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Analog Devices Inc. LTC3542IDC#TRPBF
- Part No.:
- LTC3542IDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3542IDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,400
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Product details
Overview
LTC3542IDC#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 from 2.5V to 5.5V input, features 2.25MHz fixed-frequency current-mode control, and achieves up to 96% efficiency in burst mode. Its 100% duty cycle enables low-dropout operation critical for battery life extension in handheld devices.
For engineers reviewing the LTC3542IDC#TRPBF datasheet, LTC3542IDC#TRPBF pinout, LTC3542IDC#TRPBF application, or LTC3542IDC#TRPBF equivalent, key selection considerations include its 6-lead 2mm × 2mm DFN package, ±2% output voltage accuracy, 0.6V feedback reference, <1μA shutdown current, and MODE/SYNC pin programmability for Burst Mode® or pulse-skip operation across 1MHz–3MHz synchronization range.
Technical Context
The LTC3542IDC#TRPBF implements a constant-frequency, current-mode buck architecture with internal P-channel and N-channel MOSFETs. Its control loop uses a 0.6V precision reference and error amplifier to regulate output voltage via external resistive divider, while slope compensation ensures stability under varying duty cycles.
It supports three operational modes via the MODE/SYNC pin: GND-tied for Burst Mode® (26μA quiescent), VIN-tied for pulse-skip (low-noise), or external clock injection (1–3MHz) for EMI-sensitive designs. The RUN pin provides enable/disable control with 0.3V/1.5V thresholds, and thermal shutdown activates at TJ ≈ 160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports full discharge curve of single Li-Ion cell without brownout. |
| Output Current | 500mA max continuous - sufficient for core logic and RF sections in cellular handsets and modems. |
| Switching Frequency | 2.25MHz fixed, syncable 1–3MHz - enables use of 2.2μH inductors and 10μF ceramic caps for compact PCB layout. |
| Feedback Reference | 0.6V ±2% - allows adjustable output down to 0.6V, supporting modern low-voltage SoCs and FPGAs. |
| Quiescent Current | 26μA in Burst Mode®, <1μA in shutdown - extends battery runtime in standby and sleep states. |
| Efficiency | Up to 96% at 500mA - minimizes thermal load and power loss in space-constrained portable enclosures. |
| Duty Cycle | 100% - maintains regulation as input drops to VOUT + RDS(ON)·IOUT, critical for end-of-battery-life operation. |
Pinout & Package
Package: 6-lead 2mm × 2mm plastic DFN with exposed pad (Pin 7 = GND). Requires soldering of exposed pad for thermal and electrical integrity per θJA = 102°C/W specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Accepts 2.5V–5.5V supply; must be decoupled with ≥10μF ceramic capacitor near pin. |
| GND (Pin 2) | Ground Reference | Analog and power ground return; connects to exposed pad (Pin 7) for low-impedance path. |
| VFB (Pin 3) | Feedback Input | Monitors resistor-divider output; 0.6V threshold sets regulated VOUT = 0.6V·(1+R1/R2). |
| RUN (Pin 4) | Enable Control | Active-high logic: >1.5V enables converter; <0.3V forces shutdown (<1μA IQ). |
| MODE/SYNC (Pin 5) | Mode Selection & Clock Sync | Selects Burst Mode® (GND), pulse-skip (VIN), or external sync (1–3MHz square wave). |
| SW (Pin 6) | Switch Node | Connects to inductor; carries high di/dt switching current; requires short, low-inductance routing. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode required | Integrated synchronous rectification eliminates conduction loss and board area for discrete diode. |
| Internal soft-start | 1ms linear ramp of 0.6V reference prevents inrush current and output overshoot at startup. |
| Overtemperature protection | Thermal shutdown disables both switches when junction exceeds ~160°C, preventing permanent damage. |
| Ceramic capacitor optimized | Stable with low-ESR X5R/X7R ceramics; no ESR dependency for loop compensation reduces output ripple to <20mVP-P. |
| Undervoltage lockout (UVLO) | Activates at ~2.0V falling VIN to prevent erratic operation during battery depletion. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-Ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.8V/500mA with Burst Mode® for standby efficiency. Use Value: Extends talk time by maintaining >90% efficiency down to 1mA load and enabling 100% duty cycle near end-of-discharge. | Use Scenario: Supplying 3.3V logic and 1.2V core for DSL/wireless modem SoC in compact enclosure. IC Role / Device Role / Timing Role: Synchronous step-down converter with MODE/SYNC pin configured for pulse-skip to minimize conducted EMI. Use Value: Achieves <20mVP-P output ripple without LC filtering, reducing BOM count and PCB footprint vs. asynchronous alternatives. |
| Digital Cameras | MP3 Players |
Use Scenario: Providing 2.5V for image sensor and 1.2V for DSP core during burst capture mode. IC Role / Device Role / Timing Role: Dual-output capable via resistor programming; fast transient response handles rapid load steps from sensor activation. Use Value: Load-step recovery within 20μs (per G05/G06 curves) prevents image corruption or frame drop during exposure. | Use Scenario: Regulating audio codec and flash memory supply in battery-powered portable audio device. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in Burst Mode® during music playback pause. Use Value: Draws only 26μA quiescent current during idle, contributing to >20-hour battery life on 500mAh cell. |
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 |
|---|---|---|---|
| TPS62231DRYR | 2.25MHz fixed frequency, 300mA output, 2.05V–6.5V input, 18μA IQ in PWM mode | Lower output current rating; lacks 100% duty cycle and Burst Mode® | Preferred for cost-sensitive, lower-current applications where 500mA headroom is unnecessary. |
| MAX8640YETA+ | 3MHz fixed frequency, 600mA output, 2.6V–5.5V input, 25μA IQ in skip mode | Higher switching frequency enables smaller inductors but has tighter input voltage minimum | Suitable when board space is constrained and 3MHz operation aligns with system EMI requirements. |
Compared with TPS62231DRYR and MAX8640YETA+, the LTC3542IDC#TRPBF offers superior low-load efficiency via Burst Mode®, guaranteed 500mA output across –40°C to 125°C, and robust 100% duty cycle for Li-Ion end-of-life support - making it optimal for thermally demanding portable designs requiring long battery life and wide temperature operation.
Availability
LTC3542IDC#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital cameras, and MP3 players requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3542IDC#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 LTC3542IDC#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter product line, designed specifically for space- and battery-constrained portable electronics requiring ultra-low quiescent current and ceramic-capacitor compatibility.
FAQ
What is the maximum output current capability of the LTC3542IDC#TRPBF?
The LTC3542IDC#TRPBF is rated for up to 500mA continuous output current under typical conditions (VIN = 3.6V, VOUT = 1.8V, TA = 25°C). Peak switch current reaches 1000mA, but sustained operation above 500mA may exceed thermal limits depending on PCB layout and ambient temperature. Derating is required above 85°C ambient per the device's thermal resistance (θJA = 102°C/W for DFN package).
Does the LTC3542IDC#TRPBF require an external Schottky diode?
No, the LTC3542IDC#TRPBF does not require an external Schottky diode. It integrates both high-side P-channel and low-side N-channel MOSFETs for synchronous rectification, eliminating conduction losses and board space associated with discrete diodes. This design directly enables high efficiency (>90% at light loads) and simplifies bill-of-materials.
How is output voltage programmed on the LTC3542IDC#TRPBF?
Output voltage on the LTC3542IDC#TRPBF is set using an external resistive divider connected between VOUT, VFB, and GND. The formula is VOUT = 0.6V × (1 + R1/R2), where R1 connects from VOUT to VFB and R2 connects from VFB to GND. A feed-forward capacitor (CF) may be added across R1 to improve transient response, and VFB trace routing must avoid noise sources like SW or inductor.
What are the operating temperature limits for the LTC3542IDC#TRPBF?
The LTC3542IDC#TRPBF is specified for operation from –40°C to +125°C junction temperature. As an Industrial-grade part (denoted by 'I' in the part number), it is guaranteed over the full –40°C to +125°C ambient temperature range. Absolute maximum junction temperature is 125°C, with thermal shutdown engaging near 160°C to protect the device.
Can the LTC3542IDC#TRPBF synchronize to an external clock signal?
Yes, the LTC3542IDC#TRPBF can synchronize to an external clock signal applied to the MODE/SYNC pin. It accepts square-wave inputs from 1MHz to 3MHz, automatically entering pulse-skip mode during synchronization. The external clock's falling edge triggers top-switch turn-on, enabling deterministic timing for EMI reduction and multi-rail phase alignment in complex power systems.
LTC3542IDC#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:
- 500mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3542IDC#TRPBF FAQ
1.How can I place an order for LTC3542IDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3542IDC#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 LTC3542IDC#TRPBF reliable?
The price and inventory of LTC3542IDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3542IDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3542IDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3542IDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3542IDC#TRPBF?
LTC3542IDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3542IDC#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 LTC3542IDC#TRPBF?
For technical support, including LTC3542IDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3542IDC#TRPBF requirements.
6.How does Aetrix verify that LTC3542IDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3542IDC#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 LTC3542IDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3542IDC#TRPBF?
All LTC3542IDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3542IDC#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 LTC3542IDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3542IDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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