MAS9251 데이터 시트보기 (PDF) - Unspecified

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MAS9251

Regulated Charge Pump DC/DC Converter

Unspecified 

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

• MSOP-8 and CSP Packages

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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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