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Analog Devices Inc. LTC3407AIDD-2#TRPBF
- Part No.:
- LTC3407AIDD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407AIDD-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,169
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Product details
Overview
LTC3407AIDD-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC converter designed for low-power portable systems. It operates from 2.5V to 5.5V input, delivers up to 800mA per channel, features 2.25MHz fixed-frequency switching, 0.6V feedback reference, and supports independent enable/soft-start (RUN/SS1 & RUN/SS2) for power sequencing in battery-powered digital cameras and cellular handsets.
For engineers reviewing the LTC3407AIDD-2#TRPBF datasheet, LTC3407AIDD-2#TRPBF pinout, LTC3407AIDD-2#TRPBF application, or LTC3407AIDD-2#TRPBF equivalent, this page provides verified package mapping (10-lead 3mm × 3mm DFN), confirmed thermal specs (–40°C to 125°C), validated dual-output regulation behavior, and real-world efficiency trade-offs between Burst Mode (95% peak, <35mVPk-Pk) and Pulse Skip Mode (low-noise operation).
Technical Context
The LTC3407AIDD-2#TRPBF implements a constant-frequency current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling precise phase alignment and simplified EMI filtering. Its dual P-channel/N-channel synchronous MOSFETs (RDS(ON) = 0.35Ω / 0.30Ω) eliminate external Schottky diodes while supporting 100% duty-cycle dropout operation.
Operation is configurable via MODE/SYNC pin: tied to VIN enables Burst Mode (40μA IQ, high light-load efficiency); tied to GND selects Pulse Skip Mode (lowest output ripple at light loads). The POR pin provides open-drain power-on reset with ±8.5% output voltage monitoring and 65,536-cycle delay (~29ms at 2.25MHz).
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 regulators. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-3mm-height inductors (e.g., 2.2μH) and compact 10μF ceramic capacitors. |
| Output Voltage Range | 0.6V to 5V (adjustable per channel) - set by external resistor divider; 0.6V feedback reference allows low-VOUT generation for core logic rails. |
| Max Output Current | 800mA per channel - sustained delivery with internal 1.2A peak switch current limit (ILIM) and thermal shutdown protection. |
| Quiescent Current | 40μA (Burst Mode, both channels active) - extends battery runtime in standby; <1μA in shutdown. |
| Efficiency | Up to 95% at 800mA - achieved via synchronous rectification, low RDS(ON) switches, and optimized gate drive. |
| Operating Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial edge computing applications. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = PGND). Thermally enhanced layout requires soldering exposed pad to PCB ground plane for θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Regulator 1 feedback input | Monitors divided output voltage; 0.6V reference sets VOUT1 = 0.6V × (1 + R1/R2); ≤30nA input bias minimizes divider current loss. |
| RUN/SS1 (Pin 2) | Regulator 1 enable & soft-start control | Active-high enable (VTH = 1V min); RC network on this pin controls ramp rate of VOUT1 during startup. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling; absolute max = 6V. |
| SW1 (Pin 4) | Regulator 1 switch node | Connects to inductor L1; swings from GND to VIN; high dv/dt demands tight layout and Kelvin connection to minimize ringing. |
| GND (Pin 5) | Main signal ground | Reference for error amplifier, POR, and MODE/SYNC; must be low-impedance star point connected to CIN/COUT negatives. |
| MODE/SYNC (Pin 6) | Mode selection & external sync input | Configures Burst Mode (VIN), Pulse Skip (GND), or synchronizes to external clock (2.25MHz); no floating allowed. |
| SW2 (Pin 7) | Regulator 2 switch node | Identical function to SW1; independent inductor connection required; both SW pins share same switching phase. |
| POR (Pin 8) | Power-on reset open-drain output | Pulled low if either VOUT deviates >±8.5%; releases after 65,536 clock cycles once both outputs are in regulation. |
| RUN/SS2 (Pin 9) | Regulator 2 enable & soft-start control | Independent control of second channel; identical electrical behavior to RUN/SS1. |
| VFB2 (Pin 10) | Regulator 2 feedback input | Independent 0.6V reference path; allows different VOUT1 and VOUT2 settings using separate resistor dividers. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diodes required | Synchronous N-channel bottom switch (0.30Ω RDS(ON)) replaces lossy discrete diode, improving efficiency by 3–5% at medium loads. |
| Burst Mode operation | Reduces IQ to 40μA at light loads while maintaining regulation; ideal for always-on subsystems like RTC or sensor interfaces. |
| Externally synchronizable oscillator | Eliminates beat frequencies in multi-regulator systems; MODE/SYNC pin accepts 2.25MHz external clock to force Pulse Skip Mode and align switching edges. |
| Power-On Reset (POR) with fault detection | Open-drain POR asserts low if either output falls outside ±8.5% window; provides system-level power-good signaling without external comparators. |
| 100% duty-cycle dropout operation | P-channel top switch remains fully on when VIN ≤ VOUT + ILOAD × RDS(ON), enabling seamless transition to linear mode during brownout. |
Applications
| Digital Camera Power Management | Cellular Handset Core Rail Generation |
|---|---|
|
Use Scenario: Dual-rail power for CMOS image sensor (1.8V) and baseband processor (2.5V) in compact handheld camera modules. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing independently sequenced, low-noise, high-efficiency DC/DC conversion with integrated POR for system reset coordination. Use Value: Enables use of 2.2μH inductors and 10μF ceramic caps per rail, reducing solution footprint by >40% vs. legacy 500kHz converters. |
Use Scenario: Generating 1.2V core and 2.8V I/O rails from single Li-ion battery in 3G/4G mobile handsets. IC Role / Device Role / Timing Role: Dual-channel step-down regulator with independent RUN/SS pins allowing staggered power-up to limit inrush current during cold start. Use Value: Burst Mode extends talk time by minimizing quiescent loss during idle periods; 125°C rating supports placement near RF power amplifiers. |
| Wireless Modem Baseband Supply | Industrial IoT Sensor Node Power |
|
Use Scenario: Powering LTE/Wi-Fi baseband SoC requiring tightly regulated 1.1V and 3.3V supplies in space-constrained M.2 modules. IC Role / Device Role / Timing Role: High-frequency dual buck converter delivering fast transient response (<10μs recovery) to handle bursty data transmission loads. Use Value: 2.25MHz operation avoids AM/FM radio bands; Pulse Skip Mode ensures clean supply during sensitive receive windows. |
Use Scenario: Battery-powered environmental sensor node needing long-term operation with ultra-low sleep current and robust brownout handling. IC Role / Device Role / Timing Role: Dual-output regulator with <1μA shutdown current, 100% duty-cycle dropout, and –40°C to 125°C operation for outdoor deployment. Use Value: Eliminates need for external LDOs or supervisors; POR output directly drives microcontroller reset pin for reliable cold-boot recovery. |
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 buck; 2.5V–6V input; 3.5MHz switching; no POR or dual outputs. | Requires two ICs for dual-rail designs; higher frequency enables smaller passives but increases EMI risk. | Select when higher per-channel current (>800mA) or tighter size constraints outweigh need for integrated dual control. |
| MAX17504ATP+T | Dual-channel, 600mA/channel, 4.5V–36V input, 400kHz–2.2MHz programmable frequency; no integrated POR. | Wider input range suits 12V industrial rails; lower switching frequency increases inductor size but eases EMI filtering. | Select for wide-input industrial applications where 2.25MHz is unnecessary and extended VIN range is critical. |
Compared with LTC3407AIDD-2#TRPBF, TPS62130ARGTR offers higher single-channel current but lacks dual-output integration and POR, while MAX17504ATP+T supports wider input voltage and programmable frequency but trades off light-load efficiency and compactness for ruggedness.
Availability
LTC3407AIDD-2#TRPBF is available at Aetrix Electronics and suitable for digital camera power management, cellular handset core rail generation, wireless modem baseband supply, and industrial IoT sensor node power requiring stable component supply across automotive and extended-temperature industrial programs.
Supply support for LTC3407AIDD-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3407A series belongs to Linear's high-frequency synchronous buck regulator product line, engineered specifically for space-constrained, battery-powered portable electronics demanding ultra-low quiescent current, dual-rail flexibility, and robust thermal performance.
FAQ
What is the maximum junction temperature and thermal resistance of the LTC3407AIDD-2#TRPBF?
The LTC3407AIDD-2#TRPBF has a maximum junction temperature (TJMAX) of 125°C, with thermal resistance θJA = 45°C/W and θJC = 10°C/W when the exposed pad (Pin 11) is properly soldered to a PCB ground plane. These values are measured under standard JEDEC 51-7 conditions and assume adequate copper area for heat spreading.
Does the LTC3407AIDD-2#TRPBF support independent voltage setting for each output channel?
Yes, the LTC3407AIDD-2#TRPBF supports independent voltage setting via separate feedback resistive dividers on VFB1 and VFB2 pins. Each channel uses the same 0.6V internal reference, so VOUT1 = 0.6V × (1 + R1/R2) and VOUT2 = 0.6V × (1 + R3/R4), enabling asymmetric rail generation such as 1.2V/2.5V or 1.8V/3.3V.
How does the MODE/SYNC pin affect operation of the LTC3407AIDD-2#TRPBF?
The MODE/SYNC pin on the LTC3407AIDD-2#TRPBF selects between Burst Mode (pin tied to VIN), Pulse Skip Mode (pin tied to GND), or external synchronization (2.25MHz clock applied). In Burst Mode, the LTC3407AIDD-2#TRPBF achieves 40μA quiescent current but higher output ripple; Pulse Skip Mode maintains constant frequency for lowest noise.
What is the purpose and behavior of the POR pin on the LTC3407AIDD-2#TRPBF?
The POR (Power-On Reset) pin on the LTC3407AIDD-2#TRPBF is an open-drain output that pulls low when either output voltage deviates beyond ±8.5% of its target. Once both channels stabilize within regulation, a 65,536-cycle timer starts; upon expiry, POR goes high. If either channel shuts down, POR reasserts low - ensuring system reset integrity throughout power sequencing.
Can the LTC3407AIDD-2#TRPBF operate with only one channel enabled?
Yes, the LTC3407AIDD-2#TRPBF supports single-channel operation: tie RUN/SS1 to GND to disable Channel 1 while keeping Channel 2 active (or vice versa). When one channel is disabled, the LTC3407AIDD-2#TRPBF maintains full functionality on the active channel, including Burst Mode, soft-start, and POR assertion based on the enabled output's regulation status.
LTC3407AIDD-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)
LTC3407AIDD-2#TRPBF FAQ
1.How can I place an order for LTC3407AIDD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407AIDD-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 LTC3407AIDD-2#TRPBF reliable?
The price and inventory of LTC3407AIDD-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 LTC3407AIDD-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3407AIDD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407AIDD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407AIDD-2#TRPBF?
LTC3407AIDD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407AIDD-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 LTC3407AIDD-2#TRPBF?
For technical support, including LTC3407AIDD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407AIDD-2#TRPBF requirements.
6.How does Aetrix verify that LTC3407AIDD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3407AIDD-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 LTC3407AIDD-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3407AIDD-2#TRPBF?
All LTC3407AIDD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407AIDD-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 LTC3407AIDD-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3407AIDD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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