LTC3814-5_15 Datasheet, PDF (4/30 Pages) Linear Technology – 60V Current Mode Synchronous Step-Up Controller

LTC3814-5
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 = V_OFF = 5V, unless
otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
PG Delay
V_CC Regulators
V_EXTVCC
V_INTVCC,1
∆V_EXTVCC,1
∆V_LOADREG,1
V_INTVCC,2
∆V_LOADREG,2
I_NDRV
V_CCSR
I_CCSR
PGOOD Delay
V_FB Falling
EXTV_CC Switchover Voltage
EXTV_CC Rising
EXTV_CC Hysteresis
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
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)
125
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
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 LTC3814-5 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3814E-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 LTC3814I-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:
LTC3814-5: T_J = T_A + (P_D • 38°C/W)
Note 4: The LTC3814-5 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_SW).
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.
TYPICAL PERFORMANCE CHARACTERISTICS
Load Transient Response
Start-Up
V_OUT
200mV/DIV
I_OUT
2A/DIV
100μs/DIV
FRONT PAGE CIRCUIT
V_IN = 12V
0A TO 4A LOAD STEP
38145 G01
V_OUT
10V/DIV
RUN/SS
4V/DIV
I_L
5A/DIV
1ms/DIV
FRONT PAGE CIRCUIT
V_IN = 12V
I_LOAD = 1A
4
Overcurrent Operation
V_OUT
10V/DIV
I_L
5A/DIV
38145 G02
200μs/DIV
FRONT PAGE CIRCUIT V_RNG = 1V
V_IN = 12V
R_SHORT = 1Ω
38145 G03
38145fc