RICHTEK RT6154AGQW

The RT6154A/B is a high efficiency single inductor BuckBoost Converter which can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 4A. The maximum peak current in the switches is limited to a typical value of 5A at V_IN=3.6V and 2.6A at V_IN=2.1V. The RT6154A/B feedback loop is internally compensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes and optimal transient response. The RT6154A/B operates at 2.4MHz typical switching frequency in full synchronous operation. The RT6154A/B operates in Pulse Skipped Modulation (PSM) mode for increasing efficiency during low power RF transmission modes. The Power Save Mode can be disabled, forcing the RT6154A/B to operate at a fixed switching frequency operation at 2.4MHz. The RT6154A/B can also be synchronized with external frequency from 2.2MHz to 2.6MHz. The RT6154A output voltage is programmable using an external resistor divider, and the RT6154B is fixed internally to 3.3V.

• Operates from a Single Li-ion Cell : 1.8V to 5.5V
• Adjustable Output Voltage : 1.8V to 5.5V
• 3A Maximum Load Capability for V_IN>3.6V, V_OUT=3.3V
• Power Save Mode (PSM) for Improving Low Output Power Efficiency
• Fixed Frequency Operation at 2.4MHz and Synchronization Possible from 2.2MHz to 2.6MHz
• Up to 96% Efficiency
• Input Current Limit
• Internal Compensation
• RoHS Compliant and Halogen Free

• Cellular Phones
• Portable Hard Disk Drives
• PDAs