Datasheet

LM22679/LM22679Q
www.ti.com SNVS581K –FEBRUARY 2013–REVISED NOVEMBER 2012
Absolute Maximum Ratings
(1)(2)
VIN to GND 43V
SS, IADJ Pin Voltage -0.5V to 7V
SW to GND
(3)
-5V to V
IN
Boot Pin Voltage V
SW
+ 7V
FB Pin Voltage -0.5V to 7V
Power Dissipation Internally Limited
Junction Temperature
(4)
150°C
ESD Rating
(5)
Human Body Model ±2 kV
Storage Temperature Range -65°C to +150°C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the recommended Operating Ratings is not implied. The recommended Operating Ratings
indicate conditions at which the device is functional and should not be operated beyond such conditions.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The absolute maximum specification of the ‘SW to GND’ applies to DC voltage. An extended negative voltage limit of -10V applies to a
pulse of up to 50 ns.
(4) For soldering specifications, refer to the following document: www.ti.com/lit/snoa549
(5) ESD was applied using the human body model, a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Operating Ratings
(1)
Supply Voltage (V
IN
) 4.5V to 42V
Junction Temperature Range -40°C to +125°C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the recommended Operating Ratings is not implied. The recommended Operating Ratings
indicate conditions at which the device is functional and should not be operated beyond such conditions.
Electrical Characteristics
Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction temperature (T
J
) range of -40°C
to +125°C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values
represent the most likely parametric norm at T
A
= T
J
= 25°C, and are provided for reference purposes only. Unless otherwise
specified: V
IN
= 12V.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
LM22679-5.0
V
FB
Feedback Voltage V
IN
= 8V to 42V 4.925/4.9 5.0 5.075/5.1 V
LM22679-ADJ
V
FB
Feedback Voltage V
IN
= 4.7V to 42V 1.266/1.259 1.285 1.304/1.311 V
All Output Voltage Versions
I
Q
Quiescent Current V
FB
= 5V 3.4 6 mA
V
ADJ
Current Limit Adjust Voltage 0.65 0.8 0.9 V
I
CL
Current Limit 6.0/5.75 7.1 8.4/8.75 A
V
IN
= 42V, SS Pin = 0V, V
SW
= 0V 32 60 µA
I
L
Output Leakage Current
V
SW
= -1V 31 75 µA
R
DS(ON)
Switch On-Resistance 0.10 0.14/0.2 Ω
f
O
Oscillator Frequency 400 500 600 kHz
T
OFFMIN
Minimum Off-time 100 200 300 ns
T
ONMIN
Minimum On-time 100 ns
I
BIAS
Feedback Bias Current V
FB
= 1.3V (ADJ Version Only) 230 nA
I
SS
Soft-start Current 30 50 70 µA
(1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation
using Statistical Quality Control (SQC) methods. Limits are used to calculate TI's Average Outgoing Quality Level (AOQL).
(2) Typical values represent most likely parametric norms at the conditions specified and are not guaranteed.
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