MC33680

Dual DC-DC Regulator for Electronic Organizer

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.

アプリケーション

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

特長

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

材料組成

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状態

CAD Models

Compliance

Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

Topology

Control Mode

V_CC Min (V)

V_CC Max (V)

V_O Typ (V)

I_O Typ (A)

Efficiency (%)

f_SW Typ (kHz)

Reference Price

MC33680FTB

Obsolete

LQFP-32

235

JTRAY

250

2.7 to 5.0

0.2

100

Price N/A

MC33680FTBR2

Obsolete

LQFP-32

235

REEL

1800

2.7 to 5.0

0.2

100

Price N/A

製品番号:

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Converters | MC33680

Dual DC-DC Regulator for Electronic Organizer

Overview

Product List

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