Datasheet
LTC3557/LTC3557-1
4
35571fc
POWER MANAGER ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations 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
I
ACPR
= 1mA
I
ACPR
= 1mA
V
OUT
− 0.3
V
OUT
0 0.3
V
V
V
W
Absolute Wall Input Threshold Voltage WALL Rising
WALL Falling 3.1
4.3
3.2
4.45 V
V
ΔV
W
Differential Wall Input Threshold Voltage
WALL − BAT Falling
WALL − BAT Rising
025
75 150
mV
mV
I
QWALL
Wall Operating Quiescent Current
I
WALL
+ I
VOUT
, I
BAT
= 0mA,
WALL = V
OUT
= 5V
440 µA
Logic (I
LIM0
, I
LIM1
and CHRG)
V
IL
Input Low Voltage ILIM0, ILIM1 0.4 V
V
IH
Input High Voltage ILIM0, ILIM1 1.2 V
I
PD
Static Pull-Down Current ILIM0, ILIM1; V
PIN
= 1V 2 µA
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 10mA 0.15 0.4 V
I
CHRG
CHRG Pin Input Current BAT = 4.5V, CHRG = 5V 0 1 µA
SWITCHING REGULATOR ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations 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
Input Supply Voltage (Note 9)
●
2.7 5.5 V
V
OUT
UVL0 V
OUT
Falling
V
OUT
Rising
V
IN1
and V
IN2
Connected to V
OUT
Through Low
Impedance. Switching Regulators are Disabled
Below V
OUT
UVLO
2.5 2.7
2.8 2.9
V
V
f
OSC
Oscillator Frequency 1.91 2.25 2.59 MHz
V
IL
Input Low Voltage 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) I
OUT
= 0, EN1 = MODE = 3.8V 35 50 µA
Shutdown Input Current I
OUT
= 0, EN1 = 0V, FB1 = 0V 0.01 1 µA
I
LIM1
Peak PMOS Current Limit EN1 = 3.8V, MODE = 0V or 3.8V (Note 7) 900 1200 1500 mA
V
FB1
Feedback Voltage EN1 = 3.8V, MODE = 0V
EN1 = MODE = 3.8V
●
●
0.78
0.78
0.8
0.8
0.82
0.824
V
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
R
N1
R
DS(ON)
of NMOS EN1 = 3.8V 0.4
R
SW1(PD)
SW1 Pull-Down in Shutdown EN1 = 0V 10 k