參數(shù)資料
型號(hào)： CS2001YDWF20
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHED CAPACITOR REGULATOR, 165 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 0.300 INCH, SO-20
文件頁(yè)數(shù)： 1/5頁(yè)
文件大?。?/td> 138K
代理商： CS2001YDWF20
s
Linear Regulator
5V ±2% @ 100mA
s
Switching Regulator
1.2A Peak Internal Switch
s
Voltage Tripler
s
Smart Functions
Smartswitch
RESET
Energy Reserve Status
s
Protection
Overtemperature
Current Limit
50V Peak Transient
Capability
Package Options
CS2001
1.2A Switching Regulator,
and 5V, 100mA Linear Regulator with RESET
CS2001
Application Diagram
20 Lead SO Wide
(internally fused leads)
1
Rev. 1/27/00
1
VOUT
RESETB
NERD
Gnd1
Gnd2
Gnd3
Gnd4
Gnd6
Gnd5
Gnd8
Gnd7
VCHG
IBIAS
CPUMP
COMP
SWSD
VSW
VER
VBAT
VFB
Features
Description
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A
Company
The CS2001 is a smart power supply
ASIC utilized in automotive airbag
systems. It contains a current-mode
switching regulator with a 1.2A on-
chip switch and a 5V, 100mA linear
regulator. The linear output capacitor
must be 3.3F or greater with an ESR
in the range of 100m to 1. If the
ESR of the cap is less than 100m, a
series resistor must be used. The
switcher can be configured in either a
boost or flyback topology. The boost
topology (shown below) produces
energy reserve voltage VER which is
externally adjustable (25V 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 > 8V), 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 pro-
duces output voltage VCHG (typically
VER +8V). This voltage is used in the
system to drive high-side FETS.
This part is capable of withstanding a
50V peak transient voltage. The linear
regulator will not shut down during
this event.
Tripler
Firing
Voltage
CS2001
VOUT
RESETB
NERD
Gnd1
Gnd2
Gnd3
Gnd4
Gnd6
Gnd5
Gnd8
Gnd7
VCHG
IBIAS
CPUMP
COMP
SWSD
VSW
VER
VBAT
VFB
Reserve
Firing
Voltage
68H
1k
95.3k
5.1k
VIGN
1000F
1F
11k
0.1F
270pF
30.1k
1F
0.47F10F
Microprocessor
ESR
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