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Analog Devices Inc. LTC3542ES6#TRPBF
- Part No.:
- LTC3542ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3542ES6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
LTC3542ES6#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter optimized for single Li-Ion battery-powered portable systems. It delivers up to 500mA output current, operates at a fixed 2.25MHz switching frequency, supports 2.5V–5.5V input, and regulates output from 0.6V to VIN with ±2% accuracy. Its 100% duty cycle enables low-dropout operation critical for battery life extension.
For engineers reviewing the LTC3542ES6#TRPBF datasheet, LTC3542ES6#TRPBF pinout, LTC3542ES6#TRPBF application, or LTC3542ES6#TRPBF equivalent, key selection criteria include quiescent current (26μA in Burst Mode), external synchronization capability (1MHz–3MHz), internal MOSFET integration eliminating Schottky diodes, ceramic capacitor compatibility, and thermal performance in TSOT-23 packaging.
Technical Context
The LTC3542ES6#TRPBF employs a constant-frequency current-mode control architecture with an internal 0.6V reference and slope compensation. Its dual-MOSFET synchronous rectification eliminates external diode losses and enables high efficiency (up to 96%) across load ranges.
Operation modes are selected via the MODE/SYNC pin: grounding enables Burst Mode (26μA IQ, higher ripple), tying to VIN enables pulse-skip mode (lower noise), and applying an external 1MHz–3MHz clock synchronizes switching while forcing pulse-skip. The RUN pin provides enable/disable control with <1μA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - matches single-cell Li-Ion battery discharge profile without external regulation. |
| Output Current | 500mA max - sufficient for core logic, RF transceivers, and sensor subsystems in handheld devices. |
| Switching Frequency | 2.25MHz (internal) - enables use of compact 2.2μH inductors and 10μF ceramic capacitors, minimizing PCB footprint. |
| Quiescent Current | 26μA in Burst Mode - extends battery runtime during standby or light-load operation. |
| Feedback Reference | 0.6V ±2% - allows precise output programming down to 0.6V using standard resistor dividers. |
| Shutdown Current | <1μA - ensures negligible battery drain when system is powered off. |
| Peak Switch Current | 1000mA - provides margin for transient loads and inductor saturation avoidance. |
| Output Ripple | <20mVP-P typical - meets noise-sensitive analog and RF circuit requirements without additional filtering. |
Pinout & Package
The LTC3542ES6#TRPBF is housed in a 6-lead plastic TSOT-23 package (2.9mm × 1.6mm × 0.85mm), optimized for space-constrained portable designs. Exposed pad is not present in TSOT-23 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Accepts 2.5V–5.5V supply; requires local 10μF ceramic decoupling to minimize high-frequency noise injection. |
| GND (Pin 2) | Ground Reference | Primary return path for power and signal currents; must be connected to low-impedance PCB ground plane. |
| VFB (Pin 3) | Feedback Input | Senses divided output voltage; internal 0.6V reference sets regulation point; high-impedance node requiring clean routing away from SW. |
| RUN (Pin 4) | Enable Control | Active-high logic input; >1.5V enables converter, <0.3V forces shutdown with <1μA supply draw. |
| MODE/SYNC (Pin 5) | Mode Selection & Sync | Configures Burst Mode (GND), Pulse-Skip (VIN), or external clock sync (1MHz–3MHz); must not be left floating. |
| SW (Pin 6) | Switch Node | Connects to inductor; carries high dv/dt square wave; requires short, low-inductance trace to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated P-channel and N-channel MOSFETs eliminate external Schottky diode, reducing BOM count and improving efficiency by ~5% over asynchronous designs. |
| Burst Mode Operation | Reduces quiescent current to 26μA at light loads while maintaining regulation, directly extending battery life in sleep states of cellular phones and PDAs. |
| 100% Duty Cycle Capability | Enables dropout operation down to VOUT ≈ VIN − ILOAD × RDS(ON), preserving output voltage as battery discharges below regulated level. |
| Ceramic Capacitor Optimized | Stable with low-ESR X5R/X7R ceramics; achieves <20mVP-P ripple and eliminates need for tantalum or electrolytic output capacitors. |
| Internal Soft-Start | Linearly ramps internal reference over ~1ms, limiting inrush current during startup and preventing output overshoot into sensitive downstream circuitry. |
| Overtemperature Protection | Thermal shutdown activates at TJ ≈ 160°C, disabling both switches and placing SW in high-impedance state to prevent damage under sustained overload or poor thermal conditions. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-Ion cell during active call and standby modes. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.8V/2.5V core voltage with fast load transient response to handle bursty RF transmit demands. Use Value: 96% peak efficiency and 26μA Burst Mode IQ extend talk time and standby duration; 2.25MHz operation minimizes solution size for tight board real estate. | Use Scenario: Supplying 3.3V logic and 1.2V PHY interface in DSL or Wi-Fi modems operating on battery backup. IC Role / Device Role / Timing Role: Main system power rail generator with external clock synchronization to avoid interference with communication band harmonics. Use Value: 1MHz–3MHz SYNC range allows alignment with system clock domain, reducing conducted EMI; low output ripple ensures clean signaling for high-speed serial interfaces. |
| Digital Cameras | MP3 Players |
Use Scenario: Providing adjustable core voltage to image sensor and ISP during capture, playback, and idle states. IC Role / Device Role / Timing Role: Programmable output buck converter supporting multiple voltage rails (e.g., 1.2V sensor core, 2.8V lens driver) via feedback divider reconfiguration. Use Value: 0.6V reference enables precise low-voltage generation; 100% duty cycle maintains output as battery drops to 2.7V, avoiding premature shutdown during video recording. | Use Scenario: Powering audio codec, flash memory, and display controller in portable media players with varying load profiles. IC Role / Device Role / Timing Role: High-efficiency power source delivering 1.8V to digital logic and 3.3V to analog audio stages with minimal thermal rise in sealed enclosures. Use Value: Internal MOSFETs and ceramic-capacitor compatibility reduce heat generation and component height; soft-start prevents pop-noise in headphones during power-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | Fixed 3.3V output (non-adjustable); 2.05MHz switching; 400mA max output; 17μA IQ in PWM mode. | Not suitable for adjustable-output or >400mA applications; lacks external SYNC and Burst Mode. | Select only if fixed 3.3V rail and lower IQ in PWM mode are prioritized over flexibility and light-load efficiency. |
| MAX1724EZT+T | 2.5V–5.5V input; 600mA output; 2.2MHz switching; 22μA IQ in skip mode; no internal MOSFETs (external FETs required). | Requires external high-side and low-side MOSFETs, increasing layout complexity and BOM cost; no integrated soft-start. | Choose only when higher output current or custom MOSFET selection justifies added design effort and component count. |
Compared with TPS62231DRYT and MAX1724EZT+T, the LTC3542ES6#TRPBF offers adjustable output voltage, integrated dual-MOSFETs, true Burst Mode for ultra-low IQ, and robust thermal protection - making it superior for space- and battery-life-constrained portable designs requiring design flexibility.
Availability
LTC3542ES6#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and digital cameras requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3542ES6#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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3542ES6#TRPBF belongs to Linear's µPower synchronous buck converter family, designed specifically for battery-powered portable electronics where efficiency at light loads, small solution size, and reliable low-voltage operation are critical.
FAQ
What is the maximum output current capability of the LTC3542ES6#TRPBF?
The LTC3542ES6#TRPBF is rated for continuous output current up to 500mA. Its internal power switches support a peak switch current of 1000mA, providing headroom for transient loads and ensuring stable operation under dynamic conditions. Actual achievable output depends on input voltage, ambient temperature, PCB thermal design, and inductor selection - for example, at VIN = 2.7V and TA = 85°C, derating may apply due to increased RDS(ON) and thermal limits.
Does the LTC3542ES6#TRPBF require an external Schottky diode?
No, the LTC3542ES6#TRPBF does not require an external Schottky diode. It integrates both a P-channel high-side and N-channel low-side MOSFET in a synchronous buck configuration, enabling efficient rectification without conduction losses associated with external diodes. This integration reduces component count, improves full-load efficiency by ~3–5%, and eliminates reverse recovery issues common in diode-based solutions.
How does the MODE/SYNC pin function on the LTC3542ES6#TRPBF?
The MODE/SYNC pin on the LTC3542ES6#TRPBF serves three functions: grounding selects Burst Mode (26μA IQ, higher ripple), connecting to VIN selects Pulse-Skip Mode (lower noise, reduced efficiency at light loads), and applying a 1MHz–3MHz external clock synchronizes switching while automatically entering Pulse-Skip Mode. The pin must never be left floating, as undefined logic levels can cause erratic operation or increased EMI.
What is the purpose of the RUN pin on the LTC3542ES6#TRPBF?
The RUN pin on the LTC3542ES6#TRPBF is an active-high enable input that controls device startup and shutdown. Driving RUN above 1.5V enables normal operation; pulling it below 0.3V places the LTC3542ES6#TRPBF in shutdown mode, reducing supply current to <1μA. This pin supports system-level power sequencing and battery-saving deep-sleep states, and must be actively driven - floating the pin risks unpredictable behavior.
Can the LTC3542ES6#TRPBF operate with ceramic output capacitors?
Yes, the LTC3542ES6#TRPBF is explicitly designed to operate stably 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 or X7R ceramics (e.g., 10μF). This enables very low output ripple (<20mVP-P typical), smaller PCB area, and improved reliability compared to tantalum or aluminum electrolytic alternatives.
LTC3542ES6#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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:
- 500mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3542ES6#TRPBF FAQ
1.How can I place an order for LTC3542ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3542ES6#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 LTC3542ES6#TRPBF reliable?
The price and inventory of LTC3542ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3542ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3542ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3542ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3542ES6#TRPBF?
LTC3542ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3542ES6#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 LTC3542ES6#TRPBF?
For technical support, including LTC3542ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3542ES6#TRPBF requirements.
6.How does Aetrix verify that LTC3542ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3542ES6#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 LTC3542ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3542ES6#TRPBF?
All LTC3542ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3542ES6#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 LTC3542ES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC3542ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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