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Analog Devices Inc. LTC3409IDD#PBF
- Part No.:
- LTC3409IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3409IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,104
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Product details
Overview
LTC3409IDD#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, monolithic synchronous step-down DC/DC converter optimized for single-cell Li-ion and multi-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 - enabling compact designs in portable electronics including MP3 players, digital cameras, and cellular handsets.
For engineers reviewing the LTC3409IDD#PBF datasheet, LTC3409IDD#PBF pinout, LTC3409IDD#PBF application, or LTC3409IDD#PBF equivalent, key selection criteria include its Burst Mode® quiescent current (65μA), 100% duty cycle low-dropout capability, internal soft-start (1ms), overtemperature protection, and stable operation with ceramic output capacitors - all within an 8-lead 3mm × 3mm DFN package.
Technical Context
The LTC3409IDD#PBF employs a constant-frequency, current-mode control architecture with integrated P-channel main and N-channel synchronous MOSFETs. Its peak inductor current limit is 750mA, and it uses slope compensation above 40% duty cycle to prevent subharmonic oscillation.
It supports three operating modes: Burst Mode® (enabled via MODE pin <0.3V), pulse-skipping PWM (MODE >1.1V), and shutdown (<1μA supply current). The internal PLL synchronizes to external clocks from 1MHz to 3MHz, and the SYNC pin also selects fixed 1.7MHz (low) or 2.6MHz (high) frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.6V to 5.5V - supports single Li-ion (2.7–4.2V), Li-metal, or 2-cell alkaline/NiCd/NiMH (2.4–3.2V) without external LDO pre-regulation. |
| Output Current | 600mA at VIN=1.8V, VOUT=1.2V - sufficient for core logic rails in portable SoCs and microcontrollers. |
| Switching Frequency | Selectable 1.7MHz or 2.6MHz fixed, or 1–3MHz external sync - enables use of small 1–3.3μH inductors and 4.7–10μF ceramic capacitors. |
| Quiescent Current | 65μA in Burst Mode®, <1μA in shutdown - extends battery runtime in standby and ultra-low-power sleep states. |
| Feedback Reference | 0.613V ±12mV (–40°C to 85°C) - sets precise output voltage via external resistor divider; enables remote sensing. |
| Efficiency | Up to 95% at medium loads - achieved via synchronous rectification eliminating Schottky diode loss and low RDS(ON) switches (0.35Ω P-FET / 0.25Ω N-FET). |
| Duty Cycle | 100% - maintains regulation down to VIN ≈ VOUT, critical for end-of-battery-life operation in portable systems. |
| Thermal Protection | Overtemperature shutdown at TJ >125°C - prevents damage during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 9), 0.75mm profile. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback input | Connects to resistive divider; regulates output by comparing divided VOUT to 0.613V reference. |
| GND (Pin 2) | Ground reference | Primary analog and power ground return; ties to exposed pad (Pin 9) for lowest impedance path. |
| VIN (Pins 3, 4) | Main power input | High-current input nodes requiring local 4.7μF+ ceramic decoupling; dual pins reduce trace resistance and inductance. |
| MODE (Pin 5) | Operating mode select | Logic-level input: <0.3V = Burst Mode®, >1.1V = pulse-skip PWM; floating state is undefined and must be avoided. |
| SW (Pin 6) | Switch node | Drain connection of internal P- and N-MOSFETs; connects directly to inductor; high dv/dt node requiring tight layout. |
| RUN (Pin 7) | Enable/disable control | Active-high enable: >1.1V = on, <0.3V = shutdown (<1μA IQ); internal pull-down not provided - external bias required. |
| SYNC (Pin 8) | Frequency control | Selects 1.7MHz (low), 2.6MHz (high), or external clock sync (1–3MHz); threshold 0.63V with 0.3V noise margin. |
| Exposed Pad (Pin 9) | Thermal & ground plane | Electrically GND; mandatory solder connection to PCB ground pour for thermal dissipation (θJA = 43°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency across full load range. |
| Burst Mode® operation | Reduces quiescent current to 65μA at light loads while maintaining regulated output - ideal for battery standby. |
| Internal soft-start | 1ms linear ramp of internal reference ensures controlled VOUT rise time without external components or overshoot. |
| Ceramic capacitor stability | No ESR dependency in control loop - enables use of low-ESR, high-RMS-current X5R/X7R ceramics for minimal size and ripple. |
| 100% duty cycle capability | Maintains regulation when VIN drops to VOUT level - maximizes usable battery capacity in portable applications. |
| Overtemperature protection | Automatic shutdown above 125°C junction temperature - safeguards device during thermal overload or poor heatsinking. |
Applications
| Portable Audio Systems | Digital Camera Core Power |
|---|---|
Use Scenario: Powering DSP, ADC, and audio codec in battery-operated MP3 players and Bluetooth headsets. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.2V/1.8V core voltage with fast transient response to bursty processing loads. Use Value: Burst Mode® extends playback time by minimizing no-load IQ; 100% duty cycle sustains operation until battery reaches 1.6V cutoff. |
Use Scenario: Supplying image sensor and ISP in compact digital cameras with dual-cell alkaline or Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency step-down converter generating 2.5V/3.3V rails with low noise and minimal board area. Use Value: 2.6MHz switching allows tiny 2.2μH inductor and 4.7μF ceramic cap; synchronous design avoids diode forward drop loss. |
| Cellular Handset Baseband | Wearable Sensor Hub |
Use Scenario: Regulating power for baseband processor and RF transceiver in GSM/3G feature phones. IC Role / Device Role / Timing Role: Input-stage buck converter accepting wide 2.7–4.2V Li-ion range and delivering clean 1.2V core supply. Use Value: Pulse-skip mode reduces output ripple during voice calls; SYNC pin enables EMI reduction via frequency dithering. |
Use Scenario: Powering ultra-low-power MCU, accelerometer, and BLE radio in fitness trackers and smartwatches. IC Role / Device Role / Timing Role: Always-on buck regulator with deep-sleep IQ of 65μA and fast wake-up from RUN pin control. Use Value: Shutdown current <1μA enables months of shelf life; small DFN package fits constrained wearable PCB real estate. |
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; 400mA IOUT max; 1.8–6.5V input. | Not suitable for adjustable-output or >600mA load applications; lacks Burst Mode® and 100% duty cycle. | Choose only if fixed 3.3V output and lower current suffice - simpler BOM but less flexible than LTC3409IDD#PBF. |
| MAX17222ELT+T | 1.8–5.5V input; 500mA IOUT; 1.2MHz fixed freq; 2.5μA IQ in shutdown; no MODE pin for Burst/PWM selection. | Lower IQ in shutdown but higher light-load IQ (12μA vs 65μA Burst); no external sync or frequency selection. | Prefer for ultra-low-shutdown-power apps where Burst Mode® flexibility and sync capability are unnecessary. |
Compared with TPS62231DRVR and MAX17222ELT+T, the LTC3409IDD#PBF offers wider input range, higher output current, user-selectable Burst/PWM modes, external clock synchronization, and true 100% duty cycle - making it uniquely suited for high-flexibility, battery-critical portable designs.
Availability
LTC3409IDD#PBF is available at Aetrix Electronics and suitable for portable audio systems, digital camera power management, cellular handset baseband supplies, wearable sensor hubs, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.
Supply support for LTC3409IDD#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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio. Linear pioneered high-performance DC/DC regulators with proprietary architectures like Burst Mode®.
The LTC3409 belongs to Linear's high-efficiency, low-voltage synchronous buck regulator family designed specifically for battery-powered portable electronics demanding extended runtime, small footprint, and robust transient response.
FAQ
What is the maximum output current capability of the LTC3409IDD#PBF?
The LTC3409IDD#PBF delivers up to 600mA continuous output current under typical conditions (VIN = 1.8V, VOUT = 1.2V). Peak inductor current is rated at 750mA. Actual achievable current depends on input voltage, output voltage, ambient temperature, PCB thermal design, and inductor saturation rating - with derating required near thermal limits or dropout conditions.
Does the LTC3409IDD#PBF require an external Schottky diode?
No, the LTC3409IDD#PBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, enabling fully synchronous operation that eliminates conduction losses associated with external diodes and improves efficiency across all load conditions.
How does the MODE pin affect operation of the LTC3409IDD#PBF?
The MODE pin on the LTC3409IDD#PBF selects between two operating modes: pulling MODE below 0.3V enables Burst Mode® for ultra-low quiescent current (65μA), while driving MODE above 1.1V activates pulse-skipping PWM mode for lower output ripple and better EMI performance. Leaving MODE floating is undefined and must be avoided.
Can the LTC3409IDD#PBF operate with ceramic output capacitors?
Yes, the LTC3409IDD#PBF is explicitly designed to be stable with ceramic output capacitors. Its current-mode control loop does not rely on capacitor ESR for stability, allowing use of low-ESR X5R/X7R ceramics - which reduce output ripple, save board space, and improve reliability compared to tantalum or aluminum electrolytics.
What is the purpose of the exposed pad (Pin 9) on the LTC3409IDD#PBF?
The exposed pad (Pin 9) on the LTC3409IDD#PBF is electrically connected to GND and serves dual thermal and electrical functions. It must be soldered to a PCB ground plane to achieve the specified θJA of 43°C/W and ensure reliable operation under load. Omitting this connection risks thermal shutdown and reduced lifetime.
How does the SYNC pin function on the LTC3409IDD#PBF?
The SYNC pin on the LTC3409IDD#PBF provides three functions: holding it low (>30μs) selects 1.7MHz operation, holding it high (>30μs) selects 2.6MHz, and applying a 1–3MHz external clock enables synchronization - reducing EMI by aligning switching edges to a system master clock and avoiding beat frequencies.
LTC3409IDD#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)
LTC3409IDD#PBF FAQ
1.How can I place an order for LTC3409IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3409IDD#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 LTC3409IDD#PBF reliable?
The price and inventory of LTC3409IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3409IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3409IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3409IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3409IDD#PBF?
LTC3409IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3409IDD#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 LTC3409IDD#PBF?
For technical support, including LTC3409IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3409IDD#PBF requirements.
6.How does Aetrix verify that LTC3409IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3409IDD#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 LTC3409IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3409IDD#PBF?
All LTC3409IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3409IDD#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 LTC3409IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3409IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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