LTC3440 Datasheet, PDF (4/20 Pages) Linear Technology – Micropower Synchronous Buck-Boost DC/DC Converter

LTC3440
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Pins in Buck Mode
Switch Pins in Boost Mode
V_OUT Ripple During Buck,
Buck/Boost and Boost Modes
SW1
2V/DIV
SW2
2V/DIV
SW1
2V/DIV
SW2
2V/DIV
V_OUT
10mV/DIV
AC Coupled
Buck
V_IN = 5V
Buck/Boost
V_IN = 3.78V
Boost
V_IN = 2.5V
V_IN = 5V
V_OUT = 3.3V
I_OUT = 250mA
250ns/DIV
3440 G07
V_IN = 2.5V
V_OUT = 3.3V
I_OUT = 250mA
250ns/DIV
3440 G08
L = 10μH
C_OUT = 22μF
I_OUT = 250mA
f_OSC = 1MHz
1μs/DIV
3440 G09
Active Quiescent Current
550
V_IN = V_OUT = 3.6V
Burst Mode Quiescent Current
40
V_IN = V_OUT = 3.6V
Error Amp Source Current
20
V_IN = V_OUT = 3.6V
500
30
15
450
20
10
400
–55
–25 5 35 65
TEMPERATURE (°C)
95 125
3440 G10
Output Frequency
1.10
V_IN = V_OUT = 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 R_DS(ON)
0.30
V_IN = V_OUT = 3.6V
SWITCHES B AND C
0.25
5
–55 –25 5 35 65 95 125
TEMPERATURE (°C)
3440 G12
Feedback Voltage
1.236
V_IN = V_OUT = 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
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