LTC3731 Datasheet, PDF (2/32 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731
ABSOLUTE AXI U RATI GS (Note 1)
Topside Driver Voltages (BOOST_N) ............ 38V to –0.3V
Switch Voltage (SW_N)................................... 32V to –5V
Boosted Driver Voltage (BOOST_N – SW_N) .... 7V to –0.3V
Peak Output Current <1ms (TG_N, BG_N) ..................... 5A
Supply Voltages (V_CC, V_DR), PGOOD
Pin Voltage .................................................. 7V to –0.3V
RUN/SS, PLLFLTR, PLLIN, UVADJ,
FCB Voltages ............................................. V_CC to –0.3V
I_TH Voltage ................................................ 2.4V to –0.3V
Operating Ambient Temperature Range
LTC3731C .................................................... 0°C to 70°C
LTC3731I ................................................. –40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature G Package (Soldering, 10sec).. 300°C
Peak Body Temperature UH Package ................... 240°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V_CC 1
PLLIN 2
PLLFLTR 3
FCB 4
IN⁺ 5
IN^– 6
DIFFOUT 7
EAIN 8
SGND 9
SENSE1⁺ 10
SENSE1^– 11
SENSE2⁺ 12
SENSE2^– 13
SENSE3^– 14
SENSE3⁺ 15
RUN/SS 16
I_TH 17
UVADJ 18
36 CLKOUT
35 PGOOD
34 BOOST1
33 TG1
32 SW1
31 BOOST2
30 TG2
29 SW2
28 V_DR
27 BG1
26 PGND
25 BG2
24 BG3
23 SW3
22 TG3
21 BOOST3
20 PHASMD
19 SGND2
G PACKAGE
36-LEAD PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 95°C/W, θ_JC = 32°C/W
ORDER PART
NUMBER
LTC3731CG
LTC3731IG
32 31 30 29 28 27 26 25
IN^– 1
24 BOOST2
DIFFOUT 2
EAIN 3
SENSE1⁺ 4
SENSE1^– 5
SENSE2⁺ 6
SENSE2^– 7
SENSE3^– 8
23 TG2
22 SW2
21 V_CC
33
20 BG1
19 PGND
18 BG2
17 BG3
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD PLASTIC QFN
EXPOSED PAD (PIN 33) IS SIGNAL GROUND
(SGND) AND MUST BE SOLDERED TO PCB
T_JMAX = 125°C, θ_JA = 34°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC3731CUH
LTC3731IUH
UH PART
NUMBER
3731
3731I
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = V_RUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
Main Control Loop
V_REGULATED Regulated Voltage at IN⁺
CONDITIONS
V_ITH = 1.2V (Note 3)
LTC3731IG
MIN TYP MAX UNITS
0.596 0.600 0.604
V
● 0.594 0.600 0.606
V
● 0.591
0.609
V
3731fa
2