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Reverse current protection
The CM3019 is a CMOS linear voltage regulator with low
quiescent current, very low drop out voltage and better
than 1% initial output voltage accuracy.
The quiescent current is typically 150碌A at light loads and
only 165碌A at 500mA. This is 5% more efficient than
equivalent Bi-CMOS devices that can waste up to 25mA at
500mA.
Load regulation is maintained for peak currents up to
500mA. This is useful for supplying inrush currents during
power-up and transient conditions. Continuous output
current is limited by package type and board layout.
A dedicated control input (EN, Active High) has been
included for power-up sequencing flexibility. When this
input is taken low, the regulator is disabled. In this state,
the supply current will drop to near zero.
The device also features reverse current protection. This
protects the device by blocking the pass transistors
parasitic diode when the output voltage is forced higher
than the input.
For low noise performance and increased power supply
ripple rejection a noise bypass capacitor can be connected
to the BYP pin. Connecting this capacitor will not
significantly delay the speed of power-up.
The CM3019 is fully protected, offering both overload
current limiting and high temperature thermal shutdown.
To reduce board cost and layout size the CM3019 was
designed to be stable with or without any output capacitor.
This includes tiny, low ESR ceramic capacitors.
Housed in a low profile MSOP8 package, or a SOT23-
5/SOT23-6, the device is ideal for space critical
applications.
Applications
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Notebook, and palmtop computers
Cell phones and battery powered devices
Consumer and personal electronics
PC Card Vcc and Vpp regulation and switching
Table 1: CM3019 Regulator Family
Product
Output Voltage
CM3019-00
Adjustable
CM3019-12
1.2V
CM3019-15
1.5V
CM3019-18
1.8V
CM3019-25
2.5V
CM3019-28
2.8V
CM3019-30
3.0V
CM3019-33
3.3V
For other output voltages, please contact the factory
Typical Application Circuit
Block Diagram
漏 2004 California Micro Devices Corp. All rights reserved
02/20/04
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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