DC1307A Datasheet, PDF (3/22 Pages) Linear Technology – Complete Switch Mode Power Supply

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
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_ADJ
ADJ Voltage
1.224
l 1.215
1.238
V
1.245
V
I_Q(VIN)
V_BIAS1
Quiescent Current into IN
BIAS1 Undervoltage Lockout (Rising)
BIAS1 Undervoltage Lockout (Falling)
V_BIAS = V_AUX, V_OUT = 12VDC, No Load
V_RUN = 0V
39
mA
9
µA
6.5
V
6
V
I_BIAS1
Current into BIAS1
No Load
RUN = 0V
25
mA
25
µA
V_BIAS2
I_BIAS2
V_BIAS1(MINOV)
R_FB
V_RUN(RISING)
V_RUN(FALLING)
f_SW
R_SYNC
V_SYNC(TH)
I_SS
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
SYNC Voltage Threshold
Soft-Start Charging Current
R_T = 187kΩ
R_T = 23.7kΩ
f_SYNC = 350kHz
3
V
1
µA
8.5
V
499
kΩ
1.4
V
1.2
V
100
kHz
500
kHz
40
kΩ
l 2.3
V
2
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
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