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LTC3331_15 Datasheet, PDF (10/34 Pages) Linear Technology – Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Charger
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LTC3331
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Buck-Boost Load Step Response
Buck Load Step Response
OUTPUT
VOLTAGE
20mV/DIV
AC-COUPLED
OUTPUT
VOLTAGE
20mV/DIV
AC-COUPLED
LOAD
CURRENT
25mA/DIV 1mA
2ms/DIV
BB_IN = 3V, VOUT = 3.3V
COUT = 100µF, L = 22µH
LOAD STEP FROM 1mA TO 50mA
LOAD
CURRENT
25mA/DIV 1mA
3331 G31
2ms/DIV
VIN = 18V, VOUT = 3.3V
COUT = 100µF, L = 22µH
LOAD STEP FROM 1mA TO 50mA
Prioritizer Buck-Boost to Buck
Transition
OUTPUT
VOLTAGE
50mV/DIV
DC-COUPLED,
OFFSET = 3.3V
3331 G32
EH_ON
5V/DIV 0V
BUCK
INDUCTOR
CURRENT
200mA/DIV 0mA
BUCK-BOOST
INDUCTOR
CURRENT
200mA/DIV
0mA
100µs/DIV
3331 G33
VIN TRANSITIONS 17V TO 18V, UV[3:0] = 1110
BB_IN = 4.1V, VOUT = 3.3V
ILOAD = 50mA, COUT = 100µF, LBUCK = 22µH,
LBUCK-BOOST = 22µH
Buck Efficiency vs ILOAD
100
90
80
70
60
50
40
30
20
10
0
1µ
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5V
VIN = 6V, L = 22µH, DCR = 0.19Ω
10µ 100µ 1m
ILOAD (A)
10m 100m
3331 G34
Buck Efficiency vs VIN for
ILOAD = 100mA, L = 22µH
100
VOUT = 1.8V
VOUT = 3.3V
VOUT = 2.5V
VOUT = 3.6V
VOUT = 2.8V
VOUT = 4.5V
95
VOUT = 3V
VOUT = 5V
90
85
80
DCR = 0.19Ω
75
468
10 12 14
VIN (V)
16 18
3331 G35
Buck Efficiency vs VIN for
ILOAD = 100mA, L = 100µH
100
VOUT = 1.8V
VOUT = 3.3V
VOUT = 2.5V
VOUT = 3.6V
VOUT = 2.8V
VOUT = 4.5V
95
VOUT = 3V
VOUT = 5V
90
85
80
DCR = 0.45Ω
75
468
10 12 14
VIN (V)
16 18
3331 G36
Buck Efficiency vs VIN, for
VOUT = 3.3V
100
L = 22µH, DCR = 0.19Ω
90
80
70
60
50
40
30
20
ILOAD = 100mA
ILOAD =100µA
ILOAD =20µA
ILOAD =10µA
10
ILOAD =50µA
ILOAD =5µA
ILOAD =30µA
0
4 6 8 10 12 14 16 18
VIN (V)
3331 G37
Buck-Boost Efficiency vs ILOAD,
250mA IPEAK Setting
100
90
80
70
60
50
40
30
20 BAT = 3.6V
10 L = 22µH
0 RL = 0.36Ω
1µ
10µ
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5.0V
100µ 1m
ILOAD (A)
10m
3331 G39
Buck-Boost Efficiency vs ILOAD,
5mA IPEAK Setting
100
90
80
70
60
50
40
30
20
BAT = 3.6V
10 L = 22µH
DCR = 5.1Ω
0
1µ
10µ
100µ
ILOAD (A)
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5.0V
1m
3331 G38
10
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