LTC3410_15 Datasheet, PDF (3/16 Pages) Linear Technology – 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70

LTC3410
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T_A = 25°C.
V_IN = 3.6V unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
V_UVLO
Undervoltage Lockout Threshold
V_IN Rising
V_IN Falling
I_S
Input DC Bias Current
Burst Mode^® Operation
Shutdown
(Note 4)
V_FB = 0.83V or V_OUT = 104%, I_LOAD = 0A
V_RUN = 0V
f_OSC
Oscillator Frequency
V_FB = 0.8V or V_OUT = 100%
V_FB = 0V or V_OUT = 0V
R_PFET
R_DS(ON) of P-Channel FET
I_SW = 100mA
R_NFET
R_DS(ON) of N-Channel FET
I_SW = –100mA
I_LSW
SW Leakage
V_RUN = 0V, V_SW = 0V or 5V, V_IN = 5V
V_RUN
RUN Threshold
I_RUN
RUN Leakage Current
Burst Mode is a registered trademark of Linear Technology Corporation.
2
2.3
V
1.94
V
26
35
µA
0.1
1
µA
●
1.8
2.25
2.7
MHz
310
kHz
0.75
0.9
Ω
0.55 0.7
Ω
±0.01 ±1
µA
● 0.3
1
1.5
V
●
±0.01 ±1
µA
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 LTC3410E 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.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
LTC3410: T_J = T_A + (P_D)(250°C/W)
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: 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 PERFOR A CE CHARACTERISTICS
(From Figure1 Except for the Resistive Divider Resistor Values)
Efficiency vs Input Voltage
100
I_OUT = 100mA
90
80
I_OUT = 250mA
70
I_OUT = 10mA
I_OUT = 1mA
60
50
I_OUT = 0.1mA
40
30 ^{VOUT = 1.8V}
2.5 3 3.5 4 4.5
INPUT VOLTAGE (V)
5 5.5
3410 G02
Efficiency vs Output Current
100
90
80
70
60
50
40
30
20
10
0 ^{VOUT = 1.8V}
0.1
1
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
10
100
1000
OUTPUT CURRENT (mA)
3410 G03
Efficiency vs Output Current
100
90
80
70
60
50
40
30
20
10
0 ^{VOUT = 1.2V}
0.1
1
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
10
100
1000
OUTPUT CURRENT (mA)
3410 G04
3410fb
3