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Analog Devices Inc. LTC3542EDC#TRPBF
- Part No.:
- LTC3542EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3542EDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
LTC3542EDC#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter with constant-frequency current-mode control, 2.25MHz switching, 500mA output capability, 2.5V–5.5V input range, and 0.6V reference for adjustable output down to 0.6V. It delivers up to 96% efficiency in portable Li-Ion battery-powered systems such as MP3 players and PDAs.
For engineers reviewing the LTC3542EDC#TRPBF datasheet, LTC3542EDC#TRPBF pinout, LTC3542EDC#TRPBF application, or LTC3542EDC#TRPBF equivalent, key selection criteria include its 26μA quiescent current in Burst Mode, 100% duty cycle for low-dropout operation, internal power MOSFETs eliminating external Schottky diodes, ±2% output voltage accuracy, and MODE/SYNC pin support for external clock synchronization from 1MHz to 3MHz.
Technical Context
The LTC3542EDC#TRPBF implements a current-mode, constant-frequency buck architecture with integrated P-channel and N-channel MOSFETs. Its control loop uses a 0.6V reference and error amplifier to regulate output voltage via external resistive feedback, while slope compensation ensures stability across duty cycles.
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 ripple, reduced efficiency at light load), and applying an external 1MHz–3MHz clock synchronizes switching while forcing pulse-skip mode. 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 - supports single-cell Li-Ion (2.7V–4.2V) with margin for discharge and regulation. |
| Switching Frequency | 2.25MHz fixed, synchronizable 1MHz–3MHz - enables use of sub-3mm ceramic inductors and compact 10μF input/output caps. |
| Output Current | 500mA continuous - sufficient for core logic rails in handheld devices; peak switch current rated at 1000mA. |
| Quiescent Current | 26μA in Burst Mode - extends battery runtime in standby; drops to <1μA in shutdown. |
| Feedback Reference | 0.6V ±2% - allows precise output setting down to 0.6V using standard resistor dividers. |
| Duty Cycle | 100% - maintains regulation during deep battery discharge (e.g., VIN = VOUT + RDS(ON)·ILOAD). |
| Output Ripple | <20mVP-P typical - achieved with ceramic capacitors and optimized layout; minimized by current-mode control. |
| Thermal Limit | Junction temperature shutdown at ~160°C - protects device under overload or poor PCB thermal design. |
Pinout & Package
The LTC3542EDC#TRPBF is housed in a 6-lead 2mm × 2mm plastic DFN package with exposed pad (Pin 7) that must be soldered to PCB ground for thermal and electrical integrity. Thermal resistance θJA = 102°C/W when properly mounted on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power supply input | Accepts 2.5V–5.5V; requires local 10μF ceramic decoupling to GND. |
| GND (Pin 2) | Ground reference | Primary signal ground; connects to exposed pad (Pin 7) for low-impedance return path. |
| VFB (Pin 3) | Feedback input | Monitors divided output voltage; regulated to 0.6V; high-impedance (±30nA bias). |
| RUN (Pin 4) | Enable control | Active-high: >1.5V enables converter; <0.3V forces shutdown (<1μA IQ). |
| MODE/SYNC (Pin 5) | Mode selection & sync input | Configures Burst Mode (GND), pulse-skip (VIN), or external clock sync (1–3MHz). |
| SW (Pin 6) | Switch node | Connects to inductor; carries high dv/dt switching waveform; requires tight layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode Operation | Reduces quiescent current to 26μA at light loads while maintaining regulation - critical for battery longevity in intermittent-use devices. |
| Internal Synchronous MOSFETs | Eliminates need for external Schottky diode - reduces BOM count, PCB area, and conduction losses. |
| 100% Duty Cycle Capability | Enables dropout operation down to VIN ≈ VOUT - extends usable battery voltage range in Li-Ion systems. |
| Ceramic Capacitor Optimized | Stable with low-ESR X5R/X7R ceramics - achieves <20mVP-P ripple and small footprint without requiring ESR-based compensation. |
| Internal Soft-Start | Linear 0V→0.6V reference ramp over ~1ms - limits inrush current during startup and prevents output overshoot. |
| Overtemperature Protection | Thermal shutdown at ~160°C - safeguards device under sustained overload or inadequate heatsinking. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V–1.8V) from single Li-Ion cell in slim handset form factor. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core rail with fast transient response to bursty CPU loads. Use Value: 96% peak efficiency and 26μA Burst Mode IQ extend talk time; 2.25MHz switching enables 2.2μH inductor and 10μF ceramic caps for minimal board area. | Use Scenario: Supplying 3.3V I/O and RF front-end bias in DSL or LTE modem modules with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency DC/DC converter operating in pulse-skip mode to suppress switching noise near sensitive analog receivers. Use Value: MODE/SYNC pin configurable for low-ripple pulse-skip operation; ±2% output accuracy ensures stable interface signaling across temperature. |
| Digital Cameras | MP3 Players |
Use Scenario: Generating 1.8V sensor bias and 2.8V image processor core supply in compact camera modules with rapid on/off cycling. IC Role / Device Role / Timing Role: Efficient, fast-starting buck converter enabling instant-on functionality via RUN pin control. Use Value: Internal soft-start limits inrush current during wake-up; 100% duty cycle sustains output during battery sag during flash LED activation. | Use Scenario: Regulating audio codec and NAND flash I/O voltage (3.3V) from aging Li-Ion battery in portable media player. IC Role / Device Role / Timing Role: Low-noise, high-efficiency step-down converter supporting variable load profiles (playback vs standby). Use Value: Dual-mode operation (Burst vs pulse-skip) allows trade-off between battery life and audio DAC supply cleanliness; 0.6V reference supports future lower-voltage designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed frequency, 400mA output, 2.05V–6.5V input, 17μA IQ in PWM mode - no Burst Mode; uses external compensation. | Higher switching frequency but lower current rating; less suitable for 500mA sustained loads or ultra-low-IQ battery standby. | Select if 3MHz operation and smaller inductor size are prioritized over light-load efficiency and 500mA capability. |
| MAX17222ETA+ | 2.5MHz, 500mA, 2.0V–5.5V input, 2.5μA IQ in shutdown - includes true 100% duty cycle and integrated soft-start, but lacks external sync capability. | No MODE/SYNC pin for clock synchronization or mode selection; limited to fixed Burst/PWM configuration. | Choose when minimal IQ in shutdown is critical and external clock sync is unnecessary; verify thermal performance at 500mA in DFN package. |
Compared with TPS62231DRVR and MAX17222ETA+, the LTC3542EDC#TRPBF uniquely combines 500mA output, 26μA Burst Mode IQ, 100% duty cycle, and 1–3MHz external synchronization - making it optimal for space-constrained, battery-sensitive applications requiring flexible noise/efficiency trade-offs.
Availability
LTC3542EDC#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital cameras, MP3 players, and PDAs requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LTC3542EDC#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3542EDC#TRPBF belongs to Linear's high-efficiency, high-frequency monolithic DC/DC converter family, designed specifically for portable Li-Ion-powered applications demanding ultra-low quiescent current, small solution size, and robust transient response.
FAQ
What is the maximum output current capability of the LTC3542EDC#TRPBF?
The LTC3542EDC#TRPBF is rated for 500mA continuous output current. Its internal P-channel and N-channel MOSFETs support a peak switch current of 1000mA, enabling robust handling of short-duration load transients. Derating is recommended above 85°C ambient or in high-duty-cycle dropout conditions due to RDS(ON) increase with temperature and input voltage.
How does the MODE/SYNC pin affect LTC3542EDC#TRPBF operation?
The MODE/SYNC pin on the LTC3542EDC#TRPBF 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 mode. This pin must never be left floating.
Can the LTC3542EDC#TRPBF operate with ceramic output capacitors?
Yes, the LTC3542EDC#TRPBF is explicitly designed for stable operation with low-ESR ceramic output capacitors such as X5R or X7R types. Its current-mode control architecture does not rely on capacitor ESR for loop stability, enabling <20mVP-P output ripple and compact 10μF solutions - unlike many older buck controllers requiring tantalum or aluminum electrolytics.
What is the purpose of the exposed pad on the LTC3542EDC#TRPBF DFN package?
Pin 7 of the LTC3542EDC#TRPBF is an exposed thermal pad electrically connected to GND. It must be soldered to a PCB copper pour for both electrical grounding and thermal dissipation. Without this connection, θJA degrades significantly (from 102°C/W to >200°C/W), risking thermal shutdown or reliability failure under 500mA load.
Does the LTC3542EDC#TRPBF support 100% duty cycle operation, and why is it important?
Yes, the LTC3542EDC#TRPBF supports 100% duty cycle operation, allowing the P-channel main switch to remain continuously on when VIN approaches VOUT. This low-dropout capability extends usable battery life in single-cell Li-Ion systems by maintaining regulation down to ~2.7V input - critical for maximizing runtime before system brownout.
LTC3542EDC#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3542EDC#TRPBF FAQ
1.How can I place an order for LTC3542EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3542EDC#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 LTC3542EDC#TRPBF reliable?
The price and inventory of LTC3542EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3542EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3542EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3542EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3542EDC#TRPBF?
LTC3542EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3542EDC#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 LTC3542EDC#TRPBF?
For technical support, including LTC3542EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3542EDC#TRPBF requirements.
6.How does Aetrix verify that LTC3542EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3542EDC#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 LTC3542EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3542EDC#TRPBF?
All LTC3542EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3542EDC#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 LTC3542EDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3542EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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