LM34910_15 Datasheet, PDF (4/18 Pages) Texas Instruments – High Voltage (40V, 1.25A) Step Down Switching Regulator

LM34910
SNVS297B – OCTOBER 2004 – REVISED MARCH 2013
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Electrical Characteristics (continued)
Specifications with standard typeface are for T_J = 25°C, and those with boldface type apply over full Operating Junction
Temperature range. V_IN = 24V, R_ON = 200k unless otherwise stated ⁽¹⁾.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Current Limit
I_LIM
Threshold
Current out of I_SEN
Resistance from I_SEN to S_GND
Response time
1
1.25
1.5
A
130
mΩ
150
ns
On Timer
t_ON - 1
t_ON - 2
Off Timer
On-time
On-time
Shutdown threshold
Threshold hysteresis
V_IN = 10V, R_ON = 200 kΩ
2.1
2.75
3.6
µs
V_IN = 36V, R_ON = 200 kΩ
740
ns
Voltage at R_ON/SD rising
0.35
0.65
1.1
V
Voltage at R_ON/SD falling
40
mV
t_OFF
Minimum Off-time
Regulation and Over-Voltage Comparators (FB Pin)
280
ns
V_REF
FB regulation threshold
FB over-voltage threshold
SS pin = steady state
2.440
2.5
2.550
V
2.875
V
FB bias current
100
nA
Thermal Shutdown
T_SD
Thermal shutdown temperature
Thermal shutdown hysteresis
175
°C
20
°C
4
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