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Analog Devices Inc. LTC3409EDD#PBF
- Part No.:
- LTC3409EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3409EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:304
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Product details
Overview
LTC3409EDD#PBF 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 95% peak efficiency, operates from 1.6V to 5.5V input, supports selectable 1.7MHz or 2.6MHz fixed-frequency operation or external synchronization (1–3MHz), and features Burst Mode® for ultra-low 65μA quiescent current at light loads - enabling extended runtime in portable audio and imaging devices.
For engineers reviewing the LTC3409EDD#PBF datasheet, LTC3409EDD#PBF pinout, LTC3409EDD#PBF application, or LTC3409EDD#PBF equivalent, key selection criteria include its 8-lead 3mm × 3mm DFN package with exposed thermal pad, internal 0.613V reference, 100% duty-cycle dropout capability, and precise MODE/RUN/SYNC logic thresholds critical for low-power system sequencing and EMI-sensitive designs.
Technical Context
The LTC3409EDD#PBF implements a constant-frequency, current-mode synchronous buck architecture with integrated P-channel main and N-channel synchronous MOSFETs. Its control loop uses slope compensation above 40% duty cycle to prevent subharmonic oscillation and includes overvoltage detection (ΔVFBOVL = +35mV to +85mV) and overtemperature protection activating at ~150°C.
It supports three operational modes: Burst Mode® (MODE < 0.3V) for <65μA IQ at light loads, pulse-skip mode (MODE > 1.1V) for lower output ripple, and shutdown (<1μA IQ, RUN < 0.3V). The SYNC pin enables either fixed-frequency selection (1.7MHz/2.6MHz) or external clock synchronization with 100ns minimum pulse width and 30μs timeout recovery.
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 (1.8–3.6V), and 2-cell alkaline/NiMH (2.4–3.2V) without external LDO pre-regulation. |
| Output Current | 600mA @ VIN=1.8V, VOUT=1.2V - sufficient for baseband processors, camera ISPs, and audio codecs in space-constrained handhelds. |
| Switching Frequency | Selectable 1.7MHz or 2.6MHz, or syncable 1–3MHz - enables use of compact 1–2.2μH shielded inductors and ceramic capacitors to minimize PCB area. |
| Quiescent Current | 65μA in Burst Mode®, <1μA in shutdown - extends battery life during standby in cellular phones and MP3 players. |
| Feedback Reference | 0.613V ±12mV (–40°C to 85°C) - sets output voltage via external resistor divider; enables precise 1.2V, 1.5V, 1.8V, or 3.3V rails with <0.5% load regulation. |
| RDS(ON) | P-FET: 0.35Ω, N-FET: 0.25Ω (DD package, 100mA) - minimizes conduction loss in high-duty-cycle dropout operation (e.g., 1.6VIN/1.2VOUT). |
| Soft-Start Time | 1ms - linear ramp of internal reference prevents inrush current into output capacitors during power-up. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 9), 0.75mm profile, RoHS-compliant lead-free finish. Exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback input | Connects to resistor divider midpoint; regulates output by comparing against 0.613V reference - enables remote sensing and programmable VOUT. |
| GND (Pin 2) | Power ground | Primary return path for control circuitry; ties to exposed pad (Pin 9) for low-impedance grounding and thermal dissipation. |
| VIN (Pins 3, 4) | Main supply inputs | Parallel-connected high-current paths requiring local 4.7μF+ ceramic decoupling to minimize switching noise injection. |
| MODE (Pin 5) | Operating mode select | Logic-controlled: <0.3V → Burst Mode®; >1.1V → pulse-skip mode - no floating allowed; defines light-load efficiency vs. ripple trade-off. |
| SW (Pin 6) | Switch node | Drain connection of internal P- and N-MOSFETs; requires low-inductance layout to SW node capacitor and inductor to reduce EMI and voltage spikes. |
| RUN (Pin 7) | Enable/shutdown control | Active-high enable: >1.1V → normal operation; <0.3V → shutdown (<1μA IQ); critical for system-level power sequencing. |
| SYNC (Pin 8) | Frequency control | Configures oscillator: <0.3V ≥30μs → 1.7MHz; >1.1V ≥30μs → 2.6MHz; or 1–3MHz external clock - enables EMI reduction via spread-spectrum-like frequency dithering. |
| Exposed Pad (Pin 9) | Thermal & electrical ground | Must be soldered to solid PCB ground plane; provides primary thermal path (θJA = 43°C/W) and reduces GND impedance for stable regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces BOM count, improves efficiency by 5–10% at medium loads, and enables 100% duty cycle for true dropout operation. |
| Burst Mode® operation | Reduces IQ to 65μA while maintaining regulation - extends battery life >3× vs. PWM mode at 1mA load in portable devices. |
| Internal soft-start | 1ms controlled VOUT ramp - prevents output overshoot and inrush current into large output capacitors without external components. |
| Ceramic capacitor stability | Compensated for zero-ESR ceramics - allows use of small, low-cost X5R/X7R MLCCs for both input and output filtering without phase-margin degradation. |
| Overtemperature protection | Thermal shutdown at ~150°C junction temperature - protects device during sustained overload or poor PCB thermal design without latch-up. |
Applications
| Cellular Phone Power Management | Digital Camera Core Supply |
|---|---|
Use Scenario: Regulating 1.2V core voltage for baseband processor during active call and deep-sleep states. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 600mA with dynamic mode switching between Burst Mode® (sleep) and pulse-skip (active). Use Value: 65μA quiescent current in Burst Mode® extends standby time beyond 7 days on single Li-ion cell; 1.7MHz switching avoids GSM band interference. |
Use Scenario: Generating stable 1.8V supply for image signal processor (ISP) and CMOS sensor interface during burst capture. IC Role / Device Role / Timing Role: High-efficiency, low-noise step-down converter with fast transient response to handle 0→600mA load steps within 20μs. Use Value: 95% peak efficiency minimizes heat near optical module; ceramic-compatible design achieves <20mVpp output ripple for clean analog pixel data. |
| MP3 Player Audio Codec Supply | Portable Medical Sensor Node |
Use Scenario: Providing 3.3V rail for audio DAC and headphone amplifier with minimal audible switching noise. IC Role / Device Role / Timing Role: Low-EMI buck regulator operating in pulse-skip mode to suppress 1.7MHz/2.6MHz harmonics from entering audio signal path. Use Value: Pulse-skip mode reduces output ripple to <10mVpp vs. Burst Mode®'s 20–50mVpp - eliminates "buzz" in headphones during playback. |
Use Scenario: Powering ultra-low-power microcontroller and analog front-end in wearable glucose monitor with 2-cell alkaline battery. IC Role / Device Role / Timing Role: Wide-input (1.6–3.2V) buck converter maintaining regulation down to 1.6V input with 100% duty cycle. Use Value: 1.6V minimum input extends usable battery life by 15% vs. competitors; <1μA shutdown current preserves charge during 30-day storage. |
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 3.3V output (non-adjustable); 2.05MHz switching; 25μA IQ in DCS-Control™ mode | Not suitable for programmable VOUT or <1.6V input; better for fixed-rail, ultra-low-IQ IoT nodes | Select only if output voltage is fixed at 3.3V and input never drops below 2.05V. |
| MAX17222ELT+T | 0.7V to 5.5V input; 300mA output; 300kHz–2MHz adjustable frequency; 1.6μA IQ in shutdown | Lower current rating limits use to sub-300mA peripherals; wider input range suits energy-harvesting sources | Prefer when input may fall below 1.6V or when <300mA load suffices and lowest possible shutdown IQ is required. |
Compared with TPS62231DRVR and MAX17222ELT+T, the LTC3409EDD#PBF offers programmable output voltage, higher 600mA output current, and superior light-load efficiency in Burst Mode® - making it optimal for multi-rail, battery-critical portable systems where flexibility and runtime are prioritized over minimal shutdown current.
Availability
LTC3409EDD#PBF is available at Aetrix Electronics and suitable for cellular phone power management, digital camera core supply, and MP3 player audio codec applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3409EDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3409EDD#PBF belongs to Linear's legacy µPower DC/DC converter product line, specifically engineered for ultra-low-power, high-efficiency battery-operated portable electronics where size, thermal performance, and light-load efficiency are critical design constraints.
FAQ
What is the maximum output current capability of the LTC3409EDD#PBF under worst-case conditions?
The LTC3409EDD#PBF delivers 600mA continuous output current when VIN = 1.8V and VOUT = 1.2V, as specified in the Electrical Characteristics table. Peak inductor current is rated at 750mA. Derating is required at higher ambient temperatures or lower input voltages due to thermal limits - for example, at TA = 85°C and VIN = 1.6V, practical output current is limited to ~450mA to maintain TJ < 125°C with standard PCB copper area.
Can the LTC3409EDD#PBF operate with a 1.5V input supply?
No - the absolute minimum input voltage for functional operation of the LTC3409EDD#PBF is 1.6V, as defined in the Absolute Maximum Ratings and confirmed across all operating conditions in the Electrical Characteristics. Operation below 1.6V risks failure to regulate, erratic switching, or undervoltage lockout; the device will not start or sustain regulation at 1.5V input.
How does the MODE pin affect efficiency and output ripple in the LTC3409EDD#PBF?
The MODE pin selects between Burst Mode® (<0.3V) and pulse-skip mode (>1.1V). In Burst Mode®, the LTC3409EDD#PBF achieves 65μA IQ and >85% efficiency at 1mA load but produces higher output ripple (20–50mVpp). In pulse-skip mode, IQ rises to ~120μA and light-load efficiency drops, yet ripple falls to <10mVpp - making it preferable for noise-sensitive analog circuits like audio DACs.
Is an external Schottky diode required when using the LTC3409EDD#PBF?
No - the LTC3409EDD#PBF integrates both a P-channel main switch and an N-channel synchronous rectifier, eliminating the need for any external diode. This reduces component count, improves efficiency by 5–10% at medium loads, and enables 100% duty-cycle operation for true dropout performance - a key advantage over asynchronous buck controllers.
What is the recommended PCB layout practice for the exposed thermal pad of the LTC3409EDD#PBF?
The exposed pad (Pin 9) of the LTC3409EDD#PBF must be soldered to a solid, low-thermal-resistance PCB ground plane using ≥4 thermal vias (0.3mm diameter, spaced ≤1mm apart) connecting to inner or bottom-layer ground planes. Insufficient thermal pad soldering causes junction temperature rise >20°C, triggering premature thermal shutdown and reducing maximum sustainable output current by up to 30%.
LTC3409EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3409EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3409EDD#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 LTC3409EDD#PBF reliable?
The price and inventory of LTC3409EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3409EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3409EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3409EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3409EDD#PBF?
LTC3409EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3409EDD#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 LTC3409EDD#PBF?
For technical support, including LTC3409EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3409EDD#PBF requirements.
6.How does Aetrix verify that LTC3409EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3409EDD#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 LTC3409EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3409EDD#PBF?
All LTC3409EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3409EDD#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 LTC3409EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3409EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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