Datasheet

LTC3553
3
3553fb
POWER MANAGER ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
BVINQ
BVIN Input Current
Buck Shutdown
Buck Enabled, Standby Mode
Buck Enabled
V
BUS
= 0V, V
BVIN
= 3.8V, I
SW
= 0 (Note 8)
BUCK_ON = 0V
BUCK_ON = STBY = 3.8V
BUCK_ON = 3.8V, STBY = 0V
0.01
1.5
22
1
3
38
µA
µA
µA
I
VINLDOQ
V
INLDO
Input Current
LDO Shutdown
LDO Enabled, Standby Mode
LDO Enabled
V
BUS
= 0V, V
INLDO
= 3.8V, I
LDO
= 0 (Note 10)
LDO_ON = 0V
LDO_ON = STBY = 3.8V
LDO_ON = 3.8V, STBY = 0V
0.01
0.1
0.1
1
1
1
µA
µA
µA
Input Power Supply
V
BUS
Input Supply Voltage 4.35 5.5 V
I
BUS(LIM)
Total Input Current HPWR = 0V (100mA)
HPWR = 5V (500mA)
l
l
80
400
90
450
100
500
mA
mA
V
UVLO
V
BUS
Undervoltage Lockout Rising Threshold
Falling Threshold 3.5
3.8
3.6
3.9 V
mV
V
DUVLO
V
BUS
to BAT Differential Undervoltage
Lockout
Rising Threshold
Falling Threshold 0
200
50
300 mV
mV
R
ON_ILIM
Input Current Limit Power FET
On-Resistance (Between V
BUS
and V
OUT
)
350 m
Battery Charger
V
FLOAT
V
BAT
Regulated Output Voltage
0 ≤ T
A
≤ 85°C
4.179
4.165
4.2
4.2
4.221
4.235
V
V
I
CHG
Constant-Current Mode Charge Current R
PROG
= 1.87k, 0 ≤ T
A
≤ 85°C 380 400 420 mA
V
PROG
V
PROG,TRKL
PROG Pin Servo Voltage
PROG Pin Servo Voltage in Trickle Charge V
BAT
< V
TRKL
1
0.1
V
V
h
PROG
Ratio of I
BAT
to PROG Pin Current 750 mA/mA
I
TRKL
Trickle Charge Current V
BAT
< V
TRKL
30 40 50 mA
V
TRKL
Trickle Charge Threshold Voltage V
BAT
Rising
V
BAT
Falling 2.6
2.9
2.75
3V
V
∆V
RECHRG
Recharge Battery Threshold Voltage Threshold Voltage Relative to V
FLOAT
–75 –100 –125 mV
t
TERM
Safety Timer Termination Period Timer Starts when V
BAT
= V
FLOAT
– 50mV 3.2 4 5 Hour
t
BADBAT
Bad Battery Termination Time V
BAT
< V
TRKL
0.4 0.5 0.63 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)
I
BAT
= 200mA 220 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
BUS
%V
BUS
V
HOT
Hot Temperature Fault Threshold Voltage Falling NTC Voltage
Hysteresis
34 35
1.3
36 %V
BUS
%V
BUS
V
DIS
NTC Disable Threshold Voltage Falling NTC Voltage
Hysteresis
l
1.2 1.7
50
2.2 %V
BUS
mV
I
NTC
NTC Leakage Current V
NTC
= V
BUS
= 5V –50 50 nA
The l denotes specifi cations that apply over the full operating temperature range, otherwise specifi cations are at T
A
= 25°C (Note 2),
V
BUS
= 5V, V
BAT
= 3.8V, HPWR = SUSP = BUCK_ON = LDO_ON = 0V, R
PROG
= 1.87k, STBY = high, unless otherwise noted.