LTC3855_15 Datasheet, PDF (2/44 Pages) Linear Technology – Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense

LTC3855
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage (V_IN).......................... –0.3V to 40V
Top Side Driver Voltages
BOOST1, BOOST2.................................. –0.3V to 46V
Switch Voltage (SW1, SW2).......................... –5V to 40V
INTV_CC, RUN1, RUN2, PGOOD(s), EXTV_CC,
(BOOST1-SW1), (BOOST2-SW2)............. –0.3V to 6V
SENSE1⁺, SENSE2⁺, SENSE1^–,
SENSE2^– Voltages.................................. –0.3V to 13V
MODE/PLLIN, I_LIM1, I_LIM2, TK/SS1, TK/SS2, FREQ,
DIFFOUT, PHASMD Voltages............. –0.3V to INTV_CC
DIFFP, DIFFN.......................................... –0.3V to INTV_CC
ITEMP1, ITEMP2 Voltages..................... –0.3V to INTV_CC
I_TH1, I_TH2, V_FB1, V_FB2 Voltages............... – 0.3V to INTV_CC
INTV_CC Peak Output Current (Note 8)...................100mA
Operating Junction Temperature Range (Notes 2, 3)
LTC3855.............................................–40°C to 125°C
Storage Temperature Range...................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
(FE Package)..................................................... 300°C
Pin Configuration
TOP VIEW
ITEMP2 1
ITEMP1 2
RUN1 3
SENSE1⁺ 4
SENSE1^– 5
TK/SS1 6
I_TH1 7
V_FB1 8
V_FB2 9
I_TH2 10
TK/SS2 11
SENSE2⁺ 12
SENSE2^– 13
DIFFP 14
DIFFN 15
DIFFOUT 16
RUN2 17
I_LIM1 18
I_LIM2 19
39
SGND
38 FREQ
37 MODE/PLLIN
36 PHASMD
35 CLKOUT
34 SW1
33 TG1
32 BOOST1
31 PGND1
30 BG1
29 V_IN
28 INTV_CC
27 EXTV_CC
26 BG2
25 PGND2
24 BOOST2
23 TG2
22 SW2
21 PGOOD2
20 PGOOD1
FE PACKAGE
38-LEAD PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 25°C/W
EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB
TOP VIEW
40 39 38 37 36 35 34 33 32 31
TK/SS1 1
30 TG1
I_TH1 2
V_FB1 3
SGND 4
29 BOOST1
28 PGND1
27 BG1
V_FB2 5
I_TH2 6
TK/SS2 7
SENSE2⁺ 8
SENSE2^– 9
41
SGND
26 V_IN
25 INTV_CC
24 EXTV_CC
23 BG2
22 PGND2
DIFFP 10
21 BOOST2
11 12 13 14 15 16 17 18 19 20
UJ PACKAGE
40-LEAD (6mm s 6mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 33°C/W
EXPOSED PAD (PIN 41) IS SGND, MUST BE SOLDERED TO PCB
3855f