LTC3374 Datasheet, PDF (4/24 Pages) Linear Technology – 8-Channel Parallelable 1A Buck DC/DCs

LTC3374
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). V_CC = V_IN1-8 = 3.3V, unless otherwise specified.
SYMBOL
V_VCC
V_{VCC_UVLO}
I_{VCC_ALLOFF}
I_VCC
PARAMETER
V_CC Voltage Range
Undervoltage Threshold on V_CC
V_CC Input Supply Current
V_CC Input Supply Current
f_OSC
Internal Oscillator Frequency
f_SYNC
V_SYNC
Synchronization Frequency
SYNC Level High
SYNC Level Low
V_RT
RT Servo Voltage
Temperature Monitor
V_TEMP(ROOM)
∆V_TEMP/°C
OT
TEMP Voltage at 25°C
V_TEMP Slope
Overtemperature Shutdown
OT Hyst
Overtemperature Hysteresis
1A Buck Regulators
V_BUCK
V_OUT
V_{IN_UVLO}
Buck Input Voltage Range
Buck Output Voltage Range
Undervoltage Threshold on V_IN
I_{VIN_BUCK}
Burst Mode^® Operation
Forced Continuous Mode Operation
Shutdown Input Current
Shutdown Input Current
I_FWD
V_FB
I_FB
DMAX
PMOS Current Limit
Feedback Regulation Voltage
Feedback Leakage Current
Maximum Duty Cycle
R_PMOS
PMOS On-Resistance
R_NMOS
NMOS On-Resistance
I_LEAKP
PMOS Leakage Current
I_LEAKN
NMOS Leakage Current
t_SS
Soft-Start Time
V_PGOOD(FALL) Falling PGOOD Threshold Voltage
V_PGOOD(HYS)
PGOOD Hysteresis
Buck Regulators Combined
I_FWD2
I_FWD3
I_FWD4
PMOS Current Limit
PMOS Current Limit
PMOS Current Limit
CONDITIONS
V_CC Voltage Falling
V_CC Voltage Rising
All Switching Regulators in Shutdown
At Least 1 Buck Active
SYNC = 0V, R_T = 400k, V_{FB_BUCK} = 0.85V
SYNC = 2MHz
V_RT = V_CC, SYNC = 0V
V_RT = V_CC, SYNC = 0V
R_RT = 400k, SYNC = 0V
t_LOW, t_HIGH > 40ns
R_RT = 400k
Temperature Rising
V_IN Voltage Falling
V_IN Voltage Rising
V_{FB_BUCK} = 0.85V (Note 4)
I_{SW_BUCK} = 0µA, V_{FB_BUCK} = 0V
All Switching Regulators in Shutdown
At Least One Other Buck Active
(Note 5)
V_{FB_BUCK} = 0.85V
V_{FB_BUCK} = 0V
I_{SW_BUCK} = 100mA
I_{SW_BUCK} = 100mA
EN_BUCK = 0
EN_BUCK = 0
2 Buck Converters Combined (Note 5)
3 Buck Converters Combined (Note 5)
4 Buck Converters Combined (Note 5)
MIN
l 2.7
l 2.35
l 2.45
1.8
l 1.75
l 1.8
1
l 1.2
l
l 780
l 2.25
V_FB
l 1.95
l 2.05
2.0
l 780
–50
l 100
–2
–2
TYP
MAX
5.5
2.45
2.55
2.55
2.65
8
18
45
75
200
275
2
2.2
2
2.25
2
2.2
3
0.4
800
820
150
6.75
165
10
5.5
V_IN
2.05
2.15
2.15
2.25
18
50
400
550
0
1
1
2
2.3
2.7
800
820
50
265
280
2
2
1
92.5
1
4.6
6.9
9.2
UNITS
V
V
V
µA
µA
µA
MHZ
MHz
MHz
MHz
V
V
mV
mV
mV/°C
°C
°C
V
V
V
V
µA
µA
µA
µA
A
mV
nA
%
mΩ
mΩ
µA
µA
ms
%
%
A
A
A
3374f
4
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