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Analog Devices Inc. LTC3407EDD-4#TRPBF
- Part No.:
- LTC3407EDD-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3407EDD-4#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,563
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Product details
Overview
LTC3407EDD-4#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous step-down DC/DC converter optimized for low-power portable systems. It operates from 2.5V to 5.5V input, delivers up to 800mA per channel, switches at a fixed 2.25MHz frequency, and supports adjustable output voltages from 0.6V to 5V - enabling compact designs in PDAs, digital cameras, and cellular handsets using ≤1mm-profile inductors and ceramic capacitors.
For engineers reviewing the LTC3407EDD-4#TRPBF datasheet, LTC3407EDD-4#TRPBF pinout, LTC3407EDD-4#TRPBF application, or LTC3407EDD-4#TRPBF equivalent, key selection considerations include its dual-channel 2.25MHz constant-frequency operation, 0.35Ω internal P-channel MOSFET RDS(ON), 40μA quiescent current in active mode, Burst Mode® vs pulse-skipping mode selection via MODE/SYNC, and integrated power-on reset with ±8.5% threshold.
Technical Context
The LTC3407EDD-4#TRPBF employs a current-mode, constant-frequency architecture with shared 2.25MHz clock across both channels operating in-phase. Each regulator integrates matched 0.35Ω P-channel high-side and 0.30Ω N-channel synchronous rectifier switches, eliminating external Schottky diodes while supporting 100% duty-cycle dropout operation.
Its MODE/SYNC pin serves triple function: selecting Burst Mode® (for <40μA IQ at light load) or pulse-skipping mode (for low-noise ripple), and synchronizing to an external 2.25MHz clock. The POR output asserts low when either VOUT deviates >±8.5% from regulation and releases after 216 clock cycles (~29ms in pulse-skipping mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, or 3.3V/5V rail inputs without pre-regulation. |
| Switching Frequency | 2.25MHz (typ) - enables use of 2.2μH inductors and 10μF ceramic capacitors with ≤1mm height. |
| Output Current per Channel | 800mA continuous - sufficient for core logic, memory, and I/O rails in handheld devices. |
| Feedback Reference Voltage | 0.6V ±1.2% (–40°C to 85°C) - sets output via external resistor divider; enables precise 1.8V, 2.5V, 3.3V, etc. |
| Quiescent Current | 40μA total (both channels active) - extends battery runtime in always-on subsystems. |
| Shutdown Current | <1μA - minimizes leakage during system sleep or storage. |
| Power-On Reset Threshold | ±8.5% output voltage window - provides reliable system initialization timing with 29ms delay. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = PGND). Requires soldering 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 resistor divider on VOUT1; regulates output by comparing to 0.6V reference. |
| RUN1 (Pin 2) | Channel 1 enable control | Drive high to enable Reg1; drive low to shut down Reg1 - no floating allowed. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling to GND. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND; layout critical for EMI control. |
| GND (Pin 5) | Analog ground reference | Provides signal return for feedback and control circuits; separate from PGND path. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode®; tie to GND for pulse-skipping; apply 2.25MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Connects to inductor L2; identical behavior to SW1; must be routed symmetrically. |
| POR (Pin 8) | Open-drain power-on reset | Pulls low if either VOUT outside ±8.5%; releases after 216 clock cycles once both regulated. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for Reg2; same logic as RUN1 - essential for staggered power sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Identical function to VFB1; allows independent output voltage setting per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous switching | Eliminates external Schottky diodes; achieves up to 95% efficiency at 800mA with 0.35Ω/0.30Ω internal MOSFETs. |
| Burst Mode® operation | Reduces total quiescent current to 40μA while maintaining regulation - ideal for standby power domains. |
| 100% duty-cycle dropout | Enables VOUT ≈ VIN – ILOAD×RDS(ON) during brownout; sustains output as input drops to ~1.8V. |
| Externally synchronizable oscillator | Accepts 2.25MHz clock on MODE/SYNC to eliminate beat frequencies in multi-regulator systems. |
| Integrated power-on reset | Single POR output monitors both channels; eliminates need for discrete supervisor IC in space-constrained designs. |
Applications
| Mobile Handset Power Management | Digital Camera Core Supply |
|---|---|
|
Use Scenario: Dual-rail power for baseband processor (1.8V) and RF transceiver (2.5V) in GSM/UMTS handset. IC Role / Device Role / Timing Role: Primary dual-output buck regulator providing sequenced, low-noise, high-efficiency DC/DC conversion from single Li-ion cell. Use Value: 2.25MHz switching allows ultra-compact 2.2μH inductors and 10μF ceramic caps - reducing board area by >40% vs lower-frequency alternatives. |
Use Scenario: Independent 1.2V core and 2.8V sensor/I/O supplies in compact digital still camera. IC Role / Device Role / Timing Role: Dual synchronous buck controller managing transient-heavy imaging loads with fast load-step response. Use Value: Current-mode control ensures stable regulation during rapid flash LED current surges without external compensation. |
| Portable Media Player SoC Rails | PDA Application Processor Supply |
|
Use Scenario: Generating 1.1V CPU core and 1.8V memory interface voltages in MP3/video player. IC Role / Device Role / Timing Role: High-efficiency dual buck supplying dynamically scaled SoC domains with minimal thermal rise. Use Value: 40μA quiescent current extends playback time in audio-only mode; Burst Mode® maintains regulation during idle periods. |
Use Scenario: Powering ARM-based application processor and peripheral I/O in enterprise PDA. IC Role / Device Role / Timing Role: Dual-channel regulator with independent RUN controls enabling flexible power sequencing and domain isolation. Use Value: POR output coordinates system boot with host processor; ±8.5% reset window ensures reliable firmware initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62400DRCT | 2.25MHz dual buck, but uses external compensation; 0.45Ω/0.55Ω RDS(ON); no integrated POR. | Lacks power-on reset output; requires additional supervisor IC for system boot coordination. | Choose when design flexibility via external compensation outweighs need for integrated POR and lower RDS(ON). |
| MAX17504ATP+T | 3.5MHz dual buck, higher efficiency at >1A, but larger 16-pin TQFN package; no Burst Mode®. | Optimized for higher-current industrial apps; lacks low-IQ mode for battery longevity. | Prefer when 3.5MHz enables smaller passives and >1A per channel is required - not suitable for sub-40μA standby. |
Compared with TPS62400DRCT and MAX17504ATP+T, the LTC3407EDD-4#TRPBF uniquely combines dual 800mA channels, 40μA quiescent current, integrated POR, and 2.25MHz operation in a 3mm×3mm DFN - making it optimal for space- and battery-life-constrained portable designs where system-level reset coordination is critical.
Availability
LTC3407EDD-4#TRPBF is available at Aetrix Electronics and suitable for portable media players, digital cameras, and cellular handsets requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3407EDD-4#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 and maintains its legacy of high-performance analog and power management ICs targeting precision, efficiency, and reliability in demanding applications.
The LTC3407EDD-4#TRPBF belongs to Linear's µPower synchronous buck regulator family, designed specifically for battery-powered portable electronics where small size, low quiescent current, and dual-rail flexibility are essential.
FAQ
What is the maximum output current per channel for the LTC3407EDD-4#TRPBF?
The LTC3407EDD-4#TRPBF delivers up to 800mA continuously per channel under typical conditions (VIN = 3.6V, TA = 25°C). Peak switch current limit is 1.2A (min), allowing short-duration transients above 800mA. Derating applies at elevated ambient temperatures or with poor PCB thermal design - full 800mA per channel is guaranteed over –40°C to 85°C with proper layout and thermal pad soldering.
Does the LTC3407EDD-4#TRPBF support output voltage adjustment below 1.0V?
Yes, the LTC3407EDD-4#TRPBF supports output voltages from 0.6V to 5.0V via external resistor dividers on VFB1 and VFB2. Its 0.6V feedback reference enables precise generation of sub-1V rails such as 0.9V or 0.85V for modern low-voltage processors - provided the resistors are selected to maintain ≥100kΩ total divider impedance and minimize leakage-induced error.
How does Burst Mode® operation affect output voltage ripple on the LTC3407EDD-4#TRPBF?
In Burst Mode®, the LTC3407EDD-4#TRPBF reduces switching activity at light loads, causing periodic energy bursts that increase peak-to-peak output voltage ripple (typically 20–50mV) compared to pulse-skipping mode (<10mV). This trade-off delivers >85% efficiency at 1mA load versus ~70% in pulse-skipping - making Burst Mode® ideal for battery runtime, not noise-sensitive analog sections.
Can the LTC3407EDD-4#TRPBF operate with only ceramic capacitors on input and output?
Yes, the LTC3407EDD-4#TRPBF is qualified for all-ceramic capacitor designs, but requires careful layout: use X5R/X7R dielectrics, place 10μF input and ≥10μF output ceramics close to VIN/GND and SW pins, and add 0.1–1μF high-frequency bypass caps. Avoid long input traces from wall adapters to prevent ringing - ceramic ESR is too low to dampen LC resonance without proper damping or ferrite beads.
What is the function of the exposed pad (Pin 11) on the LTC3407EDD-4#TRPBF DFN package?
The exposed pad (Pin 11) on the LTC3407EDD-4#TRPBF is PGND - power ground - and must be soldered to a large PCB copper pour connected to system ground. It serves dual roles: lowering thermal resistance (θJA = 45°C/W) to sustain 800mA/channel operation, and providing low-inductance return path for high-frequency switch currents to minimize EMI and improve stability.
LTC3407EDD-4#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-4#TRPBF FAQ
1.How can I place an order for LTC3407EDD-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3407EDD-4#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-4#TRPBF reliable?
The price and inventory of LTC3407EDD-4#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-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3407EDD-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3407EDD-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3407EDD-4#TRPBF?
LTC3407EDD-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3407EDD-4#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-4#TRPBF?
For technical support, including LTC3407EDD-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3407EDD-4#TRPBF requirements.
6.How does Aetrix verify that LTC3407EDD-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3407EDD-4#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-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3407EDD-4#TRPBF?
All LTC3407EDD-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3407EDD-4#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-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC3407EDD-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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