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Analog Devices Inc. LTC3542IS6#TRMPBF
- Part No.:
- LTC3542IS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3542IS6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,246
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Product details
Overview
LTC3542IS6#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, operates from 2.5V to 5.5V input, features 2.25MHz fixed-frequency current-mode control, and achieves up to 96% efficiency with ceramic output capacitors in TSOT-23-6 packaging.
For engineers reviewing the LTC3542IS6#TRMPBF datasheet, LTC3542IS6#TRMPBF pinout, LTC3542IS6#TRMPBF application, or LTC3542IS6#TRMPBF equivalent, key selection criteria include its 26μA quiescent current in Burst Mode, ±2% output voltage accuracy, 100% duty cycle low-dropout capability, internal power switches eliminating external Schottky diodes, and MODE/SYNC pin support for external clock synchronization from 1MHz to 3MHz.
Technical Context
The LTC3542IS6#TRMPBF implements a constant-frequency, current-mode buck architecture with an internal 2.25MHz oscillator and selectable operation modes via the MODE/SYNC pin - enabling either Burst Mode (26μA IQ) or pulse-skip mode for noise-sensitive applications. Its control loop uses a 0.6V reference and error amplifier to regulate output voltage across a wide load range.
It integrates P-channel and N-channel MOSFETs with typical RDS(ON) of 0.55Ω (P-ch) and 0.45Ω (N-ch), supports 100% duty cycle for ultra-low dropout, and includes undervoltage lockout (1.9V typical), thermal shutdown, and internal soft-start (1ms ramp). The RUN pin enables/disables the converter with <1μA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-Ion (2.7–4.2V) and regulated 3.3V/5V rails. |
| Output Current | 500mA continuous - sufficient for core logic, RF transceivers, and digital baseband in handheld devices. |
| Switching Frequency | 2.25MHz fixed, synchronizable 1–3MHz - enables use of compact 2.2μH inductors and 10μF ceramic capacitors. |
| Quiescent Current | 26μA in Burst Mode - extends battery runtime during standby or light-load operation. |
| Feedback Reference | 0.6V ±2% - allows precise output programming down to 0.6V using external resistor divider. |
| Efficiency | Up to 96% at 500mA - minimizes thermal stress and power loss in space-constrained PCB layouts. |
| Duty Cycle | 100% - maintains regulation even when input drops near output voltage (e.g., 1.8V out at 2.0V in). |
Pinout & Package
Package: 6-Lead Plastic TSOT-23 (S6), 0.95mm height, RoHS-compliant, lead-free finish. Exposed pad not present (unlike DFN variant); thermal performance defined by θJA = 215°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Accepts 2.5–5.5V supply; requires local 10μF ceramic decoupling to GND for stable switching. |
| GND (Pin 2) | Ground Reference | Primary return path for power and signal currents; must be low-impedance connection to system ground plane. |
| VFB (Pin 3) | Feedback Input | Monitors resistive divider output; regulates VOUT to 0.6V reference; high-impedance (±30nA bias). |
| RUN (Pin 4) | Enable Control | Active-high enable: >1.5V enables converter; <0.3V forces shutdown (<1μA IQ). |
| MODE/SYNC (Pin 5) | Mode Selection & Clock Sync | Configures 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 |
|---|---|
| Burst Mode Operation | Reduces quiescent current to 26μA while maintaining regulation - critical for battery longevity in idle states. |
| No External Schottky Diode Required | Integrated synchronous rectification eliminates conduction loss and board area for discrete diode. |
| Ceramic Capacitor Optimized | Stable with low-ESR ceramic output caps (e.g., 10μF X5R/X7R) - enables <20mVP-P ripple and minimal footprint. |
| Internal Soft-Start | 1ms linear reference ramp prevents inrush current - protects input source and avoids output overshoot during power-up. |
| Overtemperature Protection | Thermal shutdown activates at ~160°C junction temperature - prevents permanent damage under overload or poor heatsinking. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-Ion cell in slim smartphone form factor. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.8V core and I/O supplies with tight transient response. Use Value: 96% peak efficiency and 26μA Burst Mode IQ extend talk time and standby duration without compromising RF noise performance. | Use Scenario: Supplying 3.3V logic and 1.8V PHY in LTE/5G USB dongles or embedded M.2 modules. IC Role / Device Role / Timing Role: High-frequency buck converter synchronized to system clock to avoid interference with cellular bands. Use Value: 2.25MHz switching and MODE/SYNC pin allow deterministic frequency placement outside sensitive receive windows. |
| Digital Cameras | Handheld PDAs |
Use Scenario: Providing clean, low-noise 1.2V core voltage for image sensor ISP and 2.8V for flash LED driver in compact camera modules. IC Role / Device Role / Timing Role: Dual-mode regulator configured in pulse-skip mode during image capture to suppress switching noise on analog sensor lines. Use Value: <20mVP-P output ripple and ceramic-capacitor compatibility ensure minimal image sensor noise and artifact-free video. | Use Scenario: Powering ARM Cortex-A/M series SoC, touchscreen controller, and SD card interface in legacy PDA or industrial handheld. IC Role / Device Role / Timing Role: Main system PMIC buck stage supporting dynamic voltage scaling and deep-sleep state transitions. Use Value: 100% duty cycle operation sustains 1.8V output down to 2.0V input - maximizes usable battery capacity before brownout. |
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 | 3MHz fixed frequency, 400mA output, 17μA IQ in PWM mode only; no Burst Mode; different pinout (5-pin DSBGA). | Higher frequency but lower current rating; lacks true ultralow-IQ mode for long standby. | Prefer for noise-critical 3MHz designs where 400mA suffices and footprint allows BGA rework. |
| MAX17503GTA+ | Adjustable 200kHz–2.2MHz, 1.2A output, 12μA shutdown IQ; requires external compensation; larger 16-pin TQFN package. | Higher current and wider frequency range, but more complex layout and design effort. | Prefer when >500mA load or programmable frequency/slew rate is required in industrial-grade designs. |
Compared with TPS62231DRYR and MAX17503GTA+, the LTC3542IS6#TRMPBF offers superior integration (no external compensation), best-in-class 26μA Burst Mode IQ for Li-Ion systems, and TSOT-23-6 compatibility with existing small-footprint layouts - making it optimal for cost-sensitive, battery-life-driven portable designs.
Availability
LTC3542IS6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital cameras, and handheld PDAs requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3542IS6#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 precision analog and power management portfolio. Linear's legacy ICs emphasize high efficiency, low noise, and robust operation in demanding portable and industrial environments.
The LTC3542IS6#TRMPBF belongs to Linear's high-frequency synchronous buck converter family, designed specifically for space-constrained, battery-powered applications where ultralow quiescent current, ceramic-capacitor compatibility, and seamless transition between operating modes are essential.
FAQ
What is the maximum output current supported by the LTC3542IS6#TRMPBF?
The LTC3542IS6#TRMPBF is rated for continuous output current up to 500mA. This is validated across the full –40°C to +125°C operating temperature range for the "I" grade. Peak switch current capability reaches 1000mA, allowing brief transient surges without saturation, provided thermal limits are observed and proper PCB copper area is used for heat dissipation in the TSOT-23-6 package.
Does the LTC3542IS6#TRMPBF require an external Schottky diode?
No, the LTC3542IS6#TRMPBF does not require an external Schottky diode. It integrates both high-side P-channel and low-side N-channel MOSFETs in a synchronous rectification configuration. This eliminates reverse recovery losses and forward voltage drop associated with external diodes, improving efficiency and reducing component count and board area.
How does the MODE/SYNC pin function on the LTC3542IS6#TRMPBF?
The MODE/SYNC pin on the LTC3542IS6#TRMPBF serves three functions: grounding selects Burst Mode (26μA IQ), connecting to VIN selects pulse-skip mode (lower ripple), and applying a 1–3MHz square wave enables external clock synchronization. During synchronization, the device automatically enters pulse-skip mode and aligns top-switch turn-on to the falling edge of the external clock signal.
What is the operating temperature range for the LTC3542IS6#TRMPBF?
The LTC3542IS6#TRMPBF is specified for operation from –40°C to +125°C ambient temperature. This "I" grade rating ensures guaranteed performance over the full industrial temperature range, including thermal shutdown activation at ~160°C junction temperature and stable regulation under worst-case voltage, load, and thermal conditions.
Can the LTC3542IS6#TRMPBF operate with 100% duty cycle, and what is its significance?
Yes, the LTC3542IS6#TRMPBF supports 100% duty cycle operation. When input voltage approaches the output voltage, the high-side P-channel MOSFET remains continuously on, minimizing dropout voltage to only the sum of RDS(ON) × ILOAD and inductor DCR × ILOAD. This extends usable battery life in Li-Ion systems by sustaining regulation down to ~2.0V input for a 1.8V output, delaying system brownout.
LTC3542IS6#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3542IS6#TRMPBF FAQ
1.How can I place an order for LTC3542IS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3542IS6#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 LTC3542IS6#TRMPBF reliable?
The price and inventory of LTC3542IS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3542IS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3542IS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3542IS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3542IS6#TRMPBF?
LTC3542IS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3542IS6#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 LTC3542IS6#TRMPBF?
For technical support, including LTC3542IS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3542IS6#TRMPBF requirements.
6.How does Aetrix verify that LTC3542IS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3542IS6#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 LTC3542IS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3542IS6#TRMPBF?
All LTC3542IS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3542IS6#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 LTC3542IS6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3542IS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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