LTM8027
ELECTRICAL CHARACTERISTICS The ldenotes the specifications which apply over the full internal operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 20V, BIAS1 = BIAS2 = 10V, RUN = 2V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
V
V
Input DC Voltage
(Note 5)
4.5
60
V
V
IN
Maximum Output DC Voltage
Output DC Current
Minimum Start Voltage
Line Regulation
0A < I
≤ 4A, V = 48V
24
OUT
OUT
OUT
IN
I
V
IN
≤ 60V, V
= 12V, (Note 4)
0
4
A
OUT
V
7.5
V
IN(START)
V
V
= 12V, 15V< V < 60V, I
= 4A
≤ 4A
0.2
0.2
4.6
%
%
V
∆V /∆V
OUT
IN
LOAD
OUT
IN
Load Regulation
= 12V, V = 24V, 0A < I
∆V /∆I
OUT
IN
LOAD
OUT LOAD
UVLO(RISING)
V
V
V
Input Undervoltage Lockout Threshold
(Rising)
(Note 5)
Input Undervoltage Lockout Threshold
(Falling)
(Note 5)
3.7
V
UVLO(FALLING)
ADJ
ADJ Voltage
1.224
1.215
1.238
1.245
V
V
l
I
Quiescent Current into IN
V
BIAS
V
RUN
= V , V = 12VDC, No Load
AUX OUT
= 0V
39
9
mA
µA
Q(VIN)
V
BIAS1 Undervoltage Lockout (Rising)
BIAS1 Undervoltage Lockout (Falling)
6.5
6
V
V
BIAS1
BIAS1
I
Current into BIAS1
No Load
RUN = 0V
25
25
mA
µA
V
Minimum BIAS2 Voltage
3
1
V
µA
V
BIAS2
I
Current Into BIAS2
BIAS2
V
Minimum Voltage to Overdrive Internal
8.5
BIAS1(MINOV)
Regulator (INTV
)
CC
R
Internal Feedback Resistor
RUN Enable Voltage (Rising)
RUN Enable Voltage (Falling)
Switching Frequency
499
1.4
1.2
kΩ
V
FB
V
V
RUN(RISING)
RUN(FALLING)
V
f
R = 187kΩ
T
100
500
kHz
kHz
SW
T
R = 23.7kΩ
R
SYNC Input Resistance
SYNC Voltage Threshold
Soft-Start Charging Current
40
kΩ
V
SYNC
l
V
f
= 350kHz
2.3
SYNC(TH)
SYNC
I
2
µA
SS
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.
–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 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
Note 4: The maximum continuous output current may be derated by the
LTM8027 junction temperature.
Note 5: V voltages below the start-up threshold (7.5V) are only
IN
supported when BIAS1 is externally driven above 6.5V.
8027fd
3
For more information www.linear.com/LTM8027
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