LM3658 [NSC]
Dual Source USB/AC Li Chemistry Charger IC for Portable Applications; 双源USB / AC锂化学充电器IC，适用于便携式应用
| 型号： | LM3658 |
| 厂家： | 
National Semiconductor |
| 描述： | Dual Source USB/AC Li Chemistry Charger IC for Portable Applications |
| 文件： | 总13页 (文件大小：662K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 2005
LM3658
Dual Source USB/AC Li Chemistry Charger IC for
Portable Applications
General Description
Features
n Integrated power FETs with thermal regulation
The LM3658 is a single chip charger IC designed for hand-
held applications. It can safely charge and maintain a single
cell Li-Ion/Polymer battery operating from an AC wall
adapter or USB power source. Input power source selection
of USB/AC is automatic. With both power sources present,
the AC power source has priority. Charge current is pro-
grammed through an external resistor when operating from
an AC wall adapter allowing charge currents from 50 mA to
1000 mA. When the battery is charged using USB power,
charge currents of 100 mA or 500 mA are pin-selectable. The
termination voltage is controlled to within 0.35% of 4.2V.
n Charges from either an AC wall adapter or USB power
source with automatic source selection
n 50 mA to 1000 mA charge currents using AC wall
adapter
n Pin-selectable USB charge currents of 100 mA or
500 mA
n Continuous battery temperature monitoring
n Built-in multiple safety timers
n Charge status indication
n Continuous over-current and temperature protection
n Near-depleted battery pre-conditioning
n Sleep mode with ultra low quiescent current
n On-board Kelvin-sensing achieves 0.35% termination
accuracy
The LM3658 requires few external components and inte-
grates internal power FETs, reverse current protection and
current sensing. The internal power FETs are thermally regu-
lated to obtain the most efficient charging rate for a given
ambient temperature.
n Maintenance mode with automatic recharge
n Thermally enhanced 3 mm x 3 mm LLP package
The LM3658 operates in five modes: pre-qualification mode,
constant-current mode, constant-voltage mode, top-off
mode and maintenance mode. Optimal battery management
is obtained through thermal regulation, battery temperature
measurement and multiple safety timers. The LM3658 pro-
vides two open-drain outputs for LED status indication or
connection to GPIOs.
Applications
n Smartphones
n Digital still cameras
n PDAs
n Hard Drive and flash-based MP3 players
n USB-powered devices
Typical Application
20128201
© 2005 National Semiconductor Corporation
DS201282
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Connection Diagram and Package Mark Information
LLP10 Package Drawing
20128202
Note: The actual physical placement of the package marking will vary from part to part. The package marking “X” is the manufacturing plant code. “YY” is a
2-digit date code, and "ZZ" for die traceability. These codes will vary considerably. "L111B” identifies the device (part number, option, etc.).
TABLE 1. LM3658 Pin Description
Pin #
Name
CHG_IN
Description
1
AC wall adapter input pin.
USB power input pin.
2
3
4
USBpwr
GND
Power and signal ground pin.
USB_sel
Pulling this pin low limits the USB charge current to 100 mA. Pulling this pin high limits the USB
charge current to 500 mA.
5
6
EN_b
Pulling this pin low enables the charger. Pulling this pin high disables the charger.
Active low open-drain output. Indicates charger status. This pin is capable of driving an LED as well
as GPIOs. See Operation Description section for more detail.
STAT2
7
STAT1
ISET
Active low open-drain output. Indicates charger status. This pin is capable of driving an LED as well
as GPIO. See Operation Description section for more detail.
8
A resistor is connected between this pin and GND. The resistor value determines the full-rate charge
current when using the AC source.
9
TS
Battery temperature sense pin. This pin must be connected to battery pack’s temperature sense
output pin. See Operation Description section for more detail.
10
BATT
Positive battery terminal connection.
TABLE 2. Ordering Information
Package
Order Number
Supplied As
Marking
LM3658SD
L111B
1000 units, Tape-and-Reel
4500 units, Tape-and-Reel
LM3658SDX
L111B
For more information on the various options, please refer to Operation Description section.
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Absolute Maximum Ratings (Notes 1,
Operating Ratings (Notes 1, 2)
Input Voltage Range for CHG_IN
Input Voltage Range for USB_pwr
Recommended Load Current
2)
4.5V to 6.0V
4.35V to 6.0V
0 to 1000 mA
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation(Note 3)
Internally Limited
−40˚C to +125˚C
−40˚C to +85˚C
CHG_IN, USBpwr (VCC
)
−0.3V to +6.5V
−0.3V to CHG_IN or USBpwr
Internally Limited
Junction Temperature (TJ) Range
Ambient Temperature (TA) Range
All other pins except GND
Power Dissipation (Note 3)
Junction Temperature (TJ-MAX)
Storage Temperature Range
ESD Rating (Note 4)
+150˚C
Thermal Properties
−65˚C to +150˚C
θ
JA, Junction-to-Ambient Thermal
54˚C/W
Resistance (Note 5)
Human Body Model:
2.0 kV
200V
Machine Model:
Electrical Characteristics Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V.
CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical values and limits appearing in normal type apply for TJ = 25˚C. Limits
appearing in boldface type apply over TJ = 0˚C to +85˚C. (Notes 2, 6, 7)
Limit
Symbol
Parameter
Conditions
Typ
Units
Min
Max
CHARGER
VCHG_IN
AC Wall Adapter
Input Voltage Range
USB Input Voltage
Range
4.5
6.0
6.0
5
V
V
VUSBpwr
ICC_PD
4.35
>
Quiescent Current in VBATT VCC–VOK_CHG
1
µA
Power Down Mode
<
Quiescent Current in VBATT VCC − VOK_CHG
ICC_STBY
>
Standby Mode
VCC VPOR
400
600
2.0
15
µA
µA
EN_b = High
>
IBATT_PD
Battery Leakage
Current in Power
Down Mode
VBATT VCC + VOK_CHG
0.01
7
IBATT_MAINT Battery Leakage
Current in
STAT1 = off, STAT2 = on, adapter or USB
connected, VBATT = 4.2V
µA
mV
V
Maintenance Mode
VOK_CHG
VPOR
CHG_IN or USBpwr VCC – VBATT (Rising)
200
50
OK Trip-Point
VCC – VBATT (Falling)
VCC POR Trip-Point VCC (Rising)
<
VBATT VCC – VOK_CHG
3.0
4.2
<
<
VFULL_RATE VBATT VTERM
VTERM
Battery Charge
Termination Voltage
Battery Charge
Termination Voltage
Tolerance
ICHG = 10% of its value when VBATT = 3.5V
V
TA = 25˚C
−0.35
+0.35
%
TA = 0˚C to 85˚C
−1.5
+1.5
VCHG_DO
VUSB_DO
ICHG
CHG_IN Drop-Out
Voltage
VBATT = VTERM, ICHG = 1A
500
250
mV
mV
>
VCC VBATT + VCHG_DO_MAX
USBpwr Drop-Out
Voltage
VBATT = VTERM, USB_sel = high
>
VCC VBATT + VUSB_DO_MAX
CHG_IN Full-Rate
Charge Current
6V ≥ VCC ≥ 4.5V
<
VBATT VCC – VOK_CHG
<
<
Range (see full-rate VFULL_RATE VBATT VTERM
50
1000
mA
charge mode
description)
ICHG = KISET/RISET
3
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Electrical Characteristics Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V.
CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical values and limits appearing in normal type apply for TJ = 25˚C. Limits
appearing in boldface type apply over TJ = 0˚C to +85˚C. (Notes 2, 6, 7) (Continued)
Limit
Symbol
Parameter
Conditions
Typ
Units
Min
Max
CHARGER
ICHG
CHG_IN Full Rate
Charge Current
RISET = 10kΩ
RISET = 5 kΩ
245
500
760
220
465
700
270
535
820
mA
RISET = 3.3kΩ
KISET
Charge Current Set
Coefficient
6V ≥ VCC ≥ 4.5V
<
VBATT VCC – VOK_CHG
<
<
ICHG = KISET/RISET
(see full-rate charge
mode description)
Charge Current Set
Voltage
VFULL_RATE VBATT VTERM
2500
2.5
AΩ
VISET
6V ≥ VCC ≥ 4.5V
VBATT VCC – VOK_CHG
<
V
<
<
VFULL_RATE VBATT VTERM
IUSB_L
USB Full-Rate
Charge Low Current
USB Full-Rate
Charge High Current
Pre-Qualification
Current
90
450
45
80
400
35
100
500
55
mA
mA
mA
IUSB_H
IPREQUAL
VBATT = 2V, for both AC adapter and USB
VFULL_RATE Full-Rate
Qualification
Threshold
Full Rate Hysteresis VBATT falling
End-of-Charge 6V ≥ VCC ≥ 4.5V
Current, Percent from VBATT VCC – VOK_CHG
VBATT rising, transition from pre-qualification to
full-rate charging
3.0
60
9
2.9
50
7
3.1
70
11
V
mV
%
IEOC
<
<
<
Full-Range Current
Minimum Top-Off
Charge Current
VFULL_RATE VBATT VTERM
ITOPOFF
6V ≥ VCC ≥ 4.5V
VBATT VCC – VOK_CHG
<
2.5
4.0
1.25
3.94
3.75
4.07
%
V
VBATT = VTERM
VRESTART
VTL
Restart Threshold
Voltage
VBATT falling, transition from EOC to
pre-qualification mode
Battery Temperature
Sense Comparator
Low-Voltage
0.49
2.49
0.46
0.52
V
V
Threshold
VTH
Battery Temperature
Sense Comparator
High-Voltage
2.44
94
2.54
106
Threshold
ITSENSE
TREG
TSD
Battery Temperature
Sense Current
Regulated Junction
Temperature
100
120
165
µA
˚C
˚C
Thermal Shutdown
Temperature
DETECTION AND TIMING
<
VBATT VCC – VOK_CHG
TPOK
Power OK Deglitch
60
30
40
27
100
33
ms
Time
TPREQUAL
Pre-Qualification
Timer
mins
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Electrical Characteristics Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V.
CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical values and limits appearing in normal type apply for TJ = 25˚C. Limits
appearing in boldface type apply over TJ = 0˚C to +85˚C. (Notes 2, 6, 7) (Continued)
Limit
Symbol
Parameter
Conditions
Typ
Units
Min
270
Max
330
DETECTION AND TIMING
TPQ_FULL
Deglitch Time for
Pre-Qualification to
Full-Rate Charge
Transition
300
300
ms
ms
TFULL_PQ
Deglitch Time for
Full-Rate to
270
330
Pre-Qualification
Transition
TCHG
TEOC
Charge Timer
Deglitch Time for
End-of-Charge
Transition
300
300
270
270
330
330
min
ms
TBATTEMP
Deglitch Time for
Battery Temperature
Fault
40
40
20
20
80
80
ms
ms
TDGL
Deglitch Time for
EN_b and USB_sel
Pins
TITOPOFF
TTOPOFF
Deglitch Time for
ITOPOFF
300
30
270
27
330
33
ms
Top-Off Charging
Timer
min
I/O
VIL
Low-Level Input
Voltage
EN_b
0
0.7
1.5
V
V
USB_sel
EN_b
VIH
IOL
IOH
High-Level Input
Voltage
1.4
2.5
USB_sel
Low-Level Output
Current
STAT1, STAT2, output voltage = 0.25V
25
10
mA
µA
High-Level Output
Current
STAT1, STAT2, output voltage = 6.0V
0.01
1
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of
the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics tables.
Note 2: All voltages are with respect to the potential at the GND pin.
Note 3: The LM3658 has built-in thermal regulation to regulate the die temperature to 120oC. See Operation Description section for more detail.
Note 4: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin. MIL-STD-883 3015.7
Note 5: Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists,
special care must be paid to thermal dissipation issues in board design. Please refer to application note AN1187 for more detail.
Note 6: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.
Note 7: LM3658 is not intended as a Li-Ion battery protection device; battery used in this application should have an adequate internal protection.
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Block Diagram
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Li-Ion Charging Profile
20128204
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LM3658 Operation Description
POWER-DOWN MODE
The LM3658 will power down automatically when the voltage
on the USBpwr or CHG_IN pin drops below the battery
It is recommended to charge Li-Ion batteries at 1C rate,
where “C” is the capacity of the battery. As an example, it is
recommended to charge a 750 mAh battery at 750 mA, or
1C. Charging at a higher rate can cause damage to the
battery.
>
voltage with an amount that is equal to VOK_CHG (VBATT
VCC - VOK_CHG). Power-Down mode shuts off the internal
power FETs as well as the open-drain pull-down transistors
on the status pins STAT1 and STAT2. The only current
consumed by the LM3658 is an ultra-low quiescent current
of 1 µA typical.
USBpwr FULL-RATE CHARGING MODE
The full-rate charge cycle is initiated following the successful
completion of the pre-qualification mode. Timer TCHG starts
to count when the charger enters full-rate charging, with
STAT1 on and STAT2 off. If the USB bus provides the
charger supply, then the default full-rate charge current is
100 mA max unless the USB_sel pin is pulled high, which
sets the charge current to 500 mA max.
POWER-ON RESET
As soon as the voltage of one of the power sources rises
above VBATT + VOK_CHG, the charger will wake up. However,
charging will not be initiated unless the supply voltage
source exceeds the VPOR
.
AUTOMATIC POWER SOURCE DETECTION
When the voltage of one of the power sources exceeds the
VPOR threshold, the LM3658 detects which power source is
a valid charge supply. When both supply voltages are valid
and present, CHG_IN will automatically be selected over
USBpwr. The USBpwr will be the designated power source
only if no CHG_IN is present or when the voltage on the
CHG_IN pin is less than the battery voltage.
CONSTANT-VOLTAGE CHARGING MODE AND
END-OF-CHARGE (EOC) DETECTION
The battery voltage increases rapidly as a result of full-rate
charging and will reach the 4.2V termination voltage, trigger-
ing the constant-voltage charge cycle. Timer TCHG continues
to count in this cycle. STAT1 is on and STAT2 is off. The
charge current gradually decreases during constant-voltage
charging until it reaches the End-Of-Charge (EOC), which is
equal to 10% of the full-rate current set either by the resistor
connected to the ISET pin or the USB_sel pin. If Timer TCHG
times out before EOC is reached, charging stops and STAT1
and STAT2 will both be on, indicating a bad battery condition.
THERMAL POWER FET REGULATION
The internal power FETs are thermally regulated to the junc-
tion temperature of 120oC to guarantee optimal charging of
the battery. At all times is the charge current limited by the
ISET resistor setting, the USB 100 mA/500 mA selection, or
the 100oC junction temperature of the LM3658. The charge
current is therefore a function of the charge current settings,
the thermal conductivity of the package and the ambient
temperature as described in the following equation:
TOP-OFF CHARGING MODE
Once EOC has been reached, a top-off cycle continues to
charge the battery. Timed top-off cycle provides optimal
battery capacity following a complete charge cycle. During
this cycle, charging terminates when ICHG reaches 2.5% of
the full-rate charge current or when TTOPOFF times out,
whichever occurs first. STAT1 will turn off and STAT2 will turn
on once the top-off cycle completes successfully, indicating
that charging is done.
20128205
Where TA is the ambient temperature and θJA is the thermal
resistance of the package. Thermal regulation guarantees
maximum charge current and superior charge rate without
exceeding the power dissipation limits of the LM3658.
MAINTENANCE MODE
Maintenance mode begins immediately after the charger
successfully finishes the top-off cycle. In the maintenance
mode, the battery voltage is being monitored by the LM3658
continuously. If the battery voltage drops 200 mV below
VTERM, a new full-rate charge cycle starts to replenish the
battery. As this new full-rate charge cycle begins, STAT1 will
turn on and STAT2 will turn off, and all the timers will reset.
Refer to the LM3658 Flowchart.
PRE-QUALIFICATION MODE
During pre-qualification, STAT1 is on and STAT2 is off, and
the charger supplies a constant current of 50 mA to the
battery. When the battery voltage reaches VFULL_RATE, the
charger transitions from pre-qualification to full-rate charg-
ing. The pre-qualification mode aborts when the battery
doesn’t reach VFULL_RATE within the time allowed in
TPREQUAL timer. In this event, charging stops and STAT1 and
STAT2 will both be on, indicating a bad battery condition.
CHARGE STATUS OUTPUTS
The LM3658 provides two open-drain outputs STAT1 and
STAT2 that can be connected to external LEDs or to General
Purpose I/O’s (GPIO) of a peripheral IC. All charge status of
the LM3658 is illustrated in Table 3. “ON” means that STATx
pin is pulled low as its pull-down transistor is turned on,
representing a logic 0.
CHG_IN FULL-RATE CHARGING MODE
The full-rate charge cycle is initiated following the successful
completion of the pre-qualification mode. Timer TCHG starts
to count when the charger enters full-rate charging, with
STAT1 on and STAT2 off. When charging with an AC wall
adapter, the full-rate charge current is proportional to the
value of the resistor that is connected to the ISET pin as
described in the following equation:
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If the TS pin is not used in the application, it should be
connected to GND through 10kΩ pulldown resistor.
When the TS pin is left floating (battery removal), then the
charger will be disabled as the TS voltage exceeds the upper
temperature limit.
LM3658 Operation Description
(Continued)
TABLE 3. Status Pins Summary
STAT1
OFF
STAT2
OFF
Condition
Power-Down, charging is
suspended or interrupted
Pre-qualification mode, CC and CV
charging, Top-off mode
Charge is completed
ON
OFF
OFF
ON
ON
ON
Bad battery (Safety timer expired),
or LDO mode
SAFETY TIMERS
20128210
In order to prevent endless charging of the battery, which
can cause damage to the battery, there are three safety
timers that forcefully terminate charging if the charging mode
is not completed within the time allowed.
The LM3658 battery temperature feature is tailored to use
negative temperature coefficient (NTC) 103AT thermistors
with 10kΩ impedance. If alternative thermistors need to be
used in the system, supplemental external resistors are
needed to create a circuit with equivalent impedance.
Pre-Qualification Timer (TPREQUAL
)
The pre-qualification timer starts with the initiation of the
pre-qualification mode and allows 30 minutes to transition
from pre-qualification to full rate charging. If the battery
voltage does not reach VFULL_RATE in 30 minutes, charging
stops and status pins STAT1 and STAT2 both turn on to
indicate a bad battery status.
Charger Timer (TCHG
)
The charge timer starts with the initiation of full-rate charging
and has a duration of 5 hours for the LM3658. If the charge
current does not reach EOC, charging stops and STAT1 and
STAT2 both turn on to indicate a bad battery status. Once
the charge control declares a bad battery, removing the input
source is the only means to clear the bad battery status.
20128211
DISABLING CHARGER (Charge Interrupt Mode)
Charging can be safely interrupted by pulling the EN_b pin
high and charging can resume upon pulling the EN_b pin
low. The enable pin can be permanently tied to GND with no
extra current consumption penalty during power down mode.
When the charger is disabled, timer holds its count value,
and STAT1 and STAT2 are both off.
Top-Off Timer (TTOPOFF
)
Once the charger successfully completes constant current
constant voltage charging, it enters top-off mode and starts
TTOPOFF timer. Topoff lasts 30 minutes for the LM3658.
During top-off, charging stops when TTOPOFF reaches its
count or when ICHG reaches 2.5% of the full-rate charge
current. There is no time-out condition in top-off mode.
INPUT/OUTPUT BYPASS CAPACITORS
When charging is interrupted either by battery temperature
out of range or disabling the LM3658, the applicable safety
timer will store its count value for the duration of the inter-
ruption and subsequently resumes counting from its stored
count value when charging continues, only if the charger
resumes to the same operation mode it was in before the
interrupt.
Care should be taken to support the stability of the charge
system by connecting a 1 µF capacitor as close as possible
to the BATT pin. An input capacitor ranging from 1.0 µF–
10.0 µF must be connected to the CHG_IN and USBpwr
input pins. Low cost ceramic capacitors can be selected.
THERMAL PERFORMANCE OF THE LLP PACKAGE
The LM3658 is a monolithic device with integrated power
FETs. For that reason, it is important to pay special attention
to the thermal impedance of the LLP package and to the
PCB layout rules in order to maximize power dissipation of
the LLP package.
BATTERY TEMPERATURE MONITORING (Suspend
Mode)
The LM3658 is equipped with a battery thermistor interface
to continuously monitor the battery temperature by measur-
ing the voltage between the TS pin and ground. Charging is
allowed only if the battery temperature is within the accept-
able temperature range set by a pair of internal comparators
inside the LM3658. If the battery temperature is out of range,
STAT1 and STAT2 both turn off and charging is suspended.
Timer holds its count value.
The LLP package is designed for enhanced thermal perfor-
mance and features an exposed die attach pad at the bottom
center of the package that creates a direct path to the PCB
for maximum power dissipation. Compared to the traditional
leaded packages where the die attach pad is embedded
inside the molding compound, the LLP reduces one layer in
the thermal path.
The TS pin is only active during charging and draws no
current from the battery when no external power source is
present.
9
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and outer diameter for thermal vias are 1.27 mm and
0.33 mm respectively. Typical copper via barrel plating is 1
oz, although thicker copper may be used to further improve
thermal performance. The LM3658 die attach pad is con-
nected to the substrate of the IC and therefore, the thermal
land and vias on the PCB board need to be connected to
ground (GND pin).
LM3658 Operation Description
(Continued)
The thermal advantage of the LLP package is fully realized
only when the exposed die attach pad is soldered down to a
thermal land on the PCB board with thermal vias planted
underneath the thermal land. Based on thermal analysis of
the LLP package, the junction-to-ambient thermal resistance
(θJA) can be improved by a factor of two when the die attach
pad of the LLP package is soldered directly onto the PCB
with thermal land and thermal vias, as opposed to an alter-
native with no direct soldering to a thermal land. Typical pitch
For more information on board layout techniques, refer to
Application Note 1187 “Leadless Lead Frame Package
(LLP).” This application note also discusses package han-
dling, solder stencil and the assembly process.
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LM3658 Operation Description (Continued)
20128207
LM3658 Flowcart
11
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LM3658 Operation Description (Continued)
20128206
LM3658 USBpwr Mode Flowcart
20128208
LM3658 CHG_IN Mode Flowcart
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Physical Dimensions inches (millimeters) unless otherwise noted
LLP10 Package Drawing
NS Package Number SDA10A
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the right at any time without notice to change said circuitry and specifications.
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