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PDF LP3921 Data sheet ( Hoja de datos )
| Número de pieza | LP3921 | |
| Descripción | Battery Charger Management and Regulator Unit | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet.co.kr
August 26, 2008
LP3921
Battery Charger Management and Regulator Unit with
Integrated Boomer® Audio Amplifier
General Description
The LP3921 is a fully integrated charger and multi-regulator
unit with a fully differential Boomer audio power amplifier de-
signed for CDMA cellular phones. The LP3921 has a high-
speed serial interface which allows for the integration and
control of a Li-Ion battery charger, 7 low-noise low-dropout
(LDO) voltage regulators and a Boomer audio amplifier.
The Li-Ion charger integrates a power FET, reverse current
blocking diode, sense resistor with current monitor output,
and requires only a few external components. Charging is
thermally regulated to obtain the most efficient charging rate
for a given ambient temperature.
LDO regulators provide high PSRR and low noise ideally suit-
ed for supplying power to both analog and digital loads.
The Boomer Audio Amplifier is capable of delivering 1.1 watts
of continuous average power to an 8Ω BTL load with less than
1% distortion (THD+N). Boomer Audio Power Amplifiers were
designed specifically to provide high quality output power with
a minimal amount of external components. The Boomer Au-
dio Amplifier does not require output coupling capacitors or
bootstrap capacitors, and therefore is ideally suited for mobile
phone and other low voltage applications where minimal pow-
er consumption and part count is the primary requirement.
The Boomer Audio Amplifier contains advanced pop & click
circuitry which eliminates noises during turn-on and turn-off
transitions.
Features
■ Charger
— DC adapter or USB input
— Thermally regulated Charge Current
— Under Voltage Lockout
— 50 to 950 mA Programmable Charge Current
■ 3.0V to 5.5V Input Voltage Range
■ Thermal shutdown
■ I2C-compatible Interface for controlling Charger, LDO
outputs and enabling Audio output
■ LDO's
7 Low-Noise LDO’s
— 2 x 300 mA
— 3 x 150 mA
— 2 x 80 mA
2% (typ.) Output Voltage Accuracy on LDO's
■ Audio
— Fully Differential Amplification
— Ability to drive capacitive loads up to 100 pF
— No output coupling capacitors, snubber networks or
bootstrap capacitors required
■ Space- Efficient 32-pin 5 x 5 mm LLP package
Applications
■ CDMA Phone Handsets
■ Low Power Wireless Handsets
■ Handheld Information Appliances
■ Personal Media Players
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 300698
www.national.com
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1 page  
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Device Description
The LP3921 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 7 regulated outputs. Communi-
cation 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. Following a nor-
mal charge cycle a maintenance mode keeps battery voltage
between programmable levels. Power levels are thermally
regulated to obtain optimum charge levels over the ambient
temperature range.
CHARGER FEATURES
• Pre-charge, CC, CV and Maintenance modes
• USB Charge 100 mA/450 mA
• Integrated FET
• Integrated Reverse Current Blocking Diode
• Integrated Sense Resistor
• Thermal regulation
• Charge Current Monitor Output
• Programmable charge current 50 mA - 950 mA with 50 mA
steps
• Default CC mode current 100 mA
• Pre-charge current fixed 50 mA
• Termination voltage 4.1V, 4.2V (default), 4.3V, and 4.4V,
accuracy better than +/- 0.35% (typ.)
• Restart level 100 mV, 150 mV (default) and 200 mV below
Termination voltage
• Programmable End of Charge 0.1C (default), 0.15C, 0.2C
and 0.25C
• Enable Control Input
• Safety timer
• Input voltage operating range 4.5V - 6.0V
REGULATORS
Seven 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, LDO2 and
LDO3 are powered up by default with LDO1 reaching regu-
lation before LDO2 and LDO3 are started. LDO1, LDO3 and
LDO7 can be disabled/enabled via the serial interface. LDO1
and LDO2, if enabled, must be in regulation for the device to
power up and remain powered. LDO4, LDO5 and LDO6 have
external enable pins and may power up following LDO2 as
determined by their respective enable. Under voltage lockout
oversees device start up with preset level of 2.85V (typ.).
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, LDO3) may be programmed to enable/dis-
able once PS_HOLD has been asserted.
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
1
2
3
4
5
6
7
Function
CORE
DIGI
ANA
TCXO
RX
TX
GP
mA
300
300
80
80
150
150
150
Default Voltage (V)
1.8
3.0
3.0
3.0
3.0
3.0
3.0
Startup Default
ON
ON
ON
OFF
OFF
OFF
OFF
Enable Control
SI
-
SI
TCXO_EN
RX_EN
TX_EN
SI
LDO
1 CORE
2 DIGI
3 ANA
4 TCXO
5 RX
6 TX
7 GP
TABLE 2. LDO Output Voltages Selectable via Serial Interface
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
300 + + + + + + + + + + + + + + + +
300 + + + + + + + + + + + + +
80 + + + + + + + +
80 + + + + + + + + + + + + + + + +
150 + + + + + + + +
150 + + + + + + + +
150 + + + + + + + + + + + + + + + +
5 www.national.com
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Charger Electrical Characteristics
Unless otherwise noted, VCHG-IN = 5V, VIN (=VIN1=VIN2=BATT=VDD) = 3.6V.CCHG_IN = 10 µF. Charger set to default settings
unless otherwise noted. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type
apply over the entire junction temperature range for operation, TA = TJ = −25°C to +85°C. (Notes 6, 9)
Symbol
Parameter
Condition
Limit
Typ Units
Min Max
VCHG-IN
Input Voltage Range
Operating Range
(Note 7)
4.5 6.5
V
4.5 6
VOK_CHG
VTERM
CHG_IN OK trip-point
Battery Charge Termination
voltage
VCHG_IN - VBATT (Rising)
VCHG_IN - VBATT (Falling)
Default
200
50
4.2
mV
V
VTERM voltage tolerance
TJ = 0°C to 85°C
ICHG
Fast Charge Current
ICHG = 450 mA
Accuracy
-1 +1 %
-10 +10 %
Programmable full-rate
6.0V ≥ VCHG_IN ≥ 4.5V
charge current range (default
100 mA)
VBATT < (VCHG_IN - VOK_CHG)
VFULL_RATE < VBATT < VTERM
(Note 10)
50 950 mA
Default
100
Charge current programming
step
50
IPREQUAL
ICHG_USB
Pre-qualification current
CHG_IN programmable
current in USB mode
VBATT = 2V
5.5V ≥ VCHG_IN ≥ 4.5V
VBATT < (VCHG_IN -
VOK_CHG)
VFULL_RATE < VBATT <
VTERM
Default = 100 mA
Low
High
50
100
450
100
40
60 mA
mA
VFULL_RATE
Full-rate qualification
threshold
VBATT rising, transition from pre-
qual to full-rate charging
3
2.9 3.1
V
IEOC End of Charge Current, % of 0.1C option selected
full-rate current
10
%
VRESTART
Restart threshold voltage
VBATT falling, transition from EOC
to full-rate charge mode. Default
4.05
3.97
4.13
options selected - 4.05V
V
IMON
TREG
IMON Voltage 1
IMON Voltage 2
Regulated junction
temperature
ICHG = 100 mA
ICHG = 450 mA
(Note 7)
0.247
1.112
115
0.947
1.277
V
°C
Detection and Timing (Note 7)
TPOK
TPQ_FULL
Power OK deglitch time
Deglitch time
VBATT < (VCC - VOK_CHG)
Pre-qualification to full-rate charge
transition
32
230
mS
mS
TCHG
Charge timer
Precharge mode
Charging Timeout
1
5
Hrs
TEOC
Deglitch time for end-of-
charge transition
230 mS
11
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11 Page | ||
| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet LP3921.PDF ] | |
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