Datasheet

LTC3860
3
3860fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are at T
A
= 25°C (Note 3). V
CC
= 5V, V
RUN1,2
= 5V, V
FREQ
= V
CLKIN
= 0V, V
FB
= 0.6V,
f
OSC
= 0.6MHz unless otherwise specifi ed.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
SS
Soft-Start Pin Output Current V
SS
= 0V 2.5 μA
t
SS(INTERNAL)
Internal Soft-Start Time 2ms
V
FB
Regulated Feedback Voltage 0°C to 85°C
–40°C to 85°C
–40°C to 125°C
l
595.5
594
592.5
600
600
600
604.5
606
607.5
mV
mV
mV
ΔV
FB
/ΔV
CC
Regulated Feedback Voltage Line
Dependence
3.0V < V
CC
< 5.5V 0.05 0.2 %/V
I
LIMIT
I
LIM
Pin Output Current V
ILIM
= 0.8V 18 20 22 μA
Power Good
V
FB(OV)
PGOOD/V
FB
Overvoltage Threshold V
FB
Falling
V
FB
Rising 650
645
660 670
mV
mV
V
FB(UV)
PGOOD/V
FB
Undervoltage Threshold V
FB
Falling
V
FB
Rising
530 540
555
550 mV
mV
V
PGOOD(ON)
PGOOD Pull-Down Resistance 15 60 Ω
Error Amplifi er
I
FB
FB Pin Input Current V
FB
= 600mV –100 100 nA
I
OUT
COMP Pin Output Current Sourcing
Sinking
1
5
mA
mA
A
V(OL)
Open-Loop Voltage Gain 75 dB
SR Slew Rate 45 V/μs
f
0dB
COMP Unity-Gain Bandwidth 20 MHz
Differential Amplifi er
A
V
Differential Amplifi er Voltage Gain V
VSNSN
= 0V
l
1.007 1 0.993 V/V
V
OS
Input Referred Offset V
VSNSN
= 0V –2 2 mV
SR Slew Rate 45 V/μs
f
0dB
Bandwidth 20 MHz
V
OUT(MAX)
Maximum Output Voltage 4V
Current Sense Amplifi er
V
ISENSE(MAX)
Maximum Differential Current Sense
Voltage (V
ISNSP
-V
ISNSN
)
50 mV
A
V(ISENSE)
Voltage Gain 18.5 V/V
V
CM(ISENSE)
Input Common Mode Range –0.3 V
CC
+ 0.1 V
I
ISENSE
SENSE Pin Input Current V
CM
= 1.5V 100 nA
V
OS
Current Sense Input Referred Offset 0°C to 125°C
–40°C to 125°C
l
–2
–2.2
2
2.2
mV
mV
Oscillator and Phase-Locked Loop
f
OSC
Oscillator Frequency V
CLKIN
= 0V
V
FREQ
= 0V
V
FREQ
= 5V
l
l
360
540
400
600
440
660
kHz
kHz
V
CLKIN
= 5V
R
FREQ
< 24.9k
R
FREQ
= 30.1k
R
FREQ
= 54.9k
R
FREQ
= 75.0k
200
300
800
1.2
kHz
kHz
kHz
MHz
Maximum Frequency
Minimum Frequency
1.25
0.25
MHz
MHz