Converters | MC33680

Dual DC-DC Regulator for Electronic Organizer

Obsolete

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Overview

The MC33680 is a dual DC-DC regulator designed for electronic organizer applications. Both regulators apply Pulse-Frequency-Modulation (PFM). The main step-up 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 built-in 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 hand-held products. With the low start-up voltage from 1V and the low quiescent current (typical 35 µA); the MC33680 is best suited to operate from 1 to 2 AA/ AAA cell. Moreover, supervisory functions such as low battery detection, CPU Power-Good signal, and back-up battery control, for lithium battery or supercap are also included in the chip.

  • Digital Organizer and Dictionary
  • Dual Output Power Supply (For MPU, Logic, Memory, LCD)
  • Handheld Battery Powered Device (1-2 AA/AAA cell)

  • 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
  • Power-Good Signal with Programmable Delay
  • Battery Low Detection
  • Lithium Battery or Supercap Back-up
  • 32-Pin LQFP Package

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MC33680FTB

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Obsolete

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CAD Model

Pb

A

H

P

LQFP-32

2

235

JTRAY

250

N

-

-

1

7

2.7 to 5.0

0.2

87

100

Price N/A

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MC33680FTBR2

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Obsolete

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CAD Model

Pb

A

H

P

LQFP-32

2

235

REEL

1800

N

-

-

1

7

2.7 to 5.0

0.2

87

100

Price N/A

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