LTC3549EDCB#TRPBF

LTC3549 is a high efficiency, monolithic synchronous buck regulator using a constant-frequency, current mode architecture. The output voltage is adjusted via an external resistor divider. A fixed switching frequency of 2.25MHz is supported. This switching frequency allows the use of small surface mount inductors and capacitors, including ceramics. The 1.6V to 5.5V input voltage range makes the device ideally suited for single cell Li-Ion, Li-metal and 2-cell alkaline, NiCd or NiMH battery-powered applications. Burst Mode operation can be user-enabled, increasing efficiency at light loads, further extending battery life. The internal synchronous switch increases efficiency and eliminates the need for An external schottky diode. Internal soft-start offers controlled output voltage rise time at start-up without the need for external components. It is used in application such as 2 AA-cell applications, cellular phones, digital cameras, MP3 players etc.

• Internal soft-start, output ripple is 20mVP-P
• 250mA output current (VIN = 1.8V, VOUT = 1.2V)
• 450mA peak inductor current
• 0.611V reference voltage, stable with ceramic capacitors
• Current mode operation for excellent line and load transient response
• Overtemperature protection
• Feedback current is ±30nA maximum
• Operating temperature is -40°C to 85°C
• Package style is 6-lead plastic DFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party