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參數(shù)資料
| 型號(hào)： | RT9188-K8GB |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Dual, Ultra-Low Quiescent, 100mA CMOS LDO Regulator |
| 中文描述： | 雙路，超低靜態(tài)，100mA的LDO穩(wěn)壓器的CMOS |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 168K |
| 代理商： | RT9188-K8GB |
RT9188
Preliminary
7
DS9188-08 March 2007
www.richtek.com
Application Information
Like any low-dropout regulator, the RT9188 requires input
and output decoupling capacitors. The device is
specifically designed for portable applications requiring
minimum board space and smallest components. These
capacitors must be correctly selected for good
performance (see Capacitor Characteristics Section).
Please note that linear regulators with a low dropout
voltage have high internal loop gains which require care
in guarding against oscillation caused by insufficient
decoupling capacitance.
Input Capacitor
An input capacitance of
1
μ
F is required between the
device input pin and ground directly (the amount of the
capacitance may be increased without limit). The input
capacitor
MUST
be located less than 1 cm from the device
to assure input stability (see PCB Layout Section). A lower
ESR capacitor allows the use of less capacitance, while
higher ESR type (like aluminum electrolytic) require more
capacitance.
Capacitor types (aluminum, ceramic and tantalum) can
be mixed in parallel, but the total equivalent input
capacitance/ESR must be defined as above to stable
operation.
There are no requirements for the ESR on the input
capacitor, but tolerance and temperature coefficient must
be considered when selecting the capacitor to ensure
the capacitance will be
1
μ
F over the entire operating
temperature range.
Output Capacitor
The RT9188 is designed specifically to work with very
small ceramic output capacitors. The recommended
minimum capacitance (temperature characteristics X7R
or X5R) in 1
μ
F to 4.7
μ
F range with 10m
to 50m
range
ceramic capacitor between LDO output and GND for
transient stability, but it may be increased without limit.
Higher capacitance values help to improve transient.
The output capacitor's ESR is critical because it forms a
zero to provide phase lead which is required for loop
stability.
No Load Stability
The device will remain stable and in regulation with no
external load. This is specially important in CMOS RAM
keep-alive applications.
Input-Output (Dropout) Voltage
A regulator's minimum input-to-output voltage differential
(dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines the
useful end-of-life battery voltage. Because the device
uses a PMOS, its dropout voltage is a function of drain-
to-source on-resistance, R
DS(ON)
, multiplied by the load
current:
V
DROPOUT
= V
DD
V
OUT
= R
DS(ON)
×
I
OUT
Current Limit
The RT9188 monitors and controls the PMOS
’
gate
voltage, limiting the output current to 450mA (typ). The
output can be shorted to ground for an indefinite period
of time without damaging the part.
Short-Circuit Protection
The device is short circuit protected and in the event of a
peak over-current condition, the short-circuit control loop
will rapidly drive the output PMOS pass element off. Once
the power pass element shuts down, the control loop will
rapidly cycle the output on and off until the average power
dissipation causes the thermal shutdown circuit to
respond to servo the on/off cycling to a lower frequency.
Please refer to the section on thermal information for
power dissipation calculations.
Capacitor Characteristics
It is important to note that capacitance tolerance and
variation with temperature must be taken into
consideration when selecting a capacitor so that the
minimum required amount of capacitance is provided over
the full operating temperature range. In general, a good
tantalum capacitor will show very little capacitance
variation with temperature, but a ceramic may not be as
good (depending on dielectric type).
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PDF描述 |
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| RT9188-K8PB | Dual, Ultra-Low Quiescent, 100mA CMOS LDO Regulator |
| RT9193-15PB | 300mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator |
| RT9193 | 300mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator |
| RT9193-15GB | 300mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator |
| RT9193-15GQW | 300mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RT9193-15GB | 功能描述:IC REG LDO 1.5V .3A SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.5V 輸入電壓:2.5 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:300mA（最小值） 電流 - 限制（最小）:360mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) |
| RT9193-15GU5 | 功能描述:IC REG LDO 1.5V .3A SC70-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.5V 輸入電壓:2.5 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:300mA（最小值） 電流 - 限制（最?。?360mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) |
| RT9193-15PB | 制造商:Richtek Technology Corporation 功能描述: |
| RT9193-16GB | 功能描述:IC REG LDO 1.6V .3A SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.5V 輸入電壓:2.5 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:300mA（最小值） 電流 - 限制（最?。?360mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) |
| RT9193-18GB | 功能描述:IC REG LDO 1.8V .3A SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 其它有關(guān)文件:LM317M View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，可調(diào)式 輸出電壓:1.2 V ~ 37 V 輸入電壓:- 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:500mA 電流 - 限制（最?。?500mA 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-252-3，DPak（2 引線+接片），SC-63 供應(yīng)商設(shè)備封裝:D-Pak 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1190 (CN2011-ZH PDF) 其它名稱:497-1574-1 |
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