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參數(shù)資料
| 型號： | AIC1577-PSTR |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | External NMOS Step-Down PWM Controller |
| 中文描述： | 外部NMOS降壓型PWM控制器 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大小： | 346K |
| 代理商： | AIC1577-PSTR |
AIC1577
External NMOS Step-Down PWM Controller
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N-Channel MOSFET Drive
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LCD Monitor
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Operating Input Voltage from 4.5V to 24V
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Wide Ouput Range : 0.8V to 20V
z
±
1.5% 0.8V Reference
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Low Dropout Operation : 95% Duty Cycle
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500KHz Fixed Constant Frequency
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Low Standby Current, I
Q
Typically 720
μ
A
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Logic-Control Micropower Shutdown
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Output Overvoltage Protection
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Internal Diode for Bootstrapped Gate Drive
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Current Mode Operation for Excellent Line and
Load Transient Response
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Available in an 8-Lead SO and MSOP Package
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Palmtop Computers, PDAs
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Wireless Modems
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On-Card Switching Regulators
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DC Power Distribution Systems
The AIC1577 is a current mode switching
regulator controller that drives external N-
channel power MOSFET using a fixed fre-
quency architecure. It uses external divider to
adjust output voltage from 0.8V to 20V with
excellent line and load regulation. A maximum
high duty cycle limit of 95% provides low
dropout operation which extends operating
time in battery-operated systems.
Switching frequency up to 500KHz are
achievable thus allowing smaller sized filter
components. The operating current level is
user-programmable via an external current
sense resistor. It also provide output overvolt-
age protection under fault conditions.
A multifunction pin (I
TH
/RUN) allows external
compensation for optimum load step re-
sponse plus shutdown. Soft start can also be
implemented with this pin to properly se-
quence supplies. Package available are in
SOP8 and MSOP8 for SMD.
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
DS-1577P-02 010405
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
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