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| 型号： | LTC1559CS8-3.3 |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC BACKUP BATT CNTRLR 3.3V 8SOIC |
| 标准包装： | 100 |
| 功能： | 备份管理 |
| 电池化学： | 镍镉 |
| 电源电压： | 2.9 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
LTC1559-3.3/LTC1559-5
APPLICATIO N S I N FOR M ATIO N
SYSTEM
V CC
+
V CC
SYSTEM
REGULATOR
LTC1559
R1
BOOST
CONVERTER
BACKUP
LOGIC
V BAK
C OUT
BACKUP
R2
V REF
PS
1559 F01
Figure 1. Typical LTC1559 Connection
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-
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.
1
BOOST
CYCLE
330mA
165mA
(PEAK)
(PEAK)
V BAK
ESR RIPPLE
DISCHARGE
CHARGE
1559 F03
LIGHT CURRENT MODE
HEAVY CURRENT MODE
1559 F02
PERIOD
PERIOD
t DISCH
t CH
Figure 2. Inductor Current During Switching
Figure 3. V BAK Ripple
9
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