LM34923 Datasheet, PDF (3/26 Pages) National Semiconductor (TI) – EVAL evaluation board provides the design engineer with a fully

LM34923
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SNVS695A – MARCH 2011 – REVISED FEBRUARY 2013
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings ⁽¹⁾⁽²⁾
VIN, UV to RTN
BST to RTN
SW to RTN (Steady State)
BST to VCC
BST to SW
VCC, UVO, RT to RTN
FB, RT, to RTN
ESD Rating, Human Body Model⁽³⁾
For soldering specifications see: Application Note SNOA549.
Junction Temperature
Storage Temperature Range
-0.3V to 80V
-0.3V to 88V
-1V to V_IN + 0.3V
80V
10V
–0.3V to 10V
-0.3 to 5V
2kV
150°C
-55°C to +150°C
(1) If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.
(2) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.
(3) The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Operating Ratings⁽¹⁾
V_IN
Operating Junction Temperature
6V to 75V
−40°C to + 125°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.
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 specified 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: VIN = 48V⁽¹⁾.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VCC Supply
Vcc Reg
Vcc Regulator Output
Vin = 48V
7.1
7.5
7.9
V
Vin – Vcc
Vcc Output Impedance
Vcc Current Limit
VIN = 6V, I_CC = 5mA
Vin =6V
Vin = 48V⁽²⁾
240
mV
45
Ω
20
30
mA
Vcc UVLO
Vcc Increasing
4
4.8
V
Vcc UVLO hysteresis
450
mV
Iin Operating current
FB = 3V, Vin = 48V
1
1.32
mA
Iin Shutdown Current
RT/SD = 0V
20
70
µA
Switch Characteristics
Buck switch Rds(on)
Itest = 200 mA
0.56
1.1
Ω
Gate Drive UVLO
Vbst – Vsw Rising
2.15
3
3.8
V
Gate Drive UVLO hysteresis
250
mV
Pre-charge switch voltage
At 1 mA
0.8
V
Pre-charge switch on-time
150
ns
(1) All electrical characteristics having room temperature limits are tested during production with T_A = T_J = 25°C. All hot and cold limits are
specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
(2) The V_CC output is intended as a self bias for the internal gate drive power and control circuits. Device thermal limitations limit external
loading.
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