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Analog Devices Inc. LTC3409AIDD#TRPBF
- Part No.:
- LTC3409AIDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3409AIDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
LTC3409AIDD#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, monolithic synchronous step-down DC/DC converter optimized for low-input-voltage battery-powered systems. It delivers up to 600mA output current across a 1.6V–5.5V input range, supports adjustable output voltages from 0.62V to 5.5V via external resistor divider, operates at selectable 1.7MHz or 2.6MHz fixed frequencies or synchronizable 1MHz–3MHz external clock, and features Burst Mode® operation with 65μA quiescent current - enabling extended runtime in portable devices like digital cameras and MP3 players.
For engineers reviewing the LTC3409AIDD#TRPBF datasheet, LTC3409AIDD#TRPBF pinout, LTC3409AIDD#TRPBF application, or LTC3409AIDD#TRPBF equivalent, key selection criteria include its 8-lead 3mm × 3mm DFN package, internal soft-start, 0.612V reference voltage, 100% duty cycle dropout capability, and dual-mode (Burst/Pulse-Skipping) control for light-load efficiency optimization.
Technical Context
The LTC3409AIDD#TRPBF employs a constant-frequency, current-mode architecture with integrated P-channel main and N-channel synchronous MOSFETs. Its control loop uses an error amplifier referenced to a precise 0.612V internal bandgap, with slope compensation active above 40% duty cycle to prevent subharmonic oscillation.
Burst Mode operation is enabled by grounding the MODE pin, reducing quiescent current to 65μA while maintaining regulation via intermittent switching; Pulse-Skipping mode (MODE pin >1.1V) provides lower output ripple at moderate-to-heavy loads. The SYNC pin supports either fixed-frequency selection (1.7MHz/2.6MHz) or external clock synchronization from 1MHz to 3MHz with 100ns minimum pulse width.
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, or 2-cell alkaline/NiMH batteries without external LDO pre-regulation. |
| Output Voltage Range | 0.62V to 5.5V - programmable via external resistor divider; 0.612V feedback reference enables accurate low-VOUT regulation. |
| Max Output Current | 600mA at VIN = 1.8V, VOUT = 1.2V - limited by thermal design and peak inductor current of 750mA. |
| Switching Frequency | Selectable 1.7MHz or 2.6MHz, or synchronizable 1MHz–3MHz - enables use of compact 1–2.2μH ceramic-compatible inductors. |
| Quiescent Current | 65μA in Burst Mode, <1μA in shutdown - extends battery life in standby and ultra-light-load conditions. |
| Efficiency | Up to 95% - achieved via synchronous rectification eliminating Schottky loss and low RDS(ON) switches (0.35Ω P-FET, 0.25Ω N-FET). |
| Duty Cycle | 100% - supports low-dropout operation when VIN approaches VOUT, critical for end-of-battery-life performance. |
| Package | 8-lead 3mm × 3mm × 0.75mm DFN with exposed pad - requires soldered GND pad for thermal and electrical integrity. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 3mm, 0.75mm height) with exposed thermal pad (Pin 9, GND). Requires PCB land pattern per manufacturer's recommended footprint and solder stencil.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback input | Connects to resistive divider midpoint; regulates output by comparing against 0.612V reference - enables precision output programming and remote sensing. |
| GND (Pin 2) | Ground reference | Primary analog ground return; must be tied to exposed pad (Pin 9) and low-impedance system GND plane. |
| VIN (Pins 3, 4) | Main power input | High-current input pins requiring local 4.7μF+ ceramic decoupling; dual pins reduce trace resistance and improve thermal path. |
| MODE (Pin 5) | Operating mode select | Logic-level input: <0.3V enables Burst Mode (65μA IQ); >1.1V enables Pulse-Skipping (lower ripple, higher light-load IQ). |
| SW (Pin 6) | Switch node | Drain connection of internal P- and N-MOSFETs; drives external inductor - requires short, low-inductance layout to minimize EMI and ringing. |
| RUN (Pin 7) | Enable/shutdown control | Active-high enable: <0.3V disables all circuitry (<1μA IQ); >1.1V activates regulator with 1ms soft-start ramp. |
| SYNC (Pin 8) | Frequency control | Configures oscillator: <0.3V → 1.7MHz, >1.1V → 2.6MHz, or 1–3MHz external clock - enables EMI reduction and multi-rail synchronization. |
| Exposed Pad (Pin 9) | Thermal/GND connection | Must be soldered to solid GND copper area - provides primary thermal dissipation path and reduces junction-to-board θJA to 43°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Eliminates external Schottky diode, reduces conduction loss, and improves efficiency across full load range - especially critical below 1.8V input. |
| Burst Mode® Operation | Reduces quiescent current to 65μA at light loads while maintaining ±1% output regulation - directly extends battery runtime in always-on portable systems. |
| Internal Soft-Start | Linearly ramps internal reference from 0V to 0.612V over 1ms - prevents inrush current, eliminates need for external soft-start capacitor or sequencing circuitry. |
| 100% Duty Cycle Capability | Enables dropout operation down to VIN ≈ VOUT + ILOAD×(RDS(ON)P-FET + RINDUCTOR) - sustains regulated output as battery discharges to endpoint voltage. |
| Stable with Ceramic Capacitors | Does not require output capacitor ESR for loop stability - allows use of low-ESR, high-capacitance X5R/X7R ceramics for minimal size, low ripple, and improved transient response. |
| Overtemperature Protection | Shuts down both power switches when junction temperature exceeds ~150°C - protects device during overload or poor thermal design without latch-up. |
Applications
| Cellular Phone Power Management | Digital Camera Core Supply |
|---|---|
Use Scenario: Regulating Li-ion battery voltage (3.0–4.2V) to 1.2V core rail for baseband processor during active and standby modes. IC Role / Device Role / Timing Role: Primary synchronous buck converter providing tightly regulated, low-noise core voltage with dynamic mode switching. Use Value: Burst Mode extends standby time beyond 7 days; 100% duty cycle maintains operation until battery reaches 1.6V; 65μA IQ minimizes self-discharge. | Use Scenario: Generating 2.8V sensor/ISP supply from 3.6V nominal battery in compact camera modules with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (2.6MHz) step-down regulator enabling <1mm-height inductor placement near image sensor. Use Value: 2.6MHz operation shrinks inductor size by 40% vs 1.7MHz; ceramic capacitor compatibility achieves <10mVpp ripple without tantalum cost/size penalty. |
| MP3 Player Audio Codec Supply | Portable Medical Monitor Display Backlight |
Use Scenario: Delivering clean 1.8V supply to audio DAC/codec IC in battery-powered MP3 player with noise-sensitive analog stages. IC Role / Device Role / Timing Role: Low-ripple Pulse-Skipping mode converter activated during playback; Burst Mode engaged during pause/standby. Use Value: Pulse-Skipping reduces output ripple to <5mVpp - prevents audible beat frequencies in headphone output; seamless mode transition avoids audio glitches. | Use Scenario: Powering white LED backlight (3.2V @ 120mA) from 3.6V Li-ion battery in handheld medical monitor with Class II safety requirements. IC Role / Device Role / Timing Role: Constant-current LED driver implemented using LTC3409AIDD#TRPBF with current-sense resistor and feedback scaling. Use Value: Internal 0.612V reference enables precise current setting; 600mA capability supports up to 4 parallel LEDs; thermal shutdown ensures safe operation under fault conditions. |
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 | Fixed 1.8V/3.3V outputs only; no adjustable VOUT; 3.6V max VIN; 350mA rated output. | Not suitable for designs requiring programmable output or >3.6V input (e.g., 4.2V Li-ion full charge). | Select only for cost-sensitive, fixed-output applications with ≤3.6V input and ≤350mA load. |
| MAX17222ETA+ | Lower IQ (1.3μA in shutdown, 15μA in PFM); 500mA output; 0.4V–5.5V input; no SYNC pin or fixed-frequency option. | Lacks frequency synchronization and selectable PWM/Burst modes - unsuitable for EMI-critical or multi-rail synchronized systems. | Prefer for ultra-low-power IoT sensors where absolute minimum IQ dominates over EMI control or mode flexibility. |
Compared with TPS62231DRVR and MAX17222ETA+, the LTC3409AIDD#TRPBF uniquely combines wide 1.6V–5.5V input support, fully adjustable output, dual-mode control, and frequency synchronization - making it the only choice for high-flexibility, battery-endurance-optimized portable power designs requiring >3.6V input or programmable rails.
Availability
LTC3409AIDD#TRPBF is available at Aetrix Electronics and suitable for cellular phone power management, digital camera core supply, MP3 player audio codec supply, portable medical monitor display backlight, and other battery-operated embedded systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3409AIDD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3409A series belongs to ADI's high-efficiency micropower DC/DC converter product line, designed specifically for extending battery life in space-constrained portable electronics while maintaining tight output regulation and low EMI.
FAQ
What is the maximum output current capability of the LTC3409AIDD#TRPBF?
The LTC3409AIDD#TRPBF delivers up to 600mA continuous output current when VIN = 1.8V and VOUT = 1.2V, as specified in the datasheet. Peak inductor current is limited to 750mA. Actual achievable current depends on thermal design, input/output voltage differential, and PCB copper area - exceeding 600mA risks thermal shutdown due to junction temperature rise above 125°C.
How does the MODE pin affect efficiency and output ripple in the LTC3409AIDD#TRPBF?
The MODE pin selects between Burst Mode (grounded) and Pulse-Skipping Mode (≥1.1V). In Burst Mode, the LTC3409AIDD#TRPBF draws only 65μA quiescent current but exhibits higher output ripple due to intermittent switching. In Pulse-Skipping Mode, ripple drops significantly (<5mVpp typical) at the cost of higher light-load IQ (~120μA), making it preferable for noise-sensitive analog circuits like audio codecs.
Can the LTC3409AIDD#TRPBF operate with ceramic capacitors on both input and output?
Yes, the LTC3409AIDD#TRPBF is explicitly designed to be stable with ceramic capacitors on both input and output. Its current-mode control loop does not rely on output capacitor ESR for stability, allowing use of low-ESR X5R/X7R ceramics - which reduce board area, cost, and output ripple compared to tantalum or aluminum electrolytics.
What is the purpose of the exposed pad (Pin 9) on the LTC3409AIDD#TRPBF DFN package?
The exposed pad (Pin 9) on the LTC3409AIDD#TRPBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB GND copper pour to provide the primary thermal dissipation path (θJA = 43°C/W) and ensure reliable operation under load. Leaving it unconnected degrades thermal performance and may cause premature thermal shutdown.
Does the LTC3409AIDD#TRPBF support synchronization to an external clock source?
Yes, the LTC3409AIDD#TRPBF supports external clock synchronization via the SYNC pin (Pin 8). When driven with a clean square wave between 1MHz and 3MHz, the internal PLL locks to the external frequency - enabling EMI reduction through frequency dithering or synchronization across multiple rails in complex systems.
LTC3409AIDD#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):
- 0.62V
- 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)
LTC3409AIDD#TRPBF FAQ
1.How can I place an order for LTC3409AIDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3409AIDD#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 LTC3409AIDD#TRPBF reliable?
The price and inventory of LTC3409AIDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3409AIDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3409AIDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3409AIDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3409AIDD#TRPBF?
LTC3409AIDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3409AIDD#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 LTC3409AIDD#TRPBF?
For technical support, including LTC3409AIDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3409AIDD#TRPBF requirements.
6.How does Aetrix verify that LTC3409AIDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3409AIDD#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 LTC3409AIDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3409AIDD#TRPBF?
All LTC3409AIDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3409AIDD#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 LTC3409AIDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3409AIDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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