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MC34280FTB-MC34280FTBR2
Power Supply & Management IC for Handheld Electronic Products
!-----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
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)
