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Analog Devices Inc. LTC3809EDD-1#TRPBF
- Part No.:
- LTC3809EDD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3809EDD-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,842
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Product details
Overview
LTC3809EDD-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 a fixed 550kHz switching frequency, supports output voltage tracking (coincident or ratiometric), delivers 0.6V ±1.5% reference accuracy, and enables low-dropout operation via 100% duty cycle - ideal for battery-powered systems such as portable instruments and notebook computers.
For engineers reviewing the LTC3809EDD-1#TRPBF datasheet, LTC3809EDD-1#TRPBF pinout, LTC3809EDD-1#TRPBF application, or LTC3809EDD-1#TRPBF equivalent, key selection considerations include its No RSENSE™ architecture, selectable Burst Mode®/pulse-skipping/forced continuous operation, IPRG-configurable peak current threshold (70–223mV), auxiliary winding regulation capability, and thermal performance in the 3mm × 3mm DFN package with exposed pad.
Technical Context
The LTC3809EDD-1#TRPBF implements a constant-frequency current mode control architecture using VDS sensing across the external P-channel MOSFET to eliminate the need for a sense resistor. Its differential current comparator monitors the voltage between VIN and SW pins, with peak current threshold dynamically adjusted by the IPRG pin state and duty-cycle-dependent slope compensation above 20%.
It integrates internal soft-start (0.74ms ramp), undervoltage lockout (2.25V rising threshold), overvoltage protection (0.68V at VFB), and three operating modes selected via the MODE pin: Burst Mode® (MODE = VIN), pulse-skipping (MODE = VFB), or forced continuous (MODE = GND). The TRACK/SS pin enables either external soft-start or precise output voltage tracking during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 550kHz - ensures predictable EMI profile and simplifies filter design. |
| Reference Voltage | 0.6V ±1.5% - sets accurate output regulation across temperature and load. |
| Input Voltage Range | 2.75V to 9.8V - supports single/dual Li-ion, USB, and intermediate bus rails. |
| Output Voltage Range | 0.6V to VIN - enables wide-range adjustable outputs including sub-1V core supplies. |
| Max Peak Current Sense | 70–223mV (IPRG-selectable) - determines maximum inductor current without external resistor. |
| Quiescent Current | 9μA in shutdown - minimizes battery drain in always-on portable systems. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and portable equipment environments. |
| Package Thermal Resistance | θJA = 43°C/W (DFN) - enables high-power density designs with minimal heatsinking. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND, must be soldered to PCB ground).
| 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. |
| TRACK/SS (2) | Tracking input / soft-start control | Enables output voltage tracking of external rail or programs soft-start time via external capacitor. |
| VFB (3) | Feedback input | Compares divided output voltage against 0.6V reference to regulate VOUT. |
| ITH (4) | Error amplifier output / current threshold | Sets peak inductor current threshold (0.7–2.0V range); determines current limit and loop stability. |
| RUN (5) | Enable control | Pulling below 1.1V disables controller; release enables internal 0.7μA soft-start pull-up. |
| IPRG (6) | Peak sense threshold select | Three-state pin selecting 70mV (GND), 125mV (float), or 223mV (VIN) max ΔVSENSE. |
| BG (7) | Bottom gate driver | Drives N-channel MOSFET gate from PGND to VIN; supports synchronous rectification. |
| TG (8) | Top gate driver | Drives P-channel MOSFET gate from PGND to VIN; optimized for low-side referenced drive. |
| VIN (9) | Power supply input | Supplies internal circuitry and gate drivers; serves as positive input to current comparator. |
| SW (10) | Switch node | Connects to drains of both MOSFETs and inductor; negative input to current comparator. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | VDS sensing across external P-MOSFET eliminates power loss and board space of RSENSE, improving efficiency >90% at mid-load. |
| Selectably optimized light-load efficiency | Burst Mode® reduces quiescent current to ~105μA and maintains >80% efficiency at 1mA load. |
| Programmable peak current limit | IPRG pin configures ΔVSENSE(MAX) to 70/125/223mV - allows precise current limiting without changing external components. |
| Output voltage tracking | TRACK/SS pin enables coincident or ratiometric startup sequencing with other rails - critical for multi-rail FPGAs and processors. |
| Low dropout operation | 100% duty cycle support maintains regulation down to VIN – VDS(ON) – IOUTRINDUCTOR, extending runtime in battery-depleted conditions. |
| Integrated fault protection | Overvoltage comparator (0.68V at VFB) and short-circuit current limit prevent damage during transients or output faults. |
Applications
| Portable Instrument Power | Notebook CPU Core Supply |
|---|---|
Use Scenario: Handheld multimeter or portable oscilloscope powered by dual-cell Li-ion (7.2V–8.4V) requiring clean, sequenced 3.3V and 1.2V rails. IC Role / Device Role / Timing Role: LTC3809EDD-1#TRPBF acts as primary buck controller for 1.2V core rail, using TRACK/SS to track 3.3V rail startup and IPRG to set 125mV current limit for 2A max load. Use Value: Eliminates sense resistor losses, enabling >92% efficiency at 1.5A while maintaining <1% output deviation during battery voltage sag. | Use Scenario: Low-voltage CPU core supply in ultra-thin notebook where input voltage drops to 3.3V under load and output must remain stable at 1.05V/3A. IC Role / Device Role / Timing Role: LTC3809EDD-1#TRPBF operates in forced continuous mode (MODE = GND) to suppress audible noise, using 100% duty cycle capability to sustain regulation when VIN approaches VOUT. Use Value: Maintains 1.05V ±15mV regulation down to VIN = 1.15V, extending usable battery life by 8–12 minutes versus resistor-based controllers. |
| Distributed DC Power System | Programmable Logic Sequencing |
Use Scenario: Industrial IoT gateway with 5V backplane supplying multiple isolated 3.3V/2.5V/1.8V rails via local DC/DC converters. IC Role / Device Role / Timing Role: LTC3809EDD-1#TRPBF controls one 1.8V/2A rail, using Burst Mode® (MODE = VIN) to achieve <15μA no-load input current and meet Energy Star standby requirements. Use Value: Reduces system standby power by 420μW versus continuous-mode alternatives, enabling 10-year battery backup for real-time clock. | Use Scenario: FPGA configuration sequence requiring strict 0→1.2V→2.5V→3.3V power-up order with <100μs inter-rail delay. IC Role / Device Role / Timing Role: LTC3809EDD-1#TRPBF generates 1.2V rail with TRACK/SS tied to 2.5V rail via 1:2 divider, ensuring monotonic, slope-matched startup without external timers. Use Value: Guarantees zero reverse current and <±2% tracking error across –40°C to +85°C, eliminating FPGA configuration failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EDD#TRPBF | Higher 750kHz frequency; integrated bootstrap diode; no IPRG pin; requires external sense resistor. | Designed for higher-density layouts; lacks No RSENSE™ architecture and tracking flexibility. | Choose only if higher switching frequency and integrated bootstrap are prioritized over sense-resistor elimination and precise tracking. |
| TPS54202DDCR | Fixed 500kHz frequency; integrated MOSFETs; 4.5–17V input; no TRACK/SS or MODE pin functionality. | Monolithic solution for lower-current (<2A), higher-input applications; no external MOSFET flexibility or advanced sequencing. | Prefer for cost-sensitive, low-complexity designs where external FET control and multi-rail tracking are unnecessary. |
Compared with LTC3850EDD#TRPBF and TPS54202DDCR, the LTC3809EDD-1#TRPBF uniquely combines No RSENSE™ operation, programmable peak current threshold, and precision output tracking - making it optimal for high-efficiency, multi-rail portable systems where board space and battery life are constrained.
Availability
LTC3809EDD-1#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, notebook computing, distributed power systems, and FPGA sequencing applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LTC3809EDD-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3809EDD-1#TRPBF belongs to Linear's No RSENSE™ synchronous controller family, engineered specifically for high-efficiency, low-input-voltage DC/DC conversion in space-constrained portable and battery-operated systems.
FAQ
What is the function of the IPRG pin on the LTC3809EDD-1#TRPBF?
The IPRG pin on the LTC3809EDD-1#TRPBF selects the maximum allowable voltage drop (ΔVSENSE(MAX)) between VIN and SW pins, thereby setting the peak current limit without a sense resistor. When tied to GND, it configures 70mV; floating yields 125mV; and connection to VIN sets 223mV. This directly determines the maximum inductor current based on the P-channel MOSFET's RDS(ON), enabling precise current limiting tailored to specific FET selections in the LTC3809EDD-1#TRPBF design.
Does the LTC3809EDD-1#TRPBF support output voltage tracking, and how is it implemented?
Yes, the LTC3809EDD-1#TRPBF supports both coincident and ratiometric output voltage tracking via the TRACK/SS pin. When an external voltage (e.g., from another regulator) is applied through a resistor divider to TRACK/SS, the LTC3809EDD-1#TRPBF regulates VFB to match that voltage during startup - causing VOUT to "track" the external rail. This eliminates sequencing components and ensures monotonic, slope-controlled power-up essential for FPGAs and multi-core processors using the LTC3809EDD-1#TRPBF.
How does the LTC3809EDD-1#TRPBF achieve high efficiency at light loads?
The LTC3809EDD-1#TRPBF achieves high light-load efficiency via selectable Burst Mode® operation, activated by tying the MODE pin to VIN. In this mode, the controller skips switching cycles when load current falls below ~200mA, reducing quiescent current to ~105μA and maintaining >80% efficiency at 1mA. Unlike forced continuous mode, Burst Mode® minimizes switching and gate drive losses while preserving regulation - a key advantage of the LTC3809EDD-1#TRPBF in battery-powered standby applications.
What package type and thermal characteristics does the LTC3809EDD-1#TRPBF use?
The LTC3809EDD-1#TRPBF uses a 10-lead (3mm × 3mm) plastic DFN package with an exposed thermal pad (Pin 11 = GND) that must be soldered to the PCB ground plane. Its thermal resistance is θJA = 43°C/W, enabling efficient heat dissipation in compact layouts. The exposed pad significantly lowers junction-to-board thermal impedance, supporting continuous 2A output operation at ambient temperatures up to +85°C - a critical specification confirmed in the LTC3809EDD-1#TRPBF datasheet and layout guidelines.
Can the LTC3809EDD-1#TRPBF operate with input voltages below 3V, and what protections apply?
Yes, the LTC3809EDD-1#TRPBF operates with input voltages as low as 2.75V and includes undervoltage lockout (UVLO) with a rising threshold of 2.25V. Below this threshold, all internal circuits and gate drivers disable, drawing only 9μA. This protects downstream circuitry during brownout conditions and ensures reliable restart once VIN exceeds 2.45V. The UVLO hysteresis (200mV) prevents chatter near the threshold - a verified behavior documented in the LTC3809EDD-1#TRPBF electrical characteristics table.
LTC3809EDD-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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-DFN (3x3)
LTC3809EDD-1#TRPBF FAQ
1.How can I place an order for LTC3809EDD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3809EDD-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 LTC3809EDD-1#TRPBF reliable?
The price and inventory of LTC3809EDD-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 LTC3809EDD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3809EDD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3809EDD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3809EDD-1#TRPBF?
LTC3809EDD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3809EDD-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 LTC3809EDD-1#TRPBF?
For technical support, including LTC3809EDD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3809EDD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3809EDD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3809EDD-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 LTC3809EDD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3809EDD-1#TRPBF?
All LTC3809EDD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3809EDD-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 LTC3809EDD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3809EDD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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