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Analog Devices Inc. LTC3407EDD-2#TRPBF
- Part No.:
- LTC3407EDD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407EDD-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,431
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Product details
Overview
LTC3407EDD-2#TRPBF from Analog Devices is a dual synchronous step-down DC/DC regulator optimized for low-power portable systems. It delivers up to 800mA per channel from a 2.5V–5.5V input, operates at a fixed 2.25MHz switching frequency, and supports adjustable output voltages from 0.6V to 5V. Its internal 0.35Ω P-channel and 0.30Ω N-channel MOSFETs enable high-efficiency operation without external Schottky diodes-used in digital cameras, cellular phones, and PC cards.
For engineers reviewing the LTC3407EDD-2#TRPBF datasheet, LTC3407EDD-2#TRPBF pinout, LTC3407EDD-2#TRPBF application, or LTC3407EDD-2#TRPBF equivalent, key selection criteria include its dual-channel 2.25MHz constant-frequency architecture, Burst Mode® vs pulse-skipping mode trade-off, 40µA quiescent current, 100% duty-cycle dropout capability, and DFN-10 (3mm × 3mm) thermal performance with exposed PGND pad.
Technical Context
The LTC3407EDD-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 features independent RUN enable inputs, dedicated VFB pins with 0.6V reference, and integrated power switches with matched RDS(ON) (0.35Ω top / 0.30Ω bottom).
Its MODE/SYNC pin serves dual functions: selecting between Burst Mode® (for ≤40µA IQ at light loads) and pulse-skipping mode (for low-noise operation), or synchronizing to an external clock. The POR output provides open-drain power-on reset with ±8.5% voltage monitoring and 117ms delay after regulation is achieved.
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 | 2.25MHz (typ) - enables use of ultra-small 2.2µH inductors and 10µF ceramic capacitors with ≤1.2mm profile. |
| Output Current per Channel | 800mA - sufficient for core logic, memory, and interface ICs in handheld devices. |
| Feedback Reference Voltage | 0.6V ±12mV - sets output via resistor divider; enables precise 1.2V, 1.8V, 2.5V, 3.3V rails with minimal divider current. |
| Quiescent Current | 40µA (total, both channels) - extends battery runtime in always-on subsystems like RTC or sensor monitoring. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or storage modes. |
| Peak Switch Current Limit | 1.2A (typ) - provides robust short-circuit protection while supporting peak load transients. |
| Operating Temperature Range | –40°C to +85°C - qualified for commercial and industrial portable equipment environments. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed PGND pad (Pin 11), thermally enhanced for 45°C/W θJA. Requires solder connection of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider; regulates VOUT1 to 0.6V reference - sets output voltage via R1/R2 ratio. |
| RUN1 (Pin 2) | Channel 1 enable control | Active-high logic: tie to VIN to enable, GND to disable - supports independent power sequencing. |
| VIN (Pin 3) | Main power input | Supplies both regulators; requires local 10µF ceramic decoupling to minimize high-frequency noise injection. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND - critical for EMI layout; keep trace short and direct. |
| GND (Pin 5) | Analog ground reference | Separate from PGND; connects to quiet analog ground plane - shields error amplifier from switching noise. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode®, GND for pulse-skipping, or apply external 2.25MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; must be routed symmetrically to SW1 for balanced thermal and EMI performance. |
| POR (Pin 8) | Power-on reset output | Open-drain signal pulled low if either VOUT deviates >±8.5%; releases after ~117ms in regulation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for second regulator - enables staggered startup or dynamic channel disabling. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1; allows independent output voltage programming for dual-rail systems. |
| PGND (Pin 11) | Power ground return | Exposed pad - must be soldered to large PCB ground plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes; achieves up to 95% efficiency at 800mA with integrated 0.35Ω/0.30Ω MOSFETs. |
| Burst Mode® operation | Reduces total quiescent current to 40µA while maintaining regulation - ideal for battery-backed standby circuits. |
| 100% duty-cycle dropout | Enables VOUT ≈ VIN − ILOAD×RDS(ON) during brownout - preserves functionality down to ~2.5V input on 2.5V rail. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin - eliminates beat frequencies in multi-converter systems. |
| Power-on reset with timeout | Generates system-ready signal only after both outputs stabilize within ±8.5% for ≥117ms - prevents premature MCU boot. |
| AEC-Q100 qualified variants available | Automotive-grade versions (e.g., LTC3407EMSE-2#WPBF) support harsh environment requirements - though LTC3407EDD-2#TRPBF is commercial grade. |
Applications
| Digital Camera Power Management | Cellular Phone Baseband Core |
|---|---|
Use Scenario: Dual-rail supply for image sensor (1.8V) and ISP processor (2.5V) in compact camera modules. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator delivering regulated, low-noise power with fast transient response to handle burst capture loads. Use Value: 2.25MHz switching enables <1.2mm height design; Burst Mode® extends battery life during preview mode with sub-100µA system sleep current. | Use Scenario: Independent voltage rails for application processor core (1.2V) and memory interface (3.3V) in 4G LTE handsets. IC Role / Device Role / Timing Role: Dual synchronous buck converter providing sequenced, efficient power with POR coordination for safe SoC boot. Use Value: 40µA quiescent current minimizes leakage during deep-sleep states; 100% duty cycle maintains core voltage during RF transmit brownout events. |
| Portable Media Player Audio Codec | PC Card Interface Supply |
Use Scenario: Clean, low-ripple 3.3V and 1.8V supplies for high-fidelity audio DAC and SDIO controller in MP3 players. IC Role / Device Role / Timing Role: Dual-channel regulator operating in pulse-skipping mode to suppress switching noise near sensitive analog audio paths. Use Value: Pin-selectable low-noise mode reduces output ripple to <10mVpp, preventing audible artifacts in headphone output. | Use Scenario: Compact, low-profile power solution for PCMCIA/CardBus peripherals requiring isolated 3.3V and 5V-compatible rails. IC Role / Device Role / Timing Role: Dual buck regulator supplying host-side interface logic (3.3V) and card detection circuitry (1.8V) from shared 5V bus. Use Value: DFN-10 package fits tight card-edge space constraints; 2.25MHz operation avoids interference with 33MHz CardBus timing. |
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 |
|---|---|---|---|
| TPS62125DSGR | Single-channel, 3MHz fixed-frequency buck; 0.6V ref; 95% eff; 17µA IQ; 2.7–5.5V input. | Requires two separate ICs for dual-rail designs; lacks POR, MODE/SYNC, and independent RUN controls. | Select when single-rail simplicity and ultra-low IQ outweigh need for integration and sequencing features. |
| RT8059NGSP | Dual-channel, 1.5MHz buck; 0.6V ref; 92% eff; 60µA IQ; 2.5–5.5V input; no Burst Mode® or POR. | Lower switching frequency demands larger magnetics; no power-good signaling or programmable light-load modes. | Select when cost sensitivity dominates and 1.5MHz operation meets size/EMI targets without advanced control features. |
Compared with TPS62125DSGR and RT8059NGSP, the LTC3407EDD-2#TRPBF uniquely integrates dual independent regulators with Burst Mode®, POR, and MODE/SYNC flexibility in a 3mm × 3mm DFN - enabling smaller BOM count, tighter sequencing control, and longer battery life in space-constrained portable systems.
Availability
LTC3407EDD-2#TRPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and portable media players requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LTC3407EDD-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 power management markets.
The LTC3407-2 product line delivers highly integrated, high-frequency dual buck regulators for battery-powered portable electronics - designed to minimize board area, maximize efficiency at light loads, and simplify power architecture in space- and energy-constrained devices.
FAQ
What is the maximum output current per channel for the LTC3407EDD-2#TRPBF?
The LTC3407EDD-2#TRPBF supports up to 800mA continuous output current per channel under typical thermal conditions (TA = 25°C, 2-layer PCB, exposed PGND pad soldered). Peak switch current limit is 1.2A, allowing brief transients beyond 800mA. Derating is required at elevated ambient temperatures or with limited airflow - full 800mA per channel is achievable with proper thermal design using the DFN-10 package's exposed pad.
Does the LTC3407EDD-2#TRPBF require external Schottky diodes?
No, the LTC3407EDD-2#TRPBF does not require external Schottky diodes. It integrates synchronous P-channel (0.35Ω) and N-channel (0.30Ω) MOSFETs per channel, eliminating conduction losses and heat generation associated with external diodes. This improves efficiency - up to 95% at 800mA - and simplifies layout by reducing component count and board area.
How does Burst Mode® operation affect the output voltage ripple of the LTC3407EDD-2#TRPBF?
Burst Mode® operation increases low-load output voltage ripple compared to pulse-skipping mode because it disables switching intermittently - causing periodic energy bursts into the output capacitor. Ripple can reach 20–50mVpp depending on load and output capacitance. For noise-sensitive analog circuits, pulse-skipping mode (selected by grounding MODE/SYNC) maintains constant 2.25MHz switching and reduces ripple to <10mVpp, at the cost of higher light-load quiescent current (~60µA vs 40µA).
Can the LTC3407EDD-2#TRPBF operate with input voltage below 2.5V?
No, the LTC3407EDD-2#TRPBF has a minimum specified input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V may cause unstable regulation, failure to start, or undefined behavior. An undervoltage lockout circuit disables the device below ~1.65V, but reliable operation is only guaranteed from 2.5V to 5.5V. For sub-2.5V inputs, consider alternative regulators such as the LTC3522 or TPS6223x series.
What is the purpose of the exposed pad (Pin 11) on the LTC3407EDD-2#TRPBF DFN package?
The exposed pad (Pin 11) on the LTC3407EDD-2#TRPBF is designated PGND - Power Ground - and must be soldered to a large PCB copper area connected to system ground. It serves two critical functions: (1) thermal dissipation, reducing θJA from 45°C/W to ~30°C/W with adequate copper; and (2) low-impedance return path for high-frequency switch currents, minimizing noise coupling and improving EMI performance. Leaving it unconnected degrades efficiency, thermal margin, and stability.
LTC3407EDD-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3407EDD-2#TRPBF FAQ
1.How can I place an order for LTC3407EDD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407EDD-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 LTC3407EDD-2#TRPBF reliable?
The price and inventory of LTC3407EDD-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 LTC3407EDD-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3407EDD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407EDD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407EDD-2#TRPBF?
LTC3407EDD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407EDD-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 LTC3407EDD-2#TRPBF?
For technical support, including LTC3407EDD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407EDD-2#TRPBF requirements.
6.How does Aetrix verify that LTC3407EDD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3407EDD-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 LTC3407EDD-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3407EDD-2#TRPBF?
All LTC3407EDD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407EDD-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 LTC3407EDD-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3407EDD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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