LTC3108 Linear Technology, LTC3108 Datasheet - Page 5

• Manufacturer Part Number: LTC3108
• Description: Ultralow Voltage Step-Up Converter and Power Manager
• Manufacturer: Linear Technology

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50mV/DIV
TYPICAL PERFORMANCE CHARACTERISTICS
SW PIN
C1 PIN
2V/DIV
C2 PIN
2V/DIV
V
1:100 RATIO TRANSFORMER
C
CSTORE = 470μF
C
Start-Up Voltage Sequencing
IN
OUT
LDO
= 50mV
V
1:100 RATIO TRANSFORMER
= 220μF
= 2.2μF
IN
LDO Step Load Response
Resonant Switching Waveforms
= 20mV
10sec/DIV
10μs/DIV
3108 G12
3108 G09
CH1
VSTORE
1V/DIV
CH2, V
1V/DIV
CH3, V
1V/DIV
OUT
LDO
CH2, V
V
OUT2_EN
1V/DIV
1V/DIV
1V/DIV
1V/DIV
–0.25
–0.50
–0.75
–1.00
V
OUT2
0.00
PGD
CH1
CH2
CH1
OUT
10mA LOAD ON V
C
0
V
During a Step Load
Enable Input and V
LDO Load Regulation
50mA LOAD STEP
C
OUT
OUT
OUT
0.5
= 220μF
= 220μF
and PGD Response
1
LDO LOAD (mA)
1.5
OUT2
1ms/DIV
5ms/DIV
2
OUT2
2.5
3
T
A
3.5
3108 G13
3108 G16
= 25°C, unless otherwise noted.
3108 G10
4
CH2, V
CH4, V
50mV/DIV
CH1, V
VSTORE
1V/DIV
1V/DIV
1V/DIV
20mV/
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.00
0.04
0.02
CH3
DIV
OUT
LDO
IN
0
LDO Dropout Voltage
V
Running on Storage Capacitor
30μA LOAD
C
OUT
OUT
0.5
= 220μF
Ripple
1
LDO LOAD (mA)
1.5
100ms/DIV
5sec/DIV
LTC3108
2
V
OUT
2.5
CSTORE = 470μF
LOAD = 100μA
3
3.5
5
3108 G14
3108p
3108 G17
3108 G11
4