MC33680-D| Datasheet

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MC33680 Dual DC-DC Regulator for Electronic Organizer
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 A); 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.
FEATURES: http://onsemi.com

32-LEAD LQFP FTB SUFFIX CASE 873A

PIN CONNECTIONS & DEVICE MARKING
NC VAUXBASE VAUXCHG VAUXBDV VAUXFBN NC VAUXFBP VAUXEN VAUXSW VAUXEMR LIBATIN LIBATOUT NC VMAINGND VMAINSW VMAIN MC33680 FTB AWLYYWW NC DGND LIBATCL LIBATON LOWBATB PORB DGND LOWBATSEN

Low Input Voltage, 1V up Low Quiescent Current in Standby Mode: 35A 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

APPLICATIONS:

Digital Organizer and Dictionary Dual Output Power Supply (For MPU, Logic, Memory, LCD) Handheld Battery Powered Device (1-2 AA/AAA cell)
ORDERING INFORMATION
Device MC33680FTB MC33680FTBR2 Package LQFP LQFP Shipping 1250 Tray / Drypack 1800 / Tape & Reel

Semiconductor Components Industries, LLC, 2006

July, 2006 - Rev. 4

VMAINFB VBAT VBAT VDD PDELAY VREF AGND IREF

(Top View)

Publication Order Number: MC33680/D