Datasheet

LTC3557/LTC3557-1
3
35571fc
POWER MANAGER ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T
A
= 25°C.
V
BUS
= 5V, V
BAT
= 3.8V, ILIM0 = ILIM1 = 5V, WALL = EN1 = EN2 = EN3 = 0V, R
PROG
= 2k, R
CLPROG
= 2.1k.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DUVLO
V
BUS
to V
OUT
Differential Undervoltage
Lockout
Rising Threshold
Falling Threshold
50
−50
100 mV
mV
R
ON_LIM
Input Current Limit Power FET
On-Resistance (Between V
BUS
and V
OUT
)
0.2 
Battery Charger
V
FLOAT
V
BAT
Regulated Output Voltage LTC3557
LTC3557, 0°C ≤ T
A
≤ 85°C
LTC3557-1
LTC3557-1, 0°C ≤ T
A
≤ 85°C
4.179
4.165
4.079
4.065
4.200
4.200
4.100
4.100
4.221
4.235
4.121
4.135
V
V
V
V
I
CHG
Constant Current Mode Charge Current R
PROG
= 1k, Input Current Limit = 2A
R
PROG
= 2k, Input Current Limit = 1A
R
PROG
= 5k, Input Current Limit = 400mA
●
●
●
950
465
180
1000
500
200
1050
535
220
mA
mA
mA
I
BAT
Battery Drain Current V
BUS
> V
UVLO
, Charger Off, I
OUT
= 0µA
V
BUS
= 0V, I
OUT
= 0µA (Ideal Diode Mode)
6
55
27
100
µA
µA
V
PROG
V
PROG(TRKL)
PROG Pin Servo Voltage
PROG Pin Servo Voltage in Trickle Charge BAT < V
TRKL
1.000
0.100
V
V
h
PROG
Ratio of I
BAT
to PROG Pin Current 1000 mA/mA
I
TRKL
Trickle Charge Current BAT < V
TRKL
40 50 60 mA
V
TRKL
Trickle Charge Rising Threshold
Trickle Charge Falling Threshold
BAT Rising
BAT Falling 2.5
2.85
2.75
3.0 V
V
ΔV
RECHRG
Recharge Battery Threshold Voltage Threshold Voltage Relative to V
FLOAT
−75 −100 −115
mV
t
TERM
Safety Timer Termination Period Timer Starts when BAT = V
FLOAT
– 50mV 3.2 4 4.8 Hour
t
BADBAT
Bad Battery Termination Time BAT < V
TRKL
0.4 0.5 0.6 Hour
h
C/10
End-of-Charge Indication Current Ratio (Note 6) 0.085 0.1 0.115 mA/mA
R
ON(CHG)
Battery Charger Power FET On-Resistance
(Between V
OUT
and BAT)
200 m
T
LIM
Junction Temperature in Constant
Temperature Mode
110 °C
NTC
V
COLD
Cold Temperature Fault Threshold Voltage Rising NTC Voltage
Hysteresis
75 76
1.3
77 %V
VNTC
%V
VNTC
V
HOT
Hot Temperature Fault Threshold Voltage Falling NTC Voltage
Hysteresis
34 35
1.3
36 %V
VNTC
%V
VNTC
V
DIS
NTC Disable Threshold Voltage Falling NTC Voltage
Hysteresis
●
1.2 1.7
50
2.2 %V
VNTC
mV
I
NTC
NTC Leakage Current NTC = V
BUS
= 5V
−50
50 nA
Ideal Diode
V
FWD
Forward Voltage Detection I
OUT
= 10mA 5 15 25 mV
R
DROPOUT
Diode On-Resistance, Dropout I
OUT
= 1A 200 m
I
MAX
Diode Current Limit (Note 7) 3.6 A
Always On 3.3V Supply
V
LDO3V3
Regulated Output Voltage 0mA < I
LDO3V3
< 25mA 3.1 3.3 3.5 V
R
OL(LDO3V3)
Open-Loop Output Resistance BAT = 3.0V, V
BUS
= 0V 24 
R
CL(LDO3V3)
Closed-Loop Output Resistance 3.2 