Datasheet

LTC4090/LTC4090-5
3
4090fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. HVIN = HVEN = 12V, BOOST = 17V, V
IN
= HPWR = 5V, V
BAT
= 3.7V,
R
PROG
= 100k, R
CLPROG
= 2k and SUSP = 0V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CLEN
Input Current Limit Enable Threshold
Voltage (V
IN
- V
OUT
)
(V
IN
- V
OUT
) Rising
(V
IN
- V
OUT
) Falling
20
–80
50
–50
80
–20
mV
mV
V
UVLO
Input Undervoltage Lockout V
IN
Rising
l
3.6 3.8 4 V
ΔV
UVLO
Input Undervoltage Lockout Hysteresis V
IN
Rising – V
IN
Falling 130 mV
High Voltage Regulator
V
HVIN
HVIN Supply Voltage
l
660V
V
OVLO
HVIN Overvoltage Lockout Threshold
l
36 38 40 V
I
HVIN
HVIN Bias Current Shutdown; HVEN = 0.2V
Not Switching, HVOUT = 3.6V
l
0.01
130
0.5
200
μA
μA
V
OUT
Output Voltage with HVIN Present Assumes HVOUT to OUT Connection,
0 ≤ V
BAT
≤ 4.2V (LTC4090)
3.45 V
BAT
+ 0.3 4.6 V
V
OUT
Output Voltage with HVIN Present Assumes HVOUT to OUT Connection
(LTC4090-5)
4.85 5 5.15 V
f
SW
Switching Frequency R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
2.1
0.9
160
2.4
1.0
200
2.7
1.15
240
MHz
MHz
kHz
t
OFF
Minimum Switch Off-Time
l
60 150 ns
I
SW(MAX)
Switch Current Limit Duty Cycle = 5% 3.0 3.5 4.0 A
V
SAT
Switch V
CESAT
I
SW
= 2A 500 mV
I
R
Boost Schottky Reverse Leakage SW = 10V, HVOUT = 0V 0.02 2 μA
V
B(MIN)
Minimum Boost Voltage (Note 8)
l
1.5 2.1 V
I
BST
BOOST Pin Current I
SW
= 1A 22 35 mA
Battery Management
I
BAT
Battery Drain Current V
BAT
= 4.3V, Charging Stopped
Suspend Mode, SUSP = 5V
V
IN
= 0V, BAT Powers OUT, No Load
l
l
l
15
22
60
27
35
100
μA
μA
μA
V
FLOAT
V
BAT
Regulated Output Voltage I
BAT
= 2mA
I
BAT
= 2mA; 0 ≤ T
A
≤ 85°C
4.165
4.158
4.200
4.200
4.235
4.242
V
V
I
CHG
Constant-Current Mode Charge Current,
No Load
R
PROG
= 100k
R
PROG
= 50k, 0 ≤ T
A
≤ 85°C
l
465
900
500
1000
535
1080
mA
mA
I
CHG(MAX)
Maximum Charge Current 1.5 A
V
PROG
PROG Pin Servo 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 Indication
Current to Charge Current
V
BAT
= V
FLOAT
(4.2V)
l
0.085 0.1 0.11 mA/mA
I
TRKL
Trickle Charge Current BAT = 2V 35 50 60 mA
V
TRKL
Trickle Charge Threshold Voltage BAT Rising
l
2.75 2.9 3.0 V
V
CEN
Charge Enable Threshold Voltage (V
OUT
– V
BAT
) Falling; V
BAT
= 4V
(V
OUT
– V
BAT
) Rising; V
BAT
= 4V
55
80
mV
mV
ΔV
RECHRG
Recharge Battery Threshold Voltage Threshold Voltage Relative to V
FLOAT
l
–65 –100 –135 mV