參數(shù)資料
型號(hào)： RT9184
廠商： Electronic Theatre Controls, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 500 MA DUAL LDO REGULATOR
中文描述： 500馬雙LDO穩(wěn)壓器
文件頁數(shù)： 5/10頁
文件大小： 186K
代理商： RT9184
Preliminary
RT9184
DS9184-00 March 2002
www.richtek-ic.com.tw
5
Functional Description
The RT9184 integrate two low noise, low dropout,
and low quiescent current linear regulators. Output
voltages are optional ranging from 1.5V to 3.3V, and
each channel can supply current up to 500mA.
Internal P-Channel Pass Transistor
The RT9184 features double typical 1.3
P-channel
MOSFET pass transistors. It provides several
advantages over similar designs using PNP pass
transistors. The P-channel MOSFET requires no
base drive, which reduces quiescent current
significantly than PNP-based regulator, which wastes
considerable current in dropout when the pass
transistor saturates. They also use high base-drive
currents under large loads. The RT9184 does not
suffer from these problems and consume only 185
μ
A
of quiescent current whether in dropout, light-load, or
heavy-load applications.
Current Limit and Thermal Protection
The RT9184 includes two independent current limit
structure which monitor and control each pass
transistor’s gate voltage limiting the guaranteed
maximum output current to 510mA minimum.
Thermal-overload protection limits total power
dissipation in the RT9184. When the junction
temperature exceeds T
J
= +180°C, the thermal
sensor signals the shutdown logic turning off the pass
transistor and allowing the IC to cool down. The
thermal sensor will turn the pass transistor on again
after the IC’s junction temperature cools by 20°C,
resulting in a pulsed output during continuous
thermal-overload
conditions.
protection is designed to protect the RT9184 in the
event of fault conditions. Do not exceed the absolute
maximum junction-temperature rating of T
J
= +125°C
for continuous operation. The output can be shorted
to ground for an indefinite amount of time without
damaging the part by cooperation of current limit and
thermal protection.
Thermal-overloaded
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