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Analog Devices Inc. LTC3407AIDD#TRPBF
- Part No.:
- LTC3407AIDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407AIDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,218
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Product details
Overview
LTC3407AIDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC converter optimized for low-power portable systems. It operates from 2.5V to 5.5V input, delivers up to 600mA per channel, switches at a fixed 1.5MHz frequency, and supports adjustable output voltages from 0.6V to 5V - enabling compact designs for battery-powered PDAs, digital cameras, and cellular handsets.
For engineers reviewing the LTC3407AIDD#TRPBF datasheet, LTC3407AIDD#TRPBF pinout, LTC3407AIDD#TRPBF application, or LTC3407AIDD#TRPBF equivalent, key selection criteria include its dual-channel 1.5MHz current-mode architecture, Burst Mode® vs Pulse Skip Mode trade-off capability, 40μA quiescent current in active mode, integrated 0.35Ω P-channel / 0.30Ω N-channel MOSFETs, and support for external synchronization and soft-start.
Technical Context
The LTC3407AIDD#TRPBF implements a constant-frequency current-mode control architecture with shared 1.5MHz oscillator across both channels, enabling precise timing alignment and simplified EMI filtering. Each channel features independent RUN/SS pins for enable/soft-start control and VFB pins referenced to a trimmed 0.6V internal bandgap.
Its MODE/SYNC pin serves triple function: selecting Burst Mode® (for peak efficiency at light loads, IQ = 40μA) or Pulse Skip Mode (for lowest output ripple), and accepting external clock signals for synchronization. The POR pin provides open-drain power-on reset with ±8.5% voltage tolerance and 65,536-cycle (≈44ms) delay in Pulse Skip Mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and 3.3V/5V rail inputs without pre-regulation. |
| Switching Frequency | 1.5MHz (typ) - enables use of sub-3mm-height inductors and 10μF ceramic output capacitors. |
| Output Current per Channel | 600mA continuous - sufficient for core logic rails (e.g., 1.8V/2.5V) in handheld devices. |
| Feedback Reference Voltage | 0.6V ±1.2% (–40°C to 125°C) - sets output accuracy and enables precise resistor-divider programming. |
| Quiescent Current | 40μA total (both channels) - extends battery runtime in standby/sleep states. |
| Shutdown Current | <1μA - ensures negligible drain during system off-state. |
| Internal Switch RDS(ON) | 0.35Ω (P-ch top), 0.30Ω (N-ch bottom) - eliminates need for external Schottky diodes and improves full-load efficiency. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = PGND). Designed for high thermal performance in space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider; regulates VOUT1 to 0.6V reference - determines output voltage via VOUT1 = 0.6V × (1 + R2/R1). |
| RUN/SS1 (Pin 2) | Channel 1 enable & soft-start | High = enable; low = shutdown; RC network on this pin controls startup slew rate and inrush current. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling to minimize switching noise coupling. |
| 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 ground reference | Return path for feedback, error amp, and control circuitry - separate from PGND but tied at single point. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tied to VIN = Burst Mode®; tied to GND = Pulse Skip Mode; driven by external 1.5MHz clock = synchronized operation. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1 - requires symmetric layout for balanced thermal and EMI performance. |
| POR (Pin 8) | Power-on reset output | Open-drain signal pulled low if either VOUT deviates >±8.5%; releases after 65,536 clock cycles when both are in regulation. |
| RUN/SS2 (Pin 9) | Channel 2 enable & soft-start | Independent control for second regulator - allows staggered startup or selective channel disable. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1 - enables independent output voltage setting for dual-rail applications (e.g., 1.8V + 2.5V). |
| PGND (Pin 11) | Power ground / thermal pad | Exposed pad must be soldered to solid GND plane - primary thermal path and return for high-current switch paths. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 1.5MHz regulators | Enables compact dual-rail power supplies with matched transient response and no inter-channel crosstalk. |
| Burst Mode® operation | Achieves up to 96% efficiency at 1mA load while maintaining 40μA quiescent current - critical for always-on subsystems. |
| Integrated 0.35Ω/0.30Ω MOSFETs | Eliminates external diodes and reduces BOM count; delivers >90% efficiency at 600mA with 2.2μH inductors. |
| External synchronization capability | Allows multiple LTC3407AIDD#TRPBF units or other converters to operate at same frequency - simplifies EMI filter design. |
| Programmable soft-start per channel | Prevents input voltage droop and output overshoot during power-up - essential for FPGA, DSP, and multi-core SoC sequencing. |
Applications
| PDAs & Palmtop PCs | Digital Cameras |
|---|---|
Use Scenario: Powering ARM-based application processors and image signal processors from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-channel step-down regulator generating 1.2V core and 2.8V I/O rails with independent enable control. Use Value: 1.5MHz switching allows use of 2.2μH, 1mm-height inductors and 10μF ceramic capacitors - reducing board area by >40% vs lower-frequency alternatives. |
Use Scenario: Supplying CCD/CMOS sensor bias, analog front-end, and SD card interface in compact camera modules. IC Role / Device Role / Timing Role: High-efficiency dual regulator delivering 3.3V (sensor) and 1.8V (memory controller) with low-noise Pulse Skip Mode during image capture. Use Value: 35mVP-P output ripple in Pulse Skip Mode ensures clean analog supply - preventing fixed-pattern noise in captured images. |
| Cellular Handsets | Wireless Modems |
Use Scenario: Providing RF transceiver VCO, baseband processor, and display backlight power in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Dual buck converter operating in Burst Mode® during standby to extend talk time; synchronized to baseband clock during transmission. Use Value: 40μA quiescent current per channel doubles standby battery life vs comparable 3MHz parts lacking Burst Mode® optimization. |
Use Scenario: Generating 1.5V PHY, 3.3V USB interface, and 2.5V RF amplifier rails in LTE/DSL modems with thermal constraints. IC Role / Device Role / Timing Role: Thermally enhanced DFN package with exposed PGND pad dissipates >1.2W at 85°C ambient - avoids derating in sealed enclosures. Use Value: 0.35Ω/0.30Ω RDS(ON) minimizes conduction loss at 600mA - maintains >92% efficiency even at 2.5V input (low battery condition). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62125DSCR | Single-channel, 3MHz fixed-frequency, 0.6V–5.5V output, 300mA max - lacks second channel and Burst Mode®. | Suitable only for single-rail systems; requires two ICs for dual outputs - increases layout area and BOM cost. | Select only when dual-channel integration is unnecessary and higher switching frequency is prioritized for ultra-small inductors. |
| RT8059GJ6 | Dual-channel, 1.5MHz, 600mA/channel, but uses external compensation and lacks POR, SYNC, and soft-start per channel. | No built-in power-on reset or synchronization - requires additional discrete components for system-level timing coordination. | Choose when cost sensitivity outweighs feature completeness and board space is less constrained than in portable designs. |
Compared with TPS62125DSCR and RT8059GJ6, the LTC3407AIDD#TRPBF uniquely integrates dual independent regulators with per-channel soft-start, POR, and selectable low-power modes in a thermally optimized 3mm × 3mm DFN - making it the only option that meets full functional and footprint requirements for next-generation portable electronics.
Availability
LTC3407AIDD#TRPBF is available at Aetrix Electronics and suitable for PDAs, digital cameras, and cellular handsets requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range (–40°C to 125°C).
Supply support for LTC3407AIDD#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3407AIDD#TRPBF belongs to Linear's LTC® family of high-efficiency, high-frequency DC/DC converters designed specifically for space- and battery-constrained portable electronics where thermal density and light-load efficiency are critical.
FAQ
What is the operating temperature range for the LTC3407AIDD#TRPBF?
The LTC3407AIDD#TRPBF is rated for –40°C to 125°C junction temperature and is specified over the full industrial temperature range. Its absolute maximum ratings include TJMAX = 125°C, θJA = 45°C/W, and θJC = 10°C/W - confirming suitability for thermally demanding environments such as enclosed modems or automotive infotainment displays. The "I" grade suffix explicitly denotes this extended range.
Does the LTC3407AIDD#TRPBF require external Schottky diodes?
No, the LTC3407AIDD#TRPBF does not require external Schottky diodes. It integrates synchronous P-channel (0.35Ω) and N-channel (0.30Ω) MOSFETs per channel, eliminating reverse recovery losses and enabling efficiencies up to 96%. This internal synchronous rectification is confirmed in the device description, features list, and typical application schematic - removing BOM cost and layout complexity.
How does Burst Mode® operation affect the LTC3407AIDD#TRPBF's output ripple?
In Burst Mode®, the LTC3407AIDD#TRPBF achieves ultralow quiescent current (40μA) but produces higher output ripple - specified at 35mVP-P under typical conditions. This occurs because the regulator pulses intermittently rather than switching continuously. For applications requiring minimal ripple (e.g., camera sensors), Pulse Skip Mode - selected by grounding MODE/SYNC - reduces ripple significantly at the expense of higher light-load current.
Can the LTC3407AIDD#TRPBF synchronize to an external clock?
Yes, the LTC3407AIDD#TRPBF can synchronize to an external 1.5MHz clock applied to the MODE/SYNC pin (Pin 6). During synchronization, the device automatically enters Pulse Skip Mode and aligns its top-switch turn-on edge to the rising edge of the external clock. This capability is documented in the PIN FUNCTIONS section and TYPICAL PERFORMANCE CHARACTERISTICS - enabling deterministic EMI reduction in multi-converter systems.
What is the purpose of the POR pin on the LTC3407AIDD#TRPBF?
The POR (Power-On Reset) pin on the LTC3407AIDD#TRPBF is an open-drain output that remains low until both regulated outputs are within ±8.5% of their target voltages for 65,536 clock cycles (≈44ms in Pulse Skip Mode). It provides system-level reset signaling for microcontrollers or FPGAs - ensuring reliable boot sequencing. The POR behavior is fully characterized in the ELECTRICAL CHARACTERISTICS table and APPLICATIONS INFORMATION section.
LTC3407AIDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 600mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3407AIDD#TRPBF FAQ
1.How can I place an order for LTC3407AIDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407AIDD#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 LTC3407AIDD#TRPBF reliable?
The price and inventory of LTC3407AIDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3407AIDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3407AIDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407AIDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407AIDD#TRPBF?
LTC3407AIDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407AIDD#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 LTC3407AIDD#TRPBF?
For technical support, including LTC3407AIDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407AIDD#TRPBF requirements.
6.How does Aetrix verify that LTC3407AIDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3407AIDD#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 LTC3407AIDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3407AIDD#TRPBF?
All LTC3407AIDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407AIDD#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 LTC3407AIDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3407AIDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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