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PDF MAS9251 Data sheet ( Hoja de datos )
| Número de pieza | MAS9251 | |
| Descripción | REGULATED CHARGE PUMP DC/DC CONVERTER | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAS9251 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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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
1 (11)
1 page  
DA9251.001
25 October, 2001
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Threshold High
TH
Threshold Low
TL
The hysteresis of 10 oC prevents the device from turning on too soon after thermal shut-down.
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Shutdown Voltage
OFF State
VCTRL
−0.3
ON State
1.6
Shutdown Control Input Pin
ICTRL
VCTRL = VIN
Current
VCTRL = 0 V
If CTRL-pin is not connected, MAS9251 is in OFF state (900 kΩ pull-down resistor to ground).
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Thermal Resistance MSOP-8
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Maximum Power Dissipation
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typical PC board mounting
any ambient temperature
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Efficiency
η VIN = 3 V, IOUT = 50 mA 80 %
Irà : TJ(MAX) denotes maximum operating junction temperature (+125°C), TA ambient temperature, and RJA junction-to-air thermal
resistance (206.3°C/W).
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Start-up Time (from control
signal edge to 90% of VNOM)
Switching Frequency
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VCTRL = 0 to VIN, VIN = 3 V,
IOUT ≤ 100 mA
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5 (11)
5 Page 
DA9251.001
25 October, 2001
25'(5,1* ,1)250$7,21
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Fixed 5 V Output
Voltage Charge Pump
Adjustable Output
Voltage Charge Pump
Fixed 5 V Output
Voltage Charge Pump
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AF
(T1)
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(T2)
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MSOP-8
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Chip Scale Package
(CSP)
(to be qualified)
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Tape and Reel
Tape and Reel
Tape and Reel
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Micro Analog Systems Oy
Kamreerintie 2, P.O.Box 51
FIN-02771 Espoo, FINLAND
Http://www.mas-oy.com
Tel. (09) 80 521
Tel. Int. +358 9 80 521
Telefax +358 9 805 3213
E-mail: [email protected]
IPUD8@
Micro Analog Systems Oy reserves the right to make changes to the products contained in this data sheet in order to improve the design or
performance and to supply the best possible products. Micro Analog Systems Oy assumes no responsibility for the use of any circuits
shown in this data sheet, conveys no license under any patent or other rights unless otherwise specified in this data sheet, and makes no
claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and
Micro Analog Systems Oy makes no claim or warranty that such applications will be suitable for the use specified without further testing or
modification.
11 (11)
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAS9251.PDF ] | |
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