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ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
PARAMETER
Voltage Supply and Regulators
V
Operating Voltage Range (Note 7)
IN
V
Quiescent Current
IN
V
Quiescent Current in Shutdown
IN
V
Quiescent Current
DD
EXTV
Switchover Voltage
CC
EXTV
Switchover Hysteresis
CC
LDO33 Pin Voltage
LDO33 Pin Load Regulation
LDO33 Pin Current Limit
LDO33 Pin Undervoltage Lockout
LDO33 Pin Undervoltage Lockout Hysteresis
Switching Regulator Control
SHDN Input Voltage High
SHDN Input Voltage High Hysteresis
SHDN Input Voltage Low
SHDN Pin Bias Current
SWEN Rising Threshold Voltage
SWEN Threshold Voltage Hysteresis
MODE Pin Thresholds
IMON_OUT Rising threshold for CCM Operation
IMON_OUT Falling threshold for DCM
Voltage Regulation
Regulation Voltage for FBOUT
Regulation Voltage for FBIN
FBOUT Pin Bias Current
FBIN Pin Bias Current
Current Regulation
Regulation Voltage for IMON_IN and IMON_OUT
IMON_IN Output Current
IMON_IN Overvoltage Threshold
IMON_OUT Output Current
IMON_OUT Overvoltage Threshold
The
denotes the specifications which apply over the full operating
l
= 25°C. V
= 12V, V
= AV
A
IN
DD
CONDITIONS
Not Switching, V
= 0, V
= AV
EXTVCC
DD
V
= 0V
SHDN
I
+ I
, V
= AV
= 3.3V
AVDD
VDD
DD
DD
I
= 20mA, V
Rising
INTVCC
EXTVCC
5mA from LDO33 Pin
I
= 0.1mA to 5mA
LDO33
LDO33 Falling
SHDN Rising to Enable the Device
Device Disabled, Low Quiescent Current
V
= 3V
SHDN
V
= 12V
SHDN
Discontinuous Mode
Automatic DCM/CCM Mode
MODE = 0V
MODE = 0V
V
= 1.2V, EXTV
= 0
C
CC
V
= 1.2V, EXTV
= 0
C
CC
Current Out of Pin
Current Out of Pin
VC = 1.2V, EXTV
= 0
CC
V
– V
= 50mV, V
= 5.025V
CSPIN
CSNIN
CSPIN
V
– V
= 50mV, V
= 5.025V
CSPIN
CSNIN
CSPIN
V
– V
= 0mV, V
= 5V
CSPIN
CSNIN
CSPIN
V
– V
= 50mV, V
CSPOUT
CSNOUT
CSPOUT
V
– V
= 50mV, V
CSPOUT
CSNOUT
CSPOUT
V
– V
= 5mV, V
CSPOUT
CSNOUT
CSPOUT
V
– V
= 5mV, V
CSPOUT
CSNOUT
CSPOUT
For more information
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= 3.3V, SHDN = 3V unless otherwise noted. (Note 3)
DD
MIN
6
l
= Float
DD
2.5
l
6.15
l
3.23
l
12
l
2.96
1.184
l
l
1.156
l
l
0.4
l
168
95
1.193
l
1.184
l
1.187
l
54
53
l
2.5
l
1.55
l
= 5.025V
47.5
= 5.025V
47
l
= 5.0025V
3.25
= 5.0025V
2.75
l
1.55
l
LT8491
TYP
MAX
UNITS
80
V
2.65
4.2
mA
0
1
µA
4
6.5
mA
6.4
6.6
V
0.18
V
3.295
3.35
V
–0.25
–1
%
17.25
22
mA
3.04
3.12
V
35
mV
1.234
1.284
V
50
mV
0.35
V
0
1
µA
11
22
µA
1.206
1.256
V
22
mV
2.3
V
V
195
224
mV
122
150
mV
1.207
1.222
V
1.205
1.226
V
15
nA
10
nA
1.208
1.229
V
57
60
µA
57
61
µA
7
11.5
µA
1.61
1.67
V
50
52.5
µA
50
54.25
µA
5
6.75
µA
5
8
µA
1.61
1.67
V
Rev. 0
5
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