(Notes 2, 3) ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
orDer inForMaTion
LEAD FREE FINISH
LTC3375EUK#PBF
LTC3375IUK#PBF
LTC3375HUK#PBF
TAPE AND REEL
LTC3375EUK#TRPBF
LTC3375IUK#TRPBF
LTC3375HUK#TRPBF
PART MARKING*
LTC3375UK
LTC3375UK
LTC3375UK
PACKAGE DESCRIPTION
48-Lead (7mm
×
7mm) Plastic QFN
48-Lead (7mm
×
7mm) Plastic QFN
48-Lead (7mm
×
7mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
EN4 13
EN3 14
IRQ
15
RST
16
CT 17
SYNC 18
RT 19
ON 20
PB
21
KILL
22
EN6 23
EN5 24
3375fa
For more information
www.linear.com/3375
3
LTC3375
elecTrical characTerisTics
SYMBOL
V
VCC
V
VCC_UVLO
I
VCC_ALLOFF
I
VCC
f
OSC
f
SYNC
V
SYNC
V
RT
V
TEMP(ROOM)
∆V
TEMP
/°C
OT
OT_HYST
DT_WARN
PARAMETER
V
CC
Voltage Range
Undervoltage Threshold on V
CC
V
CC
Input Supply Current
V
CC
Input Supply Current
Internal Oscillator Frequency
V
CC
Voltage Falling
V
CC
Voltage Rising
All Switching Regulators in Shutdown,
PB
= HIGH
At Least 1 Buck Active, SYNC = 0V, R
T
= 400k,
V
FB_BUCK
= 0.85V
At Least 1 Buck Active, SYNC = 2MHz
V
RT
= V
CC
, SYNC = 0V
V
RT
= V
CC
, SYNC = 0V
R
RT
= 400k, SYNC = 0V
t
LOW
, t
HIGH
> 40ns
l
l
l
l
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.
CONDITIONS
l
l
l
MIN
2.7
2.35
2.45
TYP
2.45
2.55
11
50
200
MAX
5.5
2.55
2.65
25
85
325
2.2
2.25
2.2
3
0.4
UNITS
V
V
V
µA
µA
µA
MHz
MHz
MHz
MHz
V
V
mV
mV
mV/°C
°C
°C
°C
°C
°C
1.8
1.75
1.8
1
1.2
780
2
2
2
Synchronization Frequency
SYNC Level High
SYNC Level Low
RT Servo Voltage
TEMP Voltage at 25°C
V
TEMP
Slope
Overtemperature Shutdown
Overtemperature Hysteresis
R
RT
= 400k
l
800
150
820
Temperature Monitor
l
6.75
165
10
Inactive
140
125
110
Temperature Rising
Die Temperature Warning Threshold (Die DT[1], DT[0] = 00
Temperature that Causes
IRQ
= 0)
DT[1], DT[0] = 01
DT[1], DT[0] = 10
DT[1], DT[0] = 11
Buck Input Voltage Range
Undervoltage Threshold on V
IN
Burst Mode
®
Operation
Forced Continuous Mode Operation
Shutdown Input Current
Shutdown Input Current
PMOS Current Limit
Feedback Regulation Voltage
Feedback Regulation Voltage
Feedback Regulation Voltage
V
FB
Servo Voltage Step Size
Feedback Leakage Current
Maximum Duty Cycle
PMOS On-Resistance
NMOS On-Resistance
PMOS Leakage Current
NMOS Leakage Current
Soft-Start Time
V
FB_BUCK
= 0.85V
V
FB_BUCK
= 0V
I
SW_BUCK
= 100mA
I
SW_BUCK
= –100mA
EN_BUCK = 0
EN_BUCK = 0
Default (1, 1, 0, 0) Reference Voltage
–2
–2
l
l
l
1A Buck Regulators
V
BUCK
V
OUT
V
IN_UVLO
I
VIN_BUCK
V
IN
Voltage Falling
V
IN
Voltage Rising
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
(Note 5)
Forced Continuous Mode Default (1, 1, 0, 0)
Forced Continuous Mode Full Scale (1, 1, 1, 1)
l
l
2.25
V
FB
1.95
2.05
2.05
2.15
18
400
0
1
2.0
705
780
405
–50
100
265
280
2.3
725
800
425
25
5.5
V
IN
2.15
2.25
50
550
1
2
2.7
745
820
445
50
V
V
V
V
µA
µA
µA
µA
A
mV
mV
mV
mV
nA
%
mΩ
mΩ
l
l
I
FWD
V
FB
(Default)
V
FB
(High)
V
FB
(Low)
V
LSB
I
FB
DMAX
R
PMOS
R
NMOS
I
LEAKP
I
LEAKN
R
SWPD
t
SS
Forced Continuous Mode Zero Scale (0, 0, 0, 0)
l
2
2
1
1
µA
µA
kΩ
ms
3375fa
Output Pull-Down Resistance in Shutdown EN_BUCK = 0 (I
2
C Bit Set)
4
For more information
www.linear.com/3375
LTC3375
elecTrical characTerisTics
SYMBOL
V
PGOOD(FALL)
V
PGOOD(HYS)
I
FWD2
I
FWD3
I
FWD4
V
CC
Regulator
V
FBVCC
R
REG
V
VSHNT_MAX
R
CLAMP
I
2
C Port
ADDRESS
V
IH
V
IL
I
IH
I
IL
V
OL_SDA
f
SCL
t
BUF
t
HD_SDA
t
SU_STA
t
SU_STO
t
HD_DAT(O)
t
HD_DAT(I)
t
SU_DAT
t
LOW
t
HIGH
t
f
t
r
I
OH
V
OL
V
IH
V
IL
t
WDI
t
WDO
t
WDRESET
I
2
C Address
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
SDA Output Low Voltage
Clock Operating Frequency
Bus Free Time Between Stop and Start
Condition
Hold Time After Repeated Start
Condition
Repeated Start Condition Set-Up Time
Stop Condition Set-Up Time
Data Hold Time Output
Data Hold Time Input
Data Set-Up Time
SCL Clock Low Period
SCL Clock High Period
Clock/Data Fall Time
Clock/Data Rise Time
Output High Leakage Current
Output Low Voltage
Input High Threshold
Input Low Threshold
Time From Last WDI
WDO Low Time Absent a Transition at WDI
Time From a WDI Transition Until the
WD Timer Is Reset
C
B
= Capacitance of One Bus Line (pF)
C
B
= Capacitance of One Bus Line (pF)
ON,
RST, IRQ,
WDO 5.5V at Pin
ON,
RST, IRQ,
WDO 3mA Into Pin
KILL, PB,
WDI
KILL, PB,
WDI
l
l
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
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