Datasheet
LM26420
SNVS579F –FEBRUARY 2009–REVISED MARCH 2013
www.ti.com
Electrical Characteristics Per Buck
VIN = 5V unless otherwise indicated under the Conditions column. 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
J
= 25°C, and are
provided for reference purposes only.
Symbol Parameter Conditions Min Typ Max Units
V
FB
Feedback Voltage 0.788 0.800 0.812 V
ΔV
FB
/V
IN
Feedback Voltage Line Regulation V
IN
= 3V to 5.5V 0.05 %/V
I
B
Feedback Input Bias Current 0.40 100 nA
V
IN
Rising 2.628 2.90 V
Under-voltage Lockout
UVLO V
IN
Falling 2.0 2.3 V
UVLO Hysteresis 330 mV
LM26420-X 1.85 2.2 2.65
F
SW
Switching Frequency MHz
LM26420-Y 0.4 0.55 0.7
LM26420-X 300
F
FB
Frequency Fold-back kHz
LM26420-Y 150
LM26420-X 86 91.5
D
MAX
Maximum Duty Cycle %
LM26420-Y 90 98
WQFN-16 Package 75 135
R
DSON_TOP
TOP Switch On Resistance mΩ
TSSOP-20 Package 70 135
WQFN-16 Package 55 100
R
DSON_BOT
BOTTOM Switch On Resistance mΩ
TSSOP-20 Package 45 80
I
CL_TOP
TOP Switch Current Limit V
IN
= 3.3V 2.4 3.3 A
I
CL_BOT
BOTTOM Switch Reverse Current Limit V
IN
= 3.3V 0.4 0.75 A
ΔΦ Phase Shift Between SW
1
and SW
2
160 180 200 °
Enable Threshold Voltage 0.97 1.04 1.12
V
EN_TH
V
Enable Threshold Hysteresis 0.15
I
SW_TOP
Switch Leakage -0.7 µA
I
EN
Enable Pin Current Sink/Source 5.0 nA
V
PG-TH-U
Upper Power Good Threshold FB Pin Voltage Rising 848 925 1,008 mV
Upper Power Good Hysteresis 40 mV
V
PG-TH-L
Lower Power Good Threshold FB Pin Voltage Rising 656 710 791 mV
Lower Power Good Hysteresis 40 mV
VINC Quiescent Current (non-switching) LM26420X/Y V
FB
= 0.9 3.3 5.0
with both outputs on
mA
I
QVINC
VINC Quiescent Current (switching) with LM26420X/Y V
FB
= 0.7 4.7 6.2
both outputs on
VINC Quiescent Current (shutdown) All Options V
EN
= 0V 0.05 µA
VIND Quiescent Current (non-switching) LM26420X/Y V
FB
= 0.9 0.9 1.5
LM26420X V
FB
= 0.7 11.0 15.0 mA
I
QVIND
VIND Quiescent Current (switching)
LM26420Y V
FB
= 0.7 3.7 7.5
VIND Quiescent Current (shutdown) All Options V
EN
= 0V 0.1 µA
WQFN-16 40
Junction to Ambient
θ
JA
0 LFPM Air Flow
(1)
TSSOP-20 35
°C/W
WQFN-16 6.8
θ
JC
Junction to Case
(1)
TSSOP-20 3.9
T
SD
Thermal Shutdown Temperature 165 °C
(1) Applies to a 4-layer standard JEDEC thermal test board or 4LJEDEC is 4"x3" in size. The board has 2 imbedded copper layers which
cover roughly the same size as the board. The copper thickness for the four layers, starting from the top one, is 2 oz./1oz./1oz./2 oz. For
WQFN, thermal vias are placed between the die attach pad in the 1st. copper layer and 2nd. copper layer.
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