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Analog Devices Inc. LTC3407AEMSE-2#PBF
- Part No.:
- LTC3407AEMSE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3407AEMSE-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:561
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Product details
Overview
LTC3407AEMSE-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 delivers up to 800mA per channel from a 2.5V–5.5V input, operates at a fixed 2.25MHz switching frequency, features internal 0.35Ω P-channel and 0.30Ω N-channel MOSFETs, and supports adjustable output voltages from 0.6V to 5V - enabling compact power solutions in PDAs, digital cameras, and cellular handsets.
For engineers reviewing the LTC3407AEMSE-2#PBF datasheet, LTC3407AEMSE-2#PBF pinout, LTC3407AEMSE-2#PBF application, or LTC3407AEMSE-2#PBF equivalent, key selection considerations include its Burst Mode™ efficiency (95% peak), 40μA quiescent current in active mode, 100% duty-cycle dropout operation, externally synchronizable oscillator, and dual independent soft-start via RUN/SS1 and RUN/SS2 pins.
Technical Context
The LTC3407AEMSE-2#PBF employs a constant-frequency current-mode control architecture with shared 2.25MHz clocking across both channels, ensuring in-phase switching and predictable EMI behavior. Its MODE/SYNC pin selects between Burst Mode™ (optimized for light-load efficiency, IQ = 40μA) and Pulse Skip Mode (minimizing output ripple at light loads), while internal overvoltage/undervoltage comparators feed a common open-drain POR output.
Each channel uses a dedicated error amplifier comparing VFB to a precision 0.6V reference, controlling peak inductor current via ITH voltage. In dropout, the P-channel top switch remains fully on (100% duty cycle), maintaining regulation down to VIN ≈ VOUT + IOUT × RDS(ON), with thermal derating required due to rising RDS(ON) at low VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, or dual-cell alkaline/NiMH battery inputs without pre-regulation. |
| Switching Frequency | 2.25MHz (typical) - 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 rails (e.g., 1.8V/2.5V) in handheld devices with margin for transient loads. |
| Feedback Reference Voltage | 0.6V ±2% (–40°C to 125°C) - sets output voltage via external resistor divider; enables precise low-voltage regulation down to 0.6V. |
| Quiescent Current | 40μA (Burst Mode™, both channels active) - extends battery runtime in standby/sleep states without compromising wake-up response. |
| Shutdown Current | <1μA - ensures negligible battery drain during full system shutdown, critical for always-on sensors or backup rails. |
| Peak Switch RDS(ON) | 0.35Ω (P-ch top), 0.30Ω (N-ch bottom) - eliminates need for external Schottky diodes and minimizes conduction loss at 800mA. |
| Power-On Reset Threshold | ±8.5% output deviation - asserts open-drain POR signal until both outputs stabilize within tolerance, with 65,536-cycle delay (~29ms in Pulse Skip). |
Pinout & Package
10-Lead Plastic MSOP package (3mm × 3mm × 1.1mm height) with exposed pad (Pin 11) connected to PGND - requires soldering to PCB ground plane for thermal and electrical performance. Pin pitch: 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 Feedback Input | Connects to resistive divider on VOUT1; regulates output by comparing divided voltage to 0.6V reference. |
| RUN/SS1 (Pin 2) | Channel 1 Enable & Soft-Start | High = enable; low = shutdown; RC network here controls startup slew rate and inrush current limiting. |
| VIN (Pin 3) | Main Power Input | Supplies both channels; requires local 10μF ceramic decoupling close to pin to suppress high-frequency noise. |
| SW1 (Pin 4) | Channel 1 Switch Node | Connects to inductor L1; swings between VIN and GND; layout must minimize loop area to reduce EMI. |
| GND (Pin 5) | Analog & Power Ground | Common return for feedback, control logic, and input/output capacitors; ties to exposed pad (PGND). |
| MODE/SYNC (Pin 6) | Mode Selection / Clock Sync | Tie to VIN for Burst Mode™; tie to GND for Pulse Skip; apply external 2.25MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 Switch Node | Identical function to SW1; independent inductor connection; requires separate low-inductance routing. |
| POR (Pin 8) | Power-On Reset Output | Open-drain signal pulled low if either VOUT deviates >±8.5%; used to hold microcontroller in reset until stable. |
| RUN/SS2 (Pin 9) | Channel 2 Enable & Soft-Start | Independent control of second regulator; allows staggered startup or selective channel disable for power sequencing. |
| VFB2 (Pin 10) | Channel 2 Feedback Input | Same function as VFB1; enables independent voltage setting for dual-rail applications (e.g., 1.8V + 2.5V). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Enables simultaneous generation of two user-adjustable output voltages (0.6V–5V) with separate enable/soft-start control. |
| Burst Mode™ operation | Achieves 95% peak efficiency and 40μA quiescent current at light loads, extending battery life without sacrificing regulation accuracy. |
| No external Schottky diodes | Integrated synchronous rectification (0.35Ω/0.30Ω MOSFETs) eliminates forward voltage drop and associated heat, simplifying BOM. |
| 100% duty-cycle dropout | Maintains regulation when VIN drops near VOUT by fully turning on P-channel switch - critical for battery end-of-discharge operation. |
| Externally synchronizable oscillator | Allows alignment of switching edges across multiple converters to avoid beat frequencies and simplify EMI filtering in multi-rail systems. |
| Power-On Reset with timeout | Provides system-level reset assertion until both outputs settle within ±8.5%, with programmable delay via external clock sync. |
Applications
| Portable Digital Assistants | Digital Cameras |
|---|---|
|
Use Scenario: Powering CPU core, memory, and display interface in palm-sized computing devices with tight space constraints. IC Role / Device Role / Timing Role: Dual-output buck regulator supplying 1.2V core and 2.8V I/O rails from single Li-ion cell (2.7V–4.2V). Use Value: 2.25MHz operation allows use of 2.2μH inductors ≤1mm height, reducing solution footprint by >40% vs. 500kHz alternatives. |
Use Scenario: Delivering clean, sequenced power to image sensor, ISP, and flash LED drivers during burst capture mode. IC Role / Device Role / Timing Role: Independent soft-start on RUN/SS1 and RUN/SS2 ensures controlled ramp-up of analog and digital supplies to prevent sensor latch-up. Use Value: Burst Mode™ maintains >85% efficiency at 10mA sensor bias current, extending standby time between shots. |
| Cellular Handsets | Wireless Modems |
|
Use Scenario: Generating RF transceiver bias (2.85V) and baseband processor core (1.1V) in GSM/UMTS handsets with dynamic load profiles. IC Role / Device Role / Timing Role: MODE/SYNC pin configured for Pulse Skip Mode during call setup to minimize RF interference from output ripple. Use Value: <35mVPK-PK ripple in Pulse Skip Mode prevents AM modulation of RF front-end signals during transmission. |
Use Scenario: Supplying 3.3V USB PHY and 1.8V MAC controller in LTE/Wi-Fi client modems operating from USB bus or battery. IC Role / Device Role / Timing Role: POR output tied to modem's reset pin ensures firmware boot only after both rails are stable and within ±8.5%. Use Value: 65,536-cycle POR delay guarantees reliable initialization even under slow battery ramp-up conditions (<100ms). |
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, 1A; no POR, no soft-start pins; 17μA IQ in DCS-Control™ mode. | Lacks dual independent regulation and system-level reset - suitable only when one rail suffices and sequencing is handled externally. | Select when board space is more constrained than feature count, and single-rail operation meets system requirements. |
| RT8059NGQW | Dual-output, 2MHz, 600mA/channel; integrated compensation; no MODE/SYNC pin; 25μA IQ in auto-skip mode. | Fixed internal compensation reduces design flexibility; no external sync capability limits multi-converter EMI management. | Choose for cost-sensitive designs where 600mA per channel and absence of POR/soft-start are acceptable trade-offs. |
Compared with TPS62125DSCR and RT8059NGQW, the LTC3407AEMSE-2#PBF uniquely combines dual independent soft-start, programmable mode selection, open-drain POR, and 2.25MHz operation in a thermally enhanced MSOP - making it optimal for space-constrained, battery-powered systems requiring robust power sequencing and low-noise regulation.
Availability
LTC3407AEMSE-2#PBF is available at Aetrix Electronics and suitable for portable electronics, battery-powered imaging systems, and wireless communication modules requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across –40°C to +85°C.
Supply support for LTC3407AEMSE-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 ICs, serving industrial, automotive, communications, and consumer markets with precision, reliability, and innovation.
The LTC3407A series belongs to Linear's high-frequency monolithic DC/DC converter product line, engineered specifically for ultra-compact, high-efficiency power delivery in portable and battery-critical applications where size, thermal performance, and light-load efficiency are paramount.
FAQ
What is the maximum junction temperature and thermal resistance of the LTC3407AEMSE-2#PBF?
The LTC3407AEMSE-2#PBF has a maximum junction temperature (TJMAX) of 125°C, with thermal resistance θJA = 45°C/W and θJC = 10°C/W. The exposed pad (Pin 11) must be soldered to a PCB ground plane to achieve these ratings; insufficient thermal vias or missing pad connection will cause excessive temperature rise and potential thermal shutdown during sustained 800mA operation.
Can the LTC3407AEMSE-2#PBF operate with only one channel enabled?
Yes, the LTC3407AEMSE-2#PBF supports independent channel control: pulling RUN/SS1 low disables Channel 1 while Channel 2 remains operational if RUN/SS2 is high, and vice versa. Disabling one channel reduces total quiescent current to ~20μA and eliminates switching noise from that channel, useful for dynamic power scaling in multi-rail systems.
Does the LTC3407AEMSE-2#PBF require external compensation components?
No, the LTC3407AEMSE-2#PBF features fully internal compensation - no external capacitors or resistors are needed for loop stability. This simplifies design and reduces bill-of-materials cost, while maintaining robust transient response across the full 0.6V–5V output range and 2.5V–5.5V input range.
How does the POR function behave when only one output is enabled?
When only one channel is enabled, the POR pin remains low because the disabled channel's output is out of regulation. To assert POR only upon regulation of the active channel, connect the unused VFB pin to its corresponding RUN/SS pin (e.g., tie VFB2 to RUN/SS2 when using only Channel 1), forcing the disabled regulator into a known state that satisfies the ±8.5% criterion.
What is the minimum recommended inductor value for stable operation of the LTC3407AEMSE-2#PBF?
The minimum recommended inductor value is 2.2μH (e.g., Taiyo Yuden CB2016T2R2M), selected to limit peak-to-peak inductor ripple current to ≤30% of the 1.2A peak switch limit. Lower values increase ripple, degrade light-load efficiency in Burst Mode™, and may cause subharmonic oscillation; higher values reduce ripple but increase physical size and core losses.
LTC3407AEMSE-2#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
LTC3407AEMSE-2#PBF FAQ
1.How can I place an order for LTC3407AEMSE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407AEMSE-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 LTC3407AEMSE-2#PBF reliable?
The price and inventory of LTC3407AEMSE-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 LTC3407AEMSE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3407AEMSE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407AEMSE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407AEMSE-2#PBF?
LTC3407AEMSE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407AEMSE-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 LTC3407AEMSE-2#PBF?
For technical support, including LTC3407AEMSE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407AEMSE-2#PBF requirements.
6.How does Aetrix verify that LTC3407AEMSE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3407AEMSE-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 LTC3407AEMSE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3407AEMSE-2#PBF?
All LTC3407AEMSE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407AEMSE-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 LTC3407AEMSE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3407AEMSE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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