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CS2001/D

更新时间： 2024-11-27 23:43:35
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其他 - ETC 稳压器开关
页数 文件大小 规格书
8页 77K
描述
1.2A Switching Regulator， and 5.0 V 100mA Linear Regulator with RESETbar

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CS2001/D 数据手册

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CS2001  
1.2 A Switching Regulator,  
and 5.0 V, 100 mA Linear  
Regulator with RESET  
The CS2001 is a smart power supply ASIC utilized in automotive  
airbag systems. It contains a current–mode switching regulator with a  
1.2 A on–chip switch and a 5.0 V, 100 mA linear regulator. The linear  
output capacitor must be 3.3 µF or greater with an ESR in the range of  
100 mΩ to 1.0 Ω. If the ESR of the cap is less than 100 mΩ, a series  
resistor must be used. The switcher can be configured in either a boost  
or flyback topology. The boost topology produces energy reserve  
voltage VER which is externally adjustable (25 V maximum) through  
http://onsemi.com  
SO–20L  
DWF SUFFIX  
CASE 751D  
20  
1
MARKING DIAGRAM  
the resistor divider connected to the V pin. In the event of fault  
FB  
conditions that produce V either open or shorted, the switcher is  
20  
FB  
shut down.  
Under normal operating conditions (V  
CS2001  
> 8.0 V), the current  
BAT  
AWLYYWW  
loading on the linear regulator is directed through V . A low battery  
BAT  
or loss of battery condition switches the supply for the linear regulator  
from V  
to VER and shuts down the switcher using the ASIC’s  
1
BAT  
internal “smartswitch.” This switchover feature minimizes the power  
dissipation in both the linear and switcher output devices and saves the  
cost of using a larger inductor.  
A
= Assembly Location  
WL, L = Wafer Lot  
YY, Y = Year  
WW, W = Work Week  
The NERD (No Energy Reserve Detected) pin is a dual function  
output. If V  
is not in regulation, it provides a Power On Reset  
OUT  
function whose time interval is externally adjustable with the  
capacitor. This interval can be seen on the RESETB pin, which allows  
for clean power–up and power–down of the microprocessor. Once  
PIN CONNECTIONS  
1
20  
VER  
V
OUT  
V
OUT  
is in regulation, the logic level of the NERD output (usually  
V
V
GND1  
GND2  
GND3  
GND4  
RESETB  
NERD  
GND8  
GND7  
GND6  
GND5  
BAT  
low) indicates to the microprocessor whether or not the VER pin is  
connected.  
A switched–capacitor voltage tripler accepts input voltage VER and  
FB  
produces output voltage V  
(typically VER + 8.0 V). This voltage  
CHG  
is used in the system to drive high–side FETs.  
This part is capable of withstanding a 50 V peak transient voltage.  
The linear regulator will not shut down during this event.  
V
V
SW  
CHG  
I
BIAS  
SWSD  
COMP  
C
PUMP  
Features  
ORDERING INFORMATION  
• Linear Regulator 5.0 V ±2% @ 100 mA  
• Switching Regulator 1.2 A Peak Internal Switch  
• Voltage Tripler  
• Smart Functions  
Device  
Package  
Shipping  
37 Units/Rail  
CS2001YDWF20  
CS2001YDWFR20  
SO–20L  
SO–20L  
1000 Tape & Reel  
– Smartswitch  
– RESET  
– Energy Reserve Status  
• Protection  
– Overtemperature  
– Current Limit  
– 50 V Peak Transient Capability  
• Internally Fused Leads in SO–20L Package  
Semiconductor Components Industries, LLC, 2001  
1
Publication Order Number:  
December, 2000 – Rev. 5  
CS2001/D  
12345678

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