Datasheet
LTC3861-1
3
38611fa
For more information www.linear.com/LTC3861-1
elecTrical characTerisTics
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C (Note 3). V
CC
= 5V, V
RUN1,2
= 5V, V
FREQ
= 5V, V
CLKIN
= 0V,
V
FB
= 0.6V, f
OSC
= 0.6MHz, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
V
IN
Range V
CC
= 5V
l
3 24 V
V
CC
V
CC
Voltage Range
l
3 5.5 V
I
Q
Input Voltage Supply Current
Normal Operation
Shutdown Mode
UVLO
V
RUN1,2
= 5V
V
RUN1,2
= 0V
V
CC
< V
UVLO
18
6
50
mA
µA
mA
V
RUN
RUN Input Threshold V
RUN
Rising
V
RUN
Hysteresis
1.95 2.25
250
2.45 V
mV
I
RUN
RUN Input Pull-Up Current V
RUN1,2
= 2.4V 1.5 µA
V
UVLO
Undervoltage Lockout Threshold V
CC
Rising
V
CC
Hysteresis
l
100
3.0 V
mV
I
SS
Soft-Start Pin Output Current V
SS
= 0V 2.5 µA
t
SS(INTERNAL)
Internal Soft-Start Time 1.5 ms
V
FB
Regulated Feedback Voltage –40°C to 85°C
–40°C to 125°C
l
595.5
594
600
600
604.5
606
mV
mV
∆V
FB
/∆V
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 19 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
I
PGOOD(OFF)
PGOOD Leakage Current V
PGOOD
= 5V 2 µA
t
PGOOD
PGOOD Delay V
PGOOD
High to Low 30 µs
Error Amplifier
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 (Note 4) 45 V/µs
f
0dB
COMP Unity-Gain Bandwidth (Note 4) 40 MHz
Differential Amplifier
A
V
Differential Amplifier Voltage Gain V
VSNSN
= 0V
l
1.007 1 0.993 V/V
V
OS
Input Referred Offset V
VSNSN
= 0V –2 2 mV
f
0dB
DA Unity-Gain Crossover Frequency (Note 4) 40 MHz
I
OUT(SINK)
Maximum Sinking Current DIFFOUT = 1.2V 100 µA
I
OUT(SOURCE)
Maximum Sourcing Current DIFFOUT = 1.2V 500 µA
V
SNSOUT(MAX)
Maximum Output Voltage 4 V
Current Sense Amplifier
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
– 0.5 V