LTC3456

• Product Introduction

LTC34562 cellular, multi-output DC/DC conversion USB power manager

peculiarity

• Seamless Transition Between 2-Cell Battery, USB and AC Wall Adapter Input Power Sources
• Main Output: Fixed 3.3V Output
• Core Output: Adjustable from 0.8V to V BATT(MIN) 核心输出：可调节从0.8V至V BATT小（最小）
• Hot SwapTM Output for Memory Cards
• All outputs discharged to ground during shutdown During shutdown
• Power Supply Sequencing: Main and Hot Swap Outputs Come Up After Core Output
• Accurate USB Current Limiting
• High Frequency Operation: 1MHz
• High Efficiency: Up to 92%
• Small (4mm × 4mm × 0.75mm) 24-Pin QFN Package (4mm× 4mm ×0.75mm) 24-pin QFN package
• 描述 The LTC®3456 is a complete power management system IC optimized for a variety of portable applications. The LTC®3456 is a complete power management system with integrated circuits optimized for a variety of portable applications. The device generates two separate power rails: a 3.3V (fixed) Main supply and a 1.8V (adjustable) Core supply. In addition, the LTC3456 contains a USB power manager, a Hot Swap output, a low-battery indicator and an alwaysalive V MAX output LTC3456. The LTC3456 takes power from one of three sources: a Wall adapter, a USB port or a 2-cell Alkaline/NiCd/NiMH battery, in that order of priority. LTC3456 take power from one of three sources: a wall adapter, a USB port or 2 alkaline/Nicadm/NiMH batteries, in such a priority order. Current drawn from the USB port is accurately limited to 100mA or 500mA based on the state of the USBHP pin.

  The Main and Core switchers are all high efficiency, 1MHz fixed frequency PWM converters. Availability in a small (4mm × 4mm × 0.75mm) 24-pin QFN package makes the LTC3456 ideal for space-sensitive portable devices LTC3456×.

• apply

  • GPS Portable Navigators GPS便携式导航仪
  • MP3 Players MP3 player
  • Digital Cameras
  • Handheld Computers