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Analog Devices Inc. LT3762HFE#TRPBF
- Part No.:
- LT3762HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3762HFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,635
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Product details
Overview
LT3762HFE#TRPBF from Analog Devices is a high-temperature-rated synchronous boost LED controller designed for constant-current and constant-voltage regulation in automotive and industrial lighting. It delivers 60V output, supports 2.5V–38.5V input, enables 3000:1 external PWM dimming, integrates spread-spectrum EMI reduction, and features rail-to-rail current sensing (0V–60V) for boost, SEPIC, buck, or buck-boost topologies.
For engineers reviewing the LT3762HFE#TRPBF datasheet, LT3762HFE#TRPBF pinout, LT3762HFE#TRPBF application, or LT3762HFE#TRPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, programmable 100kHz–1MHz switching frequency via RT pin, integrated 7.5V INTVCC supply, PMOS PWM disconnect capability, and dual protection flags (OPENLED/SHORTLED) with latched fault reporting.
Technical Context
The LT3762HFE#TRPBF implements current-mode control with a transconductance error amplifier (VC pin), programmable oscillator (RT pin), and rail-to-rail ISP/ISN current sense inputs supporting both high-side and low-side sensing configurations. Its internal PWM dimming generator (DIM/PWM pins) provides 250:1 dimming ratio with analog voltage control and capacitor-set frequency.
It integrates dual gate drivers: BG drives the low-side N-MOSFET with 230ns min on-time; TG drives the synchronous high-side N-MOSFET with 130ns min on-time; PWMTG drives an external P-MOSFET for LED disconnect and overcurrent protection. The device includes dedicated open-LED (FB-based) and short-LED (FB + ISP-ISN) detection with OPENLED/SHORTLED flag outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +150°C junction temperature - qualified for under-hood automotive and high-ambient industrial LED drivers. |
| Input Voltage Range | 2.5V to 38.5V - supports wide-input battery systems including 12V/24V automotive and 24V industrial rails. |
| Output Voltage Capability | Up to 60V - enables driving long LED strings (e.g., 15–20 white LEDs @ 3.2V each) in boost configuration. |
| Switching Frequency | 100kHz to 1MHz (programmable via RT resistor) - balances efficiency, EMI, and external component size. |
| Current Sense Range | Rail-to-rail 0V to 60V (ISP–ISN) - allows flexible placement of sense resistor in boost, SEPIC, buck, or buck-boost topologies. |
| PWM Dimming Ratio | 3000:1 external, 250:1 internal - meets stringent automotive headlight and architectural lighting dimming requirements. |
| INTVCC Regulator | 7.5V ±0.2V output - powers internal logic and gate drivers without external LDO, reducing BOM count. |
Pinout & Package
LT3762HFE#TRPBF is housed in a 28-lead plastic TSSOP package with exposed pad (FE package), thermally optimized for high-power LED driver applications. The exposed pad (Pin 29) must be soldered to PCB ground for thermal and electrical integrity.
| 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 heat dissipation for continuous 2A+ switch currents. |
| VIN (Pin 20) | Main power input | Supplies internal loads and INTVCC regulator; supports 2.5V–38.5V operation with undervoltage lockout at 1.22V threshold. |
| ISP / ISN (Pins 27, 28) | LED current sense inputs | Differential pair enabling rail-to-rail (0V–60V) current monitoring; triggers SHORTLED flag if VISP–ISN > 600mV. |
| FB (Pin 14) | Voltage feedback / protection input | Regulates to 1.25V; asserts OPENLED flag if FB > VFB–50mV while ISP–ISN < 25mV; asserts SHORTLED if FB < 300mV. |
| TG / BG (Pins 17, 18) | Synchronous N-MOSFET gate drivers | TG drives high-side FET (min 130ns on-time); BG drives low-side FET (min 230ns on-time); both support 7.5V INTVCC drive. |
| PWMTG (Pin 26) | P-MOSFET top-gate driver | Inverts PWM signal to drive series P-MOSFET between VISP and (VISP–7V); internal 7V clamp protects gate oxide. |
| RT (Pin 7) | Frequency programming input | Resistor-to-GND sets switching frequency from 100kHz to 1MHz; enables optimization for efficiency vs. EMI vs. inductor size. |
| SSFM (Pin 8) | Spread-spectrum modulation enable | When capacitor tied to GND, generates triangle ramp modulating fSW by ±30% to reduce peak EMI emissions. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 7.5V INTVCC regulator | Eliminates need for external bias supply; delivers up to 140mA, reducing system BOM and layout complexity. |
| Programmable 100kHz–1MHz switching | Enables optimal trade-off between conduction loss (low fSW), switching loss (high fSW), and magnetic component size. |
| Rail-to-rail ISP–ISN sensing (0V–60V) | Supports LED current sensing in any topology-boost (VIN-side), SEPIC (ground-side), or buck (output-side)-without level-shifting. |
| 3000:1 external PWM dimming | Meets automotive AEC-Q100 Class 0 lighting requirements; compatible with microcontroller GPIO or dedicated PWM generators. |
| Latched OPENLED/SHORTLED fault flags | Provides robust fault reporting during PWM dimming cycles; status updates only on PWM high, latches during PWM low. |
Applications
| Automotive Headlights | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Adaptive front-lighting systems (AFS) requiring precise, flicker-free dimming across wide ambient temperatures (–40°C to +125°C under hood). IC Role / Device Role / Timing Role: Constant-current LED controller managing 60V boost output for multi-string white LEDs; synchronizes PWM dimming with vehicle CAN bus commands. Use Value: Delivers 3000:1 dimming range and –40°C to +150°C operation, meeting AEC-Q100 Grade 0 reliability for safety-critical lighting. | Use Scenario: 150W LED fixtures in warehouses and factories where thermal management and long service life are critical. IC Role / Device Role / Timing Role: Synchronous boost controller regulating 3.5A LED current at 42V output; uses SSFM to meet CISPR-15 Class B conducted EMI limits. Use Value: Rail-to-rail current sensing enables direct ground-referenced shunt placement, simplifying thermal design and improving measurement accuracy at high ambient temps. |
| UV-C Disinfection Systems | Outdoor Street Lighting |
Use Scenario: High-intensity UV-C LED arrays (275nm) requiring stable current regulation despite rapid thermal cycling during pulsed operation. IC Role / Device Role / Timing Role: Constant-current source with fast transient response; uses VC compensation and soft-start (SS pin) to prevent inrush during repeated on/off cycles. Use Value: ±3.5% current regulation accuracy and C/10 open-LED detection ensure consistent germicidal dose delivery and system fault isolation. | Use Scenario: Smart streetlights with adaptive dimming, surge protection, and 0–10V/DALI interface compatibility operating outdoors from –30°C to +85°C ambient. IC Role / Device Role / Timing Role: Dual-mode controller supporting constant-current (LED drive) and constant-voltage (auxiliary sensor supply) operation via FB pin reconfiguration. Use Value: Integrated 7.5V INTVCC and programmable UVLO allow seamless integration with 12–48V DC microgrids and solar-charged battery banks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#TRPBF | 4-switch buck-boost controller; no integrated LED-specific protections (OPENLED/SHORTLED); requires external current sense amp. | Targets wide-input, wide-output voltage regulation-not optimized for constant-current LED drive or PWM dimming. | Select when bidirectional voltage conversion (VIN > VOUT or VIN < VOUT) is required, not for dedicated LED current regulation. |
| LM3423MH/NOPB | Lower temp grade (–40°C to +125°C); no spread-spectrum; 1000:1 PWM dimming; no internal INTVCC regulator. | Designed for mid-power LED drivers (<60W); lacks rail-to-rail ISP/ISN sensing and high-temp qualification. | Select for cost-sensitive, non-automotive applications where 150°C operation and EMI reduction are not required. |
Compared with LTC3789EMSE#TRPBF and LM3423MH/NOPB, the LT3762HFE#TRPBF uniquely combines automotive-grade temperature range, integrated LED protection logic, rail-to-rail sensing, and 3000:1 dimming-making it the only drop-in solution for high-reliability, high-dimming-ratio boost LED drivers.
Availability
LT3762HFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlight modules, industrial high-bay luminaires, UV-C disinfection systems, and outdoor smart street lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3762HFE#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 ICs.
The LT3762HFE#TRPBF belongs to the LT® LED controller product line, engineered specifically for high-efficiency, high-reliability constant-current LED drivers in demanding environments-including automotive, industrial, and medical lighting systems.
FAQ
What is the maximum junction temperature rating for the LT3762HFE#TRPBF?
The LT3762HFE#TRPBF is rated for continuous operation from –40°C to +150°C junction temperature, making it suitable for under-hood automotive applications and high-ambient industrial environments where standard commercial or industrial grade controllers would fail.
Does the LT3762HFE#TRPBF support SEPIC topology?
Yes, the LT3762HFE#TRPBF supports SEPIC topology via rail-to-rail ISP–ISN current sensing and flexible SNSP/SNSN configuration. When used in SEPIC mode, SNSN connects to ground-side of the sense resistor and SNSP to the switch node, enabling accurate current regulation without level shifters.
How does the LT3762HFE#TRPBF implement open-LED protection?
The LT3762HFE#TRPBF asserts the OPENLED flag when FB exceeds VFB–50mV (typical) *and* ISP–ISN falls below 25mV (C/10 threshold). This dual-condition detection prevents false triggers during transient load changes and ensures reliable open-circuit identification in constant-current mode.
Can the LT3762HFE#TRPBF operate without an external PWM signal?
Yes - the LT3762HFE#TRPBF includes an internal PWM dimming generator. By connecting a capacitor between PWM and GND and applying a voltage to DIM (0.4V–3.0V), it produces self-timed dimming waveforms with duty ratios from 0.4% to 97%, eliminating the need for an external PWM source.
What is the purpose of the SSFM pin on the LT3762HFE#TRPBF?
The SSFM pin on the LT3762HFE#TRPBF enables spread-spectrum frequency modulation. When a capacitor is connected from SSFM to GND, it generates a triangle ramp that modulates the switching frequency by ±30%, significantly reducing peak EMI emissions to help meet CISPR-15 and EN55015 standards.
LT3762HFE#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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3762HFE#TRPBF FAQ
1.How can I place an order for LT3762HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762HFE#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 LT3762HFE#TRPBF reliable?
The price and inventory of LT3762HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3762HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762HFE#TRPBF?
LT3762HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762HFE#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 LT3762HFE#TRPBF?
For technical support, including LT3762HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762HFE#TRPBF requirements.
6.How does Aetrix verify that LT3762HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3762HFE#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 LT3762HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3762HFE#TRPBF?
All LT3762HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762HFE#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 LT3762HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3762HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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