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LT8491
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
PARAMETER
Switching Regulator Oscillator (OSC1)
Switch Frequency Range
Switching Frequency, f
OSC
SYNC High Level for Synchronization
SYNC Low Level for Synchronization
SYNC Clock Pulse Duty Cycle
Recommended Min SYNC Ratio, f
CLKOUT Output Voltage HIGH
CLKOUT Output Voltage LOW
CLKOUT Duty Cycle
Charging Control
STATUS, FBOW, FBIW, SWENO, IOW, ECON Output
Low Voltage
STATUS, FBOW, FBIW, SWENO, IOW, ECON Output
High Voltage
Power Supply Mode Detection Threshold (Note 6)
Power Supply Mode Detection Threshold Hysteresis
(Note 6)
Minimum VINR Voltage for Startup (Note 6)
High Charging Current Threshold on IOR (Note 6)
Low Charging Current Threshold on IOR (Note 6)
Minimum TEMPSENSE % of AV
DD
Disconnected (Note 6)
V
– V
Threshold for C/5 Detection
CSPOUT
CSNOUT
(Note 6)
V
– V
Threshold for C/10 Detection
CSPOUT
CSNOUT
(Note 6)
FBIW, FBOW PWM Frequency (OSC2)
FBIW, FBOW PWM Resolution
Internal A/D Resolution
6
= 25°C. V
A
CONDITIONS
Syncing or Free Running
R
= 365kΩ
T
R
= 215kΩ
T
R
= 124kΩ
T
V
= 0V to 2V
SYNC
/f
SYNC
OSC
1mA Out of CLKOUT Pin
1mA into CKLKOUT Pin
T
= –40°C
J
T
= 25°C
J
T
= 125°C
J
I
= 5mA
OL
I
= –5mA
OH
VINR Pin Falling
Not in Power Supply Mode
Low Power Mode Enabled
Low Power Mode Disabled
IOR Rising → ECON Rising
IOR Falling → ECON Falling
to Detect Battery
V
Common Mode = 5.0V, R
CSxOUT
IMON_OUT to Ground = 24.3kΩ
V
Common Mode = 5.0V, IOR Falling, R
CSxOUT
from IMON_OUT to Ground = 24.3kΩ
For more information
The
denotes the specifications which apply over the full operating
l
= 12V, V
= AV
= 3.3V, SHDN = 3V unless otherwise noted. (Note 3)
IN
DD
DD
from
TOTAL
www.analog.com
MIN
TYP
100
102
120
l
170
202
l
310
350
l
1.3
l
l
20
¾
2.3
2.45
25
22.7
44.1
77
0.22
l
2.7
3
l
155
174
l
29
380
395
l
213
225
l
168
195
l
95
122
l
94.5
96
l
9
10
4.25
5
TOTAL
31.25
8
10
MAX
UNITS
400
kHz
142
kHz
235
kHz
400
kHz
V
0.5
V
80
%
f/f
2.55
V
100
mV
%
%
%
0.5
V
V
mV
mV
410
mV
237
mV
224
mV
150
mV
97.5
%
11
mV
5.75
mV
kHz
bits
bits
Rev. 0
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