LTC3555 Linear Technology, LTC3555 Datasheet - Page 6

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

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LTC3555
ELECTRICAL CHARACTERISTICS
SYMBOL
R
R
R
R
General Purpose Switching Regulator 3
I
I
I
V
V
V
R
R
R
R
t
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3555E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: The LTC3555E includes overtemperature protection that is
intended to protect the device during momentary overload conditions.
Junction temperature will exceed 125°C when overtemperature protection
is active. Continuous operation above the specifi ed maximum operating
junction temperature may impair device reliability.
6
temperature range, otherwise specifi cations are at T
unless otherwise noted.
VIN3
LIM3
OUT3
⎯ R ⎯ S ⎯ T ⎯ 3
FBHIGH3
FBLOW3
LSB3
P2
N2
LDO_CL2
LDO_OL2
P3
N3
LDOCL3
LDOOL3
PARAMETER
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
PMOS R
NMOS R
LDO Mode Closed Loop R
LDO Mode Open Loop R
Power On Reset Time for Switching
Regulator
FB
Servo Voltage Step Size
DS(ON)
DS(ON)
DS(ON)
DS(ON)
OUT
OUT
OUT
OUT
A
CONDITIONS
(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)
(Note 8)
V
OUT3
OUT3
OUT3
OUT3
OUT3
FB3
= 25°C. V
Within 92% of Final Value to ⎯ R ⎯ S ⎯ T ⎯ 3 Hi-Z
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA (Note 6)
= 0μA, FB3 = 0V
The
●
BUS
denotes the specifi cations which apply over the full operating
= 5V, BAT = 3.8V, DV
Note 4: Total input current is the sum of quiescent current, I
measured current given by:
Note 5: h
with indicated PROG resistor.
Note 6: FBx above regulation such that regulator is in sleep. Specifi cation
does not include resistive divider current refl ected back to V
Note 7: Applies to Pulse Skip, Burst Mode operation and Forced Burst
Mode operation only.
Note 8: Inductor series resistance adds to open-loop R
V
CLPROG
C/10
/R
is expressed as a fraction of measured full charge current
CLPROG
CC
• (h
= 3.3V, R
CLPROG
+1)
PROG
0.405
1500
1000
0.78
MIN
150
50
= 1k, R
0.425
2000
0.25
0.80
0.18
0.30
0.25
TYP
225
230
0.6
0.7
2.5
2.5
35
20
20
25
CLPROG
OUT
= 3k,
.
0.445
2800
MAX
0.82
INx
VBUSQ
60
35
35
1
.
, and
UNITS
3555f
mA
mA
mA
mA
mV
ms
μA
μA
μA
μA
μA
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
V
V