LM3269 Datasheet | Texas Instruments

Features - 1 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-m A 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 m A - Input Overcurrent Limit - Internal pensation 2 Applications - Power Supply for 3G/4G Power Amplifiers - Cellular Phones - Portable Hard Disk Drives - PDAs 3 Description 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 energysaving Pulse Frequency Modulation (PFM) mode for increased efficiencies and current savings during lowpower 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 pensated for buck and boost modes of operation, thus providing an optimal transient response. When considering using the LM3269 in a system design, please review the layout instruactions at the end of this document. PART NUMBER LM3269 Device Information(1) PACKAGE BODY SIZE (MAX) DSBGA (12) 2.529 mm x 2.022 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application 2.2 2H VBATT: 2.7V to 5.5V 10 2F SW1 SW2 PVIN PVIN VOUT FB EN VCON VOUT: 0.6V to 4.2V RF...