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Analog Devices Inc. LTC3672BEDC-1
- Part No.:
- LTC3672BEDC-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3672BEDC-1.pdf
- Description:
- IC REG TRIPLE BUCK/LNR SYNC 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,076
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Product details
Overview
LTC3672BEDC-1 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 1.2V (buck), 2.8V (LDO1), and 1.8V (LDO2) from a 2.9V–5.5V input, supporting compact portable electronics requiring tightly regulated low-voltage rails for digital logic, I/O, and RF chipsets.
For engineers reviewing the LTC3672BEDC-1 datasheet, LTC3672BEDC-1 pinout, LTC3672BEDC-1 application, or LTC3672BEDC-1 equivalent, this page provides verified technical context, validated pin functions, confirmed output specifications, real-world load transient behavior, and peer-validated alternative options - all specific to the LTC3672BEDC-1 variant.
Technical Context
The LTC3672BEDC-1 employs constant-frequency current-mode control at 2.25MHz for the buck stage, enabling stable operation down to no-load while maintaining excellent line and load transient response. Its internal soft-start (200μs for buck, 100μs per LDO) limits inrush current, and slew-rate-controlled SW node reduces EMI without sacrificing efficiency.
All three outputs share a single ENALL enable pin; shutdown disables the buck and both LDOs simultaneously. The buck uses internal compensation and requires only one external inductor (e.g., 4.7μH) and ceramic capacitors, while each LDO mandates ≥1μF ceramic output capacitance for stability and transient performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 5.5V - compatible with single-cell Li-ion/Li-Po batteries and standard 3.3V/5V system rails. |
| Buck Output | 1.2V ±2.5% - fixed, 400mA capable, with internal compensation and 2.25MHz switching. |
| LDO1 Output | 2.8V ±2.5% - fixed, 150mA capable, powered from VIN1, dropout ≤250mV @150mA. |
| LDO2 Output | 1.8V ±2.5% - fixed, 150mA capable, powered directly from VIN, dropout ≤400mV @150mA. |
| Quiescent Current (All Enabled) | 260μA typical at VIN = 3.6V - enables long battery life in always-on portable systems. |
| Package | 8-lead 2mm × 2mm × 0.75mm DFN with exposed pad - thermally enhanced, footprint-optimized for space-constrained designs. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer handheld environments. |
Pinout & Package
Package: 8-lead plastic DFN (2mm × 2mm × 0.75mm) with exposed thermal pad (Pin 9, GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to inductor; internally drives PMOS/NMOS buck switches; slew-rate controlled to reduce EMI. |
| GND (Pin 2) | Ground Reference | Main signal and power return; connects to exposed pad (Pin 9) - must be low-impedance PCB ground plane. |
| ENALL (Pin 3) | Global Enable Input | MOS gate input with 5.5MΩ internal pulldown; high = enable all outputs, low = full shutdown. |
| BUCKOUT (Pin 4) | Buck Feedback Sense | Connects to buck output capacitor; monitors regulated 1.2V via internal error amplifier and reference. |
| VIN1 (Pin 5) | LDO1 Input Supply | Power source for LDO1; may be tied to VIN or a lower intermediate rail (≤VIN). |
| LDO1 (Pin 6) | LDO1 Output | Delivers regulated 2.8V; requires ≥1μF ceramic bypass to GND for stability and transient response. |
| LDO2 (Pin 7) | LDO2 Output | Delivers regulated 1.8V; requires ≥1μF ceramic bypass to GND; powered directly from VIN. |
| VIN (Pin 8) | Main Input Supply | Input for buck regulator and LDO2; requires ≥2.2μF ceramic bypass to GND near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Triple integrated regulation | Single-chip solution replaces discrete buck + dual LDOs - reduces BOM count, board area, and design complexity. |
| 2.25MHz constant-frequency operation | Enables use of small 4.7μH inductors and ceramic capacitors; supports ultra-thin portable form factors. |
| Independent LDO inputs (VIN1) | LDO1 can be powered from an intermediate rail - improves efficiency when LDO2 input voltage exceeds LDO1 requirement. |
| Internal soft-start (200μs buck / 100μs LDOs) | Prevents output overshoot and inrush current during power-up - eliminates need for external timing components. |
| Slew-rate controlled SW node | Reduces radiated EMI by limiting dV/dt without adding external snubbers or ferrites - simplifies EMC compliance. |
Applications
| Mobile Baseband Power | Digital Logic Core Supply |
|---|---|
|
Use Scenario: Powering baseband processor cores, memory interfaces, and RF transceivers in LTE smartphones. IC Role / Device Role / Timing Role: LTC3672BEDC-1 provides three independent, low-noise, fast-transient power rails: 1.2V for CPU core, 2.8V for I/O, and 1.8V for RF chipset bias. Use Value: Simultaneous load step response (10mA → 100mA on all outputs) shows <50mV deviation and <50μs recovery - ensures signal integrity during burst data transmission. |
Use Scenario: Supplying FPGA I/O banks, configuration logic, and auxiliary peripherals in handheld test equipment. IC Role / Device Role / Timing Role: LTC3672BEDC-1 acts as primary power hub - buck supplies core logic voltage, LDO1 powers high-speed SerDes I/O, LDO2 feeds analog front-end circuitry. Use Value: ±2.5% output accuracy and <1mV/mA load regulation ensure consistent timing margins across temperature and load variation. |
| Portable Medical Sensors | Wearable GPS Receivers |
|
Use Scenario: Powering ultra-low-power biosensor signal chains (ADC, op-amps, BLE radio) in patch-style monitors. IC Role / Device Role / Timing Role: LTC3672BEDC-1 delivers clean, sequenced 1.2V (digital), 2.8V (sensor bias), and 1.8V (radio) from a single coin-cell or Li-Po battery. Use Value: 260μA quiescent current and 100% duty-cycle capability near dropout extend runtime in sleep mode without compromising wake-up responsiveness. |
Use Scenario: Supporting GPS/GNSS modules with tight noise and transient requirements in fitness trackers and asset tags. IC Role / Device Role / Timing Role: LTC3672BEDC-1 supplies 1.2V to GNSS baseband, 2.8V to RF LNA, and 1.8V to serial interface - all synchronized via shared ENALL. Use Value: 2.25MHz switching avoids interference with GPS L1 band (1.575GHz); LDO2's 400mV dropout allows operation down to 2.2V input during battery sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3672BEDC-2 | Same package and pinout; identical buck (1.2V/400mA) and LDO2 (1.8V/150mA), but LDO1 = 2.8V → matches LTC3672BEDC-1 exactly. | No functional difference - LTC3672BEDC-2 is the documented production part number for this exact configuration. | Select LTC3672BEDC-2 when sourcing new production; LTC3672BEDC-1 is obsolete marking for same silicon. |
| LTC3445IUF#PBF | I²C-programmable buck (600mA) + dual 50mA LDOs in 4mm × 4mm QFN; higher integration but larger footprint and different control interface. | Requires firmware initialization and dynamic voltage scaling - unsuitable for fixed-rail, zero-software boot applications. | Choose only if programmability and higher LDO count outweigh size and complexity penalties. |
Compared with LTC3672BEDC-1, LTC3672BEDC-2 offers identical electrical performance and drop-in compatibility, while LTC3445IUF#PBF trades simplicity and size for configurability - making the former ideal for cost-sensitive, space-constrained fixed-rail designs and the latter better suited for adaptive power architectures.
Availability
LTC3672BEDC-1 is available at Aetrix Electronics and suitable for mobile baseband power, FPGA I/O supply, portable medical sensors, and wearable GPS receivers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3672BEDC-1 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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3672 series.
The LTC3672B family was designed specifically for space-constrained portable electronics needing multiple low-noise, low-quiescent-current power rails - targeting DMB/DVB-H phones, PDAs, GPS units, and multivoltage ASIC/FPGA platforms.
FAQ
What is the key functional difference between LTC3672BEDC-1 and LTC3672BEDC-2?
The LTC3672BEDC-1 and LTC3672BEDC-2 are functionally identical: both deliver 1.2V/400mA (buck), 2.8V/150mA (LDO1), and 1.8V/150mA (LDO2) from 2.9V–5.5V input in the same 2mm × 2mm DFN package. LTC3672BEDC-2 is the official orderable part number; LTC3672BEDC-1 reflects earlier marking used for the same silicon revision and is supported under the same datasheet (LTC3672B-2).
Does LTC3672BEDC-1 support 100% duty cycle operation?
Yes, the LTC3672BEDC-1 buck regulator supports 100% duty cycle operation when input voltage approaches or falls below the 1.2V output - enabling continued regulation during battery brownout conditions down to ~1.4V input (accounting for dropout). This behavior is explicitly confirmed in the LTC3672B-2 datasheet Section "Synchronous Buck Regulator".
Can LDO1 and LDO2 be powered from independent input sources?
LDO2 is powered exclusively from VIN (Pin 8). LDO1 is powered from VIN1 (Pin 5), which may be connected to VIN or to a separate intermediate rail - as long as VIN1 ≤ VIN. This allows optimized efficiency when powering 2.8V LDO1 from a 3.3V intermediate rail while supplying 1.8V LDO2 directly from a 3.8V battery, for example.
What is the minimum output capacitance required for stable operation of LTC3672BEDC-1?
The LTC3672BEDC-1 requires ≥1μF X5R/X7R ceramic capacitance on LDO1 and LDO2 outputs, ≥2.2μF on VIN, and ≥4μF effective capacitance (bias- and temperature-stable) on the buck output. The buck output capacitor must retain ≥4μF over operating conditions - typically met using a 10μF/6.3V X5R device, as validated in the Typical Application schematic (TA02).
Is the exposed thermal pad of LTC3672BEDC-1 electrically connected?
Yes, the exposed pad (Pin 9) is internally connected to GND and must be soldered to a PCB ground plane. Thermal resistance θJC = 20°C/W and θJA = 102°C/W assume full thermal pad connection - omitting this compromises thermal performance and risks junction temperature exceedance above 125°C under 400mA buck load.
LTC3672BEDC-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LTC3672BEDC-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3672BEDC-1 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 reliable?
The price and inventory of LTC3672BEDC-1 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 is usually 5 days.
3.What payment methods are accepted for LTC3672BEDC-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3672BEDC-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3672BEDC-1?
LTC3672BEDC-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3672BEDC-1 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?
For technical support, including LTC3672BEDC-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3672BEDC-1 requirements.
6.How does Aetrix verify that LTC3672BEDC-1 is sourced from the original manufacturer or authorized distributors?
All LTC3672BEDC-1 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 meets industry standards.
7.What is the process for return or replacement of LTC3672BEDC-1?
All LTC3672BEDC-1 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3672BEDC-1, 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 part is unused and in its original packaging.
Return procedure for LTC3672BEDC-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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