(Notes 2, 3) ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiguraTion
TOP VIEW
TOP VIEW
PLL/MODE
TEMP
RST1
RST4
V
CC
TEMP
RT
RST1
EN1
31 EN4
30 FB4
29 V
INH
28 SWH
27 SWG
39
GND
26 V
ING
25 V
INF
24 SWF
23 SWE
22 V
INE
21 FB3
20 EN3
13 14 15 16 17 18 19
C1
C2
C3
WDI
WDO
CT
RST3
FB1
V
INA
SWA
SWB
V
INB
1
2
3
4
5
6
7
8
9
39
GND
38 PLL/MODE
37 RT
36
RST4
35 EN4
34 FB4
33 V
INH
32 SWH
31 SWG
30 V
ING
29 V
INF
28 SWF
27 SWE
26 V
INE
25 FB3
24 EN3
23
RST3
22 CT
21 WDO
20 WDI
EN1
38 37 36 35 34 33 32
FB1 1
V
INA
2
SWA 3
SWB 4
V
INB
5
V
INC
6
SWC 7
SWD 8
V
IND
9
FB2 10
EN2 11
RST2
12
V
CC
V
INC
10
SWC 11
SWD 12
V
IND
13
FB2 14
EN2 15
RST2
16
C1 17
C2 18
C3 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
LTC3371EUHF#PBF
LTC3371IUHF#PBF
LTC3371HUHF#PBF
LTC3371EFE#PBF
LTC3371IFE#PBF
LTC3371HFE#PBF
TAPE AND REEL
LTC3371EUHF#TRPBF
LTC3371IUHF#TRPBF
LTC3371HUHF#TRPBF
LTC3371EFE#TRPBF
LTC3371IFE#TRPBF
LTC3371HFE#TRPBF
PART MARKING*
3371
3371
3371
LTC3371FE
LTC3371FE
LTC3371FE
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.
Consult LTC Marketing for information on nonstandard 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/
3371fa
For more information
www.linear.com/LTC3371
3
LTC3371
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
INA-H
= 3.3V, unless otherwise specified.
SYMBOL
V
CC
V
CC(UVLO)
I
VCC(ALLOFF)
I
VCC
PARAMETER
V
CC
Voltage Range
Undervoltage Threshold on V
CC
V
CC
Input Supply Current
V
CC
Input Supply Current
V
CC
Voltage Falling
V
CC
Voltage Rising
All Switching Regulators in Shutdown
One Buck Active
PLL/MODE = 0V, R
T
= 400k,
V
FB_BUCK
= 0.85V
PLL/MODE = 2MHz
V
RT
= V
CC
, PLL/MODE = 0V
V
RT
= V
CC
, PLL/MODE = 0V
R
T
= 400k, PLL/MODE = 0V
t
LOW
, t
HIGH
> 60ns
For Synchronization
For Synchronization
R
T
= 400k
l
l
l
l
l
l
elecTrical characTerisTics
CONDITIONS
l
l
l
MIN
2.7
2.325
2.425
TYP
2.45
2.55
15
50
175
MAX
5.5
2.575
2.675
25
75
250
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
f
OSC
f
PLL/MODE
V
PLL/MODE
V
RT
Temp Monitor
V
TEMP(ROOM)
ΔV
TEMP
/°C
OT
OT Hyst
V
IN
V
OUT
V
IN(UVLO)
I
VIN
I
FWD
V
FB1
V
FB
I
FB
D
MAX
R
PMOS
R
NMOS
I
LEAKP
I
LEAKN
t
SS
V
PGOOD(FALL)
V
PGOOD(HYS)
Internal Oscillator Frequency
1.8
1.75
1.8
1
1.2
780
180
2
2
2
Synchronization Frequency
PLL/MODE Level High
PLL/MODE 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
800
220
7
170
10
820
260
1A Buck Regulators
l
l
2.25
V
FB
1.95
2.05
2.05
2.15
18
400
0
1.9
2.3
800
800
5.5
V
IN
2.15
2.25
30
600
2.5
2.7
808
820
50
300
240
V
V
V
V
µA
µA
µA
A
mV
mV
nA
%
mΩ
mΩ
V
IN
Voltage Falling
V
IN
Voltage Rising
l
l
Burst Mode Operation Input Current
V
FB
= 0.85V (Note 4)
Forced Continuous Mode Operation Input Current I
SW(BUCK)
= 0µA, FB = 0V
Shutdown Input Current
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
% of Regulated V
FB
% of Regulated V
FB
% of Regulated V
FB
96.8
93
V
FB
= 0.85V
V
FB
= 0V
I
SW
= 100mA
I
SW
= –100mA
EN = 0
EN = 0
–2
–2
l
(Note 5)
l
l
792
780
–50
100
2
2
1
98
95
0.3
99.2
97
µA
µA
ms
%
%
%
4
3371fa
For more information
www.linear.com/LTC3371
LTC3371
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
模拟电子
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