LTC3456

• Product introduction

LTC34562 cell, multiple output DC/DC to USBPower Manager

peculiarity

• Seamless Transition Between 2-Cell Battery, USB and AC Wall Adapter Input Power Sources Seamless transition between 2 battery, USB and AC wall adapter input power
• Main Output: Fixed 3.3V Output Main output: 3.3V fixed output
• Core Output: Adjustable from 0.8V to V_BATT(MIN) Core Output: Adjustable from 0.8V to V_{BAT Small (Minimal)}
• Hot SwapTM Output for Memory Cards Memory card hot SwapTM output
• All Outputs Discharged to Ground During Shutdown During shutdown, all outputs are discharged to ground
• Power Supply Sequencing:Main and Hot Swap Outputs Come Up After Core Output Power sequencing:The primary and hot-swappable outputs come up after the core outputs
• Accurate USB Current Limiting Accurate USB current limit
• High Frequency Operation: 1MHzHigh frequency operation: 1MHz
• High Efficiency: Up to 92%High efficiency: up to 92%
• Small (4mm × 4mm × 0.75mm) 24-Pin QFN PackageSmall size (4mm×4mm ×0.75mm) 24-pin QFN package
• descriptionThe 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 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.The device generates two independent 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_.MAXoutput.In addition, the LTC3456 contains a USB power management, hot-swappable output, low battery indicator and an alwaysalive V_.MAXOutput. 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.The LTC3456 uses power from one of three sources: a wall adapter, a USB port, or 2 alkaline/NiC/NiMH batteries, in such a prioritized order. Current drawn from the USB port is accurately limited to 100mA or 500mA based on the state of the USBHP pin.Accurately limits the current drawn from the USB port to 100mA or 500mA based on the status of the USBHP pin.

  The Main and Core switchers are all high efficiency, 1MHz fixed frequency PWM converters.Both the main and core switches are 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.Availability (available in 4mm x 4mm ×0.75mm) 24-lead QFN package makes the LTC3456 ideal for space-sensitive portable devices.

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  • GPS Portable NavigatorsGPS portable navigator
  • MP3 PlayersMP3 player
  • Digital CamerasDigital cameras
  • Handheld ComputersPocket PC