MP2759
36V Switching Charger with
Power Path Management
for 1-Cell to 6-Cell Batteries
DESCRIPTION
FEATURES
The MP2759 is a highly integrated switching
charger designed for applications with 1-cell to
6-cell series Li-ion or Li-polymer battery packs.
The device supports several battery chemistry
types with different battery regulation voltages.
The device operates from a maximum 36V DC
input voltage and hold-off up to 45V. When an
input power supply is present, the MP2759
charges the battery with four phases: trickle
charge, pre-charge, constant current (CC)
charge, and constant voltage (CV) charge.
The MP2759 offers input current limiting and a
minimum input voltage limit function. If the input
current reaches the input current limit, or the
input voltage drops to the minimum input
voltage limit, the MP2759 automatically reduces
the charge current to limit the input power.
To guarantee safe operation, the MP2759
includes robust protection features such as
battery
over-voltage
protection,
battery
temperature sensing and protection, thermal
shutdown, and a charging safety timer.
The MP2759 is available in a small QFN-19
(3mmx3mm) package.
Up to 36V Operating Input Voltage
45V Max Sustainable Voltage when Not
Switching
Up to 3A Charge Current
1 Cell to 6 Cells in Series with 3.6V, 4.0V,
4.1V, 4.15V, 4.2V, 4.35V, or 4.4V Battery
Regulation Voltage for Each Cell
Input Current Limit Regulation
Input Minimum Voltage Regulation
Support OR Selection Power Path
Management
0.5% Battery Regulation Voltage Accuracy
Integrated Reverse Blocking FET
Internal Loop Compensation
Charge Operation Indicator
Input Status Indicator
Battery Over-Voltage Protection
Charging Safety Timer
Battery Thermal Monitoring and Protection
with JEITA Profile
Available in a QFN-19 (3mmx3mm)
Package
Safety-Related Certification
IEC 62368-1 CB Certification
APPLICATIONS
Industrial Medical Equipment
Power Tools
Robot and Portable Vacuum Cleaners
Wireless Speakers
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.
MP2759 Rev. 1.0
11/30/2020
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1
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
TYPICAL APPLICATION
PMID
Q1
BST
Q2
Input
SW
IN
1S-6S
Battery
Pack
CSP
Q3
BATT
ACOK
VLIM
MP2759
ILIM
CELL
VB
VCC
VCC
STAT
NTC
ISET
PGND
RNTC
CELL Pin Connection
Number of Battery Cells
AGND
1-cell series
30kΩ to 40kΩ
2-cell series
60kΩ to 70kΩ
3-cell series
100kΩ to 110kΩ
4-cell series
160kΩ to 170kΩ
5-cell series
Pull up to VCC
6-cell series
VB Pin Connection
Battery Regulation Voltage
AGND
3.6V
30kΩ to 40kΩ
100kΩ to 110kΩ
4.0V
4.15V or 4.1V
(OTP-configurable)
4.2V
160kΩ to 170kΩ
4.35V
Pull up to VCC
4.4V
60kΩ to 70kΩ
MP2759 Rev. 1.0
11/30/2020
AGND
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2
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
ORDERING INFORMATION
Part Number*
MP2759GQ-xxxx**
EV2759-Q-00A
Package
QFN-19 (3mmx3mm)
Evaluation Kit
Top Marking
See Below
N/A
MSL Rating
1
* For Tape & Reel, add suffix –Z (e.g. MP2759GQ-xxxx–Z).
**“-xxxx” is the register setting option. The factory default is “-0000.” This content can be viewed in the
OTP register map. Contact an MPS FAE to obtain an “-xxxx” value.
TOP MARKING
BME: Product code of MP2759GQ
Y: Year code
LLLL: Lot number
PACKAGE REFERENCE
TOP VIEW
VLIM ISET VCC AGND CSP
19
IN
1
PMID
2
18
17
16
15
BATT
14
13 ILIM
12 NTC
11 VB
SW
3
10 CELL
4
5
6
7
8
9
BST PGND PGND PGND STAT ACOK
QFN-19 (3mmx3mm)
MP2759 Rev. 1.0
11/30/2020
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3
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
PIN FUNCTIONS
Pin #
Name
Type
1
IN
Power
2
PMID
Power
3
SW
Power
4
BST
Power
5, 6, 7
PGND
Power
8
9
--------------
STAT
----------------
O
Description
Power input. Connect a 1μF capacitor from IN to PGND. See Application Section
for capacitor and voltage clamping recommendation.
Decoupling capacitor of the power stage. Bypass PMID with a 2.2µF ceramic
capacitor from PMID to PGND. Place the capacitor as close to the IC as possible
with the shortest route for both the PMID and PGND current path. A 2A/40V
Schottky diode must be placed between the IN pin and PMID pin.
Switching node. Connect SW to the inductor.
Bootstrap pin. Connect a 100nF bootstrap capacitor between the BST and SW
pins to form a floating supply to drive the high-side MOSFET (HS-FET) above the
supply voltage.
Power ground.
Status indication. This pin indicates the charging operation status and fault status
with an open-drain output (see Table 3 on page 15).
O
Input voltage valid indication. This pin is an open-drain output, active low.
10
11
ACOK
CELL
VB
I
I
12
NTC
I
13
ILIM
I
14
BATT
I
15
16
CSP
AGND
I
Power
17
VCC
I
18
ISET
I
19
VLIM
I
Battery cell number selection.
Battery regulation voltage setting.
Temperature-sense input. Connect the NTC pin to a negative temperature
coefficient (NTC) thermistor. A JEITA profile is supported with configurable
thresholds.
Input current limit setting pin. Connect a resistor from ILIM to AGND.
Battery positive sensing pin. Place a minimum 10μF capacitor from BATT to
PGND. See Application Section for capacitor and voltage clamping
recommendation.
Battery current-sense positive input.
Analog ground.
Internal circuit power supply. Bypass VCC to AGND with a 1µF ceramic
capacitor.
Charging current setting pin. Connect a resistor from ISET to AGND.
Input voltage limit setting pin. Connect to a resistor divider from VLIM to IN and
AGND. This pin can be pulled low to disable charging.
MP2759 Rev. 1.0
11/30/2020
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4
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
ABSOLUTE MAXIMUM RATINGS (1)
---------------
IN, PMID, ACOK, BATT, CSP
to PGND .......................................-0.3V to +45V
SW to PGND ..........-0.3V (-2V for 20ns) to +45V
BST to SW…… .......................SW to SW + 5.5V
CSP to BATT ...............................-0.6V to +0.6V
All other pins to AGND .................-0.3V to +5.5V
Continuous power dissipation (TA = 25°C) (2)
................................................................... 2.5W
Junction temperature ................................150°C
Lead temperature (solder) ........................260°C
Storage temperature ................ -65°C to +150°C
ESD Ratings
Human body model (HBM) (3) ................... 2000V
Charge device mode (CDM) (4)………….... 750V
Thermal Resistance (6)
θJA
θJC
QFN-19 (3mmx3mm) .............. 50 ...... 12.. °C/W.
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) Per ANSI/ESDA/JEDEC JS-001.
4) Per JESD22-C101.
5) The device is not guaranteed to function outside of its
operating conditions.
6) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions (5)
Supply voltage (VIN) ............................ 4V to 36V
IIN........................................................... Up to 3A
ICHG ........................................................ Up to 3A
VBATT ................................................. Up to 26.4V
Operating junction temp (TJ) .... -40°C to +125°C
MP2759 Rev. 1.0
11/30/2020
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5
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
ELECTRICAL CHARACTERISTICS
VIN = 24V, 4-cell, VBATT = 3.7V/cell, RSNS = 20mΩ, TA = -40°C to +125°C, unless otherwise noted.
Parameter
Input Power Characteristics
IN under-voltage lockout
(UVLO) threshold
IN UVLO threshold hysteresis
IN vs. BATT headroom
IN vs. BATT headroom
hysteresis
IN over-voltage lockout
(OVLO) threshold
Symbol
Condition
Min
Typ
Max
Units
VIN_UVLO
VIN falling
3.3
3.6
3.9
V
VHDRM
VIN rising
VIN rising
1.5
360
2
2.4
mV
V
VIN falling
VIN_OVLO
DC/DC Converter
Input shutdown current
IIN_SHDN
Input quiescent current
IIN_Q
Peak current limit for HS-FET
Switching frequency
VVCC
IVCC
RON_Q1
RON_Q2
RON_Q3
IHS_PK
fSW
VBATT_TC
Pre-charge to fast charge
threshold
VBATT_PRE
Minimum pre-charge current
Fast charge current
MP2759 Rev. 1.0
11/30/2020
VIN = 32V, VLIM = AGND
VIN = 32V, charging is enabled,
4-cell, charging terminated
ITC
IPRE
IPRE_MIN
ICC
VIN = 24V
TA = 25°C
TA = 25°C
TA = 25°C
Constant current charge mode,
TA = 25°C
Trickle charge or pre-charge,
TA = 25°C
fSW = 700kHz
fSW = 450kHz
TA = -20°C to +85°C
VB = 4.0V, 4.1V, 4.15V, 4.2V,
4.35V, or 4.4V
VB = 3.6V
IPRE = 10% of ICC,
TA = -20°C to +85°C
IPRE = 20% of ICC,
TA = -20°C to +85°C
TA = -20°C to +85°C
RISET = 96kΩ
RISET = 48kΩ
36
mV
37
1
1
4.8
30
4.5
V
V
600
IBATT_SHDN VBATT = 24V, VIN = PGND
Battery Charger
Trickle charge to pre-charge
threshold
Trickle charge current
Pre-charge current
35
VIN falling
IN OVLO threshold hysteresis
BATT leakage current in
shutdown mode
VCC LDO output voltage
VCC LDO output current limit
Blocking FET on resistance
HS-FET on resistance
LS-FET on resistance
VIN rising
400
μA
mA
5.5
10
μA
5
5.2
38
38
55
43
43
63
V
mA
mΩ
mΩ
mΩ
5.5
6.5
A
3.2
690
440
kHz
1.9
2.0
2.1
V/cell
70
100
130
mA
2.9
2.3
3
2.5
3.1
2.7
V/cell
V/cell
7
10
13
16
20
24
70
0.9
1.8
100
1
2
130
1.1
2.2
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%
mA
A
6
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
ELECTRICAL CHARACTERISTICS (continued)
VIN = 24V, 4-cell, VBATT = 3.7V/cell, RSNS = 20mΩ, TA = -40°C to +125°C, unless otherwise noted.
Parameter
Symbol
Battery charge voltage
regulation
Battery charge termination
current
VBATT_REG
ITERM
Condition
VB set to 4.2V, CELL set to 1S,
TA = 25°C
VB set to 4.2V, CELL set to 2S,
TA = 25°C
VB set to 4.2V, CELL set to 3S,
TA = 25°C
VB set to 4.2V, CELL set to 4S,
TA = 25°C
VB set to 4.2V, CELL set to 5S,
TA = 25°C
VB set to 4.2V, CELL set to 6S,
TA = 25°C
VB set to 3.6V, CELL set to 3S,
TA = 25°C
VB set to 4.0V, CELL set to 3S,
TA = 25°C
VB set to 4.1V, CELL set to 3S,
TA = 25°C
VB set to 4.15V, CELL set to 3S,
TA = 25°C
VB set to 4.35V, CELL set to 3S,
TA = 25°C
VB set to 4.4V, CELL set to 3S,
TA = 25°C
ITERM = 10% of ICC,
TA = -20°C to +85°C
ITERM = 20% of ICC,
TA = -20°C to +85°C
TA = -20°C to +85°C
Minimum termination current
ITERM_MIN
Charge termination deglitch
tTERM_DGL
time
Auto-recharge battery voltage
VRECH
Below VBATT_REG
threshold
Battery over-voltage
VBATT_OVP Compared with VBATT_REG, rising
protection threshold
Battery over-voltage
protection threshold
Compared with VBATT_OVP, falling
hysteresis
Input Voltage and Input Current Regulation
RILIM = 80kΩ
Input current limit
IIN_LIM
RILIM = 40kΩ
Minimum input voltage
VIN_MIN_REF
regulation reference
MP2759 Rev. 1.0
11/30/2020
Min
Typ
Max
4.18
4.20
4.22
8.36
8.40
8.44
12.54
12.60
12.66
16.72
16.80
16.88
20.90
21.00
21.11
25.07
25.20
25.33
10.75
10.80
10.85
11.94
12.00
12.06
12.24
12.30
12.36
12.39
12.45
12.51
12.98
13.05
13.12
13.13
13.20
13.27
7
10
13
16
20
24
60
100
145
Units
V
%
100
mA
ms
150
200
250
mV/cell
110
150
190
mV/cell
125
mV/cell
0.9
1.8
1
2
1.1
2.2
A
1.18
1.2
1.22
V
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7
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
ELECTRICAL CHARACTERISTICS (continued)
VIN = 24V, 4-cell, VBATT = 3.7V/cell, RSNS = 20mΩ, TA = -40°C to +125°C, unless otherwise noted.
Parameter
Thermal Protection
Thermal shutdown rising
threshold (7)
Symbol Condition
TJ_SHDN
Min
TJ rising
Thermal shutdown
hysteresis (7)
Battery Temperature Monitoring and Protection
VCOLD = 74% of VVCC
NTC cold temp rising
VCOLD
threshold
VCOLD = 70% of VVCC
NTC cold temp rising
As a percentage of VVCC
threshold hysteresis
NTC cool temp rising
threshold
VCOOL
NTC cool temp rising
threshold hysteresis
NTC warm temp falling
threshold
VWARM
----------------
STAT pin output voltage
------------------
ACOK pin output voltage
VLIM pin off voltage
VLIM pin off hysteresis
Timing Characteristic
Charge safety timer
°C
74
70
75
71
66
VCOOL = 60% of VVCC
59
60
61
VHOT = 23% of VVCC
VHOT = 25.9% of VVCC
1.4
31.5
32.5
33.5
28
29
30
%
1.4
22
23
24
24.9
25.9
26.9
As a percentage of VVCC
1.4
ISINK = 5mA
0.4
V
ISINK = 2mA
0.4
V
VVLIM_OFF VLIM falling
tTMR
20
65
As a percentage of VVCC
NTC hot temp falling
threshold hysteresis
Logic I/O Pin Characteristics
°C
64
VWARM = 32.5% of VVCC
Units
150
VCOOL = 65% of VVCC
VWARM = 29% of VVCC
VHOT
Max
1.4
As a percentage of VVCC
NTC warm temp falling
threshold hysteresis
NTC hot temp falling
threshold
73
69
Typ
tTMR = 20hrs
0.6
0.8
40
1.0
V
mV
18
20
22
hours
Notes:
7) Guaranteed by design.
MP2759 Rev. 1.0
11/30/2020
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8
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
TYPICAL PERFORMANCE CHARACTERISTICS
L = 10μH/35mΩ, CBATT = 10μF, RSNS = 20mΩ, unless otherwise noted.
Battery Leakage Current in Shutdown
Mode vs. Temperature
Battery Charge Voltage Regulation
vs. Temperature
BATT = 24V
VBATT_REG = 16.8V
50.0
20.00
VBATT_REG = 16.8V (V)
IBATT_SHDN (μA)
40.0
18.00
30.0
16.00
20.0
14.00
10.0
0.0
12.00
-50 -30 -10 10 30 50 70 90 110 130
TEMPERATURE (°C)
-50 -30 -10 10 30 50 70 90 110 130
TEMPERATURE (°C)
Charge Current vs. Temperature
Termination Current vs. Temperature
ICC = 2A
ICC = 2A
2300
ITERM (mA)
ICC = 2A (mA)
2200
2100
2000
1900
1800
250
240
230
220
210
200
190
180
170
160
150
-50 -30 -10 10 30 50 70 90 110 130
TEMPERATURE (°C)
-50 -30 -10 10
30
50
70
90 110 130
TEMPERATURE (°C)
Input Current Limit vs. Temperature
Minimum Input Voltage Reference vs.
Temperature
IIN_LIM = 2A
2300
1.300
VIN_MIN_REF (V)
IIN_LIM = 2A (mA)
2200
2100
2000
1900
1.250
1.200
1.150
1800
1700
1.100
-50 -30 -10 10 30 50 70 90 110 130
TEMPERATURE (°C)
MP2759 Rev. 1.0
11/30/2020
-50 -30 -10 10 30 50 70 90 110 130
TEMPERATURE (°C)
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9
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
L = 10μH/35mΩ, CBATT = 10μF, RSNS = 20mΩ, TA = 25°C, unless otherwise noted.
Battery Charge Curve
Efficiency vs. Charge Current
VIN = 24V, 3-cell, VBATT_REG = 4.2V, ICC = 3A,
IIN_LIM = 2A
fSW = 700kHz
100.0%
EFFICIENCY
98.0%
96.0%
CH2: VIN
94.0%
CH4: IBATT
VIN=16V,
VIN=16V,
VIN=24V,
VIN=30V,
92.0%
90.0%
VBATT=8.4V
VBATT=12.6V
VBATT=16.8V
VBATT=25.2V
CH1: VBATT
CH3: VSW
88.0%
0
1
2
3
ICC (A)
Trickle Charge Steady State
Pre-Charge Steady State
VIN = 24V, 4-cell, VBATT = 7V, ICC = 3A,
IIN_LIM = 2A
VIN = 24V, 4-cell, VBATT = 10V, ICC = 3A,
IIN_LIM = 2A
CH2: VIN
CH2: VIN
CH1: VBATT
CH1: VBATT
CH4: IL
CH4: IL
CH3: VSW
CH3: VSW
Constant Current Charge Steady
State
Constant Voltage Charge Steady
State
VIN = 24V, 4-cell, VBATT = 12V, ICC = 3A,
IIN_LIM = 2A
VIN = 24V, 4-cell, VBATT = 16.8V, ICC = 3A,
IIN_LIM = 2A
CH2: VIN
CH2: VIN
CH1: VBATT
CH1: VBATT
CH4: IL
CH4: IL
CH3: VSW
CH3: VSW
MP2759 Rev. 1.0
11/30/2020
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10
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
L = 10µH/35mΩ, CBATT = 10µF, RSNS = 20mΩ, TA = 25°C, unless otherwise noted.
Start-Up, Constant Current Charge
Mode
Shutdown, Constant Current Charge
Mode
VIN = 18V, 2-cell, VBATT = 8V, ICC = 2A,
IIN_LIM = 2A
VIN = 18V, 2-cell, VBATT = 8V, ICC = 2A,
IIN_LIM = 2A
CH2: VIN
CH2: VIN
CH4: IBATT
CH4: IBATT
CH1: VBATT
CH1: VBATT
CH3: VSW
CH3: VSW
Start-Up, Power Path Operation
Shutdown, Power Path Operation
VIN = 18V, 2-cell, VBATT = 8V, ICC = 2A,
IIN_LIM = 1A, ISYS = 0.9A
VIN = 18V, 2-cell, VBATT = 8V, ICC = 2A,
IIN_LIM = 1A, ISYS = 0.9A
CH2: VIN
CH2: VIN
CH1: VSYS
CH1: VSYS
CH4: IBATT
CH4: IBATT
CH3: VSW
CH3: VSW
Input Current Limit Loop Control
Input Voltage Limit Loop Control
VIN = 24V, 3-cell, VBATT = 10V, ICC = 3A,
IIN_LIM = 1A
VIN = 24V/1A, 3-cell, VBATT = 10V, ICC = 3A,
IIN_LIM = 2A, VIN_LIM = 15V
CH2: VIN
CH2: VIN
CH1: VBATT
CH1: VBATT
CH4: IL
CH4: IL
CH3: VSW
CH3: VSW
MP2759 Rev. 1.0
11/30/2020
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11
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
FUNCTIONAL BLOCK DIAGRAM
VIN
PMID
IN
IHS
Charge
Pump
LDO
VCC
Input
Current
Sense
AGND
NTC
VCC
Clock
S
RH
Driver
Q
SW
PWM On/Off
R
Q
ZCD
IIN_SNS
IBATT
NTC Fault
Battery Current
Sensing
Battery Voltage Loop
ILIM
IIN_REF
Setting
1S-6S
Battery
Pack
PGND
IHS
NTC
Function
Block
Comparator
Input Current Loop
RNTC
BST
CSP
BATT
EA
IIN_REF
EA
1.2V
VBATT_REF
EA
VLIM
Input Voltage Loop
VB
VBATT_REF
Setting
CELL
STAT
PWM On/Off
EA
0.8V
IBATT
Charge Current Loop
ACOK
Charge
Control Logic
Timer
Function
Block
ICHG_REF
Setting
ISET
NTC Fault
Figure 1: Functional Block Diagram
MP2759 Rev. 1.0
11/30/2020
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12
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
OPERATION
Introduction
The MP2759 is a highly integrated switching
charger designed for applications with 1-cell to
6-cell series Li-ion or Li-polymer batteries. The
device manages battery charging with various
series cell number selections and charge
regulation voltages.
Power Supply
The VCC pin is powered by the IN pin. VCC
generates a regulated 5V output with a
minimum 30mA current limit. The VCC voltage
(VVCC) powers the internal bias circuit and
power MOSFET driver. It can also be used for
external resistor logic pull up, or LED driver bias.
When the input source is absent and only a
battery is present, VCC has no output.
The IC exits sleep mode and is ready to start
the charging process once VVCC exceeds the
internal under-voltage lockout (UVLO) threshold.
Input Valid Indication
The IC checks the voltage of the input source
(VIN) before start-up. The input source has to
meet the following conditions:
VIN > VIN_UVLO
VIN > VBATT + VHDRM
---------------
The ACOK pin pulls low after VIN meets the
requirements above, which indicates that the
input power source is ready. After a 170ms
delay, the DC/DC converter is enabled.
Charge Cycle
The IC checks the battery voltage to provide
four charging phases: trickle charge, pre-charge,
constant current (CC) charge, and constant
voltage (CV) charge (see Figure 2). These
phases are described below:
Phase 1 (trickle charge): If the battery voltage is
below VBATT_TC (2V/cell), the IC charges the
battery with a trickle charge current of 100mA.
Phase 2 (pre-charge): When the battery voltage
exceeds VBATT_TC (2V/cell) but is below VBATT_PRE
(3V/cell) (2.5V/cell for a 3.6V battery regulation
setting), the IC charges the battery with 10% of
the fast charge setting current (ICC), and the
minimum pre-charge current is clamped to
100mA.
MP2759 Rev. 1.0
11/30/2020
Phase 3 (constant current fast charge): When
the battery voltage exceeds VBATT_PRE (3V/cell)
(2.5V/cell for 3.6V battery regulation setting),
the IC enters the constant current fast charge
phase. The charge current (ICC) can be set by
the ISET pin resistor.
Phase 4 (constant voltage charge): When the
battery voltage reaches the charge regulation
voltage (VBATT_REG), the charge current begins to
decrease. When the charge current drops to the
battery termination threshold (ITERM), the charge
cycle is considered complete after a deglitch
time (tTERM_DGL). If the charge current does not
reach ITERM before the charging safety timer
expires, then the charge cycle ends and the
corresponding timeout fault signal is asserted.
VBATT_REG
ICC
Battery
Voltage
VBATT_PRE
VBATT_TC
Charge
Current
IPRE
ITERM
ITC
Trickle
PreCharge Charge
CC Fast
Constant
Charge Voltage Charge
Safety
Timer
Figure 2: Typical Charge Profile
Charge Termination
The termination current threshold (ITERM) is 10%
of the fast charge setting current (ICC), and the
minimum termination threshold is clamped to
100mA.
Charging is terminated when all of the following
conditions are met:
The charge current is below the termination
threshold for the deglitch time (tTERM_DGL,
typically 100ms).
The IC operates in constant voltage charge
mode.
The IC is not in input current or input
voltage loop operation.
Auto-Recharge
Once the battery charging cycle completes, the
charger remains off. During this time, the
external load may consume battery power, or
the battery may self-discharge.
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13
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
A new charge cycle automatically begins if the
battery voltage falls below the auto-recharge
threshold and input power is present. The
charging safety timer resets when the autorecharge cycle begins.
Input Voltage and Input Current Limit
The MP2759 has input current and input
voltage limiting to avoid overloading the input
power supply.
The VLIM pin’s voltage is the feedback input for
the input voltage regulation loop. When the
VLIM pin voltage falls to 1.2V, the charge
current is reduced to prevent the input source
from being further overloaded.
The input voltage can be regulated by a resistor
divider connected from the IN pin to AGND. The
regulated input voltage can be calculated with
Equation (1):
VIN _ MIN _ REF VIN _ MIN
R1
(V)
R1 R2
(1)
Where VIN_MIN_REF is the internal voltage
reference (about 1.2V), VIN_MIN is the desired
regulation voltage, and R1 and R2 are the
resistor dividers.
When the VLIM pin’s voltage is pulled below
0.8V, the charger is disabled.
The input current limit (IIN_LIM) can be set by the
ILIM pin with a resistor (RILIM) connected to
AGND. If Q1’s input current reaches the preset
limit, the charge current is reduced to keep the
input current under regulation.
The input current limit can be estimated with
Equation (2).
IIN_LIM (A)=
80(kΩ)
(A)
RILIM (kΩ)
(2)
Cell Selection
The MP2759 can be configured to charge 1-cell
to 6-cell series battery packs. The number of
cells can be configured via the CELL pin (see
Table 1).
Table 1: CELL Pin Selection
CELL Pin Connection
Battery Cell Number
AGND
1-Cell Series
30kΩ to 40kΩ
2-Cell Series
60kΩ to 70kΩ
3-Cell Series
100kΩ to 110kΩ
4-Cell Series
160kΩ to 170kΩ
5-Cell Series
Pull up to VCC
6-Cell Series
With different series cell number selections, the
trickle charge to pre-charge threshold
(VBATT_TC), the pre-charge to fast charge
threshold (VBATT_PRE), the battery charge voltage
regulation (VBATT_REG), and the recharge
threshold (VRECH) all scale with the cell number
to properly manage the charging phases.
Battery Regulation Voltage
The MP2759 supports several battery charge
regulation voltages, which can be configured
via the VB pin (see Table 2).
Table 2: Battery Regulation Voltage Selection
Battery Regulation
VB Pin Connection
Voltage
AGND
3.6V
30kΩ to 40kΩ
100kΩ to 110kΩ
4.0V
4.15V/cell or 4.1V/cell
(set via the OTP, bit[5])
4.2V
160kΩ to 170kΩ
4.35V
Pull up to VCC
4.4V
60kΩ to 70kΩ
Charge Current Setting
The MP2759 senses the external sense resistor
to regulate the charge current. Generally, a
20mΩ sensing resistor is recommended. With a
20mΩ sensing resistor, the charge current can
be set by the resistor placed between the ISET
and AGND pins (RISET). ICC can be calculated
with Equation (3):
ICC (A)=
96(kΩ)
(A)
RISET (kΩ)
(3)
The maximum charge current can be set at up
to 3A, and is related to the PCB’s thermal
dissipation condition and the input voltage. With
a lower input voltage, the IC’s switching loss is
MP2759 Rev. 1.0
11/30/2020
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14
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
smaller, and the maximum deliverable current
can be higher. The charge current should be
set according to the thermal performance for
each application.
JEITA-Based Thermistor Qualification
The MP2759 monitors the battery temperature
by measuring the voltage ratio between the
NTC pin’s voltage and the VCC pin’s voltage.
The IC has four voltage ratio thresholds: hot,
warm, cool, and cold.
To initiate a charge cycle, the voltage on the
NTC pin must be within the VHOT to VCOLD range.
If the NTC pin voltage exceeds VHOT or falls
below VCOLD, the IC suspends charging and
waits for the NTC voltage to return to within its
normal range.
If the NTC voltage is within the cool
temperature range (VCOLD to VCOOL), the charge
current is reduced to 50% of the set value.
If the NTC voltage in within the warm
temperature range (VWARM to VHOT), the charge
regulation voltage is reduced by 100mV/cell of
the set value.
Charge Current
the battery over-voltage threshold (VBATT_OVP),
charging is disabled, the switcher stops, and
---------------
the fault status is reported on the STAT pin.
Charging Safety Timer
The IC provides a safety timer to prevent
extended charging cycles due to abnormal
battery conditions. If the charging timer finishes
before charging completes, charging is
terminated.
The safety timer resets at the beginning of a
new charge cycle. The safety timer restarts if
any of the following actions occur:
Input voltage removal and re-insertion
A new charge cycle starts
The VLIM pin is pulled below 0.8V, then
released
Operation Indication
---------------
--------------
The IC has ACOK and STAT pins to indicate
the power source and operation status. The
---------------
--------------
statuses of the ACOK and STAT pins change
based on different input power sources and
operating conditions (see Table 3).
Table 3: Operation Indications
50% of ICC
IN
Charge Voltage
100mV below
VBATT_REG
Absent
NA
Present
In charging
Present
Present
Cold
Cool
Warm
Hot
Figure 3: JEITA Protection
The recommend thermistor is 103AT with
β = 3435. It is also recommended to have a
pull-up resistor equal to the 25°C thermistor
resistance.
Battery Over-Voltage Protection (OVP)
The MP2759 has battery over-voltage
protection (OVP). If the battery voltage exceeds
MP2759 Rev. 1.0
11/30/2020
Charging State
Charging
complete,
charging disabled
NTC fault, safety
timer expires,
battery OVP
-----------------
---------------
ACOK
Hi-Z
STAT
Hi-Z
Low
Low
Low
Hi-Z
Low
Blinking
at 2Hz
One-Time Programmable (OTP)
The MP2759 has a one-time programmable
(OTP) memory function to configure the default
value of several parameters. See the OTP Map
section on page 16 for details on the
configurable parameters.
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15
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
OTP MAP
Bit #
Symbol
Default
10
JEITA_EN
0
0: JEITA enabled
1: JEITA disabled
9
VCOLD
0
Cold rising threshold as percentage of VNTC/VVCC.
0: 74% (0°C)
1: 70% (5°C)
8
VCOOL
0
Cool rising threshold as percentage of VNTC/VVCC.
0: 65% (10°C)
1: 60% (15°C)
7
VWARM
0
Warm falling threshold as Percentage of VNTC/VVCC.
0: 32.5% (45°C)
1: 29% (50°C)
6
VHOT
0
Hot falling threshold as percentage of VNTC/VVCC.
0: 23% (60°C)
1: 25.9% (55°C)
5
VREG_4P1
1
Description
The bit sets the battery regulation voltage when the VB pin’s resistor is
between 60kΩ and 70kΩ.
0: 4.1V/cell
1: 4.15V/cell
This bit sets the termination current.
4
ITERM
0
3
IPRE
0
2
FSW
0
1
TTMR
0
0: 10% of ICC
1: 20% of ICC
This bit sets the pre-charge current.
0: 10% of ICC
1: 20% of ICC
This bit selects the switching frequency.
0: 700kHz
1: 450kHz
This bit sets the charging safety timer.
0: 20hrs
1: 10hrs
This bit enables the safety timer.
0
EN_TMR
MP2759 Rev. 1.0
11/30/2020
0
0: Enabled
1: Disabled
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16
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
APPLICATION INFORMATION
COMPONENT SELECTION
Selecting the Inductor
Choose an inductor that does not saturate
under the worst-case load condition. Estimate
the required inductance with Equation (4):
L
VIN VBATT
V
BATT
IL _ MAX
VIN fSW
(4)
Where VIN is the input voltage, VBATT is the
battery voltage, fSW is the switching frequency,
and ∆IL_MAX is the maximum peak-to-peak
inductor current, which is usually designed at
30% to 40% of the CC charge current.
It is recommended to use a 10µH inductor with
a 5A saturation current for most applications.
Selecting the PMID Capacitor (CPMID)
The PMID pin capacitor (CPMID) serves as the
buck regulator’s decoupling capacitor. A
ceramic 2.2µF/50V capacitor with X5R or X7R
dielectrics and 1206 size is recommended.
Do not put additional capacitance on the PMID
pin. Connect a 2A/40V Schottky diode in an
SMA package from IN to PMID.
Selecting the IN Capacitor
For applications where the input is ≤20V, it is
recommended to make the input capacitor (CIN)
a 1µF/50V ceramic capacitor in a 0805 or 1206
package.
For applications where the input is >20V,
(especially for those with input hot insertion
conditions), add a ≥47µF electrolytic capacitor
on the IN pin.
If a high-voltage adapter is plugged in during
input hot insertion, the cable’s parasitic
inductance (together with the IN/PMID node
capacitance) can generate an inrush current
and voltage spike. An electrolytic capacitor and
a TVS diode can help dampen or clamp the
voltage spike.
The ESR of the electrolytic capacitor can
effectively damp the inrush oscillation
magnitude. A 47µF/50V electrolytic capacitor is
recommended (see Table 4).
MP2759 Rev. 1.0
11/30/2020
The hot insertion must be tested and verified for
real applications. In case of a higher input
voltage
application
(e.g.
28V),
it
is
recommended to place a TVS diode across IN
pin and GND pin. It is recommended to use one
of the following diodes:
1SMA33A from Sunmate in an SMA
package
SMAJ33AQ from Diode in an SMA package
Selecting the BATT Capacitor
The MP2759 requires a ≥10µF capacitor to
stabilize the loop on the BATT node. However,
the battery capacitor (CBATT) is generally
effective only during hot plug insertion or shortcircuit conditions.
When the battery is plugged in, there can be an
overshoot on the BATT pin due to the
oscillation caused by CBATT and battery cable
parasitic inductance. For 5-cell or 6-cell
applications, this overshoot may harm the
BATT pin. A 47µF/50V electrolytic capacitor can
damp the overshoot with its ESR. Otherwise,
use a TVS diode to clamp the BATT node spike.
The recommended TVS diodes are listed above.
If the BATT node can be shorted to ground,
CBATT and the cable inductance can induce a
negative voltage spike on the BATT pin, and
may harm the IC. An electrolytic capacitor can
help dampen the spike, or a unidirectional TVS
diode can clamp the spike (see Table 4).
Protecting the PMID Pin
When a high-voltage battery is plugged in, there
is a current path that flows from the main
inductor, high-side MOSFET body diode, then
charges up the PMID pin capacitor. An LC
resonant circuit may induce a voltage spike on
the PMID pin. With a high voltage battery, the
PMID voltage can rise to a dangerous level, so
the PMID pin must be protected.
For 5-cell or 6-cell applications, the PMID pin
overshoot of battery insertion should be tested
and verified in real application. A TVS diode
can be added on PMID node to clamp the
overshoot. The recommended TVS diodes are
listed above. If the PMID pin has a TVS diode,
the IN pin does not require a TVS diode (see
Table 4).
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17
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
Table 4: Components Selection Guide
Pin
Condition
≤20V input
IN
>20V input
BATT
1-cell to 4-cell
5-cell or 6-cell
PMID
-
Recommendations
1µF/50V ceramic capacitor for adapter applications. Add a ≥47µF capacitance for
solar applications.
Add a 47µF/50V electrolytic capacitor. A TVS diode is required if the IN voltage
exceeds the pin’s maximum voltage rating during a VIN hot insertion test.
10µF/50V ceramic capacitor.
Add a TVS diode or ≥47µF electrolytic capacitor.
Add a 2.2µF/50V ceramic capacitor (1206 size preferred). Connect a 2A/40V
Schottky diode from IN to PMID. A TVS diode is required if the PMID voltage
exceeds the pin’s maximum voltage rating during a VBATT hot insertion test.
Setting the VLIM Pin
The VLIM pin is capable of multiple functions,
described below.
Minimum Input Voltage Limiting
A resistive voltage divider connected from the
IN pin to VLIM pin sets the minimum input
voltage limit (VIN_MIN).
The maximum VIN_MIN regulation voltage should
be set below the power supply’s minimum DC
output voltage, including the IR voltage drop
from the DC input current and the series
resistance on the PCB, connector, and cable.
The minimum VIN_MIN regulation voltage should
be set above VBATT_REG + VHDRM.
Disable Minimum Input Voltage Limiting
If input voltage limiting is not required, the VLIM
pin can be tied to the VCC pin.
Enable Control
Pull the VLIM pin down below 0.8V to disable
the charger and reset the safety timer. Figure 4
shows a recommended application circuit for
this function.
IN
Input
CIN
R2
MP2759
VLIM
Enable Control
Q1
Signal
Direct Enable Control
If input voltage limiting is not used, the VLIM pin
can be directly driven by the host to
enable/disable charging. It is recommended to
use a 100kΩ resistor to pull the VLIM pin up to
VCC. The logic high level should be above
1.3V, and the logic low level should be below
0.4V.
Power Path Operation
With an external P-channel battery MOSFET,
the MP2759 supports power path management
(see Figure 5). The battery FET gate can be
driven by the IN pin signal. When an input
source is not present, the battery FET connects
the battery to the system. When an input is
present, the battery FET turns off, and the
system power is supplied by the input source
through Q1.
The input current limit function helps power
path operation because it prevents the input
source from becoming overloaded. If the total
input current in Q1 reaches the preset input
current limit, the charging current is reduced,
which keeps the input current limit within
regulation.
For applications where the battery regulation
voltage is below 15V, the battery FET gate can
be directly driven by the IN node. If the input
source is greater than 15V, use a Zener diode
circuit to protect the battery FET gate from an
over-voltage condition (see Figure 5).
R1
AGND
Figure 4: Enable Control
In this application, it is recommended to set R1
to 10kΩ.
MP2759 Rev. 1.0
11/30/2020
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18
MP2759 – 36V SWITCHING CHARGER FOR 1-6 CELL BATTERIES
System
CPMID
Zener
IN
PMID
QBATT
1MΩ
Q1
Input
IN
BATT
CIN
CBATT
Battery
Pack
PGND
MP2759
Figure 5: Power Path Management
Setting NTC Function
A JEITA profile is supported for battery
temperature management. The NTC thermistor
should be connected between the NTC pin and
ground, and a pull-up resistor (RH) should be
placed between the VCC and NTC pins. It is
recommended that the pull-up resistor value be
equal to the 25°C thermistor resistance.
VCC
RH
RNTC
MP2759
NTC
Figure 6: Thermistor Connection
The preset hot, warm, cool, and cold voltage
thresholds are defined for a β = 3435 thermistor.
A 103AT-2 thermistor with a 10kΩ pull-up
resistor is recommended.
Selecting the Current-Sense Resistor
The MP2759 senses the current-sense resistor
voltage drop to get the feedback information of
the battery charge current. The default
configuration is a 20mΩ resistor, and the data in
this datasheet is derived from that resistor value.
Note that the soldering tin for the resistor has a
resistance of about 1mΩ to 2mΩ, which can
introduce some current regulation error. This
error can be easily compensated for by finetuning the ISET pin resistor.
For smaller power applications, the currentsense resistor can be scaled up to improve
regulation accuracy. The charge current scales
inversely to the sensing resistor, such as the
MP2759 Rev. 1.0
11/30/2020
fast charge current (ICC), pre-charge current
(IPRE), trickle charge curent (ITC), and
termination current (ITERM).
PCB Layout Guidelines
PCB layout is important to meet specified noise,
efficiency and stability requirements. For the
best results, refer to Figure 7 and follow the
guidelines below:
1. Place the PMID capacitor as close as
possible to the PMID and PGND pins using
a short copper plane connection.
2. Place the PMID capacitor on the same layer
as the IC.
3. Minimize the high-frequency current path
loop between the PMID capacitor and the
buck converter power MOSFETs (PMID pin
to capacitor, PGND to capacitor) (see
Figure 7).
4. If possible, choose the PMID capacitor to
have a 1206 or 1210 dimension, and route
the SW traces beneath the PMID capacitor.
5. Minimize the copper area of the inductor’s
input terminal trace to reduce electrical and
magnetic field radiation, but ensure that the
trace is still wide enough to carry the
charging current.
6. Connect the AGND pin to the ground of the
battery capacitor, such as CBATT or the PCB
ground.
7. Connect the IC’s power pin to as many
copper planes as possible to conduct heat
away from the IC.
8. Ensure that the number and physical size of
the vias is sufficient for a current path.
PMID
SW
CPMID
PGND
Figure 7: High-Frequency Current Path
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19
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
TYPICAL APPLICATION CIRCUIT
D1
System
CPMID
Zener
IN
PMID
Q1
1MΩ
BST
Q2
Input
CBST
L1
SW
CIN
QBATT
RSNS
IN
CBATT
CSP
20kΩ
Q3
1S-6S
Battery
Pack
BATT
ACOK
MP2759
VLIM
ILIM
CELL
VB
VCC
VCC
STAT
NTC
2kΩ
ISET
PGND
AGND
CVCC
RNTC
Figure 8: OR Selection Power Path Typical Application Circuit
Table 5: Key BOM for Figure 8
Qty
Ref
Value
1
CIN
1μF
1
CBATT
10μF
1
CPMID
2.2μF
1
CVCC
1μF
1
CBST
100nF
1
1
L1
D1
10μH
B240
MP2759 Rev. 1.0
11/30/2020
Description
Ceramic capacitor, 50V,
X5R or X7R
Ceramic capacitor, 50V,
X5R or X7R
Ceramic capacitor, 50V,
X5R or X7R
Ceramic capacitor, 16V,
X5R or X7R
Ceramic capacitor, 16V,
X5R or X7R
Inductor, ISAT > 4A
Schottky diode, 2A/40V
Package
Manufacturer
0805
Any
1206
Any
1206
Any
0603
Any
0603
Any
SMD
SMA
Any
Any
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20
PACKAGE OUTLINE DRAWING FOR 19L FCQFN (3X3MM)-3
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
MF-PO-D-0477 revision 0.0
PACKAGE INFORMATION
QFN-19 (3mmx3mm)
PIN 1 ID
MARKING
PIN 1 ID
INDEX AREA
BOTTOM VIEW
TOP VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) LEAD COPLANARITY SHALL BE 0.08
MILLIMETERS MAX.
3) JEDEC REFERENCE IS MO-220.
4) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
MP2759 Rev. 1.0
11/30/2020
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21
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
CARRIER INFORMATION
1
Pin1
1
ABCD
1
1
ABCD
ABCD
ABCD
Feed Direction
Part Number
MP2759GQ-xxxx–Z
MP2759 Rev. 1.0
11/30/2020
Package
Description
QFN-19
(3mmx3mm)
Quantity/
Reel
Quantity/
Tube
Reel
Diameter
Carrier
Tape Width
Carrier
Tape Pitch
5000
N/A
13in
12mm
8mm
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22
MP2759 – 36V SWITCHING CHARGER FOR 1-CELL TO 6-CELL BATTERIES
Revision History
Revision #
1.0
Revision
Date
11/30/2020
Description
Initial Release
Pages
Updated
-
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.
MP2759 Rev. 1.0
11/30/2020
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23
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