LTC3407A-2 Datasheet, PDF (3/16 Pages) Linear Technology – Dual Synchronous 800mA,2.25MHz Step-Down DC/DC Regulator

LTC3407A-2
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
V_IN
I_FB
V_FB
ΔV_{LINE REG}
ΔV_{LOAD REG}
I_S
f_OSC
f_SYNC
I_LIM
R_DS(ON)
I_SW(LKG)
POR
Operating Voltage Range
Feedback Pin Input Current
Feedback Voltage (Note 3)
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
Synchronization Frequency
Peak Switch Current Limit
Top Switch On-Resistance
Bottom Switch On-Resistance
Switch Leakage Current
Power-On Reset Threshold
Power-On Reset On-Resistance
Power-On Reset Delay
0°C ≤ T_A ≤ 85°C
–40°C ≤ T_A ≤ 125°C (Note 2)
V_IN = 2.5V to 5.5V (Note 3)
MODE/SYNC = 0V (Note 3)
(Note 4)
V_FB1 = V_FB2 = 0.5V
V_FB1 = V_FB2 = 0.63V, MODE/SYNC = 3.6V
RUN = 0V, V_IN = 5.5V, MODE/SYNC = 0V
V_FBX = 0.6V
V_IN = 3V, V_FBX = 0.5V, Duty Cycle <35%
(Note 6)
(Note 6)
V_IN = 5V, V_RUN = 0V, V_FBX = 0V
V_FBX Ramping Up, MODE/SYNC = 0V
V_FBX Ramping Down, MODE/SYNC = 0V
● 2.5
5.5
V
●
30
nA
0.588 0.6 0.612
V
● 0.585 0.6 0.612
V
0.3
0.5
%/V
0.5
%
● 1.8
1
700 950
40
60
0.1
1
2.25
2.7
2.25
1.2
1.6
0.35 0.45
0.30 0.45
0.01
1
8.5
–8.5
100 200
65,536
μA
μA
μA
MHz
MHz
A
Ω
Ω
μA
%
%
Ω
Cycles
V_RUN
I_RUN
V_MODE
RUN/SS Threshold Low
RUN/SS Threshold High
RUN/SS Leakage Current
MODE Threshold Low
MODE Threshold High
● 0.3
1
1.5
V
●
2
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.
Note 2: The LTC3407AE-2 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. The LTC3407AI-2 is guaranteed over the
full –40°C to 125°C operating temperature range.
Note 3: The LTC3407A-2 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.
3407a2f
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