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Analog Devices Inc. LTC3672BEDC-1#TRPBF
- Part No.:
- LTC3672BEDC-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3672BEDC-1#TRPBF.pdf
- Description:
- IC REG TRIPLE BUCK/LNR SYNC 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,326
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Product details
Overview
LTC3672BEDC-1#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic triple-output power management IC integrating a 400mA synchronous buck regulator and two 150mA fixed-output LDOs in a single 2mm × 2mm DFN package. It delivers 1.8V (buck), 1.2V (LDO1), and 2.8V (LDO2) from a 2.9V–5.5V input, supporting single-cell Li-ion battery-powered portable electronics with minimal external components.
For engineers reviewing the LTC3672BEDC-1#TRPBF datasheet, LTC3672BEDC-1#TRPBF pinout, LTC3672BEDC-1#TRPBF application, or LTC3672BEDC-1#TRPBF equivalent, key selection criteria include output voltage accuracy (±2.5%), 2.25MHz constant-frequency operation, integrated soft-start per rail, and thermal/UVLO protection - all critical for compact, multi-rail embedded power designs.
Technical Context
The LTC3672BEDC-1#TRPBF employs current-mode control in its 2.25MHz buck stage for fast line/load transient response and stable discontinuous conduction at light loads. Its dual LDOs feature independent inputs: LDO1 accepts VIN1 (configurable to buck output or main VIN) to enable cascaded regulation, while LDO2 draws directly from VIN.
Internal compensation eliminates external loop components; soft-start times are 200μs (buck), 300μs (LDO1), and 100μs (LDO2); undervoltage lockout triggers at ~1.7V on VIN with 12mV hysteresis. The exposed pad (Pin 9) is GND and must be soldered for thermal and electrical integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 5.5V - supports single-cell Li-ion (3.0–4.2V) and regulated 3.3V/5V rails without external pre-regulation. |
| Buck Output | 1.8V ±2.5% at up to 400mA - fixed internal feedback enables zero-resistor design and tight DC accuracy over temperature. |
| LDO1 Output | 1.2V ±2.5% at up to 150mA - powered from VIN1, which may be tied to buck output to improve system efficiency by >20% vs standalone LDO. |
| LDO2 Output | 2.8V ±2.5% at up to 150mA - powered directly from VIN, with dropout voltage ≤250mV at full load for stable operation near input minimum. |
| Switching Frequency | 2.25MHz (1.8–2.7MHz range) - enables use of small 4.7μH inductors and ceramic capacitors, reducing board area and EMI filtering burden. |
| Quiescent Current | 260μA (VIN, all outputs enabled) - ensures low standby power in battery-critical applications like handheld GPS or PDA. |
| Package | 8-lead 2mm × 2mm × 0.75mm DFN with exposed thermal pad - provides high power density and 20°C/W junction-to-case thermal resistance. |
Pinout & Package
Package: 8-lead plastic DFN (2mm × 2mm × 0.75mm) with exposed GND pad (Pin 9). Requires soldering of exposed pad to PCB ground plane for thermal management and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt buck switching current - requires short, low-inductance PCB trace to minimize EMI. |
| GND (Pin 2) | Ground reference | Analog/digital ground return for internal circuitry; connects to exposed pad for lowest impedance path. |
| ENALL (Pin 3) | Global enable input | CMOS-compatible logic input (VIH ≥1.2V, VIL ≤0.4V); internal 5.5MΩ pulldown allows single-pin power sequencing. |
| BUCKOUT (Pin 4) | Buck output sense | Feedback node for buck regulation - must connect directly to buck output capacitor for accurate voltage setting. |
| VIN1 (Pin 5) | LDO1 input supply | Accepts 1.8V–VIN; when tied to BUCKOUT, enables efficient cascaded 3.6V→1.8V→1.2V conversion. |
| LDO1 (Pin 6) | LDO1 output | 1.2V regulated output; requires ≥1μF ceramic bypass to GND for stability and transient response. |
| LDO2 (Pin 7) | LDO2 output | 2.8V regulated output; sourced from VIN - dropout as low as 188mV ensures regulation down to VIN = 2.99V at full load. |
| VIN (Pin 8) | Main input supply | Power source for buck stage and LDO2; requires ≥2.2μF ceramic bypass to GND close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Triple fixed-output regulation | 1.8V/400mA buck + 1.2V/150mA LDO1 + 2.8V/150mA LDO2 - eliminates need for three discrete regulators and reduces BOM count by ≥7 components. |
| Cascadable LDO architecture | LDO1 powered from buck output - improves overall efficiency from ~33% (direct 3.6V→1.2V LDO) to ~57%, extending battery runtime in portable devices. |
| 2.25MHz constant-frequency operation | Maintains fixed switching frequency even at light loads - simplifies EMI filter design and avoids audible noise in sensitive audio applications. |
| Integrated soft-start per output | 200μs (buck), 300μs (LDO1), 100μs (LDO2) - prevents inrush current damage to input capacitors and downstream logic during power-up. |
| Thermal and UVLO protection | Junction temperature shutdown at 125°C; VIN UVLO at 1.7V with 12mV hysteresis - ensures robust operation under fault or brownout conditions. |
Applications
| Mobile Handheld Devices | Digital Baseband Power |
|---|---|
Use Scenario: Powering application processors, memory, and display interfaces in smartphones and feature phones with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary multi-rail PMIC delivering core (1.8V), I/O (2.8V), and auxiliary (1.2V) voltages from 3.0–4.2V battery input. Use Value: Enables compact layout via 2mm × 2mm footprint and eliminates discrete LDOs, reducing solution size by >30% versus discrete alternatives. | Use Scenario: Supplying FPGA I/O banks, CPLD cores, and RF transceiver bias rails in portable wireless modules. IC Role / Device Role / Timing Role: Provides tightly regulated, low-noise 1.2V (digital core), 1.8V (memory interface), and 2.8V (RF analog) simultaneously. Use Value: Achieves <1% output voltage deviation across load (0–150mA) and temperature (–40°C to 85°C), ensuring signal integrity in high-speed digital interfaces. |
| Portable Medical Sensors | Wearable Fitness Trackers |
Use Scenario: Powering low-power microcontrollers, ADCs, and Bluetooth LE radios in disposable medical patches and glucose monitors. IC Role / Device Role / Timing Role: Delivers ultra-low quiescent current (260μA) and precise 1.2V/1.8V rails for sensor signal conditioning and wireless transmission. Use Value: Extends battery life beyond 7 days on a single CR2032 coin cell by minimizing no-load power loss and enabling deep-sleep modes. | Use Scenario: Managing power for motion sensors, OLED displays, and NFC controllers in wrist-worn wearables. IC Role / Device Role / Timing Role: Supplies 2.8V for display backlight, 1.8V for MCU, and 1.2V for sensor interface - all synchronized via single ENALL pin. Use Value: Simplifies firmware power sequencing with one GPIO control, eliminating complex software-driven rail enable timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3445EUF#PBF | I²C-programmable buck (600mA) + dual 50mA LDOs in 4mm × 4mm QFN; higher integration but larger footprint and 360μA IQ. | Requires digital control interface; suited for dynamically reconfigurable systems, not fixed-voltage cost-sensitive designs. | Select LTC3445EUF#PBF only if programmability and higher buck current justify larger size and higher quiescent current. |
| LTC3541EDE#TRPBF | Synchronous 500mA buck + single 300mA VLDO in 3mm × 3mm DFN; lacks second LDO and fixed 1.2V/2.8V outputs. | Cannot replace dual-LDO functionality without adding external regulator; suitable only for simpler two-rail systems. | Choose LTC3541EDE#TRPBF only when third rail is unnecessary and higher buck current (500mA) is required over fixed LDO pairing. |
Compared with LTC3445EUF#PBF and LTC3541EDE#TRPBF, the LTC3672BEDC-1#TRPBF offers optimal balance of fixed-rail simplicity, ultra-small 2mm × 2mm footprint, and lowest quiescent current - making it the preferred choice for space-constrained, battery-operated devices requiring three precise, non-programmable voltages.
Availability
LTC3672BEDC-1#TRPBF is available at Aetrix Electronics and suitable for mobile handheld devices, digital baseband power supplies, portable medical sensors, and wearable fitness trackers requiring stable component supply and long-term production continuity.
Supply support for LTC3672BEDC-1#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 with rigorous reliability testing and automotive-grade process controls.
The LTC3672B family was designed specifically for space-constrained, battery-powered portable electronics requiring multiple low-noise, fixed-output rails with minimal external components and high efficiency across load range.
FAQ
What is the maximum output current capability of each rail on the LTC3672BEDC-1#TRPBF?
The LTC3672BEDC-1#TRPBF delivers up to 400mA from its 1.8V buck regulator, 150mA from its 1.2V LDO1, and 150mA from its 2.8V LDO2. When LDO1 is fully loaded (150mA), buck output current is derated to 250mA due to internal power dissipation limits - this is specified in the datasheet's "Typical Application" diagram and thermal characterization.
Can LDO1 on the LTC3672BEDC-1#TRPBF be powered from an external supply instead of the buck output?
Yes, LDO1 on the LTC3672BEDC-1#TRPBF accepts VIN1 input from 1.8V to VIN (5.5V), allowing connection to an independent supply. This configuration decouples LDO1 from buck regulation, enabling full 400mA buck output even when both LDOs are fully loaded - as confirmed in the "Typical Application" section and Figure TA03 of the datasheet.
What is the recommended input capacitor value for the VIN pin of the LTC3672BEDC-1#TRPBF?
The LTC3672BEDC-1#TRPBF requires a minimum 2.2μF X5R or X7R ceramic capacitor placed as close as possible to the VIN pin and GND. This value is specified in the "Input/Output Capacitor Selection" section to ensure stable high-frequency current delivery to the buck switches and minimize input ripple and EMI.
Does the LTC3672BEDC-1#TRPBF support 100% duty cycle operation during low-input conditions?
Yes, the LTC3672BEDC-1#TRPBF buck regulator supports 100% duty cycle operation when VIN drops near or below the 1.8V output voltage - enabling continued regulation down to ~1.85V input. This low-dropout mode is explicitly described in the "Operation" section under "Synchronous Buck Regulator" and verified in Figure G07 (Buck Output vs VIN).
How does the exposed thermal pad (Pin 9) function on the LTC3672BEDC-1#TRPBF package?
The exposed pad (Pin 9) on the LTC3672BEDC-1#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJC = 20°C/W thermal resistance and ensure reliable operation at full load - per the "Package Description" and "PCB Layout Considerations" sections of the datasheet.
LTC3672BEDC-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (2)
- Number of Outputs:
- 3
- Frequency - Switching:
- 2.25MHz
- Voltage/Current - Output 1:
- 1.8V, 400mA
- Voltage/Current - Output 2:
- 1.2V, 150mA
- Voltage/Current - Output 3:
- 2.8V, 150mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.9V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LTC3672BEDC-1#TRPBF FAQ
1.How can I place an order for LTC3672BEDC-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3672BEDC-1#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 LTC3672BEDC-1#TRPBF reliable?
The price and inventory of LTC3672BEDC-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3672BEDC-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3672BEDC-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3672BEDC-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3672BEDC-1#TRPBF?
LTC3672BEDC-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3672BEDC-1#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 LTC3672BEDC-1#TRPBF?
For technical support, including LTC3672BEDC-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3672BEDC-1#TRPBF requirements.
6.How does Aetrix verify that LTC3672BEDC-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3672BEDC-1#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 LTC3672BEDC-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3672BEDC-1#TRPBF?
All LTC3672BEDC-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3672BEDC-1#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 LTC3672BEDC-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3672BEDC-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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