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LTC3335_15 Datasheet, PDF (10/28 Pages) Linear Technology – Nanopower Buck-Boost DC/DC with Integrated Coulomb Counter
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LTC3335
Typical Performance Characteristics TA = 25°C, BAT = PBAT = 3.6V, GNDA = GNDD =
PGND = 0V, VOUT = PVOUT = 3.3V, 100mA IPEAK setting, unless otherwise noted.
Efficiency vs BAT for 5mA
IPEAK Setting
100
ILOAD = 500µA VOUT = 3.3V
90
ILOAD = 50µA L = 2.2mH
ILOAD = 5µA DCR = 11Ω
80
ILOAD = 1µA
70
60
50
40
30
20
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
BAT (V)
3335 G28
Buck-Boost Maximum Load
vs BAT 250mA IPEAK Setting
100
90
80
70
60
50
40
30
20
VOUT = 1.8V
10
VOUT = 3.3V
0
VOUT = 5V
1.8 2.1 2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
BAT (V)
3335 G29
Buck-Boost Maximum Load
vs BAT 100mA IPEAK Setting
40
36
32
28
24
20
16
12
8
VOUT = 1.8V
4
VOUT = 3.3V
0
VOUT = 5V
1.8 2.1 2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
BAT (V)
3335 G30
Buck-Boost Maximum Load
vs BAT 5mA IPEAK Setting
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
VOUT = 1.8V
0.2
VOUT = 3.3V
0
VOUT = 5V
1.8 2.1 2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
BAT (V)
3335 G31
Buck-Boost Line Regulation,
VOUT = 3.3V, 100mA IPEAK Setting
3.34
ILOAD = 1mA
3.33
ILOAD = 10mA
3.32
3.31
3.30
3.29
3.28
3.27
3.26
1.8 2.1 2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
BAT (V)
3335 G32
Buck-Boost Load Regulation,
VOUT = 3.3V, 100mA IPEAK Setting
3.34
BAT = 1.8V
3.33
BAT = 3.6V
BAT = 5.5V
3.32
3.31
3.30
3.29
3.28
3.27
3.26
0.001
0.01
0.1
1
LOAD CURRENT (mA)
10
3335 G33
Buck-Boost Load Step Transient
OUTPUT
VOLTAGE
20mV/DIV
LOAD
CURRENT
10mA/DIV
2ms/DIV
BAT = 3.6V, VOUT = 3.3V
COUT = 47µF, L = 100µH
LOAD STEP FROM 1mA TO 20mA
3335 G34
Buck-Boost Switching Waveforms
OUTPUT
VOLTAGE
50mV/DIV
SW1
VOLTAGE
5V/DIV
SW2
VOLTAGE
5V/DIV
INDUCTOR
CURRENT
50mA/DIV
20µs/DIV
BAT = 3.6V, VOUT = 3.3V
COUT = 100µF, L = 100µH
100mA IPEAK SETTING
ILOAD = 10mA
3335 G35
Input Quiescent Current Due to
Gate Charge Into PBAT
IPEAK = 5mA
215
IPEAK = 10mA
IPEAK = 15mA
IPEAK = 25mA
IPEAK = 50mA
165
IPEAK = 100mA
IPEAK = 150mA
IPEAK = 250mA
115
65
15
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
BAT (V)
3335 G36
3335p
10
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