LTC3895
elecTrical characTerisTics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, VEXTVCC = 0V, VDRVSET = 0V,
VPRG = FLOAT unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
4
TYP
MAX
140
60
UNITS
l
V
V
V
Input Supply Operating Voltage Range (Note 10) DRVUV = 0V
Regulated Output Voltage Set Point
V
V
IN
0.8
OUT
FB
Regulated Feedback Voltage
Feedback Current
(Note 4); ITH Voltage = 1.2V
0°C to 85°C, VPRG = FLOAT
VPRG = FLOAT
VPRG = 0V
VPRG = INTV
0.792
0.788
3.220
4.875
0.800
0.800
3.300
5.000
0.808
0.812
3.380
5.125
V
V
V
V
l
l
l
CC
I
FB
(Note 4)
VPRG = FLOAT
–0.006
4
0.050
6
µA
µA
VPRG = 0V or INTV
CC
Reference Voltage Line Regulation
Output Voltage Load Regulation
(Note 4) V = 4.5V to 150V
0.002
0.02
%/V
IN
(Note 4) Measured in Servo Loop,
∆ITH Voltage = 1.2V to 0.7V
l
l
0.01
0.1
%
(Note 4) Measured in Servo Loop,
∆ITH Voltage = 1.2V to 1.6V
–0.01
2.2
–0.1
%
g
m
Transconductance Amplifier gm
Input DC Supply Current
(Note 4) ITH = 1.2V, Sink/Source 5µA
mmho
I
(Note 5) V
= 0V
DRVSET
Q
Pulse Skip or Forced Continuous Mode V = 0.83V (No Load)
2.5
40
10
mA
µA
µA
FB
Sleep Mode
V
= 0.83V (No Load)
55
20
FB
Shutdown
RUN = 0V
UVLO
Undervoltage Lockout
DRV Ramping Up
CC
l
l
DRVUV = 0V
4.0
7.5
4.2
7.8
V
V
DRVUV = INTV , DRVSET = INTV
CC
CC
DRV Ramping Down
CC
l
l
DRVUV = 0V
3.6
6.4
3.8
6.7
4.0
7.0
V
V
DRVUV = INTV , DRVSET = INTV
CC
CC
l
V
V
ON
RUN Pin ON Threshold
V
V
Rising
1.1
1.2
80
1.3
V
mV
V
RUN
RUN
Hyst RUN Pin Hysteresis
Overvoltage Lockout Threshold
RUN
l
OVLO
Rising
1.1
1.2
100
1
1.3
OVLO
OVLO Hyst OVLO Hysteresis
OVLO Delay
mV
µs
Feedback Overvoltage Protection
Measured at V , Relative to Regulated V
7
10
13
1
%
FB
FB
+
I
I
+
–
SENSE Pin Current
µA
SENSE
–
–
–
SENSE Pin Current
SENSE < V
– 0.5V
+ 0.5V
1
µA
µA
SENSE
INTVCC
INTVCC
SENSE > V
850
99
Maximum Duty Factor
In Dropout
CPUMP_EN = 0V, FREQ = 0V
98
100
%
CPUMP_EN = INTV
CC
I
Soft-Start Charge Current
V
V
= 0V
8
10
12
µA
SS
SS
V
Maximum Current Sense Threshold
= 0.7V, V
– = 3.3V
SENSE(MAX)
FB
SENSE
l
l
l
ILIM = FLOAT
ILIM = 0V
66
43
90
75
50
100
84
57
109
mV
mV
mV
ILIM = INTV
CC
3895fa
3
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