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參數(shù)資料
| 型號： | LTC3109IGN#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.026 A SWITCHING REGULATOR, PDSO20 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大小： | 329K |
| 代理商： | LTC3109IGN#TRPBF |
LTC3109
3109f
on the application and capacitor sizing, since the load on
the VOUT2 output, when enabled, is likely to be orders of
magnitude higher than 8A.
VSTORE
The VSTORE output can be used to charge a large storage
capacitor or rechargeable battery. Once VOUT has reached
regulation, the VSTORE output will be allowed to charge
up to the clamped VAUX voltage (5.25V typical). The
storage element on VSTORE can then be used to power
the system in the event that the input source is lost, or
is unable to provide the current demanded by the VOUT,
VOUT2 and LDO outputs.
If VAUX drops below VSTORE, the LTC3109 will automati-
cally draw current from the storage element. Note that it
may take a long time to charge a large storage capacitor,
depending on the input energy available and the loading
on VOUT and VLDO.
Since the maximum charging current available at the
VSTORE output is limited to about 15mA, it can safely be
used to trickle charge NiCd or NiMH batteries for energy
storage when the input voltage is lost.
Note that VSTORE is not intended to supply high pulse
load currents to VOUT. Any pulse load on VOUT must be
handled by the VOUT reservoir capacitor.
Short-Circuit Protection
All outputs of the LTC3109 are current limited to protect
against short circuits to ground.
Output Voltage Sequencing
Atimingdiagramshowingthetypicalchargingandvoltage
sequencing of the outputs is shown in Figure 1. Note that
the horizontal (time) axis is not to scale, and is used for
illustration purposes to show the relative order in which
the output voltages come up.
operaTion (Refer to the Block Diagram)
5.0
VSTORE
PGOOD
VOUT
VLDO
3.0
2.0
1.0
0
3.0
2.0
1.0
0
2.5
0
5.0
2.5
0
10
20
30
40
TIME (ms)
3109 F01
50
60
70
80
5.0
2.5
VOL
TAGE
(V)
0
VAUX
Figure 1. Output Voltage Sequencing
(with VOUT Programmed for 3.3V). Time Not to Scale
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