LTC3374
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = VIN1-8 = 3.3V, unless otherwise specified.
SYMBOL
PARAMETER
Voltage Range
CONDITIONS
MIN
TYP
MAX
UNITS
l
V
V
V
2.7
5.5
V
VCC
CC
l
l
Undervoltage Threshold on V
V
V
Voltage Falling
Voltage Rising
2.35
2.45
2.45
2.55
2.55
2.65
V
V
VCC_UVLO
CC
CC
CC
I
I
V
V
Input Supply Current
Input Supply Current
All Switching Regulators in Shutdown
At Least 1 Buck Active
8
18
µA
VCC_ALLOFF
CC
VCC
CC
SYNC = 0V, R = 400k, V
= 0.85V
45
200
75
275
µA
µA
T
FB_BUCK
SYNC = 2MHz
f
Internal Oscillator Frequency
Synchronization Frequency
V
V
= V , SYNC = 0V
1.8
1.75
1.8
2
2
2
2.2
2.25
2.2
MHZ
MHz
MHz
OSC
RT
RT
RT
CC
l
l
= V , SYNC = 0V
CC
R
= 400k, SYNC = 0V
f
t
, t > 40ns
LOW HIGH
1
3
MHz
SYNC
l
l
V
SYNC
SYNC Level High
SYNC Level Low
1.2
V
V
0.4
l
V
RT
RT Servo Voltage
R
= 400k
780
800
820
mV
RT
Temperature Monitor
TEMP Voltage at 25°C
Slope
V
150
6.75
165
10
mV
mV/°C
°C
TEMP(ROOM)
V
∆V
/°C
TEMP
TEMP
OT
Overtemperature Shutdown
Overtemperature Hysteresis
Temperature Rising
OT Hyst
1A Buck Regulators
°C
l
V
V
V
Buck Input Voltage Range
Buck Output Voltage Range
Undervoltage Threshold on V
2.25
5.5
V
V
BUCK
V
FB
V
IN
OUT
l
l
V
IN
V
IN
Voltage Falling
Voltage Rising
1.95
2.05
2.05
2.15
2.15
2.25
V
V
IN_UVLO
IN
I
Burst Mode® Operation
V
= 0.85V (Note 4)
18
400
0
50
550
1
µA
µA
µA
µA
VIN_BUCK
FB_BUCK
Forced Continuous Mode Operation
Shutdown Input Current
I
= 0µA, V
= 0V
SW_BUCK
FB_BUCK
All Switching Regulators in Shutdown
At Least One Other Buck Active
Shutdown Input Current
1
2
I
PMOS Current Limit
(Note 5)
2.0
780
–50
100
2.3
2.7
820
50
A
mV
nA
FWD
l
l
V
Feedback Regulation Voltage
Feedback Leakage Current
Maximum Duty Cycle
PMOS On-Resistance
NMOS On-Resistance
PMOS Leakage Current
NMOS Leakage Current
Soft-Start Time
800
FB
I
V
V
= 0.85V
= 0V
FB
FB_BUCK
FB_BUCK
SW_BUCK
SW_BUCK
DMAX
%
R
R
I
I
= 100mA
= 100mA
265
280
mΩ
mΩ
µA
PMOS
NMOS
LEAKP
LEAKN
SS
I
I
t
EN_BUCK = 0
EN_BUCK = 0
–2
–2
2
2
µA
1
92.5
1
ms
%
V
V
Falling PGOOD Threshold Voltage
PGOOD Hysteresis
PGOOD(FALL)
%
PGOOD(HYS)
Buck Regulators Combined
I
I
I
PMOS Current Limit
PMOS Current Limit
PMOS Current Limit
2 Buck Converters Combined (Note 5)
3 Buck Converters Combined (Note 5)
4 Buck Converters Combined (Note 5)
4.6
6.9
9.2
A
A
A
FWD2
FWD3
FWD4
3374f
4
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