ltc3440 Linear Technology Corporation, ltc3440 Datasheet - Page 3

• Manufacturer Part Number: ltc3440
• Description: Micropower Synchronous Buck-boost Dc/dc Converter
• Manufacturer: Linear Technology Corporation

PARAMETER
Error Amp AVOL
Error Amp Source Current
Error Amp Sink Current
SHDN/SS Threshold
SHDN/SS Input Current
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
TYPICAL PERFOR A CE CHARACTERISTICS
range, otherwise specifications are at T
ELECTRICAL CHARACTERISTICS
2V/DIV
2V/DIV
SW1
SW2
100
90
80
70
60
50
40
30
20
0.1
Li-Ion to 3.3V Efficiency
(f
Switch Pins During Buck/Boost
V
V
I
OUT
f
IN
OUT
OSC
OSC
OPERATION
V
Burst Mode
IN
= 3.78V
= 250mA
= 3.3V
= 2.5V
= 300kHz
= 300kHz)
1
OUTPUT CURRENT (mA)
V
IN
50ns/DIV
= 3.3V
10
V
IN
= 4.2V
100
W
3440 G01
3440 G04
U
1000
A
= 25°C. V
100
2V/DIV
2V/DIV
90
80
70
60
50
40
30
20
SW1
SW2
0.1
Li-Ion to 3.3V Efficiency,
Power Loss (f
CONDITIONS
When IC is Enabled
When EA is at Maximum Boost Duty Cycle
V
OPERATION
IN
Burst Mode
SHDN
V
V
I
Switch Pins on the Edge of
Buck/Boost and Approaching Boost
OUT
IN
OUT
= V
V
IN
= 3.42V
= 250mA
= 3.3V
= 5.5V
= 2.5V
OUT
1
OUTPUT CURRENT (mA)
The
= 3.6V, R
OSC
●
V
10
denotes specifications that apply over the full operating temperature
50ns/DIV
IN
= 1MHz)
V
IN
= 3.3V
V
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.
IN
T
= 3.3V
= 60k, unless otherwise noted.
= 4.2V
100
f
OSC
= 1MHz
3440 G02
1000
3440 G05
1000
100
10
1
0.1
2V/DIV
2V/DIV
SW1
SW2
100
90
80
70
60
50
40
30
20
●
0.1
Li-Ion to 3.3V Efficiency
(f
Switch Pins on the Edge of
Buck/Boost and Approaching Buck
V
V
I
OUT
IN
OUT
OSC
OPERATION
Burst Mode
= 4.15V
MIN
= 250mA
0.4
= 3.3V
V
IN
= 2MHz)
= 2.5V
1
OUTPUT CURRENT (mA)
0.01
TYP
380
2.2
90
15
1
50ns/DIV
10
V
LTC3440
IN
V
= 3.3V
IN
MAX
1.5
1
= 4.2V
f
100
OSC
= 2MHz
3440 G03
3440 G06
UNITS
3440fb
3
1000
dB
μA
μA
μA
V
V