LM3674 Datasheet | National Semiconductor

LM3674 2MHz, 600m A Step-Down DC-DC Converter in SOT 23-5 January 2006 LM3674 2MHz, 600m A Step-Down DC-DC Converter in SOT 23-5 General Description The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600m A load current, over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions. The device offers superior Features and performance for mobile phones and similar portable systems. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ). The LM3674 is available in SOT23-5 in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ) allows use of only three tiny external surfacemount ponents, an inductor and two ceramic capacitors. Features n 600m A max load current n Input voltage range from 2.7V to 5.5V n Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V n Operates from a single Li-Ion cell Battery n Internal synchronous rectification for high efficiency n Internal soft start n 0.01 µA typical shutdown current n 2 MHz PWM fixed switching frequency (typ) n SOT23-5 package n Current overload protection and Thermal shutdown protection Applications n n n n n n n Mobile phones PDAs MP3 players Portable instruments W-LAN Digital still cameras Portable Hard disk drives Typical Application FIGURE 1. Typical Application Circuit © 2006 National Semiconductor Corporation DS201672 .national. Typical Application (Continued) FIGURE 2. Typical Application Circuit Connection Diagram and Package Mark Information SOT23-5 Package NS Package Number MF05A Note: The actual physical placement of the package...