參數(shù)資料
型號(hào): LTC1559-5
廠商: Linear Technology Corporation
英文描述: Backup Battery Controller with Fixed Output(帶固定輸出后備電池控制器)
中文描述: 備用電池控制器(帶固定輸出后備電池控制器具有固定輸出)
文件頁(yè)數(shù): 7/20頁(yè)
文件大小: 290K
代理商: LTC1559-5
7
LTC1559-3.3/LTC1559-5
SWITCHI
G WAVEFOR
S
U
Cold Power Boot-Up Description
1. System regulator starts to ramp up the output (PS)
once the V
BAT
voltage increases beyond the minimum
input value.
2. V
CC
starts to increase once PS is high enough to turn on
Q
EXT
’s body diode. RESET is asserted when V
CC
is less
than or equal to 1V.
W
3. The LTC1559’s internal bandgap wakes up. Q
EXT
turns
on and V
CC
= PS. The LTC1559’s internal boost con-
verter does not turn on as RESET remains asserted.
4. RESET is asserted for a further 200ms after V
CC
reaches
–5.5% of its rated V
CC
value for the LTC1559-3.3 and
–6% of its rated V
CC
value for the LTC1559-5.
Backup Mode (Main Battery Discharged)—
LTC1559-3.3
INDUCTOR
CURRENT
RESET
BACKUP
V
CC
V
NiCd
LOBAT
1559 SW03
t
r
t
r
–7%
1.2V
–7%
–7%
1V
0.9V
–5.5%
BOOST CONVERTER OUTPUT
t
f
t
r
t
r
(4)
(3)
(2)
(1)
“1”
“1”
Backup Mode Description
1. Trigger into Backup Mode. Main battery fails and V
CC
drops 7% below the rated value. The backup pin is
asserted after a t
r
delay time and the boost converter is
turned on.
2. Backup Mode. The LTC1559’s boost converter charges
and discharges the inductor with 165mA peak current.
If V
CC
doesn’t increase above V
CC
(rated value) – 7%
(due to a heavy load), the boost converter increases
peak charging current to 330mA. If V
CC
rises above
V
CC
(rated value) – 7%, the boost converter stops and
the backup pin remains asserted.
3. Recovery from Backup Mode. While the boost con-
verter is running, the main battery is restored. This
causes the system regulator to increase PS above V
CC
.
When PS > V
CC
or V
CC
> V
CC
(rated value) –5.5%, the
BACKUP pin deasserts and the boost converter finishes
its last cycle.
4. Trigger into UVLO. During backup, the 1.2V NiCd cell is
discharged and its terminal voltage falls. The LOBAT pin
is asserted to give an early warning if the cell voltage
drops below 1V. RESET is asserted when the cell
voltage drops below 0.9V and the LTC1559 enters
UVLO mode.
相關(guān)PDF資料
PDF描述
LTC1560-1 1MHz/500kHz Continuous Time, Low Noise, Lowpass Elliptic Filter
LTC1560-1C Advanced,Self-Calibrating, Precision, Dual Operational Amplifier 20-LCCC -55 to 125
LTC1560-1CS8 1MHz/500kHz Continuous Time, Low Noise, Lowpass Elliptic Filter
LTC1560-1I Advanced,Self-Calibrating, Precision, Dual Operational Amplifier 8-CDIP -55 to 125
LTC1560-1IS8 Advanced,Self-Calibrating, Precision, Dual Operational Amplifier 10-CFP -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
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