Datasheet

LT8620
3
8620fa
For more information www.linear.com/LT8620
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Exposure to any Absolute Maximum
Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The LT8620E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and
correlation with statistical process controls. The
LT8620I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8620H is guaranteed over the full −40°C to
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
2.9 3.4 V
V
IN
Quiescent Current V
EN/UV
= 0V, V
SYNC
= 0V
l
1.0
1.0
3
8
µA
µA
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V
l
1.7
1.7
4
10
µA
µA
V
EN/UV
= 2V, Not Switching, V
SYNC
= 2V 0.28 0.5 mA
V
IN
Current in Regulation V
OUT
= 0.97V, V
IN
= 6V, Output Load = 100µA
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 1mA
l
l
20
200
50
350
µA
µA
Feedback Reference Voltage V
IN
= 6V, I
LOAD
= 0.5A
V
IN
= 6V, I
LOAD
= 0.5A
l
0.964
0.958
0.970
0.970
0.976
0.982
V
V
Feedback Voltage Line Regulation V
IN
= 4.0V to 42V, I
LOAD
= 0.5A
l
0.004 0.02 %/V
Feedback Pin Input Current V
FB
= 1V –20 20 nA
INTV
CC
Voltage I
LOAD
= 0mA, V
BIAS
= 0V
I
LOAD
= 0mA, V
BIAS
= 3.3V
3.23
3.25
3.4
3.29
3.57
3.35
V
V
INTV
CC
Undervoltage Lockout 2.5 2.6 2.7 V
BIAS Pin Current Consumption V
BIAS
= 3.3V, I
LOAD
= 1A, 2MHz 7.2 mA
Minimum On-Time I
LOAD
= 1A, SYNC = 0V
I
LOAD
= 1A, SYNC = 3.3V
l
l
30
30
45
45
ns
ns
Minimum Off-Time 90 130 ns
Oscillator Frequency R
T
= 221k, I
LOAD
= 1A
R
T
= 60.4k, I
LOAD
= 1A
R
T
= 18.2k, I
LOAD
= 1A
l
l
l
180
665
1.85
210
700
2.00
240
735
2.15
kHz
kHz
MHz
Top Power NMOS On-Resistance I
SW
= 1A 175 mΩ
Top Power NMOS Current Limit
l
2.8 4.1 4.9 A
Bottom Power NMOS On-Resistance V
INTVCC
= 3.4V, I
SW
= 1A 85 mΩ
Bottom Power NMOS Current Limit V
INTVCC
= 3.4V 2.9 3.9 4.7 A
SW Leakage Current V
IN
= 42V, V
SW
= 0V, 42V –1.5 1.5 µA
EN/UV Pin Threshold EN/UV Rising
l
0.94 1.0 1.06 V
EN/UV Pin Hysteresis 40 mV
EN/UV Pin Current V
EN/UV
= 2V –20 20 nA
PG Upper Threshold Offset from V
FB
V
FB
Falling
l
6 9.0 12 %
PG Lower Threshold Offset from V
FB
V
FB
Rising
l
–6 –9.0 –12 %
PG Hysteresis 1.3 %
PG Leakage V
PG
= 3.3V –40 40 nA
PG Pull-Down Resistance V
PG
= 0.1V
l
680 2000 Ω
SYNC Threshold SYNC Falling
SYNC Rising
0.8
1.1
1.0
1.3
1.2
1.5
V
V
SYNC Pin Current V
SYNC
= 6V –100 100 nA
TR/SS Source Current
l
1.2 2 2.7 µA
TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 220 Ω
150°C operating junction
temperature range. The LT8620MP is 100%
tested and guaranteed over the full −55°C to 150°C operating junction
temperature range. High junction temperatures degrade operating lifetimes.
Operating lifetime is derated at junction temperatures greater than 125°C.
Note 3: This IC includes overtemperature protection that is intended to protect
the device during overload conditions. Junction temperature will exceed 150°C
when overtemperature protection is active. Continuous operation above
the
specified maximum operating junction temperature will reduce lifetime.
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