Linear Technology LTC3558, Manual

Page: 3 / 32

LTC3558
3
3558f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Battery Charger
V
CC
Input Supply Voltage
l
4.3 5.5 V
I
VCC
Battery Charger Quiescent Current
(Note 4) Standby Mode, Charge Terminated
Suspend Mode, V
SUSP
= 5V
285
8.5
400
17
μA
μA
V
FLOAT
BAT Regulated Output Voltage
0°C ≤ T
A
≤ 85°C
4.179
4.165 4.200
4.200 4.221
4.235 V
V
I
CHG
Constant-Current Mode Charge
Current HPWR = 1
HPWR = 0
l
440
84
460
92
500
100 mA
mA
I
BAT
Battery Drain Current Standby Mode, Charger Terminated, EN1 = EN2 = 0
Shutdown, V
CC
< V
UVLO
, BAT = 4.2V, EN1 = EN2 = 0
Suspend Mode, SUSP = 5V, BAT = 4.2V, EN1 = EN2 = 0
V
CC
= 0V, EN1 = EN2 = 1, MODE = 1,
FB1 = FB2 = 0.85V, V
OUT2
= 3.6V
–3.5
–2.5
–1.5
–50
–7
–4
–3
–100
μA
μA
μA
μA
V
UVLO
Undervoltage Lockout Threshold BAT = 3.5V, V
CC
Rising 3.85 4 4.125 V
Δ
V
UVLO
Undervoltage Lockout Hysteresis BAT = 3.5V 200 mV
V
DUVLO
Differential Undervoltage Lockout
Threshold BAT = 4.05V, (V
CC
– BAT) Falling 30 50 70 mV
Δ
V
DUVLO
Differential Undervoltage Lockout
Hysteresis BAT = 4.05V 130 mV
V
PROG
PROG Pin Servo Voltage HPWR = 1
HPWR = 0
BAT < V
TRKL
1.000
0.200
0.100 V
V
V
h
PROG
Ratio of I
BAT
to PROG Pin Current 800 mA/mA
I
TRKL
Trickle Charge Current BAT < V
TRKL
36 46 56 mA
V
TRKL
Trickle Charge Threshold Voltage BAT Rising 2.8 2.9 3 V
Δ
V
TRKL
Trickle Charge Hysteresis Voltage 100 mV
Δ
V
RECHRG
Recharge Battery Threshold Voltage Threshold Voltage Relative to V
FLOAT
–75 –95 –115 mV
t
RECHRG
Recharge Comparator Filter Time BAT Falling 1.7 ms
t
TERM
Safety Timer Termination Period BAT = V
FLOAT
3.5 4 4.5 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 5) 0.085 0.1 0.11 mA/mA
t
C/10
End-of-Charge Comparator Filter Time I
BAT
Falling 2.2 ms
R
ON(CHG)
Battery Charger Power FET On-
Resistance (Between V
CC
and BAT)
I
BAT
= 190mA 500
m
Ω
T
LIM
Junction Temperature in Constant
Temperature Mode 105 °C
NTC
V
COLD
Cold Temperature Fault Threshold
Voltage Rising NTC Voltage
Hysteresis 75 76.5
1.6
78 %V
CC
%V
CC
V
HOT
Hot Temperature Fault Threshold
Voltage Falling NTC Voltage
Hysteresis 33.4 34.9
1.6
36.4 %V
CC
%V
CC
V
DIS
NTC Disable Threshold Voltage Falling NTC Voltage
Hysteresis
l
0.7 1.7
50
2.7 %V
CC
mV
I
NTC
NTC Leakage Current V
NTC
= V
CC
= 5V –1 1 μA
ELECTRICAL CHARACTERISTICS
The
l
denotes specifi cations that apply over the full operating temperature
range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 5V, BAT = PV
IN1
= PV
IN2
= 3.6V, R
PROG
= 1.74k, unless otherwise noted.