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Analog Devices Inc. LTC3407AIMSE#TRPBF
- Part No.:
- LTC3407AIMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3407AIMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,580
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Product details
Overview
LTC3407AIMSE#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 with 1mm-height inductors and ceramic capacitors in handheld devices like digital cameras and cellular phones.
For engineers reviewing the LTC3407AIMSE#TRPBF datasheet, LTC3407AIMSE#TRPBF pinout, LTC3407AIMSE#TRPBF application, or LTC3407AIMSE#TRPBF equivalent, key selection considerations include its dual-output synchronous architecture, 40μA quiescent current in Burst Mode, 0.35Ω internal P-channel MOSFET RDS(ON), ±8.5% POR threshold, and thermally enhanced 10-lead MSOP package with exposed PGND pad.
Technical Context
The LTC3407AIMSE#TRPBF uses a constant-frequency current-mode control architecture with shared 1.5MHz clocking across both channels, enabling precise in-phase operation and stable transient response. Its dual error amplifiers compare feedback voltages against a 0.6V reference, while overvoltage/undervoltage comparators drive the open-drain POR output based on ±8.5% regulation window.
Mode selection via MODE/SYNC pin enables either Burst Mode (for peak light-load efficiency of 96% at 1mA) or Pulse Skip Mode (for lowest output ripple: 35mVP-P), with automatic transition between continuous conduction and low-current modes. Dropout operation maintains 100% duty cycle using the internal P-MOSFET, supported by thermal metrics θJA = 45°C/W and TJMAX = 125°C.
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 external regulators. |
| Switching Frequency | 1.5MHz (typ) - enables use of sub-1mm height inductors and small ceramic capacitors for space-constrained PCBs. |
| Output Current per Channel | 600mA (max) - sufficient for powering core logic, memory, and peripherals in portable electronics. |
| Feedback Reference Voltage | 0.6V (±2%) - sets output voltage via external resistor divider; enables precise 0.6V–5V adjustment with <0.5% load regulation. |
| Quiescent Current | 40μA (Burst Mode, both channels active) - extends battery runtime in always-on or low-duty-cycle applications. |
| Shutdown Current | <1μA - ensures minimal battery drain during system sleep or power-off states. |
| Thermal Rating | TA = –40°C to +125°C (industrial grade) - validated for extended temperature operation in demanding embedded environments. |
Pinout & Package
Package: 10-lead plastic MSOP (MSE) with exposed power ground pad (Pin 11), 3mm × 3mm footprint, 1.1mm max height. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| 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 accuracy and loop stability. |
| 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 limiting. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling to minimize high-frequency noise and supply impedance. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND - critical for EMI layout and thermal management of high di/dt paths. |
| GND (Pin 5) | Analog and power ground | Common return for feedback, control, and input/output capacitors - must be tied to exposed PGND pad (Pin 11). |
| MODE/SYNC (Pin 6) | Mode selection & sync input | High = Burst Mode; low = Pulse Skip Mode; external 1.5MHz clock accepted for synchronization across multiple ICs. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; requires separate inductor and layout isolation to prevent cross-talk and coupling. |
| POR (Pin 8) | Power-on reset output | Open-drain signal pulled low if either output deviates >±8.5%; releases after 65,536 clock cycles (~44ms in Pulse Skip). |
| RUN/SS2 (Pin 9) | Channel 2 enable & soft-start | Independent control of second regulator - enables staggered startup or selective channel disable for power sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Independent regulation loop; allows different output voltages (e.g., 1.8V + 2.5V) with matched accuracy and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates need for external Schottky diodes; achieves up to 96% efficiency with integrated 0.35Ω P-MOSFET and 0.30Ω N-MOSFET switches. |
| Burst Mode® operation | Reduces quiescent current to 40μA while maintaining regulation - ideal for battery-powered standby and sensor wake-up intervals. |
| Externally synchronizable oscillator | Accepts 1.5MHz external clock on MODE/SYNC pin to eliminate beat frequencies and reduce EMI in multi-regulator systems. |
| Power-On Reset with programmable delay | Provides system-level reset assertion until both outputs stabilize within ±8.5%, with delay determined by internal 65,536-cycle counter. |
| 100% duty cycle dropout mode | Maintains regulation as input drops to output level by fully enhancing P-MOSFET - preserves functionality during brown-out conditions. |
Applications
| Digital Camera Power Management | Cellular Phone Baseband Supply |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.8V) and ISP/FPGA core (2.5V) in compact camera modules with strict height constraints. IC Role / Device Role / Timing Role: Dual synchronous step-down regulator providing independent, low-noise, sequenced outputs with POR coordination. Use Value: Enables use of 1mm-height inductors and eliminates discrete diodes - reducing BOM count and PCB area by >30% vs. legacy solutions. |
Use Scenario: Powering application processor I/O (1.8V) and RF transceiver (2.8V) in LTE smartphones with dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency dual buck delivering fast transient response and ultra-low IQ during deep-sleep states. Use Value: Extends talk time by 12% vs. non-Burst Mode converters due to 40μA quiescent current and 96% peak efficiency at 10mA loads. |
| Wireless Modem Core Logic | PDA/Palmtop System Rail Generation |
Use Scenario: Generating 1.2V core and 3.3V interface rails for DSL/wireless modems operating from 5V USB or wall adapter input. IC Role / Device Role / Timing Role: Dual adjustable buck with external sync capability to align switching edges and suppress conducted EMI. Use Value: Meets EN55022 Class B emissions limits without shielding, thanks to 1.5MHz fixed frequency and clean Burst Mode waveform. |
Use Scenario: Compact dual-output supply for ARM-based PDAs requiring 1.5V CPU core and 2.5V memory I/O from single Li-ion cell. IC Role / Device Role / Timing Role: Thermally robust dual regulator in MSOP package with exposed PGND pad for passive cooling in sealed enclosures. Use Value: Sustains full 600mA/channel output at 125°C ambient - validated for industrial PDA deployments without forced airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62125DSCR | Single-output, 3MHz switching, 0.6V–5.5V adjustable, 300mA max, 3.5μA IQ - lacks second channel and POR output. | Not suitable for dual-rail systems; requires two ICs to match LTC3407AIMSE#TRPBF functionality - increases board area and BOM cost. | Select only when single-rail, ultra-low-IQ (<5μA) operation is prioritized over integration and sequencing capability. |
| RT8059NGQW | Dual-output, 2MHz, 0.6V–5.5V, 600mA/channel, no POR, 2.5μA IQ in shutdown - no Burst Mode, higher light-load ripple. | Missing power-good signaling and ±8.5% POR window; unsuitable for systems requiring coordinated reset assertion on dual-rail stabilization. | Consider only for cost-sensitive consumer applications where POR is implemented externally and EMI is less critical. |
Compared with TPS62125DSCR and RT8059NGQW, the LTC3407AIMSE#TRPBF uniquely integrates dual independent regulators, Burst Mode efficiency, open-drain POR, and thermal-grade packaging - making it the only option supporting true dual-rail sequencing and industrial temperature operation in a single 10-pin MSOP.
Availability
LTC3407AIMSE#TRPBF is available at Aetrix Electronics and suitable for digital camera power management, cellular phone baseband supply, wireless modem core logic, and PDA/palmtop system rail generation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3407AIMSE#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 portfolio of high-performance analog and power management ICs. Linear's legacy design ethos emphasizes precision, efficiency, and ruggedness in power conversion.
The LTC3407AIMSE#TRPBF belongs to Linear's LTC3407 family of dual synchronous step-down regulators, engineered specifically for space- and battery-constrained portable electronics requiring dual independent rails, low quiescent current, and robust thermal performance.
FAQ
What is the maximum output current per channel for the LTC3407AIMSE#TRPBF?
The LTC3407AIMSE#TRPBF delivers up to 600mA per channel continuously under typical thermal conditions (TA ≤ 85°C, proper PCB copper pour). At 125°C ambient, derating applies per thermal calculations using θJA = 45°C/W. Peak switch current limit is 1A (min), ensuring reliable operation even during transient overload events. The LTC3407AIMSE#TRPBF maintains regulation down to 0.6V output with full current capability.
Does the LTC3407AIMSE#TRPBF support external frequency synchronization?
Yes, the LTC3407AIMSE#TRPBF supports external synchronization via the MODE/SYNC pin (Pin 6). Applying a 1.5MHz square wave to this pin locks both channels to the external clock and forces Pulse Skip Mode operation. This feature eliminates beat frequencies in multi-regulator systems and reduces EMI by aligning switching edges - a capability not present in many competing dual-buck ICs. The LTC3407AIMSE#TRPBF maintains full regulation and transient response during sync operation.
How does Burst Mode® operation affect output voltage ripple on the LTC3407AIMSE#TRPBF?
In Burst Mode®, the LTC3407AIMSE#TRPBF reduces switching activity at light loads to minimize gate charge losses, achieving 40μA quiescent current. This results in higher output voltage ripple - specified at 35mVP-P - due to intermittent energy delivery. Ripple remains bounded and predictable, with no subharmonic oscillation. For applications requiring lower ripple, Pulse Skip Mode (selected by grounding MODE/SYNC) maintains constant 1.5MHz switching and reduces ripple to <10mVP-P. The LTC3407AIMSE#TRPBF's dual-mode flexibility allows trade-offs between efficiency and noise per system requirement.
What is the purpose of the POR pin on the LTC3407AIMSE#TRPBF?
The POR (Power-On Reset) pin on the LTC3407AIMSE#TRPBF is an open-drain output that asserts low when either regulated output deviates beyond ±8.5% of its target voltage. It releases high after 65,536 internal clock cycles (~44ms in Pulse Skip Mode) once both outputs are in regulation. This provides a system-level reset signal synchronized to power rail stability - critical for microcontrollers and FPGAs. If one channel is disabled, POR remains low; tying POR to MODE/SYNC forces Pulse Skip Mode during reset to avoid timing uncertainty. The LTC3407AIMSE#TRPBF's POR eliminates need for external reset ICs in dual-rail systems.
Can the LTC3407AIMSE#TRPBF operate with input voltage below 2.5V?
No, the LTC3407AIMSE#TRPBF has a minimum specified input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V risks undervoltage lockout activation (UVLO trips near 1.65V), unregulated output, or undefined behavior. While the device may briefly function down to ~2.2V in lab tests, Analog Devices guarantees performance only within 2.5V–5.5V. For sub-2.5V inputs, consider the LTC3522 (1.8V–5.5V) or LTC3604 (1.6V–5.5V) - neither of which are drop-in replacements for the LTC3407AIMSE#TRPBF.
LTC3407AIMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3407AIMSE#TRPBF FAQ
1.How can I place an order for LTC3407AIMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407AIMSE#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 LTC3407AIMSE#TRPBF reliable?
The price and inventory of LTC3407AIMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3407AIMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3407AIMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407AIMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407AIMSE#TRPBF?
LTC3407AIMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407AIMSE#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 LTC3407AIMSE#TRPBF?
For technical support, including LTC3407AIMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407AIMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3407AIMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3407AIMSE#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 LTC3407AIMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3407AIMSE#TRPBF?
All LTC3407AIMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407AIMSE#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 LTC3407AIMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3407AIMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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