LX1684 Datasheet PDF – Voltage Mode PWM Controller

Part Number: LX1684

Function: Voltage-Mode PWM Controller / DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC

Package: Surface Mount 14 Pin Type

Manufacturer: Microsemi Corporation


LX1684 datasheet


The LX1684 is a monolithic, voltage mode pulse-width modulator controller. It is designed to implement a flexible, low cost buck (step-down) regulator supply with a minimal of external components. Under-voltage lockout and soft-start provide for optimal start-up performance. The dual
functionality of the soft-start pin causes the LX1684 to enter a shutdown mode when pulled to
ground. The PWM switching frequency is fixed at 175kHz making the LX1684 optimized for
low-cost components. In addition short-circuit current limiting can be implemented without
expensive current sense resistors.


1. Fixed 175kHz Switching Frequency
2. Constant Frequency Voltage-Mode Control Requires NO External Compensation
3. Hiccup-Mode Over-Current Protection
4. High Efficiency
5. Adjustable Output Voltage Set By Resistor Divider
6. Under-Voltage Lockout
7. Soft-Start And Enable
8. Synchronous Rectification

Application Circuts :



1. 12V to 3.3V Or Less Buck Regulators
2. Microprocessor Core Supplies
3. Hard Disk Drives
4. General 3.3V Supplies
5. Computer Add-on Cards
6. General Purpose DC:DC Conversion
7. Graphic Cards

Other data sheets are available within the file: LX1684CD, LX1684CD-TR

LX1684 Datasheet PDF Download

LX1684 pdf

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