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Analog Devices Inc. LTC3809EDD-1#PBF
- Part No.:
- LTC3809EDD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3809EDD-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LTC3809EDD-1#PBF 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 features constant-frequency current-mode control at 550 kHz, 0.6 V ±1.5% reference, wide input range (2.75 V to 9.8 V), output tracking capability, and 100% duty cycle for low-dropout operation - ideal for battery-powered systems such as portable instruments and notebook computers.
For engineers reviewing the LTC3809EDD-1#PBF datasheet, LTC3809EDD-1#PBF pinout, LTC3809EDD-1#PBF application, or LTC3809EDD-1#PBF equivalent, key selection considerations include its No RSENSE™ architecture, selectable Burst Mode®/pulse-skipping/forced continuous operation, IPRG-configurable peak current sense threshold (70–223 mV), auxiliary winding regulation via MODE pin, and thermal performance in the 3 mm × 3 mm DFN package with exposed pad.
Technical Context
The LTC3809EDD-1#PBF implements a constant-frequency current-mode control loop using VDS sensing across the external P-channel MOSFET to eliminate the need for a discrete sense resistor. Its error amplifier compares VFB against a 0.6 V reference and drives the ITH pin to regulate peak inductor current, while slope compensation activates above 20% duty cycle per Figure 1.
It supports three light-load operating modes selected via the MODE pin: Burst Mode® (MODE = VIN), pulse-skipping (MODE = VFB), or forced continuous conduction (MODE = GND). Output voltage tracking is implemented through the TRACK/SS pin, enabling coincident or ratiometric startup with external supplies, and overvoltage protection triggers at 0.68 V on VFB (13.33% above 0.6 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 550 kHz - enables compact magnetics and predictable EMI profile. |
| Input Voltage Range | 2.75 V to 9.8 V - supports single/dual Li-ion, USB, and intermediate bus rails. |
| Output Voltage Range | 0.6 V to VIN - accommodates core logic, I/O, and analog supply domains. |
| Reference Voltage | 0.6 V ±1.5% - ensures tight output regulation accuracy across temperature. |
| Quiescent Current | 9 μA in shutdown - extends battery life in always-on portable systems. |
| Peak Current Sense Threshold | Configurable: 70 mV (IPRG = GND), 125 mV (IPRG = float), 204 mV (IPRG = VIN) - allows optimization of MOSFET RDS(ON) vs. noise immunity. |
| Soft-Start Time | 0.74 ms internal ramp - prevents inrush current and ensures controlled power-up. |
Pinout & Package
Package: 10-lead (3 mm × 3 mm) plastic DFN with exposed thermal pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (1) | Auxiliary feedback / mode select | Dual-function: enables secondary winding regulation or selects Burst Mode®/pulse-skipping/forced continuous operation. |
| TRACK/SS (2) | Tracking input / soft-start control | Enables output voltage to track an external rail during startup or programs external soft-start timing via capacitor. |
| VFB (3) | Feedback input | Compares divided output voltage against 0.6 V reference to close regulation loop. |
| ITH (4) | Error amplifier output / current threshold | Sets peak inductor current limit; nominal operating range 0.7 V to 2.0 V. |
| RUN (5) | Enable control | Pulling below 1.1 V disables controller; release enables internal 0.74 ms soft-start. |
| IPRG (6) | Current sense threshold select | Three-state pin setting max ΔVSENSE: GND = 70 mV, float = 125 mV, VIN = 204 mV. |
| BG (7) | Bottom gate driver output | Drives N-channel MOSFET gate from PGND to VIN; supports synchronous rectification. |
| TG (8) | Top gate driver output | Drives P-channel MOSFET gate from PGND to VIN; enables high-side switch control. |
| VIN (9) | Supply input | Powers internal circuitry and gate drivers; also positive input to differential current comparator. |
| SW (10) | Switch node | Connects to MOSFET drains and inductor; serves as negative input to current comparator and reverse-current detector. |
| GND (11, Exposed Pad) | Ground reference | Common return for internal circuits, gate drivers, and reverse-current comparator; must be soldered to PCB ground. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ architecture | Eliminates external current-sense resistor, reducing BOM cost, board space, and power loss in high-current paths. |
| Selectably optimized light-load efficiency | Burst Mode® (up to 90% efficiency at 1 mA), pulse-skipping (low ripple/no audio noise), or forced continuous (lowest output ripple). |
| Programmable output tracking | Supports precise sequencing of multiple rails via resistor-divided external voltage applied to TRACK/SS pin. |
| 100% duty cycle operation | Enables dropout operation down to VOUT – VDS(ON), extending runtime in battery-depleted conditions. |
| Integrated fault protection | Includes overvoltage protection (OVP at 0.68 V on VFB), short-circuit current limiting, and undervoltage lockout (UVLO at 2.25 V). |
Applications
| Portable Medical Instruments | Notebook & Tablet Power Rails |
|---|---|
|
Use Scenario: Powering ADCs, sensors, and microcontrollers in handheld ultrasound or glucose monitors with single-cell Li-ion input. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.8 V and 3.3 V rails from 3.0–4.2 V battery. Use Value: No RSENSE™ reduces heat generation in sealed enclosures; 100% duty cycle maintains output during battery sag to 3.0 V. |
Use Scenario: Generating core voltage (VCORE) and I/O voltage (VIO) in ultra-thin notebooks with tight thermal constraints. IC Role / Device Role / Timing Role: High-efficiency step-down controller driving discrete MOSFETs for dynamic CPU voltage scaling. Use Value: 550 kHz fixed frequency enables small 2.2 µH inductors; Burst Mode® achieves <15 µA system standby current. |
| Industrial Handheld Terminals | Distributed DC Power Systems |
|
Use Scenario: Power management in ruggedized barcode scanners and RFID readers operating from 2.75–9.8 V input sources. IC Role / Device Role / Timing Role: Main DC/DC controller supporting input voltage transients and cold-cranking conditions. Use Value: Wide VIN range and UVLO (2.25 V) ensure reliable startup even after deep discharge; MODE pin enables auxiliary winding regulation for isolated bias. |
Use Scenario: Intermediate bus converter in modular telecom or datacom systems requiring precise rail sequencing. IC Role / Device Role / Timing Role: Tracking-capable controller coordinating startup of FPGA, memory, and PHY supplies. Use Value: Coincident/ratiometric tracking via TRACK/SS eliminates need for external sequencers; ±1.5% reference ensures tight multi-rail tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3809EMSE-1#PBF | Same die, MSOP-10 package (θJA = 40°C/W vs. 43°C/W); no exposed thermal pad. | Lower thermal performance in high-power density layouts; suitable where DFN rework is constrained. | Select when board assembly process favors gull-wing leads or thermal requirements permit higher junction rise. |
| MP2307DN-LF-Z | Monolithic 2 A buck converter (integrated MOSFETs); fixed 500 kHz; no tracking or MODE-selectable light-load modes. | Lacks output tracking, auxiliary winding regulation, and programmable current sense threshold; limited to ≤2 A integrated solution. | Choose only for cost-sensitive, lower-current (<2 A), non-tracking applications where board space is critical and discrete FETs are undesirable. |
Compared with LTC3809EMSE-1#PBF, the LTC3809EDD-1#PBF offers superior thermal dissipation via exposed pad; compared with MP2307DN-LF-Z, it provides design flexibility with external FETs, precision tracking, and configurable light-load behavior - essential for high-reliability, multi-rail, or high-current systems.
Availability
LTC3809EDD-1#PBF is available at Aetrix Electronics and suitable for portable medical instruments, notebook power rails, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3809EDD-1#PBF 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 full product continuity, documentation, and technical support for all Linear ICs including the LTC3809 series.
The LTC3809 family was designed as high-efficiency, low-VIN synchronous buck controllers targeting battery-powered and intermediate-bus applications where No RSENSE™ operation, output tracking, and flexible light-load management are critical.
FAQ
What is the function of the IPRG pin on the LTC3809EDD-1#PBF?
The IPRG pin on the LTC3809EDD-1#PBF selects the maximum peak current sense voltage threshold across the external P-channel MOSFET: 70 mV when tied to GND, 125 mV when floating, and 204 mV when tied to VIN. This allows designers to optimize MOSFET RDS(ON) selection based on load current and noise immunity requirements - a key parameter directly affecting efficiency and stability in the LTC3809EDD-1#PBF's VDS-sense architecture.
Does the LTC3809EDD-1#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3809EDD-1#PBF supports both coincident and ratiometric output voltage tracking via the TRACK/SS pin. When an external voltage is applied through a resistor divider to this pin, the controller regulates VFB to match the TRACK/SS voltage during startup - enabling precise sequencing of multiple rails. The LTC3809EDD-1#PBF's internal soft-start ramp (0.74 ms) can also be overridden by this external signal, making it essential for FPGA or processor power sequencing applications.
What are the light-load operation modes supported by the LTC3809EDD-1#PBF, and how are they selected?
The LTC3809EDD-1#PBF supports three light-load modes: Burst Mode® (MODE = VIN), pulse-skipping (MODE = VFB), and forced continuous conduction (MODE = GND). These are selected by DC voltage level on the MODE pin and affect efficiency, output ripple, and audible noise. Burst Mode® maximizes light-load efficiency but introduces switching noise; forced continuous minimizes ripple but sacrifices efficiency below ~200 mA; pulse-skipping balances both. All modes are fully supported in the LTC3809EDD-1#PBF without external components.
What package type and thermal characteristics does the LTC3809EDD-1#PBF use?
The LTC3809EDD-1#PBF uses a 10-lead, 3 mm × 3 mm plastic DFN package with an exposed thermal pad (Pin 11 = GND). The exposed pad must be soldered to a PCB ground plane to achieve θJA = 43°C/W. This package enables high power density and superior thermal performance compared to MSOP variants, making it suitable for compact, thermally constrained designs where the LTC3809EDD-1#PBF delivers up to 10 A with appropriate external FETs and layout.
How does the LTC3809EDD-1#PBF implement overvoltage protection?
The LTC3809EDD-1#PBF implements overvoltage protection using an internal comparator that monitors the VFB pin. When VFB exceeds 0.68 V - corresponding to a 13.33% overvoltage relative to the 0.6 V reference - the top gate (TG) is disabled and bottom gate (BG) is enabled to clamp the output. This fast-acting OVP protects downstream loads during transient events or feedback loop faults, and is an integral safety feature of the LTC3809EDD-1#PBF's protection suite.
LTC3809EDD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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-DFN (3x3)
LTC3809EDD-1#PBF FAQ
1.How can I place an order for LTC3809EDD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3809EDD-1#PBF 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 LTC3809EDD-1#PBF reliable?
The price and inventory of LTC3809EDD-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3809EDD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3809EDD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3809EDD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3809EDD-1#PBF?
LTC3809EDD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3809EDD-1#PBF 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 LTC3809EDD-1#PBF?
For technical support, including LTC3809EDD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3809EDD-1#PBF requirements.
6.How does Aetrix verify that LTC3809EDD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3809EDD-1#PBF 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 LTC3809EDD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3809EDD-1#PBF?
All LTC3809EDD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3809EDD-1#PBF, 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 LTC3809EDD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3809EDD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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