5

A8450KLB-DS, Rev. 1

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

A8450

Automotive Multioutput Voltage Regulator

VREG Monitor

AB

POR event initiates

+7 V

ENBAT signals power-on

Charge pump ramping

Charge pump OK flag set

ENB signals power-off

A

B

Timing Diagrams

Figure 1a. NPOR fault due to undervoltage lockout on the V33 or FB pins

Figure 1c. Power-on using ENBAT, followed by power-off using ENB