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LTC3559 Datasheet, PDF (4/24 Pages) Linear Technology – Linear USB Battery Charger with Dual Buck Regulators | |||
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LTC3559/LTC3559-1
ELECTRICAL CHARACTERISTICS The l denotes speciï¬cations that apply over the full operating temperature
range, otherwise speciï¬cations are at TA = 25°C.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VFB
Feedback Voltage
IFB
FB Input Current
FB1, FB2 = 0.82V
l 780 800 820
mV
â0.05
0.05
μA
DMAX
RPMOS
Maximum Duty Cycle
RDS(ON) of PMOS
FB1, FB2 = 0V
ISW = 150mA
100
%
0.65
Ω
RNMOS
RDS(ON) of NMOS
ISW = â150mA
0.75
Ω
RSW(PD) SW Pull-Down in Shutdown
13
kΩ
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD ⢠θJA°C/W)
Note 3: The LTC3559/LTC3559-1 are guaranteed to meet speciï¬cations
from 0°C to 85°C. Speciï¬cations over the â40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 4: VCC supply current does not include current through the PROG pin
or any current delivered to the BAT pin. Total input current is equal to this
speciï¬cation plus 1.00125 ⢠IBAT where IBAT is the charge current.
Note 5: IC/10 is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 6: FB high, regulator not switching.
TYPICAL PERFORMANCE CHARACTERISTICS
Suspend State Supply and BAT
Currents vs Temperature
10
9
IVCC
8
7
6
5
VCC = 5V
BAT = 4.2V
4 SUSP = 5V
EN1 = EN2 = 0V
3
2
IBAT
1
0
â55 â35 â15 5 25 45 65 85
TEMPERATURE (°C)
3559 G01
Battery Regulation (Float)
Voltage vs Temperature
4.250
VCC = 5V
4.225
4.200
LTC3559
4.175
4.150
4.125
4.100
LTC3559-1
4.075
4.050
â55 â35
â15 5 25 45
TEMPERATURE (°C)
65 85
3559 G02
Battery Regulation (Float) Voltage
vs Battery Charge Current,
Constant-Voltage Charging
4.205
4.200
4.195
4.190
4.185
4.180
4.175
4.170
4.165 VCC = 5V
4.160 HPWR = 5V
4.155
RPROG = 845Ω
EN1 = EN2 = 0V
4.150
0 100 200 300 400 500 600 700 800 900 1000
IBAT (mA)
3559 G03
3559fb
4
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