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LM34919 Datenblatt(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Teilenummer LM34919
Bauteilbeschribung  Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM34919 Datenblatt(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.
VIN to RTN
44V
BST to RTN
52V
SW to RTN (Steady State)
-1.5V
ESD Rating (Note 2)
Human Body Model
2kV
BST to VCC
44V
VIN to SW
44V
BST to SW
14V
VCC to RTN
14V
SGND to RTN
-0.3V to +0.3V
SS to RTN
-0.3V to 4V
All Other Inputs to RTN
-0.3 to 7V
Storage Temperature Range
-65°C to +150°C
JunctionTemperature
150°C
Operating Ratings (Note 1)
VIN
8.0V to 40V
Junction Temperature
−40°C to + 125°C
Electrical Characteristics Specifications with standard type are for T
J = 25°C only; limits in boldface type apply
over the full Operating Junction Temperature (T
J) range. Minimum and Maximum limits are guaranteed through test, design, or
statistical correlation. Typical values represent the most likely parametric norm at T
J = 25°C, and are provided for reference
purposes only. Unless otherwise stated the following conditions apply: V
IN = 12V, RON = 200kΩ. See (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 = UVLOVCC + 250 mV
1.2
V
V
CC output impedance
0 mA
I
CC 5 mA, VIN = 8V
175
V
CC current limit (Note 3)
V
CC = 0V
9.5
mA
UVLO
VCC
V
CC under-voltage lockout threshold
V
CC increasing
5.7
V
UVLO
VCC hysteresis
V
CC decreasing
150
mV
UVLO
VCC filter delay
100 mV overdrive
3
µs
I
Q
I
IN operating current
Non-switching, FB = 3V, SW = Open
0.5
0.8
mA
I
SD
I
IN shutdown current
RON/SD = 0V, SW = Open
75
150
µA
Switch Characteristics
Rds(on)
Buck Switch Rds(on)
I
TEST = 200 mA
0.5
1.0
UVLO
GD
Gate Drive UVLO
V
BST - VSW Increasing
3.0
4.4
5.2
V
UVLO
GD hysteresis
480
mV
Softstart Pin
V
SS
Pull-up voltage
2.5
V
Internal current source
V
SS = 1V
10.5
µA
Current Limit
I
LIM
Threshold
Current out of ISEN
0.52
0.64
0.76
A
Resistance from ISEN to SGND
140
m
Response time
150
ns
On Timer
t
ON - 1
On-time
V
IN = 10V, RON = 200 kΩ
2.1
2.77
3.5
µs
t
ON - 2
On-time
V
IN = 40V, RON = 200 kΩ
700
ns
Shutdown threshold
Voltage at RON/SD rising
0.45
0.8
1.2
V
Threshold hysteresis
Voltage at RON/SD
25
mV
Off Timer
t
OFF
Minimum Off-time
155
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
2.9
V
FB bias current
FB = 3V
1
nA
www.national.com
4


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