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參數(shù)資料
| 型號(hào)： | RT9169 |
| 英文描述： | Ultra Low Quiescent Current |
| 中文描述： | 超低靜態(tài)電流 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 254K |
| 代理商： | RT9169 |
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RT9166/A
Preliminary
www.richtek.com
10
DS9166A-03 July 2003
THERMAL CONSIDERATIONS
The RT9166/A series can deliver a current of up to
300/500mA over the full operating junction temp-
erature range. However, the maximum output current
must be derated at higher ambient temperature to
ensure the junction temperature does not exceed
125
°
C. With all possible conditions, the junction
temperature must be within the range specified under
operating conditions. Power dissipation can be
calculated based on the output current and the
voltage drop across regulator.
P
D
= (V
IN
– V
OUT
) I
OUT
+ V
IN
I
GND
The final operating junction temperature for any set
of conditions can be estimated by the following
thermal equation:
P
D (MAX)
= ( T
J (MAX)
T
A
) /
θ
JA
Where T
J (MAX)
is the maximum junction temperature
of the die (125
°
C) and T
A
is the maximum ambient
temperature. The junction to ambient thermal
resistance (
θ
JA
)
for SOT-23 package at recomm-
ended minimum footprint is 250
°
C/W, 180
°
C/W for
SOT-89 package, 60
°
C/W for SOT-223 package (
θ
JA
is layout dependent), and 160
°
C/W for TO-92
package. Visit our website in which “Recommended
Footprints for Soldering Surface Mount Packages” for
detail.
PCB LAYOUT
Good board layout practices must be used or
instability can be induced because of ground loops
and voltage drops. The input and output capacitors
MUST
be directly connected to the input, output, and
ground pins of the device using traces which have no
other currents flowing through them.
The best way to do this is to layout C
IN
and C
OUT
near
the device with short traces to the V
IN
, V
OUT
, and
ground pins. The regulator ground pin should be
connected to the external circuit ground so that the
regulator and its capacitors have a “single point
ground”.
It should be noted that stability problems have been
seen in applications where “vias” to an internal
ground plane were used at the ground points of the
device and the input and output capacitors. This was
caused by varying ground potentials at these nodes
resulting from current flowing through the ground
plane. Using a single point ground technique for the
regulator and it’s capacitors fixed the problem. Since
high current flows through the traces going into V
IN
and coming from V
OUT
, Kelvin connect the capacitor
leads to these pins so there is no voltage drop in
series with the input and output capacitors.
Optimum performance can only be achieved when
the device is mounted on a PC board according to
the diagram below:
SOT-23 Board Layout
IN
GND
VOUT
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| RT9182B | SHDN.Fast Transient Response |
| RT9182C | SHDN.Fast Transient Response |
| RT9183 | EN. Ultra Low Dropout |
| RT9184A | Fast Transient Response |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RT9169-12GB | 功能描述:IC REG LDO 1.2V .1A 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:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.08V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:LP3988IMFX-3.3 |
| RT9169-12GV | 功能描述:IC REG LDO 1.2V .1A SOT23-3 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:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.08V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:LP3988IMFX-3.3 |
| RT9169-12GVL | 功能描述:IC REG LDO 1.2V .1A S0T23-3 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:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.08V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:LP3988IMFX-3.3 |
| RT9169-13GV | 功能描述:IC REG LDO 1.3V .1A SOT23-3 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:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.08V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:LP3988IMFX-3.3 |
| RT9169-13GVL | 功能描述:IC REG LDO 1.3V .1A SOT23-3 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:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.08V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:LP3988IMFX-3.3 |
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