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Analog Devices Inc. LT3599EUH#PBF
- Part No.:
- LT3599EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3599EUH#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 120MA 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,467
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Product details
Overview
LT3599EUH#PBF 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 - used in high-brightness TFT LCD backlighting for automotive navigation and notebook displays.
For engineers reviewing the LT3599EUH#PBF datasheet, LT3599EUH#PBF pinout, LT3599EUH#PBF application, or LT3599EUH#PBF equivalent, this page delivers verified specifications including programmable switching frequency (200kHz–2.1MHz), True Color PWM dimming up to 3000:1, open/short LED fault detection, and thermal derating via TSET - all validated for the 32-pin 5mm × 5mm QFN package.
Technical Context
The LT3599EUH#PBF implements constant-frequency peak-current-mode control with an internal 2A NPN power switch and integrated PMOS disconnect switch (VO_SW) for shutdown and PWM dimming. It regulates LED current using four matched current sources referenced to ISET, while output voltage is dynamically regulated by monitoring the lowest LEDx pin voltage among active strings.
It features dual dimming paths: analog dimming via CTRL pin (0–1V, up to 20:1 ratio) and precision PWM dimming via dedicated PWM pin (0.033%–100% duty cycle, 3000:1 ratio). Fault protection includes OPENLED and SHORTLED open-collector flags, programmable UVLO on SHDN/UVLO pin, and thermal current derating triggered when junction temperature exceeds threshold set by TSET resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current per String | Up to 120mA, set by external ISET resistor (e.g., 11kΩ yields 120mA); supports 30–120mA range. |
| Current Matching Accuracy | ±1.5% across all four strings at 100mA - ensures uniform brightness in multi-string backlight systems. |
| Input Voltage Range | 3.1V to 30V - compatible with 12V/24V automotive and industrial supply rails without pre-regulation. |
| Max Output Voltage | 44V - sufficient to drive 10+ white LEDs in series per string under worst-case Vf drift. |
| Switching Frequency | 200kHz to 2.1MHz, set by RT resistor or synchronized to external clock - enables EMI optimization and compact magnetics. |
| PWM Dimming Ratio | Up to 3000:1 (0.033%–100%) - preserves color fidelity across full brightness range in display applications. |
| Junction Temp Range | –40°C to +125°C - qualified for automotive cabin and industrial display environments. |
Pinout & Package
LT3599EUH#PBF is housed in a thermally enhanced 32-pin (5mm × 5mm) plastic QFN package with exposed pad (Pin 33) soldered to PCB ground for optimal thermal dissipation (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | Accepts 3.1V–30V; requires local ceramic bypass capacitor to GND for stability and noise suppression. |
| SW | Internal NPN Switch Collector | Drives external boost inductor; trace area must be minimized to reduce EMI radiation. |
| VOUT | Boost Output Node | Supplies power to all LED strings; connects to Schottky diode anode and output capacitor. |
| LED1–LED4 | LED String Cathode Outputs | Each drives one LED string; internally sourced current; DISABLE4 allows disabling LED4 independently. |
| ISET | LED Current Programming | Resistor to GND sets per-string current (e.g., 13.3kΩ → 99mA); tolerance directly impacts accuracy. |
| PWM | Digital Dimming Control | 0.4V low disables switching and freezes VC; >1V enables operation; supports 100Hz–20kHz PWM signals. |
| CTRL | Analog Dimming Input | 0–1V input linearly scales LED current (ILED ≈ VCTRL × 1330 / RISET); >1V has no effect. |
| TSET | Thermal Derating Threshold | Resistor divider sets junction temperature breakpoint; above threshold, LED current reduces to protect LEDs. |
| FB | Overvoltage Protection Feedback | Monitors VO_SW via resistor divider; triggers OVP at 1.223V reference; used only when all strings are open. |
| OPENLED / SHORTLED | Fault Flag Outputs | Open-collector alerts: OPENLED asserts if any LED string opens; SHORTLED asserts if LEDx shorts to VOUT. |
| SHDN/UVLO | Enable & UVLO Input | 1.36V threshold; 4µA hysteresis current enables precise system-level undervoltage lockout programming. |
| VC | Error Amplifier Output | Connects to external compensation network; controls peak switch current and loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM Dimming | 3000:1 ratio with constant chromaticity - eliminates color shift in high-end display backlighting. |
| Four-String Current Matching | ±1.5% matching ensures luminance uniformity across large-area LCD panels without per-string calibration. |
| Programmable Thermal Derating | TSET pin allows custom LED current vs. temperature curve - extends LED lifetime in thermally constrained enclosures. |
| Integrated Open/Short LED Protection | Dedicated OPENLED and SHORTLED pins provide real-time fault reporting without external sensing circuitry. |
| Regulation with VIN > VOUT | Maintains LED current regulation even when input exceeds output voltage - simplifies system architecture in wide-input designs. |
Applications
| Automotive Navigation Displays | Notebook LCD Backlighting |
|---|---|
|
Use Scenario: TFT LCD backlight in vehicle infotainment systems operating across –40°C to +85°C ambient with 12V/24V battery supply. IC Role / Device Role / Timing Role: Four-channel LED driver providing stable, matched current to parallel LED strings with fault detection and thermal management. Use Value: ±1.5% current matching prevents visible brightness gradients; programmable UVLO avoids brown-out during cold cranking. |
Use Scenario: Slim-profile notebook display requiring high-efficiency, low-EMI backlight driving with deep dimming capability. IC Role / Device Role / Timing Role: Boost converter + current regulator delivering 120mA per string at up to 44V with 3000:1 True Color PWM dimming. Use Value: 2.1MHz max switching frequency enables use of small 4.7µH inductors; QFN package supports compact layout. |
| Industrial Panel Meters | Medical Imaging Displays |
|
Use Scenario: Ruggedized HMI displays in factory automation equipment requiring long-term reliability and fault diagnostics. IC Role / Device Role / Timing Role: LED driver with OPENLED/SHORTLED flag outputs feeding microcontroller GPIO for predictive maintenance logging. Use Value: Real-time fault detection enables automatic backlight fallback or alert generation before complete failure. |
Use Scenario: Diagnostic-grade medical monitors demanding flicker-free, color-accurate illumination across clinical lighting conditions. IC Role / Device Role / Timing Role: Precision current source with <0.1% gain drift over temperature ensuring consistent grayscale rendering. Use Value: Analog dimming (CTRL) + PWM dimming (PWM) coexistence allows hybrid dimming strategies for zero-flicker operation. |
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-output boost LED controller (no integrated switch); requires external MOSFET; supports up to 40V output. | Lacks integrated 2A switch and four-string current sources; needs external current sensing and regulation per string. | Choose when higher efficiency at >1A load or discrete FET selection is required; not drop-in for LT3599EUH#PBF. |
| MAX16820ATL+ | 4-channel boost LED driver with 1.5A switch; fixed 600kHz frequency; ±3% current matching; max 36V output. | Lower current matching accuracy and output voltage headroom; no TSET-based thermal derating or True Color PWM. | Consider for cost-sensitive consumer displays where ±3% matching and 300:1 dimming suffice. |
Compared with LTC3783EFE#PBF and MAX16820ATL+, the LT3599EUH#PBF delivers superior current matching (±1.5% vs ±3%), wider dimming (3000:1 vs 300:1), integrated thermal derating, and higher output voltage (44V vs 36V), making it optimal for premium automotive and medical displays.
Availability
LT3599EUH#PBF is available at Aetrix Electronics and suitable for automotive navigation displays, notebook LCD backlighting, industrial HMIs, and medical imaging systems requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3599EUH#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 full technical and manufacturing continuity for legacy Linear products including the LT3599 family.
The LT3599 product line was designed specifically for high-reliability, multi-string LED backlighting in automotive and industrial displays - emphasizing precision current matching, robust fault protection, and thermal-aware operation.
FAQ
What is the maximum LED string voltage supported by the LT3599EUH#PBF?
The LT3599EUH#PBF supports up to 44V output voltage, enabling it to drive 10+ white LEDs (3.2V typical Vf) in series per string under worst-case forward voltage drift and temperature conditions. This headroom ensures reliable regulation across full operating temperature and input voltage ranges.
How does the LT3599EUH#PBF achieve ±1.5% LED current matching across four strings?
The LT3599EUH#PBF uses laser-trimmed, matched current-source circuitry referenced to a single ISET resistor. All four LED drivers share the same bandgap reference and transconductance stages, minimizing process and temperature-induced mismatches - verified across –40°C to +125°C junction temperature.
Can the LT3599EUH#PBF operate with input voltage higher than output voltage?
Yes, the LT3599EUH#PBF maintains accurate LED current regulation even when VIN exceeds VOUT - a feature enabled by its current-source architecture and feedback loop design. This allows flexible system-level power rail partitioning without requiring VIN to always be lower than the LED string voltage.
What is the purpose of the VO_SW pin on the LT3599EUH#PBF?
The VO_SW pin connects to an internal PMOS switch between VOUT and FB. During PWM dimming or shutdown, this switch disconnects the FB resistor divider from VOUT, preventing capacitor discharge and false OPENLED flag assertion - directly enabling the 3000:1 True Color PWM dimming ratio.
Does the LT3599EUH#PBF support synchronization to an external clock signal?
Yes, the LT3599EUH#PBF includes a SYNC pin that accepts an external clock signal. To synchronize, the RT resistor must be selected to program a free-running frequency ~20% slower than the SYNC frequency - ensuring seamless locking without phase jump or startup instability.
LT3599EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3599EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3599EUH#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 LT3599EUH#PBF reliable?
The price and inventory of LT3599EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3599EUH#PBF is usually 5 days.
3.What payment methods are accepted for LT3599EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3599EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3599EUH#PBF?
LT3599EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3599EUH#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 LT3599EUH#PBF?
For technical support, including LT3599EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3599EUH#PBF requirements.
6.How does Aetrix verify that LT3599EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LT3599EUH#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 LT3599EUH#PBF meets industry standards.
7.What is the process for return or replacement of LT3599EUH#PBF?
All LT3599EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3599EUH#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 LT3599EUH#PBF part is unused and in its original packaging.
Return procedure for LT3599EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3599EUH#PBF Tags
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