My Inquiry
My Account
Analog Devices Inc. LTC3447EDD#PBF
- Part No.:
- LTC3447EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3447EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3447EDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous current-mode buck regulator with I²C-programmable output voltage (0.69V–2.05V in 21.6mV steps), 600mA output capability at 3V input, and 1MHz fixed switching frequency. It integrates P- and N-channel MOSFETs, operates from 2.5V to 5.5V input, and delivers ±2% output accuracy for Li-ion-powered portable systems.
For engineers reviewing the LTC3447EDD#PBF datasheet, LTC3447EDD#PBF pinout, LTC3447EDD#PBF application, or LTC3447EDD#PBF equivalent, key selection considerations include I²C-controlled DAC resolution, Burst Mode quiescent current (33µA), 100% duty-cycle low-dropout operation, thermal shutdown protection, and compatibility with ceramic output capacitors in space-constrained DFN layouts.
Technical Context
The LTC3447EDD#PBF implements a current-mode control architecture with internal slope compensation active above 40% duty cycle, enabling stable operation without external compensation. Its dual-MOSFET synchronous rectification eliminates external Schottky diodes and supports discontinuous conduction mode during light-load pulse skipping.
I²C interface supports standard (100kHz) and fast mode (400kHz) operation, with write-only register access controlling DAC bits, burst mode enable/disable, and PGOOD blanking. The device transitions from external resistor-based startup (0.6V reference) to internal DAC regulation upon receipt of a valid STOP command.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion battery operation across full discharge curve. |
| Output Voltage Range | 0.69V to 2.05V in 21.6mV steps - 6-bit DAC enables precise core voltage scaling for processors and FPGAs. |
| Max Output Current | 600mA at VIN = 3V - sufficient for powering low-power microcontrollers and memory subsystems. |
| Switching Frequency | 1MHz (±30%) - allows use of compact 3.3µH inductors and ceramic capacitors in portable designs. |
| Quiescent Current | 33µA in Burst Mode - extends battery runtime in standby and ultra-light-load conditions. |
| Shutdown Current | <1µA - enables true system-level power gating with negligible leakage. |
| Output Accuracy | ±2% over temperature - ensures reliable voltage margining for sensitive analog and digital loads. |
| Duty Cycle Range | 0% to 100% - maintains regulation down to VIN ≈ VOUT + RDS(ON) × ILOAD, critical for end-of-battery-life operation. |
Pinout & Package
10-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output voltage sense node | Internal resistive divider provides feedback reference; connects directly to output capacitor. |
| GND (Pin 2) | Analog and power ground reference | Reference for error amplifier and logic circuits; separate from NFET source return path. |
| FB (Pin 3) | External feedback input | Accepts optional resistor divider for startup voltage setting; must tie to VIN if unused. |
| PGOOD (Pin 4) | Open-drain fault indicator | Sinks current when VOUT deviates >10% from setpoint; blanking enabled via I²C register. |
| VIN (Pin 5) | Main power input | Supplies internal circuitry and power switches; requires ≥2.2µF local ceramic decoupling. |
| SW (Pin 6) | Switch node connection | Drain terminals of internal P- and N-channel MOSFETs; connects to inductor and catch capacitor. |
| RUN (Pin 7) | Enable/disable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces shutdown with <1µA draw. |
| SCL (Pin 8) | I²C clock input | Accepts 100kHz or 400kHz clock signals; hysteresis of 300mV improves noise immunity. |
| VCCD (Pin 9) | I²C interface power rail | Independent 1.8V–5.5V supply for SDA/SCL logic; decoupled separately from main VIN. |
| SDA (Pin 10) | I²C data input | Write-only serial interface; acknowledges writes with pull-down during ACK clock pulse. |
Key Features
| Feature | Design Value |
|---|---|
| I²C programmable output | 21.6mV DAC step size enables fine-grained voltage scaling for dynamic power management. |
| Burst Mode operation | Reduces quiescent current to 33µA while maintaining regulation-critical for battery longevity. |
| No external Schottky required | Integrated synchronous rectification increases efficiency by eliminating forward voltage drop loss. |
| Ceramic capacitor stability | Compensated for zero-ESR output caps-enables smaller, lower-cost, higher-reliability filtering. |
| 100% duty cycle capability | Extends usable battery range by regulating down to VIN ≈ VOUT + (RDS(ON) × ILOAD). |
| Soft-start and slew rate control | ~11mV/µs output ramp prevents inrush current and reduces EMI during power-up transitions. |
Applications
| Mobile Processor Core Supply | USB-Powered Peripheral Regulation |
|---|---|
Use Scenario: Powering ARM Cortex-M or RISC-V SoC cores in handheld devices requiring dynamic voltage scaling between 0.8V and 1.2V. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, I²C-adjustable VDD_CORE with fast transient response. Use Value: Enables real-time DVFS based on workload, reducing average power consumption by up to 35% versus fixed-output regulators. | Use Scenario: Regulating clean 1.8V or 3.3V rails for USB-C peripherals (e.g., dongles, adapters) powered from 5V bus. IC Role / Device Role / Timing Role: Efficient step-down converter with low-noise output and fast load-step recovery for signal-integrity-sensitive interfaces. Use Value: Eliminates need for LDO post-regulation, improving overall efficiency from 5V to 1.8V by >22% at 300mA load. |
| Li-ion Battery Backup System | Industrial Sensor Node Power |
Use Scenario: Maintaining stable 1.2V supply for RTC and SRAM during main power failure in battery-backed systems. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator operating in Burst Mode to extend backup runtime. Use Value: Achieves 12+ hours of retention on a single CR2032 cell due to 33µA operating current and <1µA shutdown draw. | Use Scenario: Powering ultra-low-power environmental sensors (e.g., temperature/humidity ICs) in wireless IoT nodes. IC Role / Device Role / Timing Role: Primary power converter supporting intermittent 10ms active bursts followed by multi-second sleep cycles. Use Value: Delivers 93% peak efficiency at 100mA and sustains 87% efficiency at 1mA-maximizing energy per battery charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | Fixed-output variants only; no I²C interface; 2.05V–6.0V input; 3MHz switching. | Lacks programmability-requires redesign for voltage scaling or multiple BOMs. | Select when fixed output simplifies layout and higher frequency enables smaller passives. |
| MAX8640YETA+ | I²C-compatible but 8-bit DAC (12.5mV steps); 2.6V–5.5V input; 1.2A max output. | Higher current capability but larger 16-pin TQFN package and no PGOOD blanking. | Select when higher load current is needed and board area permits larger footprint. |
Compared with TPS62260DRVR and MAX8640YETA+, the LTC3447EDD#PBF uniquely combines I²C-programmable 6-bit DAC, 3mm×3mm DFN packaging, and sub-1µA shutdown-making it optimal for space-constrained, battery-sensitive designs requiring dynamic voltage control without external components.
Availability
LTC3447EDD#PBF is available at Aetrix Electronics and suitable for mobile computing, USB-C peripheral design, battery backup systems, and industrial sensor nodes requiring stable component supply with long-term manufacturability.
Supply support for LTC3447EDD#PBF 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 high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3447EDD#PBF belongs to Linear's precision monolithic buck regulator family, designed specifically for portable and battery-operated applications demanding programmable output, ultra-low quiescent current, and minimal external component count.
FAQ
What is the minimum input voltage required for the LTC3447EDD#PBF to regulate at 2.05V output?
The LTC3447EDD#PBF requires a minimum input voltage of approximately 2.15V to regulate at 2.05V output, accounting for worst-case RDS(ON) of the P-channel MOSFET (0.32Ω) and 600mA load current. At lighter loads, regulation is possible closer to VOUT due to reduced dropout voltage. Full specification is validated across 2.5V–5.5V input range per datasheet Absolute Maximum Ratings.
Does the LTC3447EDD#PBF support read-back of the current DAC setting via I²C?
No, the LTC3447EDD#PBF implements a write-only I²C interface. It does not support register read-back functionality. The DAC value is set via seven-bit address (1100110) followed by one data byte containing six DAC bits and two control bits; status must be inferred from PGOOD assertion or external measurement.
Can the LTC3447EDD#PBF operate without external feedback resistors?
Yes, the LTC3447EDD#PBF operates without external feedback resistors. In that configuration, the FB pin must be tied directly to VIN, and the device defaults to 1.38V startup output (DAC code 100000). Regulation then transitions to the programmed DAC voltage after a valid I²C STOP command is received.
What thermal derating applies to the LTC3447EDD#PBF at 600mA continuous load?
At 600mA continuous load with 3.6V input and 1.2V output, the LTC3447EDD#PBF dissipates ~180mW. With θJA = 43°C/W, junction temperature rise is ~7.7°C above ambient. Derating is not required below 125°C junction limit; however, PCB copper area under the exposed pad must be ≥100mm² for specified thermal performance.
Is the PGOOD signal of the LTC3447EDD#PBF actively driven high or open-drain?
The PGOOD signal of the LTC3447EDD#PBF is an open-drain output. It sinks current when VOUT falls outside ±10% regulation window and remains high-impedance otherwise. An external pull-up resistor (typically 10kΩ to VOUT or system rail) is required for proper logic-level signaling.
LTC3447EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3447EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3447EDD#PBF 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#PBF reliable?
The price and inventory of LTC3447EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3447EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3447EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3447EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3447EDD#PBF?
LTC3447EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3447EDD#PBF 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#PBF?
For technical support, including LTC3447EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3447EDD#PBF requirements.
6.How does Aetrix verify that LTC3447EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3447EDD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3447EDD#PBF?
All LTC3447EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3447EDD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3447EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3447EDD#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
