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DCS WDI Specifications Page 4

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LTC3375
4
3375fc
For more information www.linear.com/3375
elecTrical characTerisTics
The l denotes the specifications which apply over the specified 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 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,
PB = HIGH
11 25 µA
I
VCC
V
CC
Input Supply Current At Least 1 Buck Active, SYNC = 0V, R
T
= 400k,
V
FB_BUCK
= 0.85V
At Least 1 Buck Active, SYNC = 2MHz
50
200
85
325
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
l
6.75 mV/°C
OT Overtemperature Shutdown Temperature Rising 165 °C
OT_HYST Overtemperature Hysteresis 10 °C
DT_WARN Die Temperature Warning Threshold (Die
Temperature that Causes IRQ = 0)
DT[1], DT[0] = 00
DT[1], DT[0] = 01
DT[1], DT[0] = 10
DT[1], DT[0] = 11
Inactive
140
125
110
°C
°C
°C
1A Buck Regulators
V
BUCK
Buck Input Voltage Range
l
2.25 5.5 V
V
OUT
l
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
(Default) Feedback Regulation Voltage Forced Continuous Mode Default (1, 1, 0, 0)
l
705 725 745 mV
V
FB
(High) Feedback Regulation Voltage Forced Continuous Mode Full Scale (1, 1, 1, 1)
l
780 800 820 mV
V
FB
(Low) Feedback Regulation Voltage Forced Continuous Mode Zero Scale (0, 0, 0, 0)
l
405 425 445 mV
V
LSB
V
FB
Servo Voltage Step Size 25 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
R
SWPD
Output Pull-Down Resistance in Shutdown EN_BUCK = 0 (I
2
C Bit Set) 1 kΩ
t
SS
Soft-Start Time Default (1, 1, 0, 0) Reference Voltage 1 ms
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