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Analog Devices Inc. LTC3407EMSE-4#PBF
- Part No.:
- LTC3407EMSE-4#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3407EMSE-4#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,896
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Product details
Overview
LTC3407EMSE-4#PBF 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 800mA per channel, switches at a fixed 2.25MHz frequency, and supports adjustable output voltages from 0.6V to 5V - enabling compact designs in PDAs, digital cameras, and cellular handsets.
For engineers reviewing the LTC3407EMSE-4#PBF datasheet, LTC3407EMSE-4#PBF pinout, LTC3407EMSE-4#PBF application, or LTC3407EMSE-4#PBF equivalent, key selection criteria include its dual-channel 2.25MHz operation, 40μA quiescent current in active mode, Burst Mode® vs pulse-skipping mode selection, 0.35Ω internal P-channel switch RDS(ON), and integrated power-on reset with ±8.5% threshold.
Technical Context
The LTC3407EMSE-4#PBF employs a constant-frequency, current-mode control architecture with shared 2.25MHz clocking across both channels and in-phase switching. Its error amplifier compares feedback voltage against a 0.6V reference, modulating peak inductor current via an internally compensated ITH node to maintain regulation.
It features dual independent RUN pins for channel enable/disable, a multifunction MODE/SYNC pin supporting Burst Mode® (high efficiency at light load), pulse-skipping mode (low-noise operation), and external oscillator synchronization. The POR output asserts low when either channel deviates >±8.5% from target and releases after 216 clock cycles (~29ms in pulse-skipping 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 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 for ultra-thin portable layouts. |
| Output Current per Channel | 800mA continuous - sufficient for core logic, memory, and interface ICs in handheld devices. |
| Feedback Reference Voltage | 0.6V ±12mV (–40°C to 85°C) - sets output accuracy and enables precise 1.8V, 2.5V, or 3.3V generation with standard resistor dividers. |
| Quiescent Current | 40μA (both channels active) - extends battery runtime in always-on subsystems like real-time clocks or sensor interfaces. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep or storage modes. |
| Power-On Reset Threshold | ±8.5% output deviation - provides reliable system initialization timing without external supervisor ICs. |
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, lead temp 300°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider on VOUT1; regulates output by comparing to 0.6V internal reference. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enable; 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 minimize high-frequency noise coupling. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; layout critical for EMI and efficiency. |
| GND (Pin 5) | Analog ground reference | Not internally connected; must tie directly to PCB ground plane under exposed pad for signal integrity. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Ground = pulse-skipping; VIN = Burst Mode®; external 2.25MHz clock = forced sync + pulse-skipping. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; independent inductor connection required for each channel. |
| POR (Pin 8) | Open-drain power-on reset | Pulled low if either VOUT outside ±8.5%; releases after ~29ms once both outputs stabilize. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for second regulator; allows staggered power sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1; supports independent output voltage programming per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous switching | Eliminates external Schottky diodes; achieves up to 95% efficiency with integrated 0.35Ω P-MOS and 0.30Ω N-MOS switches. |
| Burst Mode® operation | Reduces quiescent current to 40μA while maintaining regulation - ideal for standby power domains in battery-powered systems. |
| 100% duty-cycle dropout | Enables operation down to VIN ≈ VOUT; P-MOS remains fully enhanced, minimizing dropout voltage loss at low input. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin to eliminate beat frequencies in multi-regulator systems. |
| Integrated power-on reset | Single POR output monitors both channels; eliminates need for discrete supervisor IC and reduces BOM count. |
Applications
| Mobile Baseband Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Powering ARM-based application processors and DDR memory in smartphones with tight height constraints. IC Role / Device Role / Timing Role: Dual-output buck regulator delivering 1.2V/1.8V simultaneously from a single Li-ion cell (3.0–4.2V). Use Value: 2.25MHz switching enables ≤1mm-profile inductors and eliminates need for bulky input/output capacitors - critical for <8mm-thick form factors. |
Use Scenario: Supplying image sensor, ISP, and LCD driver in compact digital cameras. IC Role / Device Role / Timing Role: Independent dual-channel regulation providing 2.8V for sensor analog circuitry and 1.8V for digital logic. Use Value: Burst Mode® extends battery life during viewfinder operation; POR ensures clean boot sequence before sensor initialization. |
| Wireless Modem RF Front-End | PDA Application Processor Rail |
Use Scenario: Generating stable 3.3V and 1.8V supplies for LTE/Wi-Fi transceivers and baseband ICs in portable hotspots. IC Role / Device Role / Timing Role: Low-noise pulse-skipping mode selected via MODE/SYNC pin to minimize switching interference on sensitive RF receive paths. Use Value: Fixed 2.25MHz frequency avoids conflict with common IF bands; low RDS(ON) minimizes thermal rise in sealed enclosures. |
Use Scenario: Powering OMAP or PXA processors and associated peripherals in enterprise PDAs. IC Role / Device Role / Timing Role: Dual buck supplying 1.2V CPU core and 3.3V I/O rail with independent RUN pin control for dynamic voltage scaling. Use Value: 40μA quiescent current preserves battery during long idle periods; MSOP package simplifies routing in dense 4-layer PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | Single-channel, 3MHz, 600mA; no POR or MODE pin; lower IQ (22μA) but no Burst Mode®. | Lacks dual output and power-good signaling - requires two devices and external monitoring for equivalent functionality. | Select only if single-rail design suffices and highest light-load efficiency is prioritized over integration. |
| RT8059ZSP | Dual-channel, 1.5MHz, 600mA; no integrated POR; uses external resistor for mode selection instead of MODE/SYNC pin. | Requires external supervisor IC for reset; lower switching frequency demands larger magnetics - increases board area. | Choose when cost sensitivity outweighs size constraints and POR is implemented elsewhere in system. |
Compared with TPS62231DRYT and RT8059ZSP, the LTC3407EMSE-4#PBF uniquely integrates dual 800mA channels, Burst Mode®, pulse-skipping mode, and POR in a single 3mm × 3mm MSOP - reducing component count, PCB area, and system-level validation effort for space-constrained portable designs.
Availability
LTC3407EMSE-4#PBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera core supply, and wireless modem RF front-end applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3407EMSE-4#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 power management portfolio. Linear pioneered high-efficiency, high-frequency monolithic DC/DC converters for portable electronics.
The LTC3407EMSE-4#PBF belongs to Linear's ultra-thin synchronous buck regulator family, designed specifically for battery-powered handheld devices where board height, light-load efficiency, and integration density are critical.
FAQ
What is the maximum output current per channel for the LTC3407EMSE-4#PBF?
The LTC3407EMSE-4#PBF delivers up to 800mA continuously per channel under typical conditions (TA = 25°C, VIN = 3.6V). Peak switch current limit is 1.2A (typ), but sustained output is limited by thermal dissipation in the MSOP package. Derating is required above 85°C ambient or with poor PCB copper area.
Does the LTC3407EMSE-4#PBF require external Schottky diodes?
No, the LTC3407EMSE-4#PBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs (0.35Ω and 0.30Ω RDS(ON), respectively) per channel, eliminating conduction losses and heat generation associated with external diodes - a key factor in its up to 95% efficiency.
How does the MODE/SYNC pin affect operation of the LTC3407EMSE-4#PBF?
The MODE/SYNC pin on the LTC3407EMSE-4#PBF selects between Burst Mode® (pin tied to VIN) for lowest quiescent current, pulse-skipping mode (pin grounded) for lowest output ripple, or external synchronization (2.25MHz clock applied) which forces pulse-skipping. Floating this pin is prohibited and causes undefined behavior.
What is the purpose of the POR pin on the LTC3407EMSE-4#PBF?
The POR (Power-On Reset) pin on the LTC3407EMSE-4#PBF is an open-drain output that remains low until both output voltages are within ±8.5% of their programmed values for 216 clock cycles (~29ms in pulse-skipping mode). It provides system-level reset signaling without requiring a separate supervisor IC.
Can the LTC3407EMSE-4#PBF operate with input voltage below 2.5V?
No, the LTC3407EMSE-4#PBF has a specified minimum input voltage of 2.5V. Below this, undervoltage lockout disables operation. The device shuts down when VIN drops below ~1.65V to prevent unstable regulation or erratic switching behavior - ensuring predictable power sequencing in battery-powered systems.
LTC3407EMSE-4#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3407EMSE-4#PBF FAQ
1.How can I place an order for LTC3407EMSE-4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407EMSE-4#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 LTC3407EMSE-4#PBF reliable?
The price and inventory of LTC3407EMSE-4#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3407EMSE-4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407EMSE-4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407EMSE-4#PBF?
LTC3407EMSE-4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407EMSE-4#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 LTC3407EMSE-4#PBF?
For technical support, including LTC3407EMSE-4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407EMSE-4#PBF requirements.
6.How does Aetrix verify that LTC3407EMSE-4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3407EMSE-4#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 LTC3407EMSE-4#PBF meets industry standards.
7.What is the process for return or replacement of LTC3407EMSE-4#PBF?
All LTC3407EMSE-4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407EMSE-4#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 LTC3407EMSE-4#PBF part is unused and in its original packaging.
Return procedure for LTC3407EMSE-4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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