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Analog Devices Inc. LTC3542IDC#TRMPBF
- Part No.:
- LTC3542IDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3542IDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:947
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Product details
Overview
LTC3542IDC#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 enables low-dropout operation critical for battery life extension in handheld devices.
For engineers reviewing the LTC3542IDC#TRMPBF datasheet, LTC3542IDC#TRMPBF pinout, LTC3542IDC#TRMPBF application, or LTC3542IDC#TRMPBF equivalent, key selection considerations include quiescent current (26μA in Burst Mode), ±2% output voltage accuracy, internal soft-start, overtemperature protection, and compatibility with ceramic output capacitors for minimal PCB footprint.
Technical Context
The LTC3542IDC#TRMPBF employs a constant-frequency current-mode control architecture with an integrated P-channel high-side and N-channel low-side MOSFET pair. Its 2.25MHz oscillator supports external synchronization from 1MHz to 3MHz via the MODE/SYNC pin, enabling EMI reduction in noise-sensitive systems.
Operation includes selectable low-load modes: Burst Mode® (26μA IQ, higher ripple) and pulse-skip mode (lower ripple, reduced efficiency). The 0.6V feedback reference allows output voltages as low as 0.6V, and undervoltage lockout triggers at ~2.0V falling VIN to prevent unstable regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-Ion (fully charged to depleted) without external LDO pre-regulation. |
| Output Current | 500mA max continuous - sufficient for baseband processors, RF transceivers, and display drivers in portable electronics. |
| Switching Frequency | 2.25MHz (internal) - enables use of compact 2.2μH inductors and 10μF ceramic capacitors, minimizing solution size. |
| Quiescent Current | 26μA in Burst Mode - extends battery runtime during standby or light-load states in always-on subsystems. |
| Feedback Reference | 0.6V ±2% - permits precise, low-voltage outputs (e.g., 1.2V, 1.8V) using standard resistor dividers; stable over temperature. |
| Duty Cycle | 100% - maintains regulation down to VOUT + RDS(ON) × ILOAD, essential for maintaining system operation near battery end-of-discharge. |
| Thermal Shutdown | 125°C junction - protects device under sustained overload or poor PCB thermal design; auto-recovery on cooldown. |
Pinout & Package
Package: 6-lead 2mm × 2mm DFN (exposed pad). Requires soldering of exposed pad (Pin 7, GND) to PCB thermal plane for θJA = 102°C/W and reliable power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Supplies internal circuitry and high-side switch; requires local 10μF ceramic decoupling to minimize input ripple and EMI. |
| GND (Pin 2) | Ground Reference | Analog and power ground return; connects to exposed pad (Pin 7) - must be low-impedance path for stability and thermal performance. |
| VFB (Pin 3) | Feedback Input | Monitors resistive divider output; 0.6V threshold sets VOUT = 0.6V × (1 + R1/R2); high-impedance node sensitive to noise coupling. |
| RUN (Pin 4) | Enable Control | Active-high logic input; >1.5V enables regulation, <0.3V forces shutdown (<1μA IQ); must not be left floating. |
| MODE/SYNC (Pin 5) | Mode Selection / Clock Sync | Configures Burst Mode (GND), pulse-skip (VIN), or external sync (1–3MHz square wave); no pull-up/down required. |
| SW (Pin 6) | Switch Node | Connects to inductor; carries high di/dt switching current - requires short, wide trace and tight loop with CIN/COUT to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode required | Integrated synchronous rectification eliminates conduction loss and thermal overhead of discrete diode. |
| Internal soft-start | 1ms linear ramp of 0.6V reference prevents inrush current into output capacitors during power-up. |
| Ceramic capacitor compatible | Stable with low-ESR ceramic output caps - achieves <20mVP-P ripple and reduces board area vs. tantalum solutions. |
| Low dropout operation | 100% duty cycle maintains regulation when VIN approaches VOUT - critical for maximizing usable battery capacity. |
| Overtemperature protection | Thermal shutdown disables both switches at TJ ≥ 125°C; prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF front-end from single Li-Ion cell across full discharge curve (4.2V → 2.7V). IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/500mA to application processor core with dynamic voltage scaling support. Use Value: 100% duty cycle sustains regulation down to 2.7V input, extending talk time by ~12% versus non-dropout converters. | Use Scenario: Supplying 3.3V to Wi-Fi/Bluetooth SoC and 1.8V to memory interface in compact DSL/wireless modem. IC Role / Device Role / Timing Role: Dual-rail power source with fast load transient response to handle burst data transmission peaks. Use Value: Current-mode control delivers <5% output deviation during 100mA–500mA load steps, preventing communication errors. |
| Digital Cameras | MP3 Players |
Use Scenario: Powering image sensor, ISP, and flash LED driver in ultra-thin camera modules with strict height constraints. IC Role / Device Role / Timing Role: High-frequency (2.25MHz) buck converter enabling 2.2μH inductor and 10μF ceramic caps for minimal profile. Use Value: Small 2mm × 2mm DFN package and low-profile passive components reduce total solution height to <1.2mm. | Use Scenario: Regulating audio DAC, headphone amplifier, and NAND flash controller from shared Li-Ion supply. IC Role / Device Role / Timing Role: Low-noise power source operating in pulse-skip mode during playback to suppress audible switching artifacts. Use Value: Pulse-skip mode reduces output ripple to <10mVP-P at 10mA load, eliminating buzz in analog audio paths. |
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, 17μA IQ in PWM mode | Lower current rating; lacks Burst Mode - less suitable for deep sleep states in battery-critical designs | Choose for cost-sensitive, lower-current applications where 300mA suffices and ultra-low IQ is secondary. |
| MAX17503GCU+T | Adjustable 200kHz–2.2MHz sync, 600mA, 4.5V–36V input, 100μA IQ | Wider input range and higher current, but significantly higher quiescent current and larger package (16-pin QFN) | Choose only if input exceeds 5.5V or output current >500mA is required; not drop-in due to pinout and bias requirements. |
Compared with TPS62231DRYR and MAX17503GCU+T, the LTC3542IDC#TRMPBF offers superior light-load efficiency (26μA vs. 17–100μA), true 100% duty cycle for Li-Ion dropout, and smallest footprint - making it optimal for space-constrained, battery-life-critical portable systems.
Availability
LTC3542IDC#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital cameras, and MP3 players requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3542IDC#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 acquired Linear Technology in 2017 and continues its legacy of high-performance power management ICs with precision analog integration.
The LTC3542IDC#TRMPBF belongs to Linear's high-efficiency, high-frequency synchronous buck converter product line, designed specifically for portable Li-Ion-powered applications demanding minimal size, ultra-low quiescent current, and robust transient response.
FAQ
What is the maximum output current capability of the LTC3542IDC#TRMPBF?
The LTC3542IDC#TRMPBF is rated for 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 requires careful thermal design and derating per the junction temperature limits specified in the datasheet. The LTC3542IDC#TRMPBF datasheet confirms this rating across the –40°C to 125°C operating temperature range.
Does the LTC3542IDC#TRMPBF require an external Schottky diode?
No, the LTC3542IDC#TRMPBF 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 thermal overhead associated with external diodes. This integration is explicitly stated in the LTC3542IDC#TRMPBF product description and confirmed in the "No Schottky Diode Required" feature list.
How does the MODE/SYNC pin configure Burst Mode® versus pulse-skip operation on the LTC3542IDC#TRMPBF?
On the LTC3542IDC#TRMPBF, tying the MODE/SYNC pin to GND selects Burst Mode® (26μA IQ, higher output ripple), while connecting it to VIN selects pulse-skip mode (lower ripple, reduced light-load efficiency). The pin also accepts 1MHz–3MHz external clock signals for synchronization, automatically enabling pulse-skip mode during sync. These configurations are defined in the LTC3542IDC#TRMPBF pin functions table and operational descriptions.
What is the purpose of the exposed pad (Pin 7) on the LTC3542IDC#TRMPBF DFN package?
The exposed pad (Pin 7) on the LTC3542IDC#TRMPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJA = 102°C/W and ensure reliable thermal performance under load. Failure to solder the pad results in significantly higher thermal resistance and potential thermal shutdown. This requirement is documented in the LTC3542IDC#TRMPBF package drawing and thermal characteristics section.
Can the LTC3542IDC#TRMPBF operate with ceramic output capacitors?
Yes, the LTC3542IDC#TRMPBF is specifically designed to operate stably with ceramic output capacitors. Its current-mode control architecture does not rely on output capacitor ESR for loop stability, enabling very low output ripple (<20mVP-P typical) and compact designs using 10μF X5R/X7R ceramics. This capability is highlighted in the LTC3542IDC#TRMPBF features and applications information sections.
LTC3542IDC#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3542IDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3542IDC#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 LTC3542IDC#TRMPBF reliable?
The price and inventory of LTC3542IDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3542IDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3542IDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3542IDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3542IDC#TRMPBF?
LTC3542IDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3542IDC#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 LTC3542IDC#TRMPBF?
For technical support, including LTC3542IDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3542IDC#TRMPBF requirements.
6.How does Aetrix verify that LTC3542IDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3542IDC#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 LTC3542IDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3542IDC#TRMPBF?
All LTC3542IDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3542IDC#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 LTC3542IDC#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3542IDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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