LTC3440 Datasheet, PDF (3/20 Pages) Linear Technology – Micropower Synchronous Buck-Boost DC/DC Converter

LTC3440
ELECTRICAL CHARACTERISTICS The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T_A = 25°C. V_IN = V_OUT = 3.6V, R_T = 60k, unless otherwise noted.
PARAMETER
Error Amp AVOL
Error Amp Source Current
Error Amp Sink Current
SHDN/SS Threshold
SHDN/SS Input Current
CONDITIONS
When IC is Enabled
When EA is at Maximum Boost Duty Cycle
V_SHDN = 5.5V
MIN TYP MAX UNITS
90
dB
15
μA
380
μA
● 0.4
1
1.5
V
2.2
V
0.01
1
μA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC3440E 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: Current measurements are performed when the outputs are not
switching.
TYPICAL PERFOR A CE CHARACTERISTICS
Li-Ion to 3.3V Efficiency
(f_OSC = 300kHz)
100
90 _{Burst Mode}
OPERATION
80
70
V_IN = 4.2V
V_IN = 2.5V
60
V_IN = 3.3V
50
40
30
f_OSC = 300kHz
20
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3440 G01
Li-Ion to 3.3V Efficiency,
Power Loss (f_OSC = 1MHz)
100
1000
90 Burst Mode
OPERATION
80
100
V_IN = 4.2V
70
V_IN = 2.5V
V_IN = 3.3V
60
10
50
V_IN = 3.3V
40
1
30
20
0.1
f_OSC = 1MHz
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
3440 G02
Switch Pins During Buck/Boost
Switch Pins on the Edge of
Buck/Boost and Approaching Boost
Li-Ion to 3.3V Efficiency
(f_OSC = 2MHz)
100
90 Burst Mode
OPERATION
80
70
60
V_IN = 2.5V
50
V_IN = 4.2V
V_IN = 3.3V
40
30
20
0.1
f_OSC = 2MHz
1
10
100
OUTPUT CURRENT (mA)
1000
3440 G03
Switch Pins on the Edge of
Buck/Boost and Approaching Buck
SW1
2V/DIV
SW1
2V/DIV
SW1
2V/DIV
SW2
2V/DIV
V_IN = 3.78V
V_OUT = 3.3V
I_OUT = 250mA
50ns/DIV
SW2
2V/DIV
3440 G04
V_IN = 3.42V
V_OUT = 3.3V
I_OUT = 250mA
50ns/DIV
SW2
2V/DIV
3440 G05
V_IN = 4.15V
V_OUT = 3.3V
I_OUT = 250mA
50ns/DIV
3440 G06
3440fb
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