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LTC3558_15 Datasheet, PDF (4/32 Pages) Linear Technology – Linear USB Battery Charger with Buck and Buck-Boost Regulators
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LTC3558
ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VCC = 5V, BAT = PVIN1 = PVIN2 = 3.6V, RPROG = 1.74k, unless otherwise noted.
SYMBOL PARAMETER
Logic (HPWR, SUSP, CHRG, EN1, EN2, MODE)
CONDITIONS
MIN TYP MAX UNITS
VIL
VIH
RDN
VCHRG
ICHRG
Input Low Voltage
Input High Voltage
Logic Pin Pull-Down Resistance
CHRG Pin Output Low Voltage
CHRG Pin Input Current
HPWR, SUSP, MODE, EN1, EN2 Pins
HPWR, SUSP, MODE, EN1, EN2 Pins
HPWR, SUSP Pins
ICHRG = 5mA
BAT = 4.5V, VCHRG = 5V
0.4
V
1.2
V
l 1.9
4
6.3
MΩ
100 250
mV
0
1
μA
Buck Switching Regulator
PVIN1
Input Supply Voltage
IPVIN1
Pulse Skip Input Current
Burst Mode Current
Shutdown Current
Supply Current in UVLO
PVIN1 UVLO
fOSC
PVIN1 Falling
PVIN1 Rising
Switching Frequency
ILIMSW1
Peak PMOS Current Limit
VFB1
Feedback Voltage
IFB1
FB Input Current
DMAX1
Maximum Duty Cycle
RPMOS1
RDS(ON) of PMOS
RNMOS1
RDS(ON) of NMOS
RSW1(PD)
SW Pull-Down in Shutdown
Buck-Boost Switching Regulator
FB1 = 0.85V, MODE = 0 (Note 6)
FB1 = 0.85V, MODE = 1 (Note 6)
EN1 = 0
PVIN1 = PVIN2 = 2V
MODE = 0
MODE = 0
FB1 = 0.85V
FB1 = 0V
ISW1 = 100mA
ISW1 = –100mA
l 2.7
4.2
V
220 400
μA
35
50
μA
l
0
2
μA
4
8
μA
l 2.30 2.45
V
l
2.55 2.70
V
1.91 2.25 2.59
MHz
550 800 1050
mA
l 780 800 820
mV
–50
50
nA
l 100
%
0.65
Ω
0.75
Ω
13
kΩ
PVIN2
IPVIN2
PVIN2 UVLO
VOUT2(LOW)
VOUT2(HIGH)
ILIMF2
IPEAK2(BURST)
ILIMR2
IZERO2(BURST)
IMAX2(BURST)
VFB2
IFB2
fOSC
Input Supply Voltage
PWM Input Current
Burst Mode Input Current
Shutdown Current
Supply Current in UVLO
PVIN2 Falling
PVIN2 Rising
Minimum Regulated Buck-Boost VOUT
Maximum Regulated Buck-Boost VOUT
Forward Current Limit (Switch A)
Forward Current Limit (Switch A)
Reverse Current Limit (Switch D)
Reverse Current Limit (Switch D)
Maximum Deliverable Output Current
in Burst Mode Operation
Feedback Servo Voltage
FB2 Input Current
Switching Frequency
MODE = 0, IOUT = 0A, FB2 = 0.85V (Note 6)
MODE = 1, IOUT = 0A, FB2 = 0.85V (Note 6)
EN2 = 0, IOUT = 0A
PVIN1 = PVIN2 = 2V
MODE = 0
MODE = 1
MODE = 0
MODE = 1
2.7V < PVIN2 < 4.2V
2.75V < VOUT2 < 5.5V
FB2 = 0.85V
MODE = 0
l 2.7
4.2
V
220 400
μA
20
30
μA
0
1
μA
4
8
μA
l 2.30 2.45
V
l
2.55 2.70
V
2.65 2.75
V
5.45 5.60
V
l 580 700 820
mA
l 180 250 320
mA
l 325 450 575
mA
l –35
0
35
mA
50
mA
l 780 800 820
mV
–50
50
nA
1.91 2.25 2.59
MHz
3558f
4
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