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Analog Devices Inc. LTC3407EMSE-4#TRPBF
- Part No.:
- LTC3407EMSE-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3407EMSE-4#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,957
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Product details
Overview
LTC3407EMSE-4#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous step-down DC/DC converter IC designed for low-power portable systems. It operates from 2.5V to 5.5V input, delivers up to 800mA per channel, switches at a fixed 2.25MHz frequency, and supports adjustable output voltages from 0.6V to 5V - enabling compact power delivery in space-constrained PDA and cellular phone applications.
For engineers reviewing the LTC3407EMSE-4#TRPBF datasheet, LTC3407EMSE-4#TRPBF pinout, LTC3407EMSE-4#TRPBF application, or LTC3407EMSE-4#TRPBF equivalent, key selection considerations include its dual-channel 2.25MHz constant-frequency operation, 40μA quiescent current in active mode, Burst Mode® vs pulse-skipping mode selection via MODE/SYNC, integrated 0.35Ω P-channel and 0.30Ω N-channel MOSFETs, and Power-On Reset with ±8.5% accuracy and 29ms delay.
Technical Context
The LTC3407EMSE-4#TRPBF employs a current-mode, constant-frequency architecture with shared 2.25MHz clocking across both channels and in-phase switching. Its control loop uses an internal 0.6V reference and error amplifier to regulate output voltage via external resistive dividers on VFB1/VFB2 pins.
It integrates two independent synchronous buck regulators with internal 1.2A peak switch current capability, 0.35Ω top (P-MOSFET) and 0.30Ω bottom (N-MOSFET) RDS(ON), and supports dropout operation at 100% duty cycle. The MODE/SYNC pin enables user-selectable Burst Mode® (for ultra-low IQ) or pulse-skipping mode (for low-noise ripple), and also accepts external 2.25MHz synchronization signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and 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 10μF ceramic capacitors, minimizing board area. |
| Output Current per Channel | 800mA continuous - sufficient for core logic, memory, and peripheral rails in handheld devices. |
| Feedback Reference Voltage | 0.6V ±12mV (–40°C to 85°C) - sets precise output regulation point; used with external resistor dividers to program VOUT. |
| Quiescent Current | 40μA (both channels active) - extends battery runtime in always-on subsystems like real-time clocks or sensor interfaces. |
| Power-On Reset Accuracy | ±8.5% threshold with 29ms delay (pulse-skipping mode) - provides reliable system initialization timing for microcontrollers and FPGAs. |
| Shutdown Current | <1μA - ensures negligible battery drain during deep sleep or transport modes. |
Pinout & Package
Package: 10-lead plastic MSOP (MSE), 3mm × 3mm footprint, exposed pad (Pin 11) for thermal and electrical grounding. Compatible with standard reflow profiles (peak body temperature 260°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistor divider on VOUT1; regulates output by comparing divided voltage to 0.6V internal reference. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enable regulator 1; low = shutdown; must be actively driven - floating causes undefined behavior. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling to GND to suppress high-frequency switching noise. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND; layout must minimize trace inductance to reduce EMI and voltage spikes. |
| GND (Pin 5) | Analog ground reference | Not internally connected; serves as shield and return path for feedback and control circuitry - tie directly to PCB ground plane. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN → Burst Mode®; tie to GND → pulse-skipping; apply 2.25MHz square wave → external sync with forced pulse-skipping. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1 but for second regulator; keep SW1/SW2 traces symmetrical and separated to prevent crosstalk. |
| POR (Pin 8) | Open-drain power-on reset output | Pulled low if either VOUT1 or VOUT2 deviates >±8.5%; goes high after 216 clock cycles (~29ms) once both are in regulation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for second regulator; allows staggered startup or dynamic channel disabling for power sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Functionally identical to VFB1; supports independent output voltage programming for dual-rail systems (e.g., 2.5V + 1.8V). |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates need for external Schottky diodes; achieves up to 95% efficiency at 800mA with integrated 0.35Ω/0.30Ω MOSFETs. |
| Burst Mode® operation | Reduces quiescent current to 40μA while maintaining regulation - ideal for standby power in battery-operated devices. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin to eliminate beat frequencies and simplify EMI filtering in multi-regulator systems. |
| 100% duty-cycle dropout operation | Maintains regulation down to VIN ≈ VOUT; P-MOSFET remains fully on, minimizing dropout voltage loss in low-VIN conditions. |
| Power-On Reset with programmable delay | Provides system-level reset signal synchronized to power rail stability; POR release timing depends on operating mode and load. |
Applications
| PDAs / Palmtop PCs | Digital Cameras |
|---|---|
Use Scenario: Powering image sensor, ISP, and LCD bias rails from a single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output buck regulator delivering 2.8V for sensor analog supply and 1.2V for digital core, with coordinated startup via RUN1/RUN2. Use Value: 2.25MHz switching enables <3mm-height magnetics; 40μA IQ extends capture-ready standby time beyond 72 hours. |
Use Scenario: Supplying CMOS image sensor, flash controller, and SD card interface in compact camera modules. IC Role / Device Role / Timing Role: Provides 3.3V for I/O and 1.8V for sensor logic; POR output sequences FPGA configuration after power stabilization. Use Value: Burst Mode® maintains >85% efficiency at 10mA sensor bias current; MODE/SYNC pin allows noise-sensitive analog sections to force pulse-skipping mode. |
| Cellular Phones | Wireless Modems |
Use Scenario: Generating application processor core (1.1V) and memory I/O (1.8V) supplies in LTE handset designs. IC Role / Device Role / Timing Role: Dual-channel regulator with independent RUN pins enables dynamic voltage scaling (DVS) and rapid power-state transitions. Use Value: 0.35Ω RDS(ON) limits conduction loss at 800mA; 2.25MHz operation avoids AM radio band interference (0.53–1.71MHz). |
Use Scenario: Powering baseband processor, RF transceiver, and USB PHY in 4G/LTE CPE modems. IC Role / Device Role / Timing Role: Delivers 1.2V core and 3.3V interface rails; POR signal resets modem firmware only after both outputs reach ±8.5% regulation. Use Value: Synchronization capability aligns switching edges across multiple LTC3407EMSE-4#TRPBF units to reduce aggregate input ripple and simplify bulk capacitor sizing. |
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 |
|---|---|---|---|
| TPS62400DRVR | 2.25MHz fixed frequency, but only 600mA per channel; uses external compensation; no integrated POR output. | Lacks power-good sequencing signal; requires external reset IC for MCU coordination; lower current limit restricts use in high-performance processors. | Select when cost sensitivity outweighs need for POR and higher current; verify loop stability with external RC network. |
| MAX17504ATP+ | Adjustable 200kHz–2.2MHz frequency; 1A per channel; includes spread-spectrum modulation; no Burst Mode®. | Higher peak current supports transient-heavy loads; spread spectrum reduces EMI peaks; lacks ultra-low-IQ mode for long standby. | Prefer for industrial or automotive environments where EMI compliance is critical and battery life is secondary to load robustness. |
Compared with TPS62400DRVR and MAX17504ATP+, the LTC3407EMSE-4#TRPBF uniquely combines dual 800mA channels, integrated POR, 40μA quiescent current with Burst Mode®, and guaranteed 2.25MHz operation - making it optimal for consumer portable devices requiring compact size, long battery life, and reliable power sequencing.
Availability
LTC3407EMSE-4#TRPBF is available at Aetrix Electronics and suitable for PDAs, digital cameras, and cellular phones requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support for consumer electronics programs.
Supply support for LTC3407EMSE-4#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 high-performance power management portfolio with rigorous characterization and reliability testing.
The LTC3407EMSE-4#TRPBF belongs to Linear's precision monolithic DC/DC converter family, engineered specifically for space- and power-constrained portable electronics where efficiency, small solution size, and accurate power sequencing are critical.
FAQ
What is the maximum supported output current per channel for the LTC3407EMSE-4#TRPBF?
The LTC3407EMSE-4#TRPBF supports up to 800mA continuous output current per channel under typical thermal conditions (TA ≤ 85°C, θJA = 45°C/W). This rating assumes proper PCB layout with the exposed pad soldered to a thermal ground plane. Peak switch current is specified at 1.2A, allowing margin for transient loads and inductor saturation limits.
Does the LTC3407EMSE-4#TRPBF require external Schottky diodes?
No, the LTC3407EMSE-4#TRPBF does not require external Schottky diodes. It integrates synchronous rectification using internal P-channel (0.35Ω) and N-channel (0.30Ω) MOSFETs for each channel, eliminating reverse recovery losses and improving efficiency - especially at light loads and high switching frequencies.
How does the MODE/SYNC pin affect operation of the LTC3407EMSE-4#TRPBF?
The MODE/SYNC pin on the LTC3407EMSE-4#TRPBF serves three functions: tying it to VIN selects Burst Mode® (ultra-low IQ), tying it to GND selects pulse-skipping mode (low-noise ripple), and applying a 2.25MHz external clock forces pulse-skipping with synchronized switching - enabling deterministic EMI reduction in multi-rail systems.
What is the purpose and behavior of the POR pin on the LTC3407EMSE-4#TRPBF?
The POR (Power-On Reset) pin on the LTC3407EMSE-4#TRPBF is an open-drain output that pulls low whenever either output voltage deviates beyond ±8.5% of its target. Once both channels stabilize within tolerance, a 216-cycle timer starts; POR releases high after ~29ms in pulse-skipping mode - providing a clean, sequenced reset signal for downstream logic.
Can the LTC3407EMSE-4#TRPBF operate with input voltages below 2.5V?
No, the LTC3407EMSE-4#TRPBF has a minimum specified input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this level risks failure to start, unstable regulation, or violation of internal UVLO thresholds - which are set to ~1.65V but do not guarantee functional behavior below 2.5V.
LTC3407EMSE-4#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:
- 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3407EMSE-4#TRPBF FAQ
1.How can I place an order for LTC3407EMSE-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407EMSE-4#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 LTC3407EMSE-4#TRPBF reliable?
The price and inventory of LTC3407EMSE-4#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3407EMSE-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3407EMSE-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407EMSE-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407EMSE-4#TRPBF?
LTC3407EMSE-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407EMSE-4#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 LTC3407EMSE-4#TRPBF?
For technical support, including LTC3407EMSE-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407EMSE-4#TRPBF requirements.
6.How does Aetrix verify that LTC3407EMSE-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3407EMSE-4#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 LTC3407EMSE-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3407EMSE-4#TRPBF?
All LTC3407EMSE-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407EMSE-4#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 LTC3407EMSE-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC3407EMSE-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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