Datasheet

LTC1760
3
1760fa
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply and Reference
DCIN Operating Range DCIN Selected 6 28 V
I
CH0
I
CH1
DCIN Operating Current Not Charging (DCIN Selected) (Note 10)
Charging (DCIN Selected) (Note 10)
1
1.3
1.5
2
mA
mA
I
VCC2_AC1
I
VCC2_AC0
V
CC2
Operating Current AC Present (Note 11)
AC Not Present (Note 11)
0.75
75
1
100
mA
μA
Battery Operating Voltage Range Battery Selected, PowerPath Function
Battery Selected, Charging Function (Note 2)
6
0
28
28
V
V
I
BAT
Battery Drain Current Battery Selected, Not Charging, V
DCIN
= 0V (Note 10) 175 μA
V
FDC
V
FB1
V
FB2
V
FSCN
V
PLUS
Diodes Forward Voltage:
DCIN to V
PLUS
BAT1 to V
PLUS
BAT2 to V
PLUS
SCN to V
PLUS
I
VCC
= 10mA
I
VCC
= 0mA
I
VCC
= 0mA
I
VCC
= 0mA
0.8
0.7
0.7
0.7
V
V
V
V
UVLO Undervoltage Lockout Threshold V
PLUS
Ramping Down, Measured at V
PLUS
to GND
l
35V
V
VCC
V
CC
Regulator Output Voltage
l
4.9 5.2 5.5 V
V
LDR
V
CC
Load Regulation I
VCC
= 0mA to 10mA
l
0.2 1 %
Switching Regulator
V
TOL
Voltage Accuracy With Respect to Voltage Reported by Battery
V
CHMIN
< Requested Voltage < V
LIMIT
l
–32 32 mV
I
TOL
Current Accuracy With Respect to Current Reported by Battery
4mV/R
SENSE
< Requested Current < I
LIMIT
(Min)
(Note 12)
R
ILIMIT
= 0 (Short to GND)
R
ILIMIT
= 10k ±1%
R
ILIMIT
= 33k ±1%
R
ILIMIT
= Open (or Short I
LIMIT
to V
CC2
)
l
l
l
l
–2
–4
–8
–8
2
4
8
8
mA
mA
mA
mA
f
0SC
Regulator Switching Frequency 255 300 345 kHz
f
DO
Regulator Switching Frequency in Low
Dropout Mode
Duty Cycle ≥99% 20 25 kHz
DC
MAX
Regulator Maximum Duty Cycle 99 99.5 %
I
MAX
Maximum Current Sense Threshold V
ITH
= 2.2V 140 155 190 mV
I
SNS
CA1 Input Bias Current V
CSP
= V
CSN
> 5V 150 μA
CMSL CA1 Input Common Mode Low 0 V
CMSH CA1 Input Common Mode High V
DCIN
– 0.2 V
V
CL1
CL1 Turn-On Threshold
C-Grade (Note 6)
I-Grade (Note 6)
l
l
95
94
90
100
100
100
105
108
108
mV
mV
mV
TG t
r
TG t
r
TGATE Transition Time:
TGATE Rise Time
TGATE Fall Time
C
LOAD
= 3300pF, 10% to 90%
C
LOAD
= 3300pF, 10% to 90%
50
50
90
90
ns
ns
BG t
r
BG t
f
BGATE Transition Time
BGATE Rise Time
BGATE Fall Time
C
LOAD
= 3300pF, 10% to 90%
C
LOAD
= 3300pF, 10% to 90%
50
40
90
80
ns
ns
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are at T
A
= 25°C (Note 6). V
DCIN
= 20V, V
BAT1
= 12V, V
BAT2
= 12V, V
VDDS
= 3.3V,
V
VCC2
= 5.2V unless otherwise noted.