LTC3440_15 Datasheet, PDF (4/20 Pages) Linear Technology – Micropower Synchronous Buck-Boost DC/DC Converter

LTC3440
Typical Performance Characteristics
Switch Pins During Buck/Boost
Switch Pins on the Edge of
Buck/Boost and Approaching Boost
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
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
V_IN = 5V
V_OUT = 3.3V
I_OUT = 250mA
250ns/DIV
SW1
2V/DIV
SW2
2V/DIV
3440 G07
V_IN = 2.5V
V_OUT = 3.3V
I_OUT = 250mA
250ns/DIV
V_OUT
10mV/DIV
AC Coupled
3440 G08
L = 10µH
C_OUT = 22µF
I_OUT = 250mA
f_OSC = 1MHz
1µs/DIV
Buck
V_IN = 5V
Buck/Boost
V_IN = 3.78V
Boost
V_IN = 2.5V
3440 G09
Active Quiescent Current
550
V_IN = V_OUT = 3.6V
500
Burst Mode Quiescent Current
40
V_IN = V_OUT = 3.6V
30
Error Amp Source Current
20
V_IN = V_OUT = 3.6V
15
450
20
10
400
–55
–25 5 35 65
TEMPERATURE (°C)
95 125
3440 G10
10
–55
–25 5 35 65
TEMPERATURE (°C)
95 125
3440 G11
4
For more information www.linear.com/LTC3440
5
–55 –25 5
35 65 95 125
TEMPERATURE (°C)
3440 G12
3440fc