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LTC3371_15 Datasheet, PDF (4/26 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs with Watchdog and Power-On Reset
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LTC3371
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VCC = VINA-H = 3.3V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
VCC
VCC(UVLO)
IVCC(ALLOFF)
IVCC
VCC Voltage Range
Undervoltage Threshold on VCC
VCC Input Supply Current
VCC Input Supply Current
VCC Voltage Falling
VCC Voltage Rising
All Switching Regulators in Shutdown
One Buck Active
PLL/MODE = 0V, RT = 400k,
VFB_BUCK = 0.85V
PLL/MODE = 2MHz
fOSC
Internal Oscillator Frequency
fPLL/MODE
VPLL/MODE
Synchronization Frequency
PLL/MODE Level High
PLL/MODE Level Low
VRT = VCC, PLL/MODE = 0V
VRT = VCC, PLL/MODE = 0V
RT = 400k, PLL/MODE = 0V
tLOW, tHIGH > 60ns
For Synchronization
For Synchronization
VRT
RT Servo Voltage
Temp Monitor
RT = 400k
VTEMP(ROOM)
ΔVTEMP/°C
OT
TEMP Voltage at 25°C
VTEMP Slope
Overtemperature Shutdown
OT Hyst
Overtemperature Hysteresis
1A Buck Regulators
VIN
VOUT
VIN(UVLO)
IVIN
Buck Input Voltage Range
Buck Output Voltage Range
Undervoltage Threshold on VIN
VIN Voltage Falling
VIN Voltage Rising
Burst Mode Operation Input Current
VFB = 0.85V (Note 4)
Forced Continuous Mode Operation Input Current ISW(BUCK) = 0µA, FB = 0V
Shutdown Input Current
IFWD
VFB1
VFB
IFB
DMAX
RPMOS
RNMOS
ILEAKP
ILEAKN
tSS
VPGOOD(FALL)
VPGOOD(HYS)
PMOS Current Limit
Feedback Regulation Voltage for Buck 1
Feedback Regulation Voltage for Bucks 2-4
Feedback Leakage Current
Maximum Duty Cycle
PMOS On-Resistance
NMOS On-Resistance
PMOS Leakage Current
NMOS Leakage Current
Soft-Start Time
Falling PGOOD Threshold for Buck 1
Falling PGOOD Threshold for Bucks 2 to 4
PGOOD Hysteresis for Bucks 1 to 4
(Note 5)
VFB = 0.85V
VFB = 0V
ISW = 100mA
ISW = –100mA
EN = 0
EN = 0
% of Regulated VFB
% of Regulated VFB
% of Regulated VFB
MIN TYP MAX UNITS
l 2.7
5.5
V
l 2.325 2.45 2.575
V
l 2.425 2.55 2.675
V
15
25
µA
50
75
µA
175 250
µA
1.8
2
2.2
MHz
l 1.75
2
2.25 MHz
l 1.8
2
2.2
MHz
l1
3
MHz
l 1.2
l
V
0.4
V
l 780 800 820
mV
180 220 260
mV
7
mV/°C
170
°C
10
°C
l 2.25
5.5
V
l VFB
VIN
V
l 1.95 2.05 2.15
V
l 2.05 2.15 2.25
V
18
30
µA
400 600
µA
0
2.5
µA
1.9
2.3
2.7
A
l 792 800 808
mV
l 780 800 820
mV
–50
50
nA
l 100
%
300
mΩ
240
mΩ
–2
2
µA
–2
2
µA
1
ms
96.8
98
99.2
%
93
95
97
%
0.3
%
3371fa
4
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