(Notes 2, 3) ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
MODE
TEMP
EN1
EN2
EN7
EN8
V
CC
TEMP
EN2
EN1
31 FB8
30 V
IN8
29 SW8
28 SW7
27 V
IN7
39
GND
26 FB7
25 FB6
24 V
IN6
23 SW6
22 SW5
21 V
IN5
20 FB5
13 14 15 16 17 18 19
EN4
EN3
SYNC
RT
EN6
PGOOD_ALL
EN5
FB1
V
IN1
SW1
SW2
V
IN2
FB2
1
2
3
4
5
6
7
8
9
39
GND
38 V
CC
37 MODE
36 EN7
35 EN8
34 FB8
33 V
IN8
32 SW8
31 SW7
30 V
IN7
29 FB7
28 FB6
27 V
IN6
26 SW6
25 SW5
24 V
IN5
23 FB5
22 EN5
21 EN6
20 RT
38 37 36 35 34 33 32
FB1 1
V
IN1
2
SW1 3
SW2 4
V
IN2
5
FB2 6
FB3 7
V
IN3
8
SW3 9
SW4 10
V
IN4
11
FB4 12
FB3 10
V
IN3
11
SW3 12
SW4 13
V
IN4
14
FB4 15
EN4 16
EN3 17
PGOOD_ALL 18
SYNC 19
UHF PACKAGE
38-LEAD (5mm
×
7mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
FE PACKAGE
38-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 25°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3374EUHF#PBF
LTC3374IUHF #PBF
LTC3374HUHF #PBF
LTC3374EFE #PBF
LTC3374IFE #PBF
LTC3374HFE #PBF
TAPE AND REEL
LTC3374EUHF#TRPBF
LTC3374IUHF#TRPBF
LTC3374HUHF#TRPBF
LTC3374EFE#TRPBF
LTC3374IFE#TRPBF
LTC3374HFE#TRPBF
PART MARKING*
3374
3374
3374
LTC3374FE
LTC3374FE
LTC3374FE
PACKAGE DESCRIPTION
38-Lead (5mm
×
7mm) Plastic QFN
38-Lead (5mm
×
7mm) Plastic QFN
38-Lead (5mm
×
7mm) Plastic QFN
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–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.
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3374fc
For more information
www.linear.com/LTC3374
3
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.
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
V
BUCK
V
OUT
V
IN_UVLO
I
VIN_BUCK
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
At Least 1 Buck Active
SYNC = 0V, R
T
= 400k, V
FB_BUCK
= 0.85V
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
ELECTRICAL CHARACTERISTICS
CONDITIONS
l
l
l
MIN
2.7
2.35
2.45
TYP
2.45
2.55
8
45
200
MAX
5.5
2.55
2.65
18
75
275
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
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
Buck Input Voltage Range
Buck Output 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 Leakage Current
Maximum Duty Cycle
PMOS On-Resistance
NMOS On-Resistance
PMOS Leakage Current
NMOS Leakage Current
Soft-Start Time
Falling PGOOD Threshold Voltage
PGOOD Hysteresis
PMOS Current Limit
PMOS Current Limit
PMOS Current Limit
R
RT
= 400k
l
800
150
6.75
820
Temperature Monitor
Temperature Rising
165
10
l
1A Buck Regulators
2.25
V
FB
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)
l
l
l
5.5
V
IN
2.05
2.15
18
400
0
1
2.15
2.25
50
550
1
2
2.7
820
50
300
300
V
V
V
V
µA
µA
µA
µA
A
mV
nA
%
mΩ
mΩ
1.95
2.05
I
FWD
V
FB
I
FB
DMAX
R
PMOS
R
NMOS
I
LEAKP
I
LEAKN
t
SS
V
PGOOD(FALL)
V
PGOOD(HYS)
I
FWD2
I
FWD3
I
FWD4
2.0
780
–50
l
2.3
800
V
FB_BUCK
= 0.85V
V
FB_BUCK
= 0V
I
SW_BUCK
= 100mA
I
SW_BUCK
= 100mA
EN_BUCK = 0
EN_BUCK = 0
(Note 6)
% of Regulated V
FB
% of Regulated V
FB
2 Buck Converters Combined (Note 5)
3 Buck Converters Combined (Note 5)
4 Buck Converters Combined (Note 5)
l
100
–2
–2
0.25
1
92.5
1
4.6
6.9
9.2
2
2
3
µA
µA
ms
%
%
A
A
A
Buck Regulators Combined
4
3374fc
For more information
www.linear.com/LTC3374
LTC3374
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
嵌入式系统
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