derating is implemented via the TSET pin: an external resistor divider sets a voltage threshold that compares against an internal VPTAT (proportional-to-absolute-temperature) reference. When junction temperature rises and VPTAT exceeds TSET voltage, the IC progressively reduces LED current to protect both itself and the LEDs - programmable from ~50°C to 125°C breakpoint.
LT3599EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- 44V
- Current - Output / Channel:
- 120mA
- Frequency:
- 200kHz ~ 2.1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LT3599EUH#TRPBF FAQ
1.How can I place an order for LT3599EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3599EUH#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 LT3599EUH#TRPBF reliable?
The price and inventory of LT3599EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3599EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3599EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3599EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3599EUH#TRPBF?
LT3599EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3599EUH#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 LT3599EUH#TRPBF?
For technical support, including LT3599EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3599EUH#TRPBF requirements.
6.How does Aetrix verify that LT3599EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3599EUH#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 LT3599EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3599EUH#TRPBF?
All LT3599EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3599EUH#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 LT3599EUH#TRPBF part is unused and in its original packaging.
Return procedure for LT3599EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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