RT9726 Datasheet, PDF (1/8 Pages) Richtek Technology Corporation – High-Voltage Hysteresis Selectable Temperature Switch

RT9726
High-Voltage Hysteresis Selectable Temperature Switch
General Description
The RT9726 is a temperature switch with wide input voltage
range. The over-temperature threshold point is generated
by a negative temperature coefficient (NTC) thermistor and
a setting resistor. The RT9726 provides an active-low, open-
drain logic output. OT goes LOW when the NTC pin voltage
is lower than 50% of the REF voltage threshold. The
RT9726 provides the selectable hysteresis mode that can
be set by the EN pin Input voltage. The IC is available in
SC-70-6 package.
Ordering Information
RT9726
Package Type
U6 : SC-70-6
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.
Marking Information
Features
z Wide Input Voltage Range : 4.75V to 25V
z 0.5μA Shutdown Current
z 2 Selectable Hysteresis Threshold
z Reference Output for Thermal Threshold Setting
z Open-drain Logic Output
z RoHS Compliant and Halogen Free
Applications
z Notebook Temperature Monitoring
z Microprocessor Thermal Management
z Temperature Control
z Fan Control
z Electronic System Protection
Pin Configurations
(TOP VIEW)
EN REF OT
6
5
4
23
VIN GND NTC
SC-70-6
A1=W
A1= : Product Code
W : Date code
Typical Application Circuit
5V
100k
V_IN
4.75V to 25V
Chip Enable
3.3V
1 _VIN
OT ⁴
C1
0.1µF
6
RT9726
REF ⁵
EN
2 _GND
NTC ³
System
SHDN#
R1
570
Thermistor
ß = 4250
10k
System shutdown switch @ Temp = 100°C
for default hysteresis 30°C
DS9726-01 April 2011
www.richtek.com
1