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Analog Devices Inc. LTC3407AEDD#PBF
- Part No.:
- LTC3407AEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407AEDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:347
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Product details
Overview
LTC3407AEDD#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC converter optimized for low-power portable electronics. It operates from 2.5V to 5.5V input, delivers up to 600mA per channel, switches at a fixed 1.5MHz frequency, and supports adjustable output voltages from 0.6V to 5V - enabling compact designs in digital cameras and cellular handsets.
For engineers reviewing the LTC3407AEDD#PBF datasheet, LTC3407AEDD#PBF pinout, LTC3407AEDD#PBF application, or LTC3407AEDD#PBF equivalent, key selection criteria include its dual-channel 1.5MHz constant-frequency operation, 40μA quiescent current in active mode, Burst Mode® vs Pulse Skip Mode trade-off, integrated 0.35Ω P-channel top switches, and 3mm × 3mm DFN-10 package with exposed thermal pad.
Technical Context
The LTC3407AEDD#PBF implements a current-mode control architecture with shared 1.5MHz oscillator across both channels, enabling precise in-phase switching and stable transient response. Its dual error amplifiers compare feedback voltages (VFB1/VFB2) against a 0.6V reference to regulate each output independently, while overvoltage/undervoltage comparators feed into a common open-drain POR output.
Operation includes three distinct low-load regimes: continuous conduction mode (CCM), Burst Mode® (for peak efficiency at light loads with intermittent switching), and Pulse Skip Mode (for lowest output ripple at light loads with fixed-frequency skipping). The MODE/SYNC pin selects mode or accepts external synchronization signal, and dropout is supported via 100% duty cycle with P-channel MOSFETs 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 pre-regulation. |
| Switching Frequency | 1.5MHz (typ) - enables use of sub-1mm-height inductors and ceramic capacitors for ultra-thin portable designs. |
| Output Current per Channel | 600mA - sufficient for core logic rails (e.g., 1.8V/2.5V) in PDAs, modems, and camera modules. |
| Feedback Reference Voltage | 0.6V ±12mV - sets output voltage via external resistor divider; enables precise regulation down to 0.6V. |
| Quiescent Current | 40μA (both channels active) - extends battery runtime in always-on subsystems like standby processors or sensors. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep or power-off states. |
| Top Switch RDS(ON) | 0.35Ω (typ) - eliminates need for external Schottky diodes and improves full-load efficiency to 96%. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial portable equipment environments. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN with exposed thermal pad (Pin 11 = PGND). Requires soldering 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 resistive divider on VOUT1; regulates output by comparing to 0.6V internal reference. |
| RUN/SS1 (Pin 2) | Channel 1 enable & soft-start | Pull to VIN to enable; pull to GND to disable; RC network adds controlled voltage ramp for inrush limiting. |
| VIN (Pin 3) | Main power input | Supplies both regulators; requires local 10μF ceramic decoupling to minimize high-frequency noise. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND; layout critical for EMI and efficiency. |
| GND (Pin 5) | Analog and power ground | Reference for feedback, error amp, and POR; must tie to low-impedance ground plane near CIN/COUT. |
| MODE/SYNC (Pin 6) | Mode select & sync input | Tie to VIN for Burst Mode®; tie to GND for Pulse Skip Mode; apply external 1.5MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; independent inductor connection required for dual-output isolation. |
| POR (Pin 8) | Power-on reset output | Open-drain; pulls low if either VOUT deviates >±8.5%; releases after 65,536 clock cycles (~44ms in Pulse Skip). |
| RUN/SS2 (Pin 9) | Channel 2 enable & soft-start | Functionally identical to RUN/SS1; allows independent sequencing or shutdown of second regulator. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same 0.6V reference as VFB1; supports independent output voltage setting for dual-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes; achieves up to 96% efficiency at 600mA with integrated 0.35Ω/0.30Ω P/N switches. |
| Burst Mode® operation | Reduces quiescent current to 40μA while maintaining regulation; ideal for battery-powered standby circuits. |
| 100% duty-cycle dropout | Enables VOUT ≈ VIN – ILOAD×RDS(ON) operation when input drops near output voltage - critical for Li-ion end-of-discharge. |
| Externally synchronizable oscillator | Allows noise-sensitive systems (e.g., RF sections) to lock switching to a clean system clock, avoiding beat frequencies. |
| Power-On Reset (POR) with fault detection | Monitors both outputs continuously; asserts open-drain signal if either falls outside ±8.5%, supporting safe boot sequencing. |
| Thermally enhanced DFN package | 3mm × 3mm footprint with exposed PGND pad (θJA = 45°C/W); supports >600mA/channel in compact layouts. |
Applications
| Digital Camera Core Power | Cellular Phone Baseband |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.8V) and ISP (2.5V) in compact handheld cameras with tight height constraints. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing isolated, low-noise, high-efficiency DC/DC conversion with fast load transient response. Use Value: Enables use of 1mm-height inductors and ceramic caps; 1.5MHz switching avoids audible noise; 40μA IQ extends capture time between charges. | Use Scenario: Powering baseband processor (1.2V) and memory interface (1.8V) in GSM/UMTS handsets operating from single-cell Li-ion. IC Role / Device Role / Timing Role: Dual-channel step-down converter with independent enable and soft-start for sequenced power-up of SoC subsystems. Use Value: Burst Mode® extends talk time; POR output coordinates system reset with power-good assertion; DFN package fits narrow PCB margins. |
| Wireless Modem RF Front-End | PDA Application Processor Rail |
Use Scenario: Generating clean 3.3V and 1.8V supplies for RF transceiver and baseband ICs in DSL/wireless modems where EMI must be minimized. IC Role / Device Role / Timing Role: Synchronized dual buck regulator allowing MODE/SYNC pin to lock switching to system clock, eliminating heterodyne interference. Use Value: Pulse Skip Mode reduces output ripple to <35mVP-P; 1.5MHz frequency places harmonics beyond sensitive RF bands; low RDS(ON) minimizes thermal rise. | Use Scenario: Supplying core (1.2V) and I/O (3.3V) rails for ARM-based application processors in palm-sized PDAs with aggressive battery life targets. IC Role / Device Role / Timing Role: Dual adjustable buck regulator supporting dynamic voltage scaling and independent channel shutdown during low-power states. Use Value: 0.6V reference enables precise low-voltage regulation; 100% duty cycle maintains operation down to 2.5V input; <1μA shutdown current prevents battery drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | Single-channel, 600mA, 3MHz fixed-frequency; no Burst Mode®, only PWM/PFM; smaller 2mm × 2mm DFN-8 package. | Lacks dual-output capability and POR output; better suited for space-constrained single-rail designs. | Select when only one regulated rail is needed and higher switching frequency justifies trade-off in light-load efficiency. |
| RT8059GJ6 | Dual-channel, 600mA, 1.5MHz; uses external compensation; no integrated POR; 0.6V reference; 2.5V–5.5V input. | No power-on reset function; requires external circuitry for sequencing or fault monitoring; slightly higher IQ (60μA). | Choose when POR is not required and design flexibility via external compensation outweighs integrated simplicity. |
Compared with TPS62231DRYT and RT8059GJ6, the LTC3407AEDD#PBF uniquely combines dual independent 600mA channels, integrated POR, Burst Mode® optimization, and a thermally robust 3mm × 3mm DFN - making it optimal for compact, battery-sensitive dual-rail systems requiring guaranteed power-good signaling and minimal standby loss.
Availability
LTC3407AEDD#PBF is available at Aetrix Electronics and suitable for digital cameras, cellular handsets, and wireless modems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3407AEDD#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, serving precision instrumentation, communications, and power-conversion markets.
The LTC3407AEDD#PBF belongs to Linear's µPower DC/DC converter family, designed specifically for space- and energy-constrained portable electronics - emphasizing ultra-low quiescent current, small solution size, and robust dual-rail integration without external diodes.
FAQ
What is the maximum output current per channel for the LTC3407AEDD#PBF?
The LTC3407AEDD#PBF delivers up to 600mA per channel under typical conditions (VIN = 3.6V, VOUT = 1.8V, TA = 25°C). Actual achievable current depends on thermal design, input voltage, output voltage, and ambient temperature - with the 3mm × 3mm DFN package supporting sustained 600mA/channel when the exposed pad is properly soldered to a thermal plane.
Does the LTC3407AEDD#PBF require external Schottky diodes?
No, the LTC3407AEDD#PBF does not require external Schottky diodes. It integrates synchronous P-channel (0.35Ω typ) and N-channel (0.30Ω typ) MOSFETs per channel, enabling high-efficiency operation up to 96% while eliminating diode forward voltage drop and associated heat generation.
How does Burst Mode® operation improve efficiency in the LTC3407AEDD#PBF?
Burst Mode® operation in the LTC3407AEDD#PBF reduces light-load quiescent current to 40μA by disabling switching until output voltage droop triggers a burst of switching cycles. This minimizes gate charge losses and significantly extends battery life in standby or idle states - especially critical in always-on subsystems like real-time clocks or sensor interfaces.
Can the LTC3407AEDD#PBF be synchronized to an external clock?
Yes, the LTC3407AEDD#PBF can be synchronized to an external 1.5MHz clock applied to the MODE/SYNC pin (Pin 6). During synchronization, the device automatically enters Pulse Skip Mode and aligns the rising edge of its internal clock with the external signal - reducing EMI and avoiding beat frequencies in noise-sensitive applications such as RF front-ends.
What is the function of the POR pin on the LTC3407AEDD#PBF?
The POR (Power-On Reset) pin on the LTC3407AEDD#PBF is an open-drain output that remains low while either regulated output is outside ±8.5% of its target voltage. Once both outputs stabilize within tolerance, POR releases after 65,536 clock cycles (~44ms in Pulse Skip Mode), providing a reliable hardware reset signal for microcontrollers or FPGAs during system power-up.
LTC3407AEDD#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)
LTC3407AEDD#PBF FAQ
1.How can I place an order for LTC3407AEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407AEDD#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 LTC3407AEDD#PBF reliable?
The price and inventory of LTC3407AEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3407AEDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3407AEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407AEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407AEDD#PBF?
LTC3407AEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407AEDD#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 LTC3407AEDD#PBF?
For technical support, including LTC3407AEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407AEDD#PBF requirements.
6.How does Aetrix verify that LTC3407AEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3407AEDD#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 LTC3407AEDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3407AEDD#PBF?
All LTC3407AEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407AEDD#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 LTC3407AEDD#PBF part is unused and in its original packaging.
Return procedure for LTC3407AEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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