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Analog Devices Inc. LT3599IFE#TRPBF
- Part No.:
- LT3599IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3599IFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,980
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Product details
Overview
LT3599IFE#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 LT3599IFE#TRPBF datasheet, LT3599IFE#TRPBF pinout, LT3599IFE#TRPBF application, or LT3599IFE#TRPBF equivalent, this page delivers verified technical context, real-world dimming performance (3000:1 True Color PWM), thermal derating capability, open/short LED fault detection, and package-specific layout guidance for the 28-pin TSSOP variant.
Technical Context
The LT3599IFE#TRPBF 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 uses dual feedback loops: one regulating output voltage via FB (1.223V reference) and another regulating per-string LED current via ISET-programmed current sources and precision current mirrors.
It supports analog dimming via CTRL pin (0–1V, 0–100% current scaling) and true-color PWM dimming via PWM pin (0.033%–100% duty cycle, 3000:1 ratio), with synchronized switching (via SYNC pin) and programmable frequency (200kHz–2.1MHz via RT resistor). Thermal protection is implemented via TSET pin with junction-temperature-dependent LED current derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED String Count | 4 independent strings, each configurable up to 120mA with matched current regulation |
| Current Matching Accuracy | ±1.5% across all strings at 100mA - ensures uniform brightness in multi-string LCD backlights |
| Input Voltage Range | 3.1V to 30V - supports wide-range automotive (12V/24V) and industrial DC supplies |
| Max Output Voltage | 44V - sufficient for driving 10+ white LEDs in series per string |
| Switch Current Limit | 2.5A typical - protects internal NPN switch and external inductor during transients |
| Dimming Ratio (PWM) | 3000:1 (0.033%–100%) - enables flicker-free, color-stable dimming down to ultra-low brightness |
| Thermal Operating Range | –40°C to +125°C junction - qualified for automotive navigation and industrial display environments |
| Reference Voltage (VREF) | 1.227V ±1.2% - stable bandgap reference used for FB and CTRL biasing |
Pinout & Package
LT3599IFE#TRPBF is packaged in a 28-pin plastic TSSOP (FE package) with exposed pad (Pin 29) soldered to PCB ground for thermal management. θJA = 28°C/W, θJC = 10°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW | Internal NPN switch collector | Connects to boost inductor; high di/dt node requiring minimized trace area to reduce EMI |
| VOUT | Boost output rail | Supplies all four LED strings; must be decoupled with low-ESR ceramic capacitor (≥4.7µF) |
| LED1–LED4 | Per-string cathode current sinks | Each regulates 30–120mA; OPENLED/SHORTLED flags activate on fault conditions |
| ISET | LED current programming input | Resistor to GND sets nominal current (e.g., 13.3kΩ → 99mA); tolerance directly impacts matching |
| PWM | Digital dimming control | 0.4V/1V thresholds enable precise 3000:1 PWM dimming; disables switching when low |
| CTRL | Analog dimming control | 0–1V input linearly scales LED current; >1V has no effect - preserves color fidelity at low brightness |
| SHDN/UVLO | Enable + programmable UVLO | 1.36V threshold with 4µA hysteresis current allows resistor-divider-based input supply lockout |
| TSET | Thermal derating setpoint | Internal VPTAT comparator reduces LED current above programmed junction temperature |
| FB | Overvoltage protection feedback | 1.223V reference; resistor divider from VO_SW sets max regulated VOUT when all strings open |
| VC | Error amplifier output | Drives external compensation network; soft-start current (11µA) charges SS capacitor |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM Dimming | 3000:1 ratio with constant chromaticity - achieved by full-cycle LED current blanking without analog modulation |
| Open/Short LED Fault Detection | Dedicated OPENLED (open-collector) and SHORTLED (open-collector) pins with latched status during PWM low phase |
| Programmable LED Current Derating | TSET pin accepts voltage divider with NTC thermistor to reduce LED current above defined junction temperature |
| Output Disconnect During Shutdown | Internal PMOS (VO_SW) isolates feedback divider from VOUT, preventing capacitor discharge and false OPENLED triggers |
| Synchronizable Switching Frequency | SYNC pin accepts external clock; RT resistor set 20% slower than sync frequency for jitter-free operation |
| Regulation with VIN > VOUT | Continues accurate LED current regulation even when input exceeds output - critical for battery-powered systems during charge cycles |
Applications
| Automotive Navigation Displays | Industrial TFT LCD Backlighting |
|---|---|
|
Use Scenario: Driving 4-string white LED backlight for 7–10 inch automotive infotainment displays operating across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Primary boost LED driver with integrated fault monitoring and thermal derating for ASIL-B compatible lighting subsystems. Use Value: ±1.5% current matching prevents visible brightness gradients; OPENLED/SHORTLED flags enable fail-safe display dimming or warning alerts. |
Use Scenario: Powering high-brightness TFT backlights in factory HMIs, medical monitors, and outdoor kiosks with wide input voltage (12–30V DC). IC Role / Device Role / Timing Role: Constant-current LED controller with programmable UVLO and synchronized switching to reduce EMI in noise-sensitive environments. Use Value: 3000:1 True Color PWM enables smooth dimming under varying ambient light; 44V VOUT supports long LED strings without cascaded stages. |
| Desktop & Notebook LCD Backlight | Avionics Display Lighting |
|
Use Scenario: Compact, high-efficiency backlight solution for thin-profile consumer laptops and all-in-one PCs with dynamic contrast requirements. IC Role / Device Role / Timing Role: Four-channel LED driver with analog + PWM dimming interface compatibility for Intel PWM backlight standards. Use Value: CTRL pin enables seamless integration with system microcontroller DAC outputs; 28-pin TSSOP fits tight board space constraints. |
Use Scenario: Ruggedized LED backlight for cockpit displays requiring DO-160E compliance, extended temperature operation, and fault logging. IC Role / Device Role / Timing Role: Safety-aware LED driver with latched fault flags, thermal foldback, and shutdown-controlled output disconnect. Use Value: Programmable maximum VOUT (via FB divider) prevents overvoltage damage during LED string failure; exposed-pad TSSOP aids conduction cooling. |
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 | 4-string, 100mA max, ±2% matching, 40V max VOUT, no integrated OPENLED/SHORTLED flags | Lacks dedicated fault flag pins; requires external comparators for open/short detection | Choose when lower cost and simpler BOM outweigh need for integrated diagnostics |
| MAX16820ATL+T | 4-string, 120mA max, ±3% matching, 36V max VOUT, 2MHz max frequency, no TSET thermal derating | No junction-temperature-based current derating; limited to commercial temp range (–40°C to +85°C) | Prefer for non-automotive applications where thermal management is handled externally |
Compared with LT3599IFE#TRPBF, LTC3783EFE#TRPBF offers lower integration of fault reporting but similar efficiency and dimming, while MAX16820ATL+T provides comparable current drive but lacks the thermal derating and extended temperature qualification needed for automotive-grade designs.
Availability
LT3599IFE#TRPBF is available at Aetrix Electronics and suitable for automotive navigation displays, industrial HMI backlighting, and avionics display systems requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3599IFE#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 LT3599IFE#TRPBF belongs to Linear's high-reliability LED driver product line, engineered specifically for demanding backlight applications requiring tight current matching, robust fault protection, and wide-temperature operation in safety-critical displays.
FAQ
What is the maximum LED string voltage supported by the LT3599IFE#TRPBF?
The LT3599IFE#TRPBF supports up to 44V output voltage, enabling it to drive up to 10–12 white LEDs (3.2–3.6V VF each) in series per string. This rating is validated under absolute maximum conditions; design margin should maintain VOUT ≤ 40V for sustained reliability. The internal switch and protection circuitry are rated for 45V, ensuring headroom against transients.
How does the LT3599IFE#TRPBF achieve ±1.5% LED current matching across four strings?
The LT3599IFE#TRPBF achieves ±1.5% matching using laser-trimmed current mirrors and matched internal transistor geometries within its LED sink architecture. Matching is specified at 100mA and maintained across –40°C to +125°C junction temperature. External ISET resistor tolerance (±0.5% recommended) and PCB layout symmetry further preserve accuracy in production designs.
Can the LT3599IFE#TRPBF operate with input voltage higher than output voltage?
Yes - the LT3599IFE#TRPBF maintains accurate LED current regulation even when VIN exceeds VOUT, a feature critical for automotive systems where battery voltage (e.g., 13.8V) may exceed the LED string forward voltage during partial-load conditions. This behavior is enabled by its current-mode control architecture and independent current-sink topology per LED string.
What is the role of the VO_SW pin on the LT3599IFE#TRPBF?
The VO_SW pin on the LT3599IFE#TRPBF connects to the drain of an internal PMOS switch that isolates the FB resistor divider from VOUT during PWM off-time and shutdown. This prevents output capacitor discharge through the divider, enabling deeper PWM dimming (down to 0.033%) and eliminating false OPENLED triggers caused by slow VOUT decay.
Does the LT3599IFE#TRPBF support synchronization to an external clock?
Yes - the LT3599IFE#TRPBF features a dedicated SYNC pin that accepts TTL/CMOS-compatible external clock signals. To synchronize, the RT resistor must be selected to program a free-running frequency ~20% slower than the external clock frequency. This ensures deterministic phase alignment and eliminates beat frequencies in multi-converter systems.
LT3599IFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3599IFE#TRPBF FAQ
1.How can I place an order for LT3599IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3599IFE#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 LT3599IFE#TRPBF reliable?
The price and inventory of LT3599IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3599IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3599IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3599IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3599IFE#TRPBF?
LT3599IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3599IFE#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 LT3599IFE#TRPBF?
For technical support, including LT3599IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3599IFE#TRPBF requirements.
6.How does Aetrix verify that LT3599IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3599IFE#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 LT3599IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3599IFE#TRPBF?
All LT3599IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3599IFE#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 LT3599IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3599IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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