LT1673 LINER [Linear Technology], LT1673 Datasheet - Page 5

• Manufacturer Part Number: LT1673
• Description: Auto-Polarity, Ultralow Voltage Step-Up Converter
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
C1 A OR B
C2 A OR B
–0.25
–0.50
–0.75
–1.00
2V/DIV
2V/DIV
1.00
0.75
0.50
0.25
Start-Up Voltage Sequencing
V
1:100 RATIO TRANSFORMER
C
C
C
IN
OUT
STORE
LDO
0
–50
= 50mV
V
= 220μF
= 2.2μF
Resonant Switching Waveforms
OUT
= 470μF
–25
and VLDO vs Temperature
10SEC/DIV
0
TEMPERATURE (°C)
25
20μs/DIV
50
75
VLDO
V
OUT
3109 G12
100
3109 G06
CH1
VSTORE
1V/DIV
CH2, V
1V/DIV
CH3, V
1V/DIV
3109 G9
125
OUT
LDO
–0.25
–0.50
–0.75
–1.00
5.5
5.4
5.2
5.1
5.0
0.00
1V/DIV
1V/DIV
5.3
V
PGD
CH2
CH1
OUT
0
VAUX Clamp Voltage
vs Shunt Current
0
LDO Load Regulation
V
During a Step Load
50mA LOAD STEP
C
OUT
0.5
OUT
3
VAUX SHUNT CURRENT (mA)
and PGOOD Response
= 220μF
1
LDO LOAD (mA)
1.5
6
5ms/DIV
2
9
2.5
12
3
T
A
3109 G07
3.5
= 25°C, unless otherwise noted.
3109 G10
3109 G13
15
4
20mV/
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
3.0
2.5
2.0
1.5
1.0
0.5
DIV
0
0
0
P
1:100 Ratio, V
LDO Dropout Voltage
V
30μA LOAD
C
VOUT
OUT
OUT
1
0.5
FERROTEC 9500/127/100B
= 220μF
Ripple
2
vs dT and TEG Size,
1
3
LDO LOAD (mA)
1.5
4
100ms/DIV
FERROTEC 9501/071/040B
22mm
OUT
dT (°K)
LTC3109
5
2
= 5V
40mm
6
2.5
7
3
8
3.5
3109 G08
9
3109 G14
3109fa
3109 G11
5
10
4