LTC3129_15 Datasheet, PDF (6/30 Pages) Linear Technology – 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3A Quiescent Current

LTC3129
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Burst Mode Threshold
vs V_IN and V_OUT
80
70
60
50
40
30
V_OUT = 2.5V
V_OUT = 3.3V
V_OUT = 4.1V
20
V_OUT = 5V
V_OUT = 6.9V
10
V_OUT = 8.2V
V_OUT = 12V
0
V_OUT = 15V
2 4 6 8 10 12 14 16
V_IN (V)
3129 G13
Switch R_DS(ON) vs Temperature
1.3
V_CC = 2.5V
1.2
V_CC = 3V
V_CC = 4V
1.1
V_CC = 5V
1.0
0.9
0.8
0.7
0.6
0.5
0.4
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3129 G14
FB Voltage vs Temperature
(Normalized to 25°C)
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3129 G15
Accurate RUN Threshold
vs Temperature (Normalized to 25°C)
2
1
0
–1
–2
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3129 G16
Average Input Current Limit
vs MPPC Voltage
100
90
80
70
60
50
40
30
20
10
0
1.13 1.135 1.14 1.145 1.15 1.155 1.16 1.165 1.17
MPPC PIN VOLTAGE (V)
3129 G17
Maximum Output Current
vs Temperature (Normalized to 25°C)
15
10
5
0
–5
–10
–15
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3129 G18
V_CC Dropout Voltage vs Temperature
(PWM Mode, Switching)
60
50
V_CC Dropout Voltage vs V_IN
(PWM Mode, Switching)
60
50
Fixed Frequency PWM
Waveforms
SW2
5V/DIV
40
40
SW1
5V/DIV
30
30
I_L
20
20
200mA/DIV
10
0
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3129 G19
10
0
2 2.25 2.5 2.75 3 3.25 3.5 3.75 4
V_IN (V)
3129 G20
L = 10µH
V_IN = 7V
V_OUT = 5V
I_OUT = 200mA
500ns/DIV
3129 G21
3129fb
6
For more information www.linear.com/LTC3129