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Analog Devices Inc. LTC3805MPMSE-5#TRPBF
- Part No.:
- LTC3805MPMSE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3805MPMSE-5#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,724
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Product details
Overview
LTC3805MPMSE-5#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode DC/DC controller IC designed to drive external N-channel MOSFETs in flyback, boost, and SEPIC topologies. It delivers ±1.5% output voltage accuracy, supports 70kHz–700kHz adjustable switching frequency via one resistor, features programmable overcurrent protection with automatic restart, and operates across –55°C to 150°C junction temperature. It is used in isolated auxiliary power supplies for telecom and automotive systems.
For engineers reviewing the LTC3805MPMSE-5#TRPBF datasheet, LTC3805MPMSE-5#TRPBF pinout, LTC3805MPMSE-5#TRPBF application, or LTC3805MPMSE-5#TRPBF equivalent, key selection criteria include its micropower startup (40µA), 100mV current sense threshold, precision RUN pin hysteresis, 9.5V internal VCC shunt regulator, and MSOP-10 package compatibility with high-reliability industrial and aerospace designs.
Technical Context
The LTC3805MPMSE-5#TRPBF implements peak current-mode control using an internal error amplifier (333µA/V transconductance), programmable slope compensation (10µA ramp), and dual-threshold RUN pin logic (1.122V–1.292V turn-on, 4µA–5.8µA hysteresis current). Its oscillator uses a single external resistor (RFS) to set frequency from 70kHz to 700kHz and supports synchronization via the SYNC pin.
It integrates fault management with SSFLT pin-based soft-start (programmable via capacitor) and fault timeout (4.5ms internal, extendable externally), while the OC pin enables adjustable overcurrent trip (85–115mV) independent of ISENSE sensing. The ITH pin serves as both loop compensation node and current comparator threshold input, clamped between 0.7V and 1.9V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFB Accuracy | ±1.5% over –55°C to 150°C; enables precise output regulation without trimming. |
| Quiescent Current | 360µA normal operation / 40µA micropower startup; minimizes standby loss in always-on systems. |
| Switching Frequency | 70kHz–700kHz via RFS; allows optimization of size vs. efficiency in high-density converters. |
| VCC Shunt Regulator | 9.5V clamp (8.8–9.9V range); permits direct bias from VIN up to 100V+ via series resistor. |
| Current Sense Threshold | 100mV typical at ISENSE; reduces power loss in sense resistor and improves light-load efficiency. |
| Operating Temp Range | –55°C to 150°C junction; qualified for extended-temperature automotive, avionics, and downhole applications. |
| UVLO Thresholds | VTURNON = 4.5V, VTURNOFF = 3.95V; ensures robust start-up and brownout recovery in noisy supply rails. |
Pinout & Package
Package: 10-lead plastic MSOP with exposed pad (Pin 11 = GND). Thermal resistance θJA = 45°C/W. Exposed pad must be soldered to PCB ground for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SSFLT (1) | Soft-Start & Fault Timeout | Capacitor-to-GND sets soft-start ramp time and post-fault retry delay; internal 6µA charge / 2µA discharge. |
| ITH (2) | Error Amplifier Output | Compensation node; voltage (0.7–1.9V) sets current comparator threshold and loop stability. |
| FB (3) | Feedback Input | Monitors output divider; regulates VOUT to 0.8V reference with ±1.5% accuracy across full temp range. |
| RUN (4) | Enable Control | Precision threshold (1.207V ON / 1.170V OFF) with 5µA hysteresis current for clean VIN sequencing. |
| FS (5) | Frequency Set | Resistor-to-GND programs fOSC = 24×10⁹/(RFS−1500); enables wide frequency tuning with one component. |
| SYNC (6) | External Clock Input | Accepts 70–700kHz external clock; rising edge triggers GATE high, enabling EMI reduction via synchronization. |
| ISENSE (7) | Current Sensing & Slope Comp | Senses MOSFET current; injects 10µA linear ramp for slope compensation in duty cycles >6%. |
| OC (8) | Overcurrent Detection | Separate trip input (85–115mV threshold); enables independent overload protection beyond ITH-limited current. |
| VCC (9) | Supply Input | Internally clamped to 9.5V; accepts 4.7–8.8V low-impedance or high-VIN via resistor (≤25mA sink). |
| GATE (10) | MOSFET Driver Output | Push-pull driver (GND to VCC); 30ns rise/fall into 3000pF; drives N-channel MOSFET gate directly. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Soft-Start | Single external capacitor on SSFLT controls both startup ramp and fault retry timing-no extra circuitry needed. |
| Adjustable Slope Compensation | 10µA internal ramp injected at ISENSE enables stable current-mode control in high-duty-cycle boost/SEPIC designs. |
| Independent Overcurrent Protection | OC pin provides dedicated, resistor-adjustable trip level (85–115mV), decoupled from main current sensing path. |
| Micropower Startup Mode | 40µA quiescent current during initial power-up extends hold-up time in capacitor-fed bias networks. |
| Wide-Temperature Qualified | Tested and guaranteed over –55°C to 150°C; meets MIL-PRF-38535 Class K screening requirements for high-reliability use. |
Applications
| Automotive Auxiliary Power | Telecom Housekeeping Supply |
|---|---|
Use Scenario: Generating isolated 5V/3.3V bias rails for infotainment ECUs and ADAS sensors from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Flyback controller managing primary-side regulation, synchronous rectification timing, and load-step response. Use Value: ±1.5% VFB accuracy and –55°C to 150°C operation ensure stable MCU core voltage under extreme under-hood thermal cycling. | Use Scenario: Providing 12V/1A auxiliary power for optical line cards and remote PHY modules in central office equipment. IC Role / Device Role / Timing Role: Boost controller delivering regulated output from –48V telecom bus with EMI-controlled switching. Use Value: SYNC pin enables synchronization to system clock, reducing conducted emissions in dense backplane environments. |
| Isolated Industrial Sensors | Power over Ethernet (PoE) PD Bias |
Use Scenario: Generating galvanically isolated 3.3V for analog front-ends in hazardous-area pressure/temperature transmitters. IC Role / Device Role / Timing Role: SEPIC controller enabling VIN > VOUT or VIN < VOUT operation without polarity reversal, supporting 24V–48V field bus inputs. Use Value: Adjustable UVLO (via RUN pin) and 4.5V VTURNON prevent false starts during brownout conditions common in factory wiring. | Use Scenario: Deriving 3.3V/500mA bias for PoE-powered devices (e.g., IP cameras, VoIP phones) from 44–57V PSE input. IC Role / Device Role / Timing Role: Flyback controller implementing secondary-side regulation with fast transient response for dynamic load profiles. Use Value: 100mV current sense threshold minimizes I²R loss in sense resistor, improving efficiency at partial load-critical for Class 3/4 PoE compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-mode flyback/boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3873EMS8-5#TRPBF | 8-lead MSOP; fixed 500kHz frequency; no SYNC or slope compensation; 50µA startup current. | Lacks programmable frequency and slope compensation-suitable only for fixed-frequency, low-complexity boost designs. | Select when board space is constrained and design does not require frequency tuning or high-duty-cycle stability. |
| LM5122MMX/NOPB | 16-pin WSON; supports up to 75V VIN; includes integrated gate driver bootstrap diode; 2.1mA quiescent current. | Higher IQ and larger package; targets higher-input-voltage industrial supplies-not drop-in for low-IQ, wide-temp designs. | Choose for 48V+ input systems where VCC bias complexity outweighs micropower advantage of LTC3805MPMSE-5#TRPBF. |
Compared with LTC3873EMS8-5#TRPBF and LM5122MMX/NOPB, the LTC3805MPMSE-5#TRPBF uniquely combines extended temperature qualification (–55°C to 150°C), micropower startup (40µA), and full programmability (frequency, slope, OC threshold) in a compact MSOP-10, making it optimal for high-reliability isolated converters where thermal margin and design flexibility are critical.
Availability
LTC3805MPMSE-5#TRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, telecom housekeeping supplies, and isolated industrial sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3805MPMSE-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 analog and power management portfolio. Linear's legacy emphasizes precision, reliability, and ruggedized operation in demanding environments.
The LTC3805MPMSE-5#TRPBF belongs to Linear's current-mode DC/DC controller family, engineered specifically for flyback, boost, and SEPIC converters in automotive, aerospace, and industrial systems where extended temperature range, low IQ, and programmable protection are mandatory.
FAQ
What is the operating temperature range of the LTC3805MPMSE-5#TRPBF?
The LTC3805MPMSE-5#TRPBF is tested and guaranteed over a junction temperature range of –55°C to 150°C. This MP-grade qualification exceeds standard industrial and automotive specifications, enabling use in engine compartments, avionics bays, and downhole tools where thermal extremes are routine. The device's electrical characteristics-including VFB accuracy and UVLO thresholds-are specified across this full range.
How does the RUN pin hysteresis work on the LTC3805MPMSE-5#TRPBF?
The RUN pin on the LTC3805MPMSE-5#TRPBF has built-in voltage hysteresis: it turns on at 1.207V and off at 1.170V. Additionally, a 5µA current source activates when enabled, allowing external resistor divider design to add user-programmable hysteresis. This prevents oscillation during slow-rising input voltages and ensures clean enable/disable sequencing in noisy automotive or industrial power rails.
Can the LTC3805MPMSE-5#TRPBF be synchronized to an external clock?
Yes, the LTC3805MPMSE-5#TRPBF supports external synchronization via the SYNC pin. A rising edge on SYNC forces the GATE pin high, initiating a new switching cycle. It accepts external clocks from 70kHz to 700kHz-matching its internal oscillator range-enabling EMI reduction in systems with multiple switching regulators or strict spectral emission requirements.
What is the purpose of the SSFLT pin on the LTC3805MPMSE-5#TRPBF?
The SSFLT pin on the LTC3805MPMSE-5#TRPBF serves dual functions: soft-start timing and fault timeout. An external capacitor charges at 6µA during startup to control output voltage ramp rate; after an overcurrent fault, the same capacitor discharges at 2µA to enforce a retry delay before automatic restart. This eliminates need for separate timing components in robust, self-recovering power designs.
Does the LTC3805MPMSE-5#TRPBF require an external current sense resistor?
Yes, the LTC3805MPMSE-5#TRPBF requires an external current sense resistor connected to the ISENSE pin for peak current-mode control. It senses switch current via voltage drop across this resistor, with a typical threshold of 100mV. A second resistor may be added to the OC pin for independent overcurrent protection-both resistors are essential for proper current limiting and fault handling in the LTC3805MPMSE-5#TRPBF.
LTC3805MPMSE-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.95V ~ 9.5V
- Frequency - Switching:
- 70kHz ~ 700kHz
- Duty Cycle (Max):
- 80%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3805MPMSE-5#TRPBF FAQ
1.How can I place an order for LTC3805MPMSE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3805MPMSE-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 LTC3805MPMSE-5#TRPBF reliable?
The price and inventory of LTC3805MPMSE-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 LTC3805MPMSE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3805MPMSE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3805MPMSE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3805MPMSE-5#TRPBF?
LTC3805MPMSE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3805MPMSE-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 LTC3805MPMSE-5#TRPBF?
For technical support, including LTC3805MPMSE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3805MPMSE-5#TRPBF requirements.
6.How does Aetrix verify that LTC3805MPMSE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3805MPMSE-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 LTC3805MPMSE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3805MPMSE-5#TRPBF?
All LTC3805MPMSE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3805MPMSE-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 LTC3805MPMSE-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3805MPMSE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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