LTC3708 LINER [Linear Technology], LTC3708 Datasheet - Page 3

• Manufacturer Part Number: LTC3708
• Description: Fast 2-Phase, No RSENSE Buck Controller with Output Tracking
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
ΔV
g
t
t
t
V
V
ΔV
ΔV
V
V
V
I
I
V
V
TG R
TG R
BG R
BG R
Tracking
I
V
PGOOD Output
ΔV
ΔV
ΔV
V
I
PG Delay
Phase-Locked Loops
V
V
I
ON1,2
ON(MIN)1,2
OFF(MIN)1,2
RUN/SS(C)
RUN/SS(D)
TRACK1,2
PGOOD
EXTLPF
m(EA)1,2
SENSE(MAX)1,2
SENSE(MIN)1,2
RUN/SS(ON)
RUN/SS(LE)
RUN/SS(LT)
CC(UVLO)
CC(UVLOR)
FB(TRACK1,2)
PGL
FCB(DC)
FCB(AC)
FB(LOADREG)1,2
FB(OV)1,2
FB(UV)1,2
FBH1,2
FBL1,2
FB(HYS)1,2
UP1,2
DOWN1,2
UP1,2
DOWN1,2
PARAMETER
Feedback Voltage Load Regulation
Error Amplifi er Transconductance
On-Time
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold
Minimum Current Sense Threshold
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
TRACK Pin Input Current
Feedback Voltage at Tracking
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Leakage Current
PGOOD Delay
Forced Continuous Threshold
Clock Input Threshold
External Phase Detector Output Current
Sourcing Capability
Sinking Capability
A
CONDITIONS
I
I
I
I
I
I
V
V
V
V
V
V
RUN/SS Pin Rising
RUN/SS Pin Falling
V
V
V
V
TG High (Note 6)
TG Low (Note 6)
BG High (Note 6)
BG Low (Note 6)
I
V
V
V
Either V
Either V
V
I
V
V
Measured with a DC Voltage at FCB Pin
Measured with a AC Pulse at FCB Pin
f
f
= 25°C. V
TH
TH
ON
ON
ON
ON
TH
PGOOD
FCB
FCB
TRACK
TRACK
TRACK
RNG
RNG
RNG
RNG
RNG
RNG
RUN/SS
RUN/SS
CC
CC
FB
PGOOD
FB
= 0.5V to 1.9V (Note 3)
= 1.2V (Note 3)
= 1.2V, V
= 60μA, V
= 30μA, V
= 180μA
= 30μA
Returning
Falling
Falling
Rising
< f
> f
= 1V, V
= 0V, V
= VCC, V
= 1V, V
= 0V, V
= V
The
SW1
SW1
= 5mA
= 0V, I
= 0.2V, I
= 0.4V, I
FB
FB
= 7V
= 0V
= V
CC
Rising
Falling
l
, V
, V
CC
, V
RUN/SS(LE)
TRACK
FB
FB
FB
FB
denotes the specifi cations which apply over the full operating
FCB
FCB
TH
EXTLPF
EXTLPF
FB
= 5V, DRV
FB
= 0.565V
= 0.565V
= 0.635V
= 0.635V
TH
TH
= 1.2V (Note 3)
= 0.635V
= 0.565V
= 0V
= 0V
= 0.2V (Note 3)
= 1.2V (Note 3)
= 1.2V (Note 3)
= 0V
= 2.4
, V
FB1,2
CC
= 5V, unless otherwise noted.
= 0V
l
l
–380
–0.5
–8.5
MIN
186
125
180
–10
190
390
100
1.2
8.5
0.8
2.6
2.2
0.8
8.5
1.9
94
90
1
–0.05
–420
–100
1.45
–1.2
TYP
116
233
270
143
100
200
–62
–42
–88
200
400
–10
–20
1.3
2.5
3.2
3.5
0.1
2.1
1.5
50
10
10
3
2
2
2
3
1
0
3
20
LTC3708
–11.5
MAX
–460
–150
–0.2
11.5
11.5
138
280
350
160
110
220
–10
210
410
1.7
1.8
3.3
2.8
3.6
3.8
0.4
2.3
85
–2
±1
3
5
2
UNITS
3708fb
3
mS
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
μA
μA
nA
μA
μA
μA
ns
ns
ns
ns
μs
%
%
%
%
%
Ω
Ω
Ω
Ω
V
V
V
V
V
V
V
V