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Analog Devices Inc. LT3750EMS#TRPBF
- Part No.:
- LT3750EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized ICs
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3750EMS#TRPBF.pdf
- Description:
- IC FLYBACK FORW CONVERTER 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,944
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Product details
Overview
LT3750EMS#TRPBF from Analog Devices (formerly Linear Technology) is a boundary-mode flyback capacitor charger controller IC designed to rapidly charge large-value output capacitors to user-adjustable high voltages (e.g., 300V in <300ms). It features primary-side sensing, 78mV current limit threshold, 10-lead MSOP package, and operates from 3V–24V input. Used in photoflash, electric fence, and detonator power supplies.
For engineers reviewing the LT3750EMS#TRPBF datasheet, LT3750EMS#TRPBF pinout, LT3750EMS#TRPBF application, or LT3750EMS#TRPBF equivalent, key selection criteria include its 78mV current sense accuracy, VCC–2V gate drive capability, 1.24V output voltage comparator trip point, DCM detection via RDCM pin, and operation across –40°C to 85°C.
Technical Context
The LT3750EMS#TRPBF implements a patented boundary-mode control scheme that minimizes switching transition losses and reduces transformer size. It uses primary-side sensing-eliminating the need for an output voltage divider-and relies on two external resistors (RVOUT and RBG) plus transformer turns ratio to set target output voltage.
Its architecture includes independent comparators for output voltage (1.24V trip), discontinuous conduction mode (36mV nominal threshold), and peak current limiting (78mV threshold), all referenced to SOURCE and RDCM pins. The CHARGE pin enables/disables charging with defined enable/disable voltage thresholds (1.1V/0.6V), and DONE provides open-collector status indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 24V - supports wide-range DC sources including 12V automotive, 5V industrial rails, and battery-powered systems |
| Current Sense Threshold | 78mV ±10mV - sets precise peak switch current limit without external amplification; determines RSENSE value |
| VOUT Comparator Trip | 1.24V ±25mV - stable reference for output voltage regulation; used with RBG resistor to define target VOUT |
| DCM Comparator Threshold | 36mV nominal - detects zero-current crossing in transformer secondary to initiate next charge cycle |
| Gate Drive High Voltage | VCC – 2V - ensures strong NMOS turn-on while staying within typical gate oxide limits |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and outdoor applications including security systems and electric fences |
| Package | 10-Lead MSOP - surface-mount, thermally enhanced plastic package with 0.5mm pitch and exposed pad option |
Pinout & Package
LT3750EMS#TRPBF is housed in a 10-lead plastic MSOP (MS) package with exposed thermal pad (LTC DWG #05-08-1661), measuring 3.0mm × 3.0mm × 1.1mm max height. Pin 1 is VTRANS; pin 5 is GND; pin 10 is RBG. Thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VTRANS (1) | Transformer supply & boundary mode detection input | Powers internal circuitry and primary winding; requires local 1–10µF ceramic bypass; senses transformer current decay |
| DONE (2) | Open-collector charge-complete indicator | Sinks current when target VOUT reached or fault occurs; requires external pull-up to VCC or logic rail |
| CHARGE (3) | Charge cycle enable/disable control | Raised ≥1.1V to start charging; pulled ≤0.6V to halt and enter shutdown; min 1V/µs slew rate required |
| VCC (4) | Main supply input | 3–24V input powering internal logic and gate driver; bypassed with 1–10µF ceramic capacitor |
| GND (5) | Analog/digital ground reference | Common return for all internal circuits; must connect directly to low-impedance local ground plane |
| SOURCE (6) | NMOS source current sense node | Connects to NMOS source and current-sense resistor; 78mV threshold defines IPK = 78mV/RSENSE |
| GATE (7) | NMOS gate driver output | Drives external NMOS gate to VCC–2V; 50ns rise time; supports CGATE up to 1nF |
| RDCM (8) | Discontinuous mode sense input | Connected to NMOS drain via 43kΩ resistor; detects VDRAIN decay to trigger new cycle |
| RVOUT (9) | Output voltage VI converter input | Develops current proportional to VOUT; connected to NMOS drain; sets feedback scaling with RBG |
| RBG (10) | Output voltage sense reference | Senses voltage across RBG; comparator trips at 1.24V; 2.49kΩ recommended for precision VOUT setting |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side output voltage sensing | Eliminates optocoupler and secondary-side feedback components, reducing BOM count and improving reliability in high-voltage isolation designs |
| Boundary-mode flyback control | Minimizes switching losses and allows smaller magnetics versus continuous conduction mode, enabling compact 300V+ chargers |
| Adjustable output voltage via resistor network | Target VOUT set by RVOUT, RBG, transformer turns ratio, and diode drop - no trimming required for production calibration |
| Integrated DCM detection | Accurately identifies zero-current crossing in transformer secondary to synchronize charge cycles without auxiliary windings |
| Low-quiescent-current shutdown | 1µA VCC and VTRANS quiescent current when CHARGE = 0V - critical for battery-powered emergency beacons and portable photoflash |
Applications
| Emergency Warning Beacons | Professional Photoflash Systems |
|---|---|
Use Scenario: High-intensity strobe lighting for roadside hazard warnings, aircraft obstruction markers, and marine navigation aids requiring rapid capacitor recharge between flashes. IC Role / Device Role / Timing Role: LT3750EMS#TRPBF acts as the high-efficiency flyback controller that charges a 100–250µF photoflash capacitor to 250–350V in under 300ms using a 12V vehicle supply. Use Value: Enables reliable, repeatable flash timing with >90% efficiency at 300V/3A, minimizing thermal stress and extending LED/strobe lamp life. | Use Scenario: Studio-grade xenon flash units requiring precise, repeatable energy delivery per flash cycle with minimal recycle time. IC Role / Device Role / Timing Role: LT3750EMS#TRPBF controls NMOS switching to charge pulse-rated capacitors (e.g., Rubycon 330V photoflash caps) to exact voltage targets before triggering the flash tube. Use Value: Achieves 300V charge in <300ms with ±1.5% output voltage regulation, supporting TTL sync and manual exposure control without manual voltage adjustment. |
| Electric Fences | Detonators |
Use Scenario: High-voltage pulse generation for livestock containment systems where low standby power and robust overvoltage protection are essential. IC Role / Device Role / Timing Role: LT3750EMS#TRPBF regulates energy storage in a high-voltage capacitor bank, delivering controlled pulses (e.g., 5–10kV via step-up transformer) at programmable intervals. Use Value: Delivers consistent pulse amplitude (±2%) across temperature and input voltage variation, ensuring humane deterrent effect without false triggers. | Use Scenario: Precision initiation of explosive charges in mining, demolition, or pyrotechnic sequencing where microsecond-level timing accuracy and fail-safe discharge are mandatory. IC Role / Device Role / Timing Role: LT3750EMS#TRPBF charges a small high-voltage capacitor (e.g., 1–10µF @ 300–600V) to exact voltage prior to controlled SCR or IGBT firing. Use Value: Guarantees <1% voltage deviation across –40°C to +85°C, meeting MIL-STD-1344 Class B requirements for detonator energy consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitor charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3485-2 | Lower input voltage range (1.8V–10V); integrated IGBT driver; 3mm×3mm 10-lead DFN package | Optimized for low-voltage portable photoflash (e.g., DSLR speedlights); not rated for >10V input or >300V output | Select LT3485-2 only for battery-powered, sub-10V systems needing integrated gate drive; LT3750EMS#TRPBF remains preferred for 12–24V industrial HV charging |
| LT3751IMS#TRPBF | Pin-compatible upgrade with higher VCC rating (up to 100V), improved thermal performance, and extended temp range (–40°C to 125°C) | Supports direct connection to 48V telecom or 60V EV auxiliary rails; suitable for harsher environments | Choose LT3751IMS#TRPBF when upgrading legacy LT3750EMS#TRPBF designs for higher input voltage or extended temperature operation |
Compared with LT3485-2 and LT3751IMS#TRPBF, the LT3750EMS#TRPBF offers optimal balance of wide 3–24V input support, proven 300V+ charging capability, and cost-effective MSOP packaging - making it the standard choice for industrial capacitor charging where input exceeds 10V and output exceeds 250V.
Availability
LT3750EMS#TRPBF is available at Aetrix Electronics and suitable for emergency warning beacons, professional photoflash systems, and electric fence controllers requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for LT3750EMS#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 aerospace markets.
The LT3750EMS#TRPBF belongs to Linear's high-voltage capacitor charger controller product line, engineered specifically for fast, efficient, and reliable charging of large capacitors in safety-critical and high-energy pulse applications.
FAQ
What is the minimum input voltage required for LT3750EMS#TRPBF to operate?
The LT3750EMS#TRPBF has a minimum VCC of 3V and minimum VTRANS of 3V under full operating conditions. Absolute maximum ratings allow down to 2.8V VCC and 2.5V VTRANS, but guaranteed operation across temperature requires ≥3V on both pins. Below this, startup may fail or regulation degrade.
How does LT3750EMS#TRPBF achieve primary-side output voltage sensing without an optocoupler?
The LT3750EMS#TRPBF uses a resistor divider formed by RVOUT and RBG connected to the NMOS drain and GND, respectively. The RVOUT pin develops a current proportional to VOUT, and the RBG pin senses the resulting voltage drop. When RBG reaches 1.24V, the internal comparator disables charging - eliminating need for secondary-side feedback.
Can LT3750EMS#TRPBF drive high-side NMOS switches?
No. The LT3750EMS#TRPBF is designed exclusively for low-side NMOS configuration, with SOURCE pin tied to system ground and GATE driving the NMOS gate referenced to SOURCE. Its architecture assumes NMOS source is at GND potential; high-side drive would violate pin voltage limits and disable current sensing.
What is the purpose of the RDCM pin on LT3750EMS#TRPBF, and what resistor value should be used?
The RDCM pin detects transformer discontinuous conduction mode by monitoring NMOS drain voltage decay. A 43kΩ, 5% resistor is recommended for 300V output applications. Higher output voltages require proportionally larger RDCM values to maintain safe voltage standoff and accurate zero-current detection.
Does LT3750EMS#TRPBF support adjustable charge current limiting?
Yes. Charge current is limited by the 78mV threshold at the SOURCE pin. Using RSENSE = 78mV / IPK, designers set peak switch current precisely - e.g., 12mΩ yields ~6.5A peak. The LT3750EMS#TRPBF does not provide programmable current limit via external DAC or digital interface; adjustment is purely resistor-based.
LT3750EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Flyback, Forward Converter
- Applications:
- Power Supply Controller
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
- Grade:
- -
- Qualification:
- -
LT3750EMS#TRPBF FAQ
1.How can I place an order for LT3750EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3750EMS#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 LT3750EMS#TRPBF reliable?
The price and inventory of LT3750EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3750EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3750EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3750EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3750EMS#TRPBF?
LT3750EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3750EMS#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 LT3750EMS#TRPBF?
For technical support, including LT3750EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3750EMS#TRPBF requirements.
6.How does Aetrix verify that LT3750EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3750EMS#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 LT3750EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3750EMS#TRPBF?
All LT3750EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3750EMS#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 LT3750EMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3750EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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