MP2605DQ [MPS]
Power Supply Support Circuit, Fixed, 1 Channel, QFN-10;
| 型号： | MP2605DQ |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, QFN-10 |
| 文件： | 总13页 (文件大小：1741K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP2605
28V, 1A Li-Ion/Li-Polymer Battery Charger
with Trickle Charge and Timer
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2605 is a linear, high-performance
single cell Li-Ion/Li-Polymer battery charger. By
integrating high voltage input protection into the
charger IC, the MP2605 can tolerate an input
surge up to +28V.
•
•
Proprietary VIN Surge Protection up to 28V
Programmable Charge Current :
200mA to 1.0A
Trickle Charge
40µA Shutdown Current
7V Input OVP
Auto Recharge
Charge-Timer
Fault and Charge Status Indicators
•
•
•
•
•
•
The device features constant current (CC) and
constant voltage (CV) charging modes with
programmable charge currents (200mA to 1A),
current blocking, and trickle charge. The device
also provides fault and charge status
indications to the system.
APPLICATIONS
•
•
•
•
•
Cell Phones
Digital Cameras
Smart Phones
PDAs
For guaranteed safe operation, the MP2605
reduces charge current when the device
reaches high temperature (due to limited PCB
space). Other safety features include battery
temperature monitoring and programmable
timer to complete the charging cycle.
MP3 Players
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
The MP2605 is available in 10-pin 3mm x 3mm
QFN packages.
TYPICAL APPLICATION
3.5V - 6.5V
V
IN
To system
I
BATT
1
10
IN
BATT
9
8
2
NTC
ISET
ACOK
MP2605
3
CHG
V
BATT
4
5
7
6
TMR
GND
SS
SHDN
CSS
ON OFF
MP2605 Rev. 0.94
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (TA)
QFN10 (3mm x 3mm)
MP2605DQ
U4YW
-40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP2605DQ–Z).
For RoHS Compliant packaging, add suffix –LF (e.g. MP2605DQ–LF–Z)
PACKAGE REFERENCE
1
2
3
4
5
10
9
8
7
6
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
3x3 QFN10..............................50 ...... 12...°C/W
θJA
θJC
IN to GND .....................................-0.3V to +28V
ACOK and CHG Maximum Sink Current..... 20mA
All Other Pins to GND..................-0.3V to +6.5V
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-to-
ambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
(2)
Continuous Power Dissipation (TA = +25°C)
………………………………………………....2.5W
Junction Temperature...............................140°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
Recommended Operating Conditions (3)
Nominal Supply Voltage VIN............3.5V to 6.5V
Operating Junct. Temp (TJ)...... -40°C to +125°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB
MP2605 Rev. 0.94
1/25/2010
www.MonolithicPower.com
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© 2010 MPS. All Rights Reserved.
2
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
ELECTRICAL CHARACTERISTICS
VIN = 5V, VSHDN = 0V, TA = +25°C, unless otherwise noted.
Parameter
Symbol
Condition
Min
Typ Max
Units
SHDN = High
40
µA
Supply Current
ISUPPLY
SHDN= Low, ICHG = 0A,
VBATT=4.1V
200
µA
V
Battery Voltage Regulation
Constant Current Regulation
VBATT
ICHG
T = -5°C to +75°C, IBATT = 0
4.16
448
4.20 4.24
515 582
VIN = 5V, VBATT = 3.8V
RCHG = 3.3kΩ
mA
VIN = 5V, VBATT = 3.8V,
TJ = 0°C to +120°C,
RCHG = 1.6kΩ to 8.0kΩ
(4)
Constant Current Variation
87
100 113 %ICHG
(4)
(4)
End of Charge Threshold
Trickle Current
IBF
20
10
%ICHG
%ICHG
V
VIN = 5V, VBATT = 2.3V
5
15
Trickle Threshold Voltage
Trickle Voltage Hysteresis
2.45
2.6 2.75
100
mV
6.7
1.5
7
2
7.3
2.5
V
V
ACOK
Input
Input
Up Range
ACOK
Low Range
ACOK
voltage Clamp
and
Over-
Voltage
CHG
VZ
8.2
V
V
Input
Over
OVP
VIN Rising
6.7
2.6
7
7.3
0.4
Protection
OVP Hysteresis
400
mV
V
SHDN Trip Threshold High
SHDN Trip Threshold Low
SHDN Pull up Current
V
ISHDN
VSHDN=3V
6
µA
Pin Voltage = 0.4V
8
mA
CHG ACOK
,
Sink Current
Battery Reverse Current to
BATT Pin
SHDN = Low and Input =
Floating or 0V
1
µA
VBATT = 3.8V, RCHG =
6kΩ. Current drop 10%
Dropout voltage
VIN-VBATT
0.25
V
Die temperature Limit
105
3.9
120 135
°C
V
Recharge Voltage Threshold VRECHARGE
Recharge Voltage hysteresis
4.0
4.1
100
mV
Note: R_NTC is 100k at 25°C
R_NTC=TH11-4H104F
R_NTC at 0°C
R_NTC at 50°C
376.6
32.3
kΩ
kΩ
Note: R_NTC is 100k at 25°C
R_NTC=TH11-4H104F
MP2605 Rev. 0.94
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
3
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5V, VSHDN = 0V, TA = +25°C, unless otherwise noted.
Parameter
Symbol
Condition
CTMR = 2.2uF
VTMR=0.1V
VTMR=1.5V
Min
Typ Max
Units
Hz
Oscillation Freq
5
TMR Pin Source Current
TMR Pin Sink Current
ITMR1
ITMR2
20
20
µA
µA
From Trickle to 90% Full
Current, CSS=0.1µF
Soft Start Time
70
80
90
mS
Notes:
5) ICHG is the target preprogrammed charge current (Die temperature below 110°C).
MP2605 Rev. 0.94
1/25/2010
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4
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
PIN FUNCTIONS
Pin #
Name
Description
1
2
VIN
Input Supply Pin. VIN receives the AC adapter or USB supply voltage.
Open-Drain Fault Status Indicator. This pin is high under any fault conditions.
ACOK
CHG
Open-Drain Charge Indicator. This pin is low during charging, is high after battery full
or termination, and is toggling when the battery is in fault condition.
3
4
Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set
the oscillator period.
TMR
GND, Exposed
Pad
5
6
The exposed pad and GND pin must be connected to the same ground plane.
SHDN
Charger IC Enable. An input “Low” signal at this pin or pin floating will enable the IC.
Soft-Start. Connect a capacitor to ground to set the soft-start time. The rising time
7
8
SS
3
constant is
, where CSS is in µF.
400 ×10 × CSS
Constant Charge Current Program Pin. Connect this pin to an external resistor to
program the charging current in CC Mode.
ISET
Negative Temperature Coefficient (NTC) Thermistor Pin. Connect a 500kΩ resistor
from this pin to the VIN pin and a 100kΩ NTC resistor (within the battery pack) from
this pin to ground. If NTC function is not used, replace NTC resistor with a regular
100kΩ resistor from this pin to ground. Do not leave this pin floating.
9
NTC
10
BATT
Charger Output.
MP2605 Rev. 0.94
1/25/2010
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5
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
BLOCK DIAGRAM
V
IN
IN
C
IN
1
SS
7
9
NTC
BATT
CHG
I
R
BATT
NTC
10
3
+
V
C
BATT
OUT
TMR
ISET
_
8.2V
4
8
C
TMR
BATTERY
CHARGE
CONTROL
V
Z
R
CHG
ACOK
8.2V
2
V
Z
5
6
GND
SHDN
ON OFF
Figure 1—Functional Block Diagram
MP2605 Rev. 0.94
1/25/2010
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MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
TYPICAL PERFORMANCE CURVES
CIN = 4.7µF, COUT = 2.2 µF, VIN = 5V, TA = +25°C, unless otherwise noted.
Battery Charge Curve
Charge Current vs
Battery Voltage
1000
800
600
400
200
0
5
4
3
2
1
0
1200
1000
800
600
400
200
0
VBAT
ICHG=1A
ICHG=0.8A
ICHG=0.5A
ICHG=0.2A
ICHG
0
30
60 90 120 150 180
TIME (Min)
0
1.0
2.0
3.0
BAT (V)
4.0
5.0
V
1/RSET vs.
Charge Current vs
Battery Voltage
ICHG Current vs
Input Voltage
I
SET
0.6
0.5
0.4
0.3
0.2
0.1
0
1200
1000
800
600
400
200
0
1200
1000
800
600
400
200
0
ICHG=1A
VBAT=4V
ICHG=0.8A
ICHG=0.5A
ICHG=0.2A
VBAT=4.1V
0
200 400
600
800 1000
2.7
3.0
3.3
3.6
3.9
4.2
4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0
ISET (mA)
VIN (V)
V
BAT (V)
Shut Down Low
Shut Down High
Power Ramp Up
V
= 5V, I
SET
Resistor = 2.26K
V
V
= 5V, I
SET
Resistor = 2.26K
V
IN
= 5V, I Resistor = 2.26K
SET
IN
IN
= 3.8V
BAT
V
V
V
IN
IN
IN
5V/div.
5V/div.
CHG
5V/div.
5V/div.
V
V
V
SD
SD
2V/div.
2V/div.
V
V
BAT
BAT
2V/div.
2V/div.
V
BAT
2V/div.
I
I
I
CHG
CHG
CHG
0.5A/div.
0.5A/div.
0.5A/div.
4ms/div.
4ms/div.
4ms/div.
MP2605 Rev. 0.94
1/25/2010
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© 2010 MPS. All Rights Reserved.
7
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
TYPICAL PERFORMANCE CURVES (continued)
CIN = 4.7µF, COUT = 2.2 µF, VIN = 5V, TA = +25°C, unless otherwise noted.
MP2605 Rev. 0.94
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
8
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
battery full threshold is internally programmed
OPERATION
Input Voltage Range
The MP2605 has built-in input voltage surge
protection as high as +28V. The charger IC will
be automatically disabled when the input
voltage is lower than 3.0V or higher than 7.0V.
to be 20% of the ICHG. When the charge current
reaches this threshold, the charger IC will be
automatically turned off.
I
BATT
CC
Charging
I
CHG
The open-drain pin ACOK is used to indicate
an input power good condition (i.e.
3.0V<VIN<7.0V). If the input voltage is lower
than the battery voltage, the IC is also disabled
to prevent the battery from draining.
CV
Charging
Charging
Complete
20% of I
10% of I
Trickle
Charging
CHG
CHG
V
BATT
Charge Cycle (Mode Change: Trickle -> CC->
CV)
2.6V
4.2V
Figure 2—MP2605 Typical Charging Profile
Figure 2 shows the typical charging profile for
the MP2605. For a fully depleted battery with a
terminal voltage lower than 2.6V, the MP2605
will start with the trickle charge (preconditioning)
at 10% of the full charge current based on the
value of RCHG. If the charger stays in trickle
mode longer than 32768 cycles, the battery
fault condition will be indicated by flashing the
Automatic Recharge
When VBATT drops to 4.0V, the charger will
automatically restart the charge cycle until the
20% ICHG condition is met again. When the input
adapter is unplugged, or the charger is disabled
and/or terminated, the leakage current from the
battery to the MP2605 is less than 1uA.
CHG LED. After the battery voltage reaches
2.6V, the charger begins charging using the
programmed charge current (ICHG).This is
referred to as Constant Current (CC) mode.
Once the battery voltage reaches 4.2V, the
charger will operate in the constant voltage (CV)
mode until the battery is fully charged. The
charge current drops during CV mode, and the
battery full indication is set when the charge
current is reduced to 20% of the programmed
constant current value (ICHG). The charge
process is then terminated. Recharge will start
after the battery voltage is reduced to 4.0V.
After 262144 cycles of continuous charging, if
the battery still has not reached 20% of the ICHG
condition, the on-chip timer will terminate the
charger to prevent charging the dead battery
excessively and the fault condition will be
Programming of Charge Current and Battery
Full Current
The charge current (ICHG) is set by a resistor
(RCHG) connected from the ISET pin to GND,
.
RCHG(kΩ) = 1700/ICHG(mA)
The relationship between the charge current
and the programming resistance is established
by the following table and graph.
Table 1—RCHG and ICHG Relationship
RCHG (kΩ)
1.65
1.82
2.05
2.32
2.74
3.3
ICHG (mA)
1000
900
800
700
600
500
flagged by flashing the CHG LED.
4.12
5.6
8.45
15
400
300
200
100
Charge Termination
The charge current will gradually decrease in
CV mode as the battery approaches full. The
MP2605 Rev. 0.94
1/25/2010
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MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
Timer Operation
The TMR pin is used to set the internal
Charge Current vs.
1/R
CHG
µF
CTMR
1000
900
800
700
600
500
400
300
200
oscillator frequency, FOSC = 11Hz×
. The
on-chip timer will start to count down after initial
power-up or every time it is enabled. This timer
will limit the max trickle-charge time to 32768
internal oscillating cycles. If the charger stays in
trickle mode for longer than 32768 cycles, it will
be terminated and a fault will be set by floating
CHG pin. After fault reporting, the charger can
be re-initiated only by recycling the power
supply or SHDN signal. If the charger
successfully goes through trickle charge within
the allowed time limit, it will start CC charging
and then CV charging. If the total charge time
exceeds 262144 cycles and the battery full has
not been qualified, the charger will be
terminated and a fault will also be set by
0
0.1 0.2 0.3 0.4 0.5 0.6
0.7
Figure 3—Charge Current vs. 1/RCHG
Resistance
The recommended resistance for programming
the charge current is 2.3kΩ<RCHG<11kΩ. The
open-drain pin CHG is used to indicate
charging status. When the battery full condition
is met or any other condition prevents the
flashing CHG pin at the rate of half the internal
oscillation frequency. This function prevents
charging a dead battery for prolonged duration.
The timer function can be disabled by shorting
TMR to ground.
charger from charging, CHG will become a
floating pin.
Negative Thermal Coefficient (NTC) Thermistor
The MP2605 has a built-in NTC resistance
window comparator. If configured as the typical
application circuit as indicated in Figure 1, the
MP2605 will cease charging if RNTC<32.3kΩ or
Thermal Protection
The MP2605 has proprietary thermal protection
to prevent the IC from overheating. When in
thermal protection mode, the average charge
current will be reduced to prevent the IC from
overheating. Operating in thermal protection
mode will slow down the charging process.
Lowering the input voltage and enhancing
thermal dissipation to the environment can
effectively prevent the IC from going into
thermal protection mode.
RNTC>376.6kΩ. This represents a valid charging
temperature range of 0°C to 50°C for the
TH11-4H104F NTC resistor.
MP2605 Rev. 0.94
1/25/2010
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© 2010 MPS. All Rights Reserved.
10
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
Under full charge conditions, certain systems
may draw a very narrow current pulse that
Charger Status Indication
The MP2605 has an integrated charge status pin
that remains low while the battery is charging.
Once the charge current threshold (IBF) is
exceeds the IBF threshold. The CHG indicator
may glitch. It is desirable to blank the CHG glitch
so that the system can properly indicate full
charge conditions to the user. A simple solution
reached, the CHG pin will become high
impedance.
For different operation state, CHG indication is as
Table 2 shows.
is to add a RC filter on the CHG pin to filter out
the possible CHG glitch, as shown in Figure 4.
Table 2—CHG Indication for different Charge State
SHDN = High
Ambient
Temperature Fault
Battery Full
HIGH
Time out Fault
In Charging
LOW
Vin Fault
Toggled at the
11×10−6
CTMR (µF)
HIGH
HIGH
CHG
frequency
Hz
ACOK is LOW while 3.0V<VIN<7V, otherwise it is HIGH.
2
3
1
6
CHG
ACOK
IN
10
BAT
SD
9
7
8
4
NTC
SS
ISET
TMR
GND
5
Figure 4—Filtered Charge Status with GPIO Connection
MP2605 Rev. 0.94
1/25/2010
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MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
Figure 5 describes the conditions and operation
APPLICATION
modes of the MP2605. CVC and CCC stand for
“constant voltage charge” and “constant current
charge”, respectively.
Flow Chart of Operation
Power-On Reset (POR) feature can be applied to
the MP2605 to ensure that the device starts
operating in a known state. The flow chart in
POR
NO
VIN>VUVLO
?
After
Termination
32768 Cycles
VBAT<2.6V?
TMR Start
YES
YES
NO
Battery Full
Before 262144
Cycles?
NO
YES
NO
Reset TMR
Turn Off Charger
NO
RCHG
Set up
Charging
Set up?
VBAT<4.0V?
YES
VCHG LED “ON”
YES
VBAT>4.18V
VBAT<2.6V
Which
Charge Mode?
Trickle Charge
2.6V<VBAT<4.18V
C.V.C
YES
NO
VBAT
>2.6V?
C.C.C
NO
ICHG<IBF
Battery Full?
YES
TJ<120°C?
YES
TJ>130°C?
Soft-Off
YES
VCHG LED “Off”
Charger “Off”
NO
NO
Short
YES
Circuit?
NO
NO
VBAT>4.18V?
YES
Figure 5—Flow Chart of Operation
MP2605 Rev. 0.94
1/25/2010
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MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
PACKAGE INFORMATION
QFN10 (3mm x 3mm)
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP2605 Rev. 0.94
1/25/2010
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© 2010 MPS. All Rights Reserved.
13
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