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Analog Devices Inc. LTC3803MPS6-3#TRPBF
- Part No.:
- LTC3803MPS6-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3803MPS6-3#TRPBF.pdf
- Description:
- IC REG CTRLR FLYBACK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
LTC3803MPS6-3#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode flyback DC/DC controller in a 6-lead ThinSOT™ package, optimized for driving N-channel MOSFETs in high-input-voltage telecom and automotive housekeeping supplies. It delivers ±1.5% output voltage accuracy, 300kHz fixed switching frequency, 240μA quiescent current, –55°C to 150°C operating temperature range, and ground-referenced current sensing enabling input voltages beyond its VCC rating.
For engineers reviewing the LTC3803MPS6-3#TRPBF datasheet, LTC3803MPS6-3#TRPBF pinout, LTC3803MPS6-3#TRPBF application, or LTC3803MPS6-3#TRPBF equivalent, key selection considerations include its wide-temperature-grade operation, programmable slope compensation, internal soft-start, undervoltage lockout with 1V+ hysteresis, and compatibility with high-VIN bias winding or resistor-fed startup schemes.
Technical Context
The LTC3803MPS6-3#TRPBF implements a current-mode control architecture with a 300kHz 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 shunt regulator clamps VCC to ~9.5V, supporting direct resistor-fed operation from VIN up to 72V.
It features micropower hysteretic start-up, internal soft-start (1.4ms), adjustable slope compensation via external RSL, and dual shutdown mechanisms: VCC undervoltage lockout (VTURNON = 7.5V, VTURNOFF = 4.0V) and ITH/RUN forced shutdown (VITHSHDN = 0.09V). The device operates across –55°C to 150°C junction temperature and enforces 8–80% duty cycle limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 300kHz fixed - ensures predictable EMI profile and simplifies filter design |
| Output Voltage Accuracy | ±1.5% - enables tight regulation without post-regulation in telecom auxiliary rails |
| Quiescent Current | 240μA - minimizes no-load power loss in always-on housekeeping supplies |
| Operating Temperature | –55°C to 150°C - qualified for extended-range automotive and industrial environments |
| VCC UVLO Thresholds | VTURNON = 7.5V, VTURNOFF = 4.0V - supports reliable bias-winding startup with >3.5V hysteresis |
| Peak Sense Voltage | 85mV (min) - sets current limit with low-loss external sense resistors down to ~20mΩ |
| Soft-Start Time | 1.4ms - prevents inrush current in multi-rail systems during cold start |
Pinout & Package
Package: 6-lead Plastic TSOT-23 (ThinSOT™), 1mm profile, lead-free finish, –55°C to 150°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & shutdown control | Sets current comparator threshold; pulled low (<0.09V) forces shutdown; clamped to ~0.7V at startup |
| GND (Pin 2) | Power and signal reference | Ground return for VCC, NGATE, SENSE, and feedback network; must be low-impedance |
| VFB (Pin 3) | Feedback input | Compares output-derived voltage to 0.8V internal reference; 10nA input current enables high-value dividers |
| SENSE (Pin 4) | Current sense & slope compensation injection | Detects MOSFET source voltage; sources 0–5μA ramp for external slope compensation resistor (RSL) |
| VCC (Pin 5) | Supply input with internal shunt regulator | Internally regulated to ~9.5V; accepts up to 25mA sink current; requires ≥1μF local ceramic bypass |
| NGATE (Pin 6) | N-channel MOSFET gate driver | Push-pull output swinging 0V to VCC; 1A peak drive capability; 40ns rise/fall times into 3000pF |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Enables stable loop response across line/load transients without minimum load requirement |
| Ground-referenced current sensing | Allows use of low-side sense resistor - eliminates need for isolated sense or high-side driver |
| Programmable slope compensation | 5μA linear ramp injected at SENSE pin enables stabilization of duty cycles >50% in flyback designs |
| Micropower hysteretic start-up | Draws only 40μA during startup - enables efficient bootstrap from bias winding in high-VIN applications |
| Internal VCC shunt regulator | Regulates VCC to ~9.5V with up to 25mA sink - permits simple resistor-fed operation from 36–72V telecom rails |
Applications
| Telecom Housekeeping Supply | Automotive 42V Auxiliary Rail |
|---|---|
|
Use Scenario: Nonisolated 5V/2A auxiliary supply in telecom line cards powered from 36–72V backplane. IC Role / Device Role / Timing Role: Flyback controller managing primary-side switching, current sensing, and output regulation. Use Value: ±1.5% accuracy and 240μA quiescent current ensure stable, low-power rail generation without secondary-side feedback components. |
Use Scenario: 12V housekeeping supply in commercial vehicle ECUs operating from 24V nominal battery with 42V load-dump tolerance. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller driving external N-MOSFET in flyback topology. Use Value: –55°C to 150°C rating and robust UVLO (7.5V turn-on) support reliable cold-cranking and hot under-hood operation. |
| Power over Ethernet (PoE) PD | Industrial Isolated Bias Supply |
|
Use Scenario: Auxiliary 3.3V/1A supply for PoE-powered devices using single-ended flyback with integrated transformer. IC Role / Device Role / Timing Role: Primary-side controller providing regulation, current limiting, and soft-start for IEEE 802.3af/at compliance. Use Value: Internal soft-start (1.4ms) and programmable slope compensation prevent inrush and subharmonic oscillation in compact PoE modules. |
Use Scenario: Isolated 15V bias supply for gate drivers in motor control inverters, powered from 400V DC bus. IC Role / Device Role / Timing Role: High-VIN flyback controller enabling galvanic isolation with minimal external components. Use Value: Ground-referenced sensing and VCC clamp allow safe operation with input referenced to high-voltage bus - no level-shifting required. |
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 275kHz frequency; 1.5A gate drive; no internal VCC shunt regulator; 0.3V current sense threshold | Requires external VCC regulation; less suitable for resistor-fed high-VIN startup | Prefer when higher gate drive current is needed and external bias is available |
| MAX17595ATP+ | 4.5–60V input range; 400kHz max frequency; integrated 1.5A MOSFET driver; no programmable slope compensation | Higher integration but lacks wide-temp grade and flexible slope compensation | Prefer for space-constrained designs where 150°C operation is not required |
Compared with UCC28C43DR and MAX17595ATP+, the LTC3803MPS6-3#TRPBF uniquely combines –55°C to 150°C qualification, internal VCC shunt regulation for direct high-VIN startup, and user-programmable slope compensation - making it optimal for ruggedized telecom and automotive auxiliary supplies where reliability and design flexibility are critical.
Availability
LTC3803MPS6-3#TRPBF is available at Aetrix Electronics and suitable for telecom housekeeping supplies, automotive 42V auxiliary rails, and Power over Ethernet powered devices requiring stable component supply across extended temperature ranges.
Supply support for LTC3803MPS6-3#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3803 family is designed for high-input-voltage flyback and boost DC/DC controllers targeting telecom, automotive, and industrial auxiliary power applications where wide temperature range, low quiescent current, and flexible startup are essential.
FAQ
What is the operating temperature range of the LTC3803MPS6-3#TRPBF?
The LTC3803MPS6-3#TRPBF is specified for operation from –55°C to 150°C junction temperature, making it suitable for extreme-environment applications such as under-hood automotive systems and outdoor telecom equipment. This extended range is confirmed by full testing and qualification per the LTC3803MP-3 grade, distinct from the standard E/I/H grades.
How does the LTC3803MPS6-3#TRPBF achieve startup from high input voltages like 72V?
The LTC3803MPS6-3#TRPBF uses its internal VCC shunt regulator - which clamps VCC to ~9.5V - to enable direct startup from high VIN via a series resistor. It can sink up to 25mA through VCC to GND, allowing simple, robust resistor-fed operation without external regulators, as verified in the Absolute Maximum Ratings and Electrical Characteristics tables.
Does the LTC3803MPS6-3#TRPBF require an external slope compensation resistor?
No - the LTC3803MPS6-3#TRPBF includes an internal 5μA peak current ramp injected at the SENSE pin for slope compensation. An external resistor (RSL) is optional and only needed for duty cycles above 50% to prevent subharmonic oscillation; designs operating below 50% may short RSL, as stated in the Applications Information section.
What is the purpose of the ITH/RUN pin on the LTC3803MPS6-3#TRPBF?
The ITH/RUN pin on the LTC3803MPS6-3#TRPBF serves two functions: it acts as the error amplifier output (setting the current comparator threshold) and as the run/shutdown control input. Pulling it below 0.09V forces shutdown; during normal operation, its voltage varies from ~0.7V to 1.9V to command PWM duty cycle, as detailed in the Pin Functions section.
Can the LTC3803MPS6-3#TRPBF be used in isolated flyback topologies?
Yes - the LTC3803MPS6-3#TRPBF is explicitly designed for isolated flyback converters, as shown in the Typical Application schematic and described in the Applications Information. Its ground-referenced current sensing, VCC bias winding support, and programmable slope compensation make it well-suited for primary-side regulated isolated supplies.
LTC3803MPS6-3#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):
- 5.7V ~ 8V
- Frequency - Switching:
- 300kHz
- 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
LTC3803MPS6-3#TRPBF FAQ
1.How can I place an order for LTC3803MPS6-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3803MPS6-3#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 LTC3803MPS6-3#TRPBF reliable?
The price and inventory of LTC3803MPS6-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3803MPS6-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3803MPS6-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3803MPS6-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3803MPS6-3#TRPBF?
LTC3803MPS6-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3803MPS6-3#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 LTC3803MPS6-3#TRPBF?
For technical support, including LTC3803MPS6-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3803MPS6-3#TRPBF requirements.
6.How does Aetrix verify that LTC3803MPS6-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3803MPS6-3#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 LTC3803MPS6-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3803MPS6-3#TRPBF?
All LTC3803MPS6-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3803MPS6-3#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 LTC3803MPS6-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3803MPS6-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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