ltc3557-ltc3557-1 Linear Technology Corporation, ltc3557-ltc3557-1 Datasheet - Page 4

• Manufacturer Part Number: ltc3557-ltc3557-1
• Description: Usb Power Manager With Li-ion Charger And Three Step-down Regulators
• Manufacturer: Linear Technology Corporation

SWITCHING REGULATOR ELECTRICAL CHARACTERISTICS
POWER MANAGER ELECTRICAL CHARACTERISTICS
LTC3557/LTC3557-1
The
V
The
V
SYMBOL
Step-Down Switching Regulators 1, 2 and 3
V
V
f
V
V
I
Step-Down Switching Regulator 1
I
I
V
I
D1
R
R
R
SYMBOL
Wall Adapter
V
V
ΔV
I
Logic (I
V
V
I
V
I
4
OSC
PD
VIN1
LIM1
FB1
QWALL
PD
CHRG
ACPR
W
IL
IH
CHRG
IN1
OUT
IL
IH
FB1
BUS
OUT
P1
N1
SW1(PD)
W
, V
●
●
UVL0
= 5V, V
= V
IN2
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T
LIM0
IN1
, I
= V
BAT
LIM1
PARAMETER
ACPR Pin Output High Voltage
ACPR Pin Output Low Voltage
Absolute Wall Input Threshold Voltage
Differential Wall Input Threshold Voltage
Wall Operating Quiescent Current
Input Low Voltage
Input High Voltage
Static Pull-Down Current
CHRG Pin Output Low Voltage
CHRG Pin Input Current
PARAMETER
Input Supply Voltage
V
V
Oscillator Frequency
Input Low Voltage
Input High Voltage
Static Pull-Down Current
Pulse-Skip Mode Input Current (Note 11)
Burst Mode Input Current (Note 11)
Shutdown Input Current
Peak PMOS Current Limit
Feedback Voltage
FB1 Input Current (Note 11)
Maximum Duty Cycle
R
R
SW1 Pull-Down in Shutdown
OUT
OUT
DS(ON)
DS(ON)
IN2
= 3.8V, ILIM0 = ILIM1 = 5V, WALL = EN1 = EN2 = EN3 = 0V, R
and CHRG)
Falling
Rising
= 3.8V, MODE = EN1 = EN2 = EN3 = 0V.
of PMOS
of NMOS
CONDITIONS
I
I
WALL Rising
WALL Falling
WALL – BAT Falling
WALL – BAT Rising
I
WALL = V
ILIM0, ILIM1
ILIM0, ILIM1
ILIM0, ILIM1; V
I
BAT = 4.5V, CHRG = 5V
CONDITIONS
(Note 10)
V
Impedance. Switching Regulators are Disabled
Below V
MODE, EN1, EN2, EN3
MODE, EN1, EN2, EN3
MODE, EN1, EN2, EN3 (V
I
I
I
EN1 = 3.8V, MODE = 0V or 3.8V (Note 7)
EN1 = 3.8V, MODE = 0V
EN1 = MODE = 3.8V
EN1 = 3.8V
FB1 = 0V, EN1 = 3.8V
EN1 = 3.8V
EN1 = 3.8V
EN1 = 0V
ACPR
ACPR
WALL
CHRG
OUT
OUT
OUT
IN1
and V
= 0, EN1 = 3.8V, MODE = 0V
= 0, EN1 = MODE = 3.8V
= 0, EN1 = 0V, FB1 = 0V
= 1mA
= 1mA
+ I
= 10mA
OUT
VOUT
OUT
IN2
UVLO
, I
Connected to V
= 5V
BAT
PIN
= 0mA,
= 1V
PIN
PROG
= 1V)
OUT
= 2k, R
Through Low
CLPROG
= 2.1k.
●
●
●
V
OUT
MIN
3.1
1.2
0
–0.05
–0.3
1.91
0.78
0.78
MIN
900
100
2.7
2.5
1.2
V
0.15
TYP
440
4.3
3.2
25
75
OUT
1200
0
2
0
2.25
0.01
TYP
220
2.7
2.8
0.8
0.8
0.3
0.4
35
10
1
MAX
4.45
0.824
150
1500
0.3
0.4
0.4
MAX
2.59
0.82
0.05
A
A
1
5.5
2.9
0.4
50
1
= 25°C.
= 25°C.
UNITS
UNITS
35571fa
MHz
mA
mV
mV
kΩ
μA
μA
μA
μA
μA
μA
μA
μA
%
Ω
Ω
V
V
V
V
V
V
V
V
V
V
V
V
V
V