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Analog Devices Inc. LTC3409IDD#TRPBF
- Part No.:
- LTC3409IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3409IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,262
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Product details
Overview
LTC3409IDD#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 at light loads-enabling extended runtime in portable digital cameras and MP3 players.
For engineers reviewing the LTC3409IDD#TRPBF datasheet, LTC3409IDD#TRPBF pinout, LTC3409IDD#TRPBF application, or LTC3409IDD#TRPBF equivalent, key selection criteria include its low-VIN capability (1.6V), internal synchronous FETs eliminating external Schottky diodes, 100% duty cycle dropout support, ceramic-capacitor stability, and thermal performance in the 3mm × 3mm DFN package with exposed pad.
Technical Context
The LTC3409IDD#TRPBF employs a constant-frequency, current-mode control architecture with internal P-channel main and N-channel synchronous MOSFETs. Its error amplifier regulates output via a 0.613V feedback reference, while slope compensation prevents subharmonic oscillation above 40% duty cycle. The integrated PLL enables synchronization to external clocks (1–3MHz) or selection of fixed 1.7MHz/2.6MHz operation via the SYNC pin.
Burst Mode® operation disables switching circuitry between energy bursts to reduce quiescent current to 65μA; pulse-skip mode (selected via MODE pin) maintains lower output ripple at >30mA loads. Overtemperature protection shuts down both switches above ~150°C junction temperature, and short-circuit current limiting caps synchronous switch current at 1.5A.
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 margin for transient peaks. |
| Peak Efficiency | 95% - minimizes power loss and thermal rise in space-constrained portable enclosures. |
| Quiescent Current | 65μA in Burst Mode®, <1μA in shutdown - extends battery life during standby/sleep states. |
| Switching Frequency | Selectable 1.7MHz or 2.6MHz, or syncable 1–3MHz - enables use of compact 1–2.2μH inductors and low-ESR ceramic capacitors. |
| Reference Voltage | 0.613V ±12mV over –40°C to 85°C - sets precise output voltage via external resistor divider; stable across temperature and line/load variations. |
| RDS(ON) | P-FET: 0.35Ω, N-FET: 0.25Ω (DD package, 100mA) - determines I²R conduction losses and thermal dissipation under load. |
Pinout & Package
The LTC3409IDD#TRPBF is housed in an 8-lead, 3mm × 3mm × 0.75mm plastic DFN package (DD) with exposed thermal pad (Pin 9) that must be soldered to PCB ground for electrical integrity and optimal thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback Input | Connects to resistive divider output; senses regulated output voltage and compares to 0.613V reference to control duty cycle. |
| GND (Pin 2) | Power Ground | Primary return path for control circuitry and small-signal references; connects to exposed pad (Pin 9) for low-impedance grounding. |
| VIN (Pins 3, 4) | Main Power Input | High-current input supply pins; require local 4.7μF+ ceramic decoupling directly to GND (Pin 2 and Pin 9) to suppress switching noise. |
| MODE (Pin 5) | Operating Mode Select | Logic-level input: <0.3V enables Burst Mode® (low IQ); >1.1V enables pulse-skip mode (lower ripple, higher light-load IQ). |
| SW (Pin 6) | Switch Node | Drain connection of internal P- and N-channel MOSFETs; drives external inductor; requires careful layout to minimize EMI and ringing. |
| RUN (Pin 7) | Enable/Shutdown Control | Active-high enable: >1.1V powers up regulator with soft-start; <0.3V places device in shutdown (<1μA IQ). |
| SYNC (Pin 8) | Frequency Control | Selects 1.7MHz (low), 2.6MHz (high), or external clock sync (1–3MHz); threshold is 0.63V with 0.3V–0.93V swing for noise immunity. |
| Exposed Pad (Pin 9) | Thermal & Electrical Ground | Must be soldered to large PCB ground plane; provides primary thermal path and reduces ground impedance for high-frequency currents. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Eliminates need for external Schottky diode, reducing BOM count, board area, and forward-voltage losses - improves efficiency by ~5–10% vs. asynchronous designs. |
| Internal Soft-Start | 1ms linear ramp of internal reference (0V → 0.613V) controls output voltage rise time - prevents inrush current and output overshoot during startup without external components. |
| 100% Duty Cycle Operation | Enables dropout regulation when VIN approaches VOUT - extends usable battery voltage range and runtime in deep-discharge conditions. |
| Ceramic Capacitor Stability | Compensated control loop operates stably with zero-ESR ceramic output capacitors - enables ultra-low output ripple (<10mVPP) and smaller, more reliable filtering. |
| Overtemperature Protection | Shuts down both power switches when junction temperature exceeds ~150°C - prevents permanent damage during sustained overload or poor thermal design. |
Applications
| Digital Camera Core Power | MP3 Player Audio Codec Supply |
|---|---|
Use Scenario: Powers image sensor, ISP, and memory interface in compact digital cameras operating from single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/1.8V/2.8V rails with fast transient response to handle burst-mode image capture and video encoding. Use Value: Burst Mode® operation maintains >85% efficiency at 1–10mA standby current, extending battery life between shots; 1.7MHz switching allows use of 2.2μH inductor for minimal footprint. | Use Scenario: Supplies clean, low-noise 1.2V bias to audio DAC/ADC and 3.3V to microcontroller in portable MP3 players. IC Role / Device Role / Timing Role: Dual-rail power source with pulse-skip mode selected for audio section to minimize switching noise coupling into analog signal paths. Use Value: Pulse-skip mode reduces output ripple to <5mVPP at 100mA, preventing audible switching artifacts; ceramic capacitor compatibility ensures stable regulation under dynamic headphone load changes. |
| Cellular Phone Baseband SoC | Handheld Medical Monitor Logic Rail |
Use Scenario: Generates 1.2V core voltage for baseband processor in GSM/EDGE feature phones powered by 2-cell NiMH (2.4–3.2V). IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current buck converter supporting deep-sleep modes and rapid wake-up transitions. Use Value: 65μA Burst Mode® IQ enables >100-hour standby on 800mAh battery; RUN pin enables hardware-controlled power sequencing with 1ms soft-start. | Use Scenario: Provides regulated 1.8V logic supply for microcontroller and display driver in battery-operated handheld ECG monitors. IC Role / Device Role / Timing Role: Primary power management IC ensuring stable voltage during intermittent sensor sampling and Bluetooth LE transmission bursts. Use Value: 1.6V minimum input supports operation down to 1.65V battery voltage; overtemperature protection safeguards reliability during extended clinical use in warm environments. |
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 3MHz switching frequency; 0.6V reference; 300mA rated output (vs. 600mA); smaller 2mm × 2mm WSON package. | Better suited for ultra-compact, lower-current applications (e.g., wearables); lacks SYNC pin for external clocking. | Select TPS62231DRVR only if output current ≤300mA and board space is critical; LTC3409IDD#TRPBF preferred for higher load headroom and frequency flexibility. |
| MAX17222ELT+ | 0.6V reference; 500mA output; 1.2MHz fixed frequency; no MODE pin for Burst/PWM selection; 1.8V min input (vs. 1.6V). | Optimized for cost-sensitive, moderate-efficiency applications; lacks low-VIN capability and programmable frequency. | Choose MAX17222ELT+ for simpler designs where 1.8V min input is acceptable and Burst Mode® is not required; LTC3409IDD#TRPBF offers broader input range and superior light-load efficiency. |
Compared with TPS62231DRVR and MAX17222ELT+, the LTC3409IDD#TRPBF provides higher output current (600mA), lower minimum input voltage (1.6V), selectable or synchronizable switching frequency, and user-controllable Burst/PWM mode - making it uniquely suitable for demanding portable applications requiring long battery life and flexible power system design.
Availability
LTC3409IDD#TRPBF is available at Aetrix Electronics and suitable for digital camera power management, MP3 player audio subsystems, and cellular baseband SoC supplies requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range (–40°C to +85°C).
Supply support for LTC3409IDD#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3409 series belongs to ADI's high-efficiency, low-VIN monolithic buck regulator product line, designed specifically for battery-powered portable electronics where extended runtime, small solution size, and robust transient performance are critical.
FAQ
What is the minimum input voltage supported by the LTC3409IDD#TRPBF?
The LTC3409IDD#TRPBF supports a minimum input voltage of 1.6V, enabling operation directly from partially discharged single-cell Li-ion, Li-metal, or dual-cell alkaline/NiMH batteries. This low-VIN capability is verified across the full –40°C to +85°C operating temperature range and allows the LTC3409IDD#TRPBF to maintain regulation until the battery reaches end-of-life voltage, maximizing usable capacity.
How does the MODE pin affect efficiency and output ripple in the LTC3409IDD#TRPBF?
The MODE pin on the LTC3409IDD#TRPBF selects between Burst Mode® (MODE < 0.3V) and pulse-skip mode (MODE > 1.1V). In Burst Mode®, the LTC3409IDD#TRPBF achieves 65μA quiescent current and >85% efficiency at 1–10mA loads but exhibits higher output ripple due to intermittent switching. In pulse-skip mode, ripple drops below 5mVPP at 100mA but quiescent current rises to 120μA - making it preferable for noise-sensitive audio sections.
Can the LTC3409IDD#TRPBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3409IDD#TRPBF can synchronize to an external clock applied to the SYNC pin across a 1MHz to 3MHz range. The SYNC threshold is nominally 0.63V with recommended swing of 0.33V–0.93V for noise immunity. When synchronized, the LTC3409IDD#TRPBF locks its internal oscillator to the external clock, enabling EMI reduction through frequency dithering or alignment with system timing domains.
What is the purpose of the exposed pad (Pin 9) on the LTC3409IDD#TRPBF, and how must it be handled in PCB layout?
The exposed pad (Pin 9) on the LTC3409IDD#TRPBF serves as both thermal dissipation path and electrical ground connection. It must be soldered to a solid PCB ground plane using multiple thermal vias to achieve the specified θJA = 43°C/W. Failure to connect the exposed pad results in elevated junction temperature, reduced output current capability, and potential thermal shutdown - the LTC3409IDD#TRPBF datasheet explicitly requires this connection for guaranteed performance.
Does the LTC3409IDD#TRPBF require an external Schottky diode, and why or why not?
No, the LTC3409IDD#TRPBF does not require an external Schottky diode because it integrates both a P-channel main switch and an N-channel synchronous rectifier switch. This synchronous architecture eliminates the forward-voltage drop and associated power loss of a discrete diode, improving efficiency by 5–10% and simplifying the bill of materials - a key design advantage confirmed in the LTC3409IDD#TRPBF datasheet's "No Schottky Diode Required" feature statement.
LTC3409IDD#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)
LTC3409IDD#TRPBF FAQ
1.How can I place an order for LTC3409IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3409IDD#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 LTC3409IDD#TRPBF reliable?
The price and inventory of LTC3409IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3409IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3409IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3409IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3409IDD#TRPBF?
LTC3409IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3409IDD#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 LTC3409IDD#TRPBF?
For technical support, including LTC3409IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3409IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3409IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3409IDD#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 LTC3409IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3409IDD#TRPBF?
All LTC3409IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3409IDD#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 LTC3409IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3409IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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