Datasheet

LTC4089-3
3
40893f
For more information www.linear.com/4089-3
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. HVIN = 12V, BOOST = 17V, V
IN
= 5V, V
BAT
= 3.7V, HVEN = 12V,
HPWR = 5V, R
PROG
= 100k, R
CLPROG
= 2k, SUSP = 0V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
LIM
Current Limit R
CLPROG
= 2k, HPWR = 5V
R
CLPROG
= 2k, HPWR = 0V
l
l
475
90
500
100
525
110
mA
mA
I
IN(MAX)
Maximum Input Current Limit (Note 8) 2.4 A
R
ON
ON Resistance V
IN
to V
OUT
I
OUT
= 80mA Load 0.215
V
CLPROG
CLPROG Pin Voltage R
CLPROG
= 2k
R
CLPROG
= 1k
l
l
0.98
0.98
1.00
1.00
1.02
1.02
V
V
I
SS
Soft-Start Inrush Current IN 5 mA/µs
V
CLEN
Input Current Limit Enable
Threshold Voltage (V
IN
– V
OUT
)
(V
IN
– V
OUT
) V
IN
Rising
(V
IN
– V
OUT
) V
IN
Falling
20
–80
50
–50
80
–20
mV
mV
V
UVLO
Input Undervoltage Lockout V
IN
Powers Part, Rising Threshold
l
3.6 3.8 4 V
dV
UVLO
Input Undervoltage Lockout
Hysteresis
V
IN
Rising – V
IN
Falling 130 mV
High Voltage Regulator
V
HVIN
HVIN Supply Voltage 6 36 V
I
HVIN
HVIN Bias Current Not Switching
Shutdown; HVEN = 0V
1.9
0.01
2.5
2
mA
µA
V
OUT
Output Voltage with HVIN Present Assumes HVOUT to OUT Connection 3.45 V
BAT
+0.3 4.6 V
V
HVUVLO
High Voltage Input Undervoltage
Lockout
V
HVIN
Rising 4.7 5 V
f
SW
Switching Frequency V
HVOUT
> 3.95V
V
HVOUT
= 0V
685 750
35
815 kHz
kHz
DC
MAX
Maximum Duty Cycle
l
88 95 %
I
SW(MAX)
Switch Current Limit (Note 9) 1.5 1.95 2.3 A
V
SAT
Switch V
CESAT
I
SW
= 1A 330 mV
I
LK
Switch Leakage Current 2 µA
V
SWD
Minimum Boost Voltage Above SW I
SW
= 1A 1.85 2.2 V
I
BST
BOOST Pin Current I
SW
= 1A 30 50 mA
Battery Management
V
BAT
Input Voltage BAT 4.3 V
I
BAT
Battery Drain Current V
BAT
= 4.05V, Charging Stopped
Suspend Mode; SUSP = 5V
V
HVIN
= V
IN
= 0V, BAT Powers OUT, No Load
l
l
l
15
22
60
27
35
100
µA
µA
µA
V
FLOAT
Regulated Output Voltage I
BAT
= 2mA
I
BAT
= 2mA; (0°C – 85°C)
3.915
3.910
3.95
3.95
3.985
3.990
V
V
I
CHG
Current Mode Charge Current R
PROG
= 100k, No Load
R
PROG
= 50k, No Load; (0°C – 85°C)
l
465
900
500
1000
535
1080
mA
mA
I
CHG(MAX)
Maximum Charge Current (Note 8) 1.2 A
V
PROG
PROG Pin Voltage R
PROG
= 100k
R
PROG
= 50k
l
l
0.98
0.98
1.00
1.00
1.02
1.02
V
V
k
EOC
Ratio of End-of-Charge Current to
Charge Current
V
BAT
= V
FLOAT
(3.95V)
l
0.085 0.1 0.11 mA/mA
I
TRIKL
Trickle Charge Current V
BAT
= 2V, R
PROG
= 100k 35 50 60 mA
V
TRIKL
Trickle Charge Threshold Voltage
l
2.75 2.9 3 V
V
CEN
Charger Enable Threshold Voltage (V
OUT
– V
BAT
) Falling; V
BAT
= 4V
(V
OUT
– V
BAT
) Rising; V
BAT
= 4V
55
80
mV
mV
V
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
l
60 95 130 mV
t
TIMER
TIMER Accuracy V
BAT
= 4.05V –10 10 %
Recharge Time Percent of Total Charge Time 50 %