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