- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366903 > CS5233-3GDFR8 THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS PDF資料下載
參數(shù)資料
| 型號： | CS5233-3GDFR8 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| 中文描述： | 三端固定電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 95K |
| 代理商： | CS5233-3GDFR8 |
CS5233–3
http://onsemi.com
7
APPLICATIONS INFORMATION
INPUT AND OUTPUT VOLTAGE MATRIX
Input
Outputs
V
IN
áááá
áááá
SB
3.3 V
AUX
áááááááá
áááááááá
V
OUT
, 5 Lead D
2
PAK
áááááááá
REG
OUT
0 V
áááá
0 V
áááááááá
0 V
áááááááá
0 V
áááá
3.3 V
áááááááá
3.3 V
AUX
áááááááá
AUX
0 V
áááá
0 V
áááááááá
3.3 V
REG
@ 500 mA
áááááááá
REG
0 V
áááá
3.3 V
áááááááá
3.3 V
REG
@ 500 mA
áááááááá
REG
5.0 V
áááá
0 V
áááááááá
3.3 V
REG
@ 1.5 A
áááááááá
REG
5.0 V
áááá
3.3 V
áááááááá
3.3 V
REG
@ 1.5 A
áááááááá
REG
5.0 V
0 V
3.3 V
REG
@ 1.5 A
5.0 V
áááá
áááá
3.3 V
áááááááá
áááááááá
3.3 V
REG
@ 1.5 A
áááááááá
áááááááá
REG
THEORY OF OPERATION
Linear Regulator
The CS5233–3 is a dual input fixed 3.3 V linear regulator
that contains an auxiliary drive control feature. When V
IN
alone is present, or V
IN
and V
SB
are simultaneously present,
the CS5233–3 uses the V
IN
supply to generate the 3.3 V
output at currents of up to 1.5 A. When V
SB
alone is present,
the CS5233–3 uses the V
SB
supply to generate the 3.3 V
output at currents of up to 500 mA. The linear regulator is
composed of a composite PNP–NPN pass transistor to
provide low–voltage dropout capability. An output capacitor
greater than 10
μ
F with equivalent series resistance (ESR)
less than 1.0
is required for compensation. More
information is provided in the Stability Considerations
section.
Auxiliary Drive Feature
The CS5233–3 provides an auxiliary drive feature that
allows a load to remain powered even if both supplies to the
IC are absent. An external p–channel FET is the only
additional component required to implement this function
when the auxiliary power supply is available. The PFET gate
is connected to the IC’s AuxDrv output, the PFET drain is
connected to the auxiliary power supply, and the PFET
source is connected to the load. The polarity of this
connection is very important, since the PFET body diode
will be connected between the load and the auxiliary supply.
If the PFET is connected with its drain to the load and its
source to the supply, the body diode could be
forward–biased if the auxiliary supply is not present. This
would result in the linear regulator providing current to
everything on the auxiliary supply rail.
The AuxDrv (5.0 V detect) output is pulled up to the input
voltage through an internal resistor when V
IN
or V
SB
are
available. If V
IN
and V
SB
are not available or both drop
below 4.4 V, the AuxDrv output goes low, turning on an
external PFET that connects the 3.3 V auxiliary supply to the
load. The AuxDrv is low only when neither V
IN
nor V
SB
are
available.
There is 100 mV of hysteresis (typical) in the circuitry that
determines if V
IN
or V
SB
are present.
STABILITY CONSIDERATIONS
The output capacitor helps determine three main
characteristics of a linear regulator: loop stability, load
transient response, and start–up delay. The CS5233–3 is
designed to be stable with an output capacitor that has a
minimum value of 10
μ
F and an equivalent series resistance
less than 1.0
. To guarantee loop stability, the output
capacitor should be located close to the regulator output and
ground pins. The load transient response, during the time it
takes the regulator to respond, is also determined by the
output capacitor. For large changes in load current, the ESR
of the output capacitor causes an immediate drop in output
voltage given by:
V
I
ESR
There is then an additional drop in output voltage given
by:
V
I
T C
where T is the time for the regulation loop to begin to
respond, (typically 4.0
μ
s for the CS5233–3). If tight output
regulation is required with fast changing loads, a capacitor
network of tantalum and low ESR ceramic capacitors can be
added as close to the load as possible, with enough
capacitance and a reduced ESR to minimize the voltage
change, as determined by the formulas above.
Input Capacitors and the Vin Thresholds
A capacitor placed on the V
IN
pin will help to improve
transient response. During a load transient, the input
capacitor serves as a charge “reservoir,” providing the
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CS5233-3GDP5 | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| CS5233-3GDPR5 | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| CS5317-TD | Analog-to-Digital Converter， 16-Bit |
| CS5317-BD | Analog-to-Digital Converter， 16-Bit |
| CS5320KL | Converter IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS5233-3GDP5 | 制造商:ON Semiconductor 功能描述:500 mA and 1.5 A, 3.3 V Dual Input Linear Regulator with Auxiliary Control |
| CS5233-3GDPR5 | 功能描述:IC REG LDO 3.3V 1.5A D2PAK-5 RoHS:否 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，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱:497-3576-5 |
| CS5234-000 | 制造商:TE Connectivity 功能描述:EPD-RWC-21838 - Cable Rools/Shrink Tubing |
| CS5236-000 | 制造商:TE Connectivity 功能描述:EPD-RWC-21836 - Cable Rools/Shrink Tubing |
| CS5238-000 | 制造商:TE Connectivity 功能描述:EPD-RWC-21825 - Cable Rools/Shrink Tubing |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。