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MC34280

Power Supply & Management IC for Handheld Electronic Products

ON Semiconductor 

MC34280

PMEolaewncaetrgroeSnmuicpepPnltryoIdC&ufcotrsHandheld

The MC34280 is a power supply integrated circuit which provides

two boost regulated outputs and some power management supervisory

functions. 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; or by a

microprocessor, digitally through a 6–bit internal DAC.

The MC34280 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 MC34280 is best suited to operate from 1

to 2 AA/ AAA cell. Moreover, supervisory functions such as low

battery detection, CPU power–on reset, and back–up battery control,

are also included in the chip. It makes the MC34280 the best one–chip

power management solution for applications such as electronic

organizers and PDAs.

FEATURES:

• Low Input Voltage, 1V up

• Low Quiescent Current in Standby Mode: 35µA typical

• PFM and Synchronous Rectification to ensure high efficiency

(87% @200mA Load)

• Adjustable Main Output: nominal 3.3V @ 200mA max, with 1.8V

input

• Auxiliary Output Voltage can be digitally controlled by

microprocessor

• Auxiliary Output Voltage:

+5V @ 25mA max, with 1.8V input

+25V @ 15mA max, with 1.8V input

• Current Limit Protection

• Power–ON Reset Signal with Programmable Delay

• Battery Low Detection

• Lithium Battery Back–up

• 32–Pin LQFP Package

http://onsemi.com

32–LEAD LQFP

FTB SUFFIX

CASE 873A

MARKING DIAGRAM

MC34280F

TB

AWLYYWW

A = Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

32

1

PIN CONNECTIONS

32

1

VMAINFB

VBAT

ENABLE

VDD

PDELAY

VREF

AGND

IREF

MC34280

NC

VAUXBASE

VAUXCHG

VAUXBDV

VAUXFBN

VAUXREF

VAUXFBP

VAUXEN

APPLICATIONS:

• Digital Organizer and Dictionary

• Personal Digital Assistance (PDA)

• Dual Output Power Supply (For MPU, Logic, Memory, LCD)

• Handheld Battery Powered Device (1–2 AA/AAA cell)

ORDERING INFORMATION

Device

Package

Shipping

MC34280FTB

LQFP

250 Units/Tray

MC34280FTBR2

LQFP 1800 Tape & Reel

© Semiconductor Components Industries, LLC, 1999

1

February, 2000 – Rev. 2

Publication Order Number:

MC34280/D

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