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NR421A

Package Image

Package : HSOP8

RoHS : YES

Data Sheet(2.0MB)
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The NR421A is Synchronous Rectification buck regulator ICs integrates PowerMOSFETs. With the current mode control, low ESR capacitors such as ceramic capacitors can be used. It has achieved a high efficiency by the synchronous rectification system. The ICs have protection functions such as Over-Current Protection (OCP), Under-Voltage Lockout (UVLO) and Thermal Shutdown (TSD). Soft starting time can be set up by selecting an external capacitor value. The ON/OFF pin (EN Pin) turns the regulator ON/OFF. The NR421A is available in an 8-pin HSOP package with an exposed thermal pad on the back side.

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Design Support

  • Technical Documents
  • Tools / Models

Technical Documents

Tools / Models

Features

    ・For excellent heat dissipation, HSOP8 package with the
        heat-slug is adopted.
    ・Current mode PWM control
    ・Up to 94% efficiency
    ・Stable with low ESR ceramic output capacitors
    ・Built-in protection function
       Drooping type Over Current Protection (OCP) with Auto-
       restart
       Thermal Shutdown (TSD) with Auto-restart
       Under Voltage Lockout(UVLO)
    ・By the internal Phase Compensation, external component
        count reduction

Application

･LCD TV / Blu-ray /Power supply for digital consumer
･Up to 94% efficiency Synchronous rectification system
･Current mode PWM control
･By the internal Phase Compensation, external component
  count reduction
･Stable with low ESR ceramic output capacitors

Specifications

Built-in Power Power IC
Output Method Variable
Output Voltage 14.0 V
Output Current 3.0 A
Input Voltage Range 4.5 to 18 V
Operating Frequency 350 kHz
Synchronous / Asynchronous Synchronous
Current Mode Control YES
Maximum Input Voltage 18.00 V
Output On / Off YES
Low ESR Capacitor Support YES
Overcurrent Protection Drooping Type
Phase Compensation Built-in
Thermal Protection YES
UVLO YES
Package Weight (Typ.) 0.081 g
Automotive Qualified NO

Remarks

*This product is not pin compatible with NR885E.
*This product is not a replacement product of NR885E.

Typical Application

Typical Application

Block Diagram

Block Diagram

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