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LTM8027
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 20V, BIAS1 = BIAS2 = 10V, RUN = 2V, unless otherwise noted.
SYMBOL
V ADJ
I Q(VIN)
PARAMETER
ADJ Voltage
Quiescent Current into IN
CONDITIONS
V BIAS = V AUX , V OUT = 12VDC, No Load
V RUN = 0V
l
MIN
1.224
1.215
TYP
39
9
MAX
1.238
1.245
UNITS
V
V
mA
μA
V BIAS1
BIAS1 Undervoltage Lockout (Rising)
BIAS1 Undervoltage Lockout (Falling)
6.5
6
V
V
I BIAS1
V BIAS2
I BIAS2
V BIAS1(MINOV)
R FB
V RUN(RISING)
V RUN(FALLING)
f SW
R SYNC
Current into BIAS1
Minimum BIAS2 Voltage
Current Into BIAS2
Minimum Voltage to Overdrive Internal
Regulator (INTV CC )
Internal Feedback Resistor
RUN Enable Voltage (Rising)
RUN Enable Voltage (Falling)
Switching Frequency
SYNC Input Resistance
No Load
RUN = 0V
R T = 187kΩ
R T = 23.7kΩ
25
25
3
1
8.5
499
1.4
1.2
100
500
40
mA
μA
V
μA
V
kΩ
V
V
kHz
kHz
kΩ
V SYNC(TH)
I SS
SYNC Voltage Threshold
Soft-Start Charging Current
f SYNC = 350kHz
l
2.3
2
V
μA
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 RUN pin is internally clamped to 5V.
Note 3: The LTM8027E is guaranteed to meet performance specifications
from 0°C to 125°C internal operating temperature. Specifications over
the full –40°C to 125°C internal operating temperature range are assured
by design, characterization and correlation with statistical process
controls. The LTM8027I is guaranteed to meet specifications over the full
–40°C to 125°C internal operating temperature range. The LTM8027MP
is guaranteed to meet specifications over the full –55°C to 125°C
internal operating range. Note that the maximum internal temperature is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
Note 4: The maximum continuous output current may be derated by the
LTM8027 junction temperature.
Note 5: V IN voltages below the start-up threshold (7.5V) are only
supported when BIAS1 is externally driven above 6.5V.
8027fb
3
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