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Analog Devices Inc. LT3599HFE#TRPBF
- Part No.:
- LT3599HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3599HFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,362
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Product details
Overview
LT3599HFE#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 - used in automotive and industrial TFT LCD backlighting systems.
For engineers reviewing the LT3599HFE#TRPBF datasheet, LT3599HFE#TRPBF pinout, LT3599HFE#TRPBF application, or LT3599HFE#TRPBF equivalent, key selection criteria include guaranteed operation from –40°C to +150°C junction temperature, programmable switching frequency (200kHz–2.1MHz), True Color PWM dimming up to 3000:1, analog dimming up to 20:1, and integrated open/short LED fault detection with dedicated OPENLED/SHORTLED flag pins.
Technical Context
The LT3599HFE#TRPBF implements constant-frequency peak-current-mode control with an internal 2A NPN power switch and separate current-sense paths for each of four LED strings. It regulates LED current using ISET-programmed reference and maintains tight matching via matched internal current sources and feedback architecture.
It features dual dimming control: analog dimming via CTRL pin (0–1V, linear ILED scaling) and high-fidelity PWM dimming via dedicated PWM pin (0.033%–100% duty cycle), with VC pin error amplifier output enabling external compensation and soft-start control via SS pin current source (11µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 30V - supports wide-range automotive and industrial supplies without pre-regulation. |
| Output Voltage Capability | Up to 44V - sufficient for driving 10+ white LEDs in series per string. |
| LED String Current | Programmable 30mA–120mA per string via ISET resistor - enables flexible brightness and thermal design. |
| Current Matching Accuracy | ±1.5% over temperature - ensures uniform luminance across all four LED strings in display applications. |
| Switching Frequency Range | 200kHz to 2.1MHz - adjustable via RT resistor; allows EMI optimization and small external component selection. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| PWM Dimming Ratio | Up to 3000:1 - preserves LED color fidelity during deep dimming in navigation displays. |
Pinout & Package
LT3599HFE#TRPBF is housed in a thermally enhanced 28-pin plastic TSSOP package (5mm × 4.4mm) with exposed pad (Pin 29) soldered to PCB ground for thermal dissipation (θJA = 28°C/W, θJC = 10°C/W). The device operates up to 150°C junction temperature and requires no heatsink in typical 12W backlight designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply connection | Accepts 3.1V–30V; must be locally bypassed with low-ESR ceramic capacitor. |
| SW | Collector of internal 2A NPN switch | Drives external boost inductor; trace area minimized to reduce EMI radiation. |
| VOUT | Boost output node | Supplies all four LED strings; rated for up to 44V continuous operation. |
| LED1–LED4 | Individual string cathode outputs | Each sinks up to 120mA; open-circuit detection threshold at 0.4V. |
| ISET | LED current programming input | Resistor-to-ground sets per-string current (e.g., 13.3kΩ → 99mA). |
| CTRL | Analog dimming control | 0–1V input scales LED current linearly; >1V has no further effect. |
| PWM | Digital dimming enable/disable | High (>1V) enables switching; low (<0.4V) disables with VC state held. |
| SHDN/UVLO | Shutdown and UVLO programming | 1.36V threshold with 4µA hysteresis current; supports resistor-divider UVLO setup. |
| FB | Overvoltage protection feedback | 1.223V reference; used with R1/R2 divider to clamp VOUT when all strings open. |
| VC | Error amplifier output | Drives external compensation network; controls peak switch current limit. |
| SS | Soft-start control | 11µA current source charges external capacitor to ramp VC voltage gradually. |
| RT | Frequency setting | Resistor-to-ground programs switching frequency; also enables SYNC mode. |
| OPENLED | Open-string fault flag | Open-drain output asserted when any LED string voltage < 0.4V. |
| SHORTLED | Short-circuit fault flag | Open-drain output asserted when VOUT–VLEDx > 2.2V (high-side short). |
| DISABLE4 | LED4 disable control | Tie to VREF to disable LED4 string; allows 3-string operation with shared cathode. |
| GND | Analog ground reference | Must connect directly to local ground plane; RT/ISET/TSET resistors referenced here. |
| VREF | 1.227V bandgap reference | Stable 100µA-capable reference; used to bias CTRL, PWM, DISABLE4 when unused. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM dimming | 3000:1 ratio with constant chromaticity - eliminates color shift in automotive TFT displays during night-mode dimming. |
| Integrated open/short LED protection | Dedicated OPENLED and SHORTLED flag pins with latch-on-fault behavior - enables system-level fault logging without MCU polling. |
| Programmable LED current derating | TSET pin accepts temperature-dependent voltage to reduce ILED above user-defined junction temperature - prevents LED thermal runaway. |
| Synchronizable switching frequency | SYNC pin accepts external clock; RT resistor set 20% slower than sync frequency - eliminates beat frequencies in multi-converter systems. |
| Regulation with VIN > VOUT | Maintains LED current even when input exceeds output voltage - supports hybrid supply architectures with backup battery or auxiliary rail. |
| Thermally enhanced TSSOP | 28-pin TSSOP with exposed GND pad and 150°C max junction rating - enables high-power density without QFN reflow complexity. |
Applications
| Automotive Navigation Displays | Industrial TFT Backlighting |
|---|---|
Use Scenario: High-brightness, wide-temperature TFT LCD in vehicle infotainment head units requiring consistent luminance across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Four-channel LED driver providing regulated current to parallel LED strings while monitoring open/short faults in real time. Use Value: ±1.5% current matching ensures uniform screen brightness; 150°C junction rating enables placement near heat-generating SoCs without derating. |
Use Scenario: Factory automation HMI panels operating continuously in uncooled enclosures with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Boost-based LED driver delivering stable 120mA per string with programmable UVLO and thermal derating to extend LED lifetime. Use Value: TSET-controlled current reduction prevents LED degradation at elevated temperatures; SHDN/UVLO hysteresis avoids supply brownout oscillation. |
| Avionics Display Backlighting | Medical Imaging Monitor Lighting |
Use Scenario: DO-160-compliant cockpit display with stringent EMI limits and requirement for fault-flag diagnostics during flight. IC Role / Device Role / Timing Role: Synchronized boost controller with programmable 200kHz–2.1MHz switching and OPENLED/SHORTLED status reporting. Use Value: SYNC pin allows alignment with master clock to suppress conducted emissions; fault flags feed directly to safety monitor circuitry. |
Use Scenario: DICOM-calibrated diagnostic monitors requiring precise grayscale tracking and zero color shift across 0.1–100% brightness range. IC Role / Device Role / Timing Role: High-fidelity LED driver implementing True Color PWM dimming to preserve gamma curve integrity during clinical image review. Use Value: 3000:1 PWM dimming ratio enables sub-1% luminance steps without perceptible hue change - critical for low-contrast lesion detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#TRPBF | Multi-phase synchronous boost controller; no integrated power switch; requires external MOSFETs and gate drivers. | Higher efficiency at >20W; supports >4 strings via phase interleaving; lacks integrated OPENLED/SHORTLED flags. | Select when system demands >90% efficiency at full load and board space permits discrete FET layout. |
| TPS68400RHDR | 4-channel buck-boost LED driver with I²C interface; 36V max output; ±2% current matching; 125°C max junction rating. | Digitally programmable via I²C; includes built-in EEPROM for calibration storage; lower current matching tolerance than LT3599HFE#TRPBF. | Select when firmware-controlled dimming profiles or factory calibration persistence are required. |
Compared with LTC3783EFE#TRPBF and TPS68400RHDR, the LT3599HFE#TRPBF delivers superior current matching (±1.5% vs ±2%), higher junction temperature rating (+150°C vs +125°C), and fully integrated fault flagging - making it optimal for high-reliability analog-controlled backlighting where thermal robustness and luminance uniformity are critical.
Availability
LT3599HFE#TRPBF is available at Aetrix Electronics and suitable for automotive navigation displays, industrial HMIs, and avionics backlighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3599HFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, automotive, industrial, and communications markets.
The LT3599 product line was designed specifically for high-reliability, multi-string LED backlighting in demanding environments - emphasizing thermal resilience, fault visibility, and analog dimming fidelity for display applications where color accuracy and uptime are mission-critical.
FAQ
What is the maximum junction temperature rating for the LT3599HFE#TRPBF?
The LT3599HFE#TRPBF is specified for operation from –40°C to +150°C junction temperature, with a maximum junction temperature (TJMAX) of 150°C. This H-grade variant is uniquely qualified for under-hood automotive and high-ambient industrial applications where standard E- or I-grade versions (125°C TJMAX) would require derating or forced cooling. The LT3599HFE#TRPBF achieves this through enhanced process and packaging validation.
How does the LT3599HFE#TRPBF achieve ±1.5% LED current matching across strings?
The LT3599HFE#TRPBF achieves ±1.5% LED current matching through matched internal current-sense circuitry, precision bandgap references (1.227V FB threshold), and symmetrical routing of LED1–LED4 current paths within the die. Matching is guaranteed over the full –40°C to +150°C junction temperature range and includes effects of process variation, voltage, and temperature - verified by production test and statistical correlation, not just design simulation.
Can the LT3599HFE#TRPBF drive fewer than four LED strings?
Yes, the LT3599HFE#TRPBF supports 1–4 string configurations. To disable LED4, tie the DISABLE4 pin to VREF and connect LED4 pin to LED3 pin. For two-string operation, parallel LED1/LED2 and LED3/LED4 respectively. The device automatically adjusts regulation to the lowest active LED string voltage, maintaining accurate current control and fault detection on remaining strings.
What is the purpose of the VO_SW pin on the LT3599HFE#TRPBF?
The VO_SW pin on the LT3599HFE#TRPBF is the drain of an internal PMOS switch that disconnects the FB resistor divider from VOUT during PWM off-time and shutdown. This prevents discharge of the output capacitor through the feedback network, enabling deeper PWM dimming (down to 0.033%) and reducing quiescent current in shutdown mode. VO_SW must be connected to the FB divider's top node (between R1 and R2) per the datasheet schematic.
Does the LT3599HFE#TRPBF support synchronization to an external clock?
Yes, the LT3599HFE#TRPBF supports frequency synchronization via the SYNC pin. When enabled, the internal oscillator locks to an external clock signal; the RT resistor must be selected to program a free-running frequency ~20% slower than the SYNC frequency to ensure reliable lock. During synchronization, the device maintains all protections, dimming functions, and current regulation performance without degradation.
LT3599HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3599HFE#TRPBF FAQ
1.How can I place an order for LT3599HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3599HFE#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 LT3599HFE#TRPBF reliable?
The price and inventory of LT3599HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3599HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3599HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3599HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3599HFE#TRPBF?
LT3599HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3599HFE#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 LT3599HFE#TRPBF?
For technical support, including LT3599HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3599HFE#TRPBF requirements.
6.How does Aetrix verify that LT3599HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3599HFE#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 LT3599HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3599HFE#TRPBF?
All LT3599HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3599HFE#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 LT3599HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3599HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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