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Analog Devices Inc. LTC3407AIDD-2#PBF
- Part No.:
- LTC3407AIDD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407AIDD-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,435
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Product details
Overview
LTC3407AIDD-2#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC converter designed for low-power portable systems. It operates from 2.5V to 5.5V input, delivers up to 800mA per channel, supports adjustable output voltages from 0.6V to 5V, and features 2.25MHz fixed-frequency switching with Burst Mode™ operation achieving up to 95% efficiency - used in cellular phones and digital cameras for compact dual-rail power delivery.
For engineers reviewing the LTC3407AIDD-2#PBF datasheet, LTC3407AIDD-2#PBF pinout, LTC3407AIDD-2#PBF application, or LTC3407AIDD-2#PBF equivalent, key selection considerations include its –40°C to 125°C operating temperature range, 10-lead 3mm × 3mm DFN package with exposed PGND pad, dual independent RUN/SS inputs for sequencing, and MODE/SYNC pin enabling either Burst Mode (40μA IQ) or pulse-skip operation.
Technical Context
The LTC3407AIDD-2#PBF implements a constant-frequency current-mode control architecture with shared 2.25MHz clock across both channels, enabling precise in-phase switching and fast transient response. Each channel integrates matched P-channel high-side (0.35Ω RDS(ON)) and N-channel synchronous rectifier switches, eliminating external Schottky diodes while supporting 100% duty-cycle dropout operation.
Its MODE/SYNC pin serves dual functions: selecting between Burst Mode (optimized for light-load efficiency, IQ = 40μA) and pulse-skip mode (minimizing output ripple), or synchronizing to an external clock source. The POR output provides open-drain power-on reset with ±8.5% regulation window and 65,536-cycle delay (~29ms at 2.25MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, or regulated 3.3V/5V rails without external LDO pre-regulation. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-3mm-height inductors (e.g., 2.2μH) and small ceramic capacitors for ultra-compact PCB layouts. |
| Output Current per Channel | 800mA continuous - sufficient for core logic, memory, and I/O rails in handheld devices with thermal derating per θJA = 45°C/W. |
| Feedback Reference Voltage | 0.6V ±1.2% over –40°C to 125°C - sets output voltage via external resistor divider; enables precise 0.6V–5V adjustment with <0.5% load regulation. |
| Quiescent Current | 40μA in Burst Mode - extends battery runtime in standby; drops to <1μA in shutdown with full rail isolation. |
| Operating Temperature | –40°C to +125°C - qualified for automotive infotainment, industrial sensors, and extended-temperature embedded applications. |
| Package | 10-lead 3mm × 3mm DFN with exposed PGND pad - requires soldered thermal connection to PCB ground plane for θJC = 10°C/W junction-to-case cooling. |
Pinout & Package
10-lead (3mm × 3mm) plastic DFN package with exposed power ground pad (Pin 11). Thermal performance depends on proper soldering of the exposed pad to a dedicated PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider output; regulates VOUT1 to 0.6V reference; input bias current ≤30nA minimizes divider power loss. |
| RUN/SS1 (Pin 2) | Channel 1 enable & soft-start | High = enable; low = shutdown; RC network on this pin controls output ramp rate and inrush current limiting. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling; absolute max rating = 6V. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; must be routed with minimal loop area to reduce EMI. |
| GND (Pin 5) | Analog & power ground | Common return for feedback, control, and input/output capacitors; separate from PGND pad but tied at single point. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tied to VIN = Burst Mode; tied to GND = pulse-skip; driven by external 2.25MHz clock = synchronization with other converters. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; independent inductor connection required; no internal cross-coupling between SW1/SW2. |
| POR (Pin 8) | Power-on reset output | Open-drain active-low signal asserting when either VOUT1 or VOUT2 deviates >±8.5%; delays ~29ms after regulation achieved. |
| RUN/SS2 (Pin 9) | Channel 2 enable & soft-start | Independent control of second regulator; supports staggered startup or fault-isolated shutdown. |
| VFB2 (Pin 10) | Channel 2 feedback input | Functionally identical to VFB1; allows independent output voltage setting for dual-rail systems (e.g., 1.8V + 2.5V). |
| PGND (Pin 11) | Exposed thermal pad | Must be soldered to PCB ground plane; primary thermal path; not electrically isolated - connects internally to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Two fully functional, non-interacting buck channels sharing only VIN and GND - enables split-rail power for SoC cores and I/O domains. |
| Burst Mode™ operation | 40μA total quiescent current at light loads with automatic entry/exit - extends battery life in always-on sensor nodes without sacrificing regulation accuracy. |
| Synchronous rectification | Integrated 0.35Ω P-MOS high-side + 0.30Ω N-MOS low-side switches - eliminates external Schottky diodes, reduces conduction losses, and improves efficiency above 100mA. |
| 100% duty-cycle dropout | P-MOS remains fully enhanced down to VIN ≈ VOUT - maintains regulation during brownout conditions (e.g., Li-ion discharge to 2.8V) with minimal dropout voltage. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin - eliminates beat frequencies in multi-converter systems and simplifies EMI filtering. |
| Power-on reset with timing control | POR output asserts low until both outputs settle within ±8.5%, then releases after 65,536 clock cycles - ensures reliable microcontroller boot sequencing. |
Applications
| Cellular Phone Baseband Power | Digital Camera Image Sensor Bias |
|---|---|
|
Use Scenario: Dual-rail supply for baseband processor (1.2V core) and RF transceiver (2.8V I/O) in GSM/UMTS handsets with tight board space constraints. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator delivering sequenced, low-noise power with independent RUN/SS control for power domain management. Use Value: 2.25MHz switching enables 2.2μH inductors ≤1mm height, reducing solution footprint by >40% vs 500kHz alternatives while maintaining >90% efficiency at 300mA/channel. |
Use Scenario: Biasing CMOS image sensor analog front-end (1.8V) and digital interface (2.5V) in compact digital still/video cameras with burst-mode capture. IC Role / Device Role / Timing Role: Dual synchronous buck converter providing stable, low-ripple supplies synchronized to imaging frame timing via MODE/SYNC pin. Use Value: Pulse-skip mode option reduces output ripple to <10mVPK-PK at light loads, preventing noise coupling into analog pixel readout paths. |
| Industrial Handheld Terminal | Automotive Infotainment Display |
|
Use Scenario: Powering ARM Cortex-M7 MCU (1.1V core), DDR3L memory (1.35V), and touchscreen controller (3.3V) in ruggedized warehouse scanners. IC Role / Device Role / Timing Role: High-reliability dual buck regulator operating across –40°C to 125°C ambient with integrated POR for cold-start robustness. Use Value: –40°C to 125°C grade (LTC3407AIDD-2#PBF) ensures uninterrupted operation in unheated outdoor environments where standard 85°C parts would fail. |
Use Scenario: Generating 1.2V GPU core and 1.8V display interface rails in automotive-grade LCD instrument clusters with CAN bus connectivity. IC Role / Device Role / Timing Role: AEC-Q200–compatible dual buck regulator with low EMI profile due to fixed 2.25MHz frequency and optimized layout guidance. Use Value: Exposed PGND pad and θJA = 45°C/W allow direct mounting on metal-shielded enclosures, meeting automotive thermal cycling requirements without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62150ARGTR | Single-channel 1.5A buck; 2.5–6V input; 3MHz switching; no POR or dual outputs. | Requires two ICs for dual-rail designs; lacks integrated power-on reset and independent soft-start. | Select when only one regulated rail is needed and higher peak current (1.5A) is required over dual 800mA capability. |
| RT8070ZSP | Dual-channel 600mA buck; 2.7–5.5V input; 1.5MHz switching; no Burst Mode; 60μA IQ. | Lower efficiency at light loads; no 100% duty-cycle dropout; limited to 85°C operation. | Select for cost-sensitive consumer applications where extended temperature range and ultra-low IQ are not required. |
Compared with TPS62150ARGTR and RT8070ZSP, the LTC3407AIDD-2#PBF uniquely delivers dual independent 800mA outputs with Burst Mode efficiency, –40°C to 125°C operation, and integrated POR in a 3mm × 3mm DFN - making it optimal for thermally constrained, battery-powered dual-rail systems requiring high reliability.
Availability
LTC3407AIDD-2#PBF is available at Aetrix Electronics and suitable for cellular phone baseband power, digital camera image sensor bias, and industrial handheld terminal applications requiring stable component supply across extended temperature ranges.
Supply support for LTC3407AIDD-2#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors with deep expertise in precision DC/DC conversion.
The LTC3407A series was designed specifically for space-constrained, battery-operated portable electronics requiring dual independent high-efficiency step-down regulation with advanced power sequencing and thermal resilience.
FAQ
What is the maximum junction temperature and thermal resistance of the LTC3407AIDD-2#PBF?
The LTC3407AIDD-2#PBF has a maximum junction temperature (TJMAX) of 125°C, with thermal resistance θJA = 45°C/W and θJC = 10°C/W. Its 10-lead 3mm × 3mm DFN package relies on proper soldering of the exposed PGND pad (Pin 11) to a PCB ground plane to achieve specified thermal performance - failure to do so may cause premature thermal shutdown under 800mA load at elevated ambient temperatures.
Does the LTC3407AIDD-2#PBF support independent voltage setting for each output channel?
Yes, the LTC3407AIDD-2#PBF supports fully independent voltage setting via separate feedback networks: VFB1 (Pin 1) sets VOUT1 and VFB2 (Pin 10) sets VOUT2, each referenced to the internal 0.6V bandgap. This allows configurations such as 1.2V/1.8V, 1.8V/2.5V, or 2.5V/3.3V without external components beyond standard resistor dividers.
How does the MODE/SYNC pin affect operation of the LTC3407AIDD-2#PBF?
The MODE/SYNC pin (Pin 6) determines operating mode: tied to VIN enables Burst Mode™ (40μA IQ, higher ripple); tied to GND enables pulse-skip mode (lower ripple, higher IQ); driven by a 2.25MHz external clock synchronizes both channels to that source. The pin must never be left floating, as undefined states may cause erratic switching or failure to start.
Can the LTC3407AIDD-2#PBF operate with input voltage below 2.5V?
No - the LTC3407AIDD-2#PBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V risks undervoltage lockout activation or unstable regulation; the device incorporates UVLO that disables switching when VIN drops below ~1.65V to prevent malfunction.
What is the purpose and behavior of the POR pin on the LTC3407AIDD-2#PBF?
The POR (Pin 8) is an open-drain output that pulls low whenever either VOUT1 or VOUT2 deviates by more than ±8.5% from its setpoint. It remains asserted for 65,536 oscillator cycles (~29ms at 2.25MHz) after both outputs stabilize - providing a clean, debounced reset signal for microcontrollers or FPGAs powered by the LTC3407AIDD-2#PBF outputs.
LTC3407AIDD-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3407AIDD-2#PBF FAQ
1.How can I place an order for LTC3407AIDD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407AIDD-2#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 LTC3407AIDD-2#PBF reliable?
The price and inventory of LTC3407AIDD-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3407AIDD-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3407AIDD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407AIDD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407AIDD-2#PBF?
LTC3407AIDD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407AIDD-2#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 LTC3407AIDD-2#PBF?
For technical support, including LTC3407AIDD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407AIDD-2#PBF requirements.
6.How does Aetrix verify that LTC3407AIDD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3407AIDD-2#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 LTC3407AIDD-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3407AIDD-2#PBF?
All LTC3407AIDD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407AIDD-2#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 LTC3407AIDD-2#PBF part is unused and in its original packaging.
Return procedure for LTC3407AIDD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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