LTC3542IS6#TRMPBF

LTC3542IS6#TRMPBF is a high-efficiency monolithic synchronous buck converter using a constant frequency, current-mode architecture. Supply current during operation is only 26μA, dropping to <1μA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3542 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. The output voltage is adjustable from 0.6V to VIN. Internal power switches are optimized to provide high efficiency and eliminate the need for an external Schottky diode. The 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. Applications include cellular telephones, wireless and DSL modems, digital cameras, MP3 players, PDAs, and other handheld devices.

• Current mode operation for excellent line and load transient response
• Overtemperature protected, internal soft-start limits inrush current
• Input voltage range from 2.5V to 5.5V, high efficiency: up to 96%
• Low dropout operation: 100% duty cycle, no Schottky diode required
• Feedback input current is ±30nA maximum at (TA = 25°C)
• Oscillator frequency is 2.25MHz typical at (VFB = 0.6V)
• Input DC supply current (sleep mode) is 26μA typical at (VFB = 0.7V, MODE = 0V, TA = 25°C)
• Shutdown input DC supply current is 0.1μA typical at (RUN = 0V, TA = 25°C)
• Output voltage load regulation is 0.02% typical at (ILOAD = 100mA to 500mA, TA = 25°C)
• Operating temperature range from -40°C to 125°C, 6-lead plastic TSOT-23 package

Notes

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