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Analog Devices Inc. LT3762IFE#TRPBF
- Part No.:
- LT3762IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3762IFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,648
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Product details
Overview
LT3762IFE#TRPBF from Analog Devices is a synchronous DC/DC LED controller supporting constant-current (±3.5%) and constant-voltage (±2%) regulation, with 2.5V–38.5V input range, 60V max boost output, and 100kHz–1MHz programmable switching frequency. It drives high-current LEDs in boost, SEPIC, buck, or buck-boost topologies with rail-to-rail current sensing (0V–60V) and integrated 7.5V gate driver supply.
For engineers reviewing the LT3762IFE#TRPBF datasheet, LT3762IFE#TRPBF pinout, LT3762IFE#TRPBF application, or LT3762IFE#TRPBF equivalent, key selection considerations include its 3000:1 external PWM dimming capability, spread-spectrum EMI reduction via SSFM pin, open/short LED fault flags (OPENLED/SHORTLED), and dual-mode analog/PWM dimming control through DIM and PWM pins.
Technical Context
The LT3762IFE#TRPBF implements current-mode control with rail-to-rail ISP–ISN differential sensing (0V–60V common-mode), enabling accurate LED current regulation across boost, SEPIC, buck, and buck-boost configurations. Its internal transconductance error amplifier (gm = 500 µS) regulates FB to 1.25 V and supports fast transient response via VC pin compensation.
It integrates dual gate drivers: BG (low-side NMOS, 230 ns min on-time) and TG (high-side NMOS, 130 ns min on-time), plus PWMTG for external PMOS disconnect. The oscillator uses RT resistor programming and supports spread-spectrum modulation via SSFM pin (–30% frequency deviation) to reduce EMI peaks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 38.5V - supports wide-input industrial and automotive power rails without pre-regulation |
| Max Output Voltage | 60V - enables driving long LED strings (e.g., 15–20 white LEDs in series) |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor to optimize efficiency, size, and EMI |
| Current Regulation Accuracy | ±3.5% - ensures consistent LED brightness across temperature and line variations |
| Constant-Voltage Regulation | ±2% at FB = 1.25V - provides stable voltage for charger or CV+CC hybrid applications |
| Rail-to-Rail Sense Range | 0V to 60V on ISP/ISN - allows high-side, low-side, or floating sense resistor placement |
| PWM Dimming Ratio | 3000:1 external, 250:1 internal - enables precise brightness control in display and architectural lighting |
Pinout & Package
LT3762IFE#TRPBF is housed in a 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29), rated for –40°C to +125°C junction temperature. Thermal resistance θJA = 30°C/W; exposed pad must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal loads and INTVCC regulator; requires local 1µF low-ESR bypass |
| EN/UVLO | Enable and undervoltage lockout | 1.22V falling threshold with programmable hysteresis; <0.4V disables device and reduces IQ to <1µA |
| ISP / ISN | LED current sense inputs | Differential pair for constant-current regulation; 600mV overcurrent threshold triggers SHORTLED and shutdown |
| FB | Voltage feedback input | Regulates to 1.25V; detects open LED (FB > VFB–50mV + ISP–ISN <25mV) and short LED (FB <300mV) |
| PWM / DIM | Dimming control interface | PWM pin accepts digital signal for 3000:1 dimming; DIM sets internal PWM duty (0.4%–97%) via capacitor-coupled oscillator |
| TG / BG / PWMTG | Gate drivers | TG/BG drive synchronous N-MOSFETs; PWMTG drives external P-MOSFET for LED disconnect and overcurrent protection |
| SSFM | Spread-spectrum modulation | Enables triangle-wave frequency dithering (–30% deviation) to reduce conducted/radiated EMI peaks |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost topology support | Enables >90% efficiency at 60W (e.g., 30V input → 60V/1A LED string) with reduced conduction loss vs. diode-based designs |
| Integrated 7.5V INTVCC regulator | Eliminates need for external bias supply; powers gate drivers and control circuitry from VIN with 7.3–7.7V regulation |
| Programmable open/short LED protection | OPENLED and SHORTLED open-collector flags provide real-time fault reporting with latched status during PWM low periods |
| Rail-to-rail current sense input range | Supports Kelvin-connected sense resistors anywhere in the LED path - high-side, low-side, or floating - without level-shifting |
| Internal PWM dimming generator | Configurable via DIM voltage and PWM capacitor; delivers 250:1 dimming ratio without external microcontroller or timing IC |
| Soft-start and fault timer via SS pin | 28µA pull-up and 2.8µA pull-down enable programmable start-up ramp and automatic fault hold-off until SS discharges below 0.2V |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 48V LED arrays in commercial vehicles with cold-crank (4.5V) and load-dump (40V) immunity. IC Role / Device Role / Timing Role: Constant-current LED controller with VIN UVLO hysteresis, 60V output headroom, and thermal shutdown. Use Value: Maintains ±3.5% LED current accuracy across –40°C to +125°C ambient, eliminating brightness drift in under-hood environments. |
Use Scenario: Powering 100W+ high-lumen LED fixtures in warehouse ceilings using 24V DC distribution. IC Role / Device Role / Timing Role: Synchronous boost controller with rail-to-rail ISP–ISN sensing and spread-spectrum EMI reduction. Use Value: Achieves >96% peak efficiency at full load while meeting CISPR-11 Class B conducted EMI limits without added filtering. |
| Outdoor Signage Power Supply | Medical Surgical Light Driver |
Use Scenario: Outdoor LED signage requiring 3000:1 PWM dimming for daylight-to-night ambient adaptation. IC Role / Device Role / Timing Role: Dual-mode dimming controller with external PWM input and internal oscillator driven by DIM voltage. Use Value: Delivers flicker-free dimming down to 0.033% duty cycle without microcontroller intervention or external clock sources. |
Use Scenario: Precision surgical lighting demanding stable color temperature and zero-output ripple during critical procedures. IC Role / Device Role / Timing Role: Constant-current regulator with open/short LED detection and soft-start-controlled ramp-up. Use Value: Prevents LED flash-on-power-up and immediately asserts OPENLED flag if any LED string opens, ensuring fail-safe operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#TRPBF | Non-synchronous boost controller; no TG driver; max 40V output; no SSFM or OPENLED/SHORTLED flags | Lacks rail-to-rail ISP–ISN sensing and integrated fault reporting; suitable only for simpler CV-only or lower-voltage LED systems | Choose when 60V output, synchronous operation, or LED fault diagnostics are not required - reduces BOM count but sacrifices protection features |
| MAX20050ATPA/VY+ | Automotive-grade 60V LED controller; includes CAN interface; fixed 2.2MHz switching; no internal PWM generator | Designed for ASIL-B compliance; adds communication layer but removes analog dimming flexibility and spread-spectrum capability | Prefer for vehicle integration where diagnostics must be reported over CAN bus; avoid if standalone analog dimming or EMI-sensitive layouts dominate design priorities |
Compared with LTC3789EFE#TRPBF and MAX20050ATPA/VY+, the LT3762IFE#TRPBF uniquely combines 60V synchronous boost, rail-to-rail current sensing, integrated fault flags, and programmable spread-spectrum - making it optimal for high-reliability, high-efficiency LED systems where layout space, thermal management, and EMI are constrained.
Availability
LT3762IFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, outdoor signage, medical surgical lights, and precision current-limited voltage regulators requiring stable component supply and long-term production continuity.
Supply support for LT3762IFE#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 (now part of Analog Devices, Inc. following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3762IFE#TRPBF belongs to Linear's LED controller product line, designed specifically for high-efficiency, high-reliability constant-current LED drivers in automotive, industrial, and medical lighting where precision regulation, robust fault handling, and EMI control are critical.
FAQ
What is the operating temperature range for the LT3762IFE#TRPBF?
The LT3762IFE#TRPBF is specified for a junction temperature range of –40°C to +125°C. This I-grade rating makes it suitable for under-hood automotive applications and industrial environments where ambient temperatures exceed 85°C. The exposed pad (Pin 29) must be soldered to a thermal pad on the PCB to maintain θJA ≤ 30°C/W.
Does the LT3762IFE#TRPBF support both boost and SEPIC topologies?
Yes, the LT3762IFE#TRPBF supports boost, SEPIC, buck, and buck-boost configurations. Its rail-to-rail ISP–ISN current sense input (0V–60V common-mode) and flexible SNSP/SNSN connections allow direct implementation of nonsynchronous SEPIC with high-side or low-side sensing - confirmed in the Applications Information section of the official datasheet.
How does the SSFM pin reduce EMI in the LT3762IFE#TRPBF?
The SSFM pin on the LT3762IFE#TRPBF enables spread-spectrum frequency modulation by generating a triangle ramp that modulates the switching frequency between fSW and fSW–30%. This dithers energy across a bandwidth rather than concentrating it at harmonics, reducing peak conducted and radiated EMI - verified in typical performance curves (Figure G28–G31) and referenced in the Features list.
Can the LT3762IFE#TRPBF operate without an external microcontroller for dimming?
Yes, the LT3762IFE#TRPBF includes an internal PWM dimming generator. By connecting a capacitor between the PWM pin and GND and applying a DC voltage to the DIM pin (0.4V–3.1V), it produces a self-timed dimming signal with 250:1 ratio - eliminating need for external timing ICs or MCU firmware for basic dimming control.
What protection features are built into the LT3762IFE#TRPBF?
The LT3762IFE#TRPBF integrates open LED (OPENLED flag), short LED (SHORTLED flag), overcurrent (ISP–ISN >600mV), thermal shutdown (>165°C), INTVCC undervoltage lockout (5.1V), and soft-start fault hold-off. All protections assert corresponding flags and disable switching until fault clearance - detailed in the Electrical Characteristics table and Pin Functions section.
LT3762IFE#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 Controller
- Topology:
- SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 38.5V
- Voltage - Output:
- 60V
- Current - Output / Channel:
- -
- Frequency:
- 90kHz ~ 1.24MHz
- Dimming:
- Analog, PWM
- Applications:
- Industrial Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3762IFE#TRPBF FAQ
1.How can I place an order for LT3762IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762IFE#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 LT3762IFE#TRPBF reliable?
The price and inventory of LT3762IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3762IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762IFE#TRPBF?
LT3762IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762IFE#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 LT3762IFE#TRPBF?
For technical support, including LT3762IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762IFE#TRPBF requirements.
6.How does Aetrix verify that LT3762IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3762IFE#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 LT3762IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3762IFE#TRPBF?
All LT3762IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762IFE#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 LT3762IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3762IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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