LTC3545 LINER [Linear Technology], LTC3545 Datasheet - Page 3

• Manufacturer Part Number: LTC3545
• Description: Triple 800mA Synchronous Step-Down Regulator-2.25MHz
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
SYMBOL
V
I
I
f
f
V
V
I
I
I
T
R
MODE/SYNC Thresholds
Individual Regulator Characteristics (One Regulator Enabled)
t
I
I
R
R
V
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 LTC3545E/LTC3545E-1 are guaranteed to meet performance
specifi cations from 0°C to 85°C. Specifi cations over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3545I/LTC3545I-1 are guaranteed to meet performance specifi cations
over the full –40°C to 125°C operating junction temperature range.
Note 3: T
dissipation P
This IC includes overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperature
temperature range, otherwise specifi cations are at T
FBx
S
OSC
SYNC
RUNx
LSWx
SYNC
SS
PK
Q
PGOODx
LOADREG
RUN(HIGH)
RUN(LOW)
UVLO
PGOODx
PFET
NFET
T
J
= T
J
A
is calculated from the ambient temperature T
+ (P
D
PARAMETER
Output Voltage Load Regulation (Notes 5, 6)
Feedback Pin Leakage (Note 5)
Input DC Bias Current (All Regulators Enabled)
Pulse Skip (Active Mode)
Burst Mode Operation (All Regulators Sleeping)
Shutdown (RUN
Oscillator Frequency
Synchronization Frequency
RUNx Input High Voltage
RUNx Input Low Voltage
RUN Leakage Current
SWx Leakage
SYNC Leakage
Power Good Threshold–Deviation From V
Steady State (0.6V)
Power Good Pull-Down On-Resistance
Soft-Start Period
Peak Switch Current Limit
Input DC Bias Current
Pulse Skip (Active Mode)
Burst Mode Operation (Sleeping)
R
R
Undervoltage Lockout
according to the following formula:
D
DS(ON)
DS(ON)
)(68°C/W)
of P-Channel FET (Note 7)
of N-Channel FET (Note 7)
X
= 0V)
A
FB
and power
A
= 25°C. V
CONDITIONS
I
V
V
LTC3545 Only
V
V
V
V
V
I
V
I
V
V
I
I
(High V
LOAD
PGD
LOAD
SWx
SWx
FBx
FBx
RUNx
RUN
IN
FBx
FBx
FBx
FBx
FBx
The
= 5.5V
= 0.5V
= 0.7V
Ramping Up
Ramping Down
= 50mA
= 10% to 90% Fullscale
= 0.5V
= 0.7V
= 100mA
= –100mA
= 0V, V
= 0A, 2.25MHz
= 0A, 2.25MHz
= 0V, V
●
CC
IN
denotes the specifi cations which apply over the full operating
to Low)
= PV
SYNC
SWx
will exceed 125°C when overtemperature is active. Continuous operation
above the specifi ed maximum operating junction temperature may impair
device reliability.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
Note 5: The LTC3545/LTC3545-1 are tested in a proprietary test mode that
connects V
Note 6: Load regulation is inferred by measuring the regulation loop gain.
Note 7: The QFN switch-on resistance is guaranteed by correlation to
water level measurements.
Note 8: Guaranteed by long-term current density limitations.
IN
= 0V or 5.5V, V
= 0V or 5.5V,
= 3.6V unless otherwise noted. (Note 3)
FB
to the output of the error amplifi er.
IN
= 5.5V
LTC3545/LTC3545-1
●
●
●
●
●
●
MIN
1.8
1
1
1
2.25
±0.1
±0.1
±0.1
–7.5
0.93
0.35
0.35
TYP
680
–10
850
310
0.5
0.1
1.3
1.8
58
14
31
1100
MAX
2.25
750
2.0
2.7
0.3
1.6
80
70
±1
±1
±1
50
3
UNITS
35451fb
3
MHz
MHz
nA
μA
μA
μA
μA
μA
μA
μA
μA
μs
%
%
%
Ω
Ω
Ω
V
V
V
A
V