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Analog Devices Inc. LTC3407EDD-2#PBF
- Part No.:
- LTC3407EDD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407EDD-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,749
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Product details
Overview
LTC3407EDD-2#PBF from Analog Devices is a dual-channel synchronous step-down DC/DC regulator 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 PDA, digital camera, and cellular phone power rails.
For engineers reviewing the LTC3407EDD-2#PBF datasheet, LTC3407EDD-2#PBF pinout, LTC3407EDD-2#PBF application, or LTC3407EDD-2#PBF equivalent, key selection considerations include its 0.35Ω internal P-channel MOSFET RDS(ON), 40µA quiescent current in active mode, Burst Mode® vs pulse-skipping mode trade-offs, 100% duty-cycle dropout operation, and 3mm × 3mm DFN-11 (exposed pad) package compatibility with space-constrained PCB layouts.
Technical Context
The LTC3407EDD-2#PBF uses a constant-frequency current-mode control architecture with shared 2.25MHz oscillator across both channels, supporting in-phase switching and external synchronization via MODE/SYNC pin. Each channel integrates matched 0.35Ω P-channel high-side and 0.30Ω N-channel low-side synchronous switches, eliminating external Schottky diodes.
It features dual independent RUN pins (RUN1/RUN2), separate feedback inputs (VFB1/VFB2) referenced to a precision 0.6V bandgap, and a common open-drain POR output asserting low when either output deviates >±8.5% from regulation. The device enters 100% duty-cycle dropout when VIN approaches VOUT and draws <1µA in shutdown.
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 system rails without pre-regulation. |
| Switching Frequency | 2.25MHz (typ) - enables use of ≤2.2µH inductors and 10µF ceramic capacitors, minimizing solution footprint & height ≤1.2mm. |
| Output Current per Channel | 800mA continuous - sufficient for core logic, memory, and I/O rails in handheld devices. |
| Feedback Reference Voltage | 0.6V ±12mV (–40°C to 85°C) - sets output accuracy and enables precise 0.6V–5V adjustment via external resistor divider. |
| Quiescent Current | 40µA (typ) total for both channels - extends battery runtime in always-on subsystems. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or storage. |
| Internal Switch RDS(ON) | 0.35Ω (high-side), 0.30Ω (low-side) - eliminates external diodes and achieves up to 95% peak efficiency. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = PGND). RoHS-compliant, lead-free finish (#PBF). Thermal resistance θJA = 45°C/W, θJC = 10°C/W.
| 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 reference. |
| RUN1 (Pin 2) | Channel 1 enable control | Drive high to enable Regulator 1; drive low to shut down - no floating allowed. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10µF ceramic decoupling to GND/PGND. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND - critical for EMI layout. |
| GND (Pin 5) | Analog ground reference | Separate from PGND; connects to PCB ground plane for noise isolation of feedback path. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode® (high efficiency); tie to GND for pulse-skipping (low ripple); accept external 2.25MHz clock. |
| SW2 (Pin 7) | Channel 2 switch node | Connects to inductor L2; identical timing and voltage swing as SW1. |
| POR (Pin 8) | Power-on reset output | Open-drain signal pulled low if either VOUT is out of ±8.5%; releases after ~117ms in regulation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for Regulator 2 - allows staggered startup or dynamic channel disable. |
| VFB2 (Pin 10) | Channel 2 feedback input | Identical function to VFB1; supports independent output voltage setting for VOUT2. |
| PGND (Pin 11) | Power ground / thermal pad | Must be soldered to large PCB copper area for thermal dissipation and low-impedance return path for switch currents. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes, reduces component count, and improves thermal performance over asynchronous designs. |
| Burst Mode® operation | Reduces quiescent current to 40µA while maintaining regulation - ideal for standby power in battery-operated devices. |
| Pulse-skipping mode | Maintains constant 2.25MHz switching under light loads, minimizing output voltage ripple for noise-sensitive analog circuits. |
| 100% duty-cycle dropout | Enables seamless transition to linear regulation as input drops near output voltage - preserves functionality during brownout. |
| Integrated power-on reset (POR) | Provides system-level power sequencing assurance by signaling valid regulation status across both outputs. |
Applications
| Mobile Baseband Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Dual-rail power for 3G/4G baseband processor requiring 1.2V core and 2.8V I/O. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator delivering regulated, sequenced supplies with POR coordination. Use Value: 2.25MHz switching enables ultra-compact 2.2µH/10µF filter design; 40µA quiescent current extends talk time. |
Use Scenario: Powering image sensor, ISP, and LCD interface in compact digital camera modules. IC Role / Device Role / Timing Role: Dual synchronous buck supplying 1.8V sensor core and 3.3V interface rail with low-noise pulse-skipping mode. Use Value: Pin-compatible dual outputs reduce BOM count; 0.6V reference enables accurate low-voltage scaling for modern sensors. |
| Portable Media Player SoC | Wireless Modem RF Front-End |
Use Scenario: Providing 1.1V CPU core and 1.8V memory supply in MP3/MP4 players with tight height constraints. IC Role / Device Role / Timing Role: Compact dual buck regulator operating from single-cell Li-ion (2.7V–4.2V) with integrated thermal management. Use Value: 3mm × 3mm DFN package fits under display; 95% peak efficiency minimizes heat generation in sealed enclosures. |
Use Scenario: Generating clean 2.5V PA bias and 1.8V transceiver supply in DSL/wireless modems with strict EMI limits. IC Role / Device Role / Timing Role: Dual-output regulator with independent RUN control for dynamic power gating of RF sections. Use Value: MODE/SYNC pin allows real-time ripple/noise trade-off; POR output synchronizes modem boot sequence. |
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 |
|---|---|---|---|
| TPS62125DSGR | Single-output, 3MHz, 300mA, 0.6V ref, 16V max input - lacks second channel and POR. | Suitable only for single-rail systems; cannot replace dual-output functionality without adding second IC. | Select only when application requires higher input voltage (up to 16V) and single-rail simplicity outweighs need for dual regulation. |
| RT8059NGQW | Dual-output, 2MHz, 600mA/channel, 0.6V ref, 5.5V max input, but no MODE/SYNC selectable modes or POR output. | No Burst Mode® or pulse-skipping option; no power-good signaling - limits use in sequenced or low-noise systems. | Consider for cost-sensitive dual-rail apps where efficiency/ripple trade-off and POR are not required. |
Compared with TPS62125DSGR and RT8059NGQW, the LTC3407EDD-2#PBF uniquely delivers dual independent 800mA outputs with programmable low-power modes, integrated POR, and 2.25MHz operation in a 3mm × 3mm DFN - making it the only option that satisfies simultaneous requirements for compact dual-rail power, battery longevity, and system-level power sequencing in portable electronics.
Availability
LTC3407EDD-2#PBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera core supply, portable media player SoC, wireless modem RF front-end, and other applications requiring stable component supply with automotive-grade reliability options.
Supply support for LTC3407EDD-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 digital signal processing semiconductors.
The LTC3407EDD-2#PBF belongs to Linear Technology's high-frequency synchronous buck regulator product line, designed specifically for space- and power-constrained portable electronics requiring dual independent outputs, ultra-low quiescent current, and robust power sequencing capability.
FAQ
What is the maximum output current per channel for the LTC3407EDD-2#PBF?
The LTC3407EDD-2#PBF delivers up to 800mA continuous output current per channel under typical conditions (VIN = 3.6V, TA = 25°C). Peak switch current limit is 1.2A, and performance is specified across –40°C to 85°C ambient temperature. Derating applies at elevated temperatures or lower input voltages due to thermal constraints and RDS(ON) increase.
Does the LTC3407EDD-2#PBF require external Schottky diodes?
No, the LTC3407EDD-2#PBF does not require external Schottky diodes. It integrates synchronous P-channel (0.35Ω) and N-channel (0.30Ω) MOSFETs per channel, enabling high-efficiency operation without external rectification components - reducing BOM count, board area, and thermal overhead.
How does the MODE/SYNC pin affect operation of the LTC3407EDD-2#PBF?
The MODE/SYNC pin on the LTC3407EDD-2#PBF serves dual functions: tying it to VIN enables Burst Mode® for highest light-load efficiency (40µA IQ), tying it to GND selects pulse-skipping mode for lowest output ripple, and applying an external 2.25MHz clock synchronizes switching while forcing pulse-skipping mode - ensuring deterministic timing in multi-regulator systems.
What is the purpose of the POR pin on the LTC3407EDD-2#PBF?
The POR (Power-On Reset) pin on the LTC3407EDD-2#PBF is an open-drain output that remains low until both regulated outputs are within ±8.5% of their target voltages for ~117ms (262,144 clock cycles). It provides system-level power-good signaling for microcontroller reset sequencing and ensures reliable boot-up in portable electronics.
Can the LTC3407EDD-2#PBF operate with input voltage below 2.5V?
No, the LTC3407EDD-2#PBF has a minimum specified input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics. Operation below this level risks functional failure or damage. Undervoltage lockout activates below ~1.65V, but reliable regulation is only guaranteed from 2.5V to 5.5V - consistent with single-cell Li-ion/Li-polymer battery operational range.
LTC3407EDD-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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-DFN (3x3)
LTC3407EDD-2#PBF FAQ
1.How can I place an order for LTC3407EDD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407EDD-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 LTC3407EDD-2#PBF reliable?
The price and inventory of LTC3407EDD-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 LTC3407EDD-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3407EDD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407EDD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407EDD-2#PBF?
LTC3407EDD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407EDD-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 LTC3407EDD-2#PBF?
For technical support, including LTC3407EDD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407EDD-2#PBF requirements.
6.How does Aetrix verify that LTC3407EDD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3407EDD-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 LTC3407EDD-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3407EDD-2#PBF?
All LTC3407EDD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407EDD-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 LTC3407EDD-2#PBF part is unused and in its original packaging.
Return procedure for LTC3407EDD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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