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Analog Devices Inc. LT3599EFE#TRPBF
- Part No.:
- LT3599EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3599EFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:947
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Product details
Overview
LT3599EFE#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 LT3599EFE#TRPBF datasheet, LT3599EFE#TRPBF pinout, LT3599EFE#TRPBF application, or LT3599EFE#TRPBF equivalent, key selection criteria include its 200kHz–2.1MHz programmable switching frequency, True Color PWM dimming up to 3000:1, analog dimming up to 20:1, open/short LED fault detection, and thermal derating via TSET pin - all critical for high-reliability display power design.
Technical Context
The LT3599EFE#TRPBF implements constant-frequency peak-current-mode control with an internal 2A NPN power switch and integrated PMOS disconnect switch (VO_SW) for PWM-controlled output disconnection. It uses separate feedback paths for LED string voltage regulation and overvoltage protection via FB and VO_SW pins.
Its architecture supports simultaneous analog dimming (via CTRL pin, 0–1V) and PWM dimming (via dedicated PWM pin), with independent fault flags (OPENLED, SHORTLED) and programmable LED current derating versus junction temperature using the TSET pin and external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 30V - enables direct operation from 12V/24V automotive or industrial rails without pre-regulation. |
| Output Voltage Max | 44V - sufficient to drive four series-connected white LEDs (≈10V each) with margin for diode drop and ripple. |
| LED Current per String | Up to 120mA - set by ISET resistor (11kΩ for 120mA); supports 30–120mA range via external resistor selection. |
| Current Matching | ±1.5% - ensures uniform brightness across four LED strings without external calibration. |
| Switching Frequency | 200kHz to 2.1MHz - adjustable via RT pin resistor; allows EMI optimization and compact magnetics selection. |
| PWM Dimming Ratio | Up to 3000:1 - enables true-color dimming down to 0.033% duty cycle at 100Hz, preserving chromaticity. |
| Analog Dimming Ratio | 20:1 - achieved by varying CTRL pin voltage from 0V to 1V; trades off color accuracy for simplicity. |
| Thermal Derating Support | Yes - via TSET pin; internal VPTAT threshold compares against externally set voltage to reduce LED current above breakpoint. |
Pinout & Package
LT3599EFE#TRPBF is packaged in a 28-pin plastic TSSOP (FE package) with exposed pad (Pin 29) soldered to PCB ground for thermal performance. θJA = 28°C/W, θJC = 10°C/W, rated for –40°C to +125°C junction temperature.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW | Internal NPN switch collector | Connects to inductor; high dv/dt node requiring minimal trace area to limit EMI. |
| VOUT | Boost output rail | Supplies all four LED strings; must be bypassed with low-ESR ceramic capacitor. |
| LED1–LED4 | LED string cathode outputs | Each drives one string's cathode; OPENLED/SHORTLED flags monitor these nodes. |
| DISABLE4 | LED4 enable/disable control | Tie to VREF to disable LED4; allows 3-string operation with LED4 pin connected to LED3. |
| PWM | Digital dimming control input | High (>1V) enables switching; low (<0.4V) disables switching while holding VC state for fast recovery. |
| CTRL | Analog dimming control | 0–1V input sets LED current proportionally; >1V has no effect; requires local decoupling. |
| ISET | LED current programming | Resistor to GND sets nominal current (e.g., 11kΩ → 120mA); tolerance directly impacts accuracy. |
| RT | Frequency programming | Resistor to GND sets switching frequency; also used for SYNC mode (set 20% slower than external clock). |
| FB | Overvoltage protection feedback | Monitors VO_SW via resistor divider; triggers OVP when VFB > 1.223V during open-string condition. |
| SHDN/UVLO | Enable + programmable UVLO | 1.36V threshold with 4µA hysteresis current; supports resistor-divider-based system-level undervoltage lockout. |
| VC | Error amplifier output | Connects to external compensation network; controls peak switch current and loop stability. |
| SS | Soft-start control | 11µA internal current charges external capacitor; limits dVVC/dt and prevents inrush. |
| OPENLED | Open-string fault flag | Open-drain output pulled low if any LED string voltage < 0.3V; requires external pull-up. |
| SHORTLED | Short-to-VOUT fault flag | Open-drain output pulled low if VOUT–VLEDx < 0.8V; indicates high-side short on that string. |
| VREF | 1.227V bandgap reference | Stable 100µA-capable reference; used to bias CTRL, DISABLE4, PWM, and TSET when unused. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM dimming | 3000:1 ratio with constant chromaticity - achieved by full-cycle current blanking and VC state hold during PWM off-time. |
| Four-string current matching | ±1.5% matching across temperature and line - enabled by matched internal current sources and shared reference. |
| Programmable LED current derating | Configurable thermal foldback via TSET pin - protects LEDs by reducing current above user-defined junction temperature. |
| Integrated open/short LED protection | Dedicated OPENLED and SHORTLED flags with latched status - simplifies fault diagnostics without MCU polling. |
| Regulation with VIN > VOUT | Maintains LED current even when input exceeds output - critical for battery-powered systems during charge termination. |
| External frequency synchronization | Synchronizes to external clock via SYNC pin - eliminates beat frequencies in multi-converter systems (e.g., dual-display setups). |
Applications
| Automotive Navigation Displays | Industrial TFT LCD Backlighting |
|---|---|
|
Use Scenario: Driving four parallel LED strings in a 10.1-inch automotive infotainment display with wide ambient temperature range (–40°C to +105°C cabin). IC Role / Device Role / Timing Role: Primary boost LED driver with integrated fault monitoring and thermal derating to prevent LED degradation under prolonged high-temperature operation. Use Value: ±1.5% current matching ensures uniform screen luminance; OPENLED/SHORTLED flags enable fail-safe display shutdown per ISO 26262 ASIL-B requirements. |
Use Scenario: Powering high-brightness backlight for a 15-inch industrial HMI panel operating continuously in factory environments (40°C ambient, 24V DC supply). IC Role / Device Role / Timing Role: Constant-current LED controller with programmable UVLO and soft-start to withstand brownouts and inrush current surges. Use Value: 3000:1 True Color PWM dimming enables precise brightness control without color shift; 44V output headroom supports aging LED forward-voltage drift. |
| Desktop Monitor Backlight | Notebook Display Power |
|
Use Scenario: Four-string LED driver in a 24-inch desktop monitor with adaptive brightness control via ambient light sensor and host MCU. IC Role / Device Role / Timing Role: High-efficiency (90%) boost converter with analog dimming interface (CTRL) and PWM dimming capability for hybrid brightness control. Use Value: Adjustable switching frequency (200kHz–2.1MHz) avoids audible noise in sensitive office environments; TSET-based thermal management extends LED lifetime. |
Use Scenario: Compact LED driver in ultrabook display subsystem where PCB space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Integrated solution replacing discrete boost + current sink, minimizing BOM count and layout complexity. Use Value: 28-pin TSSOP package with exposed pad delivers 2.5W dissipation capability; SHDN/UVLO pin enables seamless integration with system power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756EFE#TRPBF | Higher 5A switch current, supports SEPIC/buck-boost topologies, but lacks integrated OPENLED/SHORTLED flags and TSET-based thermal derating. | Better suited for high-power single-string or mixed-topology designs; not optimized for four-string matching or automotive fault reporting. | Select when driving >200mA/string or requiring topology flexibility; avoid when ±1.5% matching or ASIL-compliant diagnostics are required. |
| TPS61165DRVR | Lower 1.2A switch current, fixed 1.2MHz frequency, no programmable UVLO or thermal derating; only two LED strings supported. | Targeted at cost-sensitive consumer displays; lacks fault flags, analog dimming, and wide input range. | Consider for low-cost notebook backlight where four-string operation and automotive qualification are unnecessary. |
Compared with LT3599EFE#TRPBF, LT3756EFE#TRPBF offers higher power headroom but sacrifices integrated diagnostics and thermal management, while TPS61165DRVR reduces feature set and channel count to meet budget constraints - making LT3599EFE#TRPBF the optimal balance of precision, protection, and application-specific integration for multi-string automotive and industrial displays.
Availability
LT3599EFE#TRPBF is available at Aetrix Electronics and suitable for automotive navigation displays, industrial HMI panels, and commercial desktop monitors requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3599EFE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3599 belongs to Linear's high-accuracy LED driver product line, engineered specifically for demanding backlight applications requiring tight current matching, robust fault handling, and thermal-aware operation in harsh environments.
FAQ
What is the maximum LED string voltage supported by the LT3599EFE#TRPBF?
The LT3599EFE#TRPBF supports up to 44V output voltage, sufficient to drive four series-connected white LEDs (typically ~10V each at 120mA) with margin for forward-voltage variation, diode drop, and ripple. This rating is confirmed in Absolute Maximum Ratings and Typical Application circuits, and applies across the full –40°C to +125°C operating junction temperature range.
Does the LT3599EFE#TRPBF support dimming when input voltage exceeds output voltage?
Yes, the LT3599EFE#TRPBF maintains accurate LED current regulation even when VIN > VOUT - a key feature documented in the Description and Applications Information sections. This enables reliable operation during battery charge termination or transient overvoltage conditions without current collapse or instability.
How is LED current matching of ±1.5% achieved in the LT3599EFE#TRPBF?
The LT3599EFE#TRPBF achieves ±1.5% LED current matching through matched internal current sources referenced to a common bandgap (VREF = 1.227V) and shared error amplifier architecture. This specification is guaranteed over temperature (–40°C to +125°C) and validated in Electrical Characteristics tables and Typical Performance plots (Figure TA01b).
Can the LT3599EFE#TRPBF drive fewer than four LED strings?
Yes - the LT3599EFE#TRPBF supports three-string operation via the DISABLE4 pin (tie to VREF and connect LED4 to LED3), or two-string operation by paralleling LED1+LED2 and LED3+LED4. The device automatically adjusts regulation to the lowest active LED pin voltage, as detailed in the Operation section and Pin Functions table.
What is the purpose of the VO_SW pin on the LT3599EFE#TRPBF?
The VO_SW pin on the LT3599EFE#TRPBF connects to an internal PMOS switch between VOUT and the FB resistor divider. It disconnects the divider during PWM off-time and shutdown, preventing output capacitor discharge and enabling higher PWM dimming ratios (up to 3000:1) without false OPENLED flag assertion - a function explicitly described in the Block Diagram and Overvoltage Protection section.
LT3599EFE#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
LT3599EFE#TRPBF FAQ
1.How can I place an order for LT3599EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3599EFE#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 LT3599EFE#TRPBF reliable?
The price and inventory of LT3599EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3599EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3599EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3599EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3599EFE#TRPBF?
LT3599EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3599EFE#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 LT3599EFE#TRPBF?
For technical support, including LT3599EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3599EFE#TRPBF requirements.
6.How does Aetrix verify that LT3599EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3599EFE#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 LT3599EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3599EFE#TRPBF?
All LT3599EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3599EFE#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 LT3599EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3599EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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