LTC3442 Datasheet, PDF (4/20 Pages) Linear Integrated Systems – Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation

LTC3442
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise specified).
Quiescent Current vs V_IN
(Fixed Frequency Mode)
4.0
3.5
2.0 MHz
3.0
1.5 MHz
2.5
2.0
1.0 MHz
1.5
0.5 MHz
1.0
NO SWITCHING
0.5
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3442 G07
Automatic Burst Mode Threshold
vs R_BURST
160
150
140
LEAVE Burst Mode
OPERATION
130
120
110
100
90
80
ENTER Burst Mode
70
OPERATION
60
150
175
200
225
R_BURST (kΩ)
250
3442 G10
Burst Mode Quiescent Current
vs V_IN
50
45
40
35
30
25
20
15
10
5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3442 G08
Minimum Start Voltage
vs Temperature
2.30
2.29
2.28
2.27
2.26
2.25
2.24
2.23
2.22
2.21
2.20
–55 –25 5 35 65
TEMPERATURE (°C)
95 125
3442 G11
Peak Current Clamp vs V_IN
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.5 3.0
3.5 4.0 4.5
V_IN (V)
5.0 5.5
3442 G09
Average Input Current Limit
vs Temperature (Normalized)
5%
V_IN = V_OUT = 3.3V
4%
3%
2%
1%
0%
–1%
–2%
–3%
– 4%
–5%
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3442 G12
Frequency Change vs Temperature
(Normalized)
2.0%
1.5%
1.0%
0.5%
0.0%
–0.5%
–1.0%
–1.5%
–2.0%
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3442 G13
Feedback Voltage vs Temperature
(Normalized)
1.0%
V_IN = V_OUT = 3.3V
0.8%
0.6%
0.4%
0.2%
0.0%
–2.0%
–0.4%
–0.6%
–0.8%
–1.0%
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3442 G14
4
Switch Pins Before Entering
Boost Mode
SW1
2V/DIV
SW2
2V/DIV
50ns/DIV
V_IN = 2.9V
V_OUT = 3.3V AT 500mA
3442 G15
3442f