LTC3109 Linear Technology, LTC3109 Datasheet - Page 4

• Manufacturer Part Number: LTC3109
• Description: Ultralow Voltage Step-Up Converter and Power Manager
• Manufacturer: Linear Technology

LTC3109
elecTrical characTerisTics
board layout, the rated thermal package thermal resistance and other
environmental factors. The junction temperature (T
the ambient temperature (T
the formula: T
impedance.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Current measurements are made when the output is not switching.
Typical perForMance characTerisTics

1000
100
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
10
1
10
10
I
Input Resistance vs V
IN
V
V
OUT
OUT
vs V
J
= 0V
= 0V
= T
1:100 RATIO, C1 = 1nF
1:50 RATIO, C1 = 4.7nF
1:20 RATIO, C1 = 10nF
IN
A
+ (P
D
V
V
IN
IN
• θ
100
100
A
1:100 RATIO, C1 = 1nF
1:50 RATIO, C1 = 4.7nF
1:20 RATIO, C1 = 10nF
(mV)
(mV)
) and power dissipation (P
JA
°C/W), where θ
IN
3109 G01
3109 G03
1000
1000
JA
is the package thermal
J
) is calculated from
D
10000
) according to
1000
100
50
45
40
35
10
10
30
25
20
15
5
0
10
10
Efficiency vs V
I
VOUT
V
NO LOAD ON VLDO
V
OUT
OUT
= 3.3V
= 0V
vs V
1:100 RATIO, C1 = 1nF
1:50 RATIO, C1 = 4.7nF
1:20 RATIO, C1 = 10nF
1:100 RATIO, C1 = 1nF
1:50 RATIO, C1 = 4.7nF
1:20 RATIO, C1 = 10nF
IN
V
V
IN
IN
IN
100
100
Note 5: Failure to solder the exposed backside of the QFN package to the
PC board ground plane will result in a thermal resistance much higher
than 37°C/W.
Note 6: The Absolute Maximum Rating is a DC rating. Under certain
conditions in the applications shown, the peak AC voltage on the C2A and
C2B pins may exceed ±8V. This behavior is normal and acceptable because
the current into the pin is limited by the impedance of the coupling
capacitor.
(mV)
(mV)
T
A
3109 G04
3109 G02
= 25°C, unless otherwise noted.
1000
1000
100
0.1
90
80
70
60
50
40
30
20
10
10
0
1
10
0
P
Open-Circuit Start-Up Voltage
vs Source Resistance
1:50 RATIO
C1 = 4.7nF
VOUT
1
vs V
2
SOURCE RESISTANCE ( )
3
IN
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4
V
IN
100
(mV)
5
V
6
OUT
= 5V
7
V
OUT
8
= 3.3V
3109 G05
3109 G18
9
3109f
1000
10