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Analog Devices Inc. LTC3447EDD#TRPBF
- Part No.:
- LTC3447EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3447EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,023
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Product details
Overview
LTC3447EDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter with I²C-programmable output voltage (0.69V–2.05V in 21.6mV steps), 600mA output current at 3V input, 1MHz fixed switching frequency, and integrated P/N-channel MOSFETs. It operates from 2.5V to 5.5V input and delivers high efficiency (up to 93%) in portable Li-ion battery-powered systems.
For engineers reviewing the LTC3447EDD#TRPBF datasheet, LTC3447EDD#TRPBF pinout, LTC3447EDD#TRPBF application, or LTC3447EDD#TRPBF equivalent, key selection considerations include I²C voltage programming resolution, Burst Mode quiescent current (33µA), ±2% output accuracy, thermal shutdown protection, and compatibility with ceramic output capacitors in space-constrained 3mm × 3mm DFN packages.
Technical Context
The LTC3447EDD#TRPBF implements current-mode control with internal slope compensation active above 40% duty cycle, enabling stable operation without external compensation. Its dual-MOSFET synchronous architecture eliminates external Schottky diode requirements and supports 100% duty-cycle low-dropout operation down to VIN ≈ VOUT.
Burst Mode operation dynamically disables switching at light loads to maintain 33µA quiescent current, while pulse-skipping mode engages when Burst Mode is disabled. The I²C interface supports standard (100kHz) and fast-mode (400kHz) protocols, with write-only register access controlling DAC output, PGOOD blanking, and Burst Mode enable/disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (fully charged to depleted) without external LDO pre-regulation. |
| Output Voltage Range | 0.69V to 2.05V in 21.6mV steps - enables precise core voltage scaling for low-power microcontrollers and FPGAs. |
| Max Output Current | 600mA at VIN = 3V - sufficient for powering DSPs, RF transceivers, or multi-rail PMIC subsystems. |
| Switching Frequency | 1MHz (±30%) - allows use of compact 2.2–4.7µH inductors and reduces EMI filtering burden. |
| Quiescent Current | 33µA in Burst Mode - extends battery runtime in always-on sensor nodes and standby modes. |
| Output Accuracy | ±2% over temperature - ensures reliable logic-level compliance for 1.2V, 1.8V, and 2.0V I/O domains. |
| I²C Interface | Standard (100kHz) or Fast Mode (400kHz) - compatible with most microcontroller I²C peripherals without clock stretching. |
Pinout & Package
Package: 10-lead 3mm × 3mm DFN with exposed thermal pad (Pin 11), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output voltage sensing node | Internal resistor divider provides feedback reference; connects directly to output capacitor for stability. |
| GND (Pin 2) | Analog/digital ground reference | Common return for control circuitry; must be connected to PCB ground plane under exposed pad. |
| FB (Pin 3) | External feedback input | Used only when optional startup resistors are installed; tied to VIN if unused. |
| PGOOD (Pin 4) | Open-drain power-good indicator | Sinks current when VOUT deviates >10%; blanking enabled via I²C during DAC transitions. |
| VIN (Pin 5) | Main power input | Requires ≥2.2µF ceramic decoupling close to pin; supplies internal regulators and gate drivers. |
| SW (Pin 6) | Switch node connection | Connects to inductor; carries high di/dt pulses; requires tight layout to minimize EMI and ringing. |
| RUN (Pin 7) | Enable/disable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces <1µA shutdown current. |
| SCL (Pin 8) | I²C clock input | Accepts standard/fast-mode clocks; internal hysteresis (300mV) rejects noise on shared bus lines. |
| VCCD (Pin 9) | I²C interface power rail | Must be supplied from same domain as host MCU I²C pins (typically 1.8V–3.3V). |
| SDA (Pin 10) | I²C data input | Write-only interface; acknowledges writes with pull-down during ACK clock pulse. |
Key Features
| Feature | Design Value |
|---|---|
| I²C-programmable 6-bit DAC | Enables dynamic voltage scaling across 64 discrete output levels (0.69V–2.05V) without hardware changes. |
| 100% duty-cycle operation | Maintains regulation down to VIN – VOUT ≤ RDS(ON) × ILOAD, extending usable battery range in portable devices. |
| Stable with ceramic capacitors | Eliminates need for electrolytic or tantalum output caps-reducing board area, cost, and failure risk. |
| Overtemperature protection | Thermal shutdown activates above 125°C junction temperature, preventing damage during sustained overload. |
| Soft-start and slew rate control | Controls DAC transition speed (~11mV/µs) to prevent output overshoot and reduce inrush current stress. |
Applications
| Mobile Processors | Wireless Sensor Nodes |
|---|---|
Use Scenario: Powering ARM Cortex-M4/M7 cores with dynamic voltage/frequency scaling (DVFS) in handheld medical monitors. IC Role / Device Role / Timing Role: Primary buck regulator delivering programmable core voltage (0.9V–1.3V) synchronized to processor sleep/wake states via I²C. Use Value: Enables real-time voltage adjustment matching computational load, reducing average power by up to 35% versus fixed-output regulators. | Use Scenario: Supplying ultra-low-power sub-GHz RF transceivers (e.g., Silicon Labs Si446x) in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Main supply rail generator with Burst Mode active during 99% sleep time, waking only for brief transmission bursts. Use Value: Achieves 33µA quiescent current during sleep, enabling >10-year battery life on CR2032 cells. |
| Industrial HMI Panels | Portable Test Equipment |
Use Scenario: Generating clean 1.8V and 3.3V rails for touch controller ICs and display drivers in factory-floor HMIs. IC Role / Device Role / Timing Role: Dual-rail source using external feedback resistors for startup, then I²C reconfiguration for different display modes. Use Value: Eliminates need for multiple fixed-output regulators or manual jumper settings-reducing BOM count and field service complexity. | Use Scenario: Powering mixed-signal ASICs in handheld oscilloscopes and multimeters requiring precise analog supply rails. IC Role / Device Role / Timing Role: Low-noise, high-accuracy buck stage feeding ADC reference buffers and op-amp signal chains. Use Value: ±2% output accuracy and ceramic-capacitor stability ensure <0.1% measurement drift across temperature and load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C-programmable buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | Fixed 1.8V/2.5V/3.3V outputs; no I²C interface; 3MHz switching; 300mA max. | Not suitable for dynamic voltage scaling; limited to static rail generation in space-constrained designs. | Select only when programmability is unnecessary and higher frequency/lower inductance is prioritized. |
| ISL80101IRAJZ | PIN-to-PIN compatible 3mm × 3mm DFN; 600mA; 1MHz; but no I²C-uses external resistor divider for fixed output. | Requires PCB redesign to add feedback resistors; lacks runtime voltage adjustment capability. | Choose when system firmware cannot support I²C control but identical footprint and thermal performance are required. |
Compared with TPS62260DRVR and ISL80101IRAJZ, the LTC3447EDD#TRPBF uniquely combines I²C-based voltage programmability, 600mA capability, and Burst Mode efficiency in a 3mm × 3mm package-making it the only option for applications demanding both dynamic scaling and ultra-low quiescent current.
Availability
LTC3447EDD#TRPBF is available at Aetrix Electronics and suitable for portable medical devices, wireless sensor networks, industrial HMIs, and handheld test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3447EDD#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 power management ICs with rigorous automotive and industrial qualification.
The LTC3447EDD#TRPBF belongs to Linear's precision monolithic buck regulator product line, designed specifically for battery-powered systems requiring programmable output voltage, minimal quiescent current, and robust thermal management.
FAQ
What is the minimum input voltage required for the LTC3447EDD#TRPBF to regulate at 2.05V output?
The LTC3447EDD#TRPBF requires a minimum input voltage of 2.5V per its absolute ratings and electrical characteristics. At 2.05V output, regulation is maintained down to VIN ≈ 2.15V (accounting for P-channel RDS(ON) drop at load), but full specification compliance-including ±2% accuracy and 600mA capability-is guaranteed only from VIN = 2.5V onward. Below 2.5V, the part may operate but is outside datasheet guarantees.
Does the LTC3447EDD#TRPBF require external compensation components?
No, the LTC3447EDD#TRPBF uses internal current-mode control with built-in slope compensation and does not require external compensation components. Stability is ensured with ceramic output capacitors (≥4.7µF) and proper PCB layout-eliminating the need for type-II or type-III compensation networks typically required in voltage-mode controllers.
How does the I²C interface of the LTC3447EDD#TRPBF handle DAC updates during active regulation?
The LTC3447EDD#TRPBF applies DAC updates only after receiving a valid STOP command, ensuring atomic voltage transitions. During update, PGOOD can be blanked via I²C register bit to prevent false fault reporting. The DAC slew rate (~11mV/µs) limits transition speed, avoiding output overshoot and minimizing transient load current demand.
Can the LTC3447EDD#TRPBF operate without external feedback resistors?
Yes, the LTC3447EDD#TRPBF defaults to internal feedback and starts up at 1.38V when FB is tied to VIN. External resistors are optional and used only to set a custom startup voltage before I²C initialization. If omitted, the device relies entirely on the internal 6-bit DAC for output control-no external components are needed for basic operation.
What thermal derating applies to the LTC3447EDD#TRPBF at 600mA continuous load?
With θJA = 43°C/W and maximum junction temperature of 125°C, the LTC3447EDD#TRPBF dissipates ~360mW at 600mA (based on typical RDS(ON) and efficiency). At 25°C ambient, this yields ~115°C junction temperature-within spec. For continuous 600mA operation, ensure ≥1in² copper pour under the exposed pad and limit ambient to ≤40°C for safety margin.
LTC3447EDD#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:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.69V
- Voltage - Output (Max):
- 2.05V
- Current - Output:
- 600mA
- Frequency - Switching:
- 160kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3447EDD#TRPBF FAQ
1.How can I place an order for LTC3447EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3447EDD#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 LTC3447EDD#TRPBF reliable?
The price and inventory of LTC3447EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3447EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3447EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3447EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3447EDD#TRPBF?
LTC3447EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3447EDD#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 LTC3447EDD#TRPBF?
For technical support, including LTC3447EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3447EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3447EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3447EDD#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 LTC3447EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3447EDD#TRPBF?
All LTC3447EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3447EDD#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 LTC3447EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3447EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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