MAS9251 Datasheet, PDF (1/11 Pages) List of Unclassifed Manufacturers – REGULATED CHARGE PUMP DC/DC CONVERTER

DA9251.001
25 October, 2001
This is preliminary information on a new
product under development. Micro Analog
Systems Oy reserves the right to make any
changes without notice.
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MAS9251 is a low noise, constant frequency
switched capacitor voltage doubler with regulated
output. In the adjustable output version an external
feedback pin allows the output voltage to be
adjusted.
The high switching frequency of MAS9251
guarantees low output ripple even with small
ceramic capacitors. The shutdown control pin can
be used to turn off the device for power saving.
MAS9251 is equipped with soft-start feature, which
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• Two versions:
Adjustable Output
Fixed 5 V Output
• Solution without Inductors
• Soft-Start
• Output Accuracy < ± 4%
• Low External Part Count
• Low Noise
• Input Voltage Range: 2.7 V… 4.5 V
• Shutdown Control
• 1 MHz Switching Frequency
• Internal Thermal Shutdown
• Short Circuit Protection
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reduces the circuit’s disturbance to power supply
lines during start-up by limiting the maximum input
current.
Low operating input voltage and low external part
count make MAS9251 ideal for small battery
powered portable systems. An internal thermal
protection circuit prevents the device from
overheating. Also the maximum output current is
internally limited.
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• LED Backlighting
• White LED Driver
• LED Brightness Control
• Li-Ion Battery Backup Supplies
• Local 3 V to 5 V Conversion
• Smart Card Readers
• PCMCIA Local 5 V Supplies
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