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參數資料
| 型號： | LP3918TL-L |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Battery Charge Management and Regulator Unit |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA25 |
| 封裝： | 2.50 X 2.50 MM, MICRO, SMD-25 |
| 文件頁數： | 16/30頁 |
| 文件大小： | 1292K |
| 代理商： | LP3918TL-L |
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IMON CHARGE CURRENT MONITOR
Charge current is monitored within the charger section and a
proportional voltage representation of the charge current is
presented at the IMON output pin. The output voltage rela-
tionship to the actual charge current is represented in the
following graph and by the equation:
V
IMON(mV) = (2.47 x ICHG)(mA)
20211611
FIGURE 4. IMON Voltage vs Charge Current
Note that this function is not available if there is no input at
CHG_IN or if the charger is off due to the input at CHG_IN
being outwith the operating voltage range.
LDO Information
OPERATIONAL INFORMATION
The LP3918 has 7 LDO's of which 3 are enabled by default,
LDO's 1,2 and 3 are powered up during the power up se-
quence. LDO4, 5 and 6 are separately, externally enabled
and will follow LDO2 in start up if their respective enable pin
is pulled high. LDO2, LDO3 and LDO7 can be enabled/dis-
abled via the serial interface.
LDO2 must remain in regulation otherwise the device will
power down. While LDO1 is enabled this must also be in reg-
ulation for the device to remain powered. If LDO1 is disabled
via I2C interface the device will not shut down.
INPUT VOLTAGES
There are two input voltage pins used to power the 7LDO's
on the LP3918. V
IN2is the supply for LDO3, LDO4, LDO5,
LDO6 and LDO7. V
IN1is the supply for LDO1 and LDO2.
These input voltages should be tied to the Batt pin in the
application.
PROGRAMMING INFORMATION
Enable via Serial Interface
TABLE 18. Register Address 8h'00: OP_EN
BIT
NAME
FUNCTION
0
LDO1_EN
Bit set to '0' - LDO disabled
Bit set to '1' - LDO enabled
2
LDO3_EN
3
LDO7_EN
Note that the default setting for this Register is [0000 0101].
This shows that LDO1 and 3 are enabled by default whereas
LDO7 is not enabled by default on start up.
LDO OUTPUT PROGRAMMING
TABLE 19.
Regi
ster
Add
(hex)
NAME
Data Range
(hex)
Output Voltage
01
LDO1PGM
O/P
03 - 0F
1.5V to 3.3V
(def. 1.8V)
02
LDO2PGM
O/P
00 - 0F
2.5V to 3.3V
(def 3.0V)
03
LDO3PGM
O/P
05 - 0C
2.7V to 3.05V
(def 3.0V)
04
LDO4PGM
O/P
00 - 0F
1.5V to 3.3V
(def 3.0V)
05
LDO5PGM
O/P
05 - 0C
2.7V to 3.05V
(def 3.0V)
06
LDO6PGM
O/P
05 - 0C
2.7V to 3.05V
(def 3.0V)
07
LDO7PGM
O/P
00 - 0F
1.5V to 3.3V
(def 3.0V)
See Table 2 for full programmable range of values.
EXTERNAL CAPACITORS
The Low Drop Out Linear Voltage regulators on the LP3918
require external capacitors to ensure stable outputs. The
LDO's on the LP3918 are specifically designed to use small
surface mount ceramic capacitors which require minimum
board space. These capacitors must be correctly selected for
good performance
23
www.national.com
LP3918
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LP3918TLX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LP3918TLX/NOPB | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| LP3918TLX-A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Battery Charge Management and Regulator Unit |
| LP3918TLX-A/NOPB | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| LP3918TLX-L | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Battery Charge Management and Regulator Unit |
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