LTC3557_15 Datasheet, PDF (3/28 Pages) Linear Technology – USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

LTC3557/LTC3557-1
POWER MANAGER ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications 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
100
mV
−50
mV
R_{ON_LIM}
Input Current Limit Power FET
On-Resistance (Between V_BUS and V_OUT)
Battery Charger
0.2
Ω
V_FLOAT
V_BAT Regulated Output Voltage
I_CHG
Constant Current Mode Charge Current
I_BAT
Battery Drain Current
V_PROG
V_PROG(TRKL)
h_PROG
I_TRKL
V_TRKL
PROG Pin Servo Voltage
PROG Pin Servo Voltage in Trickle Charge
Ratio of I_BAT to PROG Pin Current
Trickle Charge Current
Trickle Charge Rising Threshold
Trickle Charge Falling Threshold
LTC3557
LTC3557, 0°C ≤ T_A ≤ 85°C
LTC3557-1
LTC3557-1, 0°C ≤ T_A ≤ 85°C
R_PROG = 1k, Input Current Limit = 2A
●
R_PROG = 2k, Input Current Limit = 1A
●
R_PROG = 5k, Input Current Limit = 400mA ●
V_BUS > V_UVLO, Charger Off, I_OUT = 0μA
V_BUS = 0V, I_OUT = 0μA (Ideal Diode Mode)
BAT < V_TRKL
BAT < V_TRKL
BAT Rising
BAT Falling
4.179
4.165
4.079
4.065
950
465
180
40
2.5
4.200
4.200
4.100
4.100
1000
500
200
6
55
1.000
0.100
1000
50
2.85
2.75
4.221
4.235
4.121
4.135
1050
535
220
27
100
60
3.0
V
V
V
V
mA
mA
mA
μA
μA
V
V
mA/mA
mA
V
V
ΔV_RECHRG
t_TERM
t_BADBAT
Recharge Battery Threshold Voltage
Safety Timer Termination Period
Bad Battery Termination Time
Threshold Voltage Relative to V_FLOAT
Timer Starts when BAT = V_FLOAT – 50mV
BAT < V_TRKL
−75
−100
−115
mV
3.2
4
4.8
Hour
0.4
0.5
0.6
Hour
h_C/10
R_ON(CHG)
T_LIM
End-of-Charge Indication Current Ratio
Battery Charger Power FET On-Resistance
(Between V_OUT and BAT)
Junction Temperature in Constant
Temperature Mode
(Note 6)
0.085
0.1
0.115 mA/mA
200
mΩ
110
°C
NTC
V_COLD
V_HOT
V_DIS
Cold Temperature Fault Threshold Voltage
Hot Temperature Fault Threshold Voltage
NTC Disable Threshold Voltage
Rising NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
75
76
77
%V_VNTC
1.3
%V_VNTC
34
35
36
%V_VNTC
1.3
%V_VNTC
● 1.2
1.7
2.2 %V_VNTC
50
mV
I_NTC
NTC Leakage Current
NTC = V_BUS = 5V
−50
50
nA
Ideal Diode
V_FWD
Forward Voltage Detection
R_DROPOUT Diode On-Resistance, Dropout
I_MAX
Diode Current Limit
Always On 3.3V Supply
V_LDO3V3
R_OL(LDO3V3)
R_CL(LDO3V3)
Regulated Output Voltage
Open-Loop Output Resistance
Closed-Loop Output Resistance
I_OUT = 10mA
I_OUT = 1A
(Note 7)
0mA < I_LDO3V3 < 25mA
BAT = 3.0V, V_BUS = 0V
5
15
25
mV
200
mΩ
3.6
A
3.1
3.3
3.5
V
24
Ω
3.2
Ω
35571fc
3