sm72485sdx National Semiconductor Corporation, sm72485sdx Datasheet - Page 4

• Manufacturer Part Number: sm72485sdx
• Description: Solarmagic 100v, 150 Ma Constant On-time Buck Switching Regulator
• Manufacturer: National Semiconductor Corporation

www.national.com
Minimum Off Time
Regulation and OV Comparators
Thermal Shutdown
Tsd
Thermal Resistance
θ
JA
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: For detailed information on soldering plastic MSOP and LLP packages, refer to the Packaging Data Book available from National Semiconductor
Corporation.
Note 3: All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with T
limits are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
Note 4: The V
Note 5: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. The ESD rating for pin 2, pin 7, and pin 8 is 1 kV for HBM
and 150V for MM.
Note 6: For devices procured in the LLP-8 package the Rds(on) limits are guaranteed by design characterization data only.
Symbol
CC
Minimum Off Timer
FB Reference Threshold
FB Over-Voltage Threshold
FB Bias Current
Thermal Shutdown Temp.
Thermal Shutdown Hysteresis
Junction to Ambient
output is intended as a self bias for the internal gate drive power and control circuits. Device thermal limitations limit external loading.
Parameter
FB = 0V
Internal reference
Trip point for switch ON
Trip point for switch OFF
SDC Package
MUA Package
Conditions
4
2.445
Min
2.875
Typ
300
100
165
200
2.5
25
40
A
= T
2.550
Max
J
= 25°C. All hot and cold
Units
°C/W
nA
ns
°C
°C
V
V