LTC3557-1 Linear Technology, LTC3557-1 Datasheet - Page 4

• Manufacturer Part Number: LTC3557-1
• Description: USB Power Manager
• Manufacturer: Linear Technology

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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
⎯ C ⎯ H ⎯ R ⎯ G
⎯ A ⎯ C ⎯ P ⎯ R
W
IL
IH
⎯ C ⎯ H ⎯ R ⎯ G
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
⎯ A ⎯ C ⎯ P ⎯ R Pin Output High Voltage
⎯ A ⎯ C ⎯ P ⎯ R 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
⎯ C ⎯ H ⎯ R ⎯ G Pin Output Low Voltage
⎯ C ⎯ H ⎯ R ⎯ G 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 ⎯ C ⎯ H ⎯ R ⎯ G )
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, ⎯ C ⎯ H ⎯ R ⎯ G = 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
⎯ A ⎯ C ⎯ P ⎯ R
⎯ A ⎯ C ⎯ P ⎯ R
WALL
⎯ C ⎯ H ⎯ R ⎯ G
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
Through Low
= 2k, R
CLPROG
●
●
●
V
= 2.1k.
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
35571f
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