MP2615C
2.1A, 1-Cell or 2-Cell Li-Ion Battery Charger
in (3mmx3mm) Package
DESCRIPTION
FEATURES
The MP2615C is a high-efficiency, switch-mode
battery charger suitable for single-cell or dualcell Li-ion or Li-polymer applications. The
device is capable of delivering 2.1A of charge
current, which can be configured via an
accurate current-sense resistor across the
entire input range.
•
•
•
•
•
•
•
•
The MP2615C regulates the charge current and
full battery voltage using two control loops to
achieve high-accuracy constant current (CC)
charge and constant voltage (CV) charge.
•
•
•
•
•
•
Constant-off-time (COT) control allows the
device to operate up to 99% duty cycle when
the battery voltage is close to the input voltage.
This maintains a relatively high charging
current.
The battery temperature and charging statuses
are always monitored during each charging
cycle. Two status monitor output pins are
provided to indicate the battery charging status
and input power status. The MP2615C also
features internal reverse blocking protection.
•
4.75V to 18V Operating Input Voltage
Up to 99% Duty Cycle Operation
Up to 2.1A Configurable Charging Current
±0.75% Full Battery Voltage Accuracy
4.1V/Cell and 4.2V/Cell Selection for Full
Battery Voltage
Fully Integrated Power Switches
Internal Loop Compensation
No External Reverse Blocking Diode
Required
Preconditioning for Fully Depleted Battery
Charging Operation Indicator
Configurable Safety Timer
Thermal Shutdown Protection
Cycle-by-Cycle Over-Current Protection
Battery Temperature Monitoring and
Protection
Available in a QFN-16 (3mmx3mm)
Package
APPLICATIONS
•
•
•
The MP2615C is available in a QFN-16
(3mmx3mm) package.
Smartphones
Portable Handheld Solutions
Portable Media Players
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance.
“MPS”, the MPS logo, and “Simple, Easy Solutions” are trademarks of
Monolithic Power Systems, Inc. or its subsidiaries.
TYPICAL APPLICATION
L
5V to 18V Input
RS1
SW
VIN
R2
C4
CHGOK
BST
ACOK
CSP
R1
C1
RNTC
MP2615C
VCC
BATT
NTC
TMR
EN
SEL
C2
R3
C3
1-Cell or
2-Cell
Battery
100k
ON OFF
AGND
PGND
CELL
CTMR
MP2615C Rev. 1.1
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6/15/2023
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1
MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
ORDERING INFORMATION
Part Number*
MP2615CGQ
Package
QFN-16 (3mmx3mm)
Top Marking
See Below
MSL Rating
1
* For Tape & Reel, add suffix –Z (e.g. MP2615CGQ–Z).
TOP MARKING
BMR: Product code of MP2615CGQ
Y: Year code
LLLL: Lot number
PACKAGE REFERENCE
PGND
BST
TMR
NTC
ACOK
TOP VIEW
16
15
14
13
12
VIN
2
10
CSP
VCC
3
9
BATT
CELL
4
5
6
7
8
AGND
CHGOK
N/C
11
EN
1
SEL
SW
QFN-16 (3mmx3mm)
MP2615C Rev. 1.1
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
PIN FUNCTIONS
Pin #
Name
1
2
SW
VIN
3
VCC
4
CELL
5
SEL
6
EN
7
N/C
8
9
10
AGND
BATT
CSP
11
12
13
14
15
16
Description
Switch output.
Power supply voltage.
Coarse regulator output. Internally generated 4.5V. Bypass VCC with a 1µF capacitor to
AGND. VCC can be used as a low-side switch driver and a pull-up bias voltage NTC
resistor divider. Do not connect any external load to VCC.
Command input for the number of Li-ion cells. Connect this pin to VCC for single-cell
applications. Float the CELL pin or short it to AGND for dual-cell applications.
Input pin for setting terminal battery voltage. If SEL is pulled low or floating, VBATT is
4.2V/cell. If SEL is pulled high, VBATT is 4.1V/cell.
On/off control input. This pin is pulled to GND with a 1MΩ internal resistor. It is
recommended to connect a 100kΩ resistor in series with the EN pin.
No connection. Leave this pin floating.
Analog ground.
Positive battery terminal.
Battery current-sense positive input. Connect a resistor (RS1) between CSP and BATT.
Charging completion indicator. When this pin goes logic low, the device is charging. The
CHGOK pin becomes an open drain once the charge is completed or suspended.
Valid input supply indicator. A logic low on this pin indicates the presence of a valid input
ACOK power supply.
Thermistor input. Connect a resistor from this pin to the VCC pin. Connect the thermistor
NTC
from this pin to ground.
Internal safety timer control. Connect a capacitor from this node to AGND to set the
TMR
timer. Disable the timer by connecting this pin directly to AGND.
Bootstrap pin. Use a capacitor to drive the power switch’s gate above the supply voltage.
BST
The capacitor should be connected between the SW and BST pins to form a floating supply
across the power switch driver.
PGND Power ground.
MP2615C Rev. 1.1
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
θJA
θJC
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
VSW ................................................-0.3V to +23V
VIN, VACOK, VCHGOK..........................-0.3V to +23V
VBATT, VCSP………………………….-0.3V to +12V
VBST ...................................................... VSW + 6V
All other pins ...................................-0.3V to +6V
Junction temperature ................................150°C
Lead temperature......................................260°C
Continuous power dissipation (TA = 25°C) (2)
............................................................. 2.5W
Operating temperature ............... -40°C to +85°C
QFN-16 (3mmx3mm) .............. 50 ...... 12... °C/W
ESD Ratings
Charged device model (CDM)..................1250V
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-toambient thermal resistance, θJA, and the ambient
temperature, TA. The maximum allowable continuous power
dissipation at any ambient temperature is calculated by P D
(MAX) = (TJ (MAX) - TA) / θJA. Exceeding the maximum
allowable power dissipation can cause excessive die
temperature, and the regulator may go into thermal shutdown.
Internal thermal shutdown circuitry protects the device from
permanent damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions (3)
VIN…………………………………… 4.75V to 18V
VBATT ................................................... 2V to 8.4V
Operating junction temp (TJ) ...... -40°C to +85°C
MP2615C Rev. 1.1
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6/15/2023
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS
VIN = 12V, VCELL = 0V, VSEL = 0V, C1 = 22µF, C2 = 22µF, TA = 25°C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
Max
Units
VCELL = 4V
VCELL = 0V
4.5
8.75
5
12
18
18
V
3.55
3.75
3.95
V
Input Voltage and Current
Input voltage
Under-voltage lockout rising
threshold
Under-voltage lockout
threshold hysteresis
Supply current
Power MOSFET
High-side switch on
resistance
Low-side switch on
resistance
VIN
VUVLO
225
ISHDN
EN = 4V, shutdown current
0.27
IQ
EN = 0V, quiescent current
1.1
110
mΩ
RL_DS(ON)
110
mΩ
EN = 4V, VSW = 0V
Frequency and Time Parameter
Switching frequency
fSW
Foldback frequency
Minimum off time (5)
tOFF
Charging Parameter
VBATT = 7.5V
VBATT = 0V
VBATT = 9V
VBATT_FULL
Battery over-voltage
threshold
VBOVP
Recharge threshold at VBATT
VRECH
VSEL = 0V
VSEL = 4V
VCELL = 0V, VSEL = 0V
VCELL = 0V, VSEL = 4V
VCELL = 4V, VSEL = 0V
VCELL = 4V, VSEL = 4V
VSEL = 0V
VSEL = 4V
0
4.168
4.069
8.34
8.14
4.17
4.07
4.2
4.1
8.71
8.51
4.36
4.26
4.0
3.9
VTC
VSEL = 0V
VSEL = 4V
Peak current limit
ICC
ITC
Constant current charge
Trickle
RS1 = 25mΩ
IBF
VIN - VBATT
μA
kHz
kHz
ns
4.231
4.131
9.08
8.88
4.54
4.44
150
V/cell
mV/cell
3
2.91
225
Trickle charge hysteresis
CC current
Trickle charge current
Termination current
threshold
VIN minimum headroom
(reverse blocking)
1
760
160
200
Recharge hysteresis
Trickle-charge voltage
threshold
mA
RH_DS(ON) Measured from VIN to SW
Switch leakage
Terminal battery voltage
mV
V/cell
mV/Cell
3.2
A
1.9
5%
2.2
2.1
10%
2.3
15%
A
ICC
5%
10%
15%
ICC
300
MP2615C Rev. 1.1
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6/15/2023
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mV
5
MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, VCELL = 0V, VSEL = 0V, C1 = 22µF, C2 = 22µF, TA = 25°C, unless otherwise noted.
Parameter
Maximum current-sense
voltage (CSP to BATT)
Symbol
CSP, BATT current
ICSP, IBATT
ACOK/CHGOK open-drain
sink current
VCC Regulator Output
VCC output voltage
VCC load regulation
EN Control
Condition
VSENSE
Typ
Max
Units
47.5
52.5
57.5
mV
3
µA
Charging disabled
VDRAIN = 0.3V
VCC
∆VCC
Min
5
4.2
mA
4.5
ILOAD = 0 to 10mA
EN input low voltage
Logic
CELL input low voltage
CELL input high voltage
SEL input low voltage
SEL input high voltage
Timer Protection
Trickle charge time
CC/CV charge time
NTC Protection
NTC cold temp rising
threshold
NTC cold temp rising
threshold hysteresis
NTC hot temp falling
threshold
NTC hot temp falling
threshold hysteresis
Thermal Protection
Thermal shutdown (5)
Thermal shutdown
hysteresis (5)
V
mV
0.4
V
1.9
EN input high voltage
EN input current
4.75
10
IEN
EN = 4V
4
EN = 0V
0.2
VL
VH
VL
VH
1.8
0.4
1.8
30
CTMR = 0.47μF
73.3
74.6
RNTC = NCP18X103, 0°C
2
28
VHOT
V
V
V
V
min
165
72
VCOLD
μA
0.4
tTRICKLE_TMR CTMR = 0.47μF
tTOTAL_TMR
V
29.3
30.6
% of
VCC
RNTC = NCP18X103, 50°C
2
TSHDN
150
°C
20
°C
Reverse Leakage Blocking
Battery reverse leakage
current
ILEAKAGE
VCELL = 0V
VCELL = 4V
3
0.5
µA
µA
Notes:
5) Guaranteed by design.
MP2615C Rev. 1.1
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, C1 = C2 = 22μF, SEL = float/high, CELL = float/high, RS1 = 25mΩ, unless otherwise
noted.
Battery-Full Voltage vs.
Battery-Full Voltage vs. Temperature
Temperature
2-cell
1-cell
8.45
BATTERY-FULL VOLTAGE (V)
BATTERY-FULL VOLTAGE (V)
4.22
4.2
4.18
4.16
VBATT_FULL=4.1V
4.14
VBATT_FULL=4.2V
4.12
4.1
4.08
4.06
-50
0
50
100
8.4
8.35
8.3
VBATT_FULL=8.2V
8.25
VBATT_FULL=8.4V
8.2
8.15
8.1
-50
150
50
100
150
TEMPERATURE (°C)
TEMPERATURE (°C)
Constant Charge Current vs.
Temperature
Trickle Charge Current vs.
Temperature
RS1 = 25mΩ
RS1 = 25mΩ
2.19
TRICKLE CHARGE CURRENT
(mA)
250
2.17
CONSTANT CHARGE
CURRENT (A)
0
240
2.15
230
2.13
2.11
220
2.09
210
2.07
200
2.05
-50
0
50
100
-50
150
0
50
100
150
TEMPERATURE (°C)
TEMPERATURE (°C)
Charge-Full Current vs.
Temperature
VCC Output Voltage vs. Temperature
4.55
VCC OUTPUT VOLTAGE (V)
CHARGE-FULL CURRENT (mA)
RS1 = 25mΩ
250
240
230
220
210
200
4.5
4.45
4.4
4.35
4.3
-50
0
50
100
TEMPERATURE (°C)
150
-50
0
50
100
TEMPERATURE (°C)
MP2615C Rev. 1.1
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7
MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, C1 = C2 = 22μF, SEL = float/high, CELL = float/high, RS1 = 25mΩ, unless otherwise
noted.
Auto-Recharge Threshold Voltage
vs. Temperature
Auto-Recharge Threshold Voltage vs.
Temperature
2-cell
4
8
3.98
7.95
AUTO-RECHARGE
THRESHOLD (V)
AUTO-RECHARGE
THRESHOLD (V)
1-cell
3.96
3.94
7.9
VBATT_FULL=8.2V
7.85
3.92
VBATT_FULL=4.1V
3.9
VBATT_FULL=4.2V
VBATT_FULL=8.4V
7.8
7.75
3.88
7.7
3.86
3.84
7.65
-50
0
50
100
TEMPERATURE (°C)
150
-50
0
50
100
150
TEMPERATURE (°C)
MP2615C Rev. 1.1
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V/9V, C1 = C2 = 22µF, SEL = float/high, CELL = float/high, L = 6.8µH, RS1 = 25mΩ, battery
simulator, TA = 25°C, unless otherwise noted.
Battery Charge Curve
Auto-Recharge
VIN = 5V, 1-cell, VBATTREG = 4.2V
VIN = 5V, 1-cell, VBATTREG = 4.2V
CH1: VIN
CH1: VIN
CH2: VBATT
CH2: VBATT
CH4: IBATT
CH4: IBATT
CH3: VSW
CH3: VSW
Trickle Charge Steady State
Trickle Charge Steady State
VIN = 5V, 1-cell, VBATT = 1.9V
VIN = 9V, 2-cell, VBATT = 5.2V
CH2: VBATT
CH1: VIN
CH1: VIN
CH2: VBATT
CH4: IL
CH4: IL
CH3: VSW
CH3: VSW
CC Charge Steady State
CC Charge Steady State (COT)
VIN = 5V, 1-cell, VBATT = 3.6V
VIN = 5V, 1-cell, VBATT = 4V
CH1: VIN
CH1: VIN
CH2: VBATT
CH2: VBATT
CH4: IL
CH4: IL
CH3: VSW
CH3: VSW
MP2615C Rev. 1.1
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6/15/2023
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V/9V, C1 = C2 = 22µF, SEL = float/high, CELL = float/high, L = 6.8µH, RS1 = 25mΩ, battery
simulator, TA = 25°C, unless otherwise noted.
CC Charge Steady State
CC Charge Steady State (COT)
VIN = 9V, 2-cell, VBATT = 6.5V
VIN = 9V, 2-cell, VBATT = 7.5V
CH1: VIN
CH1: VIN
CH2: VBATT
CH2: VBATT
CH4: IL
CH4: IL
CH3: VSW
CH3: VSW
CV Charge Steady State
CV Charge Steady State
VIN = 5V, 1-cell, VBATT = 4.17V
VIN = 9V, 2-cell, VBATT = 8.35V
CH1: VIN
CH1: VIN
CH2: VBATT
CH2: VBATT
CH4: IL
CH4: IL
CH3: VSW
CH3: VSW
Start-Up, CC Charge Mode
Shutdown, CC Charge Mode
VIN = 9V, 2-cell, VBATT = 7V
VIN = 9V, 2-cell, VBATT = 7V
CH2: VBATT
CH2: VBATT
CH1: VIN
CH1: VIN
CH4: IBATT
CH4: IBATT
CH3: VSW
CH3: VSW
MP2615C Rev. 1.1
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6/15/2023
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V/9V, C1 = C2 = 22µF, SEL = float/high, CELL = float/high, L = 6.8µH, RS1 = 25mΩ, battery
simulator, TA = 25°C, unless otherwise noted.
VIN Hot Insertion, CC Charge Mode
VIN Removal, CC Charge Mode
VIN = 9V, 2-cell, VBATT = 7V
VIN = 9V, 2-cell, VBATT = 7V
CH2: VBATT
CH1: VIN
CH4: IBATT
CH1: VIN
CH4: IBATT
CH2: VBATT
CH3: VSW
CH3: VSW
EN On/Off
NTC Fault Control
VIN = 5V, 1-cell, VBATT = 3.6V
VIN = 9V, 2-cell, VBATT = 7V
CH1: VEN
CH1: VNTC
CH2: VBATT
CH4: IBATT
CH4: IBATT
CH2: VBATT
CH3: VSW
CH3: VSW
Timeout
Charge-Full Indication
VIN = 9V, 2-cell, VBATT = 7V, ICC = 2A,
CTMR = 470pF
VIN = 5V, 1-cell, VBATT = 3.6V
CH1: VIN
CH1: VTMR
CH4: IBATT
CH2: VBATT
CH4: IBATT
CH3: VSW
CH2:
VCHGOK
CH3: VACOK
MP2615C Rev. 1.1
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
FUNCTIONAL BLOCK DIAGRAM
VIN
Current Sense
IHS
EN
PRE_REGS
A1
BST
OSC
Regulator
CTRL
VREF
5-Bit Trim
M1
Current Limit
Comparator
S
Q
Drive
R
R
M2
SW
LDO
COMP
VCC
PWM
Comparator
Charge
Current Sense
NTC
FB
COMPV
GMI
GMV
Cells
COMPI
1.23V
L
M3
BATT
A2
0.123V
or 1.23V
CSP
BATT
RS1
1-Cell
or 2Cell
Battery
OVP
CTRL
ICHG
TMR
SEL
Timer
TC/CC
Charge
Comparator
OVP
Comparator
OVP
1.23V
VIN
ACOK
Comparator
Charge Control
Logic
Recharge
Comparator
BF
Comparator
VBATT + 0.2V
ACOK
CELLS
FB
0.879V
FB
1.171V
ICHG
0.123V
CHGOK
AGND
PGND
Figure 1: Functional Block Diagram
MP2615C Rev. 1.1
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
OPERATION
The MP2615C is a peak current mode control
switching charger for single-cell or dual-cell Li-ion
and Li-polymer batteries. The MP2615C
integrates both the high-side and low-side
MOSFETs of the synchronous buck converter to
provide high efficiency and reduce PCB size.
Charge Cycle (Mode Change: TC to CC to CV)
The MP2615C regulates the charge current (ICHG)
and battery voltage (VBATT) using two control
loops to achieve highly accurate constant current
(CC) charge and constant voltage (CV) charge.
If VBATT is below VTC, the MP2615C remains in
trickle charge mode, and the output of the charge
current loop (COMPI) dominates the control (see
Figure 2). The battery is charged by a trickle
charge current (ITC) until the battery voltage
reaches VTC. If the charger remains in trickle
charge mode until the trickle charge timer is
triggered, charging is terminated.
The MP2615C enters CC charge mode once the
battery voltage exceeds VTC. In this mode, the
charge current increases from ITC to ICC to fast
charge the battery.
If the battery voltage exceeds the battery-full
voltage (VBATT_FULL), the charger enters CV mode.
In CV mode, the battery voltage is regulated at
VBATT_FULL, and the charge current falls naturally
due to the existing equivalent internal resistance
of the battery. Figure 4 shows an operation
flowchart.
CV Charge
Threshold
AutoRecharge
Threshold
CC Charge
Current
ICHG
VBATT
CC Charge
Threshold
IBF
Trickle
Charge
CC
Charge
CV
Charge
Charge
Full
TC Charge
Current
AutoRecharge
Figure 2: Li-Ion Battery Charge Profile
Charge Full Termination and Auto-Recharge
If the charge current drops below the
termination threshold (IBF) during the CV charge
phase, the charger stops charging and the
CHGOK pin becomes an open drain. The timer
resets and turns off. Once the battery voltage
drops below the recharge threshold (VRECH)
(4.0V/cell while the SEL pin is connected to
AGND), recharging automatically begins and
the timer restarts a new charge cycle.
Constant-Off-Time (COT) Charge Mode
The MP2615C uses the floating ground method
to drive the buck converter’s high-side MOSFET
(HS-FET). While the HS-FET is off, the BST
capacitor is recharged, and the voltage across
the capacitor is used as the HS-FET’s gate
driver. Thus a minimum off time of 200ns is
required to maintain sufficient voltage at the
BST capacitor.
When the 200ns minimum off time is achieved
due to a large duty cycle, the MP2615C enters
constant-off-time (COT) charge mode. In this
mode, the switching frequency is slightly
reduced to achieve a 99% duty cycle.
Charge Status Indication
The MP2615C has two open-drain status
outputs: the CHGOK and ACOK pins. The
ACOK pin goes low when the input voltage
exceeds the battery voltage and the undervoltage lockout (UVLO) threshold by 300mV.
The CHGOK pin indicates the status of the
charge cycle.
Table 1 lists the operation for both CHGOK and
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
The trickle mode charge time can be estimated
with Equation (2):
ACOK according to the charger status.
Table 1: Charging Status Indication
ACOK
Low
Low
High
impedance
CHGOK
Low
t TRICKLE_TMR (minutes) = 62.8 CTMR (F)
Charger Status
High
impedance
Charging
• End of charging
• NTC fault has
occurred
• Timer ran out
High
impedance
•
•
•
•
If CTMR is 0.47µF, the trickle charge time is
about 30 minutes. The CC/CV mode charge
time can be calculated with Equation (3):
t TOTAL_TMR (hours) = 6.28 CTMR (F)
EN disabled
Thermal shutdown
VIN absent
VIN - VBATT < 0.3V
(1)
This timer limits the maximum trickle charge
time to 8192 internal oscillating periods. If the
charger remains in trickle charge mode for
longer than the maximum oscillating periods,
charging is terminated and CHGOK becomes
an open drain to indicate a timeout fault. If the
charge cycle successfully completes trickle
charge within the allowed time limit, it enters CC
charge mode and the timer continues to count
the oscillating periods. When the battery is fully
charged, the timer turns off and clears the
counter, waiting for the auto-recharge to restart.
If the charge time during CC/CV mode exceeds
49152 oscillating periods, and the battery-full
condition has not been met, charging is
terminated and a timeout fault is indicated by
floating the CHGOK pin. The charger can exit
the timeout fault state (and restart the on-chip
safety timer) when one of the following
conditions occurs:
•
•
•
(3)
In this case, if CTMR is 0.47µF, the CC/CV
charge time is 2.95 hours.
Safety Timer Operation
The MP2615C has an internal safety timer to
terminate charging during timeout. The
capacitor (CTMR) connected between the TMR
pin and GND is used to set the internal
oscillator period, calculated with Equation (1):
tP (seconds) = 0.46 CTMR (F)
(2)
The battery voltage falls below the autorecharge threshold (VRECH)
A power-on reset (POR) event occurs
The EN pin is toggled
The timer can be disabled by pulling the TMR
pin to AGND.
Negative
Thermal
Coefficient
(NTC)
Thermistor
The NTC pin allows the MP2615C to sense the
battery temperature using the negative thermal
coefficient (NTC) resistor in the battery pack.
This ensures a safe operating environment for
the battery. A resistor with an appropriate value
should be connected from the VCC pin to the
NTC pin, and the thermistor should be
connected from the NTC pin to AGND. The
voltage on the NTC pin is determined by the
resistor divider, which has a divide ratio that
depends on the battery temperature. When the
voltage at the NTC pin falls out of the NTC
window range, charging pauses until the battery
temperature returns to within the normal
operating range.
As a result, the MP2615C stops charging and
reports this condition to the status pins.
Charging automatically resumes after the
temperature returns to within a safe range.
Short-Circuit Protection
The MP2615C has an internal comparator to
check for battery short-circuit conditions. If
VBATT falls below 2V, the device detects a
battery short status, and the cycle-by-cycle
peak current limit falls to about 2.2A to limit the
current spike during the battery short transition.
The switching frequency also folds back to
minimize the power loss.
Thermal Shutdown Protection
To prevent the chip from overheating while it
charges, the MP2615C monitors the junction
temperature (TJ) of the die. If TJ reaches the
thermal shutdown threshold (TSHTDWN) of 150°C,
the charger converter turns off. Once TJ falls
below 130°C, charging resumes.
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
INPUT POWER START-UP TIMING FLOW
Figure 3: Input Power Start-Up Timing Diagram
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
OPERATION FLOWCHART
Figure 4: Operation Flowchart
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
APPLICATION INFORMATION
COMPONENT SELECTION
Charge Current Setting
The MP2615C’s constant charge current (ICC)
can be set via the sense resistor (RS1) (see the
Typical Application Circuit section on page 18).
Calculate the constant current (CC) charge with
Equation (4):
ICC =
52.5mV
(A)
RS1(m)
(4)
If VBATT = 6V and fSW = 760kHz, the calculated
inductance is 6.6µH. The inductor saturation
current must exceed 2.6A and have some
tolerance. To optimize efficiency, choose an
inductor with a DC resistance below 50mΩ.
NTC Resistor Divider Selection
Figure 5 shows how an internal resistor divider
sets the cold temperature threshold and hot
temperature threshold at 73.3% of VCC and
31.1% of VCC, respectively.
If ICC is 2.1A, choose RS1 to be 25mΩ.
The trickle charge current
estimated with Equation (5):
(ITC)
ITC = 0.10 ICC
can
be
(5)
Selecting the Inductor
To select the optimal inductor, a tradeoff should
be made between cost, size, and efficiency. An
inductor with a lower-value inductance has the
benefit of a smaller size, but also has higher
ripple currents, magnetic hysteretic losses, and
output capacitance. Conversely, a higher-value
inductor lowers the ripple current and allows for
the use of smaller output filter capacitors, but it
also results in higher inductor DC resistance
(DCR) loss.
Based on practical experience, the inductor
ripple current should not exceed 30% of the
maximum charge current under the worst-case
conditions. For the MP2615C, with a typical
12V input voltage to charge a 2-cell battery, the
maximum inductor current ripple occurs at the
corner point between trickle charge and CC
charge (VBATT = 6V). The inductance can be
calculated with Equation (6):
L=
VIN -VBATT VBATT
ΔIL_MAX VIN fSW
(6)
The thermistor (NCP18XH103) in Figure 5 has
the following electrical characteristics:
•
•
At 0°C, RNTC_COLD = 27.445kΩ
At 50°C, RNTC_HOT = 4.1601kΩ
For a given NTC thermistor, select values for
RT1 and RT2 to set the NTC window. Assuming
that the NTC window is between 0°C and 50°C,
the cold and hot thresholds can be calculated
with Equation (8) and Equation (9), respectively:
RT2 //RNTC_COLD
RT1 + RT2 //RNTC_COLD
RT2 //RNTC_HOT
RT1 + RT2 //RNTC_HOT
Where VIN is the input voltage, VBATT is the CC
charge threshold, and fSW is the switching
frequency.
∆IL_MAX is the maximum inductor ripple
current, which is usually 30% of the CC charge
current, calculated with Equation (7):
ΔIL_MAX = 0.30 ICC
Figure 5: NTC Functional Block
(7)
= VCOLD = 73.3%
(8)
= VHOT = 31.1%
(9)
The required battery temperature range can be
paired with Equation (8) and Equation (9) to
calculate RT1 and RT2.
Selecting the Input Capacitor
The input capacitors (C1) from the typical
application circuit absorb the maximum ripple
current from the buck converter, which can be
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
estimated with Equation (10):
IRMS_MAX = ICC
VTC (VIN_MAX − VTC )
VIN_MAX
1CO =
(10)
8 fsW 2 L RO_MAX
= 21.3F
(12)
In this case, choose a 22µF ceramic capacitor.
If ICC = 2A, VTC = 6V, and VIN_MAX = 18V, the
maximum ripple current is 1A. Select the input
capacitors so that the temperature rise due to
the ripple current does not exceed 10°C. It is
recommended to use ceramic capacitors with
X5R or X7R dielectrics because of their low
ESR and small temperature coefficients. For
most applications, use a 22µF capacitor.
PCB Layout Guidelines
Proper PCB layout is important to meet
specified noise, efficiency and stability
requirements. For the best results, refer to
Figure 6 and follow the guidelines below:
1. Route the power stage adjacent to the
grounds.
Selecting the Output Capacitor
The output capacitor (C2) is in parallel with the
battery. C2 absorbs the high-frequency
switching ripple current and smooths the output
voltage. Its impedance must be below the
battery’s to ensure it absorbs the ripple current.
Use a ceramic capacitor because it has a lower
ESR and smaller size. The output voltage ripple
can be calculated with Equation (11):
VO
VO
VIN
ΔRO =
=
VO
8 CO fSW 2 L
VTC
VIN_MAX
2. Aim to minimize the high-side switching
node (SW, inductor) trace lengths in the
high-current paths and the current-sense
resistor trace.
3. Keep the switching node short, and route it
away from the feedback network.
4. Connect the charge current-sense resistor to
CSP (pin 10) and BATT (pin 9). Minimize the
length and area of this circuit loop.
1-
5. Place the input capacitor as close as
possible to the VIN and PGND pins.
(11)
6. Place the output inductor as close as
possible to the IC, and connect the output
capacitor between the inductor and PGND
of the IC. This minimizes the current path
loop area from the SW pin through the LC
filter and back to the PGND pin.
To guarantee u0.5% battery-full voltage
accuracy, the maximum output voltage ripple
should not exceed 0.5% (e.g. 0.1%). The
maximum output voltage ripple occurs at the
minimum battery voltage of the CC charge and
the maximum input voltage.
7. Connect AGND and PGND at a single point.
If VIN_MAX = 18V, VCC_MIN = VTC = 6V, L = 6.8µH,
fSW = 760kHz, and ∆RO_MAX = 0.1%, the output
capacitor can be calculated with Equation (12):
PGND
BST
TMR
NTC
ACOK
BATT
GND
GND
VIN
CHGOK
CSP
BATT
CELL
SEL
EN
NC
AGND
SW
VIN
VCC
Figure 6: Recommended PCB Layout
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
TYPICAL APPLICATION CIRCUIT
L
VIN
1kΩ
6.8µH
SW
VIN
R2
C4
BST
CHGOK
RS1
25mΩ
100nF
1kΩ R1
CSP
ACOK
R3
C1
22µF
RNTC
C3
1µF
VCC
BATT
NTC
TMR
EN
SEL
10kΩ
10kΩ
C2
MP2615C
22µF
2-Cell
Battery
R4 100kΩ
ON OFF
AGND
CTMR
1µF
PGND
CELL
Figure 7: Typical Application Circuit to Charge a 2-Cell Battery with 12V VIN
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
PACKAGEPACKAGE
INFORMATION
OUTLINE DRAWING FOR 16L FCQFN (3X3MM)
MF-PO-D-0157
revision 0.0
QFN-16 (3mmx3mm)
PIN 1 ID
MARKING
PIN 1 ID
0.10x45° TYP.
PIN 1 ID
INDEX AREA
BOTTOM VIEW
TOP VIEW
SIDE VIEW
NOTE:
0.10x45°
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE
MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10
MILLIMETERS MAX.
4) JEDEC REFERENCE IS MO-220.
5) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
CARRIER INFORMATION
Pin1
1
1
ABCD
1
1
ABCD
ABCD
ABCD
Feed Direction
Part Number
Package
Description
Quantity/
Reel
Quantity/
Tube
Quantity/
Tray
Reel
Diameter
Carrier
Tape
Width
Carrier
Tape
Pitch
MP2615CGQ–Z
QFN-16
(3mmx3mm)
5000
N/A
N/A
13in
12mm
8mm
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MP2615C – 2.1A, 1-CELL OR 2-CELL LI-ION BATTERY CHARGER
REVISION HISTORY
Revision #
1.0
Revision Date
9/11/2020
1.1
6/15/2023
Description
Initial Release
Updated the maximum current-sense voltage (CSP to
BATT) to 47.5 (min), 52.5 (typ), 57.5 (max); updated the
EN input high voltage to 1.9 (min); updated the NTC hot
temp falling threshold to 28 (min), 29.3 (typ), 30.6 (max)
Pages Updated
6
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.
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