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參數(shù)資料
| 型號： | RT9167A-26CS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | LOW NOISE FIXED OUTPUT VOLTAGE 200MA/500MA LDO REGULATOR |
| 中文描述： | 低噪聲固定輸出電壓200MA/500MA LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 257K |
| 代理商： | RT9167A-26CS |
RT9167/A
www.richtek-ic.com.tw
8
DS9167/A-10 July 2001
Applications Guides
Capacitor Selection and Regulator Stability
Like any low-dropout regulator, the external capacitors
used with the RT9167/A must be carefully selected for
regulator stability and performance.
Using a capacitor whose value is > 1
μ
F on the
RT9167/A 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 to 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 output capacitor must meet both requirements for
minimum amount of capacitance and ESR in all LDOs
application. The RT9167/A is designed specifically to
work with low ESR ceramic output capacitor in space-
saving and performance consideration. Using a
ceramic capacitor whose value is at least 1uF with
ESR is > 5m
on the RT9167/A output ensures
stability. The RT9167/A still works well with output
capacitor of other types due to the wide stable ESR
range. Fig.1 shows the curves of allowable ESR range
as a function of load current for various output
voltages and capacitor values. 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 RT9167/A and returned
to a clean analog ground.
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 application by the manufacture.
Use a 10nF bypass capacitor at BP for low output
voltage noise. The capacitor, in conjunction with an
internal 200K
resistor, which connects bypass pin
and the band-gap reference, creates an 80Hz low-
pass filter for noise reduction. Increasing the
capacitance will slightly decrease the output noise,
but increase the start-up time. The capacitor
connected to the bypass pin for noise reduction must
have very low leakage. This capacitor leakage
current causes the output voltage to decline by a
proportional amount to the current due to the voltage
drop on the internal 200K
resistor. Fig. 2 shows the
power on response.
Fig. 1
C
OUT
= 4.7
μ
F
C
OUT
= 1
μ
F
C
O
Region of Stable C
OUT
ESR vs. Load Current
100
0 40 80 120 160 200
Load Current (mA)
0.001
0.01
0.1
1
10
(
)
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