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Analog Devices Inc. LT3762EFE#PBF
- Part No.:
- LT3762EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3762EFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
LT3762EFE#PBF from Analog Devices is a 28-lead TSSOP synchronous DC/DC LED controller supporting constant-current (±3.5%) and constant-voltage (±2%) regulation, rail-to-rail current sensing (0V–60V), 100kHz–1MHz programmable switching frequency, and 3000:1 external PWM dimming. It drives high-current LEDs in boost, SEPIC, buck, or buck-boost topologies for industrial and automotive lighting.
For engineers reviewing the LT3762EFE#PBF datasheet, LT3762EFE#PBF pinout, LT3762EFE#PBF application, or LT3762EFE#PBF equivalent, key selection factors include its 60V synchronous boost capability, integrated 7.5V gate driver supply, spread-spectrum EMI reduction, open/short LED fault flags, and dual analog/digital dimming control with ±2% CV accuracy.
Technical Context
The LT3762EFE#PBF implements current-mode control with rail-to-rail ISP–ISN sensing (0V–60V common-mode range) and a transconductance error amplifier (VC pin) for loop stabilization. Its internal oscillator supports frequency programming via RT resistor (90–1240 kHz) and spread-spectrum modulation via SSFM pin to reduce EMI peaks.
It integrates dual gate drivers: BG (low-side N-MOSFET, 230ns min on-time) and TG (high-side synchronous N-MOSFET, 130ns min on-time), plus PWMTG (inverted P-MOSFET driver with 7V VGS clamp). The device features dedicated OPENLED and SHORTLED open-collector fault flags with latched reporting during PWM low states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 38.5V - supports wide-input industrial and automotive battery systems including cold-crank scenarios. |
| Max Output Voltage | 60V - enables driving long LED strings (e.g., 15–20 white LEDs) in boost configuration without external level-shifting. |
| Current Sense Accuracy | ±3.5% CC regulation - ensures precise LED current control critical for color consistency and thermal management in high-power lighting. |
| Switching Frequency | 100kHz to 1MHz - allows optimization of inductor size, efficiency, and EMI filtering across diverse power levels (e.g., 60W typical). |
| Dimming Ratio | 3000:1 external PWM - delivers deep, flicker-free dimming essential for architectural and automotive ambient lighting. |
| INTVCC Regulator | 7.5V ±0.2V - powers internal logic and gate drivers independently, eliminating need for external bias supply in most designs. |
| Fault Protection | Open LED (C/10 threshold), short LED (FB < 300mV), overcurrent (ISP–ISN > 600mV), thermal shutdown - provides autonomous system-level safety without host MCU intervention. |
Pinout & Package
LT3762EFE#PBF is housed in a 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29), which must be soldered to PCB ground for thermal and electrical performance. θJA = 30°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 15, 29) | Ground reference and thermal path | Multiple GND pins and exposed pad ensure low-impedance return and efficient heat dissipation in high-current LED driver layouts. |
| ISP / ISN | High-side LED current sense inputs | Rail-to-rail sensing (0V–60V) enables accurate current measurement regardless of LED string cathode/anode configuration or topology (boost/SEPIC). |
| TG / BG / SW | Synchronous MOSFET gate drivers and switch node | TG drives high-side N-MOSFET; BG drives low-side N-MOSFET; SW is shared return path-enables efficient synchronous rectification in boost mode. |
| PWMTG | Inverted P-MOSFET gate driver output | Drives series PMOS between VISP and (VISP – 7V); 7V clamp protects gate oxide-supports LED output disconnect and overcurrent protection. |
| OPENLED / SHORTLED | Open-collector fault flag outputs | Assert low on open-circuit (FB > VFB – 50mV + C/10 condition) or short-circuit (FB < 300mV)-enable direct connection to microcontroller GPIO or status LEDs. |
| CTRL1 / CTRL2 | Current sense threshold scaling inputs | Program full-scale LED current sense threshold (250mV max) from 10% to 100% via voltage divider-supports temperature compensation and dimming curves. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation (SSFM) | Reduces peak EMI by ±15% frequency dithering-eliminates need for large ferrite beads or shielding in Class B EMC-compliant lighting designs. |
| Integrated 7.5V INTVCC regulator | Supplies gate drivers and internal logic from VIN-removes requirement for external LDO or charge pump, simplifying BOM and layout. |
| 3000:1 external PWM dimming | Supports ultra-deep dimming down to 0.033% duty cycle-meets stringent requirements for automotive interior and tunable-white lighting. |
| Programmable UVLO with hysteresis | EN/UVLO threshold (1.22V nominal) set via resistor divider-enables robust start-up sequencing and brown-out protection in 12V/24V vehicle systems. |
| Soft-start with fault timer (SS pin) | Capacitor-programmed ramp with automatic discharge on fault (overcurrent, short, UVLO)-prevents inrush current damage and enables auto-retry behavior. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 40–60W white LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current controller managing synchronous boost stage; regulates LED current while monitoring open/short faults in real time. Use Value: ±3.5% current accuracy maintains consistent lumen output across temperature; 3000:1 PWM dimming enables smooth glare-free transitions during cornering or city/highway mode switching. | Use Scenario: Powering multi-string 100–200W LED fixtures in warehouse or factory environments with 24VDC or 36VDC distributed power rails. IC Role / Device Role / Timing Role: Synchronous boost LED controller operating at 300kHz to balance efficiency (>96%) and EMI compliance; uses SSFM to pass CISPR-15 radiated emissions limits. Use Value: Rail-to-rail ISP–ISN sensing (0V–60V) accommodates varying LED string voltages during dimming; OPENLED/SHORTLED flags feed into building management system for predictive maintenance alerts. |
| Outdoor Streetlight Controller | Medical Surgical Lighting |
Use Scenario: Outdoor LED streetlight with 0–10V analog dimming interface and DALI communication, requiring robust fault handling in harsh environmental conditions. IC Role / Device Role / Timing Role: Dual-mode controller supporting both constant-current (LED drive) and constant-voltage (auxiliary circuitry) operation; uses FB pin for CV regulation of sensor or radio modules. Use Value: ±2% CV regulation ensures stable power to wireless transceivers; programmable VIN UVLO prevents erratic behavior during grid voltage sags; -40°C to 125°C junction rating supports uncooled outdoor enclosures. | Use Scenario: High-CRI surgical headlight requiring flicker-free, stepless dimming from 100% to 1% with zero perceptible delay or color shift. IC Role / Device Role / Timing Role: Precision LED current controller using internal PWM generator (250:1 dimming) combined with external PWM override for master-slave synchronization across multiple light heads. Use Value: Internal PWM frequency (570–1050Hz) avoids audible noise; VC pin loop compensation enables fast transient response (<10µs) to surgeon's dimming commands; 7.5V INTVCC powers isolated gate drivers without cross-talk. |
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 DC/DC conversion, not optimized for LED current regulation or dimming interfaces. | Select only if topology requires buck-boost (VIN > VOUT or VIN < VOUT) and LED-specific fault flags are handled externally. |
| LM3423MH/NOPB | Asynchronous boost LED controller; no synchronous TG driver; max 40V output; no SSFM or internal PWM generator. | Lower cost solution for non-critical, lower-power (<25W) LED applications where EMI and deep dimming are not primary concerns. | Choose when budget constraints outweigh need for 60V capability, spread-spectrum, or 3000:1 dimming-requires external PMOS for output disconnect. |
Compared with LTC3789EFE#PBF and LM3423MH/NOPB, the LT3762EFE#PBF delivers superior LED-specific integration-including rail-to-rail current sensing, dual fault flags, 3000:1 dimming, and 60V synchronous boost-making it optimal for high-reliability, high-performance lighting where system-level protection and precision dimming are mandatory.
Availability
LT3762EFE#PBF is available at Aetrix Electronics and suitable for industrial lighting, automotive exterior lighting, and medical illumination systems requiring stable component supply, extended temperature operation (-40°C to 125°C), and long-term production continuity.
Supply support for LT3762EFE#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 ICs.
The LT3762 product line was designed specifically for high-efficiency, high-reliability LED driver applications demanding precise current regulation, comprehensive fault protection, and flexible dimming-targeting automotive, industrial, and architectural lighting markets.
FAQ
What is the maximum output voltage supported by the LT3762EFE#PBF?
The LT3762EFE#PBF supports a synchronous boost output voltage up to 60V, enabling direct drive of long LED strings without cascaded converters. This rating is validated under continuous operation at TJ ≤ 125°C; absolute maximum pin voltage is 60V for ≤1 second nonrepetitive transients per datasheet Absolute Maximum Ratings.
Does the LT3762EFE#PBF support both constant-current and constant-voltage regulation?
Yes, the LT3762EFE#PBF supports both modes: constant-current regulation with ±3.5% accuracy via ISP–ISN sensing, and constant-voltage regulation with ±2% accuracy referenced to the FB pin's 1.25V internal threshold. The FB pin serves dual roles-voltage feedback for CV operation and open-LED detection during CC mode.
How does the LT3762EFE#PBF implement spread-spectrum frequency modulation?
The LT3762EFE#PBF implements spread-spectrum modulation via the SSFM pin: applying a capacitor from SSFM to GND generates a triangle ramp that modulates switching frequency between FSW and FSW – 30%. The ramp frequency is set by 12μA/(2 × 1V × CSSFM), reducing peak EMI without altering average frequency or efficiency.
What is the purpose of the PWMTG pin on the LT3762EFE#PBF?
The PWMTG pin on the LT3762EFE#PBF is an inverted P-MOSFET gate driver output that drives a series PMOS between VISP and (VISP – 7V), providing LED output disconnect and short-circuit protection. Its internal 7V clamp limits VGS, protecting the PMOS gate oxide-critical for reliable operation in automotive and industrial environments.
Can the LT3762EFE#PBF operate in SEPIC topology?
Yes, the LT3762EFE#PBF supports SEPIC topology through nonsynchronous operation: configure SNSP to the source of the low-side FET and SNSN to the ground side of the current sense resistor. Its rail-to-rail current sense input (0V–60V) and dedicated control architecture enable stable current regulation in SEPIC, buck, boost, and buck-boost configurations.
LT3762EFE#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
LT3762EFE#PBF FAQ
1.How can I place an order for LT3762EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762EFE#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 LT3762EFE#PBF reliable?
The price and inventory of LT3762EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3762EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762EFE#PBF?
LT3762EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762EFE#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 LT3762EFE#PBF?
For technical support, including LT3762EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762EFE#PBF requirements.
6.How does Aetrix verify that LT3762EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3762EFE#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 LT3762EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3762EFE#PBF?
All LT3762EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762EFE#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 LT3762EFE#PBF part is unused and in its original packaging.
Return procedure for LT3762EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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