LTC3826-1 Datasheet, PDF (3/32 Pages) Linear Technology – 30μA IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3826-1
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
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; ΔI_TH Voltage = 1.2V to 2V l
g_{m1, 2}
Transconductance Amplifier g_m
I_{TH1, 2} = 1.2V; Sink/Source 5μA (Note 4)
I_Q
Input DC Supply Current
(Note 5)
Sleep Mode (Channel 1 On)
RUN1 = 5V, RUN2 = 0V, V_FB1 = 0.83V (No Load)
Sleep Mode (Channel 2 On)
RUN1 = OV, RUN2 = 5V, V_FB2 = 0.83V (No Load)
Shutdown
V_{RUN1, 2} = 0V
Sleep Mode (Both Channels)
RUN1,2 = 5V, V_FB1 = V_FB2 = 0.83V
UVLO
Undervoltage Lockout
V_IN Ramping Down
l
V_OVL
Feedback Overvoltage Lockout
Measured at V_{FB1, 2}, Relative to Regulated V_{FB1, 2}
8
I_SENSE
Sense Pins Total Source Current
(Each Channel) V_SENSE1–, ₂– = V_SENSE1+, ₂+ = 0V
DF_MAX
Maximum Duty Factor
In Dropout
98
I_{TRACK/SS1, 2} Soft-Start Charge Current
V_{TRACK1, 2} = 0V
0.75
V_{RUN1, 2} ON RUN Pin ON Threshold
V_RUN1, V_RUN2 Rising
0.5
V_SENSE(MAX) Maximum Current Sense Threshold V_{FB1, 2} = 0.7V, V_SENSE1–, ₂– = 3.3V
l 85
TG Transition Time:
(Note 6)
TG1, 2 t_r
TG1, 2 t_f
Rise Time
Fall Time
C_LOAD = 3300pF
C_LOAD = 3300pF
BG Transition Time:
(Note 6)
BG1, 2 t_r
BG1, 2 t_f
Rise Time
Fall Time
C_LOAD = 3300pF
C_LOAD = 3300pF
TG/BG t_1D
Top Gate Off to Bottom Gate On Delay C_LOAD = 3300pF Each Driver
Synchronous Switch-On Delay Time
BG/TG t_2D
Bottom Gate Off to Top Gate On Delay C_LOAD = 3300pF Each Driver
Top Switch-On Delay Time
t_ON(MIN)
Minimum On-Time
(Note 7)
INTV_CC Linear Regulator
V_INTVCCVIN Internal V_CC Voltage
8.5V < V_IN < 30V, V_EXTVCC = 0V
5.0
V_LDOVIN
INTV_CC Load Regulation
I_CC = 0mA to 20mA, V_EXTVCC = 0V
V_INTVCCEXT Internal V_CC Voltage
V_EXTVCC = 8.5V
7.2
V_LDOEXT
INTV_CC Load Regulation
I_CC = 0mA to 20mA, V_EXTVCC = 8.5V
V_EXTVCC
EXTV_CC Switchover Voltage
EXTV_CC Ramping Positive
4.5
V_LDOHYS
EXTV_CC Hysteresis
Oscillator and Phase-Locked Loop
f_NOM
Nominal Frequency
V_PLLLPF = Floating; PLLIN/MODE = DC Voltage
350
f_LOW
Lowest Frequency
V_PLLLPF = 0V; PLLIN/MODE = DC Voltage
220
f_HIGH
Highest Frequency
V_PLLLPF = INTV_CC; PLLIN/MODE = DC Voltage
475
f_SYNCMIN
Minimum Synchronizable Frequency PLLIN/MODE = External Clock; V_PLLLPF = 0V
f_SYNCMAX
Maximum Synchronizable Frequency PLLIN/MODE = External Clock; V_PLLLPF = 2V
650
I_PLLLPF
Phase Detector Output Current
Sinking Capability
Sourcing Capability
f_PLLIN/MODE < f_OSC
f_PLLIN/MODE > f_OSC
PGOOD Output
V_PGL
PGOOD Voltage Low
I_PGOOD = 2mA
I_PGOOD
PGOOD Leakage Current
V_PGOOD = 5V
V_PG
PGOOD Trip Level
V_FB with Respect to Set Regulated Voltage
V_FB Ramping Negative
–12
V_FB Ramping Positive
8
TYP MAX UNITS
0.1
0.5
%
–0.1 –0.5
%
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
70
ns
230
ns
5.25 5.5
V
0.2
1.0
%
7.5
7.8
V
0.2
1.0
%
4.7
V
0.2
V
390 430
kHz
250 280
kHz
530 585
kHz
115 140
kHz
800
kHz
–5
μA
5
μA
0.1
0.3
V
±1
μA
–10
–8
%
10
12
%
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