Datasheet
LM22680
www.ti.com
SNVS595K –SEPTEMBER 2008–REVISED APRIL 2013
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 ensured 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
V
FB
Feedback Voltage V
IN
= 4.7V to 42V 1.266/1.259 1.285 1.304/1.311 V
I
Q
Quiescent Current V
FB
= 5V 3.4 6 mA
I
STDBY
Standby Quiescent Current EN Pin = 0V 25 40 µA
I
CL
Current Limit 2.32 2.8 3.4 A
I
L
Output Leakage Current V
IN
= 42V, EN Pin = 0V, V
SW
= 0V 0.2 2 µA
V
SW
= -1V 0.1 3 µA
R
DS(ON)
Switch On-Resistance 0.2 0.24/0.32 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 230 nA
V
EN
Enable Threshold Voltage Falling 1.3 1.6 1.9 V
V
ENHYST
Enable Voltage Hysteresis 0.6 V
I
EN
Enable Input Current EN Input = 0V 6 µA
F
SYNC
Maximum Synchronization V
SYNC
= 3.5V, 50% duty-cycle 1 MHz
Frequency
V
SYNC
Synchronization Threshold 1.75 V
Voltage
I
SS
Soft-Start Current 30 50 70 µA
T
SD
Thermal Shutdown Threshold 150 °C
θ
JA
Thermal Resistance MR Package, Junction to ambient 60 °C/W
thermal resistance
(3)
(1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured 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 ensured.
(3) The value of θ
JA
for the SO PowerPAD exposed pad (MR) package of 60°C/W is valid if package is mounted to 1 square inch of copper.
The θ
JA
value can range from 42 to 115°C/W depending on the amount of PCB copper dedicated to heat transfer.
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