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MC33680

Dual DC−DC Regulator for Electronic Organizer

ON Semiconductor 

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 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.

FEATURES:

• Low Input Voltage, 1V up

• Low Quiescent Current in Standby Mode: 35μA 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)

http://onsemi.com

32 1

32−LEAD LQFP

FTB SUFFIX

CASE 873A

PIN CONNECTIONS &

DEVICE MARKING

VAUXSW

VAUXEMR

LIBATIN

LIBATOUT

NC

VMAINGND

VMAINSW

VMAIN

MC33680

FTB

AWLYYWW

NC

DGND

LIBATCL

LIBATON

LOWBATB

PORB

DGND

LOWBATSEN

(Top View)

ORDERING INFORMATION

Device

Package

Shipping

MC33680FTB

LQFP 1250 Tray / Drypack

MC33680FTBR2 LQFP 1800 / Tape & Reel

© Semiconductor Components Industries, LLC, 2006

1

July, 2006 − Rev. 4

Publication Order Number:

MC33680/D

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