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Analog Devices Inc. LT3762IFE#PBF
- Part No.:
- LT3762IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3762IFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,021
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Product details
Overview
LT3762IFE#PBF from Analog Devices is a synchronous DC/DC LED controller supporting constant-current (±3.5%) and constant-voltage (±2%) regulation, with rail-to-rail current sensing (0V–60V), 100kHz–1MHz programmable switching frequency, and integrated 7.5V gate driver supply. It drives high-current LEDs in boost, SEPIC, buck, or buck-boost topologies for industrial and automotive lighting.
For engineers reviewing the LT3762IFE#PBF datasheet, LT3762IFE#PBF pinout, LT3762IFE#PBF application, or LT3762IFE#PBF equivalent, key selection considerations include its 3000:1 external PWM dimming range, open/short LED protection flags (OPENLED/SHORTLED), programmable VIN undervoltage lockout (2.5V–38.5V), spread-spectrum modulation (SSFM), and dual-mode current/voltage regulation capability.
Technical Context
The LT3762IFE#PBF implements current-mode control with a transconductance error amplifier (VC pin) and rail-to-rail ISP–ISN differential sense input (0V–60V common-mode range). Its oscillator uses an external RT resistor to set frequency from 90kHz to 1240kHz, while SSFM pin enables ±30% frequency dithering to reduce EMI peaks.
It integrates two independent gate drivers: BG (low-side N-MOSFET) and TG (synchronous high-side N-MOSFET), plus PWMTG (inverted P-MOSFET driver with 7V VGS clamp). The internal INTVCC regulator delivers 7.5V (±2.7%) at up to 140mA, eliminating need for external bias supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 38.5V - supports wide-input battery and industrial power rails without pre-regulation |
| Output Voltage | Up to 60V - enables high-string LED arrays or HV DC/DC conversion in boost/SEPIC |
| Switching Frequency | 100kHz–1MHz (RT-programmable) - balances efficiency, magnetics size, and EMI compliance |
| Current Regulation Accuracy | ±3.5% - ensures stable LED brightness across temperature and line/load variations |
| PWM Dimming Ratio | 3000:1 (external), 250:1 (internal) - meets high-dynamic-range display and automotive adaptive lighting needs |
| Protection Features | Open LED (OPENLED flag), shorted LED (SHORTLED flag), thermal shutdown, overcurrent (600mV ISP–ISN threshold) |
| Package | 28-lead TSSOP with exposed pad - provides thermal performance (θJA = 30°C/W) for high-power LED driver PCBs |
Pinout & Package
LT3762IFE#PBF is housed in a 28-lead plastic TSSOP (FE package) with exposed pad soldered to PCB ground for thermal management. Pin 29 is the exposed pad and must be connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 15, 29) | Ground reference | Multiple low-impedance return paths; exposed pad (Pin 29) is mandatory GND connection for thermal and noise integrity |
| ISP / ISN | LED current sense inputs | Differential pair measuring LED current via external sense resistor; 0V–60V common-mode range supports high-side or low-side sensing |
| FB | Voltage feedback input | Regulates output voltage to 1.25V (±2%); triggers OPENLED/SHORTLED flags based on threshold comparisons |
| BG / TG / SW | Synchronous MOSFET drivers | BG drives low-side N-FET; TG drives high-side N-FET; SW is switch node return path tied to BOOST capacitor negative terminal |
| PWMTG | P-channel MOSFET gate driver | Inverts PWM signal to drive series PMOS between ISP and (ISP – 7V); 7V clamp protects gate oxide |
| EN/UVLO | Enable & input undervoltage detection | 1.22V falling threshold with programmable hysteresis; disables IC and reduces IQ to 0.1µA when pulled ≤0.4V |
| RT | Frequency programming | Resistor-to-GND sets switching frequency; 82.5kΩ yields ~200kHz, enabling optimization of efficiency vs. component size |
| SSFM | Spread-spectrum modulation | Enables triangle-wave dithering of fSW to reduce peak EMI by spreading energy across bandwidth |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail current sense (0V–60V) | Enables flexible placement of sense resistor-high-side, low-side, or floating-without level-shifting circuitry |
| Integrated 7.5V INTVCC regulator | Supplies gate drivers and internal logic directly from VIN; eliminates need for external LDO or charge pump |
| Programmable open/short LED protection | OPENLED asserts when FB > (VFB – 50mV) AND ISP–ISN < 25mV; SHORTLED asserts when FB < 300mV OR ISP–ISN > 600mV |
| Internal PWM dimming generator | Capacitor on PWM pin + analog DIM voltage (0.4V–3.1V) generates 570Hz–1050Hz dimming signal with 0.22%–58% duty cycle |
| Soft-start with fault timer (SS pin) | 28µA pull-up charges external capacitor; faults (overcurrent, UVLO, short) disable switching and discharge SS via 2.8µA sink |
Applications
| Automotive Headlamp Drivers | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 30V–60V LED strings in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current controller with 3000:1 external PWM dimming and thermal foldback via CTRL pins. Use Value: Maintains precise LED current (±3.5%) across -40°C to 125°C junction range while enabling flicker-free high-speed dimming for matrix beam control. | Use Scenario: Powering multi-string 48V LED fixtures in warehouse and factory environments with long cable runs. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output to 60V with open-circuit LED protection and brownout recovery. Use Value: Rail-to-rail ISP–ISN sensing (0V–60V) allows direct high-side current measurement without isolation, reducing BOM cost and layout complexity. |
| Outdoor Signage Power Supplies | Medical Surgical Lighting |
Use Scenario: Driving RGB LED modules in outdoor digital billboards requiring EMI-compliant operation near sensitive receivers. IC Role / Device Role / Timing Role: Spread-spectrum modulator (SSFM) combined with programmable 100kHz–1MHz fSW to meet CISPR-11 Class B limits. Use Value: Triangle-wave dithering reduces peak conducted emissions by >10dB compared to fixed-frequency operation, easing EMC certification. | Use Scenario: Precision white-light LED drivers in surgical headlamps demanding stable color temperature and zero visible flicker. IC Role / Device Role / Timing Role: Dual-loop controller maintaining constant current (±3.5%) and constant voltage (±2%) simultaneously during dimming transitions. Use Value: Seamless transition between CC/CV modes prevents LED current overshoot during rapid dimming, preserving lumen stability and device lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#PBF | 4-switch synchronous buck-boost controller; no integrated LED-specific protections (OPENLED/SHORTLED); requires external current sense amp | Designed for wide-VIN battery-powered systems needing bidirectional voltage regulation-not optimized for LED current accuracy or dimming interfaces | Select only if topology requires buck-boost and LED-specific features are implemented externally |
| LM3410XMF/NOPB | Single-stage boost LED driver IC; fixed 1.6MHz fSW; no SSFM, no internal PWM generator, no programmable UVLO, max 40V output | Targeted at low-power portable LED apps (<1A); lacks rail-to-rail sensing, open/short flags, and thermal robustness for industrial use | Consider only for cost-sensitive, low-power designs where 3000:1 dimming and 60V capability are unnecessary |
Compared with LTC3789EFE#PBF and LM3410XMF/NOPB, the LT3762IFE#PBF uniquely combines rail-to-rail LED current sensing, integrated open/short LED fault reporting, programmable spread-spectrum EMI reduction, and 3000:1 external PWM dimming-making it the only option qualified for high-reliability, high-dynamic-range LED lighting in automotive and industrial settings.
Availability
LT3762IFE#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, outdoor signage power supplies, and medical surgical lighting requiring stable component supply across extended temperature ranges (-40°C to 125°C).
Supply support for LT3762IFE#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 (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#PBF belongs to the Linear Technology LED controller product line, engineered specifically for high-efficiency, high-reliability constant-current LED driving in harsh environments-including automotive, industrial, and outdoor applications.
FAQ
What is the operating temperature range of the LT3762IFE#PBF?
The LT3762IFE#PBF is rated for a junction temperature range of –40°C to 125°C. This I-grade qualification ensures reliable operation in automotive under-hood and industrial control cabinet environments. Thermal shutdown activates above 165°C, and the exposed pad must be soldered to a thermal plane to maintain θJA = 30°C/W. The LT3762IFE#PBF shares this rating with the LT3762EFE#PBF but differs from the H-grade (–40°C to 150°C) variant.
Does the LT3762IFE#PBF support both constant-current and constant-voltage regulation?
Yes, the LT3762IFE#PBF supports dual-mode regulation. It regulates LED current via ISP–ISN differential sensing (±3.5% accuracy) and output voltage via the FB pin (±2% accuracy at 1.25V). When FB rises above VFB – 50mV while ISP–ISN falls below 25mV, the OPENLED flag asserts-enabling automatic transition to CV mode for LED string protection or charger applications. This behavior is intrinsic to the LT3762IFE#PBF's architecture.
How does the SSFM pin reduce EMI in the LT3762IFE#PBF?
The SSFM pin in the LT3762IFE#PBF enables spread-spectrum frequency modulation by generating a triangle ramp that dithers the switching frequency between fSW and fSW – 30%. With CSSFM = 1nF, the ramp frequency is ~6kHz, spreading energy across a 30% bandwidth and reducing peak radiated/conducted emissions by up to 10dB. This feature is confirmed in the LT3762IFE#PBF's Electrical Characteristics table and Typical Performance curves (Fig G28–G31).
Can the LT3762IFE#PBF drive LEDs in SEPIC topology?
Yes, the LT3762IFE#PBF explicitly supports SEPIC configuration per its datasheet Applications section and Pin Functions description. For SEPIC, SNSP connects to the source of the low-side FET and SNSN to the ground side of the sense resistor-leveraging rail-to-rail current sensing (0V–60V) without external amplifiers. This capability is validated in the LT3762IFE#PBF's absolute maximum ratings and typical application circuits.
What is the purpose of the PWMTG pin on the LT3762IFE#PBF?
The PWMTG pin on the LT3762IFE#PBF is an inverted PWM output designed to drive the gate of an external P-channel MOSFET placed in series with the LED string. It swings between VISP and (VISP – 7V), with an internal 7V clamp protecting the PMOS gate oxide. This enables true LED string disconnect during PWM off-time-critical for achieving deep dimming ratios (up to 3000:1) and preventing leakage current in the LT3762IFE#PBF-based designs.
LT3762IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3762IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762IFE#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 LT3762IFE#PBF reliable?
The price and inventory of LT3762IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3762IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762IFE#PBF?
LT3762IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762IFE#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 LT3762IFE#PBF?
For technical support, including LT3762IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762IFE#PBF requirements.
6.How does Aetrix verify that LT3762IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3762IFE#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 LT3762IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3762IFE#PBF?
All LT3762IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762IFE#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 LT3762IFE#PBF part is unused and in its original packaging.
Return procedure for LT3762IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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