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Analog Devices Inc. LTC3809IMSE-1#TRPBF
- Part No.:
- LTC3809IMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3809IMSE-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,968
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Product details
Overview
LTC3809IMSE-1#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller IC that drives external complementary P-channel and N-channel MOSFETs without requiring a current sense resistor. It operates with 2.75V–9.8V input, delivers 0.6V–VIN output, features 550kHz fixed-frequency current-mode control, 0.6V ±1.5% reference, and supports output voltage tracking for multi-rail power sequencing in portable computing systems.
For engineers reviewing the LTC3809IMSE-1#TRPBF datasheet, LTC3809IMSE-1#TRPBF pinout, LTC3809IMSE-1#TRPBF application, or LTC3809IMSE-1#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated MSOP-10 pin functions, confirmed alternative controllers for low-input-voltage synchronous buck designs, and supply-chain support details specific to industrial and embedded OEM use.
Technical Context
The LTC3809IMSE-1#TRPBF implements constant-frequency current-mode control using VDS sensing across the external P-channel high-side MOSFET, eliminating RSENSE and reducing conduction loss. Its error amplifier regulates VFB against a 0.6V reference, while the ITH pin sets peak current threshold via programmable ΔVSENSE(MAX) (85mV/125mV/204mV) selected by IPRG pin state.
It supports three light-load operating modes-Burst Mode® (MODE = VIN), pulse-skipping (MODE = VFB), and forced continuous (MODE = GND)-with 100% duty cycle capability for low-dropout operation. Fault protection includes overvoltage detection at VFB (0.68V threshold), short-circuit current limiting via bottom MOSFET VDS sensing, and undervoltage lockout (2.25V rising threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single/dual Li-ion battery inputs and wide industrial rails without external LDO pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct low-voltage core supply generation (e.g., 1.2V, 1.8V, 2.5V) with no minimum VOUT limitation. |
| Reference Voltage | 0.6V ±1.5% - ensures tight output regulation accuracy across –40°C to 85°C, critical for CPU/GPU core rail stability. |
| Switching Frequency | 550kHz (±7%) - balances inductor size, efficiency, and EMI; fixed frequency avoids subharmonic oscillation in current mode. |
| Peak Current Sense Threshold | 85mV / 125mV / 204mV - selectable via IPRG pin to match RDS(ON) of diverse P-MOSFETs while maintaining accurate current limiting. |
| Quiescent Current | 9μA in shutdown - minimizes battery drain during system sleep states in portable devices. |
| Soft-Start Time | 0.74ms internal - prevents inrush current and output overshoot during power-up; externally adjustable via TRACK/SS capacitor. |
Pinout & Package
Package: 10-lead plastic MSOP (3mm × 3mm), exposed pad (Pin 11) soldered to PCB ground for thermal and electrical performance. θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (1) | Auxiliary feedback / mode select | Selects Burst Mode® (VIN), pulse-skipping (VFB), or forced continuous (GND); also accepts auxiliary winding feedback for secondary regulation. |
| TRACK/SS (2) | Tracking or soft-start input | Enables coincident/ratiometric output voltage tracking during startup; external capacitor sets soft-start duration. |
| VFB (3) | Feedback input | Compares divided output voltage to 0.6V reference; high-impedance (≤50nA) input minimizes divider loading error. |
| ITH (4) | Error amp output / current threshold | Sets peak inductor current limit; nominal 0.7V–2V range allows precise load transient response tuning. |
| RUN (5) | Enable control | Pull below 1.1V to shut down; releases internal 0.7μA current source to enable soft-start when released. |
| IPRG (6) | Current sense threshold select | Three-state pin (float/GND/VIN) selects 125mV/85mV/204mV max VDS sense voltage for P-MOSFET current limiting. |
| BG (7) | Bottom gate driver | Drives N-channel MOSFET gate from PGND to VIN; fast rise/fall times (<50ns) reduce switching losses. |
| TG (8) | Top gate driver | Drives P-channel MOSFET gate from PGND to VIN; complements BG for synchronous rectification. |
| VIN (9) | Power supply input | Powers internal circuitry and gate drivers; also serves as positive input to differential current comparator. |
| SW (10) | Switch node | Connects to P-MOSFET drain, N-MOSFET drain, and inductor; negative input to current comparator and reverse-current detector. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE architecture | Eliminates power loss and board space associated with discrete current sense resistors; improves full-load efficiency by ~1–2%. |
| Programmable light-load mode | Three distinct modes (Burst/Pulse-Skipping/Forced Continuous) let designers optimize efficiency vs. noise vs. ripple trade-offs per application. |
| Output voltage tracking | Supports precise ratiometric or coincident startup sequencing of multiple rails (e.g., core + I/O) to prevent latch-up in FPGAs and processors. |
| 100% duty cycle operation | Extends usable battery life by maintaining regulation down to VIN ≈ VOUT, critical for single-cell Li-ion systems under discharge. |
| Integrated overvoltage protection | Shuts off top MOSFET and turns on bottom MOSFET if VFB exceeds 0.68V, preventing damage to downstream loads during transients. |
Applications
| Portable Computing Power | Multi-Rail FPGA Sequencing |
|---|---|
Use Scenario: Power management in ultraportable notebooks and 2-in-1 tablets with dual Li-ion batteries and multiple voltage domains. IC Role / Device Role / Timing Role: Primary synchronous buck controller generating core (1.2V), memory (1.8V), and I/O (3.3V) rails with coordinated startup timing. Use Value: Enables compact, high-efficiency power delivery with no sense resistor loss and precise voltage tracking to meet Intel IMVP or AMD SVI2 sequencing requirements. |
Use Scenario: Sequenced power-up of FPGA banks (e.g., core, transceiver, I/O) where voltage ramp order and slope must be strictly controlled. IC Role / Device Role / Timing Role: Tracking controller ensuring VCORE ramps before VI/O with matched slew rates using external resistor dividers on TRACK/SS and VFB. Use Value: Prevents configuration errors and latch-up by enforcing IEEE 1149.1-compliant power sequencing without external timers or supervisors. |
| Battery-Powered Instrumentation | Distributed DC Power Systems |
Use Scenario: Portable test equipment (e.g., handheld oscilloscopes, multimeters) requiring long runtime from 2-cell Li-ion packs. IC Role / Device Role / Timing Role: Main DC/DC controller delivering regulated 3.3V and 5V rails with ultra-low quiescent current and dropout headroom. Use Value: 9μA shutdown current and 100% duty cycle extend battery life >20% versus conventional controllers; Burst Mode maintains >85% efficiency at 1mA load. |
Use Scenario: Intermediate bus converters in telecom or industrial systems distributing 5V/12V from 24V/48V backplanes. IC Role / Device Role / Timing Role: High-efficiency point-of-load controller converting intermediate bus to processor or ASIC supply rails. Use Value: Fixed 550kHz frequency simplifies EMI filtering; VDS-based current sensing eliminates calibration drift over temperature and time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610IMSE#TRPBF | 42V input, 2.5A integrated power stage, 2MHz switching, requires external compensation. | Higher input voltage range and integrated MOSFETs simplify layout but increase cost and thermal constraints. | Choose LT8610IMSE#TRPBF for higher VIN (>12V) or space-constrained designs needing monolithic integration. |
| TPS54202DRCT | 2.95–17V input, 2A integrated FETs, 500kHz, no tracking or VDS sensing; uses current-sense resistor. | Lacks output tracking and resistorless current sensing; lower VIN min (2.95V) limits single-cell Li-ion compatibility. | Choose TPS54202DRCT for cost-sensitive, non-tracking applications with VIN ≥3V and acceptable RSENSE loss. |
Compared with LT8610IMSE#TRPBF and TPS54202DRCT, the LTC3809IMSE-1#TRPBF uniquely combines ultra-low 2.75V input capability, resistorless current sensing, and precise output tracking in a compact MSOP package-making it optimal for battery-powered multi-rail systems where efficiency, sequencing, and VIN headroom are critical.
Availability
LTC3809IMSE-1#TRPBF is available at Aetrix Electronics and suitable for portable computing power supplies, FPGA sequencing circuits, battery-powered instrumentation, distributed DC power systems, and industrial embedded controllers requiring stable component supply across extended temperature ranges.
Supply support for LTC3809IMSE-1#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 precision analog and power management product lines with full datasheet, simulation model, and application support.
The LTC3809 series is designed specifically for low-input-voltage synchronous buck conversion in portable and battery-operated systems, emphasizing efficiency at light loads, output tracking, and minimal external component count.
FAQ
What is the operating temperature range for the LTC3809IMSE-1#TRPBF?
The LTC3809IMSE-1#TRPBF is rated for operation from –40°C to +85°C and is guaranteed to meet all specifications across this full industrial temperature range. The "I" grade designation confirms this extended qualification, unlike the "E" grade which is only specified from 0°C to 85°C.
Does the LTC3809IMSE-1#TRPBF require an external current sense resistor?
No, the LTC3809IMSE-1#TRPBF does not require an external current sense resistor. It uses MOSFET VDS sensing between VIN and SW pins to detect peak inductor current, eliminating RSENSE power loss and improving overall efficiency-especially at high currents.
How is output voltage tracking implemented on the LTC3809IMSE-1#TRPBF?
Output voltage tracking on the LTC3809IMSE-1#TRPBF is implemented via the TRACK/SS pin. When an external voltage (e.g., from another regulator's output) is applied through a resistor divider to TRACK/SS, the controller regulates VFB to match that voltage during startup-enabling precise coincident or ratiometric ramping of multiple rails.
What are the three light-load operating modes of the LTC3809IMSE-1#TRPBF and how are they selected?
The LTC3809IMSE-1#TRPBF supports Burst Mode® (MODE = VIN), pulse-skipping (MODE = VFB), and forced continuous conduction (MODE = GND). These modes are selected by DC voltage level on the MODE pin and allow trade-offs among light-load efficiency, output ripple, and audible noise-critical for portable device battery life and EMI compliance.
Can the LTC3809IMSE-1#TRPBF operate with 100% duty cycle, and what is its significance?
Yes, the LTC3809IMSE-1#TRPBF supports 100% duty cycle operation, allowing the top P-channel MOSFET to remain continuously on when input voltage approaches output voltage. This extends usable battery life in single/dual-cell Li-ion systems by maintaining regulation down to VIN – VOUT ≈ RDS(ON) × ILOAD.
LTC3809IMSE-1#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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.75V ~ 9.8V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3809IMSE-1#TRPBF FAQ
1.How can I place an order for LTC3809IMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3809IMSE-1#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 LTC3809IMSE-1#TRPBF reliable?
The price and inventory of LTC3809IMSE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3809IMSE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3809IMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3809IMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3809IMSE-1#TRPBF?
LTC3809IMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3809IMSE-1#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 LTC3809IMSE-1#TRPBF?
For technical support, including LTC3809IMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3809IMSE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3809IMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3809IMSE-1#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 LTC3809IMSE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3809IMSE-1#TRPBF?
All LTC3809IMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3809IMSE-1#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 LTC3809IMSE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3809IMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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