LTC3560_15 Datasheet, PDF (3/16 Pages) Linear Technology – 2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT

LTC3560
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_RUN
I_RUN
V_SYNC/MODE
I_SYNC/MODE
t_SOFTSTART
RUN Threshold
RUN Leakage Current
SYNC/MODE Threshold
SYNC/MODE Leakage Current
Soft-Start Time
V_FB from 10% to 90% Full Scale
l 0.3
1
1.5
V
l
±0.01 ±1
μA
l 0.3
1.0
1.5
V
l
±0.01 ±1
μA
0.6
0.9
1.2
ms
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 LTC3560E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3560I is guaranteed to meet
specified performance specifications over the full –40°C to 125°C
operating temperature range.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
LTC3560: T_J = T_A + (P_D)(250°C/W)
Note 4: The LTC3560 is tested in a proprietary test mode that connects V_FB
to the output of the error amplifier.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: Guaranteed by long-term current density limitations.
Note 7: This IC 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 specified maximum operating junction
temperature may impair device reliability.
TYPICAL PERFORMANCE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Efficiency vs Input Voltage
100
95 ^{IOUT = 100mA}
90
I_OUT = 10mA
85 I_OUT = 1mA
80
I_OUT = 900mA
75
70
65
I_OUT = 0.1mA
60
55
V_OUT = 1.8V
50
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
3560 G01
Efficiency vs Output Current
100
90
80
70
60
50
40
30
20
V_IN = 3.6V
10
V_IN = 4.2V
V_OUT = 3.3V
0
V_IN = 5.5V
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
3560 G02
Efficiency vs Output Current
100
V_OUT = 1.8V
90
80
70
60
50
40
30
20
10
0
0.1
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
V_IN = 5.5V
1
10
100
OUTPUT CURRENT (mA)
1000
3560 G03
3560fb
3