LM34919BTLX National Semiconductor Corporation, LM34919BTLX Datasheet - Page 4

• Manufacturer Part Number: LM34919BTLX
• Description: Lm34919b Ultra Small 40v, 600 Ma Constant On-time Buck Switching Regulator
• Manufacturer: National Semiconductor Corporation

www.national.com
Start-Up Regulator, V
Switch Characteristics
Softstart Pin
Current Limit
On Timer
UVLO
VIN to RTN
BST to RTN
SW to RTN (Steady State)
ESD Rating
BST to VCC
BST to SW
VCC to RTN
UVLO
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
over the full Operating Junction Temperature (T
statistical correlation. Typical values represent the most likely parametric norm at T
purposes only. Unless otherwise stated the following conditions apply: V
Symbol
V
Rds(on)
t
t
t
CC
ON
ON
ON
Human Body Model
V
I
I
LIM
I
SD
Q
SS
Reg
- 1
- 2
- 3
VCC
GD
V
V
V
V
V
measured at V
UVLO
V
measured at V
UVLO
I
I
Buck Switch Rds(on)
Gate Drive UVLO
UVLO
Pull-up voltage
Internal current source
Threshold
Resistance from ISEN to SGND
Response time
On-time
On-time
On-time
Shutdown threshold
(Note
IN
IN
CC
IN
CC
CC
CC
CC
operating current
shutdown current
-V
regulated output
Output Impedance
current limit (Note 3)
under-voltage lockout threshold
under-voltage lock-out threshold
CC
VCC
VCC
GD
2)
dropout voltage
CC
hysteresis
hysteresis, at V
filter delay
Parameter
CC
IN
CC
44V
52V
-1.5V to 44V
2kV
44V
14V
14V
Specifications with standard type are for T
(Note
J
) range. Minimum and Maximum limits are guaranteed through test, design, or
V
V
I
0 mA
0 mA
V
V
V
V
V
100 mV overdrive
Non-switching, FB = 3V, SW = Open
RON/SD = 0V, SW = Open
I
V
V
V
Current out of ISEN
V
V
V
Voltage at RON/SD rising
V
CC
TEST
IN
IN
CC
CC
CC
CC
IN
IN
BST
BST
SS
IN
IN
IN
1)
= 0 mA, non-switching
= 12V
=6V, I
increasing, I
decreasing, I
= 12V, R
= 24V, R
= 6V, R
= 1V
= UVLO
= 0V
increasing
decreasing
- V
- V
= 200 mA
≤
≤
I
I
SW
SW
CC
CC
CC
ON
Increasing
Decreasing
≤
≤
= 3 mA,
VCC
ON
ON
4
5 mA, V
5 mA, V
= 20 kΩ
= 20kΩ
= 20 kΩ
CC
Conditions
+ 250 mV
CC
SGND to RTN
SS, RON/SD to RTN
FB to RTN
Storage Temperature Range
For soldering specs see:
JunctionTemperature
VIN
Junction Temperature
Operating Ratings
= 3 mA
www.national.com/ms/MS/MS-SOLDERING.pdf
= 3 mA
IN
IN
IN
= 12V, R
= 6V
= 8V
J
ON
= 25°C, and are provided for reference
J
= 20kΩ. See
= 25°C only; limits in boldface type apply
2.65
0.52
Min
127
6.6
5.3
0.4
(Note
(Note
4).
5.91
5.25
5.25
0.78
10.5
0.64
0.74
Typ
150
215
400
135
170
110
335
5.1
5.1
0.5
3.6
3.2
2.5
1)
20
24
12
15
50
7
3
-0.3V to +0.3V
-0.3V to 4V
-0.3 to 7V
-65°C to +150°C
150°C
−40°C to + 125°C
Max
5.25
4.40
0.76
330
213
7.4
5.6
5.4
1.0
1.0
1.2
6.0V to 40V
Units
mΩ
mV
mA
mV
mA
mV
µA
µA
µs
ns
ns
ns
ns
Ω
Ω
V
V
V
V
V
V
V
A
V