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Analog Devices Inc. LTC3543EDCB#TRMPBF
- Part No.:
- LTC3543EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3543EDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,569
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Product details
Overview
LTC3543EDCB#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down buck regulator with 600mA output current, 2.5V–5.5V input range, and 2.25MHz fixed-frequency operation-optionally spread-spectrum or PLL-synchronized (1MHz–3MHz). It delivers ±2% output voltage accuracy, operates in Burst Mode® with 45μA quiescent current, and supports 100% duty cycle for low-dropout battery operation in portable Li-Ion systems.
For engineers reviewing the LTC3543EDCB#TRMPBF datasheet, LTC3543EDCB#TRMPBF pinout, LTC3543EDCB#TRMPBF application, or LTC3543EDCB#TRMPBF equivalent, key selection criteria include its integrated P/N-channel MOSFETs, no-Schottky-diode architecture, ceramic-capacitor stability, soft-start, overtemperature protection, and MODE-pin-configurable operating modes (Burst, Pulse Skip, Spread Spectrum, PLL).
Technical Context
The LTC3543EDCB#TRMPBF uses current-mode control with internal P-channel main switch (RDS(ON) = 0.45Ω) and N-channel synchronous switch (RDS(ON) = 0.35Ω), enabling excellent line/load transient response and stable operation with ceramic output capacitors. Its oscillator supports three configurable modes via the MODE pin: Burst Mode (MODE = GND), Pulse Skip (MODE = VIN), or PLL synchronization (MODE = external clock, 1–3MHz capture range).
Spread spectrum operation (MODE = VFB) randomizes switching frequency between 2MHz and 3MHz using a CAP pin capacitor (1–10nF), reducing peak EMI by ≈20dBm without compromising regulation. Soft-start is internally implemented, and short-circuit protection disables the main FET during overcurrent until inductor current decays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600mA continuous - sufficient for core logic rails in handheld devices |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-Ion (2.7–4.2V) plus margin |
| Switching Frequency | 2.25MHz nominal, 1–3MHz PLL lockable - enables <3mm × 3mm inductor footprint |
| Quiescent Current | 45μA in Burst Mode - extends runtime at light loads in always-on subsystems |
| Feedback Voltage | 0.6V ±2% - sets output via resistor divider; enables 1.2V–5.5V programmable VOUT |
| Peak Inductor Current | 1A - supports high ripple tolerance and robust transient handling |
| Shutdown Current | <1μA - meets ultra-low-power system sleep-state requirements |
| Efficiency | Up to 95% - minimizes thermal load in sealed enclosures and battery-constrained designs |
Pinout & Package
Supplied in a low-profile (0.75mm height) 2mm × 3mm 6-lead DFN package with exposed pad (Pin 7) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt; requires tight layout and Kelvin return path |
| CAP (Pin 2) | PLL/spread-spectrum filter | Accepts 1–10nF capacitor to ground; stabilizes frequency modulation or PLL loop dynamics |
| MODE (Pin 3) | Operating mode selector | GND = Burst Mode; VFB = Pulse Skip + Spread Spectrum; VIN = Pulse Skip; external clock = PLL |
| VFB (Pin 4) | Feedback input | Senses resistor-divider output; regulates VOUT to 0.6V reference with ±2% accuracy |
| RUN (Pin 5) | Enable control | >1.5V enables regulator; <0.3V forces shutdown (<1μA IQ); must not float |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and switches; accepts 2.5–5.5V with overvoltage clamp to 6V |
| Exposed Pad (Pin 7) | Thermal/Ground plane | Internally connected to GND; mandatory PCB solder connection for thermal dissipation (θJA = 64°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates external Schottky diode, reduces BOM count, and improves efficiency across load range |
| Burst Mode® operation | Reduces quiescent current to 45μA at light loads while maintaining regulation-critical for battery longevity |
| 100% duty-cycle capability | Enables dropout operation down to VIN ≈ VOUT, extending usable battery voltage range |
| Ceramic-capacitor stability | No ESR dependency in control loop-allows use of small, low-ESR X5R/X7R ceramics for minimal footprint and ripple |
| Spread spectrum & PLL synchronization | Reduces peak EMI by spreading noise energy; PLL allows system-level clock alignment to avoid beat frequencies |
| Overtemperature protection | Thermal shutdown at TJ = 125°C prevents damage during sustained overload or poor airflow |
Applications
| Portable Instruments | Cellular Phones |
|---|---|
Use Scenario: Powering microcontroller cores, sensors, and RF front-ends in handheld test equipment with single Li-Ion battery. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 1.2V–3.3V rails with fast transient response to bursty sensor acquisition. Use Value: Burst Mode® extends battery life >3× vs continuous operation at standby; 2.25MHz switching permits compact 2.2μH inductors. | Use Scenario: Supplying application processor I/O and memory interfaces in LTE smartphones with tight EMI limits. IC Role / Device Role / Timing Role: Synchronous buck regulator configured in Spread Spectrum mode to meet FCC Part 15 Class B conducted emissions. Use Value: ≈20dBm reduction in fundamental/harmonic peak noise eliminates need for ferrite beads or shielding cans. |
| Wearable Health Monitors | Industrial IoT Edge Nodes |
Use Scenario: Providing ultra-low-noise 1.8V supply to ADCs and Bluetooth LE radios in compact wrist-worn biosensors. IC Role / Device Role / Timing Role: Low-quiescent-current regulator with soft-start and precise feedback to avoid sensor bias shift during power-up. Use Value: 45μA Burst Mode current enables multi-week operation on 100mAh coin cell; ±2% VOUT accuracy ensures consistent ADC reference scaling. | Use Scenario: Powering ARM Cortex-M based controllers and LoRa transceivers in battery- or energy-harvesting–powered remote sensors. IC Role / Device Role / Timing Role: Highly efficient, thermally robust regulator supporting wide input (2.5–5.5V) from supercapacitors or solar harvesters. Use Value: 95% peak efficiency minimizes self-heating in sealed enclosures; 100% duty cycle maintains regulation as input decays below 2.0V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | 3MHz fixed frequency; 400mA output; 2.05–6.5V input; no spread spectrum or PLL | Lacks EMI-reduction features; lower current rating limits use in higher-power peripherals | Select when board space is critical and EMI is managed externally; verify 400mA sufficiency for target load |
| MAX17503GCU+T | 2.7–5.5V input; 600mA output; 2.1MHz switching; no Burst Mode; requires external MOSFETs | Higher external component count; no integrated synchronous switches; higher quiescent current (250μA) | Prefer when adjustable frequency or higher voltage margin is needed; avoid if minimizing BOM or battery life is priority |
Compared with TPS62231DRYT and MAX17503GCU+T, the LTC3543EDCB#TRMPBF uniquely combines integrated synchronous FETs, sub-50μA Burst Mode, spread spectrum, and PLL synchronization in a 2mm × 3mm DFN-making it optimal for space-constrained, battery-powered, EMI-sensitive applications where efficiency and feature integration are non-negotiable.
Availability
LTC3543EDCB#TRMPBF is available at Aetrix Electronics and suitable for portable instruments, cellular phones, wearable health monitors, and industrial IoT edge nodes requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3543EDCB#TRMPBF 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.
The LTC3543EDCB#TRMPBF belongs to Linear's µPower synchronous buck regulator product line, designed specifically for battery-operated portable electronics demanding high efficiency, ultra-low quiescent current, and advanced EMI mitigation without external components.
FAQ
What is the maximum output current supported by the LTC3543EDCB#TRMPBF?
The LTC3543EDCB#TRMPBF delivers up to 600mA of continuous output current under typical conditions (TA = 25°C, 2.5V ≤ VIN ≤ 5.5V). Peak inductor current capability is rated at 1A, supporting transient loads and higher ripple margins. Actual achievable output current decreases at low input voltages (e.g., 2.5V) due to increased conduction losses-see Figure 2 in the datasheet for derating curves.
Does the LTC3543EDCB#TRMPBF require an external Schottky diode?
No, the LTC3543EDCB#TRMPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, enabling full synchronous rectification and eliminating diode forward-voltage losses. This design improves efficiency-especially at light loads-and reduces thermal stress and board area.
How is the output voltage programmed on the LTC3543EDCB#TRMPBF?
The output voltage of the LTC3543EDCB#TRMPBF is set using an external resistor divider connected between VOUT, VFB, and GND. The feedback pin regulates to a precise 0.6V reference, so VOUT = 0.6V × (1 + R1/R2). For example, R1 = 200kΩ and R2 = 100kΩ yields 1.8V. Remote sensing is supported by routing the divider directly from the load point.
What are the MODE pin configuration options for the LTC3543EDCB#TRMPBF?
The MODE pin on the LTC3543EDCB#TRMPBF selects among four operating modes: GND → Burst Mode; VFB → Pulse Skip with Spread Spectrum; VIN → Pulse Skip; or external clock signal → PLL synchronization (1–3MHz). Each mode configures internal control logic and oscillator behavior-no external components are needed except a capacitor on CAP for Spread Spectrum or PLL.
Is the LTC3543EDCB#TRMPBF stable with ceramic output capacitors?
Yes, the LTC3543EDCB#TRMPBF is explicitly designed to be stable with ceramic output capacitors. Its current-mode control architecture does not rely on output capacitor ESR for loop stability, allowing use of low-ESR X5R/X7R ceramics. This enables smaller size, lower output ripple, and improved transient response compared to electrolytic or tantalum solutions.
LTC3543EDCB#TRMPBF 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-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):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3543EDCB#TRMPBF FAQ
1.How can I place an order for LTC3543EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3543EDCB#TRMPBF 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 LTC3543EDCB#TRMPBF reliable?
The price and inventory of LTC3543EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3543EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3543EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3543EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3543EDCB#TRMPBF?
LTC3543EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3543EDCB#TRMPBF 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 LTC3543EDCB#TRMPBF?
For technical support, including LTC3543EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3543EDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC3543EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3543EDCB#TRMPBF 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 LTC3543EDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3543EDCB#TRMPBF?
All LTC3543EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3543EDCB#TRMPBF, 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 LTC3543EDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3543EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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