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參數(shù)資料
| 型號(hào)： | RT9177-24CBR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 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 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 262K |
| 代理商： | RT9177-24CBR |
RT9177
Preliminary
www.richtek-ic.com.tw
8
DS9177-00 Feb. 2001
Fig. 2
Load-Transient Considerations
The RT9177 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 1mA to 100mA is
tens mV, depending on the ESR of the output
capacitor. Increasing the output capacitor’s value
and decreasing the ESR attenuates the overshoot.
show
two
Shutdown Input Operation
The RT9177 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).
To ensure proper operation, the signal source used to
drive the SHDN input must be able to swing above and
below the specified turn-on/turn-off voltage thresholds
which guarantee an ON or OFF state (see Electrical
Characteristics). The ON/OFF signal may come from
either CMOS output, or an open-collector output with
pull-up resistor to the RT9177 input voltage or another
logic supply. The high-level voltage may exceed the
RT9177 input voltage, but must remain within the
absolute maximum ratings for the SHDN pin.
Internal P-Channel Pass Transistor
The RT9177 features a typical 1.1
P-channel
MOSFET
pass
transistor.
advantages over similar designs using PNP pass
transistors, including longer battery life. The P-channel
MOSFET requires no base drive, which reduces
quiescent current considerably. PNP-based regulators
waste considerable current in dropout when the pass
transistor saturates. They also use high base-drive
currents under large loads. The RT9177 does not
suffer from these problems and consume only 80μA of
quiescent current whether in dropout, light-load, or
heavy-load applications.
It
provides
several
Input-Output (Dropout) Voltage
A
differential (or dropout voltage) determines the
lowest usable supply voltage. In battery-powered
systems, this will determine the useful end-of-life
battery voltage. Because the RT9177 uses a P-
channel MOSFET pass transistor, the dropout
voltage is a function of drain-to-source on-resistance
[R
ds
(on)
] multiplied by the load current.
regulator’s
minimum
input-output
voltage
Reverse Current Path
The power transistor used in the RT9177 has an
inherent diode connected between the regulator
input and output (see Fig.3). If the output is forced
above the input by more than a diode-drop, this
diode will become forward biased and current will
flow from the V
OUT
terminal to V
IN
. This diode will
also be turned on by abruptly stepping the input
voltage to a value below the output voltage. To
prevent regulator mis-operation, a Schottky diode
should be used in any applications where
input/output voltage conditions can cause the
internal diode to be turned on (see Fig.4). As shown,
the Schottky diode is connected in parallel with the
internal parasitic diode and prevents it from being
turned on by limiting the voltage drop across it to
about 0.3V. < 100 mA to prevent damage to the part.
T
T
T
1 >
2 >
C
B
= 470pF
10nF
2.2nF
V
IN
= 3.6V, C
IN
= 1
μ
F, C
OUT
= 4.7
μ
F
500
μ
S/Div
CH1: 2V/div; CH2 = V
OUT
, 500mV/div
CH1
CH2
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| RT9178-25GB | 功能描述:IC REG LDO 2.5V .2A 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: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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