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LM34910 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM34910
Description  High Voltage (40V, 1.25A) Step Down Switching Regulator
PDF  11 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM34910 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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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.
V
IN to GND
40V
BST to GND
50V
SW to GND (Steady State)
-1.5V
ESD Rating (Note 2)
Human Body Model
2kV
BST to V
CC
40V
V
IN to SW
40V
BST to SW
14V
V
CC to GND
14V
S
GND to RTN
-0.3V to +0.3V
Current out of I
SEN
See Text
SS to RTN
-0.3V to 4V
All Other Inputs to GND
-0.3 to 7V
Storage Temperature Range
-55˚C to +150˚C
JunctionTemperature
150˚C
Operating Ratings (Note 1)
V
IN
8.0V to 36V
Junction Temperature
−40˚C to + 125˚C
Electrical Characteristics 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, RON = 200k unless otherwise stated (Note 5).
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Start-Up Regulator, V
CC
V
CCReg
V
CC regulated output
6.6
7
7.4
V
V
IN-VCC dropout voltage
I
CC = 0 mA,
V
CC =VCCReg - 100 mV
1.4
V
V
CC output impedance
0 mA
≤ I
CC
≤ 5 mA
140
Ω
V
CC current limit (Note 3)
V
CC =0V
9
mA
UVLO
VCC
V
CC under-voltage lockout
threshold
V
CC increasing
5.8
V
UVLO
VCC hysteresis
V
CC decreasing
150
mV
UVLO
VCC filter delay
100 mV overdrive
3
µs
I
IN operating current
Non-switching, FB = 3V
0.63
1
mA
I
IN shutdown current
R
ON/SD=0V
80
250
µA
Switch Characteristics
Rds(on)
Buck Switch Rds(on)
I
TEST = 200 mA
0.45
0.95
Ω
UVLO
GD
Gate Drive UVLO
V
BST -VSW Increasing
3.0
4.3
5.5
V
UVLO
GD hysteresis
440
mV
Softstart Pin
Pull-up voltage
2.5
V
Internal current source
11.5
µA
Current Limit
I
LIM
Threshold
Current out of I
SEN
1
1.25
1.5
A
Resistance from I
SEN to SGND
130
m
Ω
Response time
150
ns
On Timer
t
ON - 1
On-time
V
IN = 10V, RON = 200 k
Ω
2.1
2.75
3.6
µs
t
ON - 2
On-time
V
IN = 36V, RON = 200 k
Ω
740
ns
Shutdown threshold
Voltage at R
ON/SD rising
0.35
0.65
1.1
V
Threshold hysteresis
Voltage at R
ON/SD falling
40
mV
Off Timer
t
OFF
Minimum Off-time
280
ns
Regulation and Over-Voltage Comparators (FB Pin)
V
REF
FB regulation threshold
SS pin = steady state
2.440
2.5
2.550
V
FB over-voltage threshold
2.875
V
FB bias current
100
nA
www.national.com
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