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參數(shù)資料
| 型號(hào)： | RT9184ACH |
| 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)： | 6/10頁 |
| 文件大小： | 186K |
| 代理商： | RT9184ACH |
RT9184
Preliminary
www.richtek-ic.com.tw
6
DS9184-00 March 2002
Applications Information
Capacitor Selection and Regulator Stability
Like
any
low-dropout
capacitors used with the RT9184 must be carefully
selected for regulator stability and performance.
regulator,
the
external
Using a capacitor whose value is greater than 1
μ
F on
the RT9184 input and the amount of capacitance can
be increased without limit. The input capacitor must
be located a distance of not more than 0.5" from the
input pin of the IC and returned with a clean analog
ground. Any good quality ceramic or tantalum can be
used for this capacitor. The capacitor with larger
value and lower ESR (equivalent series resistance)
provides better PSRR and line-transient response.
The RT9184 is designed specifically to work with low
ESR ceramic output capacitor in space-saving and
performance
consideration.
capacitor whose value is at least 1
μ
F on the RT9184
output ensures the stability. The RT9184 still works
well with output capacitor of other types due to the
wide stable ESR range. Output capacitor of larger
capacitance can reduce noise and improve load-
transient response, stability, and PSRR. The output
capacitor should be located not more than 0.5"
from the V
OUT
pin of the RT9184 and returned with a
clean analog ground.
Using
a
ceramic
Note that some ceramic dielectrics exhibit large
capacitance and ESR variation with temperature. It
may be necessary to use 2.2
μ
F or more to ensure
stability at temperatures below -10°C in this case.
Also, tantalum capacitors, 2.2
μ
F or more may be
needed to maintain capacitance and ESR in the
stable region for strict application environment.
Tantalum capacitors maybe suffer failure due to
surge current when it is connected to a low-
impedance source of power (like a battery or very
large capacitor). If a tantalum capacitor is used at the
input, it must be guaranteed to have a surge current
rating
sufficient
for
the
manufacture.
application
by
the
Load-Transient Considerations
The RT9184 load-transient response graphs show
two components of the output response: a DC shift
from the output impedance due to the load current
change, and the transient response. The DC shift is
quite small due to the excellent load regulation of the
IC. Typical output voltage transient spike for a step
change in the load current from 0mA to 50mA is tens
mV, depending on the ESR of the output capacitor.
Increasing
the
output
decreasing the ESR attenuates the overshoot.
capacitor’s
value
and
Input-Output (Dropout) Voltage
A
regulator’s
differential (or dropout voltage) determines the lowest
usable supply voltage. In battery-powered systems,
this will determine the useful end-of-life battery
voltage. Because the RT9184 uses a P-channel
MOSFET pass transistor, the dropout voltage is a
function of drain-to-source on-resistance [R
DS(ON)
]
multiplied by the load current.
minimum
input-output
voltage
Reverse Current Path
The power transistor used in the RT9184 has an
inherent diode connected between each regulator
input and output (see Fig.1). If the output is forced
above the input by more than a diode-drop, this diode
will become forward biased and current will flow from
the V
OUT
terminal to V
IN
. This diode will also be
turned on by abruptly stepping the input voltage to a
value below the output voltage. To prevent regulator
mis-operation, a Schottky diode could be used in the
applications where input/output voltage conditions
can cause the internal diode to be turned on (see
Fig.2). As shown, the Schottky diode is connected in
parallel with the internal parasitic diode and prevents
it from being turned on by limiting the voltage drop
across it to about 0.3V < 100mA to prevent damaging
the part.
Fig. 1 V
OUT
Structure of RT9184
V
IN
V
OUT
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