LTC3557_15 Datasheet, PDF (4/28 Pages) Linear Technology – USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

LTC3557/LTC3557-1
POWER MANAGER ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T_A = 25°C.
V_BUS = 5V, V_BAT = 3.8V, ILIM0 = ILIM1 = 5V, WALL = EN1 = EN2 = EN3 = 0V, R_PROG = 2k, R_CLPROG = 2.1k.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Wall Adapter
V_ACPR
ACPR Pin Output High Voltage
ACPR Pin Output Low Voltage
V_W
Absolute Wall Input Threshold Voltage
I_ACPR = 1mA
I_ACPR = 1mA
WALL Rising
WALL Falling
V_OUT − 0.3 V_OUT
V
0
0.3
V
4.3
4.45
V
3.1
3.2
V
ΔV_W
Differential Wall Input Threshold Voltage WALL − BAT Falling
WALL − BAT Rising
0
25
mV
75
150
mV
I_QWALL
Wall Operating Quiescent Current
Logic (I_LIM0, I_LIM1 and CHRG)
V_IL
Input Low Voltage
V_IH
Input High Voltage
I_PD
V_CHRG
I_CHRG
Static Pull-Down Current
CHRG Pin Output Low Voltage
CHRG Pin Input Current
I_WALL + I_VOUT, I_BAT = 0mA,
WALL = V_OUT = 5V
ILIM0, ILIM1
ILIM0, ILIM1
ILIM0, ILIM1; V_PIN = 1V
I_CHRG = 10mA
BAT = 4.5V, CHRG = 5V
440
μA
0.4
V
1.2
V
2
μA
0.15
0.4
V
0
1
μA
SWITCHING REGULATOR ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T_A = 25°C.
V_OUT = V_IN1 = V_IN2 = 3.8V, MODE = EN1 = EN2 = EN3 = 0V.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Step-Down Switching Regulators 1, 2 and 3
V_IN1, V_IN2
V_OUT UVL0
Input Supply Voltage
V_OUT Falling
V_OUT Rising
f_OSC
Oscillator Frequency
V_IL
Input Low Voltage
(Note 9)
● 2.7
5.5
V
V_IN1 and V_IN2 Connected to V_OUT Through Low
Impedance. Switching Regulators are Disabled
Below V_OUT UVLO
2.5
2.7
V
2.8
2.9
V
1.91 2.25 2.59
MHz
MODE, EN1, EN2, EN3
0.4
V
V_IH
Input High Voltage
MODE, EN1, EN2, EN3
1.2
V
I_PD
Static Pull-Down Current
MODE, EN1, EN2, EN3 (V_PIN = 1V)
1
μA
Step-Down Switching Regulator 1
I_VIN1
Pulse-Skip Mode Input Current (Note 10) I_OUT = 0, EN1 = 3.8V, MODE = 0V
220
μA
Burst Mode Input Current (Note 10)
Shutdown Input Current
I_OUT = 0, EN1 = MODE = 3.8V
I_OUT = 0, EN1 = 0V, FB1 = 0V
35
50
μA
0.01
1
μA
I_LIM1
Peak PMOS Current Limit
V_FB1
Feedback Voltage
EN1 = 3.8V, MODE = 0V or 3.8V (Note 7)
EN1 = 3.8V, MODE = 0V
EN1 = MODE = 3.8V
900 1200 1500
mA
● 0.78
0.8
0.82
V
● 0.78
0.8 0.824
V
I_FB1
FB1 Input Current (Note 10)
EN1 = 3.8V
−0.05
0.05
μA
D1
Maximum Duty Cycle
FB1 = 0V, EN1 = 3.8V
100
%
R_P1
R_DS(ON) of PMOS
EN1 = 3.8V
0.3
Ω
R_N1
R_SW1(PD)
R_DS(ON) of NMOS
SW1 Pull-Down in Shutdown
EN1 = 3.8V
EN1 = 0V
0.4
Ω
10
kΩ
35571fc
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