LTC3865-1_15 Datasheet, PDF (4/38 Pages) Linear Technology – Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

LTC3865/LTC3865-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). V_IN = 15V, V_RUN1,2 = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loops
V_IN
Input Voltage
V_OSENSE1,2 Output Voltage Sensing (E-Grade)
Output Voltage Sensing (I-Grade)
I_OSENSE1,2
V_REFLNREG
V_LOADREG
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
g_m1,2
I_Q
UVLO
UVLO_HYS
V_OVL
I_SENSE
DF_MAX
I_TK/SS1,2
V_RUN1,2
V_RUN1,2HYS
I_RUN1,2HYS
V_SENSE(MAX)
Transconductance Amplifier g_m
Input DC Supply Current
Normal Mode
Shutdown
Undervoltage Lockout on INTV_CC
UVLO Hysteresis
Feedback Overvoltage Lockout
Sense Pins Total Current
Maximum Duty Cycle
Soft-Start Charge Current
RUN Pin On Threshold
RUN Pin On Hysteresis
RUN Pin Current Hysteresis
Maximum Current Sense Threshold
(E-Grade)
4.5
(Note 4) I_TH1,2 Voltage = 1.2V
VID11 = VID21 = GND, VID12 = VID22 = GND
VID11 = VID21 = GND, VID12 = VID22 = Float
VID11 = VID21 = GND, VID12 = VID22 = INTV_CC
VID11 = VID21 = Float, VID12 = VID22 = GND
VID11 = VID21 = Float, VID12 = VID22 = Float
VID11 = VID21 = Float, VID12 = VID22 = INTV_CC
VID11 = VID21 = INTV_CC, VID12 = VID22 = GND
VID11 = VID21 = INTV_CC, VID12 = VID22 = Float
VID11 = VID21 = INTV_CC, VID12 = VID22 = INTV_CC
(Note 4) I_TH1,2 Voltage = 1.2V
VID11 = VID21 = GND, VID12 = VID22 = GND
VID11 = VID21 = GND, VID12 = VID22 = Float
VID11 = VID21 = GND, VID12 = VID22 = INTV_CC
VID11 = VID21 = Float, VID12 = VID22 = GND
VID11 = VID21 = Float, VID12 = VID22 = Float
VID11 = VID21 = Float, VID12 = VID22 = INTV_CC
VID11 = VID21 = INTV_CC, VID12 = VID22 = GND
VID11 = VID21 = INTV_CC, VID12 = VID22 = Float
VID11 = VID21 = INTV_CC, VID12 = VID22 = INTV_CC
(Note 4) VID11 = VID21 = VID12 = VID22 = Float
l 1.089
l 0.990
l 1.188
l 1.485
l 0.596
l 1.782
l 2.463
l 3.251
l 4.925
l 1.084
l 0.985
l 1.182
l 1.478
l 0.593
l 1.773
l 2.450
l 3.234
l 4.900
V_IN = 4.5V to 38V (Note 4)
(Note 4)
Measured in Servo Loop; ΔI_TH Voltage = 1.2V to 0.7V l
Measured in Servo Loop; ΔI_TH Voltage = 1.2V to 1.6V l
I_TH1,2 = 1.2V; Sink/Source 5μA; (Note 4)
(Note 5)
V_IN = 15V
V_RUN1,2 = 0V
V_INTVCC Ramping Down
Measured at V_OSENSE1,2 with VID Pins Floating
(Each Channel); V_SENSE1,2 = 3.3V
In Dropout
V_TK/SS1,2 = 0V
V_RUN1, V_RUN2 Rising
l 0.64
94
0.9
l 1.1
V_ITH1,2 = 3.3V, I_LIM = 0V
V_ITH1,2 = 3.3V, I_LIM = Float (Note 8)
V_ITH1,2 = 3.3V, I_LIM = INTV_CC
In Overvoltage Condition
l 24
l 44
l 68
l –63
1.100
1.000
1.200
1.500
0.602
1.800
2.500
3.300
5.000
1.100
1.000
1.200
1.500
0.602
1.800
2.500
3.300
5.000
–10
0.002
0.01
–0.01
2.2
3
30
3.3
0.55
0.66
±1
95
1.3
1.22
80
4.5
30
50
75
–53
38
1.111
1.010
1.212
1.515
0.608
1.818
2.538
3.350
5.075
1.117
1.015
1.218
1.523
0.611
1.827
2.550
3.366
5.100
–50
0.02
0.1
–0.1
50
0.68
±2
1.7
1.35
36
56
82
–43
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
nA
%/V
%
%
mmho
mA
μA
V
V
V
μA
%
μA
V
mV
μA
mV
mV
mV
mV
Maximum Current Sense Threshold
(I-Grade)
V_ITH1,2 = 3.3V, I_LIM = 0V
V_ITH1,2 = 3.3V, I_LIM = Float (Note 8)
V_ITH1,2 = 3.3V, I_LIM = INTV_CC
In Overvoltage Condition
l 22
30
38
mV
l 42
50
58
mV
l 66
75
84
mV
l –65 –53 –41
mV
TG R_UP
TG R_DOWN
BG R_UP
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
TG High
TG Low
BG High
2.6
Ω
1.5
Ω
3
Ω
3865fb
4