LTC3555-X_15 Datasheet, PDF (3/32 Pages) Linear Technology – High Efficiency USB Power Manager Triple Step-Down DC/DC

LTC3555/LTC3555-X
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, BAT = 3.8V, DV_CC = 3.3V, R_PROG = 1k, R_CLPROG = 3k,
unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
h_CLPROG
(Note 4)
Ratio of Measured V_BUS Current to
CLPROG Program Current
I_{OUT(POWERPATH)} V_OUT Current Available Before
Loading BAT
V_CLPROG
V_{UVLO_VBUS}
CLPROG Servo Voltage in Current
Limit
V_BUS Undervoltage Lockout
1x Mode
5x Mode
10x Mode
Suspend Mode
1x Mode, BAT = 3.3V
5x Mode, BAT = 3.3V
10x Mode, BAT = 3.3V
Suspend Mode
1x, 5x, 10x Modes
Suspend Mode
Rising Threshold
Falling Threshold
V_{UVLO_VBUS-BAT}
V_OUT
V_BUS to BAT Differential Undervoltage
Lockout
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
Battery Charger
Rising Threshold
Falling Threshold
1x, 5x, 10x Modes, 0V < BAT < 4.2V,
I_OUT = 0mA, Battery Charger Off
USB Suspend Mode, I_VOUT = 250µA
1x, 5x Modes
10x
V_FLOAT
I_CHG
I_BAT
V_PROG
V_{PROG_TRKL}
V_C/10
h_PROG
I_TRKL
V_TRKL
ΔV_TRKL
ΔV_RECHRG
t_TERM
t_BADBAT
h_C/10
BAT Regulated Output Voltage
Constant Current Mode Charge
Current
Battery Drain Current
PROG Pin Servo Voltage
LTC3555/LTC3555-1
LTC3555/LTC3555-1
LTC3555-3
LTC3555-3
R_PROG = 1k
R_PROG = 5k
V_BUS > V_UVLO, Battery Charger Off, I_VOUT = 0µA
V_BUS = 0V, I_VOUT = 0µA (Ideal Diode Mode)
LTC3555
LTC3555-1/LTC3555-3
PROG Pin Servo Voltage in Trickle
Charge
C/10 Threshold Voltage at PROG
BAT < V_TRKL
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)
MIN TYP
224
1133
2140
11.3
135
672
1251
0.32
1.188
100
4.30
3.95 4.00
200
50
3.4 BAT + 0.3
MAX UNITS
mA/mA
mA/mA
mA/mA
mA/mA
mA
mA
mA
mA
V
mV
4.35
V
V
mV
mV
4.7
V
4.5
4.6
4.7
V
1.8
2.25
2.7
MHz
0.18
Ω
0.30
Ω
2
A
3
A
4.179
l 4.165
4.079
l 4.065
980
185
2
4.200
4.200
4.100
4.100
1022
204
3.5
27
32
1.000
0.100
100
1022
100
2.7
2.85
135
–75 –100
3.3
4
0.42
0.5
0.088 0.1
4.221
V
4.235
V
4.121
V
4.135
V
1065
mA
223
mA
5
µA
38
µA
44
µA
V
V
3.0
–125
5
0.63
0.112
mV
mA/mA
mA
V
mV
mV
Hour
Hour
mA/mA
3555fd
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