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參數(shù)資料
| 型號(hào)： | RT9177-24CB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Ultra-Low-Noise 200mA LDO Regulator |
| 中文描述： | 超低噪聲200mA LDO穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 262K |
| 代理商： | RT9177-24CB |
Preliminary
RT9177
DS9177-00 Feb. 2001
www.richtek-ic.com.tw
7
Application Guides
Capacitor Selection and Regulator Stability
Like any low-dropout regulator, the external capacitors
used with the RT9177 must be carefully selected for
regulator stability and performance.
Using a capacitor whose value is >1
μ
F on the RT9177
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 RT9177 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 RT9177 output ensures stability.
The RT9177 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
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 RT9177 and returned to a clean
analog ground.
capacitor
of
larger
Note that some ceramic dielectrics exhibit large
capacitance and ESR variation with temperature. It
may be necessary to use 2.2μF or more to ensure
stability at temperatures below -10°C in this case. Also,
tantalum capacitors, 2.2μF 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
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| RT9177-24CBR | Ultra-Low-Noise 200mA LDO Regulator |
| RT9177-25CB | Ultra-Low-Noise 200mA LDO Regulator |
| RT9177-25CBR | Ultra-Low-Noise 200mA LDO Regulator |
| RT9177-26CB | Ultra-Low-Noise 200mA LDO Regulator |
| RT9177-26CBR | Ultra-Low-Noise 200mA LDO Regulator |
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|---|---|
| RT9178-25GB | 功能描述:IC REG LDO 2.5V .2A SOT23-5 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.1V 輸入電壓:最高 7.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:5A（最小值） 電流 - 限制（最小）:5.1A 工作溫度:-40°C ~ 100°C 安裝類(lèi)型:通孔 封裝/外殼:TO-220-5 供應(yīng)商設(shè)備封裝:TO-220-5 包裝:管件 配用:296-20624-ND - EVAL MOD FOR TPS72518 其它名稱:296-15154-5 |
| RT9178-26GB | 功能描述:IC REG LDO 2.6V .2A SOT23-5 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.1V 輸入電壓:最高 7.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:5A（最小值） 電流 - 限制（最?。?5.1A 工作溫度:-40°C ~ 100°C 安裝類(lèi)型:通孔 封裝/外殼:TO-220-5 供應(yīng)商設(shè)備封裝:TO-220-5 包裝:管件 配用:296-20624-ND - EVAL MOD FOR TPS72518 其它名稱:296-15154-5 |
| RT9178-28PB | 制造商:Richtek 功能描述:200mA LDO Regulator |
| RT9178-2HGB | 功能描述:IC REG LDO 2.85V .2A SOT23-5 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.1V 輸入電壓:最高 7.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:5A（最小值） 電流 - 限制（最小）:5.1A 工作溫度:-40°C ~ 100°C 安裝類(lèi)型:通孔 封裝/外殼:TO-220-5 供應(yīng)商設(shè)備封裝:TO-220-5 包裝:管件 配用:296-20624-ND - EVAL MOD FOR TPS72518 其它名稱:296-15154-5 |
| RT9178-30GB | 功能描述:IC REG LDO 3V .2A SOT23-5 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.1V 輸入電壓:最高 7.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:5A（最小值） 電流 - 限制（最小）:5.1A 工作溫度:-40°C ~ 100°C 安裝類(lèi)型:通孔 封裝/外殼:TO-220-5 供應(yīng)商設(shè)備封裝:TO-220-5 包裝:管件 配用:296-20624-ND - EVAL MOD FOR TPS72518 其它名稱:296-15154-5 |
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