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Part Number: MC33680FTBR2

 

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Description: The MC33680 is a dual DCDC regulator designed for electronic organizer applications. Both regulators a...


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MC33680FTBR2 General Description


The MC33680 is a dual DCDC regulator designed for electronic organizer applications. Both regulators apply PulseFrequencyModulation (PFM). The main stepup regulator output can be externally adjusted from 2.7V to 5V. An internal synchronous rectifier is used to ensure high efficiency (achieve 87%).

The auxiliary regulator with a builtin power transistor can be configured to produce a wide range of positive voltage (can be used for LCD contrast voltage). This voltage can be adjusted from +5V to +25V by an external potentiometer.

The MC33680 has been designed for battery powered handheld products. With the low startup voltage from 1V and the low quiescent current (typical 35 mA); the MC33680 is best suited to operate from 1 to 2 AA/ AAA cell. Moreover, supervisory functions such as low battery detection, CPU PowerGood signal, and backup battery control, for lithium battery or supercap are also included in the chip.

MC33680FTBR2 Maximum Ratings

Parameter
Symbol
Min
Max
Unit
Power Supply Voltage
Digital Pin Voltage
General Analog Pin Voltage
Pin VAUXSW to Pin VAUXEMR Voltage (Continuous)
VBAT
Vdigital
Vanalog
VAUXCE
-0.3
-0.3
-0.3
-0.3
7.0
7.0
7.0
30
Vdc
Vdc
Vdc
Vdc
pin VMAINSW to Pin VMAIN Voltage (Continuous)
Vsyn
0.3
Vdc
Operating Junction Temperature
Tj(max)
150
Ambient Operating Temperature
Ta
0
70
Storage Temperature
Tstg
-50
150

MC33680FTBR2 Features

• Low Input Voltage, 1V up
• Low Quiescent Current in Standby Mode: 35mA typical
• PFM and Synchronous Rectification to ensure high efficiency (87% @60mA Load)
• Adjustable Main Output: +2.7V to +5V nominal 3.3V @ 100mA max, with 1.8V input
• Auxiliary Output Voltage: +5V to +25V +5V @ 25mA max, with 1.8V input +25V @ 15mA max, with 1.8V input
• Current Limit Protection
• PowerGood Signal with Programmable Delay
• Battery Low Detection
• Lithium Battery or Supercap Backup
• 32Pin LQFP Package

MC33680FTBR2 Typical Application

• Digital Organizer and Dictionary
• Dual Output Power Supply (For MPU, Logic, Memory, LCD)
• Handheld Battery Powered Device (12 AA/AAA cell)

MC33680FTBR2 Connection Diagram

MC33680FTBR2 Connection Diagram

MC33680FTBR2 datasheet

MC33680FTBR2
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