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參數資料
| 型號： | RT9168-37CS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | B-Suffix Series CMOS Gates; Package: SOIC 14 LEAD; No of Pins: 14; Container: Tape and Reel; Qty per Container: 2500 |
| 中文描述： | 200毫安/ 500mA的固定輸出電壓LDO穩壓器 |
| 文件頁數： | 7/13頁 |
| 文件大小： | 236K |
| 代理商： | RT9168-37CS |
RT9168/A
DS9168/A-03 May 2001
www.richtek-ic.com.tw
7
Applications Guides
Capacitor Selection and Regulator Stability
Like any low-dropout regulator, the external capacitors
used with the RT9168/A must be carefully selected for
regulator stability and performance.
Using a capacitor whose value is > 1
μ
F on the
RT9168/A input and the amount of capacitance can be
increased without limit. The input capacitor must be
located 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 LDO
applications. The RT9168/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 1
μ
F with
ESR is > 5m
on the RT9168/A output ensures
stability. The RT9168/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 RT9168/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.
Load-Transient Considerations
The RT9168/A load-transient response graphs (see
Typical
Operating
Characteristics)
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.
show
two
capacitor’s
value
and
Shutdown Input Operation
The RT9168/A is shutdown by pulling the SHDN
input low, and turned on by driving the input high. If
this feature is not to be used, the SHDN input should
be tied to VIN to keep the regulator on at all times
(the SHDN input must
not
be left floating).
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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