LTC3853 Datasheet, PDF (3/36 Pages) Linear Technology – Triple Output, Multiphase Synchronous Step-Down Controller

LTC3853
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C, V_IN = 15V, V_RUN1,2,3 = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loops
V_FB1,2,3
I_FB1,2,3
V_REFLNREG
V_LOADREG
g_m1,2,3
I_Q
UVLO
UVLO_HYS
V_OVL
I_SENSE
I_TK/SS1,2,3
V_RUN1,2,3
V_RUN1,2,3HYS
V_SENSE(MAX)
DF_MAX
TG R_UP
TG R_DOWN
BG R_UP
BG R_DOWN
TG1,2,3 t_r
TG1,2,3 t_f
BG1,2,3 t_r
BG1,2,3 t_f
TG/BG t_1D
BG/TG t_2D
t_ON(MIN)
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifier g_m
Input DC Supply Current
Normal Mode
Shutdown
Undervoltage Lockout on INTV_CC
UVLO Hysteresis
Feedback Overvoltage Lockout
Sense Pin Current
Soft-Start Charge Current
RUN Pin ON Threshold
RUN Pin Hysteresis
Maximum Current Sense Threshold
Maximum Duty Factor
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pull-Down On-Resistance
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
Minimum On-Time
I_TH1,2,3 Voltage = 1.2V (Note 4)
I_TH1,2,3 Voltage = 1.2V (0°C to 85°C) (Note 4)
(Note 4)
V_IN = 6V to 24V (Note 4)
(Note 4)
Measured in Servo Loop;
ΔI_TH Voltage = 1.2V to 0.7V
Measured in Servo Loop;
ΔI_TH Voltage = 1.2V to 1.6V
I_TH1,2,3 = 1.2V, Sink/Source 5μA (Note 4)
(Note 5)
V_IN = 15V
V_RUN1,2,3 = 0V
V_INTVCC Ramping Down
Measured at V_FB1,2,3
V_SENSE = 3.3V
V_TK/SS1,2,3 = 0V
V_RUN1, V_RUN2, V_RUN3 Rising
I_TH1,2,3 = 1.85V, V_SENSE1,2,3 = 3.3V, I_LIM = 0V
I_TH1,2,3 = 1.85V, V_SENSE1,2,3 = 3.3V, I_LIM = Float
I_TH1,2,3 = 1.85V, V_SENSE1,2,3 = 3.3V, I_LIM = INTV_CC
In Dropout
TG High
TG Low
BG High
BG Low
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 6)
C_LOAD = 3300pF Each Driver
(Note 6)
C_LOAD = 3300pF Each Driver
(Note 7)
l 0.792 0.800 0.808
V
0.794 0.800 0.806
V
–10 –50
nA
0.002 0.02 %/V
l
0.01 0.1
%
l
–0.01 –0.1
%
2.2
mmho
4.1
mA
42
70
μA
3.35
V
0.5
V
l 0.84 0.86 0.88
V
±1
±2
μA
0.9 1.3 1.7
μA
l 1.1 1.2 1.35
V
80
mV
l 22
30
38
mV
l 42
50
58
mV
l 65
75
85
mV
97
98
%
2.6
Ω
1.5
Ω
2.4
Ω
1.1
Ω
25
ns
25
ns
25
ns
25
ns
30
ns
30
ns
90
ns
3853f
3