LTC3440 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC3440 Datasheet PDF : 20 Pages
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LTC3440
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Pins in Buck Mode
Switch Pins in Boost Mode
VOUT Ripple During Buck,
Buck/Boost and Boost Modes
SW1
2V/DIV
SW2
2V/DIV
SW1
2V/DIV
SW2
2V/DIV
VOUT
10mV/DIV
AC Coupled
Buck
VIN = 5V
Buck/Boost
VIN = 3.78V
Boost
VIN = 2.5V
VIN = 5V
VOUT = 3.3V
IOUT = 250mA
250ns/DIV
3440 G07
VIN = 2.5V
VOUT = 3.3V
IOUT = 250mA
250ns/DIV
3440 G08
L = 10μH
COUT = 22μF
IOUT = 250mA
fOSC = 1MHz
1μs/DIV
3440 G09
Active Quiescent Current
550
VIN = VOUT = 3.6V
Burst Mode Quiescent Current
40
VIN = VOUT = 3.6V
Error Amp Source Current
20
VIN = VOUT = 3.6V
500
30
15
450
20
10
400
–55
–25 5 35 65
TEMPERATURE (°C)
95 125
3440 G10
Output Frequency
1.10
VIN = VOUT = 3.6V
1.05
1.00
0.95
0.90
–55 –25 5
35 65
TEMPERATURE (°C)
95 125
3440 G13
10
–55
–25 5 35 65
TEMPERATURE (°C)
95 125
3440 G11
NMOS RDS(ON)
0.30
VIN = VOUT = 3.6V
SWITCHES B AND C
0.25
5
–55 –25 5 35 65 95 125
TEMPERATURE (°C)
3440 G12
Feedback Voltage
1.236
VIN = VOUT = 3V
0.20
1.216
0.15
0.10
–55 –25 5
35 65
TEMPERATURE (°C)
95 125
3440 G14
1.196
–55 –25 5
35 65
TEMPERATURE (°C)
95 125
3440 G15
3440fb
4
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