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Analog Devices Inc. LTC3407EMSE-2#PBF
- Part No.:
- LTC3407EMSE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3407EMSE-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:156
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Product details
Overview
LTC3407EMSE-2#PBF from Analog Devices is a dual synchronous step-down DC/DC regulator delivering up to 800mA per channel from 2.5V–5.5V input, operating at a fixed 2.25MHz switching frequency with internal 0.35Ω P-channel and 0.30Ω N-channel MOSFETs. It supports adjustable output voltages from 0.6V to 5V and enables low-noise or high-efficiency operation via MODE/SYNC pin selection-used in portable media players, digital cameras, and cellular phone power rails.
For engineers reviewing the LTC3407EMSE-2#PBF datasheet, LTC3407EMSE-2#PBF pinout, LTC3407EMSE-2#PBF application, or LTC3407EMSE-2#PBF equivalent, key selection criteria include dual-channel 800mA capability, 2.25MHz constant-frequency operation, Burst Mode® vs pulse-skipping mode trade-offs, 40µA quiescent current, and MSOP-10 package compatibility with thermal pad grounding requirements.
Technical Context
The LTC3407EMSE-2#PBF employs a current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling in-phase switching and precise load transient response. Each channel integrates matched P-channel (0.35Ω) and N-channel (0.30Ω) synchronous switches, eliminating external Schottky diodes while supporting 100% duty-cycle dropout operation.
Its dual-mode operation-Burst Mode® for ≤95% efficiency at light loads and pulse-skipping for low-noise regulation-is selected via MODE/SYNC pin voltage thresholds (0–0.5V for pulse-skipping, VIN–0.5V to VIN for Burst Mode). The device includes independent RUN1/RUN2 enables, VFB1/VFB2 feedback inputs referenced to 0.6V ±1.2%, and open-drain POR output with ±8.5% detection window and 117ms delay.
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 LDO pre-regulation. |
| Switching Frequency | 2.25MHz (±25%) - enables use of 2.2µH inductors and 10µF ceramic capacitors with ≤1.2mm profile. |
| Output Current per Channel | 800mA continuous - sufficient for core logic, memory, and I/O rails in portable devices. |
| Feedback Reference Voltage | 0.6V ±2% over –40°C to 85°C - sets output via resistor divider; enables 0.6V–5V adjustment with <0.5% line/load regulation error. |
| Quiescent Current | 40µA total (both channels active) - extends battery runtime in always-on subsystems like camera sensors or Bluetooth radios. |
| Shutdown Current | <1µA - meets ultra-low-power system sleep requirements when both regulators are disabled. |
| Peak Switch Current Limit | 1.2A typical - provides robust short-circuit protection while allowing margin above 800mA rated output. |
Pinout & Package
Package: 10-Lead Plastic MSOP with exposed thermal pad (Pin 11 = PGND), 3mm × 3mm footprint, θJA = 45°C/W. Requires solder connection 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 resistor divider output; regulates VOUT1 to 0.6V reference - determines output voltage via R2/R1 ratio. |
| RUN1 (Pin 2) | Channel 1 Enable Control | High = enable (pull to VIN); low = shutdown (pull to GND); must not float - controls startup sequencing and power gating. |
| VIN (Pin 3) | Main Power Input | Supplies both channels; requires local 10µF ceramic decoupling close to pin to suppress high-frequency switching noise. |
| SW1 (Pin 4) | Channel 1 Switch Node | Connects to inductor L1; swings between VIN and GND - carries high di/dt; must be routed with minimal loop area to reduce EMI. |
| GND (Pin 5) | Analog Ground Reference | Separate from PGND; connects to feedback resistors and error amplifier ground - maintains signal integrity for VFB sensing. |
| MODE/SYNC (Pin 6) | Mode Selection & Sync Input | Ground = pulse-skipping (low ripple); VIN = Burst Mode® (high efficiency); external clock = forced pulse-skipping sync. |
| SW2 (Pin 7) | Channel 2 Switch Node | Identical function to SW1 but for second channel - requires independent inductor and layout isolation to prevent crosstalk. |
| POR (Pin 8) | Power-On Reset Output | Open-drain; pulls low if either VOUT deviates >±8.5% or RUN pins are inactive - used for system reset assertion and sequencing. |
| RUN2 (Pin 9) | Channel 2 Enable Control | Independent enable for second regulator - allows staggered startup or selective channel disable for dynamic power management. |
| VFB2 (Pin 10) | Channel 2 Feedback Input | Same function as VFB1 for VOUT2 - enables independent 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 large PCB ground plane - critical for thermal dissipation (θJC = 10°C/W) and switch return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 800mA synchronous buck topology | Eliminates external Schottky diodes and reduces BOM count while maintaining ≥95% peak efficiency across both channels. |
| Burst Mode® operation | Reduces quiescent current to 40µA and sustains >85% efficiency at 1mA load - ideal for standby power in battery-operated systems. |
| 2.25MHz fixed-frequency switching | Enables compact 2.2µH inductors and 10µF ceramic capacitors, minimizing solution size and height (<1.2mm component profile). |
| 100% duty-cycle dropout support | Extends usable input range down to VOUT + RDS(ON)•ILOAD; maintains regulation during brownout conditions without external circuitry. |
| Integrated power-on reset (POR) | Provides system-level reset timing with ±8.5% accuracy and 117ms delay - eliminates need for discrete supervisor IC in space-constrained designs. |
Applications
| Digital Camera Core Power | Cellular Phone Application Processor Rail |
|---|---|
|
Use Scenario: Dual-rail power for image sensor (1.8V) and ISP (2.5V) in compact digital cameras with Li-ion battery input. IC Role / Device Role / Timing Role: LTC3407EMSE-2#PBF delivers regulated, low-noise 1.8V and 2.5V outputs with independent RUN control for power sequencing. Use Value: 2.25MHz operation allows tiny 2.2µH inductors and 10µF ceramics, reducing board area by >40% versus 500kHz solutions while meeting EMI limits. |
Use Scenario: Primary core voltage supply for ARM-based application processors in smartphones, requiring fast transient response and low quiescent current. IC Role / Device Role / Timing Role: LTC3407EMSE-2#PBF provides two independent 800mA buck regulators with Burst Mode® for deep-sleep states and pulse-skipping for active mode. Use Value: 40µA quiescent current extends standby time; 1.2A peak switch current handles CPU burst loads without dropout. |
| Portable Media Player Audio Codec Supply | PDA System Memory & I/O Rail |
|
Use Scenario: Clean, low-ripple 3.3V supply for audio DAC/ADC and 1.2V for DSP core in portable media players powered by single-cell Li-ion. IC Role / Device Role / Timing Role: LTC3407EMSE-2#PBF uses pulse-skipping mode (MODE/SYNC = GND) to minimize output voltage ripple affecting audio SNR. Use Value: <10mVPP ripple at 200mA ensures >95dB SNR in 24-bit audio paths without additional LC filtering. |
Use Scenario: Dual-voltage generation for SDRAM (3.3V) and microcontroller I/O (1.8V) in handheld PDAs with tight height constraints. IC Role / Device Role / Timing Role: LTC3407EMSE-2#PBF integrates both regulators in one MSOP-10 package, simplifying layout and reducing thermal hotspots. Use Value: Exposed PGND pad and 45°C/W θJA allow full 800mA/channel operation at 70°C ambient without derating. |
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 |
|---|---|---|---|
| TPS62125DSGR | Single-channel 1.2A buck; 2.5V–6V input; 3MHz switching; no integrated POR or MODE pin. | Requires two ICs for dual-rail; lacks power-on reset and dual-mode selection - increases BOM and layout complexity. | Select only if higher per-channel current (1.2A) is required and POR is implemented externally. |
| RT8059GQW | Dual-channel 600mA buck; 2.5V–5.5V input; 1.5MHz switching; no Burst Mode®, only PWM-only operation. | Lower max output current per channel; fixed PWM limits light-load efficiency to ~75% - unsuitable for long battery life. | Choose only if cost sensitivity outweighs efficiency and ripple requirements, and 600mA/channel suffices. |
Compared with TPS62125DSGR and RT8059GQW, the LTC3407EMSE-2#PBF uniquely combines dual 800mA channels, 2.25MHz operation, Burst Mode®/pulse-skipping selection, and integrated POR in a single MSOP-10 package - delivering superior integration, efficiency flexibility, and system-level functionality for portable battery-powered designs.
Availability
LTC3407EMSE-2#PBF is available at Aetrix Electronics and suitable for digital camera power management, cellular phone baseband processor supplies, and portable media player audio subsystems requiring stable component supply, automotive-grade reliability (AEC-Q100 qualified variants exist), and long-term production continuity.
Supply support for LTC3407EMSE-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 (now part of Analog Devices, Inc. following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3407 series was designed specifically for space-constrained, battery-powered portable electronics requiring dual independent buck regulation with ultra-low quiescent current and high-frequency operation - targeting PDA, camera, and smartphone power architectures.
FAQ
What is the maximum output current per channel for the LTC3407EMSE-2#PBF?
The LTC3407EMSE-2#PBF delivers up to 800mA continuous output current per channel under typical thermal conditions (TA ≤ 85°C, proper PCB copper pour on PGND pad). Peak switch current is rated at 1.2A, providing margin for transient loads. Derating is required above 85°C ambient or with insufficient thermal copper.
How does the MODE/SYNC pin affect LTC3407EMSE-2#PBF operation?
The MODE/SYNC pin selects between Burst Mode® (pin tied to VIN) for highest light-load efficiency or pulse-skipping mode (pin tied to GND) for lowest output voltage ripple. When driven by an external 2.25MHz clock, the LTC3407EMSE-2#PBF synchronizes and defaults to pulse-skipping mode - ensuring deterministic timing and reduced EMI in multi-regulator systems.
Can LTC3407EMSE-2#PBF operate with input voltage below 2.5V?
No - the absolute minimum input voltage for LTC3407EMSE-2#PBF is 2.5V as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold risks undervoltage lockout activation or unstable regulation. For sub-2.5V inputs, consider the LTC3522 or LTC3536 families.
What is the purpose of the exposed pad (Pin 11) on the LTC3407EMSE-2#PBF MSOP package?
The exposed pad (Pin 11) is PGND - a dedicated power ground connection that must be soldered to a large PCB ground plane. It serves dual roles: thermal conduction (θJC = 10°C/W) and low-impedance return path for high-current switch nodes (SW1/SW2), directly impacting efficiency, thermal performance, and EMI behavior.
Does LTC3407EMSE-2#PBF support output voltages lower than 0.6V?
No - the internal reference voltage is fixed at 0.6V, and the datasheet specifies a minimum output voltage of 0.6V. The feedback network is designed to scale higher outputs (up to 5V); attempting sub-0.6V operation violates the error amplifier's common-mode input range and results in loss of regulation. For sub-0.6V outputs, use a different regulator such as the LTC3620.
LTC3407EMSE-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
LTC3407EMSE-2#PBF FAQ
1.How can I place an order for LTC3407EMSE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407EMSE-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 LTC3407EMSE-2#PBF reliable?
The price and inventory of LTC3407EMSE-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 LTC3407EMSE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3407EMSE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407EMSE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407EMSE-2#PBF?
LTC3407EMSE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407EMSE-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 LTC3407EMSE-2#PBF?
For technical support, including LTC3407EMSE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407EMSE-2#PBF requirements.
6.How does Aetrix verify that LTC3407EMSE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3407EMSE-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 LTC3407EMSE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3407EMSE-2#PBF?
All LTC3407EMSE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407EMSE-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 LTC3407EMSE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3407EMSE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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