LM34910CSD National Semiconductor, LM34910CSD Datasheet - Page 4
LM34910CSD
Manufacturer Part Number
LM34910CSD
Description
High Voltage (50V, 1.25A) Step Down Switching Regulator
Manufacturer
National Semiconductor
Datasheet
1.LM34910CSD.pdf
(12 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM34910CSDX
Manufacturer:
TI/德州仪器
Quantity:
20 000
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