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Analog Devices Inc. LTC3542ES6#TRMPBF
- Part No.:
- LTC3542ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3542ES6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,543
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Product details
Overview
LTC3542ES6#TRMPBF 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 with 96% peak efficiency, 2.25MHz fixed switching frequency, and 2.5V–5.5V input range. Its 100% duty cycle operation enables low-dropout regulation critical for battery life extension in handheld devices.
For engineers reviewing the LTC3542ES6#TRMPBF datasheet, LTC3542ES6#TRMPBF pinout, LTC3542ES6#TRMPBF application, or LTC3542ES6#TRMPBF equivalent, key selection criteria include its 26μA quiescent current in Burst Mode, ±2% output voltage accuracy, internal 0.6V reference, 1MHz–3MHz external synchronization capability, and TSOT-23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC3542ES6#TRMPBF employs a constant-frequency current-mode control architecture with integrated P-channel and N-channel MOSFETs. Its 2.25MHz oscillator enables ceramic capacitor compatibility and compact 2mm × 2mm footprint designs, while MODE/SYNC pin configuration supports either Burst Mode (26μA IQ) or pulse-skipping operation.
It features internal soft-start (1ms ramp), undervoltage lockout (1.8V–2.3V threshold), overtemperature protection (125°C junction limit), and feedback regulation referenced to a precise 0.6V bandgap. The device operates across –40°C to +85°C and supports adjustable output voltages from 0.6V to VIN via external resistor divider.
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 LDO pre-regulation. |
| Output Current | 500mA continuous - sufficient for core logic rails in cellular phones, MP3 players, and PDAs. |
| Switching Frequency | 2.25MHz (internal) - enables use of ≤2.2μH inductors and 10μF ceramic capacitors for minimal board area. |
| Quiescent Current | 26μA in Burst Mode - extends battery runtime during standby/sleep states in portable electronics. |
| Feedback Reference | 0.6V ±2% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V) with standard resistor tolerances. |
| Shutdown Current | <1μA - ensures zero-load battery drain when system is powered off. |
| Peak Switch Current | 1000mA - provides margin for transient load surges and inductor saturation avoidance. |
Pinout & Package
Package: 6-Lead Plastic TSOT-23 (S6), 2.9mm × 1.6mm × 1.0mm body height, exposed pad not present (unlike DFN 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; 0.6V threshold 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 draw. |
| MODE/SYNC (Pin 5) | Mode Selection & Sync | Configures Burst Mode (GND), pulse-skip (VIN), or external clock sync (1MHz–3MHz); no floating allowed. |
| SW (Pin 6) | Switch Node | Connects to inductor; carries high di/dt square wave; requires short, wide trace and tight loop with CIN/COUT. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Switches | Eliminates need for external Schottky diode, reducing BOM count and improving efficiency by ~5% vs asynchronous designs. |
| 100% Duty Cycle Operation | Enables dropout regulation down to VOUT = VIN − (IOUT × RDS(ON)), extending usable battery voltage range by ~300mV. |
| Ceramic Capacitor Optimized | Stable with low-ESR X5R/X7R ceramics; achieves <20mVP-P ripple without ESR-dependent compensation. |
| Internal Soft-Start | 1ms linear reference ramp prevents inrush current spikes during power-up, protecting input source and output caps. |
| Overtemperature Protection | Thermal shutdown at ~160°C junction temperature disables both switches, preventing permanent damage under sustained overload. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V/500mA) from single Li-ion cell during voice/data transmission bursts. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core rail with fast transient response to handle CPU load steps. Use Value: 26μA Burst Mode IQ minimizes standby drain; 2.25MHz switching avoids interference with RF bands; ±2% accuracy ensures reliable digital logic operation. | Use Scenario: Supplying 3.3V I/O rail for Ethernet PHY and USB interface in DSL/cable modem adapters. IC Role / Device Role / Timing Role: High-efficiency intermediate voltage regulator converting battery or wall-adapter input to stable system bus voltage. Use Value: 96% peak efficiency reduces thermal load in enclosed plastic enclosures; 100% duty cycle maintains regulation as adapter voltage sags under load. |
| Digital Cameras | MP3 Players |
Use Scenario: Generating 1.8V sensor bias and 2.8V LCD backlight driver supply in compact camera modules. IC Role / Device Role / Timing Role: Dual-rail power source supporting simultaneous analog sensor and digital display subsystems. Use Value: Small TSOT-23-6 footprint saves space on dense camera PCBs; low output ripple (<20mVP-P) prevents image noise in CMOS sensors. | Use Scenario: Providing 1.2V core voltage to ARM-based audio decoder IC and 3.3V supply to flash memory in portable music players. IC Role / Device Role / Timing Role: Main system power converter managing dynamic load changes during audio decode, screen refresh, and button press events. Use Value: Pulse-skip mode (via MODE/SYNC = VIN) suppresses audible switching noise during quiet playback; 2.5V–5.5V input accommodates full battery discharge curve. |
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 |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed frequency, 400mA output, 17μA IQ in PWM mode; no Burst Mode; different pinout (5-pin WSON). | Better suited for ultra-low-noise applications requiring constant-frequency operation; lacks 100% duty cycle. | Select when strict EMI control is required and load current stays above 50mA; verify layout compatibility due to non-pin-compatible package. |
| MAX1724EZT+T | 2.5MHz, 600mA, 22μA IQ in skip mode; ±1.5% VREF; requires external compensation. | Higher output current and tighter reference accuracy; less integrated (no internal soft-start, no MODE/SYNC flexibility). | Choose for higher-current systems needing improved load regulation; accept added design complexity for external loop compensation. |
Compared with TPS62231DRVR and MAX1724EZT+T, the LTC3542ES6#TRMPBF offers unique Burst Mode operation for lowest light-load IQ, built-in 100% duty cycle for extended battery life, and dual-mode MODE/SYNC flexibility-making it optimal for battery-powered devices with highly variable load profiles.
Availability
LTC3542ES6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital cameras, MP3 players, and PDAs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC3542ES6#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 LTC3542ES6#TRMPBF belongs to Linear's µPower synchronous buck converter family, designed specifically for energy-constrained portable electronics where ultra-low quiescent current, small size, and high efficiency across wide load ranges are essential.
FAQ
What is the maximum output current capability of the LTC3542ES6#TRMPBF?
The LTC3542ES6#TRMPBF 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. Actual deliverable current depends on ambient temperature, PCB copper area, input/output voltage differential, and inductor selection - for example, at VIN = 3.6V and VOUT = 1.8V, full 500mA is achievable with proper thermal design using the TSOT-23-6 package.
Does the LTC3542ES6#TRMPBF require an external Schottky diode?
No, the LTC3542ES6#TRMPBF does not require an external Schottky diode. It integrates both high-side P-channel and low-side N-channel MOSFETs in a synchronous buck topology, eliminating conduction losses and heat generation associated with external diodes. This integration improves efficiency by approximately 5% compared to asynchronous alternatives and simplifies bill-of-materials and layout.
How does the MODE/SYNC pin affect operation of the LTC3542ES6#TRMPBF?
The MODE/SYNC pin on the LTC3542ES6#TRMPBF serves three functions: grounding selects Burst Mode (26μA IQ, higher ripple), connecting to VIN selects pulse-skip mode (lower ripple, reduced light-load efficiency), and applying a 1MHz–3MHz external clock synchronizes switching while auto-selecting pulse-skip. This pin must never be left floating, as undefined states may cause erratic behavior or increased EMI.
What is the purpose of the RUN pin on the LTC3542ES6#TRMPBF?
The RUN pin on the LTC3542ES6#TRMPBF is an active-high enable input that controls device startup and shutdown. Driving RUN ≥1.5V enables regulation; pulling RUN ≤0.3V places the LTC3542ES6#TRMPBF into shutdown mode, reducing supply current to <1μA. During shutdown, all internal circuitry is disabled, SW goes high-impedance, and VFB is disconnected - enabling true zero-power state for battery conservation.
Can the LTC3542ES6#TRMPBF operate with ceramic output capacitors?
Yes, the LTC3542ES6#TRMPBF is explicitly designed to operate stably with low-ESR ceramic output capacitors such as X5R or X7R types. Unlike many older regulators, its current-mode control loop does not rely on capacitor ESR for stability, allowing use of 10μF ceramic capacitors to achieve very low output ripple (<20mVP-P typical) and minimal PCB footprint - a key advantage for space-constrained portable applications.
LTC3542ES6#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3542ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3542ES6#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 LTC3542ES6#TRMPBF reliable?
The price and inventory of LTC3542ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3542ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3542ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3542ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3542ES6#TRMPBF?
LTC3542ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3542ES6#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 LTC3542ES6#TRMPBF?
For technical support, including LTC3542ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3542ES6#TRMPBF requirements.
6.How does Aetrix verify that LTC3542ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3542ES6#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 LTC3542ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3542ES6#TRMPBF?
All LTC3542ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3542ES6#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 LTC3542ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3542ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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