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CS2001 Datasheet

100 mA Linear Regulator

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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 mto 1.0 . If the ESR of the cap is less than 100 m, 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
the resistor divider connected to the VFB pin. In the event of fault
conditions that produce VFB either open or shorted, the switcher is
shut down.
Under normal operating conditions (VBAT > 8.0 V), the current
loading on the linear regulator is directed through VBAT. A low battery
or loss of battery condition switches the supply for the linear regulator
from VBAT to VER and shuts down the switcher using the ASIC’s
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.
The NERD (No Energy Reserve Detected) pin is a dual function
output. If VOUT is not in regulation, it provides a Power On Reset
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
VOUT is in regulation, the logic level of the NERD output (usually
low) indicates to the microprocessor whether or not the VER pin is
connected.
A switched–capacitor voltage tripler accepts input voltage VER and
produces output voltage VCHG (typically VER + 8.0 V). This voltage
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.
Features
Linear Regulator 5.0 V ±2% @ 100 mA
Switching Regulator 1.2 A Peak Internal Switch
Voltage Tripler
Smart Functions
Smartswitch
RESET
Energy Reserve Status
Protection
Overtemperature
Current Limit
50 V Peak Transient Capability
Internally Fused Leads in SO–20L Package
http://onsemi.com
20
1
SO–20L
DWF SUFFIX
CASE 751D
MARKING DIAGRAM
20
CS2001
AWLYYWW
1
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
1
VER
VBAT
VFB
GND1
GND2
GND3
GND4
VSW
SWSD
COMP
20
VOUT
RESETB
NERD
GND8
GND7
GND6
GND5
VCHG
IBIAS
CPUMP
ORDERING INFORMATION
Device
Package
Shipping
CS2001YDWF20 SO–20L 37 Units/Rail
CS2001YDWFR20 SO–20L 1000 Tape & Reel
© Semiconductor Components Industries, LLC, 2001
December, 2000 – Rev. 5
1
Publication Order Number:
CS2001/D


  ON Semiconductor Electronic Components Datasheet  

CS2001 Datasheet

100 mA Linear Regulator

No Preview Available !

CS2001
68 µH
100 µF
Microprocessor
1.0 k
95.3 k
Reserve
Firing
Voltage
VIGN
1000 µF
5.1 k
11 k
1000 µF 1.0 µF
VER
VBAT
VFB
GND1
VOUT
RESETB
NERD
GND8
GND2
GND7
CS2001
GND3
GND6
GND4
VSW
SWSD
COMP
GND5
VCHG
IBIAS
CPUMP
0.1 µF
270 pF
ESR
Tripler
Firing
Voltage
30.1 k
10 µF
1.0 µF 0.47 µF
Figure 1. Application Diagram
ABSOLUTE MAXIMUM RATINGS*
Rating
VBAT
VER
VOUT
Digital Input/Output Voltage
Peak Transient Voltage (36 V Load Dump @ 14 V Battery Voltage)
Storage Temperature Range
Junction to Free Air Thermal Impedance
ESD Susceptibility (Human Body Model)
Lead Temperature Soldering:
TA
TJ
1. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
Reflow: (SMD styles only) (Note 1.)
Value
–0.5 to 25
–0.5 to 25
–0.5 to 7.0
–0.5 to 7.0
50
–55 to 150
55
4.0
230 peak
–40 to 85
–40 to 150
Unit
V
V
V
V
V
°C
°C/W
kV
°C
°C
°C
http://onsemi.com
2


Part Number CS2001
Description 100 mA Linear Regulator
Maker ON Semiconductor
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CS2001 Datasheet PDF






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