LM34910_15 Datasheet, PDF (3/18 Pages) Texas Instruments – High Voltage (40V, 1.25A) Step Down Switching Regulator

LM34910
www.ti.com
SNVS297B – OCTOBER 2004 – REVISED MARCH 2013
Absolute Maximum Ratings⁽¹⁾⁽²⁾
V_IN to GND
BST to GND
SW to GND (Steady State)
ESD Rating⁽³⁾
BST to V_CC
V_IN to SW
BST to SW
V_CC to GND
S_GND to RTN
Current out of I_SEN
SS to RTN
All Other Inputs to GND
Storage Temperature Range
JunctionTemperature
Human Body Model
40V
50V
-1.5V
2kV
40V
40V
14V
14V
-0.3V to +0.3V
See Text
-0.3V to 4V
-0.3 to 7V
-55°C to +150°C
150°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 guaranteed specifications and test conditions, see the Electrical Characteristics.
(2) For detailed information on soldering plastic WSON packages, refer to the Packaging Data Book available from National Semiconductor
Corporation.
(3) The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Operating Ratings⁽¹⁾
V_IN
Junction Temperature
8.0V to 36V
−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 guaranteed specifications and test conditions, see the Electrical Characteristics.
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, R_ON = 200k unless otherwise stated ⁽¹⁾.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Start-Up Regulator, V_CC
V_CCReg
V_CC regulated output
V_IN-V_CC dropout voltage
UVLO_VCC
V_CC output impedance
V_CC current limit⁽²⁾
V_CC under-voltage lockout
threshold
I_CC = 0 mA,
V_CC = V_CCReg - 100 mV
0 mA ≤ I_CC ≤ 5 mA
V_CC = 0V
V_CC increasing
6.6
7
7.4
V
1.4
V
140
Ω
9
mA
5.8
V
UVLO_VCC hysteresis
UVLO_VCC filter delay
I_IN operating current
I_IN shutdown current
Switch Characteristics
V_CC decreasing
100 mV overdrive
Non-switching, FB = 3V
R_ON/SD = 0V
150
mV
3
µs
0.63
1
mA
80
250
µA
Rds(on)
UVLO_GD
Softstart Pin
Buck Switch Rds(on)
Gate Drive UVLO
UVLO_GD hysteresis
I_TEST = 200 mA
V_BST - V_SW Increasing
0.45
0.95
Ω
3.0
4.3
5.5
V
440
mV
Pull-up voltage
2.5
V
Internal current source
11.5
µA
(1) Typical specifications represent the most likely parametric norm at 25°C operation.
(2) V_CC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading
Copyright © 2004–2013, Texas Instruments Incorporated
Submit Documentation Feedback
3
Product Folder Links: LM34910