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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 290K |
| 代理商： | LTC1559-5 |
9
LTC1559-3.3/LTC1559-5
APPLICATIO
S I
FOR
ATIO
U
W
U
U
ferred for the first two consecutive switch cycles. If V
CC
falls below
V
CC
(rated value) –7% (LTC1559-3.3)
, the
boost operation starts by connecting the SW pin internally
to ground through an internal 0.5
N-channel MOSFET
(N1 in the Block Diagram). The current through the exter-
nal 22
μ
H inductor rises linearly through this switch.
When the switch current reaches an internally preset level
of 165mA, the boost converter connects the SW pin to the
V
BAK
pin through an internal 2
P-channel MOSFET. The
inductor current discharges through the P-channel (P1 in
the Block Diagram) and charges up the system’s V
CC
capacitor (C
OUT
of the system regulator, Figure 1). The
inductor current falls at a rate proportional to the differ-
ence between the backup cell voltage and the output
voltage V
BAK
. When the inductor current reaches zero,
indicating all of its energy has been transferred to the
output capacitor, the LTC1559 monitors the V
CC
voltage.
If V
CC
has increased above the
V
CC
(rated value) –7%
(LTC1559-3.3)
threshold, the boost converter shuts off
both switches and waits for V
CC
to drop below
V
CC
(rated
value) –7% (LTC1559-3.3)
again.
with an internal trimmed V
REF
(1.272V), switching the
LTC1559 into backup mode if V
CC
drops 7%
(LTC1559-3.3) or 7.5% (LTC1559-5) below its rated
value. Upon entering backup mode, the BACKUP pin is
asserted and the internal boost converter turns on. The
BACKUP signal turns off the external P-channel MOSFET
(if used), isolating the system regulator from the LTC1559.
The boost converter charges the V
CC
capacitor, C
OUT
, of
the system regulator until V
CC
rises above V
CC
(rated
value) – 7% (LTC1559-3.3) or V
CC
(rated value) – 7.5%
(LTC1559-5).
Once V
CC
rises above
V
CC
(rated value) – 7% (LTC1559-
3.3)
, the boost converter deactivates and the freshly
charged V
CC
capacitor C
OUT
supplies power to the system.
The cycle repeats again when the V
CC
capacitor’s charge
is drained away and V
CC
again drops below
V
CC
(rated
value) – 7% (LTC1559-3.3)
. The BACKUP pin remains
asserted until the main battery is restored. This ensures
that the LTC1559 does not switch in and out of backup
mode unnecessarily.
The LTC1559’s boost converter minimizes output ripple
under light load conditions by reducing the charge trans-
Figure 1. Typical LTC1559 Connection
+
BOOST
CONVERTER
SYSTEM
REGULATOR
LTC1559
R1
PS
V
CC
R2
1559 F01
BACKUP
LOGIC
V
REF
BACKUP
SYSTEM
V
CC
V
BAK
C
OUT
LIGHT CURRENT MODE
165mA
(PEAK)
330mA
(PEAK)
HEAVY CURRENT MODE
1559 F02
Figure 2. Inductor Current During Switching
Figure 3. V
BAK
Ripple
1
BOOST
CYCLE
V
ESR RIPPLE
DISCHARGE
PERIOD
t
DISCH
CHARGE
PERIOD
t
CH
1559 F03
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