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Analog Devices Inc. LTC3407IDD-2#TRPBF
- Part No.:
- LTC3407IDD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407IDD-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,146
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Product details
Overview
LTC3407IDD-2#TRPBF from Analog Devices is a dual synchronous step-down DC/DC regulator delivering up to 800mA per channel, operating from 2.5V to 5.5V input and featuring fixed 2.25MHz switching frequency, internal 0.35Ω P-channel and 0.30Ω N-channel MOSFETs, and adjustable output voltages from 0.6V to 5V - used in space-constrained portable power rails for digital cameras and cellular handsets.
For engineers reviewing the LTC3407IDD-2#TRPBF datasheet, LTC3407IDD-2#TRPBF pinout, LTC3407IDD-2#TRPBF application, or LTC3407IDD-2#TRPBF equivalent, key selection criteria include its dual-channel 2.25MHz constant-frequency operation, Burst Mode® vs pulse-skipping mode trade-off, 40µA quiescent current, 100% duty-cycle dropout capability, and thermally enhanced 3mm × 3mm DFN package with exposed PGND pad.
Technical Context
The LTC3407IDD-2#TRPBF 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 1.2A peak switch current per channel.
Its MODE/SYNC pin provides dual functionality: selecting between Burst Mode® (for ≤40µA IQ at light loads) and pulse-skipping mode (for low-noise ripple), or synchronizing to an external clock. The device includes a power-on reset (POR) output with ±8.5% voltage monitoring and 117ms delay, and operates over –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Switching Frequency | 2.25MHz (typ) - enables use of 2.2µH inductors and 10µF ceramic capacitors with ≤1.2mm profile for ultra-thin designs. |
| Output Current per Channel | 800mA continuous - sufficient for core logic, I/O, or memory rails in portable SoC applications. |
| Feedback Reference Voltage | 0.6V (±2%) - sets output via resistor divider; allows precise 0.6V–5V adjustment with minimal divider current (≤30nA). |
| Quiescent Current | 40µA (total, both channels active) - extends battery runtime in always-on subsystems like modem standby or sensor hubs. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or transport storage. |
| Thermal Range | –40°C to +125°C (junction) - qualified for automotive under-hood and industrial edge computing environments. |
Pinout & Package
Package: 10-lead, 3mm × 3mm plastic DFN with exposed power ground (PGND) pad (Pin 11), thermally enhanced for θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider; regulates VOUT1 to 0.6V reference - determines output accuracy and loop stability. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enable; low = shutdown - supports independent sequencing and dynamic power gating of rail 1. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10µF ceramic decoupling to minimize high-frequency noise injection. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND - critical for EMI layout; must be short and low-inductance. |
| GND (Pin 5) | Analog ground reference | Separate from PGND; connects to feedback divider ground and error amplifier reference - isolates noise-sensitive analog circuitry. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode®; tie to GND for pulse-skipping; apply external 2.25MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; shares same clock phase - enables tightly coupled dual-rail generation with minimal skew. |
| POR (Pin 8) | Power-on reset open-drain output | Pulled low if either VOUT deviates >±8.5%; releases after 262,144 cycles (~117ms) - used for system processor reset timing. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for rail 2 - allows staggered startup or fault-isolated shutdown. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1; supports independent output voltage setting for asymmetric dual-rail configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes and reduces conduction losses - achieves up to 95% efficiency at 800mA with 2.2µH inductors. |
| Burst Mode® operation | Reduces total quiescent current to 40µA while maintaining regulation - ideal for battery-powered standby modes in handheld devices. |
| 100% duty-cycle dropout | Enables seamless transition to linear regulation when VIN approaches VOUT - preserves output during brown-out without reset or dropout. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin - eliminates beat frequencies in multi-regulator systems and simplifies EMI filtering. |
| Power-on reset with timeout | Monitors both outputs simultaneously and asserts POR until both are within ±8.5% for ≥117ms - ensures reliable microcontroller initialization. |
Applications
| Digital Camera Power Management | Cellular Phone Baseband Supply |
|---|---|
Use Scenario: Dual-rail power for CMOS image sensor (1.8V) and ISP core (2.5V) in compact camera modules. IC Role / Device Role / Timing Role: Primary dual-output DC/DC converter providing independently regulated, low-noise, high-efficiency supplies synchronized to imaging frame timing. Use Value: 2.25MHz switching avoids interference with image sensor sampling clocks; Burst Mode® extends battery life during preview mode. |
Use Scenario: Powering baseband processor (1.2V) and RF transceiver I/O (2.8V) in LTE smartphones with tight PCB height constraints. IC Role / Device Role / Timing Role: Dual-channel step-down regulator delivering stable, sequenced supplies with minimal footprint and thermal rise. Use Value: 3mm × 3mm DFN package fits beneath display flex; 100% duty-cycle operation sustains VOUT during Li-ion discharge down to 2.8V. |
| Portable Media Player Audio Codec | Industrial Handheld Terminal |
Use Scenario: Generating clean 1.8V digital and 3.3V analog supplies for high-fidelity audio codec ICs in MP3 players. IC Role / Device Role / Timing Role: Dual-output regulator with pulse-skipping mode selected to minimize output ripple affecting DAC performance. Use Value: <10mVpp ripple at light loads ensures SNR >95dB; independent RUN pins allow audio subsystem power gating during pause. |
Use Scenario: Powering ARM Cortex-M7 MCU (1.1V), Ethernet PHY (3.3V), and LCD backlight driver (5V) in ruggedized field terminals. IC Role / Device Role / Timing Role: High-reliability dual buck regulator rated for –40°C to +125°C operation with AEC-Q100-aligned process. Use Value: 125°C junction rating supports sealed enclosures; POR output coordinates safe boot sequence across multiple voltage domains. |
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 |
|---|---|---|---|
| TPS62130ARGTR | Single-channel, 3A output, 2.5V–6V input, 2.5MHz switching - lacks second channel and POR output. | Requires two ICs for dual-rail; no integrated power-on reset signal for system coordination. | Choose when higher per-channel current (>800mA) is needed and dual-rail sequencing is handled externally. |
| MAX17504ATP+T | Dual-channel, 1A/channel, 4.5V–60V input, 400kHz–2.2MHz programmable frequency - wider VIN but lower switching frequency. | Needs larger magnetics; not optimized for sub-3mm height; no Burst Mode® for ultra-low IQ. | Prefer for industrial 24V input systems where size is secondary to input voltage range and robustness. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3407IDD-2#TRPBF uniquely delivers dual 800mA outputs in a 3mm × 3mm DFN with integrated POR, Burst Mode®, and 2.25MHz operation - making it optimal for compact, battery-sensitive dual-rail applications requiring coordinated reset and minimal board area.
Availability
LTC3407IDD-2#TRPBF is available at Aetrix Electronics and suitable for digital camera power management, cellular phone baseband supply, portable media player audio codec, and industrial handheld terminal applications requiring stable component supply across automotive and extended-temperature production programs.
Supply support for LTC3407IDD-2#TRPBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3407-2 product line delivers compact, high-frequency dual buck regulators targeting portable and space-constrained applications where efficiency, low IQ, and thermal performance are critical - especially in battery-powered consumer and automotive electronics.
FAQ
What is the maximum output current per channel for the LTC3407IDD-2#TRPBF?
The LTC3407IDD-2#TRPBF delivers up to 800mA continuous output current per channel under typical thermal conditions (θJA = 45°C/W, ambient ≤85°C). Peak switch current is rated at 1.2A, supporting transient loads. Derating is required above 85°C ambient or with poor PCB copper area; full 800mA is achievable with proper thermal design using the exposed PGND pad.
Does the LTC3407IDD-2#TRPBF support independent voltage setting for each output?
Yes, the LTC3407IDD-2#TRPBF supports fully independent output voltage programming via separate feedback dividers on VFB1 and VFB2 pins. Each channel uses the same 0.6V internal reference, allowing outputs to be set from 0.6V to 5V using standard resistor ratios - enabling asymmetric rails such as 1.2V/3.3V or 1.8V/2.5V without additional components.
How does Burst Mode® operation affect the output voltage ripple of the LTC3407IDD-2#TRPBF?
In Burst Mode®, the LTC3407IDD-2#TRPBF reduces switching activity at light loads, causing higher peak-to-peak output voltage ripple (typically 20–50mVpp depending on output capacitor ESR and value) compared to pulse-skipping mode (<10mVpp). This trade-off enables quiescent current as low as 40µA - ideal for standby but unsuitable for noise-sensitive analog circuits unless filtered externally.
Can the LTC3407IDD-2#TRPBF operate with input voltage below 2.5V?
No, the LTC3407IDD-2#TRPBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V risks undervoltage lockout activation or unstable regulation. For sub-2.5V inputs, consider the LTC3407-1 variant or alternative regulators such as the LTC3522, which supports 1.8V–5.5V input.
What is the purpose of the exposed pad (Pin 11) on the LTC3407IDD-2#TRPBF DFN package?
The exposed pad (Pin 11) on the LTC3407IDD-2#TRPBF is designated PGND (power ground) and must be soldered to a large PCB copper pour connected to system ground. It serves as the primary thermal path (θJC = 10°C/W) and low-impedance return for high-current switch node currents - omitting or undersizing this connection degrades efficiency, increases junction temperature, and may trigger thermal shutdown.
LTC3407IDD-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3407IDD-2#TRPBF FAQ
1.How can I place an order for LTC3407IDD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407IDD-2#TRPBF 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 LTC3407IDD-2#TRPBF reliable?
The price and inventory of LTC3407IDD-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3407IDD-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3407IDD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407IDD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407IDD-2#TRPBF?
LTC3407IDD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407IDD-2#TRPBF 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 LTC3407IDD-2#TRPBF?
For technical support, including LTC3407IDD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407IDD-2#TRPBF requirements.
6.How does Aetrix verify that LTC3407IDD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3407IDD-2#TRPBF 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 LTC3407IDD-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3407IDD-2#TRPBF?
All LTC3407IDD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407IDD-2#TRPBF, 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 LTC3407IDD-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3407IDD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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