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Analog Devices Inc. LTC3544BEUD#TRPBF
- Part No.:
- LTC3544BEUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3544BEUD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,286
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Product details
Overview
LTC3544BEUD#TRPBF from Analog Devices (formerly Linear Technology) is a quad-channel monolithic synchronous step-down DC/DC regulator IC with independent enable control per channel, delivering 300mA, 200mA, 200mA, and 100mA output currents respectively. It operates from 2.25V to 5.5V input, uses constant-frequency current-mode control at 2.25MHz, and features 0.8V feedback reference for low-output-voltage generation - ideal for multi-rail power management in Li-ion–powered portable electronics.
For engineers reviewing the LTC3544BEUD#TRPBF datasheet, LTC3544BEUD#TRPBF pinout, LTC3544BEUD#TRPBF application, or LTC3544BEUD#TRPBF equivalent, key selection criteria include per-channel RUN pin independence, 100% duty-cycle dropout capability, pulse-skipping mode for low-load ripple suppression, and QFN-16 (3mm × 3mm) thermal performance with exposed pad grounding.
Technical Context
The LTC3544BEUD#TRPBF implements four independent current-mode buck regulators sharing a single 2.25MHz oscillator but with separate RUN pins, SW nodes, and feedback inputs. Each channel integrates matched P-channel and N-channel MOSFETs with RDS(ON) values of 0.55Ω/0.50Ω (300mA), 0.65Ω/0.60Ω (200mA), and 0.80Ω/0.75Ω (100mA) at 25°C, enabling high-efficiency operation without external diodes.
It supports soft-start (650–1200µs), overtemperature protection (125°C junction limit), and undervoltage lockout (1.9–2.25V). Pulse-skipping mode activates automatically at light loads to minimize output voltage ripple while maintaining regulation - critical for noise-sensitive analog and RF subsystems in compact battery-powered devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion/polymer batteries across full discharge curve. |
| Switching Frequency | 2.25MHz (typical) - enables use of small 1–10µH inductors and ceramic capacitors for space-constrained layouts. |
| Output Current Capability | 300mA + 200mA + 200mA + 100mA - four independent rails support mixed-signal SoC, sensor, and peripheral power domains. |
| Feedback Reference Voltage | 0.8V ±1.0% - allows precise low-voltage outputs (e.g., 0.8V, 1.2V, 1.5V, 1.8V) using standard resistor dividers. |
| Efficiency | Up to 95% - achieved via synchronous rectification and optimized FET RDS(ON), reducing heat and extending battery runtime. |
| Shutdown Current | <1µA - ensures minimal battery drain during system sleep or standby modes. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with 0.75mm profile and exposed thermal pad (Pin 17, GNDA) requiring solder connection to PCB ground for electrical integrity and thermal performance (θJA = 68°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB300 (Pin 10) | 300mA regulator feedback input | Connects to resistive divider on 300mA output rail to set regulated voltage via 0.8V reference. |
| RUN300 (Pin 9) | 300mA regulator enable | High = active; low = shutdown - independent control allows dynamic rail sequencing and power gating. |
| SW300 (Pin 8) | 300mA switch node | Drain connection of internal P/N-FET pair; ties to inductor and output capacitor for buck conversion. |
| VFB200A (Pin 2) / VFB200B (Pin 1) | 200mA regulator A/B feedback inputs | Separate inputs allow distinct output voltages and independent loop compensation per 200mA channel. |
| RUN200A (Pin 3) / RUN200B (Pin 16) | 200mA regulator A/B enable pins | Enable/disable each 200mA rail independently - supports staggered startup and subsystem-level power control. |
| VFB100 (Pin 11) / RUN100 (Pin 12) | 100mA regulator feedback and enable | Dedicated low-current rail for bias, reference, or always-on logic with minimal quiescent draw. |
| PVIN (Pin 7) / PGND (Pin 6) | Power input and return for 300mA/200mA channels | Shared high-current path; requires local 4.7µF+ ceramic decoupling between PVIN and PGND. |
| VCC (Pin 15) / GNDA (Pin 14) | Control supply and analog ground | VCC powers internal reference and logic; GNDA is signal ground for 100mA channel and error amplifiers - must be isolated from PGND at board level. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent buck regulators | Four fully decoupled switching channels eliminate cross-regulation and enable flexible rail sequencing and fault isolation. |
| 100% duty-cycle operation | Enables ultra-low dropout mode when VIN approaches VOUT - extends usable battery life down to ~2.3V for 2.2V rails. |
| Pulse-skipping at light load | Maintains tight output regulation and sub-10mVpp ripple under µA–mA loads - essential for ADC references and RF LDO bypassing. |
| No external Schottky diodes required | Integrated synchronous MOSFETs reduce BOM count, PCB area, and conduction losses versus asynchronous designs. |
| Thermally enhanced QFN package | Exposed pad (Pin 17) soldered to PCB ground delivers 68°C/W θJA, supporting >1W total dissipation in compact layouts. |
Applications
| Mobile Baseband Power | Digital Camera Sensor Rails |
|---|---|
Use Scenario: Powering multi-core application processor, DDR memory, and baseband modem in smartphones. IC Role / Device Role / Timing Role: Provides four tightly regulated, sequenced voltage rails (e.g., 1.2V core, 1.5V I/O, 1.8V interface, 0.8V analog) from single Li-ion cell. Use Value: Eliminates need for discrete LDOs or multiple converters; 2.25MHz switching avoids AM radio band interference and reduces filter size. |
Use Scenario: Supplying image sensor, ISP, flash LED driver, and microcontroller in compact digital still cameras. IC Role / Device Role / Timing Role: Delivers low-noise 2.8V (sensor), 1.8V (interface), 1.2V (core), and 3.3V (flash) rails with independent enable control for power-state transitions. Use Value: Pulse-skipping mode suppresses switching noise during exposure; 100% duty cycle sustains operation as battery drops below 3V. |
| Wireless Modem Subsystem | Portable Medical Instrumentation |
Use Scenario: Powering LTE/Wi-Fi/Bluetooth coexistence modules with strict EMI and transient response requirements. IC Role / Device Role / Timing Role: Generates clean, fast-settling rails for RF transceivers, PA bias, and digital baseband - with per-rail RUN control for dynamic power scaling. Use Value: Current-mode architecture delivers <10µs load-step response; 2.25MHz frequency simplifies EMI filtering and meets CISPR-22 Class B limits. |
Use Scenario: Powering precision analog front-end, low-power MCU, display driver, and wireless telemetry in handheld diagnostic devices. IC Role / Device Role / Timing Role: Supplies stable 3.3V (MCU), 2.5V (ADC reference), 1.8V (digital logic), and 5.0V (display backlight) from coin-cell or rechargeable battery. Use Value: Shutdown current <1µA preserves battery during standby; 0.8V reference enables accurate low-voltage sensing without external precision references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple 1.5A/1.5A/1.5A + LDO; fixed 1.2/1.5/1.8V outputs; no independent RUN pins; 2.25MHz not supported. | Fixed-output, non-programmable rails; better for cost-sensitive, fixed-voltage systems without sequencing needs. | Select when output voltages are static and board space permits larger 4x4mm QFN; avoid if per-rail enable or adjustable VOUT required. |
| MAX8646ETE+ | Quad 1.2A/1.2A/0.6A/0.6A; 3MHz switching; integrated I²C interface; higher quiescent current (25µA). | Supports dynamic voltage scaling via I²C; suited for adaptive SoC power where firmware control is needed. | Choose when real-time rail reconfiguration or telemetry (voltage/current readback) is required; not suitable for ultra-low-IQ battery-critical apps. |
Compared with TPS65023RSBR and MAX8646ETE+, the LTC3544BEUD#TRPBF offers superior flexibility through independent RUN pins and programmable feedback, lower shutdown current (<1µA vs 25µA/5µA), and optimized 2.25MHz operation for minimal passive size - making it preferred for compact, battery-life–sensitive, multi-rail portable designs.
Availability
LTC3544BEUD#TRPBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera sensor rails, wireless modem subsystems, portable medical instrumentation, and industrial handheld terminals requiring stable component supply and long-term production continuity.
Supply support for LTC3544BEUD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3544BEUD#TRPBF belongs to Linear's high-density, high-efficiency monolithic DC/DC regulator product line, designed specifically for space- and battery-constrained portable electronics requiring multiple low-noise, independently controllable power rails.
FAQ
What is the maximum output current per channel on the LTC3544BEUD#TRPBF?
The LTC3544BEUD#TRPBF provides four independent output channels rated at 300mA (SW300), 200mA (SW200A), 200mA (SW200B), and 100mA (SW100). These are continuous DC current capabilities under thermal limits; peak switch current limits are 600mA, 400mA, 400mA, and 300mA respectively - confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
Does the LTC3544BEUD#TRPBF require external Schottky diodes?
No, the LTC3544BEUD#TRPBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs for each buck channel, eliminating conduction losses and thermal overhead associated with external diodes - a key feature explicitly stated in the datasheet's Features section and Functional Diagrams.
How is output voltage programmed on the LTC3544BEUD#TRPBF?
Each channel's output voltage is programmed using an external resistive divider connected between VOUT, VFBx, and GND. The formula is VOUT = 0.8V × (1 + R1/R2), where R1 connects to VOUT and R2 connects to GND. Total divider current should remain below 10µA (recommended R1+R2 ≤ 100kΩ) to minimize load on the 0.8V reference - per the Applications Information section.
What thermal considerations apply to the LTC3544BEUD#TRPBF's exposed pad?
The exposed pad (Pin 17, GNDA) of the LTC3544BEUD#TRPBF must be soldered to a PCB copper pour tied to analog ground. This connection is mandatory for both electrical reference stability and thermal performance - the datasheet specifies θJA = 68°C/W only when the pad is properly soldered. Failure to do so risks exceeding the 125°C junction temperature limit under sustained load.
Can all four channels of the LTC3544BEUD#TRPBF operate simultaneously?
Yes, all four channels of the LTC3544BEUD#TRPBF can operate simultaneously. The datasheet confirms this in efficiency graphs (e.g., "All Channels 50% Loaded") and specifies total input bias current of 825–1100µA with all regulators enabled. Independent RUN pins allow coordinated or staggered startup, and thermal design must account for cumulative power dissipation across all active channels.
LTC3544BEUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 100mA, 200mA(2), 300mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3544BEUD#TRPBF FAQ
1.How can I place an order for LTC3544BEUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3544BEUD#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 LTC3544BEUD#TRPBF reliable?
The price and inventory of LTC3544BEUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3544BEUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3544BEUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3544BEUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3544BEUD#TRPBF?
LTC3544BEUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3544BEUD#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 LTC3544BEUD#TRPBF?
For technical support, including LTC3544BEUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3544BEUD#TRPBF requirements.
6.How does Aetrix verify that LTC3544BEUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3544BEUD#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 LTC3544BEUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3544BEUD#TRPBF?
All LTC3544BEUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3544BEUD#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 LTC3544BEUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3544BEUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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