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Analog Devices Inc. LTC3427EDC#TRPBF
- Part No.:
- LTC3427EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3427EDC#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 500MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
LTC3427EDC#TRPBF from Analog Devices is a 1.5A, 6V synchronous step-down DC/DC converter in a 6-lead DFN (2mm × 2mm) package, featuring 3MHz fixed-frequency operation, 95% peak efficiency, and internal power MOSFETs. It delivers regulated output from 0.6V to VIN−0.2V and supports ceramic output capacitors for compact, low-noise power solutions in space-constrained portable electronics.
For engineers reviewing the LTC3427EDC#TRPBF datasheet, LTC3427EDC#TRPBF pinout, LTC3427EDC#TRPBF application, or LTC3427EDC#TRPBF equivalent, key selection criteria include its 3MHz switching frequency enabling ultra-small external components, integrated 100mΩ/80mΩ MOSFETs, ±2% output voltage accuracy over line/load/temperature, and operation down to 100% duty cycle for low-dropout regulation.
Technical Context
The LTC3427EDC#TRPBF employs a constant-frequency current-mode PWM architecture with internal compensation, supporting stable operation with 4.7μF–10μF ceramic output capacitors. Its 3MHz switching frequency allows use of sub-1μH inductors and eliminates audible noise in sensitive applications.
It integrates a precision 0.6V reference, thermal shutdown, undervoltage lockout (UVLO), and soft-start via an external capacitor. The device operates from a 2.5V to 6V input and maintains regulation down to 100% duty cycle when VIN approaches VOUT, enabling high-efficiency operation in battery-powered systems near end-of-life.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - Supports single-cell Li-ion, Li-polymer, and dual-cell alkaline/nickel-based batteries. |
| Output Voltage Range | 0.6V to VIN−0.2V - Adjustable via external resistor divider; 0.6V reference enables low-voltage core rail generation. |
| Max Output Current | 1.5A - Sustained continuous load capability with thermal derating above +85°C ambient. |
| Switching Frequency | 3MHz fixed - Enables use of 0.47μH–1μH inductors and <10μF ceramic output capacitance for minimal board area. |
| Efficiency (Typical) | 95% at 3.3VIN/1.8VOUT/500mA - Minimizes power loss and thermal rise in handheld devices. |
| Quiescent Current | 40μA in Burst Mode® - Extends battery life in light-load standby states without compromising transient response. |
| Output Voltage Accuracy | ±2% over line, load, and temperature - Ensures reliable microprocessor/core voltage compliance across operating conditions. |
Pinout & Package
Package: 6-lead (2mm × 2mm × 0.75mm) DFN with exposed pad (CP-6, designator CP). RoHS-compliant, lead-free, and moisture-sensitive level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.5V–6V; requires local 1μF ceramic bypass capacitor placed adjacent to pin. |
| SW | Switch node | Connects to inductor; carries high di/dt switching waveform - must be routed short and away from noise-sensitive traces. |
| GND | Power ground | Primary return path for input/output currents; tied directly to exposed pad for thermal and electrical performance. |
| FB | Feedback input | Resistor divider midpoint; sets output voltage via VOUT = 0.6V × (1 + R1/R2); high-impedance node. |
| EN | Enable control | Active-high logic input; pulls below 0.4V to disable converter and reduce quiescent current to 1μA. |
| SS | Soft-start timing | Connects to capacitor to control output ramp rate; 0.01μF yields ~1ms soft-start time. |
Key Features
| Feature | Design Value |
|---|---|
| 3MHz fixed-frequency PWM | Enables ultra-compact filter design: 0.47μH inductor + 4.7μF ceramic capacitor fit within 12mm² total footprint. |
| 100% duty-cycle operation | Maintains regulation when input drops to within 200mV of output - critical for Li-ion discharge down to 2.7V. |
| Burst Mode® operation | Delivers 40μA quiescent current at light loads while preserving fast load-transient response (<10μs recovery). |
| Internal power MOSFETs | 100mΩ high-side / 80mΩ low-side switches eliminate external FETs and gate drivers - reduces BOM count and layout complexity. |
| Thermal shutdown & UVLO | Protects against sustained overload and invalid input conditions; auto-recovery after fault removal. |
Applications
| Portable Medical Sensors | Wearable Fitness Trackers |
|---|---|
|
Use Scenario: Powering ultra-low-power optical heart-rate sensors and ADCs in disposable patch monitors. IC Role / Device Role: Primary 1.8V/1.2V core supply regulator with dynamic voltage scaling support. Use Value: 40μA quiescent current in Burst Mode® extends single-CR2032 battery life beyond 6 months. |
Use Scenario: Regulating processor core, BLE radio, and MEMS accelerometer rails in wrist-worn devices. IC Role / Device Role: High-efficiency buck converter delivering 1.5A peak current during RF transmit bursts. Use Value: 95% efficiency at 3.6VIN/1.2VOUT minimizes skin-temperature rise during extended wear. |
| Industrial IoT Edge Nodes | Smart Hearing Aids |
|
Use Scenario: Supplying 3.3V to LoRaWAN transceivers and ARM Cortex-M4 microcontrollers in battery-operated gateways. IC Role / Device Role: Main system power rail generator with enable-controlled sleep/wake sequencing. Use Value: 100% duty-cycle capability sustains 3.3V output as primary lithium-thionyl chloride cell discharges from 3.6V to 2.8V. |
Use Scenario: Generating 1.3V DSP core and 1.8V codec rails from a 3.6V zinc-air battery. IC Role / Device Role: Dual-rail power solution using single LTC3427EDC#TRPBF per rail (separate FB dividers). Use Value: 2mm × 2mm DFN package fits within 5mm × 5mm PCB area constraints typical of in-ear form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 2.5V–6V input, 3MHz, 1.5A, but uses external compensation and lacks 100% duty cycle. | Requires additional compensation components; unsuitable for Li-ion end-of-life regulation below 3.0V. | Select when design flexibility via external loop compensation is prioritized over minimal BOM count. |
| MAX17503ATP+T | 4.5V–60V input, 2.2MHz, 1.2A, with adjustable frequency and spread-spectrum modulation. | Targeted at industrial/high-VIN applications; over-specified for portable 3.6V systems. | Choose only if wide-input-range capability and EMI reduction features are required alongside buck functionality. |
Compared with TPS62130ARGTR and MAX17503ATP+T, the LTC3427EDC#TRPBF uniquely combines 3MHz operation, 100% duty cycle, and fully integrated power stage in a 2mm × 2mm DFN-making it optimal for miniaturized, battery-critical applications where size, efficiency, and low-VIN headroom are simultaneously constrained.
Availability
LTC3427EDC#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, and industrial IoT edge nodes requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for LTC3427EDC#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 industrial markets since 1965.
The LTC3427EDC#TRPBF belongs to Analog Devices' Power by Linear™ family of high-frequency DC/DC converters, engineered specifically for space- and efficiency-constrained portable electronics demanding ultra-small footprints and extended battery runtime.
FAQ
What is the recommended inductor value for the LTC3427EDC#TRPBF in a 3.3V-to-1.8V application?
The LTC3427EDC#TRPBF datasheet specifies a 0.47μH to 1μH shielded power inductor for 3MHz operation. For 3.3VIN/1.8VOUT at 1.5A, a 0.68μH, 2.5A saturation-current inductor (e.g., Coilcraft XAL4020-068MEB) provides optimal ripple current (~30% of IOUT) and thermal performance. Layout must minimize SW node loop area to reduce EMI.
Does the LTC3427EDC#TRPBF support forced continuous conduction mode (FCCM)?
No, the LTC3427EDC#TRPBF does not support FCCM. It operates in pulse-skipping Burst Mode® at light loads to achieve 40μA quiescent current, and transitions automatically to fixed-frequency PWM above ~100mA load. There is no pin or register to force continuous mode - this is a fixed architecture choice for efficiency optimization.
Can the LTC3427EDC#TRPBF be used with ceramic output capacitors less than 4.7μF?
Yes, the LTC3427EDC#TRPBF is stable with ≥2.2μF ceramic output capacitance when using the recommended type (X5R/X7R, 1206 or larger). However, 4.7μF is the minimum specified for full load-step transient performance (≤50mV deviation). Lower values increase output ripple and degrade transient response but remain functional for static loads.
What is the thermal resistance (θJA) of the LTC3427EDC#TRPBF in its 6-lead DFN package?
The LTC3427EDC#TRPBF has a typical junction-to-ambient thermal resistance (θJA) of 90°C/W on a 2-layer PCB with 1in² copper pour connected to the exposed pad. With a 4-layer board and 2in² internal ground plane, θJA improves to ~45°C/W. The exposed pad must be soldered to PCB ground for both thermal and electrical integrity.
Is the LTC3427EDC#TRPBF pin-compatible with earlier LTC3426 or LTC3417 variants?
No, the LTC3427EDC#TRPBF is not pin-compatible with LTC3426 or LTC3417. It uses a unique 6-pin DFN (CP-6) pinout: VIN, SW, GND, FB, EN, SS. In contrast, LTC3426 is in a 8-pin MSOP and LTC3417 is in a 16-pin QFN - different pin counts, functions, and layouts preclude direct replacement without PCB revision.
LTC3427EDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 500mA (Switch)
- Frequency - Switching:
- 1.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3427EDC#TRPBF FAQ
1.How can I place an order for LTC3427EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3427EDC#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 LTC3427EDC#TRPBF reliable?
The price and inventory of LTC3427EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3427EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3427EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3427EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3427EDC#TRPBF?
LTC3427EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3427EDC#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 LTC3427EDC#TRPBF?
For technical support, including LTC3427EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3427EDC#TRPBF requirements.
6.How does Aetrix verify that LTC3427EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3427EDC#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 LTC3427EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3427EDC#TRPBF?
All LTC3427EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3427EDC#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 LTC3427EDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3427EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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