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LM3279 датащи(PDF) 8 Page - Texas Instruments

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номер детали LM3279
подробное описание детали  Buck-Boost Converter
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM3279 датащи(HTML) 8 Page - Texas Instruments

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t3 Buck-Boost output settled (90%)
VIO
25 µs max
SDATA
VBATT
VOUT Settling
VOUT
5 µs max
Standby
Switcher is active in normal mode
Init
t0
t3
t2
t1
SW
Hi Z
RFFE write
VOUT = 3.40V
(REG03h, VSET_CTRL= 5Fh)
> 2.7V
3.40V
1.8V (typ)
t2
t1
t0
LM3279 in Standby.
VBATT > 2.7V = VIO = 1.8V (typ)
VOUT programmed LM3279. Initializes and powers up
internal circuit blocks. (Register set to default value.)
t0
t3
t2
t1
VOUT programmed. LM3279 initializes
and powers up internal circuit blocks.
Buck-Boost output settled (90%).
VBATT applied, VIO = 0V.
LM3279 in Shutdown.
t4
VIO
RFFE write
VOUT = 3.42V
(REG03h
VSET_CTRL = 5Fh)
SDATA
VOUT Settling
VOUT
Initialization
3.42V
Shutdown
Low Power
VIO applied.
LM3279 in Low Power.
Switcher is active in normal mode.
VBATT
5 2s (min)
25 2s max
50 2s max
t0
t4
t3
t2
t1
SW
Hi Z
VOUT discharges
LM3279
SNVS970C – MARCH 2013 – REVISED OCTOBER 2014
www.ti.com
Figure 1. Cold Power-Up
Figure 2. Standby To Active
8
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Product Folder Links: LM3279


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