LTC3542 - 500mA, 2.25MHz Synchronous Step-Down DC/DC Converter
Switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors, and it can synchronize to an external clock signal with a frequency range of 1MHz to 3MHz through the MODE/ SYNC pin. The LTC3542 is specifically designed to work well with ceramic output capacitors, achieving very low output voltage ripple and a small PCB footprint.
The LTC3542 can be configured for the power saving Burst Mode Operation. For reduced noise and RF interference, the MODE/SYNC pin can be configured for pulse skipping operation.
Features- High Efficiency: Up to 96%
- High Peak Switch Current: 1000mA
- Low Output Ripple (<20mVP-P Typical) Burst Mode Operation: Only 26µA
- Very Low Quiescent Current: Only 26µA
- 2.5V to 5.5V Input Voltage Range
- 2.25MHz Constant Frequency Operation
- 1MHz to 3MHz External Frequency Synchronization
- Low Dropout Operation: 100% Duty Cycle
- No Schottky Diode Required
- Internal Soft-Start Limits Inrush Current
- 0.6V Reference Allows Low Output Voltages
- Shutdown Mode Draws <1µA Supply Current
- ±2% Output Voltage Accuracy
- Current Mode Operation for Excellent Line and Load Transient Response
- Overtemperature Protected
- Available in 6-Lead 2mm × 2mm DFN and Small TSOT
Typical Application
 | Applications- Cellular Telephones
- Wireless and DSL Modems
- Digital Cameras
- MP3 Players
- PDAs and Other Handheld Devices
Packaging
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Order Information
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|
| LTC3542EDC#PBF | 2x2 DFN-6 | E | $2.29 | |
| LTC3542EDC#TRMPBF | 2x2 DFN-6 | E | $2.34 | $1.65 |
| LTC3542EDC#TRPBF | 2x2 DFN-6 | E | $2.29 | $1.60 |
| LTC3542ES6#PBF | SOT-23 | E | $2.29 | |
| LTC3542ES6#TRMPBF | SOT-23 | E | $2.34 | $1.65 |
| LTC3542ES6#TRPBF | SOT-23 | E | $2.29 | $1.60 |
| LTC3542IDC#PBF | 2x2 DFN-6 | I | $3.00 | |
| LTC3542IDC#TRMPBF | 2x2 DFN-6 | I | $3.00 | $2.15 |
| LTC3542IDC#TRPBF | 2x2 DFN-6 | I | $3.00 | $2.10 |
| LTC3542IS6#PBF | SOT-23 | I | $3.00 | |
| LTC3542IS6#TRMPBF | SOT-23 | I | $3.00 | $2.15 |
| LTC3542IS6#TRPBF | SOT-23 | I | $3.00 | $2.10 |
Demo Boards
| Part Number | Description | Price |
|---|
| DC993A | LTC3542EDC Demo Board | 2.5 ≤ VIN ≤ 5.5V, VOUT = 1.2V/1.5V/1.8V @ 500mA | $75.00 |
DatasheetReliability DataPress ReleaseLTspice | Related Product- LTC3630 - High Efficiency, 65V 500mA Synchronous Step-Down Converter
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