MP2636_技术文档

MP2636

3.0A Single Cell Switch Mode Battery Charger

with Power Path Management (PPM)

and 3.0A System Boost Current

DESCRIPTION

FEATURES

The MP2636 is a highly-integrated, flexible

switch-mode battery charger with system power

path management, designed for single-cell Li-

ion or Li-Polymer batteries used in a wide range

of portable applications.



Up to 16V Sustainable Input Voltage

4.5V-to-6V Operation Voltage Range

Power Management Function, Integrated

Input-Current Limit, Input Voltage

Regulation



Up to 3.0A Programmable Charge Current

Trickle-Charge Function

Analog Voltage Output IB pin for Battery

Current Monitor

The MP2636 can operate in both charge mode

and boost mode to allow full system

management and battery power management.

When input power is present, the device

operates in charge mode. It automatically

detects the battery voltage and charges the

battery in three phases: trickle current, constant

current and constant voltage. Other features

include charge termination and auto-recharge.

This device also integrates both input current

limit and input voltage regulation in order to

manage input power and meet the priority of the

system power demand.



Selectable 4.2V / 4.3V / 4.35V Charge

Voltage with 0.5% Accuracy

Negative Temperature Coefficient Pin for

Temperature Monitoring

Programmable Timer Back-up Protection

Thermal Regulation and Thermal

Shutdown

Internal Battery Reverse Leakage Blocking

Integrated Over Current Protection and

Over Voltage Protection for Pass-through

Path

Reverse Boost Operation Mode for System

Power



In the absence of an input source, the MP2636

switches to boost mode through the MODE pin

to power the SYS pins from the battery. The

OLIM pin programs the output current limit in

boost mode. The MP2636 also allows an output

short circuit protection to completely disconnect

the battery from the load in the event of a short

circuit fault. Normal operation will recover as

soon as the short circuit fault is removed. The

MP2636 provides full operating status indication

to distinguish charge mode from boost mode. In

addition, the MP2636 can report the real battery

current in both charge and boost mode via IB

pin.



Up to 3.0A Programmable Output Current

Limit for Boost Mode

Integrated Short Circuit Protection and

Output Over Voltage Protection for Boost

Mode

APPLICATIONS



Sub-Battery Applications

Power-bank Applications for Smart-Phone,

Tablet and Other Portable Devices

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Products, Quality Assurance page.

The MP2636 achieves good EMI/EMC

performance with well controlled switching

edges.

“MPS” and “The Future of Analog IC Technology” are registered trademarks of

Monolithic Power Systems, Inc.

To guarantee safe operation, the MP2636 limits

the die temperature to a preset value of 120^oC.

Other safety features include input over-voltage

protection, battery over-voltage protection,

thermal

shutdown,

battery

temperature

monitoring, and a programmable timer to

prevent prolonged charging of a dead battery.

MP2636 Rev.1.01

5/1/2018

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1

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL APPLICATION

To 5V System

C_SYS

R₁

R₂

R_OLIM

C2

SYS

FB

OLIM

SW

IB

RS1

L1

5V Input

I_CHG

V_BATT

I_BATT

VIN

RH

C_IN

Q1

Q2

Q3

C_BATT

R3

R4

CSP

Battery

REG

Q4

BATT

VSYS

PWIN

RL

NTC

VB

Battery Voltage

Programmable Pin

MP2636

CHG

VCC

ACOK

FREQ

EN

C4

VCC

BOOST

ISET

MODE

ILIM

TMR

AGND

PGND

R_ILIM

C_TMRR_ISET

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

Table 1: Operation Mode

Power Source

__________

Operating

MODE

EN

Q1,Q2

Q3

Q4

ACOK

Mode

VIN

PWIN

Only Pass

Through Mode

Low

On

Off

V_BATT+300mV <V_IN< 6V

PWIN>0.8V

X

Low

High Charging Mode

SW

V_IN<V_BATT+300mV

X

Boost Discharge

Mode

X

High

Off

SW

Off

SW

Off

PWIN<0.8V

SYS Force-off

Mode

X

PWIN<0.8V

Low

X

V_IN> 6V

V_IN<2V

X

Input OVP

Off

Sleep Mode

X=Don’t Care.

On = Fully Turn On

Off = Fully Off

SW = Switching

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

ORDERING INFORMATION

Part Number

Package

Top Marking

MP2636GR

See Below

QFN-30 (4mmx4mm)

* For Tape & Reel, add suffix –Z (e.g. MP2636GR–Z)

TOP MARKING

MPS: MPS prefix:

Y: year code;

WW: week code:

MP2636: part number;

LLLLLL: lot number;

PACKAGE REFERENCE

TOP VIEW

28 27 26 25 24 23

BOOST

SW

1

2

3

4

5

6

7

8

22

21

20

19

18

17

16

15

IB

SW

SYS

29 SYS

30 VIN

SYS

VIN

VCC

ILIM

PWIN

TMR

CSP

BATT

VB

AGND

9

10 11 12 13 14

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

ABSOLUTE MAXIMUM RATINGS ⁽¹⁾

VIN to PGND ................................-0.3V to +20V

SYS to PGND ..............................-0.3V to +6.5V

SW to PGND....................... -0.3V (-2V for 20ns)

.................................. To + 6.5V (8.8V for 20ns)

Thermal Resistance ⁽⁴⁾θ_JAθ_JC

QFN-30 (4mmx4mm).............. 42........9.... 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 T_J(MAX), the junction-to-

ambient thermal resistance θ_JA, and the ambient temperature

T_A. The maximum allowable continuous power dissipation at

any ambient temperature is calculated by P_D(MAX) = (T_J

(MAX)-T_A)/θ_JA. 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.

BATT to PGND ...............................-0.3V to +5V

----------------- ------------- ---------------------

ACOK, CHG, BOOST to AGND

…... ..............................................-0.3V to +6.5V

All Other Pins to AGND................-0.3V to +6.5V

Continuous Power Dissipation

(2)

(T_A=+25C)

3) The device is not guaranteed to function outside of its

operating conditions.

4) Measured on JESD51-7, 4-layer PCB.

........................................................... 2.97W

Junction Temperature...............................150ºC

Lead Temperature ....................................260ºC

Storage Temperature...............–65C to +150ºC

Recommended Operating Conditions ⁽³⁾

Supply Voltage VIN............................4.5V to 6V

Battery Voltage BATT ..................2.5V to 4.35V

Operating Junction Temp (T_J).. -40C to +125C

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

ELECTRICAL CHARACTERISTICS

V_IN= 5V, T_A= +25ºC, unless otherwise noted.

Parameters

Symbol Condition

Min

Typ

30

Max

Units

mΩ

IN to SYS NMOS On Resistance R_{IN to SYS}

High-side PMOS On Resistance

Low-side NMOS On Resistance

R_{H_DS}

R_{L_DS}

25

mΩ

25

mΩ

Charger CC Mode/ Boost

Mode

8

4

Peak Current Limit for High-side

PMOS

I_{PEAK_HS}

A

Charger TC Mode

Peak Current Limit for Low-side

NMOS

I_{PEAK_LS}Boost Mode

5.5

A

Operating Frequency

F_SW

FREQ=LOW

600

kHz

VCC UVLO

V_{CC_UVLO}

2

2.2

85

2.4

V

mV

V

VCC UVLO Hysteresis

PWIN Threshold

V_{PWIN_L}

0.75

0.8

45

0.85

PWIN Threshold Hysteresis

Charge Mode

mV

EN=4V, BATT Float

EN=0V,

2.5

1.5

mA

Input Quiescent Current

I_IN

RS1 = 20mΩ, R_ISET< 60k,

as percentage of I_CC

Trickle Charge Current

I_TC

10

%

Minimum Trickle Charge Current

I_{TC_MIN}RS1 = 20mΩ, R_ISET>= 60k

200

3.01

3.043

2.94

240

mA

Connect VB to GND

2.91

2.94

2.84

3.112

3.145

3.04

Trickle Charge Voltage Threshold V_{BATT_TC}

Trickle Charge Hysteresis

V

Leave VB floating

Connect VB to High Logic

V_BATTfalling

mV

mA

RS1 = 20mΩ, R_ISET= 60.4k 1725

1987

2250

2825

Constant Charge (CC) Current

Termination Charge Current

I_CC

I_BF

RS1 = 20mΩ,

2225

2525

R_ISET= 47.5k

I_CHGfalling

150

4.3

Connect VB to GND

4.278

4.328

4.179

4.023

4.321

4.371

4.221

4.147

Terminal Battery Voltage

Recharge Threshold

V_{BATT_FULL}Leave VB floating

Connect to VCC

4.35

4.2

V

Connect VB to GND

4.085

V_RECH

Leave VB floating

Connect to VCC

4.07

3.93

4.132

3.99

4.195

4.05

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

ELECTRICAL CHARACTERISTICS (continued)

V_IN= 5V, T_A= +25ºC, unless otherwise noted.

Parameters

Symbol Condition

Min

Typ

200

Max

Units

Connect VB to GND

Leave VB floating

Connect to VCC

Recharge Threshold Hysteresis

mV

As percentage of

V_{BATT_FULL}

Battery Over Voltage Threshold

102.5

%

V

Input Voltage and Input Current Based Power Path

Input

Voltage

Regulation

V_REG

1.18

1.2

1.22

Reference

R_lLIM= 86.6k

R_lLIM= 51k

R_lLIM= 13k

R_lLIM= 86.6k

380

720

450

810

500

900

Input Current Limit

I_{IN_LMT}

mA

2940

3270

593

3600

Input Over Current Threshold

I_{IN_OCP}

R_lLIM= 51k

R_lLIM= 13k⁽⁵⁾

1000

4.09

mA

A

Input Over Current Shutdown

Blanking Time⁽⁵⁾

T_INOCBLK

T_INRECVR

120

100

µs

Input Over Current Shutdown

Recover Time⁽⁵⁾

ms

Boost Mode

SYS Voltage Range

Feedback Voltage

Feedback Input Current

4.2

6

V

1.18

1.2

1.22

200

V_FB=1V

nA

Threshold over V_SYSto

V_SYS(OVP)turn off the converter

during boost mode

SYS Over Voltage Protection

Threshold for Boost

5.8

6

6.2

V

SYS Over Voltage Protection

Threshold Hysteresis

V_SYSfalling from V_SYS(OVP)

125

430

mV

µA

I_SYS= 0, V_SYS= 5V,

V_FB= 2.0V, MODE = high,

BATT = 4.2V

Boost Quiescent Current

500

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

ELECTRICAL CHARACTERISTICS (continued)

V_IN= 5V, T_A= +25ºC, unless otherwise noted.

Parameters

Symbol Condition

Min

Typ

Max

Units

V_SYS= 5V, RS1 = 20m,

R_OLIM= 120k

774

910

1046

Programmable Boost Output

Current Limit Accuracy

I_OLIM

mA

V_SYS=5V, RS1 =20m,

R_OLIM= 47.5k

2088

2320

120

1.5

2552

SYS Over Current Blanking

Time⁽⁵⁾

T_SYSOCBLK

µs

SYS Over Current Recover

Time⁽⁵⁾

T_SYSRECVR

ms

During boosting

2.5

2.9

Weak Battery Threshold

V_BATT(LOW)

V

Before Boost starts

3.05

40

Sleep Mode

V_BATT=4.2V, SYS Float,

V_IN=GND, MODE=0V

Battery Leakage Current

I_BATT

μA

Indication& Logic

------------- ---------------------

----------------

ACOK, CHG, BOOST pin output

low voltage

Sinking 1.5mA

450

1

mV

uA

-------------

---------------------

----------------

ACOK , CHG , BOOST pin

leakage current

Connected to 5V

NTC and Time-out Fault Blinking

Frequency⁽⁵⁾

C_TMR= 0.1μF, I_CHG= 1A

13.7

Hz

V

EN, MODE Input Logic Low

Voltage

0.4

EN, MODE Input High Voltage

FREQ Input Logic Low Voltage

FREQ Input Logic High Voltage

VB Input Logic Low Voltage

VB Input Logic High Voltage

1.4

1.8

V

0.8

I_CHG=1A in charge mode

I_DIS=1A in boost mode

0.36

0.40

IB Voltage Output

Protection

C_TMR=0.1µF, Stay in TC

Mode, I_CHG= 2A

Trickle Charge Time

Total Charge Time

17

Mins

C_TMR=0.1µF, I_CHG= 2.5A

140

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

ELECTRICAL CHARACTERISTICS (continued)

V_IN= 5V, T_A= +25ºC, unless otherwise noted.

Parameters

Symbol Condition

Min

Typ

Max

Units

NTC Low Temp Rising Threshold

65.6%

66.6%

67.6%

R_NTC=NCP18XH103(0ºC)

V_CC

NTC Low Temp Rising Threshold

Hysteresis

1%

35%

1%

NTC

High

Temp

Rising

34%

36%

Threshold

R_NTC=NCP18XH103(50ºC)

Charge Mode

V_CC

NTC Low Temp Rising Threshold

Hysteresis

Charging

Current

Fold-back

120

150

ºC

Threshold⁽⁵⁾

Thermal Shutdown Threshold⁽⁵⁾

Notes:

5) Guaranteed by Design

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

PIN FUNCTIONS

Pin #

Name Description

Charge Current Represent. The voltage at this pin indicates the charge current to the battery

in charge mode and discharge current out of the battery in boost mode.

1

IB

Switch Output Node. It is recommended not to place Via’s on the SW plane during PCB

layout.

2, 21

SW

System Output. A minimum of 22μF ceramic cap is required to be put as close as

possible to the SYS and PGND pins. Total capacitance should NOT be lower than

44μF.

3, 20,

29

SYS

4, 19,

30

VIN

VCC

ILIM

Adapter Input. Place a bypass capacitor close to this pin to prevent large voltage spikes.

Internal Circuit Power Supply. Bypass this pin to GND with a 100nF ceramic capacitor. This

Pin CANNOT carry any external load.

5

6

Input Current Set. Connect to GND with an external resistor to program input current limit in

charge mode.

Input pin to detect the presence of valid input power. Pulling this pin to GND will turn off the

IN-to-SYS pass through MOSFET.

7

8

PWIN

TMR

Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set the

oscillator period for charge timer. Short to GND to disable the Timer function.

Input voltage feedback for the input voltage regulation loop. Connect to tap of an external

resistor divider from VIN to GND to program the input voltage regulation. Once the voltage at

REG pin drops to the inner threshold, the charge current is reduced to maintain the input

voltage at the regulation value.

9

REG

----------------

Valid Input Supply Indicator. Logic LOW at this pin indicates the presence of a valid power

supply.

10

ACOK

11

12

FB

System Voltage Feedback Input.

NTC

Negative Temperature Coefficient (NTC) Thermistor

13

14

ISET

Charge Current Set. Connect an external resistor to GND to program the charge current.

Programmable Output-Current Limit for Boost mode. Connect an external resistor to GND to

program the system current in Boost mode.

OLIM

15

16

AGND Analog Ground

Programmable Battery-Full Voltage. Connect to GND for 4.3V, leave floating to 4.35V, and

VB

connect to logic HIGH for 4.2V.

17

18

BATT Positive Battery Terminal / Battery Charge Current Sense Negative Input.

CSP

Battery Charge Current Sense Positive Input.

---------------------

Boost operation indicator. Logic LOW indicates boost operation. The pin becomes an open

drain when the part operates at charge mode or sleep mode.

22

23

BOOST

------------

Charging Completion Indicator. Logic LOW indicates charge mode. The pin becomes an

CHG

open drain once the charging has completed or is suspended.

__________

Mode Select. Logic HIGH→boost mode. Logic LOW→sleep mode. Active only when ACOK

is high (Input power is not available).

24

MODE

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

PIN FUNCTIONS (continued)

Pin #

Name Description

Charging Control Input. Logic HIGH enables charging. Logic LOW disables charging. Active

__________

25

EN

only when ACOK is low (Input power is Ok)

26

FREQ Connect to GND to figure the operating frequency to 600kHz.

PGND Power Ground.

27, 28

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL CHARACTERISTICS

V_IN= 5V, C_IN= C_BATT= C_SYS= C2 = 22µF, L1 = 1.5µH, RS1 = 20mΩ, C4 = C_TMR= 0.1µF, Battery

Simulator, unless otherwise noted.

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL PERFORMANCE CHARACTERISTICS

V_IN= 5V, C_IN= C_BATT= C_SYS= C2 = 22μF, L1 = 1.5μH, RS1 = 20mΩ, C4 = C_TMR= 0.1μF, Battery

Simulator, Unless Otherwise Noted.

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN= 5V, C_IN= C_BATT= C_SYS= C2 = 22μF, L1 = 1.5μH, RS1 = 20mΩ, C4 = C_TMR= 0.1μF, Battery

Simulator, Unless Otherwise Noted.

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN= 0V, V_BATT=3.7V, C_IN= C_BATT= C_SYS= C2 = 22μF, L1 = 1.5μH, RS1 = 20mΩ, C4 = C_TMR= 0.1μF,

Battery Simulator, Unless Otherwise Noted.

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN= 0V, V_BATT=3.7V, C_IN= C_BATT= C_SYS= C2 = 22μF, L1 = 1.5μH, RS1 = 20mΩ, C4 = C_TMR= 0.1μF,

Battery Simulator, Unless Otherwise Noted.

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN= 5V (typ.), V_BATT=3.7V (typ.), C_IN= C_BATT= C_SYS= C2 = 22μF, L1 = 1.5μH, RS1 = 20mΩ, C4 =

C_TMR= 0.1μF, Battery Simulator, Unless Otherwise Noted.

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN= 5V (typ.), V_BATT=3.7V (typ.), C_IN= C_BATT= C_SYS= C2 = 22μF, L1 = 1.5μH, RS1 = 20mΩ, C4 =

C_TMR= 0.1μF, Battery Simulator, Unless Otherwise Noted.

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

FUNCTIONAL BLOCK DIAGRAM (Charge Mode)

SYS

IB

FB

SW

Q1

Q2

HSMOS

VIN

Buffer

Current

Sense

LSMOS

A3

A1

CSP

VCC

Driver

BATT

K1*I_CHG

V_BATT

PWM Signal

Charge

Pump

PGND

ACOK

1.15V

V_BATT

FREQ

Mode Control

PWM Controller

VSYS

SYS

PWIN

0.8V

Control Logic&

Mode Selection

V_IN

NTC

V_BATT+0.3V

T_Ref

MODE

EN

GMT

T_J

VB

V_{BATT_Ref}

ACOK

Thermal

Shutdown

GMV

V_BATT

CHG

REG

BOOST

GMINV

Indication&

Timer

MIN

V_{REG_Ref}

I_{CHG_Ref}

GMI

ISET

ILIM

K1*I_CHG

I_{IN_Ref}

Current Setting

GMINI

TMR

K2*I_IN

OLIM

AGND

Figure 1 : Functional Block Diagram in Charger Mode

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

FUNCTIONAL BLOCK DIAGRAM (Boost Mode)

IB

SYS

FB

SW

Q1

Q2

HSMOS

VIN

A1

CSP

VCC

LSMOS

Driver

BATT

Charge

Pump

V_BATT

PWM Signal

Integration

ACOK

PGND

FREQ

To Current

Setting

1.15V

V_BATT

Mode Control

PWM Controller

PWIN

0.8V

VCC

Control Logic&

Mode Selection

NTC

BATT+

300mV

MODE

EN

VB

V_{SYS_Ref}

ACOK

CHG

Thermal

Shutdown

GMV

V_FB

REG

BOOST

Indication&

Timer

ISET

ILIM

I_{OLIM_Ref}

Current Setting

GMINI

TMR

K3*I_SYS

OLIM

AGND

Figure 2 : Functional Block Diagram in Boost Mode

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20

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

OPERATION FLOW CHART

POR

Yes

V_CC<V_{CC_UVLO}

No

V_PWIN> 0.8V & V_IN<6V

&V_IN>V_BATT+300mV

Yes

No

/ACOK is Low, System

Powered By IN

MODE High?

No

Yes

No

EN High?

Yes

Charger Mode

/CHG Low

Boost Mode

/BOOST Low

Sleep Mode

Figure 3: Mode Selection Flow Chart

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21

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

OPERATION FLOW CHART (Continued)

Normal Operation

Charger Mode

/CHG Low

Charge Mode?

V_BATT>V_{BATT_FULL}

V_{BATT_TC}<V_BATT<V_{BATT_FULL}

V_BATT<V_{BATT_TC}

C.V.C

C.C.C

T.C.C

No

I_CHG<I_BF

Battery Full

V_BATT>V_{BATT_FULL}

V_BATT>V_{BATT_TC}

Yes

Charger “Off”,

/CHG is high

Yes

No

V_BATT< V_RECH

?

No

Timer Out ?

Yes

NTC Fault?

T_J≥120^oC?

Yes

Charge

Termination, /CHG

is high

Charge Suspend,

/CHG is high

Decrease I_CHGto

maintain T_Jat 120^oC

No

Reset

Timer?

NTC OK?

T_J≥150^oC?

Yes

Charger Recovery,

Return to Normal

Operation

Thermal

Shutdown, /CHG is

high

No

T_J≤120^oC?

Yes

Fault Protection

Figure 4: Operation Flow Chart in Charger Mode

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22

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

OPERATION FLOW CHART (Continued)

Power Path Management

SYS Output

Current Increase

V_INtouch the V_{IN_R}

?

I_IN> I_{IN_LIMIT}?

No

Yes

Reduce the i_CHG

I_CHG≤0?

No

Yes

i_IN> 7A?

No

YES

Normal Operation

No

i_IN> 125% x I_{IN_LMT}

?

Yes

Try to regulate i_INat

125% x I_{IN_LMT}

Fast Turn Off the

IN-to-SYS MOSFET

No

i_IN> 140% x I_{IN_LMT}

for 120us?

Yes

Turn Off IN-to-SYS

MOSFET

No

100ms Timer

Expires?

Yes

Softly Turn On the

IN-to-SYS MOSFET

Figure 5: Power-path Management in Charge Mode

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23

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

OPERATION FLOW CHART (Continued)

Normal Boost

Operation

Yes

No

V_SYS<3.8V?

V_SYS<V_BATT+100mV?

No

Yes

I_L>4A?

Yes

No

120μs Blanking

Time pass?

Boost Shutdown

Start 1ms Timer

I_SYS> I_OLIM

?

Yes

No

Yes

Output current loop

keeps I_SYS=I_OLMT

V_SYSdecreases

1ms Timer

Expires?

,

No

Yes

Output Current Limit and Protection

Figure 6: Operation Flow Chart in Boost Mode

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24

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

START UP TIME FLOW IN CHARGE MODE

Condition: EN = 5V, Mode = 0V, /ACOK and /CHG are always pulled up to an external constant 5V

V_PWIN> 0.8V

0V

&

V_IN

V_IN> V_BATT+ 300mV

5V

0V

EN

Mode

V_CC

V_CCfollows V_IN

2.2V

Band

Gap

0V

5V

ACOK

0V

V_SYS> V_BATT+ 50mV

V_SYS

5V

0V

CHG

SS

400μs

150μs

Force

Charge

I_CC

10%I_CC

Charge

Current

0A

I_BF

Comparator

V_{BATT_FULL}

Battery

Voltage

Auto-recharge threshold

Assume v_BATT> V_{BATT_TC}

Auto-

recharge

Figure 7: Input Power Start-up Time Flow in Charge Mode

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25

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

START UP TIME FLOW IN CHARGE MODE

Condition: V_IN= 5V, Mode = 0V, /ACOK and /CHG are always pulled up to an external constant 5V.

0V

V_IN

5V

0V

EN

0V

Mode

V_CC

2.2V

Band

Gap

0V

5V

ACOK

0V

V_SYS

5V

0V

CHG

SS

400μs

150μs

Force

Charge

I_CC

10%I_CC

0A

Charge

Current

I_BF

Comparator

V_{BATT_FULL}

Battery

Voltage

Assume v_BATT> V_{BATT_TC}

Auto-

recharge

Figure 8: EN Start-up Time Flow in Charge Mode

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26

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

START UP TIME FLOW IN BOOST MODE

Condition: V_IN= 0V, Mode = 5V, /Boost is always pulled up to an external constant 5V.

2.5V

2.9V

0V

V_CCfollows V_SYS

V_BATT

V_CCfollows

V_BATT

2.2V

V_CC

MODE

Band

Gap

5V

0V

BOOST

1.2ms

Boost

SS

Down

Mode

V_SYS>V_BATT+300mV

0V

V_SYS

Figure 9: Battery Power Start-up Time Flow in Boost Mode

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27

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

START UP TIME FLOW IN BOOST MODE

Condition: V_IN= 0V, /Boost is always pulled up to an external constant 5V.

V_BATT

2.9V

V

_CCfollows V_SYS

V_CCfollows V_BATT

2.2V

0V

V_CC

5V

MODE

5V

Band

Gap

0V

5V

0V

BOOST

1.2ms

Boost

SS

Down

Mode

V_SYS>V_BATT+300mV

0V

V_SYS

Figure 10: Mode Start-up Time Flow in Boost Mode

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28

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

OPERATION

INTRODUCTION

The MP2636 is a highly-integrated, flexible,

synchronous switch-mode battery charger with

system power path management, designed for

single-cell Li-ion or Li-polymer batteries used in a

wide range of applications. Depending on the

status of the Input supply, the MP2636 can

operate in three modes: charge mode, boost

mode and sleep mode.

In charge mode, the MP2636 can work with

single cell Li-ion or Li-polymer battery. In boost

mode, MP2636 boosts the battery voltage to

V_{SYS_SET}to power higher voltage system rails. In

sleep mode both charging and boost operations

are disabled and the device enters a sleep mode

to help reduce the overall power consumption.

The MP2636 monitors V_INto allow smooth

transition between different modes of operation.

Figure 11: Typical Battery Charge Profile

Auto-recharge

CHARGER MODE OPERATION

Charge Cycle

In charge mode, the MP2636 has five control

loops to regulate input voltage, input current,

charge current, charge voltage and device

junction temperature. The MP2636 charges the

battery in three phases, trickle current (TC),

constant current (CC), and constant voltage (CV).

While charge operation is enabled, all five loops

are active but only one determines the IC

behavior. A typical battery charge profile is

depicted in Figure 11(a). The charger stays in TC

charge mode until the battery voltage reaches a

TC-to-CC threshold. Otherwise the charger

enters CC charge mode. When the battery

voltage rises to the CV-mode threshold, the

charger operates in constant voltage mode.

Figure 12(b) shows a typical charge profile when

the input-current-limit loop dominates during the

CC charge mode, and in this case the charger

maximizes the charging current due to the

switching-mode charging solution, resulting in

faster charging than a traditional linear solution.

Once the battery charge cycle completes, the

charger remains off. During this time, the external

load may consume battery power, or the battery

may self discharge. To ensure the battery will not

go into depletion,

a

new charge cycle

automatically begins when the battery voltage

falls below the auto-recharge threshold when the

input power is present. The timer is reset when

the auto-recharge cycle begins.

During the off state after the battery is fully

charged, if the input power re-starts or the EN

signal refreshes, the charge cycle will start and

the timer will re-set no matter what the battery

voltage is.

Battery Over-Voltage Protection

The MP2636 has battery over-voltage protection.

If the battery voltage exceeds the battery over-

voltage threshold, (102.5% of the battery full

voltage), charging is disabled. Under this

condition, an internal 5kΩ dummy load draws a

current from the BATT pin to decrease the

battery voltage and protect the battery.

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29

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

Timer Operation

minimum input voltage at 4.5V.

The MP2636 uses an internal timer to terminate

the charging. The timer remains active during the

charging process. An external capacitor between

TMR and GND programs the charge cycle

duration.

Boost Mode: Boost mode can be enabled via

the MODE pin as long as the input voltage is

higher than 6V or the voltage at PWIN is lower

than 0.8V.

Sleep Mode: when the input voltage is lower

than 2V, the MP2636 enters sleep mode

operation thus consuming very low current from

the battery.

If charging remains in TC mode beyond the

trickle-charge time, τ_{TC_TMR}, the charging will

terminate. The following equation determines the

length of the trickle-charge period:

Input Current Limiting in Charge Mode

4.510⁴1.6(V)C_TMR(F)

The MP2636 has a dedicated pin that programs

the input-current limit. The average input current

of the MP2636 is determined by the resistor

value between ILIM and GND. As the total input

current approaches the programmed input

current limit, charge current is reduced to allow

priority to system power.

(1)

_{TC _ TMR}



(s)

1.25I_TC(A)RS1(m)  2(A)

The maximum total charge time is:

3.410⁶1.6(V)C_TMR(F)

1.25I_CHG(A)RS1(m)  2(A)

(2)

_{TOTAL _ TMR}



(s)

Negative Thermal Coefficient (NTC) Input

Use the following equation to determine the input

current limit threshold,

The MP2636 has a built-in NTC resistance

window comparator, which allows MP2636 to

monitor the battery temperature via the battery-

integrated thermistor. Connect an appropriate

resistor from V_SYSto the NTC pin and connect the

thermistor from the NTC pin to GND. The resistor

divider determines the NTC voltage depending

on the battery temperature. If the NTC voltage

falls outside of the NTC window, the MP2636

stops charging. The charger will then restart if the

temperature goes back into NTC window range.

During the NTC fault, the charge timer is

suspended.

43.3(k)

R_ILIM(k)

(4)

I_ILIM(A) 

0.05

Input Voltage Regulation in Charge Mode

In charge mode, if the input power source is not

sufficient to support the charge current and

system load current, the input voltage will

decrease. As the input voltage approaches the

programmed input voltage regulation value, the

charge current is reduced to allow priority of the

system power and maintain proper regulation of

the input voltage.

Input Voltage Range for Different Operating

Mode

MP2636 operates in different mode based on the

state of the input. (see Table 1)

The input voltage can be regulated by resistor

divider from IN pin to REG pin to AGND

according to the following equation:

Charge Mode: A resistor divider connected to

the input and centered at PWIN pin determines

the input voltage UVLO point in charge mode of

the MP2636.

R4

R3 R4

(5)

V_REG V_{IN_R}

(V)

where V_REGis the internal voltage reference,

which is 1.2V, and the V_{IN_R}is the desired

regulation voltage.

RL

(3)

V_PWIN V 

(V)

IN

RHRL

If the voltage at PWIN pin is higher than 0.8V,

and the input voltage is lower than 6.0V, the

MP2636 works in the charge mode. During

normal operation (V_UVLO<V_IN<6.0V), the MP2636

can be forced into Boost Mode by pulling PWIN

pin to GND.

To achieve wide operation suggest set the

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30

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

Integrated Over Current Protection and Over

Charge Current Setting

Voltage Protection for Pass-through Path

The external sense resistors, RS1, and R_ISET,

program the battery charge current I_CHG. Select

R_ISETbased on RS1:

The MP2636 has an integrated IN-to-SYS pass-

through path to allow direct connection of the

input voltage to the system even if the charging is

disabled. Based on the above, the MP2636

continuously monitors the input current and

voltage. In the event of an input OC limit or input

UV limit, the charge current will be reduced to

ensure the priority of the system requirement.

2400

I_CHG(A) 

(6)

R_ISET(k)RS1(m)

Battery Current Analog Output

The MP2636 has an IB pin to report the real-time

battery current in both charge and boost mode.

The voltage at IB is a fraction of the battery

current given RS1 is 20mΩ.

In addition, the MP2636 also features input over

current and voltage protection for the IN to SYS

pass-through path.

V (V)  I_BATT(A)0.4(R)

(7)

(8)

Boost Mode:

IB

Input over-current protection (OCP):

V (V) I_CHG(A)0.36(R)

Charge Mode:

IB

The MP2636 implements input over-current

protection in 3 different ways:

Battery Short Protection

When battery voltage is lower than the TC-to-CC

threshold, Q3 peak current limit will be reduced

by half (please refer to the block diagram).

Furthermore PWM switching frequency will also

be reduced when V_BATTdrops 60% below of the

charge-full voltage.

a) When the total input current exceeds input

over-current threshold I_{IN_OCP}, which is 125%

of the input current limit threshold I_{IN_LMT}set by

R_ILIM, Q2 is controlled linearly to regulate the

input current.

b) When the current reaches input over-current

shutdown threshold I_{INOC_SHDN}(140% of the

I_{IN_LMT}) after a 120µs blanking time, Q2 will be

turned off, and then restarting after 100ms

recovery time.

Thermal Foldback Function

The MP2636 implements thermal protection to

prevent the thermal damage to the IC and the

surrounding components. An internal thermal

sense circuit and feedback loop automatically

decreases the programmed charge current when

the die-temperature reaches 120ºC. This function

is called the charge-current-thermal fold-back.

Not only this function protects against thermal

damage, it can also set the charge current based

on requirements rather than worst-case

conditions while ensuring safe operation.

Furthermore, the part includes thermal shutdown

protection where the ceases charging if the

junction temperature rises to 150ºC.

c) When the input current exceeds fast off

threshold (preset at 7A), both Q1 and Q2 are

turned off immediately, and then restarting

after 100ms recovery time.

Input over-voltage protection (OVP):

The MP2636 has a preset 6V input over voltage

threshold, once the input voltage exceeds the

OVP threshold, the IN-to-SYS pass-through path

will be bridged off to prevent the over voltage

event happening at SYS side when plugging in a

wrong adapter.

Constant-Off-Time Control for Large Duty

Charging Operation

The MP2636 has an internal 600kHz frequency

oscillator for the switching frequency. Unlike the

traditional fixed frequency, the MP2636 features

a constant-off-time control to support constant-

current charge even when the input voltage is

very close to the battery voltage. As shown in the

SYS

Q1

Q2

IN

Charge

Pump

Figure 12: IN-to-SYS Pass-through Path

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31

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

Figure 13, the MP2636 continuously compares

the high-side FET sense current with comp level,

if the sense current doesn’t reach the comp level

within the original switching period, the next clock

will be delayed until the sense current reaches

the comp level. As a result the duty cycle is able

to be extended as large as possible.

Fully Operation Indication

The MP2636 integrates indicators for the

following conditions as shown in Table2.

The blinking frequency is,

1(A)

0.8C_TMR(F)

(9)

F



Blinking

Table 2 Indication in Each Operation Mode

----------------

------------

-------------------

Operation

ACOK

CHG

BOOST

In Charging

Low

End of Charge,

Charging

disabled,

High

Charge

Mode

Low

High

Battery OVP

NTC Fault,

Timer Out

Blinking

Boost Mode

Sleep Mode

High

Low

High

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32

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

Comp

Slope Compensation

HS Sense Current

Constant Off Time

HS Signal

600kHz

Lower the Fsw to support larger Duty

Figure 13: Constant-Off-Time Operation Profile

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33

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

Boost Output Current Limiting

BOOST MODE OPERATION

The MP2636 integrates a programmable output

current limit function in boost mode. When the

boost output current exceeds the programmable

limit, the MP2636 will regulate the output current

at this limit and the SYS voltage will start to drop

down. The OLIM pin programs the current limit

threshold up to 3.0A as the following equation:

24000.92

Low Voltage Start-Up

The minimum battery voltage required to start up

the circuit in boost mode is 2.9V. Initially, when

V_SYS< V_BATT, the MP2636 works in down mode.

In this mode, the synchronous P-MOSFET stops

switching and its gate connects to V_BATTstatically.

The P_MOSFET keeps off as long as the voltage

across the parasitic C_DS(V_SW) is lower than V_BATT

.

I_OLIM(A) 

(10)

When the voltage across C_DSexceeds V_BATT, the

synchronous P-MOSFET enters linear mode

allowing the inductor current to decrease and

flowing into the SYS pin. Once V_SYSexceeds

V_BATT, the P-MOSFET gate is released and

normal close-loop PWM operation is initiated. In

boost mode, the battery voltage can drop to as

low as 2.5V without affecting circuit operation.

R_OLIM(k)RS1(m)

SYS Output Over-Current Protection

The MP2636 integrates three-phase output over-

current protection.

Phase one (boost mode output current limit):

when the output current exceeds the

programmed output current limit, the output

constant current loop controls the output current,

the output current remains at its limit of I_OLIM, and

V_SYSdecreases.

SYS Disconnect and Inrush Limiting

The MP2636 allows for true output disconnection

by eliminating body diode conduction of the

internal P-MOSFET rectifier. V_SYScan go to 0V

during shutdown, drawing no current from the

input source. It also allows for inrush current

limiting at start-up, minimizing surge currents

from the input supply. To optimize the benefit of

output disconnect, avoid connecting an external

Schottky diode between the SW and SYS pins.

Phase two (down mode): when V_SYSdrops below

V_BATT+100mV and the output current loop

remains in control, the boost converter enters

down mode and shutdown after a 120μs blanking

time. Then the boost converter will try to restart

after 1ms. At this time, the peak current limit will

be cut by half.

Board layout is extremely critical to minimize

voltage overshoot at the SW pin due to stray

inductance. Keep the output filter capacitor as

close as possible to the SYS pin and use very

low ESR/ESL ceramic capacitors tied to a good

ground plane.

Phase three (short circuit mode): when V_SYS

drops below 3.8V (will be 2.1V during boost soft

start), the boost converter shuts down

immediately once the inductor current hits the

fold-back peak current limit of the low side N-

MOSFET. The boost converter can also recover

automatically after a 1ms period. At this time, the

peak current limit will be cut by half.

Boost Output Voltage Setting

In boost mode, the MP2636 programs the output

voltage via the external resistor divider at FB pin,

and provides built-in output over-voltage

protection (OVP) to protect the device and other

components against damage when V_SYSgoes

beyond 6V. Once the output over voltage occurs,

the MP2636 turns off the boost converter. When

the voltage at SYS pin drops to a normal level,

the boost converter restarts as long as the

MODE pin remains in active status.

Thermal Shutdown Protection

The thermal shutdown protection is also active in

boost mode. Once the junction temperature rises

higher than 150°C, the MP2636 enters thermal

shutdown. It will not resume normal operation

until the junction temperature drops below 120ºC.

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34

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

TYPICAL APPLICATION CIRCUITS

Figure 14: The Detailed Application Circuit of MP2636

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35

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

Setting the Input Voltage Regulation in

Charge Mode

APPLICATION INFORMATION

COMPONENT SELECTION

In charge mode, connect a resistor divider from

the IN pin to AGND with tapped to REG pin to

program the input voltage regulation.

Setting the Charge Current in Charge Mode

In charge mode, both the external sense resistor,

RS1, and the resistor R_ISETconnect to the ISET

pin to set the charge current (ICHG) of the MP2636

(see the Typical Application circuit).

Given expected I_CHGand RS1, R_ISETcan be

calculated as:

R3 R4

(14)

V

 V_REG



(V)

IN_R

R4

With the given R4, R3 is:

 V_REG

V

IN_R

(15)

R3 

R4(V)

V_REG

2400

R_ISET(k) 

(11)

I_CHG(A)RS1(m)

For a preset input voltage regulation value, say

For example, for I_CHG=2.5A, and RS1=20mΩ,

R_ISET= 48kΩ.

4.75V, start with R4=5.1kΩ, R3 is 15kΩ.

NTC Function in Charge Mode

Given a 20mΩ RS1, the expected R_ISETfor typical

charge current listed as below:

Figure 14 shows that an internal resistor divider

sets the low temperature threshold (V_TL) and high

temperature threshold (V_TH) at 66.6%·V_SYSand

R_ISET(kΩ)

Charge Current (A)

35%·V_SYS

,

respectively. For

a

given NTC

120

80

60

48

40

1.0

1.5

2.0

2.5

3.0

thermistor, select an appropriate R_T1and R_T2to

set the NTC window.

R_T2//R_{NTC_Cold}

V_SYSR_T1R_T2//R_{NTC_Cold}

V_TL

(16)



 TL  66.6%

 TH  35%

Setting the Input Current Limiting in Charge

Mode

R_T2//R_{NTC_Hot}

V_SYSR_T1 R_T2//R_{NTC_Hot}

V_TH

(17)



In charge mode, connect a resistor from the ILIM

pin to AGND to program the input current limit.

The relationship between the input current limit

and setting resistor is as following:

43.3

Where R_{NTC_Hot}is the value of the NTC resistor at

the upper bound of its operating temperature

range, and R_{NTC_Cold}is its lower bound.

R_ILIM



(k)

(12)

The two resistors, R_T1and R_T2, independently

determine the upper and lower temperature limits.

This flexibility allows the MP2636 to operate with

most NTC resistors for different temperature

range requirements. Calculate R_T1and R_T2as

follows:

I_{IN_LIM}(A)  0.05

For most applications, use R_ILIM= 51kΩ

(IUSB_LIM=900mA) for USB3.0 mode, and use R_ILIM

= 86.6kΩ (I_{USB_LIM}=500mA) for USB2.0 mode.

Setting the Input Voltage Range for Different

Operation Modes

R_{NTC_Hot}R_{NTC _ Cold}(TL  TH)

A resistive voltage divider from the input to PWIN

pin determines the operating mode of MP2636.

RL

(18)

(19)

R_T1



TH TL(R_{NTC _ Cold}R_{NTC_Hot}

)

R_{NTC_Hot}R_{NTC _ Cold}(TL  TH)

(13)

V_PWIN V 

(V)

IN

R_T2



RHRL

TH(1 TL)R_{NTC _ Cold} TL(1 TH)R_{NTC_Hot}

If the voltage on PWIN is higher than 0.8V, the

MP2636 works in the charge mode. While the

voltage is lower than 0.8V, the MP2636 will work

in boost mode or sleep mode depending on the

MODE status. (see Table 1).

For example, the NCP18XH103 thermistor has

the following electrical characteristic:

At 0°C, R_{NTC_Cold}= 27.445kΩ;

At 50°C, R_{NTC_Hot}= 4.16kΩ.

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

Based on equation (18) and equation (19),

Given a 20mΩ RS1, the expected R_OLIMfor

RT1=6.65kΩ and RT2 = 25.63kΩ are suitable for

an NTC window between 0°C and 50°C. Chose

approximate values: e.g., R_T1=6.65kΩ and

R_T2=25.5kΩ.

typical output current limit listed as below:

R_OLIM(kΩ)

220.8

147.2

110.4

90.3

Output Current (A)

1.0

1.5

2.0

2.5

3.0

If no external NTC is available, connect R_T1and

R_T2to keep the voltage on the NTC pin within the

valid NTC window: e.g., R_T1= R_T2= 10kΩ.

73.6

Selecting the Inductor

SYS

Inductor selection trades off between cost, size,

and efficiency.

A

lower inductance value

Low Temp Threshold

R_T1

V_TL

corresponds with smaller size, but results in

higher current ripple, higher magnetic hysteretic

losses, and higher output capacitances. However,

a higher inductance value benefits from lower

ripple current and smaller output filter capacitors,

but results in higher inductor DC resistance (DCR)

loss.

NTC

R_NTC

R_T2

High Temp Threshold

V_TH

Figure 14: NTC Function Block

For convenience, an NTC thermistor design

spreadsheet is also provided, please inquire if

necessary.

Choose an inductor that does not saturate under

the worst-case load condition.

1.In Charge Mode

Setting the System Voltage in Boost Mode

In the boost mode, the system voltage can be

regulated to the value customer required

between 4.2V to 6V by the resistor divider at FB

pin as R1 and R2 in the typical application circuit.

When MP2636 works in charge mode (as a Buck

Converter), estimate the required inductance as:

V  V_BATT

V_BATT

IN

(23)

L 



I_{L _MAX}

V  f_SW

IN

R1R2

V_SYS 1.2V 

(20)

where V_IN, V_BATT, and f_SWare the typical input

voltage, the CC charge threshold, and the

switching frequency, respectively. ΔI_{L_MAX}is the

maximum peak-to-peak inductor current, which is

usually designed at 30%-40% of the CC charge

current.

R2

where 1.2V is the voltage reference of SYS. With

a typical value for R2, 10kΩ, R1 can be

determined by:

V_SYS1.2V

R1 R2

(V)

(21)

With a typical 5V input voltage, 35% inductor

current ripple at the corner point between trickle

charge and CC charge (V_BATT=3V, I_CHG=2.5A), the

inductance 2.2μH.

1.2V

For example, for a 5V system voltage, R2 is

10kΩ, and R1 is 31.6kΩ.

2.In Boost Mode

Setting the Output Current Limit in Boost

Mode

In boost mode, connect a resistor from the OLIM

pin to AGND to program the output current limit.

The relationship between the output current limit

and setting resistor is as follows:

When the MP2636 is in Boost mode (as a Boost

converter), the required inductance value is

calculated as:

V_BATT(V_SYS V_BATT

V_SYS f_SW I_{L _MAX}

)

(24)

(25)

L 

24000.92

R_OLIM(k)RS1(m)

I_OLIM(A) 

(22)

I_{L _MAX} 30%I_BATT(MAX)

The output current limit of the boost can be

programmed up to 3.0A.

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37

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

V_SYSI_SYS(MAX)

V_BATT 

V_TC(V_{SYS _MAX} V_TC)

(26)

I_BATT(MAX)



(28)

I_{RMS _MAX} I_{SYS _MAX}



V_{SYS _MAX}

Where V_BATTis the minimum battery voltage, f_SW

is the switching frequency, and ∆I_{L_MAX}is the

peak-to-peak inductor ripple current, which is

approximately 30% of the maximum battery

current I_BATT(MAX), I_SYS(MAX)is the system current

and η is the efficiency.

Since the input voltage is passes to the system

directly, V_{IN_MAX}=V_{SYS_MAX}, both charge mode and

boost mode have the same system current ripple.

For I_{SYS_MAX}=2A, V_TC=3V, V_{IN_MAX}=6V, the

maximum ripple current is 1A. Select the system

capacitors base on the ripple-current temperature

rise not exceeding 10°C. For best results, use

ceramic capacitors with X7R dielectrics with low

ESR and small temperature coefficients. For

most applications, use three 22µF capacitors.

In the worst case where the battery voltage is 3V,

a 30% inductor current ripple, and a typical

system voltage (V_SYS=5V), the inductance is

1.5µH when the efficiency is 90%.

For best results, use an inductor with an

inductance of 2.2uH with a DC current rating that

is not lower than the peak current of MOSFET

Selecting the Battery Capacitor C_BATT

C_BATTis in parallel with the battery to absorb the

high-frequency switching ripple current.

For higher efficiency, minimize the inductor’s DC

resistance.

1.Charge Mode

The capacitor C_BATTis the output capacitor of the

buck converter. The output voltage ripple is then:

Selecting the Input Capacitor C_IN

The input capacitor C_INreduces both the surge

current drawn from the input and the switching

noise from the device. The input capacitor

impedance at the switching frequency should be

less than the input source impedance to prevent

high-frequency-switching current from passing to

the input. For best results, use ceramic

capacitors with X7R dielectrics because of their

low ESR and small temperature coefficients. For

most applications, a 22µF capacitor will be

sufficient.

V_BATT

V_BATT

1 V_BATT/ V_SYS

8C_BATT f_SW²L

(29)

r_BATT



2.Boost Mode

The capacitor C_BATTis the input capacitor of the

boost converter. The input voltage ripple is the

same as the output voltage ripple from equation

(28)

Both charge mode and boost mode have the

same battery voltage ripple. The capacitor C_BATT

can be calculated as:

Selecting the System Capacitor C_SYS

Select C_SYSbased on the demand of the system

current ripple.

1 V_TC/ V_{SYS _MAX}

8 r_{BATT _MAX} f_SW²L

(30)

C_BATT



1.Charge Mode

The capacitor C_SYSacts as the input capacitor of

the buck converter in charge mode. The input

current ripple is:

To guarantee the ±0.5% BATT voltage accuracy,

the maximum BATT voltage ripple must not

exceed 0.5% (e.g. 0.2%). The worst case occurs

at the minimum battery voltage of the CC charge

with the maximum input voltage.

V_TC(V

 V_TC)

IN_MAX

(27)

I_{RMS _MAX} I_{SYS _MAX}



V

IN_MAX

For V_{SYS_MAX}=6V, V_{CC_MIN}=V_TC=3V, L=2.2µH,

f_SW=600kHz,

, C_BATTis 39µF.

r_{BATT _ MAX} 0.2%

2.Boost Mode

The capacitor, C_SYS, is the output capacitor of

boost converter. C_SYSkeeps the system voltage

ripple small and ensures feedback loop stability.

The system current ripple is given by:

Two pieces of 22µF ceramic with X7R dielectrics

capacitor in parallel will suffice.

PCB Layout Guide

PCB layout is very important to meet specified

MP2636 Rev.1.01

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38

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

noise, efficiency and stability requirements. The

following design considerations can improve

circuit performance:

2) For high-current applications, the power pads

for IN, SYS, SW, BATT and PGND should be

connected to as many coppers planes on the

board as possible. This improves thermal

performance because the board conducts heat

away from the IC.

1) Route the power stage adjacent to their

grounds. Aim to minimize the high-side switching

node (SW, inductor) trace lengths in the high-

current paths.

3) The PCB should have a ground plane

connected directly to the return of all components

through vias (e.g., two vias per capacitor for

power-stage capacitors, one via per capacitor for

small-signal components). A star ground design

approach is typically used to keep circuit block

currents isolated (power-signal/control-signal),

which reduces noise-coupling and ground-

bounce issues. A single ground plane for this

design gives good results.

Keep the switching node short and away from all

small control signals, especially the feedback

network.

Place the input capacitor as close as possible to

the VIN and PGND pins. The local power input

capacitors, connected from the SYS to PGND,

must be placed as close as possible to the IC.

Place the output inductor close to the IC and

connect the output capacitor between the

inductor and PGND of the IC.

4) Place ISET, OLIM and ILIM resistors very

close to their respective IC pins.

BATT

GND

SYS

GND

BOOST

SW

IB

SW

SYS

VIN

VCC

ILIM

PWIN

TMR

SYS

VIN

CSP

BATT

VB

SYS

VIN

AGND

VIN

AGND

Figure 15: PCB Layout Guide

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39

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

PACKAGE INFORMATION

QFN-30 (4mmx4mm)

PIN 1 ID

0.20x45° TYP.

PIN 1 ID

MARKING

PIN 1 ID

INDEX AREA

TOP VIEW

BOTTOM VIEW

SIDE VIEW

0.20x45°

NOTE:

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) DRAWING CONFORMS TO JEDEC MO-220.

5) DRAWING IS NOT TO SCALE.

RECOMMENDED LAND PATTERN

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.

MP2636 Rev.1.01

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40


型号：	MP2636
厂家：	MONOLITHIC POWER SYSTEMS
描述：	3.0A Single Cell Switch Mode Battery Charger with Power Path Management (PPM) and 3.0A System Boost Current 电池
文件：	总40页 (文件大小：2138K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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