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Analog Devices Inc. LTC3409EDD#TRPBF
- Part No.:
- LTC3409EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3409EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,649
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Product details
Overview
LTC3409EDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter optimized for single-cell Li-ion, Li-metal, and dual-cell alkaline/NiMH battery-powered systems. It delivers up to 600mA output current with 1.6V–5.5V input range, 0.613V reference voltage, and selectable 1.7MHz/2.6MHz fixed-frequency or externally synchronized operation (1MHz–3MHz). Its Burst Mode® operation achieves 95% peak efficiency and only 65μA quiescent current, enabling extended runtime in portable digital cameras and MP3 players.
For engineers reviewing the LTC3409EDD#TRPBF datasheet, LTC3409EDD#TRPBF pinout, LTC3409EDD#TRPBF application, or LTC3409EDD#TRPBF equivalent, key selection criteria include its 8-lead 3mm × 3mm DFN package with exposed thermal pad, internal P/N-channel MOSFETs eliminating external Schottky diodes, 100% duty cycle low-dropout capability, and precise feedback threshold (0.613V ±12mV over –40°C to 85°C).
Technical Context
The LTC3409EDD#TRPBF employs a constant-frequency current-mode control architecture with internal slope compensation for stability at >40% duty cycle. Its dual-switch synchronous topology integrates a 0.35Ω P-channel main switch and 0.25Ω N-channel synchronous switch (DD package, TA = 25°C), enabling high efficiency without external rectification.
Operation supports three modes: Burst Mode® (MODE < 0.3V) for ultra-low IQ at light loads, pulse-skipping PWM (MODE > 1.1V) for reduced output ripple, and external clock synchronization via SYNC pin (1–3MHz) with 0.63V threshold and 100ns minimum pulse width. Soft-start ramps the 0.613V reference over 1ms to limit inrush current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.6V to 5.5V - supports single-cell Li-ion (2.7–4.2V), Li-metal, and 2-cell alkaline/NiCd/NiMH (2.4–3.2V) without external LDO pre-regulation. |
| Output Current | 600mA @ VIN = 1.8V, VOUT = 1.2V - sufficient for core logic rails in handheld devices with tight thermal constraints. |
| Quiescent Current | 65μA in Burst Mode®, <1μA in shutdown - extends battery life during standby in always-on sensor nodes or audio playback pause states. |
| Switching Frequency | Selectable 1.7MHz or 2.6MHz fixed, or 1–3MHz externally synchronized - enables use of compact 2.2μH inductors and ceramic capacitors for space-constrained PCB layouts. |
| Feedback Reference | 0.613V ±12mV (–40°C to 85°C) - sets output voltage accuracy for 1.2V, 1.5V, 1.8V, or 2.5V rails using standard resistor dividers. |
| Peak Inductor Current | 750mA - defines minimum inductor saturation current rating required to avoid core saturation during load transients. |
| Thermal Resistance | θJA = 43°C/W - requires soldered exposed pad to PCB ground plane for reliable operation at full load in 75°C ambient. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 9), 0.75mm profile. Exposed pad must be soldered to PCB ground for electrical integrity and thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (1) | Feedback input | Connects to resistive divider; regulates output by comparing divided VOUT to 0.613V reference - enables remote sensing and precision output programming. |
| GND (2) | Power ground | Primary return path for VIN decoupling capacitor and internal power switches - must be low-impedance connection to PCB ground plane. |
| VIN (3,4) | Main supply inputs | Dual pins reduce trace resistance and inductance; require ≥4.7μF ceramic capacitor placed close to pins 3/4 and GND for stable high-frequency operation. |
| MODE (5) | Operating mode select | Logic-low (<0.3V) enables Burst Mode® for max efficiency at light loads; logic-high (>1.1V) enables pulse-skipping PWM for lower ripple in audio-sensitive applications. |
| SW (6) | Switch node | Connects to inductor; carries high di/dt square-wave current - requires short, wide copper pour to minimize EMI and voltage spikes. |
| RUN (7) | Enable control | Logic-high (>1.1V) enables regulation; logic-low (<0.3V) shuts down IC drawing <1μA - used for system-level power sequencing and battery conservation. |
| SYNC (8) | Frequency control | Fixed 1.7MHz (low), 2.6MHz (high), or external 1–3MHz clock input - allows synchronization to system clock to eliminate beat frequencies in noise-critical designs. |
| Exposed Pad (9) | Thermal & electrical ground | Must be soldered to solid PCB ground plane; provides primary thermal path and reduces ground impedance for switching loop closure. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P/N-channel MOSFETs eliminate external Schottky diode, reducing BOM count and improving efficiency by 5–10% at medium loads. |
| 100% duty cycle operation | Enables dropout regulation down to VIN ≈ VOUT, extending usable battery voltage range and runtime in Li-ion applications. |
| Internal soft-start | 1ms linear ramp of reference voltage prevents output overshoot and limits inrush current into output capacitors during power-up. |
| Ceramic capacitor compatibility | Stable with low-ESR ceramics due to current-mode control - enables compact, low-ripple designs without electrolytic or tantalum capacitors. |
| Overtemperature protection | Shuts down power switches at ~150°C junction temperature - prevents thermal runaway during sustained overload or poor PCB thermal design. |
Applications
| Digital Camera Power Rail | MP3 Player Core Logic Supply |
|---|---|
Use Scenario: Powers image sensor, ISP, and memory interface in compact digital cameras with 2.7–4.2V Li-ion battery input. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/600mA to processor core with fast transient response to burst-mode imaging loads. Use Value: Burst Mode® reduces no-load current to 65μA, extending standby time between shots; 1.7MHz switching minimizes inductor size for thin camera modules. | Use Scenario: Supplies 1.5V core voltage to audio codec and flash memory in portable MP3 players powered by dual-cell alkaline batteries (2.4–3.2V). IC Role / Device Role / Timing Role: High-efficiency step-down converter maintaining regulated output across battery discharge curve with minimal heat generation. Use Value: 100% duty cycle operation sustains regulation down to 1.55V input, extracting maximum energy from aging alkaline cells. |
| Cellular Phone Baseband SoC | Handheld Medical Monitor Display |
Use Scenario: Generates 1.8V supply for baseband processor in GSM/EDGE feature phones with Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Synchronous buck converter providing low-noise, tightly regulated power with fast load-step recovery for bursty data transmission. Use Value: Pulse-skipping mode (MODE = high) suppresses switching noise near RF sections, while 2.6MHz frequency avoids interference with cellular bands. | Use Scenario: Powers OLED display driver IC in battery-operated medical monitors requiring stable 2.5V rail from 3.6V Li-ion source. IC Role / Device Role / Timing Role: Compact, thermally efficient DC/DC converter meeting IEC 60601 leakage and reliability requirements. Use Value: Exposed-pad DFN package enables direct thermal coupling to metal enclosure, maintaining <85°C junction temp during continuous display operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | Lower 300mA output current; 2.25V–5.5V input; fixed 3MHz switching; no external sync capability. | Better suited for ultra-compact wearables with lower current needs; lacks Burst Mode® efficiency optimization below 10mA. | Select when board space is critical and load never exceeds 300mA; verify thermal performance with smaller 2mm × 2mm WSON package. |
| MAX8640YETA+ | 600mA output; 2.6V–5.5V input; fixed 2.25MHz; integrated soft-start; no MODE pin for Burst/PWM selection. | Designed for simpler point-of-load applications where Burst Mode® is not required; lacks low-VIN support for single-cell Li-metal. | Choose for cost-sensitive industrial sensors with stable 3.3V input; confirm compatibility with 1.6V–2.5V input range limitations. |
Compared with TPS62231DRVR and MAX8640YETA+, the LTC3409EDD#TRPBF uniquely supports 1.6V–5.5V input with Burst Mode® down to 65μA IQ, making it optimal for battery-powered devices requiring wide input range and ultra-low standby power - especially where 100% duty cycle operation extends usable battery voltage.
Availability
LTC3409EDD#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, digital cameras, MP3 players, and cellular handsets requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LTC3409EDD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3409EDD#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter product line, designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, wide input voltage range, and compact footprint.
FAQ
What is the minimum input voltage supported by the LTC3409EDD#TRPBF?
The LTC3409EDD#TRPBF supports a minimum input voltage of 1.6V, enabling direct regulation from single-cell Li-metal or deeply discharged Li-ion batteries. This 1.6V minimum, combined with 100% duty cycle operation, allows the LTC3409EDD#TRPBF to maintain regulation until the battery voltage drops to within ~50mV of the programmed output voltage - maximizing usable battery capacity in portable systems.
How does the MODE pin affect efficiency and output ripple in the LTC3409EDD#TRPBF?
The MODE pin on the LTC3409EDD#TRPBF selects between Burst Mode® (MODE < 0.3V) and pulse-skipping PWM (MODE > 1.1V). In Burst Mode®, the LTC3409EDD#TRPBF achieves 65μA quiescent current and >85% efficiency at 1mA load but exhibits higher output ripple. In PWM mode, ripple is reduced by 3–5× at light loads, though efficiency drops to ~70% at 1mA - making PWM preferable for noise-sensitive audio circuits despite higher IQ.
Can the LTC3409EDD#TRPBF synchronize to an external clock, and what are the timing requirements?
Yes, the LTC3409EDD#TRPBF can synchronize to an external clock applied to the SYNC pin across 1MHz–3MHz. The SYNC threshold is 0.63V nominal, requiring signal swing from 0.33V to 0.93V for noise immunity. Minimum pulse width is 100ns, and synchronization locks within 30μs of clock application. This capability allows the LTC3409EDD#TRPBF to align switching edges with system clocks, eliminating heterodyne noise in multi-rail power systems.
What thermal design considerations apply to the LTC3409EDD#TRPBF in high-current applications?
The LTC3409EDD#TRPBF requires the exposed pad (Pin 9) to be soldered to a solid PCB ground plane for thermal management. With θJA = 43°C/W, a 600mA load at 1.6V input dissipates ~173mW, raising junction temperature by ~7.4°C above ambient. To stay below the 125°C maximum, ensure ≥1cm² of 2oz copper connected to the pad and avoid enclosing the device in sealed enclosures without airflow - critical for sustained operation in medical monitors or digital cameras.
Does the LTC3409EDD#TRPBF require an external Schottky diode?
No, the LTC3409EDD#TRPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous switch, enabling fully synchronous rectification. This eliminates conduction losses associated with external diodes and improves full-load efficiency by 5–10% compared to asynchronous buck converters - a key advantage reflected in the LTC3409EDD#TRPBF's 95% peak efficiency specification.
LTC3409EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.613V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.7MHz ~ 2.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3409EDD#TRPBF FAQ
1.How can I place an order for LTC3409EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3409EDD#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 LTC3409EDD#TRPBF reliable?
The price and inventory of LTC3409EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3409EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3409EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3409EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3409EDD#TRPBF?
LTC3409EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3409EDD#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 LTC3409EDD#TRPBF?
For technical support, including LTC3409EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3409EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3409EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3409EDD#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 LTC3409EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3409EDD#TRPBF?
All LTC3409EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3409EDD#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 LTC3409EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3409EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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