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Analog Devices Inc. LTC3803MPS6#TRMPBF
- Part No.:
- LTC3803MPS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3803MPS6#TRMPBF.pdf
- Description:
- IC REG CTRLR FLYBACK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,831
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Product details
Overview
LTC3803MPS6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode flyback DC/DC controller optimized for high-input-voltage N-channel MOSFET drive in isolated and non-isolated telecom housekeeping supplies. It delivers ±1.5% output voltage accuracy, 200kHz fixed switching frequency, 240μA quiescent current, and operates across –55°C to 150°C junction temperature. Used in 36V–72V telecom power rails to generate stable 5V/2A auxiliary outputs.
For engineers reviewing the LTC3803MPS6#TRMPBF datasheet, LTC3803MPS6#TRMPBF pinout, LTC3803MPS6#TRMPBF application, or LTC3803MPS6#TRMPBF equivalent, key selection criteria include its wide-temperature MP-grade qualification, internal shunt-regulated VCC supply, programmable slope compensation, ground-referenced current sensing, and absence of minimum load requirement - all critical for ruggedized telecom and automotive auxiliary power designs.
Technical Context
The LTC3803MPS6#TRMPBF implements a current-mode control architecture with a 200kHz free-running oscillator, peak-current sensing via the SENSE pin, and an error amplifier whose output at ITH/RUN sets the current comparator threshold. Its internal soft-start clamps ITH/RUN for ~1.4ms at power-up to limit inrush.
It features dual shutdown mechanisms: undervoltage lockout (VTURNON = 7.6V, VTURNOFF = 4.0V, hysteresis = 3.0V) and external forced shutdown via ITH/RUN < 0.28V. The VCC pin includes a self-regulating shunt (9.4V–10.5V at 1–25mA), enabling direct high-VIN biasing through a resistor without external regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 200kHz typical; enables predictable EMI filtering and consistent transient response across load range. |
| Output Voltage Accuracy | ±1.5% over full temperature range; ensures stable regulation for sensitive downstream logic and analog circuitry. |
| Quiescent Current | 240μA typical; minimizes no-load power loss in always-on auxiliary supplies. |
| VCC Shunt Regulator | 9.4V–10.5V clamp at 1–25mA; allows direct high-VIN biasing (e.g., 48V/72V) with single dropping resistor and bypass cap. |
| Junction Temp Range | –55°C to +150°C; qualified for extended-temperature industrial, aerospace, and under-hood automotive applications. |
| Peak Sense Voltage | 85–120mV (MP grade); sets precise current limit threshold with low-loss external sense resistors. |
| Slope Compensation | 5μA programmable ramp injected at SENSE pin; stabilizes duty cycle >50% operation without external op-amp. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (1) | Error amplifier output & shutdown control | Sets current comparator threshold (0.7–1.9V); pulled low (<0.28V) forces shutdown; hosts RC compensation network. |
| GND (2) | Power and signal reference | Ground return for VCC, NGATE, SENSE, and feedback loop; must be low-impedance for stable current sensing. |
| VFB (3) | Feedback input | Compares output divider voltage to 800mV internal reference; 10nA input bias enables high-value resistive dividers. |
| SENSE (4) | Current sense & slope compensation injection | Monitors external RSENSE voltage; injects 5μA linear ramp for duty-cycle-dependent compensation when RSL is present. |
| VCC (5) | Supply input with internal shunt regulator | Accepts 7.6–10.5V; internal clamp regulates to ~9.5V; draws only 240μA in operation; supports resistor-fed high-VIN biasing. |
| NGATE (6) | N-channel MOSFET gate driver | Push-pull output swinging 0V to VCC; 40ns rise/fall into 3000pF; drives external high-side switch in flyback/boost topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current mode control | Enables predictable EMI signature and excellent line/load transient response without minimum load requirement. |
| Ground-referenced current sensing | Allows primary-side sensing with low-side RSENSE placement, simplifying layout and avoiding high-side current sense ICs. |
| Micropower hysteretic start-up | Supports efficient bootstrapped operation from transformer bias winding; eliminates need for dedicated start-up supply. |
| Internal soft-start | 1.4ms controlled ITH/RUN ramp prevents output overshoot and limits inrush current during cold start. |
| Adjustable slope compensation | 5μA programmable ramp via external RSL eliminates subharmonic oscillation in continuous conduction mode flyback. |
Applications
| Telecom Housekeeping Supply | Automotive Auxiliary Power |
|---|---|
Use Scenario: Generating 5V/2A from 36–72V telecom battery bus for FPGA configuration, PMIC sequencing, and monitoring ICs. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output using third-winding VCC bias and ground-referenced RSENSE. Use Value: ±1.5% accuracy and 240μA quiescent current ensure reliable low-power startup and stable rail integrity across wide temperature and input variation. |
Use Scenario: Deriving 5V/1A auxiliary supply from 42V stop-start battery system for infotainment MCU and CAN transceivers. IC Role / Device Role / Timing Role: Non-isolated boost/flyback controller operating across –40°C to +150°C ambient with internal VCC shunt regulation. Use Value: –55°C to +150°C MP-grade qualification and 3.0V UVLO hysteresis prevent brownout-induced resets during cold cranking or hot soak. |
| Power over Ethernet (PoE) PD Interface | Industrial Control System PSU |
Use Scenario: Providing regulated 3.3V/1.5A from PoE Class 4 (57V) input for Ethernet PHY, microcontroller, and sensor interface. IC Role / Device Role / Timing Role: Constant-frequency flyback controller with programmable slope compensation for stable operation at up to 80% duty cycle. Use Value: Adjustable slope compensation and 200kHz fixed frequency simplify EMI compliance in space-constrained PoE-powered devices. |
Use Scenario: Generating isolated 12V/0.5A housekeeping rail from 24VDC industrial bus for PLC I/O modules and fieldbus transceivers. IC Role / Device Role / Timing Role: High-reliability flyback controller with internal soft-start and no minimum load requirement for unattended operation. Use Value: Internal shunt-regulated VCC eliminates external LDO, reducing BOM count and improving long-term reliability in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28C43DR | Fixed 200kHz frequency, but only rated for –40°C to +125°C; lacks internal VCC shunt regulator; requires external bias supply. | Not suitable for extended-temperature or resistor-fed high-VIN applications; higher system complexity due to external VCC management. | Select only if operating within commercial temp range and external bias is already available. |
| MAX5021ASA+ | Current-mode flyback controller with 250kHz frequency; –40°C to +125°C rating; no integrated VCC shunt; 300μA quiescent current. | Higher IQ and narrower temp range reduce efficiency and reliability in telecom/aerospace use cases requiring –55°C operation. | Consider only for cost-sensitive, non-extended-temp designs where 250kHz switching is acceptable. |
Compared with UCC28C43DR and MAX5021ASA+, the LTC3803MPS6#TRMPBF uniquely combines MP-grade temperature qualification, internal VCC shunt regulation, and ground-referenced sensing - enabling simpler, more robust high-input-voltage flyback designs without external bias or high-side sense circuitry.
Availability
LTC3803MPS6#TRMPBF is available at Aetrix Electronics and suitable for telecom housekeeping supplies, automotive auxiliary power systems, and industrial control PSUs requiring stable component supply across extended temperature ranges and high-reliability operation.
Supply support for LTC3803MPS6#TRMPBF 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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification standards and long-term product support.
The LTC3803 series was designed specifically for high-input-voltage flyback and boost converters in telecom, automotive, and industrial applications where simplicity, reliability, and extended temperature operation are essential.
FAQ
What is the operating temperature range of the LTC3803MPS6#TRMPBF?
The LTC3803MPS6#TRMPBF is an MP-grade part qualified for operation from –55°C to +150°C junction temperature. This extended range supports deployment in aerospace, under-hood automotive, and industrial environments where standard commercial or industrial grades would fail. The device is tested and guaranteed across this full range, unlike E/I/H grades which have narrower specifications.
How does the LTC3803MPS6#TRMPBF achieve VCC regulation without an external LDO?
The LTC3803MPS6#TRMPBF integrates a shunt regulator on the VCC pin that clamps voltage to 9.4V–10.5V across 1–25mA load current. This allows direct connection to high-VIN sources (e.g., 48V or 72V) via a single series resistor and bypass capacitor - eliminating the need for external LDOs or bias windings in simple applications while maintaining robust overvoltage protection.
Can the LTC3803MPS6#TRMPBF be used in non-isolated boost configurations?
Yes, the LTC3803MPS6#TRMPBF supports both isolated flyback and non-isolated boost topologies. Its ground-referenced current sensing, constant-frequency current-mode control, and ability to operate with VIN well beyond its own absolute maximum ratings make it suitable for high-input-voltage boost converters - such as generating 12V from a 42V automotive bus - provided external components are appropriately rated.
What is the purpose of the SENSE pin's programmable slope compensation current?
The SENSE pin of the LTC3803MPS6#TRMPBF sources a linear 5μA ramp current (0–5μA between 6% and 80% duty cycle) into an external resistor (RSL). This develops a duty-cycle-proportional voltage that adds to the current sense signal, preventing subharmonic oscillation in continuous conduction mode - especially critical in flyback designs with duty cycles exceeding 50%.
Does the LTC3803MPS6#TRMPBF require a minimum load to maintain regulation?
No, the LTC3803MPS6#TRMPBF has no minimum load requirement. Its constant-frequency current-mode architecture maintains stable regulation from zero load to full rated output, making it ideal for standby and low-power wake-up circuits in telecom and industrial systems where auxiliary rails must remain active even during deep sleep modes.
LTC3803MPS6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 5.7V ~ 8V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- 80%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3803MPS6#TRMPBF FAQ
1.How can I place an order for LTC3803MPS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3803MPS6#TRMPBF 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 LTC3803MPS6#TRMPBF reliable?
The price and inventory of LTC3803MPS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3803MPS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3803MPS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3803MPS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3803MPS6#TRMPBF?
LTC3803MPS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3803MPS6#TRMPBF 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 LTC3803MPS6#TRMPBF?
For technical support, including LTC3803MPS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3803MPS6#TRMPBF requirements.
6.How does Aetrix verify that LTC3803MPS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3803MPS6#TRMPBF 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 LTC3803MPS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3803MPS6#TRMPBF?
All LTC3803MPS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3803MPS6#TRMPBF, 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 LTC3803MPS6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3803MPS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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