參數(shù)資料
型號(hào): LP3923TL-VB
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30
封裝: 3 X 2.50 MM, MICRO SMD-30
文件頁(yè)數(shù): 29/32頁(yè)
文件大小: 1718K
代理商: LP3923TL-VB
Device Description
The LP3923 Charge Management and Regulator Unit is de-
signed to supply charger and voltage output capabilities for
mobile systems, e.g. CDMA handsets. The device provides a
Li-Ion charging function and 8 or 9 regulated outputs. Com-
munication with the device is via an I2C compatible serial
interface that allows function control and status read-back.
The battery charge management section provides a pro-
grammable CC/CV linear charge capability and end of charg-
ing current threshold. Following a normal charge cycle a
maintenance mode utilizing programmable restart voltage
levels enables the battery voltage to be maintained at the
correct level. Power dissipation is thermally regulated to ob-
tain optimum charge levels over the ambient temperature
range.
CHARGER FEATURES
Pre-charge, CC, CV and Maintenance modes
Integrated FET
Integrated Reverse Current Blocking Diode
Integrated Sense Resistor
Thermal Regulation
Charging Current Monitor Output
Programmable charging current 50 mA - 1200 mA with 50
mA steps
Default CC mode current 400 mA
Pre-charging current fixed 50 mA
Termination voltage 4.1V, 4.2V (default), 4.3V and 4.4V
Restart level 50 mV, 100 mV (default), 150 mV and 200
mV below Termination voltage
End of Charge 0,05C, 0.1C, 0.15C (default) and 0.2C
Input voltage operating range 4.5 - 6.8V
REGULATORS
Eight low dropout linear regulators provide programmable
voltage outputs with current capabilities of 80 mA, 150 mA,
and 300 mA as given in the table below. LDO1 and LDO2 are
supplied either by the VBATT (SEL=GND) or by buck
regulator’s output (SEL=VBATT). If the supply voltage is low
(supply from buck), then LDO1 and LDO2 are going to be low-
input low-output (LILO) LDOs.
Buck regulator can provide 700 mA (typ.) of current. If the
buck is used for supplying LDO1 and LDO2 it won’t be able
to supply external devices. If LDO1 and LDO2 are supplied
by VBATT, then buck can be used as an output power channel
for digital loading with the default output voltage value of 1.8V
Under voltage lockout oversees device start up with a preset
level of 3.0V( typ.).
LDOs and Buck Default Voltages (for options LP3923TL/X and LP3923TL/X-VI)
Device
Type
Current
(mA)
Enable
control
Input
Output(V)
Startup
default
Input
Output(V)
Startup
default
SEL=BATT
SEL=GND
Buck
700
SI
VINB=BATT
2.0*
ON
VINB=BATT
1.8*
ON
LDO1
LILO
300
SI
VIN1=VBUCK
1.8
ON
VIN1=BATT
3
ON
LDO2
LILO
300
SI
VIN1=VBUCK
1.8
ON
VIN1=BATT
3
ON
LDO3
D
300
-
VIN2=BATT
3
ON
VIN2=BATT
3
ON
LDO4
A
80
TCXO_EN
VIN2=BATT
3
OFF
VIN2=BATT
3
OFF
LDO5
A
150
RX_EN
VIN2=BATT
3
OFF
VIN2=BATT
3
OFF
LDO6
A
150
TX_EN
VIN2=BATT
3
OFF
VIN2=BATT
3
OFF
LDO7
A
150
SI
VIN2=BATT
3
ON
VIN2=BATT
3
ON
LDO8
D
150
SI
VIN2=BATT
3
OFF
VIN2=BATT
3
OFF
* Voltage is set by the external resistors.
LDOs and Buck Default Voltages (for option LP3923TL/X-VB)
Device
Type
Current
(mA)
Enable
control
Input
Output(V)
Startup
default
Input
Output(V)
Startup
default
SEL=BATT
SEL=GND
Buck
700
SI
VINB=BATT
2.0*
ON
VINB=BATT
1.8*
ON
LDO1
LILO
300
SI
VIN1=VBUCK
1.8
ON
VIN1=BATT
3
OFF
LDO2
LILO
300
SI
VIN1=VBUCK
1.8
ON
VIN1=BATT
3
OFF
LDO3
D
300
-
VIN2=BATT
3
ON
VIN2=BATT
3
ON
LDO4
A
80
TCXO_EN
VIN2=BATT
3
OFF
VIN2=BATT
3
OFF
LDO5
A
150
RX_EN
VIN2=BATT
3
OFF
VIN2=BATT
3
OFF
LDO6
A
150
TX_EN
VIN2=BATT
3
OFF
VIN2=BATT
3
OFF
LDO7
A
150
SI
VIN2=BATT
3
ON
VIN2=BATT
3
ON
LDO8
D
150
SI
VIN2=BATT
3
OFF
VIN2=BATT
3
OFF
* Voltage is set by the external resistors.
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LP3923
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