CB18 Просмотр технического описания (PDF) - California Micro Devices Corp
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CB18 Datasheet PDF : 8 Pages
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CALIFORNIA MICRO DEVICES
Preliminary
CM3019
Micropower, 500mA Low Noise CMOS LDO Regulator
Features
• 500mA output current capability
• 500mA peak in SOT-23 package
• 500mA continuous in MSOP package
• 500mV maximum dropout voltage at full load
• Excellent line and load regulation
• Stable with any output capacitor
• Ultra low noise with optional bypass capacitor
• Fast power-up with bypass capacitor
• “Zero” current in Shutdown mode
• Thermal Overload Protection
• Foldback Current Limiting Protection
• Reverse current protection
Applications
• 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
Product Description
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 150µA at light loads and
only 165µA 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.
Typical Application Circuit
Block Diagram
© 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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