LTC3708_15 Datasheet, PDF (3/32 Pages) Linear Technology – Fast 2-Phase, No RSENSE Buck Controller with Output Tracking

LTC3708
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 5V, DRV_CC = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
ΔV_{FB(LOADREG)1,2} Feedback Voltage Load Regulation
g_m(EA)1,2
Error Amplifier Transconductance
t_ON1,2
On-Time
t_ON(MIN)1,2
t_OFF(MIN)1,2
V_{SENSE(MAX)1,2}
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold
V_{SENSE(MIN)1,2} Minimum Current Sense Threshold
ΔV_FB(OV)1,2
ΔV_FB(UV)1,2
V_RUN/SS(ON)
V_RUN/SS(LE)
V_RUN/SS(LT)
I_RUN/SS(C)
I_RUN/SS(D)
V_CC(UVLO)
V_CC(UVLOR)
TG R_UP1,2
TG R_DOWN1,2
BG R_UP1,2
BG R_DOWN1,2
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
Undervoltage Lockout Release
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pull-Down On-Resistance
I_TH = 0.5V to 1.9V (Note 3)
I_TH = 1.2V (Note 3)
I_ON = 60μA, V_FCB = 0V
I_ON = 30μA, V_FCB = 0V
I_ON = 180μA
I_ON = 30μA
V_RNG = 1V, V_FB = 0.565V
V_RNG = 0V, V_FB = 0.565V
V_RNG = VCC, V_FB = 0.565V
V_RNG = 1V, V_FB = 0.635V
V_RNG = 0V, V_FB = 0.635V
V_RNG = V_CC, V_FB = 0.635V
RUN/SS Pin Rising
RUN/SS Pin Falling
V_RUN/SS = 0V
V_RUN/SS = V_RUN/SS(LE), V_FB1,2 = 0V
V_CC Falling
V_CC Rising
TG High (Note 6)
TG Low (Note 6)
BG High (Note 6)
BG Low (Note 6)
l
1.2
94
186
125
90
180
8.5
–380
l
0.8
2.6
2.2
–0.5
0.8
–0.05
–0.2
1.45
1.7
116
138
233
280
50
85
270
350
143
160
100
110
200
220
–62
–42
–88
10
11.5
–420
–460
1.3
1.8
3
3.3
2.5
2.8
–1.2
–2
2
3
3.2
3.6
3.5
3.8
2
2
3
1
I_TRACK1,2
V_FB(TRACK1,2)
TRACK Pin Input Current
Feedback Voltage at Tracking
PGOOD Output
I_TH = 1.2V, V_TRACK = 0.2V (Note 3)
V_TRACK = 0V, I_TH = 1.2V (Note 3)
V_TRACK = 0.2V, I_TH = 1.2V (Note 3)
V_TRACK = 0.4V, I_TH = 1.2V (Note 3)
–100
–150
–10
0
–10
190
200
210
390
400
410
ΔV_FBH1,2
ΔV_FBL1,2
ΔV_FB(HYS)1,2
V_PGL
I_PGOOD
PG Delay
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Leakage Current
PGOOD Delay
Phase-Locked Loops
Either V_FB Rising
Either V_FB Falling
V_FB Returning
I_PGOOD = 5mA
V_PGOOD = 7V
V_FB Falling
8.5
10
11.5
–8.5
–10
–11.5
3
5
0.1
0.4
±1
100
V_FCB(DC)
V_FCB(AC)
I_EXTLPF
Forced Continuous Threshold
Clock Input Threshold
External Phase Detector Output Current
Sourcing Capability
Sinking Capability
Measured with a DC Voltage at FCB Pin
Measured with a AC Pulse at FCB Pin
f_FCB < f_SW1, V_EXTLPF = 0V
f_FCB > f_SW1, V_EXTLPF = 2.4
1.9
2.1
2.3
1
1.5
2
20
–20
UNITS
%
mS
ns
ns
ns
ns
mV
mV
mV
mV
mV
mV
%
mV
V
V
V
μA
μA
V
V
Ω
Ω
Ω
Ω
nA
mV
mV
mV
%
%
%
V
μA
μs
V
V
μA
μA
3708fb
3