Datasheet

LTC3866
3
3866fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 15V, V
RUN
= 5V unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loops
V
IN
Input Voltage Range 4.5 38 V
V
OUT
Output Voltage Range with Diffamp in Loop 0.6 3.5 V
V
FB
Regulated Feedback Voltage Current ITH Voltage = 1.2V (Note 5)
–40°C to 85°C
–40°C to 125°C
l
l
0.597
0.5955
0.6
0.6
0.603
0.6045
V
V
I
FB
Feedback Current (Note 5) –15 –50 nA
V
REFLNREG
Reference Voltage Line
Regulation
V
IN
= 4.5V to 38V (Note 5) 0.002 0.02 %
V
LOADREG
Output Voltage Load
Regulation
(Note 5)
Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V
Measured in Servo Loop; ∆ITH Voltage = 1.2V to 1.6V
l
l
0.01
0.01
0.1
0.1
%
%
g
m
Error Amplifier (EA)
Transconductance
ITH =1.2V, Sink/Source 5µA (Note 5) 2 mmho
I
Q
Input DC Supply Current
Normal Mode
Shutdown
(Note 6)
V
IN
= 15V
V
IN
= 15V, V
RUN
= 0V
3.2
30 50
mA
µA
UVLO Undervoltage Lockout V
INTVCC
Ramping Down 3.4 3.75 4.1 V
UVLO
HYS
UVLO Hysteresis Voltage 0.5 V
V
FBOVL
Feedback Overvoltage Lockout Measured at V
FB
l
0.64 0.66 0.68 V
I
SNSD
+ SNSD
+
Pin Bias Current V
SNSD
+ = 3.3V
l
30 100 nA
I
SNSA
+ SNSA
+
Pin Bias Current V
SNSA
+ = 3.3V
l
1 2 µA
A
VT_SNS
Total Sense Signal Gain to
Current Comparator
(V
SNSD
+ + V
SNSA
+)/V
SNSD
+ 5 V/V
V
SENSE(MAX)
Maximum Current Sense
Threshold
–40°C to 85°C
V
SNS
– = 1.8V, ILIM = 0V
ILIM = 1/4 V
INTVCC
ILIM = 1/2 V
INTVCC
or Float
ILIM = 3/4 V
INTVCC
ILIM = V
INTVCC
–40°C to 125°C
V
SNS
– = 1.8V, ILIM = 0V
ILIM = 1/4V
INTVCC
ILIM = 1/2V
INTVCC
or Float
ILIM = 3/4V
INTVCC
ILIM = V
INTVCC
l
l
l
l
l
l
l
l
l
l
9.2
14.2
19.2
23.5
28.5
9
14
19
23.5
28.5
10
15
20
25
30
10
15
20
25
30
10.8
15.8
20.8
26.5
31.5
11
16
21
26.5
31.5
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
I
TEMP
DCR Temperature
Compensation Current
V
ITEMP
= 0.3V
l
9 10 11 µA
I
TK/SS
Soft-Start Charge Current V
TK/SS
= 0V
l
1.0 1.25 1.5 µA
V
RUN
RUN Pin On Threshold Voltage V
RUN
Rising
l
1.1 1.22 1.35 V
V
RUN(HYS)
RUN Pin On Hysteresis
Voltage
80 mV
TG
t
r
t
f
Top Gate (TG) Transition Time
Rise Time
Fall Time
(Note 7)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
25
25
ns
ns
BG
t
r
t
f
Bottom Gate (BG) Transition
Time
Rise Time
Fall Time
(Note 7)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
25
25
ns
ns