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Analog Devices Inc. LTC3803MPS6-5#TRMPBF
- Part No.:
- LTC3803MPS6-5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3803MPS6-5#TRMPBF.pdf
- Description:
- IC REG CTRLR FLYBACK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:447
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Product details
Overview
LTC3803MPS6-5#TRMPBF 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 auxiliary supplies and PoE housekeeping converters.
For engineers reviewing the LTC3803MPS6-5#TRMPBF datasheet, LTC3803MPS6-5#TRMPBF pinout, LTC3803MPS6-5#TRMPBF application, or LTC3803MPS6-5#TRMPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, 240μA quiescent current, 4.8V UVLO threshold, and SOT-23-6 (ThinSOT™) package with NGATE drive capability up to 1A peak.
Technical Context
The LTC3803MPS6-5#TRMPBF implements fixed-frequency (170–230kHz typ.) current-mode control using an internal 200kHz oscillator, error amplifier with 200–500μA/V transconductance, and current comparator referenced to the SENSE pin. Its ITH/RUN pin serves dual roles: feedback compensation node and shutdown control, with 0.08–0.47V shutdown threshold depending on grade.
It employs ground-referenced current sensing via the SENSE pin, supports programmable slope compensation via external resistor RSL, and integrates a VCC shunt regulator clamping at 8.1V (typ.) with 25mA max sink capability. The NGATE driver delivers 40ns rise/fall times into 3000pF loads and operates rail-to-rail (0V to VCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 200kHz typical; ensures stable EMI profile and enables compact magnetics without low-frequency noise at light loads. |
| Output Voltage Accuracy | ±1.5% over temperature; enables precise regulation in telecom and industrial auxiliary rails without post-regulation. |
| Quiescent Current | 240μA typical; minimizes no-load power loss in always-on housekeeping supplies. |
| VCC UVLO Threshold | 4.8V turn-on / 4.0V turn-off (typ.); prevents unreliable gate drive during brownout while enabling operation from 5V inputs. |
| Junction Temp Range | –55°C to +150°C; qualified for harsh automotive under-hood and industrial control cabinet environments. |
| Peak NGATE Drive | 1A peak for <10μs; sufficient to rapidly charge/discharge high-Qg MOSFETs like FDC2512 in flyback topologies. |
| Reference Voltage | 0.780–0.820V (grade-dependent); sets output via external resistive divider, enabling flexible VOUT design from 3.3V to >24V. |
Pinout & Package
Package: 6-lead low-profile (1mm height) TSOT-23 (S6), JEDEC MO-193 compliant, rated for θJA = 192°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (1) | Error amplifier output & shutdown control | Sinks/sources current to set current comparator threshold; pulled below 0.28V to force shutdown; internal 0.3μA pull-up. |
| GND (2) | Analog and power ground reference | Common return for VFB, SENSE, and internal regulators; must be low-impedance connection to minimize noise coupling. |
| VFB (3) | Feedback input | Compares divided output voltage against 0.8V internal reference; input bias current ≤50nA minimizes divider error. |
| SENSE (4) | Current sense & slope compensation injection | Monitors external RSENSE voltage; injects 5μA linear ramp for duty-cycle-dependent slope compensation. |
| VCC (5) | Supply input with integrated shunt regulator | Accepts 5–50V input; internal clamp regulates to ~8.1V; sinks up to 25mA to enable simple resistor-fed biasing. |
| NGATE (6) | N-channel MOSFET gate driver | Push-pull output swinging 0V to VCC; 40ns rise/fall into 3000pF; 1A peak current supports fast switching of medium-power FETs. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current mode | 200kHz operation maintained down to zero load, eliminating audible noise and simplifying EMI filtering vs. variable-frequency alternatives. |
| Extended temperature grade | –55°C to +150°C operating range (MP-grade) enables use in automotive engine control units and industrial motor drives without derating. |
| Ground-referenced current sensing | Allows direct placement of RSENSE on MOSFET source, avoiding high-side sensing complexity and enabling input voltages beyond IC absolute max ratings. |
| Internal soft-start | 0.7ms controlled ramp of ITH/RUN voltage prevents inrush current and transformer saturation during startup. |
| Programmable slope compensation | 5μA ramp injected at SENSE pin enables stable operation at >50% duty cycle in flyback/SEPIC without subharmonic oscillation. |
Applications
| Telecom Auxiliary Supply | Power over Ethernet (PoE) Housekeeping |
|---|---|
|
Use Scenario: Generating isolated 5V/12V bias rails for line cards and interface ICs in 48V telecom systems. IC Role / Device Role / Timing Role: Flyback controller regulating secondary-side output via optocoupler feedback; 200kHz timing sets transformer size and filter component values. Use Value: ±1.5% accuracy ensures reliable logic-level compliance; 240μA quiescent current extends standby efficiency in always-on network infrastructure. |
Use Scenario: Providing isolated 3.3V/5V power for PD-side monitoring, classification, and interface circuitry in IEEE 802.3af/at systems. IC Role / Device Role / Timing Role: Primary-side flyback controller with ground-referenced sensing; 200kHz frequency balances efficiency and transformer cost for <10W outputs. Use Value: –55°C to +150°C rating supports operation in uncontrolled outdoor enclosures; internal shunt regulator simplifies biasing from PoE-derived 44–57V input. |
| Automotive Body Control Module | Industrial Isolated Sensor Interface |
|
Use Scenario: Generating isolated 5V for CAN transceivers and microcontrollers in under-hood ECUs exposed to extreme thermal cycling. IC Role / Device Role / Timing Role: Constant-frequency flyback controller driving external N-MOSFET; UVLO thresholds ensure robust start-up after cold cranking (≥4.8V). Use Value: MP-grade qualification guarantees reliability at 150°C junction temperature; no minimum load requirement avoids instability during sleep modes. |
Use Scenario: Powering isolated analog front-ends and ADCs in high-voltage motor drives or grid-connected inverters requiring reinforced insulation. IC Role / Device Role / Timing Role: Primary-side controller enabling galvanic isolation via custom flyback transformer; SENSE pin slope compensation ensures stability with wide input/output ratios. Use Value: Adjustable slope compensation allows optimization for varying duty cycles across 18–72V input ranges; ±1.5% accuracy maintains sensor signal integrity. |
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 100–600kHz frequency; no internal shunt regulator; requires external bias supply. | Better suited for designs needing higher switching frequencies or tighter EMI control; not ideal for simple resistor-fed inputs. | Select when frequency tuning or lower EMI is prioritized over bias simplicity. |
| LTC3873ES6-5#TRPBF | No external current sense resistor required (No RSENSE™); 100–600kHz programmable; higher quiescent current (1.2mA). | Reduces BOM count and PCB area in cost-sensitive, medium-power flybacks; less suitable for ultra-low-quiescent applications. | Choose when minimizing external components outweighs 5× higher IQ and lack of MP-grade temp range. |
Compared with LTC3803MPS6-5#TRMPBF, LTC3805ES6-5#TRPBF offers frequency flexibility at the cost of added bias complexity, while LTC3873ES6-5#TRPBF eliminates RSENSE but sacrifices quiescent current and extended temperature capability-making LTC3803MPS6-5#TRMPBF optimal for rugged, low-IQ, fixed-frequency flyback designs.
Availability
LTC3803MPS6-5#TRMPBF is available at Aetrix Electronics and suitable for telecom auxiliary supplies, Power over Ethernet (PoE) housekeeping circuits, and automotive body control modules requiring stable component supply across extended temperature ranges.
Supply support for LTC3803MPS6-5#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 precision analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3803 family is designed for isolated flyback, SEPIC, and boost DC/DC converter applications where simplicity, low quiescent current, and extended temperature operation are critical in space-constrained, high-reliability systems.
FAQ
What is the operating temperature range of the LTC3803MPS6-5#TRMPBF?
The LTC3803MPS6-5#TRMPBF is an MP-grade part qualified for continuous operation from –55°C to +150°C junction temperature, making it suitable for under-hood automotive, industrial control, and outdoor telecom equipment where ambient extremes are encountered. This exceeds the –40°C to +125°C range of standard E/I-grade variants like LTC3803ES6-5#TRPBF.
How does the LTC3803MPS6-5#TRMPBF achieve low quiescent current?
The LTC3803MPS6-5#TRMPBF achieves 240μA typical quiescent current through optimized internal biasing, low-leakage CMOS design, and efficient gate drive architecture. This value is measured in normal operation with VITH/RUN = 1.3V and is critical for maintaining high efficiency in always-on auxiliary supplies-directly enabling longer battery backup or reduced thermal load in sealed enclosures.
Can the LTC3803MPS6-5#TRMPBF be powered directly from a high input voltage?
Yes-the LTC3803MPS6-5#TRMPBF integrates a VCC shunt regulator that clamps at ~8.1V and can sink up to 25mA. This allows direct powering from VIN (e.g., 24V–48V) through a single series resistor and local ceramic bypass capacitor (e.g., 10μF), eliminating the need for an external LDO or buck converter in many flyback implementations.
What is the purpose of the SENSE pin on the LTC3803MPS6-5#TRMPBF?
The SENSE pin on the LTC3803MPS6-5#TRMPBF serves two functions: (1) it monitors voltage across an external current-sense resistor to implement peak-current-mode control, and (2) it injects a 5μA linear ramp current used for programmable slope compensation-critical for stability in flyback converters operating above 50% duty cycle. An external resistor (RSL) converts this ramp into a compensating voltage.
Does the LTC3803MPS6-5#TRMPBF require an external optocoupler for regulation?
The LTC3803MPS6-5#TRMPBF does not require an optocoupler for basic regulation-it uses primary-side sensing via the SENSE pin and VFB feedback from the secondary. However, for tight output voltage accuracy (<±1%) across line/load/temperature, or in applications requiring reinforced isolation certification (e.g., IEC 62368), an optocoupler-based secondary-side feedback loop is recommended and commonly implemented in reference designs.
LTC3803MPS6-5#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):
- 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#TRMPBF FAQ
1.How can I place an order for LTC3803MPS6-5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3803MPS6-5#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 LTC3803MPS6-5#TRMPBF reliable?
The price and inventory of LTC3803MPS6-5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3803MPS6-5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3803MPS6-5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3803MPS6-5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3803MPS6-5#TRMPBF?
LTC3803MPS6-5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3803MPS6-5#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 LTC3803MPS6-5#TRMPBF?
For technical support, including LTC3803MPS6-5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3803MPS6-5#TRMPBF requirements.
6.How does Aetrix verify that LTC3803MPS6-5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3803MPS6-5#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 LTC3803MPS6-5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3803MPS6-5#TRMPBF?
All LTC3803MPS6-5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3803MPS6-5#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 LTC3803MPS6-5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3803MPS6-5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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