LM34910CSD National Semiconductor, LM34910CSD Datasheet - Page 4

• Manufacturer Part Number: LM34910CSD
• Description: High Voltage (50V, 1.25A) Step Down Switching Regulator
• Manufacturer: National Semiconductor

www.national.com
Start-Up Regulator, V
Switch Characteristics
Softstart Pin
Current Limit
On Timer
Off Timer
Regulation and Over-Voltage Comparators (FB Pin)
V
BST to GND
SW to GND (Steady State)
ESD Rating (Note 2)
BST to V
V
BST to SW
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
apply over full Operating Junction Temperature range. V
UVLO
UVLO
Symbol
V
Rds(on)
IN
IN
Human Body Model
t
t
ON
ON
CC
V
t
to GND
to SW
I
OFF
LIM
REF
Reg
- 1
- 2
VCC
GD
CC
V
V
V
V
V
threshold
UVLO
UVLO
I
I
Buck Switch Rds(on)
Gate Drive UVLO
UVLO
Pull-up voltage
Internal current source
Threshold
Resistance from I
Response time
On-time
On-time
Shutdown threshold
Threshold hysteresis
Minimum Off-time
FB regulation threshold
FB over-voltage threshold
FB bias current
IN
IN
CC
IN
CC
CC
CC
operating current
shutdown current
-V
regulated output
output impedance
current limit (Note 3)
under-voltage lockout
CC
VCC
VCC
GD
CC
dropout voltage
hysteresis
Parameter
hysteresis
filter delay
SEN
to S
GND
55V
70V
-1.5V
2kV
55V
55V
14V
Specifications with standard typeface are for T
I
V
0 mA
V
V
V
100 mV overdrive
Non-switching, FB = 3V
R
I
V
Current out of I
V
V
Voltage at R
Voltage at R
SS pin = steady state
CC
TEST
(Note 1)
CC
CC
CC
CC
ON
BST
IN
IN
= 0 mA,
= 10V, R
= 50V, R
/SD = 0V
= V
= 0V
increasing
decreasing
- V
= 200 mA
≤
CC
I
SW
CC
Conditions
Reg - 100 mV
Increasing
≤
ON
ON
ON
ON
IN
5 mA
/SD rising
/SD falling
= 24V, R
SEN
= 200 kΩ
= 200 kΩ
4
V
S
Current out of I
SS to RTN
All Other Inputs to GND
Storage Temperature Range
JunctionTemperature
V
Junction Temperature
Operating Ratings
CC
GND
IN
ON
to GND
= 200k unless otherwise stated (Note 5).
to RTN
2.440
0.35
Min
6.6
3.0
2.1
1
SEN
J
= 25°C, and those with boldface type
2.875
0.63
0.45
11.5
1.25
2.75
0.65
Typ
140
150
440
130
150
560
280
100
1.4
5.8
4.3
2.5
2.5
80
40
7
9
3
(Note 1)
2.550
Max
0.95
250
7.4
5.5
1.5
3.6
1.1
14V
-0.3V to +0.3V
See Text
-0.3V to 4V
-0.3 to 7V
-55°C to +150°C
150°C
1
−40°C to + 125°C
8.0V to 50V
Units
mΩ
mA
mV
mA
mV
mV
µA
µA
nA
µs
ns
µs
ns
ns
Ω
Ω
V
V
V
V
V
A
V
V
V