LTC3811_15 Datasheet, PDF (4/48 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
I_SENSE
V_CM(CS)
Total Sense Pin Current
(V_SENSE+ + V_SENSE–)
V_SENSE+, V_SENSE– Pin Common Mode
Input Voltage Range
V_CM = 1.25V
Voltage Position Amplifier (QFN Package Only)
g_m
Voltage Position Transconductance,
ΔI_CSOUT/ΔV_SENSE (Note 8)
I_OS(VP)
Output Offset Current, Measured at
CSOUT
Multiphase Oscillator and Phase-Lock Loop (Note 9)
V_SENSE1+ – V_SENSE1– = V_SENSE2+
– V_SENSE2– = ±50mV, V_CM = 1.25V,
V_CSOUT = 1.25V
V_SENSE1+ – V_SENSE1– = V_SENSE2+
– V_SENSE2– = 1.25V, V_CSOUT = 1.25V
f_NOM
Nominal Frequency
V_PLL/LPF Pin Floating, MODE/SYNC = DC
Voltage
f_LOW
Lowest Frequency
f_HIGH
Highest Frequency
V_PLL/LPF = 0V, MODE/SYNC = DC Voltage
V_PLL/LPF = INTV_CC, MODE/SYNC = DC
Voltage
f_SYNC(MIN)
Minimum Synchronizable Frequency MODE/SYNC = External Clock
f_SYNC(MAX)
Maximum Synchronizable Frequency MODE/SYNC = External Clock
I_PLL/LPF
Phase Detector Output Current
Sinking
Sourcing
f_MODE/SYNC < f_OSC
f_MODE/SYNC > f_OSC
θ1 – θ2
Channel 1 to Channel 2 Phase
Relationship (Note 9)
V_PHASMODE = 0V
V_PHASMODE = 50% INTV_CC
V_PHASMODE = INTV_CC
θ1 – θ_CLKOUT
Channel 1 to CLKOUT Phase
Relationship (Note 9)
V_PHASMODE = 0V
V_PHASMODE = 50% INTV_CC
V_PHASMODE = INTV_CC
V_OL(CLKOUT)
Low Level CLKOUT Output Voltage
R_CLK = 50k to Ground
V_OH(CLKOUT)
High Level CLKOUT Output Voltage
R_CLK = 50k to Ground
R_MODE/SYNC
MODE/SYNC Input Resistance
V_{IL(MODE/SYNC)}
Low Level MODE/SYNC Input Threshold
V_{IH(MODE/SYNC)}
High Level MODE/SYNC Input Threshold
Power Good Indicators
V_OL(PGOOD)
I_PGOOD(OFF)
ΔV_FB(OV)
ΔV_FB(UV)
ΔV_FB(HYST)
t_PG(FAULT)
PGOOD Voltage Low
PGOOD Leakage Current
ΔV_FB, PGOOD Overvoltage Threshold
ΔV_FB, PGOOD Undervoltage Threshold
ΔV_FB, PGOOD Comparator Hysteresis
Delay from UV/OV Condition to PGOOD
Falling
I_PGOOD = 2mA
V_PGOOD = 6V
V_FB(OV) – V_FB(NOM) in Percent
V_FB(UV) – V_FB(NOM) in Percent
UV or OV Comparator
t_PG(OK)
Delay from UV/OV Fault Recovery to
PGOOD Rising
Thermal Protection
T_JSD
Thermal Shutdown Junction
(Note 6)
Temperature
T_JSD(HYST)
Thermal Shutdown Junction
Temperature Hysteresis
(Note 6)
MIN TYP MAX UNITS
–1.5
μA
0
3.5
V
5.0
mS
–40
40
μA
450
500
550
kHz
200
250
300
kHz
650
750
850
kHz
125
175
kHz
900 1000
kHz
–4.3
μA
5.1
μA
180
deg
180
deg
120
deg
90
deg
60
deg
240
deg
0.2
V
4.0
5.8
V
75
kΩ
0.3
V
1.8
V
0.12 0.30
V
1.0
μA
7
10
13
%
–13
–10
–7
%
12
mV
145
μs
38
μs
165
°C
25
°C
3811f
4