LP3918TLX-A/NOPB National Semiconductor, LP3918TLX-A/NOPB Datasheet - Page 22

• Manufacturer Part Number: LP3918TLX-A/NOPB
• Description: IC PMU BATT CHRGR/REG 25USMD
• Manufacturer: National Semiconductor

Specifications of LP3918TLX-A/NOPB

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.5 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 25-UFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LP3918TLX-A

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The charger operation may be depicted by the following
graphical representation of the voltage and current profiles.
Further Charger Register Information
Charger Control Register 1
BIT
7
6
5
4
3
2
1
0
TABLE 15. Register Address 8h'10: CHGCNTL1
CHG_MODE
USB_MODE
LDOmode
EN_CHG
EN_EOC
Doubling
EN_Tout
FORCE
TOUT_
NAME
_EOC
_EN
_EN
Set_
FUNCTION (if bit = '1')
Sets the Current Level in USB
mode.
Forces the charger into USB mode
when active high.
If low, charger is in normal charge
mode.
Forces an EOC event.
Doubles the timeout delays for all
timeout signals.
Enables the timeout counters.
When set to '0' the timeout
counters are disabled.
Enables the End of Charge current
level threshold detection. When set
to '0' the functions are disabled.
Forces the charger into LDO mode.
Function available on
LP3918TL_L.
Charger enable.
FIGURE 3. Charge Cycle Diagram
22
Charger Status Register 1 Read only
Charger Status Register 2 Read only
BIT
BIT
7
6
5
4
3
2
1
0
1
0
TABLE 16. Register Address 8h'13: CHGSTATUS1
TABLE 17. Register Address 8h'13: CHGSTATUS2
BAT_OVER
LDO_Mode
Precharge
PRECHG
CHGIN_
OK_Out
Fullrate
Fullrate
ConstV
NAME
NAME
_OUT
Tout_
Tout_
Tout_
BAD_
BATT
EOC
FUNCTION (if bit = '1')
Is set when battery voltage
exceeds 4.7V.
Is set when a valid input voltage is
detected at CHG_IN pin.
Is set when the charging current
decreases below the programmed
End Of Charge levlel.
Set after timeout on full rate
charge.
Set after timeout for precharge
mode.
Only available on LP3918TL_L.
Set when the charger is in CC/CV
mode.
Set during precharge.
FUNCTION (if bit = '1')
Set after timeout in CV phase.
Set at bad battery state.
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