Datasheet
LM20146
www.ti.com
SNVS563C –FEBRUARY 2008–REVISED APRIL 2013
Absolute Maximum Ratings
(1)(2)
Voltages from the indicated pins to GND
AVIN, PVIN, EN, PGOOD, SS/TRK, COMP, FB, RT -0.3V to +6V
Storage Temperature -65°C to 150°C
Junction Temperature 150°C
Power Dissipation
(3)
2.6W
Lead Temperature (Soldering, 10 sec) 260°C
Minimum ESD Rating
(4)
±2kV
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The maximum allowable power dissipation is a function of the maximum junction temperature, T
J_MAX
, the junctions-to-ambient thermal
resistance, θ
JA
, and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperature is calculated
using: P
D_MAX
= (T
J_MAX
– T
A
)/θ
JA
. The maximum power dissipations of 2.6W is determined using T
A
= 25°C, θ
JA
= 25°C/W, and T
J_MAX
= 125°C. The θ
JA
specification of 25°C/W listed in the electrical characteristics table is measured with the part surface mounted to a 2" x
2" FR4 4 layer board. See Figure 36 for more detailed θ
JA
information.
(4) The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor to each pin.
Operating Ratings
PVIN, AVIN to GND 2.95V to 5.5V
Junction Temperature −40°C to + 125°C
Electrical Characteristics
Unless otherwise stated, the following conditions apply: AVIN = PVIN = VIN = 5V. Limits in standard type are for T
J
= 25°C
only, limits in bold face type apply over the junction temperature (T
J
) range of -40°C to +125°C. 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.
Symbol Parameter Conditions Min Typ Max Unit
V
FB
Feedback pin voltage V
IN
= 2.95V to 5.5V 0.788 0.8 0.81 V
2
ΔV
OUT
/ΔI
OUT
Load Regulation I
OUT
= 100 mA to 6A 0.08 %/A
I
CL
Switch Current Limit Threshold V
IN
= 3.3V 7.35 8.5 9.35 A
R
DS_ON
High-Side Switch On Resistance I
SW
= 3.5A 20 27 mΩ
R
DS_ON
Low-Side Switch On Resistance I
SW
= 3.5A 16 23 mΩ
I
Q
Operating Quiescent Current Non-switching, V
FB
= V
COMP
3.5 6 mA
I
SD
Shutdown Quiescent current V
EN
= 0V 75 180 µA
V
UVLO
VIN Under Voltage Lockout Rising V
IN
2.45 2.7 2.95 V
V
UVLO_HYS
VIN Under Voltage Lockout Hysteresis Falling V
IN
45 100 mV
V
VCC
VCC Voltage I
VCC
= 0 µA 2.45 2.7 2.95 V
I
SS
Soft-Start Pin Source Current V
SS/TRK
= 0V 2 4.5 7 µA
V
TRACK
SS/TRK Accuracy, V
SS
- V
FB
V
SS/TRK
= 0.4V -10 3 15 mV
Oscillator
F
OSCH
Oscillator Frequency R
T
= 49.9 kΩ 675 750 825 kHz
F
OSCL
Oscillator Frequency R
T
= 249 kΩ 225 260 290 kHz
DC
MAX
Maximum Duty Cycle I
LOAD
= 0A 85 %
T
ON_TIME
Minimum On Time 100 ns
T
CL_BLANK
Current Sense Blanking Time After Rising V
SW
80 ns
Error Amplifier and Modulator
I
FB
Feedback pin bias current V
FB
= 0.8V 1 100 nA
I
COMP_SRC
COMP Output Source Current V
FB
= 0.6V, V
COMP
= 0.5V 80 100 µA
I
COMP_SNK
COMP Output Sink Current V
FB
= 1.0V, V
COMP
= 0.6V 80 100 µA
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