LTC3709 Datasheet, PDF (3/24 Pages) Linear Technology – Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing

LTC3709
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = DRV_CC = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
V_SENSE(MAX) Maximum Current Sense Threshold
V_SENSE(MIN) Minimum Current Sense Threshold
∆V_FB(OV)
∆V_FB(UV)
V_RUN/SS(ON)
V_RUN/SS(LE)
V_RUN/SS(LT)
I_RUN/SS(C)
I_RUN/SS(D)
UVLO
TG R_UP
TG R_DOWN
BG R_UP
BG R_DOWN
Tracking
Overvoltage Fault Threshold
Undervoltage Fault Threshold
RUN Pin Start Threshold
RUN Pin Latchoff Enable Threshold
RUN Pin Latchoff Threshold
Soft-Start Charge Current
Soft-Start Discharge Current
Undervoltage Lockout
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pull-Down On-Resistance
V_RNG = 1V
V_RNG = 0V
V_RNG = V_CC
V_RNG = 1V
V_RNG = 0V
V_RNG = V_CC
RUN/SS Pin Rising
RUN/SS Pin Falling
Measured at V_CC Pin
TG High
TG Low
BG High
BG Low
124
86
177
8.5
– 8.5
● 0.8
– 0.5
0.8
144 166
101 119
202 234
– 60
– 40
– 80
10
12.5
– 10 – 12.5
1.4
2
3
2.3
– 1.2
–3
2
4
3.9
4.2
2
1.5
3
1.5
I_TRACK
V_FB(TRACK)
TRACK Pin Input Current
Feedback Voltage at Tracking
PGOOD Output
I_TH = 1.2V, V_TRACK = 0.2V (Note 3)
V_TRACK = 0.1V, I_TH = 1.2V (Note 3)
V_TRACK = 0.3V, I_TH = 1.2V (Note 3)
V_TRACK = 0.5V, I_TH = 1.2V (Note 3)
–100 –150
90
100 110
290 300 310
490 500 510
∆V_FBH
∆V_FBL
PG Delay
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Delay
∆V_FB(HYS)
PGOOD Hysteresis
I_PGOOD
PGOOD Leakage Current
V_PGL
PGOOD Low Voltage
Phase-Lock Loop
V_FB Rising
V_FB Falling
V_FB Falling
V_FB Returning
V_PGOOD = 7V
I_PGOOD = 5mA
8.5
10
12.5
– 8.5 – 10 – 12.5
100
3.5
±1
0.2
0.4
I_{INTPLL_SOURCE}
I_{INTPLL_SINK}
I_{EXTPLL_SOURCE}
I_{EXTPLL_SINK}
V_FCB(DC)
V_FCB(AC)
t_ON(PLL)1
t_ON(PLL)2
Internal PLL Sourcing Current
Internal PLL Sinking Current
External PLL Sourcing Current
External PLL Sinking Current
Forced Continuous Threshold
Clock Input Threshold
t_ON1 Modulation Range by External PLL
Up Modulation
Down Modulation
t_ON2 Modulation Range by Internal PLL
Up Modulation
Down Modulation
Measured with a DC Voltage at FCB Pin
Measured with a AC Pulse at FCB Pin
I_ON1 = 180µA, V_EXTPLL = 1.8V
I_ON1 = 180µA, V_EXTPLL = 0.6V
I_ON2 = 180µA, V_INTPLL = 1.8V
I_ON2 = 180µA, V_INTPLL = 0.6V
20
– 20
20
– 20
1.9
2.1
2.3
1
1.5
2
186 233
58
80
186 233
58
80
UNITS
mV
mV
mV
mV
mV
mV
%
%
V
V
V
µA
µA
V
Ω
Ω
Ω
Ω
nA
mV
mV
mV
%
%
µs
%
µA
V
µA
µA
µA
µA
V
V
ns
ns
ns
ns
3709f
3