LTC3556_15 Datasheet, PDF (3/36 Pages) Linear Technology – High Effi ciency USB Power Manager with Dual Buck and Buck-Boost DC/DCs

LTC3556
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_BUS = 5V, V_IN1 = V_IN2 = V_IN3 = V_OUT3 = 3.8V, BAT = 3.8V, DV_CC = 3.3V,
R_PROG = 1k, R_CLPROG = 3.01k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
I_{OUT(POWERPATH)}
V_OUT Current Available Before Loading 1x Mode, BAT = 3.3V
BAT
5x Mode, BAT = 3.3V
10x Mode, BAT = 3.3V
Suspend Mode
135
mA
672
mA
1251
mA
0.32
mA
V_CLPROG
CLPROG Servo Voltage in Current
Limit
1x, 5x, 10x Modes
Suspend Mode
1.188
V
100
mV
V_{UVLO_VBUS}
V_BUS Undervoltage Lockout
Rising Threshold
Falling Threshold
4.30 4.35
V
3.95 4.00
V
V_{UVLO_VBUS-BAT} V_BUS to BAT Differential Undervoltage Rising Threshold
Lockout
Falling Threshold
200
mV
50
mV
V_OUT
V_OUT Voltage
f_OSC
Switching Frequency
R_{PMOS_POWERPATH} PMOS On-Resistance
R_{NMOS_POWERPATH} NMOS On-Resistance
I_{PEAK_POWERPATH} Peak Switch Current Limit
1x, 5x, 10x Modes, 0V < BAT < 4.2V,
I_OUT = 0mA, Battery Charger Off
USB Suspend Mode, I_OUT = 250μA
1x, 5x Modes
10x Mode
3.4 BAT + 4.7
V
0.3
4.5
4.6 4.7
V
l
1.8
2.25 2.7
MHz
0.18
Ω
0.30
Ω
2
A
3
A
Battery Charger
V_FLOAT
BAT Regulated Output Voltage
4.179 4.200 4.221
V
l 4.165 4.200 4.235
V
I_CHG
I_BAT
V_PROG
V_{PROG_TRKL}
Constant Current Mode Charge
Current
Battery Drain Current
PROG Pin Servo Voltage
PROG Pin Servo Voltage in Trickle
Charge
R_PROG = 5k
V_BUS > V_UVLO, Battery Charger Off, I_OUT = 0μA
V_BUS = 0V, I_OUT = 0μA (Ideal Diode Mode)
BAT < V_TRKL
980 1022 1065
mA
185
204 223
mA
2
3.5
5
μA
27
38
μA
1.000
V
0.100
V
V_C/10
h_PROG
I_TRKL
V_TRKL
ΔV_TRKL
V_RECHRG
t_TERM
t_BADBAT
h_C/10
V_CHRG
I_CHRG
C/10 Threshold Voltage at PROG
Ratio of I_BAT to PROG Pin Current
Trickle Charge Current
Trickle Charge Threshold Voltage
BAT < V_TRKL
BAT Rising
Trickle Charge Hysteresis Voltage
Recharge Battery Threshold Voltage Threshold Voltage Relative to V_FLOAT
Safety Timer Termination
Timer Starts When BAT = V_FLOAT
Bad Battery Termination Time
BAT < V_TRKL
End of Charge Indication Current Ratio (Note 5)
CHRG Pin Output Low Voltage
CHRG Pin Leakage Current
I_CHRG = 5mA
V_CHRG = 5V
2.7
–75
3.3
0.42
0.088
100
mV
1022
mA/mA
100
mA
2.85 3.0
V
135
mV
–100 –125
mV
4
5
Hour
0.5 0.63
Hour
0.1 0.112 mA/mA
65 100
mV
1
μA
R_{ON_CHG}
T_LIM
Battery Charger Power FET
On-Resistance (Between V_OUT and BAT)
Junction Temperature in Constant
Temperature Mode
0.18
Ω
110
°C
3556f
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