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Analog Devices Inc. LTC3407EDD-4#PBF
- Part No.:
- LTC3407EDD-4#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407EDD-4#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:911
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Product details
Overview
LTC3407EDD-4#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC converter optimized for low-power portable applications. 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 solutions in PDAs, digital cameras, and cellular handsets.
For engineers reviewing the LTC3407EDD-4#PBF datasheet, LTC3407EDD-4#PBF pinout, LTC3407EDD-4#PBF application, or LTC3407EDD-4#PBF 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 trade-offs, 0.35Ω internal P-channel switch RDS(ON), and DFN-10 (3mm × 3mm) thermal performance with exposed PGND pad.
Technical Context
The LTC3407EDD-4#PBF employs a current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling in-phase switching and precise load transient response. Its error amplifier compares feedback voltage against a 0.6V reference, modulating peak inductor current via ITH voltage to maintain regulation.
Two selectable light-load modes are implemented via the MODE/SYNC pin: Burst Mode® (for ≤40μA quiescent current and highest efficiency below ~10mA load) and pulse-skipping mode (for low-noise operation down to microamp loads). The device enters 100% duty-cycle dropout when VIN approaches VOUT, with P-channel MOSFETs remaining fully enhanced.
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 (typ) - enables use of sub-3mm-height 2.2μH inductors and 10μF ceramic capacitors, minimizing board area. |
| Output Current per Channel | 800mA - sufficient for core logic, memory, and RF ICs in handheld devices. |
| Feedback Reference Voltage | 0.6V ±12mV (–40°C to 85°C) - sets output accuracy and enables precise 1.2V, 1.8V, 2.5V, or 3.3V generation with standard resistor ratios. |
| 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. |
| Power-On Reset Delay | 65536 clock cycles (~29ms in pulse-skipping mode) - provides deterministic system initialization timing after power-up. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed power ground pad (Pin 11), rated for –40°C to +85°C ambient operation and θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider on VOUT1; 0.6V threshold sets output voltage with ±2% tolerance over temperature. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enabled; low = shutdown; must be actively driven-floating causes undefined behavior. |
| VIN (Pin 3) | Main power input | Supplies both regulators; 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 must minimize loop area to reduce EMI. |
| GND (Pin 5) | Analog ground reference | Not internally connected; serves as shield and return path for feedback and control signals. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode®; tie to GND for pulse-skipping; apply 2.25MHz square wave for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; independent inductor connection required for each channel. |
| POR (Pin 8) | Power-on reset open-drain output | Pulled low if either VOUT is outside ±8.5%; releases after 216 clock cycles once both outputs stabilize. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for second regulator; allows staggered power sequencing or dynamic channel disable. |
| VFB2 (Pin 10) | Channel 2 feedback input | Functionally identical to VFB1; supports independent output voltage programming per channel. |
| Exposed Pad (Pin 11) | Power ground (PGND) | Mandatory solder connection to PCB ground plane; critical for thermal dissipation and low-noise switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes; achieves up to 95% efficiency at 800mA 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 in battery-operated systems. |
| Externally synchronizable oscillator | Accepts 2.25MHz clock on MODE/SYNC pin to eliminate beat frequencies in multi-regulator systems and reduce EMI. |
| 100% duty-cycle dropout | Enables seamless transition to linear regulation as input voltage drops near output level-preserves output stability without brownout. |
| Integrated power-on reset | Provides system-level reset signal with programmable delay; eliminates need for discrete POR IC in space-constrained designs. |
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 rails from a single Li-ion cell. IC Role / Device Role / Timing Role: LTC3407EDD-4#PBF acts as primary dual-output DC/DC regulator, delivering regulated 1.2V/800mA and 2.8V/800mA with tight cross-regulation and fast load transient response. Use Value: 2.25MHz switching enables ultra-compact 2.2μH inductors and 10μF ceramic caps-reducing solution footprint by >40% versus 500kHz alternatives. | Use Scenario: Power management for CMOS image sensor and ISP in compact digital camera modules. IC Role / Device Role / Timing Role: LTC3407EDD-4#PBF supplies 1.8V sensor analog rail and 3.3V digital interface rail, with independent RUN pin control enabling power gating during idle periods. Use Value: 40μA quiescent current extends battery life during preview mode; Burst Mode® maintains regulation without audible coil whine. |
| Wireless Modem RF Front-End | PDA Application Processor Core |
Use Scenario: Clean, low-noise power for LTE PA driver and transceiver bias rails in DSL/wireless modems. IC Role / Device Role / Timing Role: LTC3407EDD-4#PBF operates in pulse-skipping mode (MODE/SYNC = GND) to suppress switching noise near sensitive RF paths. Use Value: Sub-20mVpp output ripple at light loads prevents AM interference in adjacent 2.4GHz/5GHz bands. | Use Scenario: Core and memory voltage scaling for ARM-based PDA SoCs with dynamic voltage/frequency scaling (DVFS). IC Role / Device Role / Timing Role: LTC3407EDD-4#PBF delivers 1.0V core and 1.8V memory rails, with POR output coordinating system boot sequence and watchdog reset timing. Use Value: 65536-cycle POR delay ensures stable power delivery before CPU initialization-eliminating boot failures due to premature reset release. |
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 |
|---|---|---|---|
| TPS62400DRVR | Fixed 1.2V/1.8V outputs; no adjustable feedback; 3MHz switching; 25μA IQ in DCS-Control™ mode. | Less flexible for custom voltage combinations; better suited for fixed-rail applications with tighter size constraints. | Select TPS62400DRVR only when dual fixed outputs match system requirements and 3MHz operation is acceptable. |
| RT8059ZSP | 2.5MHz switching; 0.6V reference; but only 600mA per channel; no integrated POR; MSOP-10 package only. | Lower current capability limits use in high-performance processors; absence of POR requires external reset IC. | Choose RT8059ZSP where cost sensitivity outweighs need for POR integration and 800mA headroom. |
Compared with TPS62400DRVR and RT8059ZSP, the LTC3407EDD-4#PBF offers unique value through its adjustable dual outputs, integrated POR with programmable delay, and proven Burst Mode® efficiency at microamp loads-making it optimal for battery-powered systems requiring design flexibility and long standby life.
Availability
LTC3407EDD-4#PBF is available at Aetrix Electronics and suitable for mobile computing, imaging, and wireless communications applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3407EDD-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3407EDD-4#PBF belongs to Linear's µPower DC/DC converter family, designed specifically for space- and energy-constrained portable electronics where small size, low quiescent current, and high efficiency at light loads are critical.
FAQ
What is the maximum output current per channel for the LTC3407EDD-4#PBF?
The LTC3407EDD-4#PBF delivers up to 800mA per channel continuously under typical conditions (TA = 25°C, 2.2μH inductor, 10μF ceramic output caps). Peak switch current limit is 1.2A, but sustained output is limited by thermal dissipation in the DFN-10 package. Derating is required above 85°C ambient or with poor PCB copper area.
Does the LTC3407EDD-4#PBF require external Schottky diodes?
No, the LTC3407EDD-4#PBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs with 0.35Ω and 0.30Ω RDS(ON), respectively, enabling high-efficiency operation without external rectification components.
How does the MODE/SYNC pin affect operation of the LTC3407EDD-4#PBF?
The MODE/SYNC pin selects between Burst Mode® (tie to VIN) for lowest quiescent current or pulse-skipping mode (tie to GND) for lowest output ripple. When driven with a 2.25MHz external clock, it forces pulse-skipping mode and synchronizes switching edges-reducing beat frequencies in multi-regulator systems.
What is the purpose of the POR pin on the LTC3407EDD-4#PBF?
The POR (Power-On Reset) pin on the LTC3407EDD-4#PBF is an open-drain output that remains low until both output voltages are within ±8.5% of their target values for 65536 clock cycles (~29ms in pulse-skipping mode). It provides a reliable system reset signal without requiring external supervision circuitry.
Can the LTC3407EDD-4#PBF operate with input voltage below 2.5V?
No-the LTC3407EDD-4#PBF has a specified minimum input voltage of 2.5V. Below this, undervoltage lockout disables operation. The absolute maximum rating allows –0.3V to 6V, but functional operation is guaranteed only from 2.5V to 5.5V per the Electrical Characteristics table.
LTC3407EDD-4#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-4#PBF FAQ
1.How can I place an order for LTC3407EDD-4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407EDD-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 LTC3407EDD-4#PBF reliable?
The price and inventory of LTC3407EDD-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 LTC3407EDD-4#PBF is usually 5 days.
3.What payment methods are accepted for LTC3407EDD-4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407EDD-4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407EDD-4#PBF?
LTC3407EDD-4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407EDD-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 LTC3407EDD-4#PBF?
For technical support, including LTC3407EDD-4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407EDD-4#PBF requirements.
6.How does Aetrix verify that LTC3407EDD-4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3407EDD-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 LTC3407EDD-4#PBF meets industry standards.
7.What is the process for return or replacement of LTC3407EDD-4#PBF?
All LTC3407EDD-4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407EDD-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 LTC3407EDD-4#PBF part is unused and in its original packaging.
Return procedure for LTC3407EDD-4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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