LTC3731H Datasheet, PDF (2/32 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731H
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 Junction
Temperature Range (Note 2) .................–40°C to 140°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature G Package (Soldering, 10sec).. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V_CC 1
PLLIN 2
PLLFLTR 3
FCB 4
NC 5
NC 6
NC 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 SGND
G PACKAGE
36-LEAD PLASTIC SSOP
T_JMAX = 140°C, θ_JA = 95°C/W, θ_JC = 32°C/W
PINS 5 AND 6 CAN BE GROUNDED OR NC
PIN 7 MUST BE LEFT AS NC
ORDER PART
NUMBER
LTC3731HG
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 EAIN
CONDITIONS
V_ITH = 1.2V (Note 3)
V_SENSEMAX
I_MATCH
V_LOADREG
V_REFLNREG
g_m
g_mOL
V_FCB
Maximum Current Sense Threshold
Maximum Current Threshold Match
Output Voltage Load Regulation
Output Voltage Line Regulation
Transconductance Amplifier g_m
Transconductance Amplifier GBW
Forced Continuous Threshold
V_EAIN = 0.5V, V_ITH Open,
V_SENSE1–_, V_SENSE2–_, V_SENSE3– = 0.6V, 1.8V
Worst-Case Error at V_SENSEMAX
(Note 3)
Measured in Servo Loop, ∆I_TH Voltage = 1.2V to 0.7V
Measured in Servo Loop, ∆I_TH Voltage = 1.2V to 2V
V_CC = 4.5V to 7V
I_TH = 1.2V, Sink/Source 25µA (Note 3)
I_TH = 1.2V (g_m • Z_L, Z_L = Series 1k-100kΩ-1nF)
MIN
0.594
● 0.590
65
● 60
–5
●
●
●3
● 0.54
TYP
0.600
0.600
75
75
0.1
– 0.1
0.03
5
3
0.60
MAX UNITS
0.606
V
0.614
V
85
mV
90
mV
5
%
0.7
%
– 0.7
%
%/V
7 mmho
MHz
0.66
V
3731hf
2