Datasheet

LM34923
www.ti.com 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 -0.3V to 80V
BST to RTN -0.3V to 88V
SW to RTN (Steady State) -1V to V
IN
+ 0.3V
BST to VCC 80V
BST to SW 10V
VCC, UVO, RT to RTN –0.3V to 10V
FB, RT, to RTN -0.3 to 5V
ESD Rating, Human Body Model
(3)
2kV
For soldering specifications see: Application Note SNOA549.
Junction Temperature 150°C
Storage Temperature Range -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
6V to 75V
Operating Junction Temperature −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 VIN = 6V, I
CC
= 5mA 240 mV
Vcc Output Impedance Vin =6V 45 Ω
Vcc Current Limit Vin = 48V
(2)
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.
Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LM34923