LTC3812-5_15 Datasheet, PDF (4/34 Pages) Linear Technology – 60V Current Mode Synchronous Switching Regulator Controller

LTC3812-5
ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C (Note 2), INTV_CC = V_BOOST = V_RNG = V_EXTVCC = V_NDRV = 5V, V_FCB = V_SW =
0V, unless otherwise specified.
SYMBOL
I_PGOOD
PG Delay
V_CC Regulators
V_EXTVCC
V_INTVCC,1
∆V_EXTVCC,1
∆V_LOADREG,1
V_INTVCC,2
∆V_LOADREG,2
I_NDRV
I_NDRVTO
V_CCSR
I_CCSR
PARAMETER
PGOOD Leakage Current
PGOOD Delay
CONDITIONS
V_PGOOD = 5V
V_FB Falling
EXTV_CC Switchover Voltage
EXTV_CC Rising
EXTV_CC Hysterisis
INTV_CC Voltage from EXTV_CC
V_EXTVCC - V_INTVCC at Dropout
INTV_CC Load Regulation from EXTV_CC
INTV_CC Voltage from NDRV Regulator
INTV_CC Load Regulation from NDRV
Current into NDRV Pin
Linear Regulator Timeout Enable
Threshold
Maximum Supply Voltage
Maximum Current into NDRV/INTV_CC
6V < V_EXTVCC < 15V
I_CC = 20mA, V_EXTVCC = 5V
I_CC = 0mA to 20mA, V_EXTVCC = 10V
Linear Regulator in Operation
I_CC = 0mA to 20mA, V_EXTVCC = 0
V_NDRV – V_INTVCC = 3V
Trickle Charger Shunt Regulator
Trickle Charger Shunt Regulator,
INTV_CC ≤ 16.7V (Note 8)
MIN TYP MAX UNITS
0
2
μA
120
μs
l 4.5
4.7
V
0.1 0.25 0.4
V
5.2
5.5
5.8
V
75
150
mV
0.01
%
5.2
5.5
5.8
V
0.01
%
20
40
60
μA
210
270
350
μA
15
V
10
mA
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 LTC3812-5 is tested under pulsed load conditions such that
T_J ≈ T_A.The LTC3812E-5 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3812I-5 is guaranteed
to meet performance specifications over the full –40°C to 125°C operating
junction temperature range.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
LTC3812-5: T_J = T_A + (P_D • 38°C/W)
Note 4: The LTC3812-5 is tested in a feedback loop that servos V_FB to the
reference voltage with the I_TH pin forced to a voltage between 1V and 2V.
Note 5: The dynamic input supply current is higher due to the power
MOSFET gate charging being delivered at the switching frequency
(Q_G • f_OSC).
Note 6: Guaranteed by design. Not subject to test.
Note 7: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 8: I_CC is the sum of current into NDRV and INTV_CC.
PARAMETER
Maximum V_IN
MOSFET Gate Drive
INTV_CC UV⁺
INTV_CC UV^–
LTC3810
100V
6.35V to 14V
6.2V
6V
LTC3810-5
60V
4.5V to 14V
4.2V
4V
LTC3812-5
60V
4.5V to 14V
4.2V
4V
38125fc
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