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Analog Devices Inc. LTC3803MPS6-5#TRPBF
- Part No.:
- LTC3803MPS6-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3803MPS6-5#TRPBF.pdf
- Description:
- IC REG CTRLR FLYBACK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,311
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Product details
Overview
LTC3803MPS6-5#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode flyback DC/DC controller optimized for driving N-channel MOSFETs in high-input-voltage isolated power supplies. It operates from 5V to 50V input, delivers ±1.5% output voltage accuracy, maintains 200kHz switching across light-to-full load, and features internal soft-start, adjustable slope compensation, and ground-referenced current sensing. It is used in telecom housekeeping supplies and PoE auxiliary rails.
For engineers reviewing the LTC3803MPS6-5#TRPBF datasheet, LTC3803MPS6-5#TRPBF pinout, LTC3803MPS6-5#TRPBF application, or LTC3803MPS6-5#TRPBF equivalent, key selection criteria include its –55°C to 150°C operating junction temperature range, 240μA quiescent current, 4.8V UVLO turn-on threshold, and SOT-23-6 (ThinSOT™) package compatibility with space-constrained industrial and automotive auxiliary power designs.
Technical Context
The LTC3803MPS6-5#TRPBF implements fixed-frequency current-mode control using an internal 200kHz oscillator, error amplifier with 800mV reference, and peak-current comparator with programmable slope compensation via external resistor on the SENSE pin. Its ITH/RUN pin serves dual roles: error amplifier compensation node and run/shutdown control with 0.28V shutdown threshold.
It features an internal VCC shunt regulator clamping at ~8.1V (1mA–25mA), enabling direct high-VIN biasing through a single resistor, and supports gate drive up to 1A peak for external N-MOSFETs. The NGATE output swings rail-to-rail (0V to VCC), and the SENSE pin monitors source-side current while injecting a linear 0–5μA ramp for duty-cycle-dependent slope compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 200kHz typical; enables predictable EMI filtering and stable loop response without frequency foldback at light loads. |
| Output Voltage Accuracy | ±1.5% over temperature; ensures tight regulation for sensitive analog or digital supply rails without post-regulation. |
| Quiescent Current | 240μA typical; minimizes no-load power loss in always-on auxiliary supplies such as PoE or telecom standby rails. |
| VCC UVLO Threshold | 4.8V turn-on / 4.0V turn-off; prevents unreliable MOSFET gate drive during brownout conditions in wide-input industrial systems. |
| Junction Temp Range | –55°C to +150°C; qualified for extended-temperature applications including under-hood automotive and downhole industrial equipment. |
| Peak Gate Drive Current | 1A peak (<10μs); supports fast switching of medium-power N-MOSFETs (e.g., FDC2512) with low propagation delay. |
| Reference Voltage | 0.788V to 0.812V (–55°C to +150°C); stable internal 800mV bandgap reference enables precise feedback divider design. |
Pinout & Package
Package: 6-lead low-profile (1mm height) TSOT-23 (ThinSOT™), JEDEC MO-193 compliant, rated for TJ = –55°C to +150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & shutdown control | Sets current comparator threshold; pulled to ~0.7V at startup; <0.28V forces shutdown; hosts RC compensation network. |
| GND (Pin 2) | Analog and power ground reference | Common return for VFB, SENSE, and internal regulators; must be low-impedance connection to minimize noise coupling. |
| VFB (Pin 3) | Feedback input | Compares resistive divider output against 800mV reference; 10nA input bias enables high-value dividers for low quiescent loss. |
| SENSE (Pin 4) | Current sense input & slope ramp source | Monitors voltage across external RSENSE; injects 0–5μA linear ramp for duty-cycle-dependent slope compensation when RSL is present. |
| VCC (Pin 5) | Supply input with internal shunt regulator | Internally clamped to ~8.1V; accepts up to 25mA shunt current; requires local 10μF ceramic bypass to GND. |
| NGATE (Pin 6) | N-MOSFET gate driver output | Push-pull output swinging 0V to VCC; 40ns rise/fall time into 3000pF; drives gate charge directly without external buffer. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency operation | Maintains 200kHz switching from 20mA to full load, eliminating sub-audio noise and simplifying EMI filter design. |
| Ground-referenced current sensing | Enables high-side primary-side sensing without level-shifting; supports input voltages beyond IC absolute maximum ratings. |
| Internal soft-start | Clamps ITH/RUN for ~0.7ms at power-up, limiting inrush current and preventing transformer saturation during startup. |
| Adjustable slope compensation | External RSL sets ramp magnitude; stabilizes current-mode control above 50% duty cycle without requiring opto-isolator feedback. |
| VCC shunt regulator | Self-regulates VCC to ~8.1V from VIN up to 50V via single series resistor; eliminates need for external LDO or bias winding. |
Applications
| Telecom Housekeeping Supply | Automotive Auxiliary Power |
|---|---|
|
Use Scenario: Isolated 12V/100mA standby rail in 36–75V telecom line cards, powering monitoring ICs and interface logic. IC Role / Device Role / Timing Role: Primary-side flyback controller managing MOSFET switching, current sensing, and output regulation without optocoupler. Use Value: 240μA quiescent current extends system standby time; ±1.5% accuracy ensures reliable microcontroller reset signaling. |
Use Scenario: 5V/1.2A isolated auxiliary supply in 12V/24V automotive ECUs, powering CAN transceivers and sensor interfaces. IC Role / Device Role / Timing Role: Constant-frequency flyback controller with –55°C to +150°C qualification, handling cold-crank and load-dump transients. Use Value: Internal VCC shunt allows direct VIN biasing; 4.8V UVLO prevents erratic operation during battery voltage sag below 6V. |
| Power over Ethernet (PoE) | Industrial Isolated Sensor Interface |
|
Use Scenario: 3.3V/3A isolated secondary-side supply derived from PoE midspan 48V input, powering PHY and MAC layers. IC Role / Device Role / Timing Role: Primary-side controller implementing synchronous rectification-ready flyback topology with precise current limit. Use Value: 200kHz fixed frequency enables compact magnetics; slope compensation support ensures stability across full 4:1 input range (18–72V). |
Use Scenario: 15V/200mA isolated supply for analog front-end in hazardous-area field transmitters powered from 24V loop. IC Role / Device Role / Timing Role: High-reliability flyback controller with extended temperature rating, supporting long-life deployments in unventilated enclosures. Use Value: 150°C max junction temperature enables operation in sealed enclosures; low 240μA IQ reduces self-heating in thermally constrained spaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3805ES6-5#TRPBF | Adjustable frequency (100–600kHz), higher 350μA IQ, same SOT-23-6 package and –40°C to +125°C rating. | Used where EMI tuning or higher efficiency at light load is required; lacks MP-grade temperature range. | Select when frequency flexibility outweighs extended temperature needs and lowest IQ is not critical. |
| LTC3873ES6-5#TRPBF | No external current sense resistor required; uses valley-current sensing; 250μA IQ; same package but only rated to +125°C. | Preferred for cost-sensitive designs eliminating RSENSE and associated PCB area; less suitable for high-precision current limiting. | Choose when minimizing BOM count and layout area is prioritized over programmable current limit threshold and extended temp operation. |
Compared with LTC3803MPS6-5#TRPBF, LTC3805ES6-5#TRPBF offers frequency adjustability at the cost of higher quiescent current and reduced temperature range, while LTC3873ES6-5#TRPBF eliminates the sense resistor but sacrifices precision current control and extended-temperature capability.
Availability
LTC3803MPS6-5#TRPBF is available at Aetrix Electronics and suitable for telecom housekeeping supplies, automotive auxiliary power rails, and Power over Ethernet (PoE) interface modules requiring stable component supply across extended temperature ranges.
Supply support for LTC3803MPS6-5#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 healthcare markets.
The LTC3803 family was designed specifically for compact, high-efficiency isolated flyback converters in space- and thermal-constrained environments, emphasizing low IQ, wide input range, and robust operation without optocouplers or third-winding feedback.
FAQ
What is the operating temperature range of the LTC3803MPS6-5#TRPBF?
The LTC3803MPS6-5#TRPBF is specified for a junction temperature range of –55°C to +150°C, making it suitable for extreme-environment applications such as under-hood automotive systems and industrial control cabinets. This MP-grade qualification exceeds standard commercial and industrial grades, and is verified per the manufacturer's test flow for extended-temperature reliability.
How does the LTC3803MPS6-5#TRPBF achieve constant-frequency operation at light loads?
The LTC3803MPS6-5#TRPBF maintains constant 200kHz switching down to very light loads by using a free-running oscillator that is not gated or skipped - unlike burst-mode controllers. This eliminates low-frequency output ripple and audible noise, which is critical in noise-sensitive telecom and instrumentation applications where the LTC3803MPS6-5#TRPBF is commonly deployed.
Can the LTC3803MPS6-5#TRPBF be powered directly from a high input voltage like 48V?
Yes - the LTC3803MPS6-5#TRPBF includes an internal VCC shunt regulator that clamps the supply pin to ~8.1V. When biased from 48V via a series resistor (e.g., 4.7kΩ), it draws up to 25mA to regulate VCC, eliminating the need for an external LDO or auxiliary winding. This feature is explicitly supported in the LTC3803MPS6-5#TRPBF datasheet and validated in typical application circuits.
What is the purpose of the SENSE pin on the LTC3803MPS6-5#TRPBF?
The SENSE pin on the LTC3803MPS6-5#TRPBF serves two functions: (1) it senses voltage across an external current-sense resistor to monitor MOSFET peak current, and (2) it sources a linear 0–5μA ramp current used for slope compensation when an external resistor (RSL) is connected. This dual role enables stable current-mode control across wide duty cycles in the LTC3803MPS6-5#TRPBF.
Does the LTC3803MPS6-5#TRPBF require an external optocoupler for feedback isolation?
No - the LTC3803MPS6-5#TRPBF uses primary-side regulation: output voltage is sensed via a resistive divider referenced to the secondary ground, and feedback is returned across the transformer via an auxiliary winding or capacitive coupling. Its ground-referenced architecture eliminates the need for optocouplers or third-winding feedback, reducing cost and improving reliability in the LTC3803MPS6-5#TRPBF-based designs.
LTC3803MPS6-5#TRPBF 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):
- 4V ~ 8.1V
- 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
LTC3803MPS6-5#TRPBF FAQ
1.How can I place an order for LTC3803MPS6-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3803MPS6-5#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 LTC3803MPS6-5#TRPBF reliable?
The price and inventory of LTC3803MPS6-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3803MPS6-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3803MPS6-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3803MPS6-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3803MPS6-5#TRPBF?
LTC3803MPS6-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3803MPS6-5#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 LTC3803MPS6-5#TRPBF?
For technical support, including LTC3803MPS6-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3803MPS6-5#TRPBF requirements.
6.How does Aetrix verify that LTC3803MPS6-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3803MPS6-5#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 LTC3803MPS6-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3803MPS6-5#TRPBF?
All LTC3803MPS6-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3803MPS6-5#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 LTC3803MPS6-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3803MPS6-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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