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Analog Devices Inc. LTC3542EDC#TRMPBF
- Part No.:
- LTC3542EDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3542EDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:960
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Product details
Overview
LTC3542EDC#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter with constant-frequency current-mode control, delivering up to 500mA output current at 2.25MHz switching frequency. It operates from 2.5V to 5.5V input, supports adjustable output from 0.6V to VIN, and achieves up to 96% efficiency in portable Li-Ion battery-powered systems.
For engineers reviewing the LTC3542EDC#TRMPBF datasheet, LTC3542EDC#TRMPBF pinout, LTC3542EDC#TRMPBF application, or LTC3542EDC#TRMPBF equivalent, key selection criteria include its 26μA quiescent current in Burst Mode, 100% duty cycle for low-dropout operation, ±2% output voltage accuracy, internal power switches eliminating external Schottky diodes, and compatibility with ceramic output capacitors for minimal ripple and footprint.
Technical Context
The LTC3542EDC#TRMPBF implements a current-mode control loop with a fixed 2.25MHz oscillator, enabling fast transient response and stable regulation across line and load variations. Its dual-MOSFET synchronous architecture integrates a P-channel high-side switch (RDS(ON) = 0.5Ω typ) and N-channel low-side switch (RDS(ON) = 0.35Ω typ), both optimized for high efficiency without external diode requirements.
Operation modes are selected via the MODE/SYNC pin: grounding enables Burst Mode (26μA IQ), tying to VIN enables pulse-skip mode (low-noise), and applying 1MHz–3MHz external clock synchronizes switching while forcing pulse-skip. The device includes internal soft-start (1ms ramp), undervoltage lockout (~2V), overtemperature protection, and shutdown current <1μA.
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. |
| Output Current | 500mA continuous - sufficient for core logic rails in handheld devices without thermal derating at 85°C ambient. |
| Switching Frequency | 2.25MHz (internal) - enables use of compact 2.2μH inductors and 10μF ceramic capacitors for minimal PCB area. |
| Feedback Reference | 0.6V ±2% - allows precise output programming down to 0.6V with standard resistor dividers. |
| Quiescent Current | 26μA in Burst Mode - extends battery runtime in standby or low-power sleep states. |
| Shutdown Current | <1μA - ensures negligible drain during system off-state, critical for always-on sensors or RTCs. |
| Peak Switch Current | 1000mA - provides headroom for startup surges and transient loads without current-limit foldback. |
| Output Ripple | <20mVP-P typical - achieved with ceramic output capacitors, suitable for noise-sensitive analog/RF circuitry. |
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 (θJA = 102°C/W on 4-layer board).
| 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 AC impedance. |
| GND (Pin 2) | Ground Reference | Analog and power ground return; must be connected to PCB ground plane with low-inductance path. |
| VFB (Pin 3) | Feedback Input | Monitors divided output voltage; 0.6V reference sets regulation point; high-impedance (±30nA) minimizes divider error. |
| RUN (Pin 4) | Enable Control | Active-high enable: >1.5V enables regulator, <0.3V forces shutdown (<1μA IQ); must not float. |
| MODE/SYNC (Pin 5) | Mode Selection & Sync Input | Configures Burst Mode (GND), pulse-skip (VIN), or external sync (1–3MHz); also serves as sync input during synchronization. |
| SW (Pin 6) | Switch Node | Connects to inductor; carries high di/dt square wave; requires short, wide trace to reduce EMI and voltage spikes. |
| Exposed Pad (Pin 7) | Thermal & Electrical Ground | Must be soldered to PCB ground plane; failure to do so degrades thermal performance and may cause overheating. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated P- and N-channel MOSFETs eliminate external Schottky diode, reducing BOM count and improving efficiency by ~5% vs asynchronous designs. |
| Burst Mode Operation | Reduces quiescent current to 26μA at light loads while maintaining regulation, extending battery life in intermittent-use applications like remote controls. |
| 100% Duty Cycle Capability | Enables dropout operation when VIN ≈ VOUT, sustaining output voltage down to ~2.7V input for 1.8V rail - critical for deep battery discharge. |
| Ceramic Capacitor Optimized | Stable with low-ESR ceramic output caps (e.g., 10μF X5R), achieving <20mVP-P ripple and eliminating need for bulk tantalum or electrolytic capacitors. |
| Internal Soft-Start | 1ms linear reference ramp limits inrush current during power-up, preventing input voltage sag and avoiding false UVLO triggering. |
| External Frequency Synchronization | Accepts 1MHz–3MHz clock on MODE/SYNC pin to eliminate beat frequencies in multi-rail systems and reduce EMI in sensitive RF layouts. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V/1.8V) from single Li-Ion cell in 3G/4G handsets. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise supply with fast load transient response. Use Value: 96% peak efficiency and 26μA Burst Mode IQ directly extend talk time and standby duration without compromising RF performance. |
Use Scenario: Generating 3.3V I/O rail for LTE/Wi-Fi module in compact USB dongles or embedded gateways. IC Role / Device Role / Timing Role: High-frequency step-down converter enabling miniaturized power stage with minimal inductor/capacitor footprint. Use Value: 2.25MHz operation allows 2.2μH inductor and 10μF ceramic caps, reducing solution size by >40% vs 500kHz alternatives. |
| Digital Cameras | MP3 Players |
Use Scenario: Supplying image sensor analog bias (2.8V) and digital core (1.2V) in ultra-thin point-and-shoot cameras. IC Role / Device Role / Timing Role: Dual-rail capable buck converter (via external feedback resistors) delivering clean, low-ripple power for noise-sensitive imaging circuits. Use Value: <20mVP-P output ripple prevents visible banding in captured images; ceramic capacitor compatibility avoids tantalum reliability concerns. |
Use Scenario: Regulating 1.8V DSP core and 3.3V audio codec supply in portable music players with 8–16 hour battery life. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current DC/DC converter managing dynamic load changes during playback, pause, and Bluetooth streaming. Use Value: Pulse-skip mode (selected via MODE/SYNC tied to VIN) suppresses audible switching noise in headphone outputs while maintaining >90% efficiency at mid-load. |
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 | 2.25MHz fixed frequency, 300mA output, 17μA IQ in PWM mode; no Burst Mode; smaller 2mm × 2mm WSON package. | Lower output current rating limits use to sub-300mA rails; lacks 100% duty cycle for true dropout. | Select when lower IQ in forced-PWM is prioritized over burst efficiency and full dropout capability. |
| MAX17503GTA+ | Adjustable 200kHz–2.2MHz frequency, 600mA output, 100% duty cycle, but 250μA IQ in skip mode and larger 3mm × 3mm TDFN. | Higher IQ reduces battery life in always-on functions; wider frequency range aids EMI tuning but adds complexity. | Select when higher output current and flexible frequency synchronization outweigh quiescent current penalties. |
Compared with TPS62231DRVR and MAX17503GTA+, the LTC3542EDC#TRMPBF uniquely balances ultra-low 26μA Burst Mode IQ, guaranteed 100% duty cycle, and ceramic-capacitor stability in a compact DFN - making it optimal for space-constrained, battery-critical Li-Ion applications where efficiency at light loads is non-negotiable.
Availability
LTC3542EDC#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital cameras, MP3 players, and PDAs requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3542EDC#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 maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3542EDC#TRMPBF belongs to Linear's precision monolithic DC/DC converter product line, designed specifically for portable, battery-powered applications demanding high efficiency at light loads, minimal PCB area, and robust operation across temperature extremes.
FAQ
What is the operating temperature range for the LTC3542EDC#TRMPBF?
The LTC3542EDC#TRMPBF is specified for –40°C to +85°C ambient operation (E-grade). Its junction temperature limit is 125°C, and thermal resistance θJA is 102°C/W when the exposed pad is properly soldered to a 4-layer PCB ground plane. This rating ensures reliable performance in handheld consumer electronics under typical usage conditions.
Does the LTC3542EDC#TRMPBF require an external Schottky diode?
No, the LTC3542EDC#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 configuration, eliminating conduction losses and heat generation associated with external diodes - a key factor in achieving up to 96% efficiency.
How is output voltage programmed on the LTC3542EDC#TRMPBF?
The LTC3542EDC#TRMPBF uses a resistive divider from VOUT to GND, feeding the VFB pin. With a 0.6V internal reference, VOUT = 0.6V × (1 + R1/R2). For example, R1 = 18kΩ and R2 = 12kΩ yields 1.5V output. A feed-forward capacitor (CF) across R1 improves transient response and is recommended for loads >100mA.
Can the LTC3542EDC#TRMPBF synchronize to an external clock?
Yes, the LTC3542EDC#TRMPBF can synchronize to an external clock applied to the MODE/SYNC pin across a 1MHz to 3MHz range. During synchronization, the device automatically enters pulse-skip mode and aligns its top-switch turn-on edge to the falling edge of the external clock signal - essential for noise-sensitive multi-rail systems.
What is the purpose of the exposed pad on the LTC3542EDC#TRMPBF DFN package?
The exposed pad (Pin 7) on the LTC3542EDC#TRMPBF DFN package is electrically and thermally connected to GND. It must be soldered to the PCB ground plane to achieve the specified θJA = 102°C/W and prevent thermal runaway. Failure to solder this pad results in significantly higher junction temperatures and potential device shutdown under load.
LTC3542EDC#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3542EDC#TRMPBF FAQ
1.How can I place an order for LTC3542EDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3542EDC#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 LTC3542EDC#TRMPBF reliable?
The price and inventory of LTC3542EDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3542EDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3542EDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3542EDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3542EDC#TRMPBF?
LTC3542EDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3542EDC#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 LTC3542EDC#TRMPBF?
For technical support, including LTC3542EDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3542EDC#TRMPBF requirements.
6.How does Aetrix verify that LTC3542EDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3542EDC#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 LTC3542EDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3542EDC#TRMPBF?
All LTC3542EDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3542EDC#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 LTC3542EDC#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3542EDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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