LTC3404 Datasheet, PDF (3/16 Pages) Linear Technology – 1.4MHz High Efficiency Monolithic Synchronous Step-Down Regulator

LTC3404
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
V_IN = 3.6V unless otherwise specified.
SYMBOL PARAMETER
I_PK
I_LSW
V_SYNC/MODE
I_SYNC/MODE
V_RUN
I_RUN
Peak Inductor Current
SW Leakage
SYNC/MODE Threshold
SYNC/MODE Leakage Current
RUN Threshold
RUN Input Current
CONDITIONS
V_IN = 3.3V, V_FB = 0.7V, Duty Cycle < 35%
V_RUN = 0V, V_SW = 0V or 6V, V_IN = 6V
V_SYNC/MODE Rising
V_RUN Rising
MIN TYP MAX
0.8
1.0
1.25
±0.01 ±1
q 0.3
1.0
1.5
±0.01 ±1
q 0.3
0.7
1.5
±0.01 ±1
UNITS
A
µA
V
µA
V
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3404E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formulas:
LTC3404EMS8: T_J = T_A + (P_D)(150°C/W)
Note 4: The LTC3404 is tested in a feedback loop which servos V_FB to the
balance point for the error amplifier (V_ITH = 1.2V).
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
95
I_OUT = 100mA
90
I_OUT = 10mA
85
I_OUT = 1mA ^{IOUT = 300mA}
80
75
70
I_OUT = 0.1mA
65
Burst Mode OPERATION
V_OUT = 2.5V
L = 4.7µH
60
2
3
4
5
6
7
8
INPUT VOLTAGE (V)
3404 G01
Efficiency vs Output Current
100
90 _{VIN = 3.6V}
80
V_IN = 4.2V
70
60
50
V_IN = 3.6V
40
V_IN = 4.2V
30
20
10
0
0.1
PULSE SKIPPING MODE
Burst Mode OPERATION
V_OUT = 1.8V
L = 4.7µH
1
10
100
OUTPUT CURRENT (mA)
1000
3404 G02
Efficiency vs Output Current
90
85 ^{L = 4.7µH}
80
L = 3.5µH
75
70
65
60
Burst Mode OPERATION
55 _{VIN = 6V}
V_OUT = 2.5V
50
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3404 G03
3