LTC3544EUD#PBF

LTC3544 is a quad, high efficiency, monolithic synchronous buck regulator using a constant-frequency, current mode architecture. The four regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the device well suited for single Li-ion/polymer battery-powered applications. 100% duty cycle provides low dropout operation, extending battery runtime in portable systems. Low ripple Burst Mode® operation increases efficiency at light loads, further extending battery runtime with typically only 20mV of ripple. Switching frequency is internally set to 2.25MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switches increase efficiency and eliminate the need for external Schottky diodes. It is used in application such as cellular telephones, personal information appliances, wireless and DSL modems, digital still cameras, media players, portable instruments etc.

• High efficiency upto 95%, no schottky diodes required
• Extremely low channel-to-channel transient crosstalk
• Oscillator frequency is 2.25MHz typical at (VIN = 3V, TA = 25°C)
• 0.8V reference allows low output voltages
• Current mode operation for excellent line and load transient response
• Overtemperature protected
• Shutdown current is 2µA max at (TA = 25°C, VIN = 3.6V)
• Soft-start period is 875μs typical at (VFB = 7.5% to 92.5% full scale)
• Operating temperature is -40°C to 85°C
• Package style is 16-lead plastic QFN

注释

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