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AT1314 Datasheet High-efficiency Step-down Current Regulator

Manufacturer: Aimtron Technology

Overview: .. AT1314 Preliminary Product Information High-Efficiency Step-Down Current Regulator For LEDs Feature ‧ 4.75V to 16V Supply Voltage Operating AT1314 is a voltage-mode PWM step-down DC-DC converter capable of driving up to 1A Range. over a wide input supply range with excellent ‧ 600KHz 15% Fixed Switching Frequency. loads line and load regulation characteristics. High ‧ Voltage-Mode PWM Step-Down Regulator. efficiency is obtained through the use of a low ‧ Built-in Power MOSFET, Rds(on) 100m . Rds(on) P-channel power switch. ‧ 1A Output Current, Up to 91.9% Efficiency It uses a fixed switching frequency up to 600KHz ‧ 0.4V 1.5% Internal Reference thus allowing smaller sized ponents. The ‧ Shutdown Current less than 20uA. output voltage level is user-programmable via an ‧ Thermal-Shutdown and Built-in Soft-Start. external resistive voltage divider. The built-in ‧ Cycle-by-Cycle Current-Limit Protection. soft-start can reduce inrush current on the input ‧ Under-Voltage Lockout Protection. source at turn on. ‧ Output Voltage Adjustable From 0.4V to 16V. The device also has built-in cycle-by-cycle ‧ SOP-8 Package. current-limit, thermal shutdown, under-voltage lockout and an ON/OFF logic-control that can Application power down the regulator to a shutdown mode. In ‧ Backlight for LCD Panels shutdown mode the regulator draws less than 20uA of supply current. ‧ Battery-Powered Backlight Applications ‧ Cell Phones AT1314 is available in SOP-8 package. ‧ PDAs ‧ Other Handheld Devices with Dual Displays.

Datasheet Details

Part number AT1314
Manufacturer Aimtron Technology
File Size 338.07 KB
Description High-Efficiency Step-Down Current Regulator
Datasheet AT1314_AimtronTechnology.pdf

General Description

Block Diagram EN Regulator Current Sense Amplifier Current Sense + Contol Logic IN P-MOS OSC 600KHz PWM parator Error Amplifier + 0.4V SoftStart SW GND FB P Aimtron reserves the right without notice to change this circuitry and specifications.

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878 Fax: 886-3-563-0879 : http://.aimtron..tw 3/24/2006 REV:2.0 Email: se

Key Features

  • a PWM step-down converter operating with a fixed switching frequency of 600 KHz and uses internal power MOSFET to provide maximum efficiency. The output voltage of the converter can be set as low as 0.4V with external resistive divider. When trans-conductance signal is higher than saw-tooth wave, then PWM comparator will produce ON-time signal to set internal flip-flop, which turns on the switching power MOSFET. The external inductor current ramps up linearly, storing energy in a magnetic field.

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