LTC3866 Datasheet, PDF (3/36 Pages) Linear Technology – Current Mode Synchronous Controller for Sub Milliohm DCR Sensing

LTC3866
Electrical Characteristics The l denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at T_A = 25°C (Note 2). V_IN = 15V, V_RUN = 5V unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
Main Control Loops
V_IN
Input Voltage Range
V_OUT
Output Voltage Range
with Diffamp in Loop
V_FB
Regulated Feedback Voltage Current ITH Voltage = 1.2V (Note 5)
–40°C to 85°C
l
–40°C to 125°C
l
I_FB
V_REFLNREG
Feedback Current
Reference Voltage Line
Regulation
(Note 5)
V_IN = 4.5V to 38V (Note 5)
V_LOADREG Output Voltage Load
Regulation
(Note 5)
Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V l
Measured in Servo Loop; ∆ITH Voltage = 1.2V to 1.6V l
g_m
Error Amplifier (EA)
Transconductance
ITH =1.2V, Sink/Source 5µA (Note 5)
I_Q
Input DC Supply Current
(Note 6)
Normal Mode
V_IN = 15V
Shutdown
V_IN = 15V, V_RUN = 0V
UVLO
Undervoltage Lockout
V_INTVCC Ramping Down
UVLO_HYS UVLO Hysteresis Voltage
V_FBOVL
Feedback Overvoltage Lockout Measured at V_FB
l
I_SNSD+
SNSD⁺ Pin Bias Current
V_SNSD+ = 3.3V
l
I_SNSA+
SNSA⁺ Pin Bias Current
V_SNSA+ = 3.3V
l
A_{VT_SNS}
Total Sense Signal Gain to
Current Comparator
(V_SNSD+ + V_SNSA+)/V_SNSD+
V_SENSE(MAX) Maximum Current Sense
–40°C to 85°C
Threshold
V_SNS– = 1.8V, ILIM = 0V
l
ILIM = 1/4 V_INTVCC
l
ILIM = 1/2 V_INTVCC or Float
l
ILIM = 3/4 V_INTVCC
l
ILIM = V_INTVCC
l
–40°C to 125°C
V_SNS– = 1.8V, ILIM = 0V
l
ILIM = 1/4V_INTVCC
l
ILIM = 1/2V_INTVCC or Float
l
ILIM = 3/4V_INTVCC
l
ILIM = V_INTVCC
l
I_TEMP
DCR Temperature
V_ITEMP = 0.3V
l
Compensation Current
I_TK/SS
Soft-Start Charge Current
V_TK/SS = 0V
l
V_RUN
RUN Pin On Threshold Voltage V_RUN Rising
l
V_RUN(HYS) RUN Pin On Hysteresis
Voltage
TG
Top Gate (TG) Transition Time
t_r
Rise Time
t_f
Fall Time
(Note 7)
C_LOAD = 3300pF
C_LOAD = 3300pF
BG
Bottom Gate (BG) Transition
t_r
Time
t_f
Rise Time
Fall Time
(Note 7)
C_LOAD = 3300pF
C_LOAD = 3300pF
MIN
4.5
0.6
0.597
0.5955
3.4
0.64
9.2
14.2
19.2
23.5
28.5
9
14
19
23.5
28.5
9
1.0
1.1
TYP
0.6
0.6
–15
0.002
0.01
0.01
2
3.2
30
3.75
0.5
0.66
30
1
5
10
15
20
25
30
10
15
20
25
30
10
1.25
1.22
80
25
25
25
25
MAX UNITS
38
V
3.5
V
0.603
V
0.6045
V
–50
nA
0.02
%
0.1
%
0.1
%
mmho
mA
50
µA
4.1
V
V
0.68
V
100
nA
2
µA
V/V
10.8
mV
15.8
mV
20.8
mV
26.5
mV
31.5
mV
11
mV
16
mV
21
mV
26.5
mV
31.5
mV
11
µA
1.5
µA
1.35
V
mV
ns
ns
ns
ns
3866fa
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