LTC3890-2 Datasheet, PDF (3/40 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

LTC3890-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C. V_IN = 12V, V_RUN1,2 = 5V, EXTV_CC = 0V unless otherwise noted.
(Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_IN
V_OUT
V_FB1,2
Input Supply Operating Voltage Range
Regulated Output Voltage Range
Regulated Feedback Voltage
(Note 4) I_TH1,2 Voltage = 1.2V
–40°C to 85°C, All Grades
LTC3890E-2, LTC3890I-2
LTC3890H-2, LTC3890MP-2
4
60
V
0.8
24
V
0.792 0.800 0.808
V
l 0.788 0.800 0.812
V
l 0.786 0.800 0.812
V
I_FB1,2
V_REFLNREG
V_LOADREG
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
g_m1,2
I_Q
Transconductance Amplifier g_m
Input DC Supply Current
Pulse-Skipping or Forced Continuous
Mode (One Channel On)
Pulse-Skipping or Forced Continuous
Mode (Both Channels On)
(Note 4)
(Note 4) V_IN = 4.5V to 60V
(Note 4)
Measured in Servo Loop,
Δ_ITH Voltage = 1.2V to 0.7V
(Note 4)
Measured in Servo Loop,
Δ_ITH Voltage = 1.2V to 2V
(Note 4) I_TH1,2 = 1.2V, Sink/Source = 5μA
(Note 5)
RUN1 = 5V and RUN2 = 0V, V_FB1 = 0.83V or
RUN1 = 0V and RUN2 = 5V, V_FB2 = 0.83V
RUN1,2 = 5V, V_FB1,2 = 0.83V (No Load)
±5 ±50
nA
0.002 0.02 %/V
l
0.01 0.1
%
l
–0.01 –0.1
%
2
mmho
1.3
mA
2
mA
Sleep Mode (One Channel On)
Sleep Mode (Both Channels On)
Shutdown
RUN1 = 5V and RUN2 = 0V, V_FB1 = 0.83V (No Load) or
RUN1 = 0V and RUN2 = 5V, V_FB2 = 0.83V (No Load)
RUN1,2 = 5V, V_FB1,2 = 0.83V (No Load)
RUN1,2 = 0V
50
75
μA
60 100
μA
14
25
μA
UVLO
I_SENSE+
I_SENSE–
Undervoltage Lockout
SENSE⁺ Pin Current
SENSE^– Pins Current
Maximum TG1, 2 Duty Factor
INTV_CC Ramping Up
INTV_CC Ramping Down
Each Channel
Each Channel
VV^{SSEENNSSEE––}
<
>
INTV_CC
INTV_CC
–
+
0.5V
0.5V
In Dropout
l
3.92 4.2
V
l 3.6 3.80 4.0
V
±1
μA
±1
μA
700
μA
98
99
%
I_TRACK/SS1,2
V_RUN1
V_RUN2
Soft-Start Charge Current
RUN1 Pin On Threshold
RUN2 Pin On Threshold
RUN1,2 Pin Hysteresis
V_TRACK/SS1,2 = 0V
V_RUN1 Rising
V_RUN2 Rising
0.7 1.0 1.4
μA
l 1.15 1.21 1.27
V
l 1.20 1.25 1.30
V
50
mV
V_SENSE(MAX) Maximum Current Sense Threshold
V_FB1,2 = 0.7V, V_SENSE1–,₂– = 3.3V, I_LIM = 0
V_FB1,2 = 0.7V, V_SENSE1–,₂– = 3.3V, I_LIM = INTV_CC
V_FB1,2 = 0.7V, V_SENSE1–,₂– = 3.3V, I_LIM = FLOAT
l 22
30
36
mV
l 43
50
57
mV
l 64
75
85
mV
38902f
3