ltc3440 Linear Technology Corporation, ltc3440 Datasheet - Page 4

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

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