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Analog Devices Inc. LTC3543EDCB#TRPBF
- Part No.:
- LTC3543EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3543EDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,594
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Product details
Overview
LTC3543EDCB#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC buck regulator with integrated P- and N-channel MOSFETs, delivering up to 600mA output current from a 2.5V–5.5V input. It operates at a fixed 2.25MHz switching frequency (PLL-synchronizable from 1MHz to 3MHz), achieves up to 95% efficiency, and maintains ±2% output voltage accuracy. It is designed for single-cell Li-ion portable systems requiring low quiescent current and EMI-sensitive environments.
For engineers reviewing the LTC3543EDCB#TRPBF datasheet, LTC3543EDCB#TRPBF pinout, LTC3543EDCB#TRPBF application, or LTC3543EDCB#TRPBF equivalent, key selection criteria include its Burst Mode® operation (45μA IQ), spread spectrum noise reduction, 100% duty cycle low-dropout capability, and compatibility with ceramic input/output capacitors in space-constrained DFN packaging.
Technical Context
The LTC3543EDCB#TRPBF uses current-mode control with internal slope compensation to ensure stability across all duty cycles, including >40% where subharmonic oscillation is suppressed by a patented scheme. Its dual-MOSFET architecture eliminates external Schottky diodes and enables high-efficiency regulation down to near-input-output voltage differentials.
Three distinct operating modes are selectable via the MODE pin: Burst Mode® (GND), pulse-skip (VIN), spread-spectrum pulse-skip (VFB), or PLL-synchronized (external clock). The CAP pin serves dual roles - as loop filter capacitor node in PLL mode and as spread-spectrum smoothing capacitor - with recommended values of 1nF–10nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600mA continuous - supports compact power rails in handheld instruments and cellular baseband subsystems. |
| Input Voltage Range | 2.5V to 5.5V - matches single Li-ion battery voltage range (2.7V–4.2V typical), enabling direct battery connection without pre-regulation. |
| Switching Frequency | 2.25MHz nominal, 1MHz–3MHz PLL-lockable - allows use of ≤3.3μH inductors and <10μF ceramic output caps, minimizing board area. |
| Quiescent Current | 45μA in Burst Mode®, <1μA in shutdown - extends runtime in always-on sensor nodes and standby circuits. |
| Feedback Voltage | 0.6V ±2% - sets precise output via resistor divider; enables 1.2V–5.5V programmable VOUT with remote sensing capability. |
| Peak Inductor Current | 1A - provides margin for transient load steps and ensures stable operation under 600mA steady-state with typical 2.2μH–4.7μH inductors. |
| RDS(ON) | P-FET: 0.45Ω, N-FET: 0.35Ω @ 100mA - minimizes conduction loss at light-to-moderate loads, supporting >90% efficiency at 100mA–500mA. |
Pinout & Package
Package: 6-lead (2mm × 3mm) plastic DFN with exposed thermal pad (Pin 7 = GND). Height: 0.75mm - suitable for ultra-thin portable designs and stacked PCB assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high dv/dt switching waveform - requires tight layout, minimal trace length, and ground plane underneath. |
| CAP (Pin 2) | Spread spectrum / PLL loop filter node | Accepts 1nF–10nF capacitor to ground; stabilizes frequency modulation in spread spectrum mode and filters PLL control voltage. |
| MODE (Pin 3) | Operating mode selector | Logic-level input: GND = Burst Mode®, VIN = pulse-skip, VFB = spread-spectrum pulse-skip, external clock = PLL synchronization. |
| VFB (Pin 4) | Feedback input | Senses resistor-divider output; regulates VOUT to 0.6V reference - enables precision output programming and remote sensing. |
| RUN (Pin 5) | Enable/shutdown control | Active-high logic: >1.5V enables regulator, <0.3V disables it (<1μA supply current); must not be left floating. |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and power switches; requires local 10μF ceramic bypass capacitor with low ESR. |
| Exposed Pad (Pin 7) | Thermal and electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation (θJA = 64°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 45μA at light loads while maintaining regulated output - critical for battery life in intermittently active IoT sensors. |
| Integrated synchronous MOSFETs | Eliminates need for external Schottky diode, reducing BOM count, footprint, and forward-voltage losses - improves efficiency by ~5% vs asynchronous designs. |
| Spread spectrum modulation | Randomly varies switching frequency between 2MHz–3MHz - lowers peak EMI by ≈20dBm, easing compliance with CISPR 22 Class B radiated emissions limits. |
| 100% duty cycle operation | Enables dropout regulation when VIN approaches VOUT - extends usable battery voltage range down to ~100mV above setpoint, maximizing energy extraction. |
| Ceramic capacitor compatibility | Stable with zero-ESR ceramics on input and output - permits ultra-low-profile, high-reliability power stages without tantalum or electrolytic components. |
Applications
| Portable Medical Sensors | Smartphone Baseband Power |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with Bluetooth LE radio and analog front-end. IC Role / Device Role / Timing Role: Primary 1.8V/600mA power rail for RF transceiver and ADC subsystem. Use Value: Burst Mode® extends battery life beyond 7 days; spread spectrum prevents RF interference with BLE transmission. |
Use Scenario: Application processor core voltage rail in LTE smartphone with dynamic DVFS scaling. IC Role / Device Role / Timing Role: Synchronous buck regulator supplying 1.2V core voltage with fast load transient response. Use Value: Current-mode control delivers <10μs recovery from 100mA→600mA load step; 2.25MHz operation fits within tight PCB stackup. |
| Wearable Fitness Tracker | Industrial Handheld Scanner |
Use Scenario: Optical heart-rate sensor module powered by coin cell or small Li-ion. IC Role / Device Role / Timing Role: Efficient 3.3V rail generation from 3.6V nominal battery, supporting OLED display and photodiode amplifier. Use Value: 100% duty cycle operation sustains regulation until battery drops to 3.35V; 0.75mm profile fits 8mm-thick wristband enclosure. |
Use Scenario: Ruggedized barcode scanner with laser driver, imager, and Wi-Fi SoC. IC Role / Device Role / Timing Role: Main 1.5V/600mA supply for image signal processor and wireless interface IC. Use Value: Overtemperature protection prevents thermal runaway during extended scanning; exposed pad ensures reliable operation at 65°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | Fixed 3MHz switching frequency; no spread spectrum or PLL sync; 400mA max output; 2.05V–6.0V input. | Lacks EMI mitigation features; lower current rating limits use in higher-power peripherals. | Prefer when board space is more constrained than EMI requirements, and load stays below 400mA. |
| MAX17503GCU+T | 4.5V–60V input range; 600mA output; external MOSFETs required; no integrated sync FETs; no Burst Mode®. | Designed for industrial/high-voltage inputs; lacks low-IQ sleep modes needed for battery operation. | Choose only for wide-input industrial applications where LTC3543EDCB#TRPBF's 5.5V max input is insufficient. |
Compared with TPS62231DRVR and MAX17503GCU+T, the LTC3543EDCB#TRPBF uniquely combines 600mA capability, sub-50μA Burst Mode® IQ, spread spectrum, and PLL synchronization in a 2mm×3mm DFN - making it optimal for EMI-sensitive, battery-powered portable electronics where size, efficiency, and noise performance are jointly critical.
Availability
LTC3543EDCB#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, smartphone baseband power, wearable fitness trackers, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3543EDCB#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.
The LTC3543EDCB#TRPBF belongs to Linear's µPower synchronous buck regulator family, engineered specifically for ultra-low-noise, high-efficiency power conversion in space- and battery-constrained portable electronics.
FAQ
What is the maximum output current capability of the LTC3543EDCB#TRPBF?
The LTC3543EDCB#TRPBF delivers up to 600mA continuous output current under typical conditions (VIN ≥ 2.7V, TA ≤ 85°C, proper thermal layout). Peak inductor current capability is rated at 1A, providing headroom for transient load steps. Derating applies at low input voltages - e.g., at VIN = 2.5V and VOUT = 1.5V, max output current drops to ~500mA per Figure 2 in the datasheet. The LTC3543EDCB#TRPBF maintains regulation across this range using its 100% duty cycle feature.
How does the MODE pin configure operating modes on the LTC3543EDCB#TRPBF?
The MODE pin on the LTC3543EDCB#TRPBF selects among four distinct operating modes: grounding the pin enables Burst Mode® (45μA IQ); connecting to VIN activates pulse-skip mode; tying to VFB enables pulse-skip with spread spectrum; and applying an external 1MHz–3MHz clock signal enables PLL synchronization. Each configuration alters switching behavior, EMI profile, and light-load efficiency. The LTC3543EDCB#TRPBF requires no external pull-up/down resistors - direct connection suffices.
Can the LTC3543EDCB#TRPBF operate with ceramic capacitors only?
Yes, the LTC3543EDCB#TRPBF is fully stable with ceramic input (CIN) and output (COUT) capacitors due to its current-mode control architecture, which does not rely on output capacitor ESR for loop stability. Recommended types are X5R or X7R dielectrics for best voltage/temperature coefficient performance. A 10μF X5R ceramic at VIN and 10μF at VOUT are typical; the LTC3543EDCB#TRPBF also supports smaller values (e.g., 4.7μF) when paired with appropriate inductor selection.
What is the purpose of the CAP pin on the LTC3543EDCB#TRPBF?
The CAP pin on the LTC3543EDCB#TRPBF serves two critical functions: in spread spectrum mode, it connects to a 1nF–10nF capacitor to ground to smooth frequency transitions and reduce spectral peaks; in PLL mode, it forms part of the loop filter - the external capacitor integrates charge pump current to generate the VCO control voltage. In both cases, the LTC3543EDCB#TRPBF requires the capacitor to be placed close to the pin with short traces to maintain stability and noise immunity.
Does the LTC3543EDCB#TRPBF provide overtemperature protection?
Yes, the LTC3543EDCB#TRPBF includes thermal shutdown protection that disables switching and places the device in a low-power state when junction temperature exceeds approximately 125°C. Recovery occurs automatically once the die cools below the hysteresis threshold (~15°C below trip point). This protection is independent of other fault conditions and remains active across all operating modes. The LTC3543EDCB#TRPBF relies on proper PCB thermal design - especially soldering the exposed pad to a ground plane - to ensure effective heat dissipation and avoid premature shutdown.
LTC3543EDCB#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-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#TRPBF FAQ
1.How can I place an order for LTC3543EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3543EDCB#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 LTC3543EDCB#TRPBF reliable?
The price and inventory of LTC3543EDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3543EDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3543EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3543EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3543EDCB#TRPBF?
LTC3543EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3543EDCB#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 LTC3543EDCB#TRPBF?
For technical support, including LTC3543EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3543EDCB#TRPBF requirements.
6.How does Aetrix verify that LTC3543EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3543EDCB#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 LTC3543EDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3543EDCB#TRPBF?
All LTC3543EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3543EDCB#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 LTC3543EDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3543EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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