LTC3855EFE#PBF Linear Technology, LTC3855EFE#PBF Datasheet - Page 2

• Manufacturer Part Number: LTC3855EFE#PBF
• Description: IC BUCK SYNC ADJ 25A DL 38TSSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3855EFE#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.6 ~ 3.3 V, 0.6 ~ 12.5 V
• Current - Output: 25A
• Frequency - Switching: 250kHz ~ 770kHz
• Voltage - Input: 4.5 ~ 38 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-TSSOP Exposed Pad, 38-eTSSOP, 38-HTSSOP
• Primary Input Voltage: 38V
• No. Of Outputs: 2
• Output Voltage: 12.5V
• No. Of Pins: 38
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Switching Frequency Max: 770kHz
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

absoluTe MaxiMuM raTings
LTC3855
(Note 1)
Input Supply Voltage (V
Top Side Driver Voltages
Switch Voltage (SW1, SW2) ......................... –5V to 40V
INTV
SENSE1
MODE/PLLIN, I
pin conFiguraTion

BOOST1, BOOST2 .................................. –0.3V to 46V
(BOOST1-SW1), (BOOST2-SW2) ............. –0.3V to 6V
SENSE2
DIFFOUT, PHASMD Voltages ............. –0.3V to INTV
CC
, RUN1, RUN2, PGOOD(s), EXTV
+
, SENSE2
EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB
–
Voltages ................................. –0.3V to 13V
SENSE1
SENSE1
SENSE2
SENSE2
DIFFOUT
LIM1
ITEMP2
ITEMP1
TK/SS1
TK/SS2
DIFFN
RUN1
DIFFP
RUN2
I
I
V
V
LIM1
LIM2
I
I
TH1
TH2
FB1
FB2
+
, I
, SENSE1
+
–
+
–
T
JMAX
LIM2
38-LEAD PLASTIC SSOP
10
11
12
13
14
15
16
17
18
19
1
2
3
4
5
6
7
8
9
IN
= 125°C, θ
FE PACKAGE
) ......................... –0.3V to 40V
, TK/SS1, TK/SS2, FREQ,
TOP VIEW
SGND
39
–
,
JA
= 25°C/W
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
FREQ
MODE/PLLIN
PHASMD
CLKOUT
SW1
TG1
BOOST1
PGND1
BG1
V
INTV
EXTV
BG2
PGND2
BOOST2
TG2
SW2
PGOOD2
PGOOD1
IN
CC
CC
CC
,
CC
DIFFP , DIFFN .......................................... –0.3V to INTV
ITEMP1, ITEMP2 Voltages .................... –0.3V to INTV
I
INTV
Operating Junction Temperature Range (Notes 2, 3)
Storage Temperature Range ...................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
TH1
LTC3855 .............................................–40°C to 125°C
(FE Package) ..................................................... 300°C
, I
SENSE2
SENSE2
CC
TK/SS1
TK/SS2
TH2
SGND
DIFFP
V
V
I
I
Peak Output Current (Note 8) ..................100mA
TH1
TH2
FB1
FB2
EXPOSED PAD (PIN 41) IS SGND, MUST BE SOLDERED TO PCB
, V
+
–
10
1
2
3
4
5
6
7
8
9
FB1
40
11
40-LEAD (6mm 6mm) PLASTIC QFN
, V
39
12 13 14 15
FB2
T
JMAX
38 37 36 35 34 33 32 31
Voltages .............. –0.3V to INTV
= 125°C, θ
UJ PACKAGE
TOP VIEW
SGND
41
16 17 18 19
JA
= 33°C/W
20
30
29
28
27
26
25
24
23
22
21
TG1
BOOST1
PGND1
BG1
V
INTV
EXTV
BG2
PGND2
BOOST2
IN
CC
CC
3855f
CC
CC
CC