LTC3624_15 Datasheet, PDF (4/20 Pages) Linear Technology – 17V, 2A Synchronous Step-Down Regulator with 3.5A Quiescent Current

LTC3624/LTC3624-2
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_J = 25°C. (Note 2) V_IN = 12V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
V_MODE/SYNC
I_MODE/SYNC
t_SS
I_LIM
Pulse-Skipping Mode
Burst Mode Operation
Forced Continuous Mode
MODE/SYNC Input Current
Internal Soft-Start Time
Peak Current Limit
I_FB
I_FB(VOUT)
V_UVLO
V_UVLO(HYS)
V_OVLO
V_OVLO(HYS)
f_OSC
FB Input Current
Feedback Input Leakage Current
V_INTVCC Undervoltage Lockout
V_INTVCC Undervoltage Lockout Hysteresis
V_IN Overvoltage Lockout Rising
V_IN Overvoltage Lockout Hysteresis
Oscillator Frequency
V_IN > 5V (E-, I-Grade)
V_IN > 5V (H-Grade)
Fixed Output Versions
V_IN Ramping Up
LTC3624/LTC3624-3.3/LTC3624-5
(E-, I-Grade)
(H-Grade)
V_INTVCC – 0.4
1.0
0.3
V
V
V_INTVCC – 1.2
V
0
100
nA
1
ms
l
2.4
3
3.6
A
l
2.3
A
10
nA
2
10
µA
2.4
2.6
2.7
V
175
mV
l
18
19
20
V
500
mV
0.92
1.08
MHz
l 0.82
1.00
1.16
MHz
l 0.78
MHz
LTC3624-2/LTC3624-23.3/LTC3624-25
2.05
2.45
MHz
(E-, I-Grade)
l
1.8
2.25
2.6
MHz
(H-Grade)
l
1.7
MHz
f_SYNC
SYNC Capture Range
LTC3624/LTC3624-3.3/LTC3624-5
50
LTC3624-2/LTC3624-23.3/LTC3624-25
50
150
%
140
%
V_INTVCC
ΔV_PGOOD
V_INTVCC LDO Output Voltage
Power Good Range
V_IN > 4V
LTC3624/LTC3624-2
LTC3624-3.3/LTC3624-5/LTC3624-23.3/
LTC3624-25
3.2
3.6
4.0
V
±7.5
±11.5
%
±7.5
±13
%
R_PGOOD
t_PGOOD
Power Good Resistance
PGOOD Delay
PGOOD Low to High
PGOOD High to Low
280
350
Ω
0
Cycles
32
Cycles
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 LTC3624/LTC3624-2 is tested under pulsed load conditions
such that T_J ≈ T_A. The LTC3624E/LTC3624E-2 is guaranteed to meet
specifications from 0°C to 85°C junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC3624I/LTC3624I-2 is guaranteed over the –40°C to 125°C
operating junction temperature range and the LTC3624H is guaranteed
over the –40°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes; operation lifetime is
decreased for junction temperatures greater than 125°C. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. T_J is calculated from the ambient, T_A, and power dissipation, P_D,
according to the following formula:
T_J = T_A + (P_D • θ_JA)
Note 3: The quiescent current in forced continuous mode does not include
switching loss of the power FETs.
Note 4: The LTC3624 is tested in a proprietary test mode that servos FB to
the output of the error amplifier.
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when overtemperature
protection is active Continuous operation above the specified maximum
operating junction temperature may impair device reliability. The
overtemperature protection level is not production tested but guaranteed
by design.
36242fc
4
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