LTC3331_15 Datasheet, PDF (9/34 Pages) Linear Technology – Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Charger

LTC3331
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Buck Peak Current
vs Temperature
300
290
V_IN = 5V
280
270
260
250
240
230
220
210
200
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3331 G22
Buck-Boost Line Regulation,
V_OUT = 3.3V
3.400
3.375
C_OUT = 100µF
L = 22µH
IPK[2:0] = 111
3.350
3.325
3.300
3.275
LOAD = 1mA
LOAD = 50mA
3.250
3.225
3.200
2.1 2.4 2.7 3 3.3 3.6 3.9 4.2
BB_IN (V)
3331 G25
R_DS(ON) of Buck PMOS/NMOS
vs Temperature
2.0
V_IN = 5V
1.8
1.6
PMOS
1.4
NMOS
1.2
1.0
0.8
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3331 G23
Buck-Boost Switching Waveforms
OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
SWA
VOLTAGE _0V
2V/DIV
SWB
VOLTAGE
2V/DIV
0V
INDUCTOR
CURRENT
200mA/DIV
0mA
8µs/DIV
BAT = 2.1V, V_OUT = 3.3V
I_LOAD = 10mA
L = 22µH, C_OUT = 100µF
3331 G26
Buck-Boost Load Regulation,
V_OUT = 3.3V
3.40
C_OUT = 100µF
3.38 _{L = 22µH}
3.36 ^{IPK[2:0] = 111}
3.34
3.32
BB_IN = 4.1V
3.30
BB_IN = 2.1V
3.28
3.26
3.24
3.22
3.20
1µ
10µ 100µ 1m
I_LOAD (A)
10m 100m
3331 G24
Buck Load Regulation, 3.3V
3.400
3.375
3.350
V_IN = 4V
C_OUT = 100µF
L = 22µH
3.325
3.300
3.275
3.250
3.225
3.200
1µ
10µ 100µ 1m
I_LOAD (A)
10m 100m
3331 G27
Buck Line Regulation, 3.3V
3.400
3.375
C_OUT = 100µF
L = 22µH
3.350
Buck Switching Waveforms
OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
3.325
3.300
3.275
3.250
3.225
3.200
4
LOAD = 1mA
SW VOLTAGE
10V/DIV 0V
LOAD = 100mA
INDUCTOR
CURRENT
200mA/DIV
0mA
6 8 10 12 14 16 18
V_IN (V)
3331 G28
8µs/DIV
V_IN = 18V, V_OUT = 3.3V
I_LOAD = 10mA
L = 22µH, C_OUT = 100µF
Prioritizer Buck to Buck-Boost
Transition
OUTPUT
VOLTAGE
50mV/DIV
DC-COUPLED,
OFFSET = 3.3V
3331 G29
EH_ON
5V/DIV
0V
BUCK
INDUCTOR
CURRENT
200mA/DIV
BUCK-BOOST ^0mA
INDUCTOR
CURRENT
200mA/DIV
0mA
100µs/DIV
3331 G30
V_IN TRANSITIONS 18V TO 17V, UV[3:0] = 1110
BB_IN = 4.1V, V_OUT = 3.3V
I_LOAD = 50mA, C_OUT = 100µF, L_BUCK = 22µH,
L_BUCK-BOOST = 22µH
For more information www.linear.com/LTC3331
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