LM26420, LM26420-Q0, LM26420-Q1
SNVS579J –FEBRUARY 2009–REVISED SEPTEMBER 2015
www.ti.com
6.6 Electrical Characteristics Per Buck
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
0.8
MAX
UNIT
V
VFB
Feedback Voltage
0.788
0.812
ΔVFB/VIN
IB
Feedback Voltage Line Regulation
Feedback Input Bias Current
VIN = 3 V to 5.5 V
0.05
0.4
%/V
nA
V
100
2.9
VIN Rising
VIN Falling
2.628
2.3
Undervoltage Lockout
UVLO Hysteresis
UVLO
2
V
330
2.2
mV
LM26420-X
1.85
0.4
2.65
0.7
FSW
Switching Frequency
MHz
kHz
LM26420-Y
0.55
300
150
91.5%
98%
75
LM26420-X
FFB
Frequency Fold-back
LM26420-Y
LM26420-X
86%
90%
DMAX
Maximum Duty Cycle
TOP Switch On Resistance
LM26420-Y
WQFN-16 Package
HTSSOP-20 Package
WQFN-16 Package
TSSOP-20 Package
VIN = 3.3 V
135
135
100
80
RDSON_TOP
mΩ
mΩ
70
55
RDSON_BOT
BOTTOM Switch On Resistance
TOP Switch Current Limit
45
ICL_TOP
ICL_BOT
2.4
0.4
3.3
A
A
BOTTOM Switch Reverse Current
Limit
VIN = 3.3 V
0.75
ΔΦ
Phase Shift Between SW1 and SW2
Enable Threshold Voltage
Enable Threshold Hysteresis
Switch Leakage
160
180
1.04
0.15
-0.7
5
200
°
0.97
1.12
VEN_TH
V
ISW_TOP
IEN
µA
nA
Enable Pin Current
Sink/Source
VPG-TH-U
Upper Power Good Threshold
Upper Power Good Hysteresis
Lower Power Good Threshold
Lower Power Good Hysteresis
FB Pin Voltage Rising
848
656
925
40
1,008
791
mV
mV
mV
mV
VPG-TH-L
FB Pin Voltage Rising
710
40
VINC Quiescent Current (non-
switching) with both outputs on
LM26420X/Y VFB = 0.9 V
LM26420X/Y VFB = 0.7 V
3.3
5.0
6.2
mA
µA
IQVINC
VINC Quiescent Current (switching)
with both outputs on
4.7
VINC Quiescent Current (shutdown)
All Options VEN = 0 V
0.05
0.9
VIND Quiescent Current (non-
switching)
LM26420X/Y VFB = 0.9 V
1.5
LM26420X VFB = 0.7 V
LM26420Q0X VFB = 0.7 V
LM26420Y VFB = 0.7 V
All Options VEN = 0 V
11
11
15
18
mA
IQVIND
VIND Quiescent Current (switching)
3.7
0.1
165
7.5
VIND Quiescent Current (shutdown)
Thermal Shutdown Temperature
µA
°C
TSD
6
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