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LTC3370_15 Datasheet, PDF (4/24 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs
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LTC3370
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 = VINA-H = 3.3V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC
VCC(UVLO)
IVCC(ALLOFF)
IVCC
VCC Voltage Range
Undervoltage Threshold on VCC
VCC Input Supply Current
VCC Input Supply Current
l 2.7
5.5
V
VCC Voltage Falling
VCC Voltage Rising
All Switching Regulators in Shutdown
l 2.325 2.45 2.575
V
l 2.425 2.55 2.675
V
0
2.5
µA
One Buck Active
PLL/MODE = 0V, RT = 400k, VFB(BUCK) = 0.85V
PLL/MODE = 2MHz
45
70
µA
170 250
µA
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 > 40ns
For Synchronization
For Synchronization
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
VRT
RT Servo Voltage
Temp Monitor
RT = 400k
l 780 800 820
mV
VTEMP(ROOM)
ΔVTEMP/°C
OT
TEMP Voltage at 25°C
VTEMP Slope
Overtemperature Shutdown
180 220 260
mV
7
mV/°C
170
°C
OT Hyst
Overtemperature Hysteresis
10
°C
1A Buck Regulators
VIN
VOUT
VIN(UVLO)
IVIN
Buck Input Voltage Range
Buck Output Voltage Range
Undervoltage Threshold on VIN
Burst Mode Operation Input Current
Forced Continuous Mode Operation
Input Current
Shutdown Input Current
VIN Voltage Falling
VIN Voltage Rising
VFB = 0.85V (Note 4)
ISW(BUCK) = 0µA, FB = 0V
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
IFWD
PMOS Current Limit
(Note 5)
VFB1
Feedback Regulation Voltage for Buck 1
VFB
Feedback Regulation Voltage for
Bucks 2-4
1.9
2.3
2.7
A
l 792 800 808
mV
l 780 800 820
mV
IFB
DMAX
RPMOS
RNMOS
ILEAKP
ILEAKN
tSS
VPGOOD(FALL)
VPGOOD(HYS)
Feedback Leakage Current
Maximum Duty Cycle
PMOS On-Resistance
NMOS On-Resistance
PMOS Leakage Current
VFB = 0.85V
VFB = 0V
ISW = 100mA
ISW = –100mA
EN = 0
NMOS Leakage Current
EN = 0
Soft-Start Time
Falling PGOOD Threshold for Buck 1
% of Regulated VFB
Falling PGOOD Threshold for Bucks 2 to 4 % of Regulated VFB
PGOOD Hysteresis for Bucks 1 to 4
% of Regulated VFB
–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
%
3370f
4
For more information www.linear.com/LTC3370
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