The LM3269 is buck-boost DC-DC converter designed to generate output voltages above or below a given input voltage and is particularly suitable for portable applications powered by a single-cell Li-ion battery.
The LM3269 operates at a 2.4-MHz typical switching frequency in full synchronous operation and provides seamless transitions between buck and boost operating regimes. The LM3269 operates in energy-saving Pulse Frequency Modulation (PFM) mode for increased efficiencies and current savings during low-power RF transmission modes.
The power converter topology needs only one inductor and two capacitors. A unique internal power switch topology enables high overall efficiency.
The LM3269 is internally compensated for buck and boost modes of operation, thus providing an optimal transient response.
Operates From a Single Li-Ion Cell: 2.7 V to 5.5 V
Adjustable Output Voltage: 0.6 V to 4.2 V
Automatic PFM or PWM Mode Change
750-mA Maximum Load Capability for VBATT ≥ 3 V, VOUT = 3.8 V
2.4-MHz (typical) Switching Frequency
Seamless Buck-Boost Mode Transition
Fast Output Voltage Transition: 1.4 V to 3 V in 10 µs
High-Efficiency: 95% typical at VBATT = 3.7 V, VOUT = 3.3 V, at 300 mA