LTC3407-4 Datasheet, PDF (3/16 Pages) Linear Technology – Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3407-4
ELECTRICAL CHARACTERISTICS The ● 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. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
POR
Power-On Reset Threshold
V_FBX Ramping Up, MODE/SYNC = 0V
V_FBX Ramping Down, MODE/SYNC = 0V
Power-On Reset On-Resistance
8.5
%
–8.5
%
100 200
Ω
Power-On Reset Delay
65536
Cycles
V_RUN
I_RUN
V_MODE
RUN Threshold
RUN Leakage Current
MODE Threshold Low
MODE Threshold High
● 0.3
1
1.5
V
●
0.01
1
µA
0
0.5
V
V_IN – 0.5
V_IN
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. Pins of regulators should not exceed 6V
Note 2: The LTC3407E-4 is guaranteed to meet specified performance
from 0°C to 85°C. Specifications over the – 40°C and 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: The LTC3407-4 is tested in a proprietary test mode that connects
V_FB to the output of the error amplifier.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T_J is calculated from the ambient T_A and power dissipation P_D
according to the following formula: T_J = T_A + (P_D • θ_JA).
Note 6: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Burst Mode Operation
Pulse Skipping Mode
Load Step
SW
5V/DIV
V_OUT
20mV/DIV
I_L
200mA/DIV
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 100mA
2µs/DIV
SW
5V/DIV
V_OUT
20mV/DIV
I_L
200mA/DIV
34073 G01
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 20mA
1µs/DIV
V_OUT
200mV/DIV
I_L
500mA/DIV
I_LOAD
500mA/DIV
34073 G02
V_IN = 3.6V
10µs/DIV
V_OUT = 1.8V
I_LOAD = 80mA ~ 800mA
34074 G03
34074f
3