LM3676 Datasheet | Texas Instruments

FEATURES - 2 16µA Typical Quiescent Current - 600m A Maximum Load Capability - 2MHz Typical PWM Fixed Switching Frequency - Automatic PFM/PWM Mode Switching or Forced PWM Mode - Available in Fixed Output Voltages and Adjustable Version - 8-Lead Non-Pullback WSON Package - Internal Synchronous Rectification for High Efficiency - Internal Soft Start - 0.01µA Typical Shutdown Current - Operates From a Single Li-Ion Cell Battery - Only Three Tiny Surface-Mount External ponents Required (One Inductor, Two Ceramic Capacitors) - Current Overload and Thermal Shutdown Protection APPLICATIONS - Mobile Phones - PDAs - MP3 Players - WLAN - Portable Instruments - Digital Still Cameras - Portable Hard Disk Drives DESCRIPTION The LM3676 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.9V to 5.5V. It provides up to 600m A load current, over the entire input voltage range. There are several different fixed voltage output options available as well as an adjustable output voltage version. The LM3676 has a mode-control pin that allows the user to select continuous Pulse Width Modulation (PWM) mode over the plete load range or an intelligent PFM-PWM mode that changes modes depending on the load. PWM mode offers superior efficiency under high load conditions (>100m A) and the lowest output noise performance. In Auto mode, PFM-PWM, hysteretic PFM extends the battery life through reduction of the quiescent current to 16µA (typ.) during light loads and system standby. The LM3676 is available in a 8-lead non-pullback WSON package in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ) allows use of tiny surface-mount ponents, an inductor and two ceramic capacitors. TYPICAL APPLICATION CIRCUITS VIN 2.9V to 5.5V CIN 4.7 PF VIN 8 L1: 2.2 PH 2 SW PGND NC EN FB 14 SGND 67 5 3 MODE VOUT COUT 10 PF Figure 1. Typical Application...