LM2773 Datasheet | National Semiconductor

LM2773 Low-Ripple 1.8V/1.6V Spread-Spectrum Switched Capacitor Step-Down Regulator January 22, 2008 LM2773 Low-Ripple 1.8V/1.6V Spread-Spectrum Switched Capacitor Step-Down Regulator General Description The LM2773 is a switched capacitor step-down regulator that produces a selectable 1.8V or 1.6V output. It is capable of supplying loads up to 300m A. The LM2773 operates with an input voltage from 2.5V to 5.5V, acmodating 1-cell Li-Ion batteries and chargers. The LM2773 utilizes a regulated charge pump with gains of 2/3x and 1x. It has very low ripple and noise on both the input and output due to its pre-regulated 1.15MHz (typ.) switching frequency and spread spectrum operation. When output currents are low, the LM2773 automatically switches to a lowripple PFM regulation mode to maintain high efficiency over the entire load range. The LM2773 is available in National’s 0.5mm pitch 9-bump Micro-SMD (µSMD-9). Features - - - - - - - - - - - - Low-Noise Spread Spectrum Operation 1.8V/1.6V Selectable Output Voltage 2% Output Voltage Regulation > 75% Efficiency in 1.8V Mode Very Low Output Ripple: 10m V @ 300m A Output Currents up to 300m A 2.5V to 5.5V Input Voltage Range Shutdown Disconnects Load from VIN 1.15MHz Switching Frequency No Inductors…Small Solution Size Short Circuit and Thermal Protection 0.5mm pitch, µSMD-9 (1.511 × 1.511mm × 0.6mm) Applications - Power Supply for DSP's, Memory, and Microprocessors - Mobile Phones and Pagers - Digital Cameras, Portable Music Players, and Other Portable Electronic Devices Typical Application Circuit LM2773 Efficiency vs. Low-Dropout Linear Regulator (LDO) Efficiency © 2008 National Semiconductor Corporation .national. .Data Sheet.in Connection Diagram and Package Mark Information 9-Bump Micro SMD (µSMD-9) NS Package Number TLA9ZZA, 0.5mm Pitch 1.511mm x 1.511mm x 0.6mm Note 1: The actual physical placement of the package marking will vary from part to part. The...