MP26123DR-LF [MPS]
Power Supply Support Circuit, Adjustable, 1 Channel, 4 X 4 MM, ROHS COMPLIANT, MO-220VGGC, QFN-16;
| 型号： | MP26123DR-LF |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Power Supply Support Circuit, Adjustable, 1 Channel, 4 X 4 MM, ROHS COMPLIANT, MO-220VGGC, QFN-16 |
| 文件： | 总16页 (文件大小：758K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP26123
2A,24V Input, 600kHz
2/3-Cell Switching Li-ion Battery Charger
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP26123 is a monolithic DC-DC step-
down switching charger for 2- or 3-cell Li-ion
battery packs. It has an integrated high-side
power MOSFET can output up to a 2A charge
current. It also has peak-current–mode control
for fast loop response and easy compensation.
Charges 2- or 3-Cell Li-Ion Battery Packs
Wide Operating Input Range
Programmable Charging Current of up to 2A
±0.75% VBATT Accuracy
0.2Ω Integrated Power MOSFET
Up to 90% Efficiency
Fixed 600kHz Frequency
Preconditioning for Fully Depleted Batteries
Charging Status Indicator
Input Supply Fault Indicator
Thermal Shutdown
Cycle-by-Cycle Over-Current Protection
Battery Temperature Monitor and Protection
The MP26123 uses a sense resistor to control a
programmable charge current, and accurately
regulates the charge current and charge
voltage using two control loops.
The MP26123 has multiple fault condition
protections that include cycle-by-cycle current
limiting and thermal shutdown. Other safety
features include battery temperature monitoring
and protection, charge status indication and
programmable timer to cease the charging
cycle when timer out.
APPLICATIONS
Mobile Internet Device
Portable Media Player
Netbook
Charger for 2- or 3-Cell Li-Ion Batteries
Distributed Power Systems
The MP26123 requires a minimal number of
readily-available external components.
The MP26123 is available in a 4mm x 4mm 16-
pin QFN package.
For MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (TA)
MP26123DR
QFN16 (4x4mm)
M26123
-40°C to +85°C
*For Tape & Reel, add suffix –Z (e.g. MP26123DR–Z)
For RoHS compliant packaging, add suffix –LF (e.g. MP MP26123DR–LF–Z)
PACKAGE REFERENCE
TOP VIEW
PIN 1 ID
VIN
SW
BST TMR
16
15
14 13
VCC
NTC
1
2
3
4
12 GND
11
CSP
ACOK
CHGOK
10 BATT
9
COMPI
5
6
7
8
VREF33 EN CELLS COMPV
EXPOSED PAD
ON BACKSIDE
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VCC, VIN ............................ 26V
Thermal Resistance (4)
QFN16 (4x4mm).....................46...... 10... °C/W
θJA
θJC
V
V
V
V
SW..................................... -0.3V to (VIN + 0.3V)
BST ......................................................VSW + 6V
CSP, VBATT, ...................................-0.3V to +18V
ACOK, VCHGOK, ..............................-0.3V to +26V
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
All Other Pins..................................-0.3V to +6V
(2)
any
ambient
temperature
is
calculated
by
Continuous Power Dissipation
(TA = 25°C)
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.
............................................................. 2.7W
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
Recommended Operating Conditions (3)
Supply Voltage VIN ..............................9V to 24V
Maximum Junction Temp. (TJ)..................125°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7 4-layer board.
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
2
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS
VIN = 19V, TA = 25°C, CELLS=0V, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
8.4
12.6
1
Max
8.463
12.695
Units
CELLS=0V
8.337
12.505
Terminal battery voltage
VBATT
V
CELLS=Float
CSP，BATT current
Switch on resistance
Switch leakage
ICSP,IBATT Charging disabled
µA
Ω
RDS(ON)
0.2
0
1
μA
EN= 4V, VSW = 0V
CC(5)
4.1
2
A
A
Peak current limit
TRICKLE
CC current
ICC
ITRICKLE
VTC
RS1=100mΩ
1.8
5%
2.0
10%
3
2.2
A
Trickle charge current
Trickle charge voltage threshold
Trickle charge hysteresis
Termination current threshold
ICC
V/cell
mV
ICC
350
10%
IBF
15%
230
CELLS=0V,
Oscillator frequency
fSW
600
190
kHz
VBATT =7V
Fold-back frequency
Maximum duty cycle
VBATT =0V
kHz
%
90
Maximum current sense voltage
(CSP to BATT)
Minimum on time (5)
VSENSE
tON
170
200
100
3.2
mV
ns
V
Under-voltage lockout threshold
rising
3
5
3.4
Under-voltage lockout threshold
hysteresis
200
30
1000
mV
mA
min
Open-drain sink current
VDRAIN =0.3V
In trickle mode
Dead battery indicator
C
TMR=0.1μF
Recharge threshold at VBATT
Recharge hysteresis
VRECHG
4.0
V/cell
mV
100
%of
VREF33
NTC low-temp rising threshold
NTC high-temp falling threshold
RNTC=NCP18X103, 0°C
NTC=NCP18X103,
70.5
27.5
73.5
29.5
180
76.5
31.5
R
%of
VREF33
50°C
VIN min head-room (reverse
blocking)
VIN−VBATT
mV
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
3
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 19V, TA = 25°C, CELLS=0V, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
0.4
V
EN input low voltage
EN input high voltage
1.8
V
4
EN
EN
=4V
=0V
μA
EN input current
0.2
0.5
mA
mA
mA
EN=4V
EN=4V,
Supply current (shutdown)
Supply current (quiescent)
Thermal shutdown (5)
VREF33 output voltage
VREF33 load regulation
Consider VREF33 pin
output current,
R3=10k,RNTC=10k
0.665
2.0
EN=0V, CELLS=0V
150
3.3
30
°C
V
ILOAD =0 to 10mA
mV
Notes:
5) Guaranteed by design.
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
4
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
PIN FUNCTIONS
Pin #
Name Description
1
VCC
IC supply voltage.
Thermistor Input. Connect a resistor from this pin to VREF33, and the thermistor from this
pin to ground.
2
3
NTC
Valid Input Supply Indicator. Open drain output. Add pull-up resistor. Logic LOW indicates
the presence of a valid input supply.
ACOK
CHGOK
VREF33
Charging Status Indicator. Open drain output. Add pull-up resistor. Logic LOW indicates
normal charging. Logic HIGH indicates either a completed charge process or suspended
process because of some fault.
4
Internal Linear Regulator, 3.3V Reference Output. Bypass to GND with a 1μF ceramic
capacitor.
5
6
On/Off Control Input.
EN
Command Input for the Number of Li-ion Cells. Connect to VREF33 or float for 3-cell
operation. Ground for 2-cell operation.
7
8
CELLS
COMPV V-LOOP Compensation. Decouple this pin with a capacitor and a resistor.
9
COMPI I-LOOP Compensation. Decouple this pin with a capacitor and a resistor.
10
BATT Positive Battery Terminal.
Battery-Charge Current-Sense–Positive Input. Connect a resistor RS1 between CSP and
200mV
11
CSP
I
CHG
A
BATT. The full charge current is:
.
RS1
mΩ
Ground. This pin is the voltage reference for the regulated output voltage. This node should
be placed outside of the switching diode (D2) to the input ground path to prevent switching
current spikes from inducing voltage noise into the part.
12
13
GND
TMR
Set Safe Timer Period. 0.1µA current charges and discharges the external capacitor
decoupled to GND. The capacitor value programs the timer period.
Bootstrap. Requires a charged capacitor to drive the power switch’s gate above the supply
voltage. Connect a capacitor between SW and BST pins to form a floating supply across the
power switch driver.
14
15
16
BST
SW
VIN
Switch Output.
Regulator Input Voltage. The MP26123 regulates a 9V-to-24V input to a voltage suitable for
charging either a 2- or 3-cell Li-ion battery. Requires capacitors to prevent large voltage
spikes from appearing at the input.
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
5
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=100mΩ, Real/Simulation Battery Load, TA=25°C,
unless otherwise noted.
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
6
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=100mΩ, Real/Simulation Battery Load, TA=25°C,
unless otherwise noted.
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
7
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=100mΩ, Real/Simulation Battery Load, TA=25°C,
unless otherwise noted.
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
8
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
FUNCTIONAL BLOCK DIAGRAM
Figure 1—Functional Block Diagram
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
9
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
OPERATION
The MP26123 is a peak-current–mode controlled
switching charger for use with Li-ion batteries.
If the charge stays in the “trickle-charging mode”
until “time out” condition is triggered, charging
terminates and will not resume until the input
power or EN signal refreshes. Otherwise, GMI
regulates the charge current to the level set by
RS1. The charger is operating at “constant
current charging mode.” The duty cycle of the
switcher is determined by the COMPI voltage
that is regulated by the amplifier GMI.
At the beginning of a cycle, M1 is off, and the
COMP voltage is higher than the output of
current sense amplifer, A1. The PWM
comparator’s output is low, and the rising edge of
the 600kHz CLK signal sets the RS flip-flop,
which turns on M1, thus connecting the SW pin
and the inductor to the input supply.
When the battery voltage reaches constant-
voltage–mode threshold, GMV regulates the
COMP pin and the duty cycle for constant
voltage mode. When the charge current drops to
the battery-full threshold, IBF (typical 10% CC),
the battery is defined as fully charged, the
charger stops charging, and CHGOK goes high
to indicate the charge-full condition. If the total
charge time exceeds the timer period, the
charging terminates at once and will resume
when either the input power or EN signal can
restart the charger.
As the inductor current increases, the output of
A1 increases. While the sum of A1’s output and
the slope compensation remains below the
COMP voltage, the falled edge of the CLK resets
the RS flip-flop. When this signal exceeds the
COMP voltage, the RS flip-flop resets and turns
M1 off. The external switching diode D2 then
conducts the inductor current.
The MP26123 uses COMP to select the smaller
value of GMI and GMV to implement either
current loop control or voltage loop control.
Current loop control occurs when the battery
voltage is low, which results in the saturation of
the GMV output. GMI compares the charge
current (as a voltage sensed through RS1)
against the reference voltage to regulate the
charge current to a constant value. When the
battery voltage charges up to the reference
voltage, the output of GMV goes low and initiates
voltage loop control to control the duty cycle to
regulate the output voltage.
Figure 2 shows the typical charge profile of
MP26123.
The MP26123 has an internal linear regulator—
VREF33—to power internal circuitry. It can also
power external circuitry as long as the load does
not exceed the maximum current (30mA).
Connect a 1μF bypass capacitor from VREF33 to
GND to ensure stability.
Figure 2—Li-Ion Battery Charge Profile
Charge Cycle (Mode change: Trickle CC
CV)
At the start of a charging cycle, the MP26123
monitors VBATT. If VBATT is lower than the trickle-
charge threshold, VTC (typically 3.0V/cell), the
charging cycle will start in “trickle-charge mode”
(10% of the RS1 programmed constant-charge
current, ICC) until the battery voltage reaches VTC.
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
10
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
Automatic Recharge
auto-recharge (The event that VBATT falls through
4V/cell) can restart the charge cycle.
After the battery has completely recharged, the
charger disables all blocks except the battery
voltage monitor to limit leakage current. If the
battery voltage falls below 4.0V/Cell, the chip will
begin recharging using soft-start. The timer will
then reset to avoid timer-related charging
disruptions.
Negative Thermal Coefficient (NTC)
Thermistor
The MP26123 has a built-in NTC-resistance
window comparator that allows the MP26123 to
sense the battery temperature through the
thermistor included in the battery pack. Connect
a resistor with an appropriate value from VREF33
to the NTC pin, and connect the thermistor from
the NTC pin to GND. A resistor divider
determines the voltage on the NTC pin as a
function of the battery temperature. Charging
halts when the NTC voltage falls below the lower
NTC window threshold. Charging resumes when
the voltage is within the NTC window range.
Charger Status Indication
MP26123 has two open-drain status outputs:
CHGOK
ACOK and
. The ACOK pin goes low
when the IC supply voltage VCC exceeds the
under-voltage lockout threshold and the
regulated voltage VIN is 300mV higher than VBATT
to make sure the regulator can operate normally.
CHGOK
indicates charge status. Table 1
Power Path Management
CHGOK
describes ACOK and
different charge conditions.
outputs under
MP26123 is a stand-alone switching charger.
Typically, the regulated input voltage VIN
receives power from the adapter input, VIN,
through a diode that blocks the battery voltage to
VCC. For power path application, however, VIN
powers the system and charges the battery
simultaneously so the user can start-up a device
with a drained battery when it is connected to an
adapter. Replace the diode from the stand-alone
switching charger circuit with a MOSFET to
improve system efficiency and reduce voltage
drop of the block device.
Table 1―Charging Status Indication
Charger Status
ACOK
CHGOK
low
low
In charging
End of charge, NTC
fault, timer out, thermal
low
high
high
shutdown, EN disable
VIN –VBATT<0.3V.
VCC<UVLO,
high
Timer Operation
An additional MOSFET between VIN and the
battery allows the battery to charge even in the
absence of an adapter or connection to an invalid
adapter. Figure 3 shows a typical application
circuit with power-path management. When the
adapter input is invalid or absent, the block diode
MP26123 uses the internal timer to limit the
charge period during trickle charge and total
charge cycle. Once the charge time exceeds the
time limit the MP26123 terminates charging. A
good battery should fully recharge within the
allotted time period; otherwise the battery has a
fault. An external capacitor at the TMR pin
programs the time period.
is replaced by a MOSFET controlled by ACOK
signal.
The trickle mode charge time is:
CTMR
TTRICKLE _ TMR 30mins
0.1F
The total charge time is:
CTMR
TTOTAL _ TMR 3hours
0.1F
When time-out occurs, charger is suspended.
And only refresh the input power or EN signal or
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
11
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
R6
10k
D2
Figure 3—MP26123 with Power-Path Management
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
12
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
OPERATION FLOW CHART
Figure 4— Normal Charging Operation Flow Chart
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
13
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
OPERATION FLOW CHART (continued)
Figure 5—Fault Protection Flow Chart
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
14
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
According to equation (4) and equation (5), we
determine R3 = 9.63k and R6 = 505k.
APPLICATION INFORMATION
Setting the Charge Current
For simplification, select R3=10k and R6 no
connect to approximate the specification.
The charge current of MP26123 is set by the
sense resistor RS1 (See Typical Application), and
determined with the following equation:
200mV
ICHG
A
(1)
VREF33
RS1
mΩ
Selecting the Inductor
Low Temp Threshold
Use a 1µH to 10µH inductor for most applications.
The inductance value can be derived from the
following equation.
R3
VTH_Low
NTC
RNTC
R6
VOUT (V VOUT
)
IN
L
(2)
V IL fOSC
IN
High Temp Threshold
Where ΔIL is the inductor ripple current. Choose
ΔIL to be approximately 30% of the maximum
charge current, 2A. VOUT is the 2- or 3-cell battery
voltage.
VTH_High
Figure 6— NTC function block
Selecting the Input Capacitor
The maximum inductor peak current is:
The input capacitor reduces the surge current
drawn from the input and also the switching noise
from the device. Chose an input capacitor with an
impedance at the switching frequency less than
the input source impedance to prevent high-
frequency–switching current. Use ceramic
capacitors with X5R or X7R dielectrics with low
ESR and small temperature coefficients. A 4.7µF
capacitor is sufficient for most applications.
IL
2
IL(MAX) ICHG
(3)
Under light load conditions below 100mA, use a
larger inductor value to improve efficiency.
Select an inductor with a DC resistance of less
than 200mꢀ to optimize efficiency.
NTC Function
As Figure 6 shows, the low temperature threshold
and high-temperature threshold are preset
internally to 73.5%·VREF33 and 29.5%·VREF33
using a resistive divider. For a given NTC
thermistor, we can select appropriate R3 and R6
resistors to set the NTC window.
Selecting the Output Capacitor
The output capacitor limits output voltage ripple
and ensures regulation loop stability. The output
capacitor impedance should be low at the
switching frequency. Use ceramic capacitors with
X5R or X7R dielectrics.
For the thermistor (NCP18XH103) noted in above
electrical characteristic,
PC Board Layout
Connect the high frequency and high current
paths (GND, IN and SW) to the device with short,
wide, and direct traces. Place the input capacitor
as close as possible to the IN and GND pins.
Place the external feedback resistors next to the
FB pin. Keep the switching node SW short and
away from the feedback network.
At 0°C, RNTC_Cold = 27.445k;
At 50°C, RNTC_Hot = 4.1601k.
Assuming that the NTC window is between 0°C
and 50°C, we can derive the following equations:
R6//RNTC _ Cold
VTH_Low
(4)
73.5%
29.5%
R3 R6//RNTC _ Cold VREF33
R6//RNTC _Hot
VTH_High
R3 R6//RNTC _Hot VREF33
(5)
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
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© 2011 MPS. All Rights Reserved.
15
MP26123 – 2A, 24V INPUT, 600kHz 2-3 CELL SWITCHING LI-ION BATTERY CHARGER
PACKAGE INFORMATION
QFN16 (4 x 4mm)
3.90
4.10
2.15
2.45
PIN 1 ID
SEE DETAIL A
0.50
0.70
13
16
PIN 1 ID
MARKING
0.25
12
1
4
0.35
3.90
4.10
2.15
2.45
0.65
BSC
PIN 1 ID
INDEX AREA
9
8
5
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
0.45x45º TYP.
PIN 1 ID OPTION B
R0.25 TYP.
0.80
1.00
0.20 REF
0.00
0.05
DETAIL A
SIDE VIEW
3.80
2.30
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) JEDEC REFERENCE IS MO-220, VARIATION VGGC.
5) DRAWING IS NOT TO SCALE.
1.00
0.35
0.65
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
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.
MP26123 Rev. 1.01
10/28/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
16
相关型号：
MP2612ER-LF-Z
Power Supply Support Circuit, Fixed, 1 Channel, 4 X 4 MM, ROHS COMPLIANT, MO-220VGGC, QFN-16
MPS
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