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Analog Devices Inc. LTC3407EDD#PBF
- Part No.:
- LTC3407EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,185
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Product details
Overview
LTC3407EDD#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous step-down DC/DC converter IC designed for low-power portable systems. It delivers up to 600mA per channel from a 2.5V–5.5V input, operates at a fixed 1.5MHz switching frequency, integrates 0.35Ω P-channel and 0.30Ω N-channel MOSFETs, and supports adjustable output voltages from 0.6V to 5V - used in digital camera power rails and cellular phone baseband supplies.
For engineers reviewing the LTC3407EDD#PBF datasheet, LTC3407EDD#PBF pinout, LTC3407EDD#PBF application, or LTC3407EDD#PBF equivalent, key selection criteria include its dual-output burst-mode efficiency (96% peak), 40μA quiescent current, 100% duty-cycle dropout operation, and DFN-10 (3mm × 3mm) thermal performance with exposed PGND pad.
Technical Context
The LTC3407EDD#PBF employs a constant-frequency, current-mode control architecture with shared 1.5MHz oscillator across both channels, enabling in-phase switching and precise load transient response. Its error amplifier compares VFB to a 0.6V reference, modulating peak inductor current via ITH voltage to maintain regulation under line and load variations.
Two selectable light-load modes are implemented via the MODE/SYNC pin: Burst Mode® (for <1μA shutdown IQ and high efficiency at sub-10mA loads) and pulse-skipping mode (for low-output-ripple operation down to near-zero load). The integrated POR output asserts low when either output deviates >±8.5% from target and releases after 262,144 clock cycles (~175ms).
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 external LDO pre-regulation. |
| Switching Frequency | 1.5MHz (typ) - enables use of compact 2.2μH inductors & 10μF ceramic capacitors, minimizing board area in space-constrained designs. |
| Output Current per Channel | 600mA continuous - sufficient for powering core logic, memory, and interface ICs in handheld devices. |
| Feedback Reference Voltage | 0.6V ±1.2% - sets output voltage via external resistor divider; enables precise 1.2V, 1.8V, 2.5V, or 3.3V rails with <±1% total error over temperature. |
| Quiescent Current | 40μA (total, both channels active) - extends battery runtime in always-on subsystems such as real-time clocks or sensor wake-up circuits. |
| Shutdown Current | <1μA - meets ultra-low-power requirements for deep-sleep states in portable electronics. |
| Internal Switch RDS(ON) | 0.35Ω (P-ch top), 0.30Ω (N-ch bottom) - eliminates need for external Schottky diodes and reduces conduction loss at 600mA load. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed power ground pad (Pin 11). Thermal resistance θJA = 45°C/W; requires soldering exposed pad to PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider output; regulates VOUT1 to 0.6V × (1 + R2/R1); high-impedance (30nA bias) minimizes divider current loss. |
| RUN1 (Pin 2) | Channel 1 enable control | Logic-high (≥1.5V) enables regulator 1; logic-low (≤0.3V) shuts down channel with <1μA leakage; must not float. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling to GND to suppress high-frequency switching noise. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND; layout critical - minimize trace length/loop area to reduce EMI. |
| GND (Pin 5) | Analog ground reference | Provides signal return for feedback and control circuitry; separate from PGND but tied to exposed pad on PCB. |
| 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 1.5MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; independent inductor connection required; avoid coupling between SW1/SW2 traces. |
| POR (Pin 8) | Power-on reset open-drain output | Pulls low if either VOUT1 or VOUT2 is outside ±8.5%; releases after ~175ms in regulation; drives external MCU reset or enable logic. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for second regulator; allows staggered power-up or dynamic channel disable for power sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Functionally identical to VFB1; supports independent output voltage setting for dual-rail applications (e.g., 1.8V + 2.5V). |
| Exposed Pad (Pin 11) | Power ground (PGND) | Mandatory connection to PCB ground plane; carries high-frequency return current from both switches; improves thermal dissipation and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes, reduces BOM count, and improves efficiency by 5–10% vs. asynchronous designs at 600mA. |
| Burst Mode® operation | Enables 90%+ efficiency at 1mA load while maintaining 40μA quiescent current - critical for battery-backed standby functions. |
| 100% duty-cycle dropout | Supports VOUT ≥ VIN − (ILOAD × 0.35Ω) operation; maintains regulation during brownout conditions without output collapse. |
| Integrated POR with 175ms delay | Provides reliable system-level reset timing for microcontrollers and FPGAs without external RC networks or supervisor ICs. |
| Externally synchronizable 1.5MHz oscillator | Prevents beat frequencies in multi-regulator systems and simplifies EMI filtering by aligning switching edges across power domains. |
Applications
| Digital Camera Core Power | Cellular Phone Baseband Supply |
|---|---|
Use Scenario: Powers image sensor interface, ISP, and memory controller in compact digital cameras with single Li-ion cell input. IC Role / Device Role / Timing Role: Dual-output DC/DC regulator delivering 1.2V @ 400mA (core) and 2.8V @ 300mA (I/O) simultaneously from 3.3V nominal input. Use Value: 95% efficiency at 200mA load extends recording time; Burst Mode® sustains >85% efficiency at 5mA display-backlight standby current. | Use Scenario: Supplies application processor core and modem subsystem in GSM/UMTS handsets with tight height constraints. IC Role / Device Role / Timing Role: Generates 1.35V CPU rail and 1.8V memory rail from 3.6V battery; synchronized switching avoids interference with RF transceiver bands. Use Value: 3mm × 3mm DFN package fits beneath display module; 40μA quiescent current minimizes self-discharge during idle periods. |
| Portable Media Player Audio Codec | Wireless Modem RF Front-End Bias |
Use Scenario: Provides clean, low-noise 1.8V and 3.3V rails for stereo DAC/ADC and headphone amplifier in MP3 players. IC Role / Device Role / Timing Role: Uses pulse-skipping mode on VOUT2 (3.3V) to limit output ripple to <10mVpp during audio playback, while Burst Mode® runs VOUT1 (1.8V) for logic. Use Value: Dual-mode flexibility eliminates need for separate low-noise LDO post-regulators, reducing cost and footprint. | Use Scenario: Generates stable 2.5V and 3.3V bias voltages for PA driver stages and RF switch control in 802.11b/g/n modules. IC Role / Device Role / Timing Role: Delivers regulated outputs immune to battery voltage sag during transmit bursts; POR output triggers PA enable sequencing. Use Value: 100% duty-cycle operation maintains 2.5V output even as battery drops to 2.8V; short-circuit protection prevents latch-up during antenna mismatch events. |
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 |
|---|---|---|---|
| TPS62231DRYT | Single-channel, 600mA, 3MHz fixed-frequency buck; no Burst Mode®, only PWM/pulse-skipping; 0.45Ω internal switches. | Lacks dual-output capability; requires two devices for same functionality; higher switching frequency enables smaller inductors but increases gate drive loss. | Select when board space permits discrete dual-channel implementation and higher-frequency operation is preferred over integrated simplicity. |
| RT8059NGQW | Dual-channel, 600mA/channel, 1.5MHz, but uses external compensation and lacks integrated POR; 0.28Ω/0.25Ω RDS(ON). | No power-on reset output; requires external supervisor IC for system reset; higher efficiency at full load but less integrated feature set. | Choose when POR is handled elsewhere and design prioritizes maximum efficiency over integration and ease of use. |
Compared with TPS62231DRYT and RT8059NGQW, the LTC3407EDD#PBF provides unique integration of dual regulation, Burst Mode® efficiency, and POR in a single 3mm × 3mm DFN - reducing component count and simplifying power sequencing in battery-powered portable designs.
Availability
LTC3407EDD#PBF is available at Aetrix Electronics and suitable for digital camera power management, cellular handset baseband supplies, and portable media player audio subsystems requiring stable component supply across extended production lifecycles.
Supply support for LTC3407EDD#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#PBF belongs to Linear's µPower synchronous buck regulator product line, engineered specifically for ultra-low-quiescent-current, dual-rail power conversion in space- and battery-constrained portable electronics.
FAQ
What is the maximum output current per channel for the LTC3407EDD#PBF?
The LTC3407EDD#PBF delivers up to 600mA continuous output current per channel under typical conditions (TA = 25°C, 2.5V ≤ VIN ≤ 5.5V). Peak switch current limit is guaranteed at 0.75A to 1.25A, and thermal derating applies above 85°C ambient. The device maintains regulation at 100% duty cycle in dropout, supporting operation down to VIN ≈ VOUT + (ILOAD × 0.35Ω).
Does the LTC3407EDD#PBF require external Schottky diodes?
No, the LTC3407EDD#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 diode conduction losses. This internal synchronous rectification is confirmed in the datasheet's "No Schottky Diodes Required" feature list and functional block diagram.
How does the MODE/SYNC pin affect operation of the LTC3407EDD#PBF?
The MODE/SYNC pin on the LTC3407EDD#PBF serves dual functions: tying it to VIN selects Burst Mode® (maximizing light-load efficiency), tying it to GND selects pulse-skipping mode (minimizing output ripple), and applying an external 1.5MHz clock synchronizes switching while forcing pulse-skipping. The pin must never be left floating, as undefined states may cause erratic regulation or increased EMI.
What is the purpose of the POR pin on the LTC3407EDD#PBF?
The POR (Power-On Reset) pin on the LTC3407EDD#PBF is an open-drain output that pulls low whenever either regulated output deviates by more than ±8.5% from its target voltage. After both outputs stabilize within tolerance, a 262,144-cycle timer (~175ms) elapses before POR releases high - providing a reliable, capacitor-free reset signal for microcontrollers or FPGAs in portable systems powered by the LTC3407EDD#PBF.
Can the LTC3407EDD#PBF operate with a 2.5V input voltage?
Yes, the LTC3407EDD#PBF is fully specified to operate from 2.5V to 5.5V input. At 2.5V input, it supports output voltages down to 0.6V (via feedback divider) and maintains 100% duty-cycle dropout for VOUT ≤ 2.5V – (ILOAD × 0.35Ω). Efficiency remains >85% at 200mA load (VOUT = 1.8V), as verified in Figure 3407 G13 of the datasheet.
LTC3407EDD#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:
- 600mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3407EDD#PBF FAQ
1.How can I place an order for LTC3407EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407EDD#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#PBF reliable?
The price and inventory of LTC3407EDD#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3407EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407EDD#PBF?
LTC3407EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407EDD#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#PBF?
For technical support, including LTC3407EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407EDD#PBF requirements.
6.How does Aetrix verify that LTC3407EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3407EDD#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3407EDD#PBF?
All LTC3407EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407EDD#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#PBF part is unused and in its original packaging.
Return procedure for LTC3407EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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