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2022-09-24 23:18:44
MB3891 - Power Management IC for GSM Mobile Phone
describe
MB3891 is intended to be used in future GSM cell phones, dual-band cell phones and dual-mode cell phones. It contains all the necessary functions to support all digital, analog and RF modules of these phones. The charge pump includes a logic level conversion circuit built into the support of both 3 and 5 volt technologies for SIM cards (smart cards). This circuit contains a rechargeable lithium real time clock coin cell battery charger. A complex control circuit is built upon master reset to generate and turn on and off the various LDOs. ...
Features • Supply voltage range: 3 V to 5.5 V
• Low power standby current: 400mA (max)
• 6-channel low-saturation voltage type series regulator: 2.1 V/channel 2, 2.8 V/channel 3, 2.5 V/2.8 V switch • Error in low voltage protection function • Power-on reset function • 3 V/No. 5 SIM card V SW • SIM card interface function • Backflow prevention for battery backup • Temperature protection function