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參數資料
| 型號： | RT9194 |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Low-Dropout Linear Regulator Controller with PGOOD Indication |
| 中文描述： | 低壓差線性穩(wěn)壓器控制器PGOOD指示 |
| 文件頁數： | 8/10頁 |
| 文件大小： | 232K |
| 代理商： | RT9194 |
RT9194
8
DS9194-08 March 2007
www.richtek.com
Capacitors Selection
Careful selection of the external capacitors for RT9194 is
highly recommended in order to remain high stability and
performance.
Regarding the supply voltage capacitor, connecting a
capacitor which is 1
μ
F between V
CC
and ground is a must.
The capacitor improves the supply voltage stability to
provide chip normally operating.
Regarding the input capacitor, connecting a capacitor which
100
μ
F between V
IN
and ground is recommended to
increase stability. With large value of capacitance could
result in better performance for both PSRR and line
transient response.
When driving external pass element, connecting a
capacitor 100
μ
F between V
OUT
and ground is
recommended for stability. With larger capacitance can
reduce noise and improve load transient response and
PSRR.
Output Voltage Setting
The RT9194 develop a 0.8V reference voltage; especially
suit for low voltage application. As shown in application
circuit, the output voltage could easy set the output
voltage by R1 & R2 divider resistor.
Power Good Function
The RT9194 has the power good function with delay. The
power good output is an open drain output. Connect a
100k
Ω
pull up resistor to V
OUT
to obtain an output voltage.
When the output voltage arrive 90% of normal value the
power good will output voltage with 3ms delay time.
When the output voltage falling arrive 75% of normal value
the power good will turn off with less than 1ms delay time.
But, there are two exceptions. One is the enable pull low
the power good will turn off quickly. The second is the
V
CC
falling arrive POR value (4V typ.) the power good
also will turn off quickly.
Chip Enable Operation
Pull the EN pin low to drive the device into shutdown mode.
During shutdown mode, the standby current drops to
5
μ
A
(MAX)
. The external capacitor and load current determine
the output voltage decay rate. Drive the EN pin high to
turn on the device again.
Under Voltage Protection
RT9194 equips the V
OUT
under-voltage (UV) protection
function. The UV protection circuits will start monitoring
the power status after the PGOOD pin goes high. If the
output voltage drops to below 75% of its setting value,
the PGOOD and DRI pins will be pulled low and latch
RT9194. The UV latch status will be released only when
V
CC
or Enable pin goes low and returns high again, which
will also cause RT9194 to re-activate.
MOSFET Selection
The RT9194 are designed to driver external N-Channel
MOSFET pass element. MOSFET selection criteria
include threshold voltage V
GS
(V
TH
), maximum
continuous drain current ID, on-resistance R
DS(ON)
,maximum drain-to-source voltage V
DS
and package
thermal resistance
θ
(JA)
.
The most critical specification is the MOSFET R
DS(ON).
Calculate the required R
DS(ON)
from the following formula:
IN
DS(ON)
I
For example, the MOSFET operate up to 2A when the
input voltage is 1.5V and set the output voltage is 1.2V,
R
ON
= (1.5V-1.2V) / 2A = 150m
Ω
, the MOSFET's
R
ON
have to select lower than 150m
Ω
. A Philip PHD3055E
MOSFET with an R
DS(ON)
of 120m
Ω
(typ.) is a close
match.
And carry on consider the thermal resistance from
junction to ambient
θ
(JA)
of the MOSFET's package. The
power dissipation calculate by :
P
D
= (V
IN
V
OUT
) x I
LOAD
The thermal resistance from junction to ambient
θ
(JA)
calculate by :
J
(JA)
P
In this example, P
D
= (1.5V
1.2V) x 2A = 0.6W. The
PHD3055E's
θ
(JA)
is 75
°
C/W for its D-PAK package, which
translates to a 45
°
C temperature rise above ambient. The
package provides exposed backsides that directly transfer
heat to the PCB board.
D
A
)
T
(T
=
θ
LOAD
OUT
V
V
R
NMOSFET
=
Application Information
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相關代理商/技術參數 |
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| RT9194GE | 功能描述:IC REG CTRLR SGL POS ADJ SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅動器 系列:- 產品培訓模塊:More Information on LDOs 標準包裝:2,500 系列:- 類型:正，固定式 輸出數:2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| RT9194PE | 制造商:Richtek 功能描述:LDO |
| RT9198-15GBG | 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:- 標準包裝:1 系列:anyCAP® 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標準）:0.23V @ 1.5A 穩(wěn)壓器數量:1 電流 - 輸出:1.5A 電流 - 限制（最?。?- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:TO-261-4，TO-261AA 供應商設備封裝:SOT-223-3 包裝:Digi-Reel® 其它名稱:ADP3339AKCZ-3.3-RLDKR |
| RT9198-15GBR | 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:- 標準包裝:1 系列:anyCAP® 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標準）:0.23V @ 1.5A 穩(wěn)壓器數量:1 電流 - 輸出:1.5A 電流 - 限制（最?。?- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:TO-261-4，TO-261AA 供應商設備封裝:SOT-223-3 包裝:Digi-Reel® 其它名稱:ADP3339AKCZ-3.3-RLDKR |
| RT9198-15GU5 | 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:- 標準包裝:1 系列:anyCAP® 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標準）:0.23V @ 1.5A 穩(wěn)壓器數量:1 電流 - 輸出:1.5A 電流 - 限制（最小）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:TO-261-4，TO-261AA 供應商設備封裝:SOT-223-3 包裝:Digi-Reel® 其它名稱:ADP3339AKCZ-3.3-RLDKR |
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