LTC3555 Linear Technology, LTC3555 Datasheet - Page 5

• Manufacturer Part Number: LTC3555
• Description: High Efficiency USB Power Manager + Triple Step-Down DC/DC
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
SYMBOL
t
t
t
t
General Purpose Switching Regulators 1, 2 and 3
V
V
f
I
D
R
General Purpose Switching Regulator 1
I
I
I
V
R
R
R
R
General Purpose Switching Regulator 2
I
I
I
V
V
V
Burst Mode is a registered trademark of Linear Technology Corporation.
temperature range, otherwise specifi cations are at T
unless otherwise noted.
HIGH
f
r
SP
OSC
FB1,2,3
VIN1
LIM1
OUT1
VIN2
LIM2
OUT2
IN1,2,3
OUTUVLO
FB1
FBHIGH2
FBLOW2
LSB2
1,2,3
SW1,2,3_PD
P1
N1
LDO_CL1
LDO_OL1
PARAMETER
Clock High Period
Clock Data Fall Time
Clock Data Rise Time
Spike Suppression Time
Input Supply Voltage
V
V
Oscillator Frequency
FBx Input Current
Maximum Duty Cycle
SWx Pull-Down in Shutdown
Pulse Skip Mode Input Current
Burst Mode Input Current
Forced Burst Mode
LDO Mode Input Current
Shutdown Input Current
PMOS Switch Current Limit
Available Output Current
V
PMOS R
NMOS R
LDO Mode Closed-Loop R
LDO Mode Open-Loop R
Pulse Skip Mode Input Current
Burst Mode Input Current
Forced Burst Mode Input Current
LDO Mode Input Current
Shutdown Input Current
PMOS Switch Current Limit
Available Output Current
Maximum Servo Voltage
Minimum Servo Voltage
V
OUT
OUT
FB1
FB2
Servo Voltage
Servo Voltage Step Size
UVLO—V
UVLO—V
DS(ON)
DS(ON)
OUT
OUT
®
Falling
Rising
Input Current
OUT
OUT
A
CONDITIONS
V
Impedance. Switching Regulators are Disabled in
UVLO
V
I
I
I
I
I
Pulse Skip/Burst Mode Operation
Pulse Skip/Burst Mode Operation (GBNT)
Forced Burst Mode Operation (GBNT)
LDO Mode (GBNT)
(Note 7)
(Note 8)
I
I
I
I
I
Pulse Skip/Burst Mode Operation
Pulse Skip/Burst Mode Operation (GBNT)
Forced Burst Mode Operation (GBNT)
LDO Mode (GBNT)
Full Scale (1, 1, 1, 1) (Note 7)
Zero Scale (0, 0, 0, 0) (Note 7)
OUT1
OUT1
OUT1
OUT1
OUT1
OUT2
OUT2
OUT2
OUT2
OUT2
IN1,2,3
FB1,2,3
= 25°C. V
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA, FB1 = 0V
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA, FB2 = 0V
The
Connected to V
= 0.85V
●
BUS
denotes the specifi cations which apply over the full operating
= 5V, BAT = 3.8V, DV
OUT
Through Low
CC
= 3.3V, R
PROG
0.405
0.78
0.78
MIN
–50
100
600
400
600
400
0.6
2.7
2.5
1.8
20
20
50
60
50
60
50
= 1k, R
0.425
2.25
0.80
0.25
0.80
TYP
225
800
225
800
2.6
2.8
0.6
0.7
2.5
10
35
20
20
35
20
20
25
CLPROG
LTC3555
= 3k,
0.445
1100
1100
MAX
0.82
0.82
300
300
5.5
2.9
2.7
50
60
35
35
60
35
35
1
1
UNITS
5
MHz
3555f
mA
mA
mA
mA
mA
mA
mA
mA
mV
kΩ
nA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μs
ns
ns
ns
%
Ω
Ω
Ω
Ω
V
V
V
V
V
V