RT9730 Datasheet, PDF (1/9 Pages) Richtek Technology Corporation – Charging System Safety Device

RT9730
Charging System Safety Device
General Description
The RT9730 is an integrated circuit (IC) designed to replace
passive device in charging system with extra protection
function. It is optimized to protect low voltage system
from up to 28V high voltage input. The IC monitors the
input voltage to make sure all parameters are operating in
normal range. It also monitors its own temperature and
turns off the MOSFET when the chip temperature exceeds
140°C. When the input voltage exceeds the threshold,
the IC turns off the power MOSFET within 1μs to remove
the power before any damage occurs. User can monitor
the adapter input voltage from the CHRIN pin, which has
50mA current capability. The gate of the P-MOSFET will
be controlled by the external charging controller from
GATDRV pin if all parameters are operating in normal
range.
The RT9730 is available in a WDFN-8L 2x2 tiny package
to achieve best solution for PCB space and total BOM
cost saving considerations.
Ordering Information
RT9730
Package Type
QW : WDFN-8L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z No External Blocking Diode Requiring
z Over Voltage Turn Off Time of Less Than 1μs
z High Accuracy Protection Thresholds
z Over Temperature Protection
z High Immunity of False Triggering Under Transients
z Thermal Enhanced 8-Lead WDFN Package
z RoHS Compliant and Halogen Free
Applications
z Cellular Phones
z Digital Cameras
z PDAs and Smart Phones
z Portable Instruments
Pin Configurations
(TOP VIEW)
ACIN 1
ACIN 2
GND 3
NC ⁴
8 OUT
7 OUT
6 CHRIN
9 _{5 GATDRV}
WDFN-8L 2x2
Marking Information
JF=W
JF= : Product Code
W : Date Code
Typical Application Circuit
RT9730
V_IN
ACIN CHRIN
C_IN
1µF
GATDRV
OUT
GND
DS9730-01 April 2011
C_OUT
1µF
SOC
CHRIN
GATEDRV
OUT
0.2
1µF
VBAT
Battery
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