Microsemi NX2155H
The NX2155H controller IC is a single input supply synchronous Buck controller IC designed for step down DC to DC converter applications. The NX2155H is optimized to convert bus voltages from 8V to 22V to output as low as 0.8V voltage. The NX2155H operates at a programmable frequency of 2MHz, and employs loss-less current limiting by sensing the Rdson of synchronous MOSFET followed by hiccup feature.| Part No. | NX2155H |
|---|---|
| Datasheet | NX2155H Download |
| Manufacturer |  Microsemi |
| Description | Single Power Supply Synchronous PWM Controller |
| Buy | Stock & Price |
DESCRIPTION
An internal regulator converts the bus voltage to 5V, which provides voltage supply to internal logic and driver circuits. Feedback undervoltage triggers the Hiccup mode. Other features of the device are: Internal Schottky diode, thermal shutdown, 5V gate drive, adaptive deadband control, internal digital soft start, 5VREG undervoltage lock out and Shutdown capability via the comp pin.FEATURES
● Single Supply Voltage from 8V to 22V● Internal 5V Regulator
● Programmable Operational Frequency of 2MHz
● Internal Digital Soft Start Function
● Less than 50nS Adaptive Deadband
● Current Limit Triggers Hiccup by Sensing RDSON of Synchronous MOSFET
● Pb-
APPLICATIONS
● LCD TV● Graphic Card on Board Converters
● Memory Vddq Supply in Mother board
APPLICATIONS
● On board DC to DC such as 12V to 3.3V, 2.5V, or 1.8V● Hard Disk Drive
● Set Top Box Typical Application Diagram 5 5VREG 6 VIN BST 3 0.1µF M1 AO6800 4.7µF HDRV 2 SW 1 NX2155H OCP 10 7 RT 4.22k LDRV 4 0.1µF 6.04k 8 COMP GND (PAD) FB 9 15k VIN +12V 10µF 1µH 301 180pf 49.9k 1nF 9.53k VOUT +5V@2A 10µF x 2, 10V, X5R 10pF September 2013 Rev.
