LTC3811_15 Datasheet, PDF (3/48 Pages) Linear Technology – High Speed Dual, Multiphase Step-Down DC/DC Controller

LTC3811
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_J = 25°C. V_IN = 12V, MODE/SYNC = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Supply
V_IN
Operating Input Voltage Range
I_Q
Total Quiescent Supply Current
Continuous Mode (Note 4)
Shutdown Mode
RUN Pin ON/OFF Control
I_RUN
RUN Pin Input Leakage
V_IL(RUN)
Low Level RUN Input Threshold
V_IH(RUN)
High Level RUN Input Threshold
Error Amplifier Characteristics (Both Channels)
V_FB1, V_FB2
Feedback Voltage Accuracy
V_FB1,2 = 0.7V
V_RUN1,2 = 0V
V_RUN1,2 = 3.3V
(Note 5)
4.5
30
V
●
10.5
20
mA
●
20
40
μA
–1
1
μA
0.3
V
1.8
V
598
600
602
mV
● 597
603
mV
I_FB1, I_FB2
ΔV_FB/ΔV_IN
ΔV_FB/ΔV_COMP
f_0dB(EA)
Feedback Pin Input Current
Line Regulation
Load Regulation
Error Amplifier Unity Gain Crossover
Frequency
V_COMP = 1.25V (Note 5)
4.5V ≤ V_IN ≤ 30V (Note 5)
ΔV_COMP = 1.25V to 1.5V (Note 5)
(Note 6)
–100
100
nA
●
0.002 0.02
%/V
● –0.1 –0.01
%
8
MHz
V_OH(EA)
V_OL(EA)
V_FB(OFF)
Soft-Start/Tracking
I_SS1, I_SS2
Error Amplifier Maximum Output
Voltage (Internally Clamped)
V_FB = 0.54V, No Load
Error Amplifier Minimum Output Voltage V_FB = 0.66V, No Load
FB Voltage Threshold to Disable Error V_INTVCC – V_FB
Amplifier Output
SS/TRACK1, SS/TRACK2 Charging
Currents
V_SS/TRACK1 = V_SS/TRACK2 = 0.3V
2.6
V
10
mV
0.3
V
–2.5
μA
R_SS1, R_SS2
SS/TRACK1, SS/TRACK2 Pull-Down
Resistance in Shutdown
V_RUN1 = V_RUN2 = 0V
1
kΩ
Differential Amplifier
A_V
V_OS(DIFF)
R_IN
PSRR_DIFF
V_DM(DIFF)
Differential Mode Gain,
ΔV_DIFF/OUT/ΔV_DIFF/IN
Output Offset Voltage,
V_DIFF/OUT – V_DIFF/IN+
Input Resistance
Power Supply Rejection Ratio
Maximum Differential Mode Input
Voltage
I_MAX+
Maximum Sink Current
I_MAX–
Maximum Source Current
f_0dB(DIFF)
Unity Gain Bandwidth
Current Comparators
ΔV_DIFF/IN = 1V to 3.5V, I_DIFF/OUT = –100μA
V_DIFF/IN+ = 1.25V, V_DIFF/IN– = 0V,
I_DIFF/OUT = –100μA
Measured at V_DIFF/IN+
7V ≤ V_IN ≤ 30V
V_DIFF/IN+ – V_DIFF/IN–, Measured at
V_DIFF/OUT, I_DIFF/OUT = –100μA
(Note 6)
0.995 1.000 1.005
V/V
–6
6
mV
160
kΩ
100
dB
5.5
V
2
mA
–2
mA
8
MHz
V_SENSE(MAX)
V_SENSE(MIN)
Maximum Current Sense Threshold
(V_SENSE+ – V_SENSE–)
Minimum Current Sense Threshold
(V_SENSE+ – V_SENSE–)
V_FB = 0.575V, V_CM = 1.25V
V_RNG = 0V
V_RNG = INTV_CC
V_RNG = 2V
V_FB = 0.625V, V_CM = 1.25V
V_RNG = 0V
V_RNG = INTV_CC
V_RNG = 2V
14
24
34
mV
32.5
50
67.5
mV
60
85
110
mV
–21
mV
–41
mV
–67
mV
3811f
3