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Analog Devices Inc. LTC3803HS6-5#TRPBF
- Part No.:
- LTC3803HS6-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3803HS6-5#TRPBF.pdf
- Description:
- IC REG CTRLR FLYBACK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
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Product details
Overview
LTC3803HS6-5#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 fixed switching frequency down to light loads, and features internal soft-start, adjustable slope compensation, and 240μA quiescent current. It is used in telecom auxiliary supplies and PoE-powered housekeeping rails.
For engineers reviewing the LTC3803HS6-5#TRPBF datasheet, LTC3803HS6-5#TRPBF pinout, LTC3803HS6-5#TRPBF application, or LTC3803HS6-5#TRPBF equivalent, key selection criteria include its –40°C to 150°C operating junction temperature rating, ground-referenced current sensing enabling VIN beyond VCC limits, programmable UVLO threshold (4.8V turn-on), and SOT-23-6 ThinSOT™ package compatibility with space-constrained isolated converters.
Technical Context
The LTC3803HS6-5#TRPBF implements peak current-mode control with a 200kHz free-running oscillator, internal 800mV reference, and error amplifier transconductance of 200–500μA/V. Its ITH/RUN pin serves dual roles: compensation node and run/shutdown control, with shutdown triggered below 0.08–0.47V depending on grade.
It integrates an internal shunt regulator clamping VCC to ~8.1V (at 1mA–25mA), supports external slope compensation via SENSE-pin 5μA ramp, and enforces duty cycle limits of 6.5% minimum and 70–90% maximum. The NGATE driver delivers 1A peak sink/source into 3000pF load with 40ns rise/fall times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 200kHz fixed (170–230kHz over temp); enables predictable EMI filtering and compact magnetics design. |
| Output Voltage Accuracy | ±1.5% over –40°C to 150°C; ensures stable regulation across automotive and industrial thermal extremes. |
| Quiescent Current | 240μA typical; minimizes no-load power loss in always-on auxiliary supplies. |
| VCC UVLO Threshold | 4.8V turn-on / 4.0V turn-off (typical); prevents unreliable gate drive during brownout conditions. |
| Peak Sense Voltage | 100mV (typical); sets current limit with low-loss, high-precision external sense resistor. |
| Junction Temp Range | –40°C to 150°C; qualified for under-hood automotive and high-ambient industrial environments. |
| Gate Drive Rise/Fall | 40ns (CL = 3000pF); supports fast-switching MOSFETs without excessive switching loss. |
Pinout & Package
Package: 6-lead Low Profile (1mm) TSOT-23 (ThinSOT™), JEDEC MO-193 compliant, lead-free finish, tape-and-reel packaged.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (1) | Error amplifier output & shutdown control | Sets current comparator threshold; pulled up by 0.3μA source; <0.28V forces shutdown. |
| GND (2) | Analog and power ground reference | Common return for feedback, sense, and VCC bypass; must be low-impedance. |
| VFB (3) | Feedback input | Compares output divider voltage to 800mV internal reference; 10nA input bias enables high-R dividers. |
| SENSE (4) | Current sense & slope compensation injection | Monitors RSENSE voltage; sources 5μA linear ramp for duty-cycle-dependent compensation. |
| VCC (5) | Supply input with internal shunt regulator | Internally clamped to ~8.1V; accepts 5–50V input via series resistor; requires local 10μF ceramic bypass. |
| NGATE (6) | N-channel MOSFET gate driver | 0V to VCC swing; 1A peak drive; 40ns edges; drives external switch in primary-side flyback topology. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency operation | Maintains 200kHz switching from full load to light load, reducing low-frequency noise in sensitive analog systems. |
| Ground-referenced current sensing | Enables direct sensing on MOSFET source without high-side bias, simplifying layout and supporting VIN > VCC designs. |
| Internal soft-start | 0.7ms controlled ITH/RUN ramp-up prevents inrush current and output overshoot at startup. |
| Adjustable slope compensation | 5μA programmable ramp injected at SENSE pin stabilizes current loop above 50% duty cycle without external op-amp. |
| Wide input voltage range | Operates from 5V min; VCC shunt regulator allows direct connection to 6–75V inputs via single resistor. |
Applications
| Telecom Auxiliary Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Providing isolated 5V/3.3V bias for DSPs, PHYs, and monitoring ICs in 48V telecom shelves. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output using optocoupler feedback. Use Value: ±1.5% accuracy and 240μA IQ ensure stable logic supply across -40°C to 85°C ambient with minimal standby loss. |
Use Scenario: Generating 5V housekeeping rail for microcontrollers and CAN transceivers in engine bay ECUs. IC Role / Device Role / Timing Role: High-temp-rated flyback controller driving external MOSFET to withstand 150°C junction temperature. Use Value: –40°C to 150°C guaranteed operation and 4.8V UVLO prevent malfunction during cold cranking or thermal soak. |
| Power over Ethernet (PoE) | Industrial Isolated Sensor Interface |
Use Scenario: Deriving 3.3V/5V from PoE midspan (57V) for powered devices like IP cameras and VoIP phones. IC Role / Device Role / Timing Role: Constant-frequency flyback controller with internal slope compensation for stable operation at variable duty cycles. Use Value: 200kHz fixed frequency simplifies EMI compliance; ground-referenced sensing avoids level-shifting complexity. |
Use Scenario: Powering isolated analog front-ends and ADCs in 24V industrial PLC I/O modules. IC Role / Device Role / Timing Role: Compact flyback controller in ThinSOT-6 enabling dense PCB layouts with reinforced isolation barriers. Use Value: 1mm profile and 6-lead SOT-23 reduce board area; 240μA IQ extends battery backup runtime in fail-safe modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3805-5#TRPBF | Adjustable frequency (100kHz–1MHz), DFN-10 package, no internal shunt regulator. | Requires external bias supply; better for designs needing higher frequency or tighter layout control. | Choose when frequency tuning or lower profile (0.75mm) is prioritized over simplicity of single-resistor VCC feed. |
| LTC3873-5#TRPBF | No RSENSE architecture, senses MOSFET VDS; 8-lead ThinSOT, same temp grade. | Eliminates sense resistor loss but requires careful layout for noise immunity on high-side sensing. | Prefer when efficiency at medium-to-high load is critical and layout can accommodate VDS sensing. |
Compared with LTC3803HS6-5#TRPBF, LTC3805-5#TRPBF offers frequency flexibility at the cost of added external components, while LTC3873-5#TRPBF improves conduction efficiency by removing the sense resistor but increases sensitivity to switching noise - making LTC3803HS6-5#TRPBF optimal for cost-sensitive, thermally demanding, fixed-frequency isolated supplies.
Availability
LTC3803HS6-5#TRPBF is available at Aetrix Electronics and suitable for telecom auxiliary supplies, automotive body control modules, and Power over Ethernet (PoE) powered devices requiring stable component supply across extended temperature ranges.
Supply support for LTC3803HS6-5#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3803 family is designed for isolated flyback, SEPIC, and boost converter topologies where simplicity, wide input range, and high-temperature reliability are critical - especially in space-constrained auxiliary power rails.
FAQ
What is the maximum allowable input voltage for the LTC3803HS6-5#TRPBF VCC pin?
The LTC3803HS6-5#TRPBF VCC pin has an absolute maximum rating of 25mA into VCC, not a voltage limit. Its internal shunt regulator clamps VCC to ~8.1V across 1–25mA, allowing safe operation with input voltages up to 75V via a series resistor - as confirmed in the Typical Applications section and Absolute Maximum Ratings table. The LTC3803HS6-5#TRPBF itself does not impose a VIN upper bound; external components define it.
Does the LTC3803HS6-5#TRPBF support synchronous rectification?
No, the LTC3803HS6-5#TRPBF does not support synchronous rectification. It is a primary-side controller with NGATE output only - intended to drive an N-channel MOSFET on the primary side of a flyback transformer. Secondary-side synchronous rectification requires a separate gate driver or dedicated secondary-side controller, which the LTC3803HS6-5#TRPBF does not provide or monitor.
How is the undervoltage lockout threshold set on the LTC3803HS6-5#TRPBF?
The LTC3803HS6-5#TRPBF features a fixed internal UVLO with a nominal 4.8V turn-on and 4.0V turn-off threshold, as specified in the Electrical Characteristics table. This threshold is not user-adjustable - it is implemented via internal bandgap circuitry and applies directly to the VCC pin voltage. No external components are required to configure UVLO behavior for the LTC3803HS6-5#TRPBF.
Can the LTC3803HS6-5#TRPBF be used in boost converter configurations?
Yes, the LTC3803HS6-5#TRPBF is explicitly rated for boost, SEPIC, and flyback topologies per the Operation section and Related Parts table. Its current-mode architecture, ground-referenced sense, and 200kHz oscillator make it suitable for non-isolated boost designs - though external component selection (inductor, diode, feedback network) must comply with boost-specific stability and voltage stress requirements.
What is the purpose of the SENSE pin on the LTC3803HS6-5#TRPBF besides current sensing?
Beyond monitoring voltage across the external current sense resistor, the SENSE pin on the LTC3803HS6-5#TRPBF injects a programmable 5μA linear ramp current used for slope compensation. This ramp develops a duty-cycle-proportional voltage drop across an external resistor (RSL) to stabilize the current loop against subharmonic oscillation - a critical function in flyback converters operating above 50% duty cycle.
LTC3803HS6-5#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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3803HS6-5#TRPBF FAQ
1.How can I place an order for LTC3803HS6-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3803HS6-5#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 LTC3803HS6-5#TRPBF reliable?
The price and inventory of LTC3803HS6-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3803HS6-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3803HS6-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3803HS6-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3803HS6-5#TRPBF?
LTC3803HS6-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3803HS6-5#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 LTC3803HS6-5#TRPBF?
For technical support, including LTC3803HS6-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3803HS6-5#TRPBF requirements.
6.How does Aetrix verify that LTC3803HS6-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3803HS6-5#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 LTC3803HS6-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3803HS6-5#TRPBF?
All LTC3803HS6-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3803HS6-5#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 LTC3803HS6-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3803HS6-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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