LTC3826_15 Datasheet, PDF (3/36 Pages) Linear Technology – 30A IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3826
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 = 12V, V_{RUN/SS1, 2} = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loops
V_{FB1, 2}
Regulated Feedback Voltage
(Note 4); I_{TH1, 2} Voltage = 1.2V
l 0.792 0.800 0.808
V
I_{VFB1, 2}
Feedback Current
(Note 4)
–5
–50
nA
V_REFLNREG Reference Voltage Line Regulation V_IN = 4V to 30V (Note 4)
0.002 0.02
%/V
V_LOADREG Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop; ΔI_TH Voltage = 1.2V to 0.7V l
Measured in Servo Loop; ΔITH Voltage = 1.2V to 2V l
0.1
0.5
%
–0.1 –0.5
%
g_{m1, 2}
I_Q
UVLO
V_OVL
I_SENSE
DF_MAX
I_{TRACK/SS1, 2}
V_{RUN1, 2} ON
V_SENSE(MAX)
TG1, 2 t_r
TG1, 2 t_f
BG1, 2 t_r
BG1, 2 t_f
TG/BG t_1D
Transconductance Amplifier g_m
Input DC Supply Current
Sleep Mode (Channel 1 On)
Sleep Mode (Channel 2 On)
Shutdown
Sleep Mode (Both Channels)
Undervoltage Lockout
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Maximum Duty Factor
Soft-Start Charge Current
RUN Pin ON Threshold
Maximum Current Sense Threshold
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
I_{TH1, 2} = 1.2V; Sink/Source 5mA (Note 4)
(Note 5)
RUN1 = 5V, RUN2 = 0V, V_FB1 = 0.83V (No Load)
RUN1 = OV, RUN2 = 5V, V_FB2 = 0.83V (No Load)
V_{RUN1, 2} = 0V
RUN1,2 = 5V, V_FB1 = V_FB2 = 0.83V
V_IN Ramping Down
Measured at V_{FB1, 2}, Relative to Regulated V_{FB1, 2}
(Each Channel) V_SENSE1–, ₂– = V_SENSE1+, ₂+ = 0V
In Dropout
V_{TRACK1, 2} = 0V
V_RUN1, V_RUN2 Rising
V_{FB1, 2} = 0.7V, V_SENSE1–, ₂– = 3.3V
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
C_LOAD = 3300pF Each Driver
l
8
98
0.75
0.5
l 85
0.5
mmho
30
50
μA
30
50
μA
4
10
μA
50
75
μA
3.7
4
V
10
12
%
–220
μA
99.4
%
1
1.35
μA
0.7
0.9
V
100 115
mV
50
90
ns
50
90
ns
40
90
ns
40
80
ns
70
ns
BG/TG t_2D Bottom Gate Off to Top Gate On Delay C_LOAD = 3300pF Each Driver
Top Switch-On Delay Time
70
ns
t_ON(MIN)
Minimum On-Time
INTV_CC Linear Regulator
V_INTVCCVIN Internal V_CC Voltage
V_LDOVIN
INTV_CC Load Regulation
V_INTVCCEXT Internal V_CC Voltage
V_LDOEXT
INTV_CC Load Regulation
V_EXTVCC
EXTV_CC Switchover Voltage
V_LDOHYS
EXTV_CC Hysteresis
Oscillator and Phase-Locked Loop
(Note 7)
8.5V < V_IN < 30V, V_EXTVCC = 0V
I_CC = 0mA to 20mA, V_EXTVCC = 0V
V_EXTVCC = 8.5V
I_CC = 0mA to 20mA, V_EXTVCC = 8.5V
EXTV_CC Ramping Positive
230
ns
5.0 5.25 5.5
V
0.2
1.0
%
7.2
7.5
7.8
V
0.2
1.0
%
4.5
4.7
V
0.2
V
f_NOM
f_LOW
f_HIGH
f_SYNCMIN
f_SYNCMAX
Nominal Frequency
Lowest Frequency
Highest Frequency
Minimum Synchronizable Frequency
Maximum Synchronizable Frequency
V_PLLLPF = Floating; PLLIN/MODE = DC Voltage
V_PLLLPF = 0V; PLLIN/MODE = DC Voltage
V_PLLLPF = INTV_CC; PLLIN/MODE = DC Voltage
PLLIN/MODE = External Clock; V_PLLLPF = 0V
PLLIN/MODE = External Clock; V_PLLLPF = 2V
350 390 430
kHz
220 250 280
kHz
475 530 585
kHz
115 140
kHz
650 800
kHz
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