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参数资料
| 型号： | LP3918TLX-I |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA25 |
| 封装： | 2.50 X 2.50 MM, MICRO, SMD-25 |
| 文件页数： | 26/30页 |
| 文件大小： | 1271K |
| 代理商： | LP3918TLX-I |
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POWER SUPPLY CONFIGURATIONS
At PMU start up, LDO1, LDO2 and LDO3 are always started
with their default voltages. The start up sequence of the LDO's
is given below.
Startup Sequence
LDO1 -> LDO2 -> LDO3
LDO's with external enable control (LDO4, LDO5, LDO6) start
immediately after LDO2 if enabled by logic high at their re-
spective control inputs.
LDO7 (and LDO1 and 3) may be programmed to enable/dis-
able once PS_HOLD has been asserted.
2 shows the voltages that may be programmed via the Serial
Interface.
DEVICE PROGRAMMABILITY
An I2C compatible Serial Interface is used to communicate
with the device to program a series of registers and also to
read status registers. These internal registers allow control
over LDO outputs and their levels. The charger functions may
also be programmed to alter termination voltage, end of
charge current, charger restart voltage, full rate charge cur-
rent, and also the charging mode.
This device internal logic is powered from LDO2.
TABLE 1. LDO Default Voltages
LDO
Function
mA
Default Voltage (V)
Startup Default
Enable Control
1
CORE
300
1.8
ON
SI
2
DIGI
300
3.0
ON
-
3
ANA
80
3.0
ON
SI
4
TCXO
80
3.0
OFF
TCXO_EN
5
RX
150
3.0
OFF
RX_EN
6
TX
150
3.0
OFF
TX_EN
7
GP
150
3.0
OFF
SI
TABLE 2. LDO Output Voltages Selectable via Serial Interface
LDO
mA
1.5
1.8
1.85
2.5
2.6
2.7
2.75
2.8
2.85
2.9
2.95
3.0
3.05
3.1
3.2
3.3
1
CORE
300
+
2
DIGI
300
+
3
ANA
80
+
4
TCXO
80
+
5
RX
150
+
6
TX
150
+
7
GP
150
+
5
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LP3918
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