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RT9554A Fiches technique(PDF) 2 Page - Richtek Technology Corporation

No de pièce RT9554A
Description  Battery Output Current Sense Protection IC
Download  10 Pages
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Fabricant  RICHTEK [Richtek Technology Corporation]
Site Internet  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9554A Fiches technique(HTML) 2 Page - Richtek Technology Corporation

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RT9554A
2
DS9554A-00
June 2014
www.richtek.com
©
Copyright
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
Function Block Diagram
Operation
The RT9554A consists of one current sensing amplifier
and one comparator, and it provides the following
functions : over-current protection and voltage comparison
between AC_REAL and AC_REF. Users can connect one
resistor between the FLAG pin and supply voltage. Either
over-current condition or the occurs AC_REAL voltage is
larger than AC_REF, the FLAG pin is pulled low.
Over Current Protection
With 1m
Ω order of resistor shunts between CSP and CSN,
the current sensing amplifier amplifies the voltage between
CSP and CSN by 200 and compares the result with the
BAT_REF voltage. If the output voltage of current sensing
amplifier is larger than the BAT_REF voltage, the FLAG
pin is pulled low.
AC_REAL & AC_REF Comparison
A comparator is designed for the voltage comparison
between AC_REAL and AC_REF. If the voltage of
AC_REAL is larger than AC_REF, the FLAG pin is pulled
low.
POR
GND
Comparator
+
-
+
-
Comparator
+
-
VRON
AC_REAL
BAT_REF
CSN
CSP
VCC
EN
x 200
FLAG
AC_REF
Pin No.
Pin Name
Pin Function
1
VCC
Power Supply Input. Connect this pin to 5V and place a minimum 0.1
F
decoupling capacitor .The decoupling capacitor should be placed to this pin
as close as possible.
2
EN
Enable Control Input.
3
FLAG
Open-Drain Output. Connected to an external resistor. When over-current
occurs, this pin will be pulled low.
4
AC_REF
Comparator Inverting Input.
5
AC_REAL
Comparator Non-Inverting Input.
6
BAT_REF
Over-Current Threshold Setting. It is used to set over-current threshold from
0.4V to 2V.
7
CSN
Negative Current Sense Input.
8
CSP
Positive Current Sense Input.
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation


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