Datasheet

4
LTC3440
3440fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Active Quiescent Current Burst Mode Quiescent Current Error Amp Source Current
TEMPERATURE (°C)
–55
400
V
IN
+ V
OUT
CURRENT (μA)
450
500
550
–25 5 35 65
3440 G10
95 125
V
IN
= V
OUT
= 3.6V
TEMPERATURE (°C)
–55
10
V
IN
+ V
OUT
CURRENT (μA)
20
30
40
–25 5 35 65
3440 G11
95 125
V
IN
= V
OUT
= 3.6V
TEMPERATURE (°C)
–55
5
E/A SOURCE CURRENT (μA)
10
15
20
–25 5 35 65
3440 G12
95 125
V
IN
= V
OUT
= 3.6V
Output Frequency NMOS R
DS(ON)
Feedback Voltage
TEMPERATURE (°C)
–55
0.90
FREQUENCY (MHz)
0.95
1.00
1.05
1.10
–25 5 35 65
3440 G13
95 125
V
IN
= V
OUT
= 3.6V
TEMPERATURE (°C)
–55
0.10
NMOS R
DS(ON)
(Ω)
0.15
0.20
0.25
0.30
–25 5 35 65
3440 G14
95 125
V
IN
= V
OUT
= 3.6V
SWITCHES B AND C
TEMPERATURE (°C)
–55
1.196
FEEDBACK VOLTAGE (V)
1.216
1.236
–25 5 35 65
3440 G15
95 125
V
IN
= V
OUT
= 3V
Switch Pins in Buck Mode
V
OUT
Ripple During Buck,
Buck/Boost and Boost Modes
SW1
2V/DIV
SW2
2V/DIV
V
IN
= 5V 250ns/DIV 3440 G07
V
OUT
= 3.3V
I
OUT
= 250mA
Switch Pins in Boost Mode
SW1
2V/DIV
SW2
2V/DIV
V
IN
= 2.5V 250ns/DIV 3440 G08
V
OUT
= 3.3V
I
OUT
= 250mA
V
OUT
10mV/DIV
AC Coupled
L = 10μH1μs/DIV
3440 G09
C
OUT
= 22μF
I
OUT
= 250mA
f
OSC
= 1MHz
Buck
V
IN
= 5V
Buck/Boost
V
IN
= 3.78V
Boost
V
IN
= 2.5V