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SM72485 Datasheet, PDF (3/16 Pages) National Semiconductor (TI) – SolarMagic 100V, 150 mA Constant On-Time Buck Switching Regulator
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
BST to GND
SW to GND (Steady State)
ESD Rating (Note 5)
Human Body Model
BST to VCC
-0.3V to 100V
-0.3V to 114V
-1V
2kV
100V
BST to SW
VCC to GND
All Other Inputs to GND
Lead Temperature (Soldering 4 sec)
Storage Temperature Range
14V
14V
-0.3 to 7V
260°C
-55°C to +150°C
Operating Ratings (Note 1)
VIN
Operating Junction Temperature
6V to 95V
−40°C to + 125°C
Electrical Characteristics Specifications with standard typeface are for TJ = 25°C, and those with boldface type
apply over full Operating Junction Temperature range. VIN = 48V, unless otherwise stated (Note 3).
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VCC Supply
Vcc Reg
Vcc Regulator Output
Vin = 48V
6.6
7
7.4
V
Vin – Vcc
6V < Vin < 8.5V
100
mV
Vcc Bypass Threshold
Vin Increasing
8.5
V
Vcc Bypass Hysteresis
300
mV
Vcc Output Impedance
Vcc Current Limit
Vin =6V
Vin = 10V
Vin = 48V
Vin = 48V
100
Ω
8.8
Ω
0.8
Ω
9.2
mA
Vcc UVLO
Vcc Increasing
5.3
V
Vcc UVLO hysteresis
190
mV
Vcc UVLO filter delay
3
µs
Iin Operating current
FB = 3V, Vin = 48V
550
750
µA
Iin Shutdown Current
RT/SD = 0V
110
176
µA
Switch Characteristics
Buckswitch Rds(on)
Gate Drive UVLO
Itest = 200 mA
Vbst – Vsw Rising
2.2
4.6
Ω
2.8
3.8
4.8
V
Gate Drive UVLO hysteresis
490
mV
Pre-charge switch voltage At 1 mA
0.8
V
Pre-charge switch on-time
150
ns
Current Limit
Current Limit Threshold
0.24
0.3
0.36
A
Current Limit Response Time
Iswitch Overdrive = 0.1A Time
350
ns
to Switch Off
TOFF-1
OFF time generator
FB=0V, RCL = 100K
35
µs
TOFF-2
OFF time generator
FB=2.3V, RCL = 100K
2.56
µs
On Time Generator
TON - 1
Vin = 10V
Ron = 200K
2.15
2.77
3.5
µs
TON - 2
Vin = 95V
Ron = 200K
200
300
420
ns
Remote Shutdown Threshold Rising
0.40
0.70
1.05
V
Remote Shutdown Hysteresis
35
mV
3
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