MP2633A_技术文档

MP2633A

1.5A Single Cell Switch Mode Battery Charger

with Power Path Management and Boost OTG

The Future of Analog IC Technology

DESCRIPTION

FEATURES

The MP2633A is a highly-integrated, flexible,

switch-mode battery charge management and

system power path management device for a

single-cell Li-ion and Li-Polymer battery used in

a wide range of portable applications.



4.5V-to-6V Operating Input Voltage Range

Integrated Input-Current-Based Power

Management Function

Up to 1.5A Programmable Charge Current

Trickle-Charge Function



Selectable 3.6V/ 4.2V Charge Voltage with

0.5% Accuracy

The MP2633A has two operating modes—

charge mode and boost mode—to allow

management of system and battery power

based on the state of the input.



Negative Temperature Coefficient Pin for

Battery Temperature Monitoring

Programmable Timer Back-Up Protection

Thermal Regulation and Thermal Shutdown

Internal Battery Reverse Leakage Blocking

Reverse Boost Operation Mode for System

Power

Up to 91% 5V Boost Mode Efficiency @ 1A

Programmable Output Current Limit for

Boost Mode



When input power is present, the device

operates in charge mode. It automatically

detects the battery voltage and charges the

battery in the three phases: trickle current,

constant current and constant voltage. Other

features include charge termination and auto-

recharge. This device also integrates input

current limit in order to manage input power and

meet the priority of the system power demand. .



Integrated Short Circuit Protection for Boost

Mode

In the absence of an input source, the

MP2633A 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 MP2633A also

allows an output short-circuit thanks to an

output disconnect feature, and can auto-recover

when the short circuit fault is removed.

APPLICATIONS



Sub-Battery Applications

Power-Bank Applications for Smart-Phone,

Tablet and other Portable Device

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.

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

Monolithic Power Systems, Inc.

The MP2633A provides full operating status

indication to distinguish charge mode from

boost mode.

The MP2633A achieves low EMI/EMC

performance with well-controlled switching

edges.

To guarantee safe operation, the MP2633A

limits the die temperature to a preset value

120^oC. Other safety features include input over-

voltage

protection,

thermal

battery

shutdown,

over-voltage

battery

temperature monitoring, and a programmable

timer to prevent prolonged charging of a dead

battery.

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

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1

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

TYPICAL APPLICATION

To 5V System

C_SYS

R₁

R₂

R_OLIM

C2

SYS

FB

OLIM

SW

RS1

L1

5V Input

C_IN

IN

I_CHG

V_BATT

I_BATT

R4

C1

R3

R5

C3 C_BATT

CSP

Battery

REG

BATT

VSYS

PWIN

R6

NTC

VB

Battery Voltage

Programmable Pin

GND: 3.6V

High/Float: 4.2V

MP2633A

CHG

VCC

ACOK

FREQ

EN

C4

VCC

BOOST

ISET

MODE

ILIM

TMR

AGND

PGND

R_ILIM

C_TMRR_ISET

Table 1: Operation Mode

__________

Power Source

EN

High

Low

X

MODE Operating Mode

ACOK

Charge Mode, Enable Charging

Charge Mode, Disable Charging

Boost Mode

0.8V<PWIN<1.15V & V_IN>V_BATT+300mV

Low

X

PWIN<0.8V or PWIN >1.15V or

V_IN<V_BATT+300mV

High

Low

V_IN<2V

X

Sleep Mode

X=Don’t Care.

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

2

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

ORDERING INFORMATION

Part Number*

Package

Top Marking

MP2633AGR

QFN24 (4×4mm)

MP2633

* For Tape & Reel, add suffix –Z (e.g. MP2633AGR–Z);

PACKAGE REFERENCE

TOP VIEW

24

23 22 21 20 19

FREQ

VIN

1

2

3

4

5

6

18 CHG

17 BOOST

16 CSP

15 BATT

14 VB

VCC

ILIM

PWIN

TMR

13 AGND

7

8

9

10

11 12

EXPOSED PAD

ON BACKSIDE

ABSOLUTE MAXIMUM RATINGS ⁽¹⁾

VIN.................................................–0.3V to 20V

SYS, SW.......................................–0.3V to 6.5V

Thermal Resistance ⁽⁴⁾

QFN24 (4×4mm)..................... 42........9 ... °C/W

θ_JA

θ_JC

Notes:

BATT.............................................–0.3V to 6.5V

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.

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

ACOK, CHG, BOOST ...................–0.3V to 6.5V

All Other Pins................................–0.3V to 6.5V

Junction Temperature...............................150°C

Lead Temperature ....................................260°C

(2)

Continuous Power Dissipation (T_A= +25°C)

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

Junction Temperature...............................150°C

Operating Temperature............. –20°C to +85°C

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⁾

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

Battery Voltage V_OUT.....................2.5V to 4.35V

Operating Junction Temp. (T_J).−40°C to +125°C

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

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3

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

ELECTRICAL CHARACTERISTICS

V_IN= 5.0V, T_A= 25°C, unless otherwise noted.

Parameter Symbol Condition

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

Min

Typ

100

72

Max

Units

mΩ

High-side PMOS ON Resistance

Low-side NMOS ON Resistance

R_{H DS}

R_{L DS}

mΩ

70

mΩ

CC Charge Mode/Boost

Mode

3

A

High-Side PMOS Peak Current

Limit

I_{PEAK_HS}

TC Charge Mode

1.5

2.5

Low-Side NMOS Peak Current

Limit

I_{PEAK_LS}

FREQ = 0

600

1200

2.2

Switching Frequency

f_SW

kHz

FREQ = Float/ High

VCC UVLO

V_{CC UVLO}

2

2.4

0.85

1.2

V

mV

V

VCC UVLO Hysteresis

PWIN, Lower Threshold

Lower Threshold Hysteresis

PWIN, Upper Threshold

Upper Threshold Hysteresis

Charge Mode

100

0.8

V_{PWIN L}

V_{PWIN H}

0.75

1.1

40

mV

V

1.15

65

mV

EN = 5V, Battery Float

EN = 0

2.5

1.5

mA

Input Quiescent Current

I_IN

R_lLIM= 90.9k

400

720

450

810

2000

3

500

900

2200

Input Current Limit

I_{IN_LIMIT}R_lLIM= 49.9k

R_lLIM= 20k

mA

1800

Input Over-Current Threshold

I_IN(OCP)

A

Input Over-Current Blanking

Time⁽⁵⁾

τ_INOCBLK

τ_INRECVR

120

µs

Input Over-Current Recovery

Time⁽⁵⁾

100

3.6

ms

V

Connect VB to GND

3.582

4.179

3.35

3.618

4.221

3.45

Terminal Battery Voltage

Recharge Threshold

V_{BATT_FULL}

Leave VB floating or

connect to logic HIGH

4.2

Connect to VB to GND

3.4

V_RECH

Leave VB floating or

connect to logic HIGH

3.91

3.96

4.01

V

Recharge Threshold Hysteresis

Battery Over Voltage Threshold

200

103.3%

1000

mV

V_{BATT FULL}

RS1 = 40mΩ, R_ISET= 69.8k

900

1100

1650

Constant Charge (CC) Current

I_CC

mA

RS1 = 40mΩ, R_ISET= 46.4k 1350

1500

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

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4

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

ELECTRICAL CHARACTERISTICS

V_IN= 5.0V, T_A= 25°C, unless otherwise noted.

Parameter

Symbol Condition

Min

Typ

10%

2.57

Max

Units

Trickle-Charge Current

I_TC

I_CC

Connect to VB to GND

2.47

2.9

2.67

3.1

Trickle-Charge Voltage

Threshold

V_{BATT_TC}

V

Leave VB floating or connect

to high logic

3

Trickle-Charge Hysteresis

Termination Charge Current

60

mV

I_CC

I_BF

R_ISET= 70K

5%

10%

15%

1.22

Input-Voltage-Regulation

Reference

V_REG

1.18

1.2

V

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 turn

off the converter during

boost mode

Boost SYS Over-Voltage

Protection Threshold

V_SYS(OVP

)

5.8

6

6.2

V

SYS Over-Voltage Protection

Threshold Hysteresis

V_SYSfalling from V_SYS(OVP)

I_SYS= 0, MODE = 5V

125

mV

mA

A

Boost Quiescent Current

1.4

1.1

Programmable Boost Output

Current Limit Accuracy

I_OLIM

RS1 = 40mΩ, R_OLIM= 69.8k

0.9

1

Programmable Boost Output

Current⁽⁵⁾

A

RS1 = 50mꢀ, R_OLIM=56k

SYS Over-Current Blanking

Time⁽⁵⁾

τ_SYSOCBLK

τ_SYSRECVR

V_BATT(LOW)

120

500

µs

SYS Over-Current Recovery

Time⁽⁵⁾

During Boost mode

Before Boost mode

2.5

2.9

V

Weak-Battery Threshold

3.05

30

Sleep Mode

V_BATT= 4.2V, SYS Float,

Battery Leakage Current

I_LEAKAGE

15

μA

V_IN= 0V, MODE = 0V

Indication and Logic

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

ACOK, CHG, BOOST pin

output low voltage

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

Sinking 1.5mA

400

1

mV

ACOK, CHG, BOOST pin

leakage current

Connected to 5V

μA

NTC and Time-Out Fault

Blinking Frequency⁽⁵⁾

C

_TMR=0.1μF, I_CHG=1A

13.7

Hz

EN Input Logic LOW Voltage

EN Input High Voltage

0.4

V

1.4

Mode Input Logic LOW Voltage

Mode Input Logic HIGH Voltage

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

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5

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

ELECTRICAL CHARACTERISTICS

V_IN= 5.0V, T_A= 25°C, unless otherwise noted.

Parameter

Protection

Symbol Condition

Min

Typ

Max

Units

C

_TMR=0.1µF, remains in TC

Trickle-Charge Time

60

Min

mode, I_CHG= 1A

Total Charge Time

C_TMR=0.1µF, I_CHG= 1A

360

66%

NTC Low Temp, Rising

Threshold

65%

34%

67%

36%

R_NTC=NCP18XH103(0°C)

NTC Low Temp, Rising

Threshold Hysteresis

1%

35%

1%

V_SYS

NTC High Temp, Rising

Threshold

R

_NTC=NCP18XH103(50°C)

NTC High Temp, Rising

Threshold Hysteresis

Charging Current Fold-back

Charge Mode

120

150

°C

Threshold⁽⁵⁾

Thermal Shutdown Threshold⁽⁵⁾

Notes:

5) Guaranteed by design.

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

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6

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

TYPICAL CHARACTERISTICS

C_IN=C_BATT=C_SYS=C3=22µF, C1=C2=1µF, L1=4.7µH, RS1=50mΩ, C4=C_TMR=0.1µF, Battery Simulator,

unless otherwise noted.

2

1.5

1

1.6

1.2

0.8

1.00

0.00

-1.00

0.5

-2.00

-3.00

0.4

0

40

80

120

160

60

80

100

120

140

4

4.5

5

5.5

6

1200

6

BATT=Float

1000

800

600

400

5.6

5.2

4.8

4.4

4

200

0

4

4.5

5

5.5

6

0

0.5

1

1.5

2

2.5

1.5

1.2

5.00

3.00

1.2

1

0.8

0.6

1.00

0.9

0.6

-1.00

-3.00

-5.00

0.4

0.2

0

0.3

0

40 70 100 130 160 190 220

80

100

120

140

3

3.4

3.8

4.2

MP2633A Rev. 1.03

4/27/2016

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7

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

TYPICAL PERFORMANCE CHARACTERISTICS

V_IN=5V, C_IN=C_BATT=C_SYS=C3=22µF, C1=C2=1µF, L1=2.2µH, RS1=50mΩ, C4=C_TMR=0.1µF, Battery

Simulator, unless otherwise noted.

CHGOK

2V/div.

BATT

100mV/div.

CHGOK

2V/div.

V

SW

2V/div.

CHGOK

5V/div.

V

BATT

V

1V/div.

IN

V

IN

1V/div.

V

BATT

1V/div.

I

1A/div.

200mV/div.

I

CHG

1A/div.

I

L

200mA/div.

V

SW

2V/div.

V

IN

1V/div.

BATT

2V/div.

1V/div.

BATT

2V/div.

V

BATT

V

2V/div.

I

L

I

L

500mA/div.

L

1A/div.

100

90

80

70

95

90

85

80

60

50

0

1

2

3

4

5

0

0.5

1

1.5

2

BATTERY VOLTAGE (V)

CHARGE CURRENT (A)

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

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8

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN=5V, C_IN=C_BATT=C_SYS=C3=22µF, C1=C2=1µF, L1=2.2µH, RS1=50mΩ, C4=C_TMR=0.1µF, Battery

Simulator, unless otherwise noted.

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

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9

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN=5V, C_IN=C_BATT=C_SYS=C3=22µF, C1=C2=1µF, L1=2.2µH, RS1=50mΩ, C4=C_TMR=0.1µF, Battery

Simulator, unless otherwise noted.

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

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10

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN=5V, C_IN=C_BATT=C_SYS=C3=22µF, C1=C2=1µF, L1=2.2µH, RS1=50mΩ, C4=C_TMR=0.1µF, Battery

Simulator, unless otherwise noted.

V

SYS

1V/div.

V

BATT

1V/div.

V

BATT

2V/div.

V

SYS

V

SYS

2V/div.

1V/div.

BOOST

2V/div.

I

L

500mA/div.

V

/AC

V

/AC

SYS

V

/AC

SYS

200mV/div.

V

BATT

1V/div.

I

SYS

500mA/div.

100

90

80

70

60

50

40

30

90

80

70

60

50

40

30

0

0.25

0.5

0.75

1

0

0.25

0.5

0.75

1

MP2633A Rev. 1.03

4/27/2016

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11

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

PIN FUNCTIONS

Pin #

Name Description

Connect to GND to program the operating frequency to 600kHz. Leave floating or connect to

HIGH to program the operating frequency to 1.2MHz.

1

2

3

FREQ

VIN

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

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

not carry external load higher than 5mA.

VCC

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

charge mode.

4

5

6

ILIM

PWIN AC Input Detect. Detect the presence of valid input power.

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

oscillator period. Short to GND to disable the Timer function.

TMR

Input Voltage Feedback. Connect to tap of an external resistor divider from VIN to GND. The

voltage on this pin should be always exceeded 1.2V during normal operation.

7

8

REG

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

Valid Input Supply Indicator. Logic LOW indicates the presence of a valid power supply.

System Voltage Feedback.

ACOK

FB

9

10

11

NTC Negative Temperature Coefficient (NTC) Thermistor.

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

Boost-Output-Current Limit Set. Connect an external resistor to GND to program the system

current in boost mode.

12

13

14

OLIM

AGND Analog Ground

Programmable Battery-Full Voltage. Connect to GND for 3.6V. Leave floating or connect to

logic HIGH for 4.2V.

VB

15

16

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

CSP Battery Charge Current Sense, Positive Input.

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

Boost Mode Indicator. Logic LOW indicates boost mode in operation. This pin becomes an

open drain when the part operates in charge mode or sleep mode.

17

18

BOOST

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

Charge Completion indicator. Logic LOW indicates charge mode. The pin becomes an open

drain once the charging has completed or is suspended.

CHG

PGND,

19

Exposed Power Ground. Connect the exposed pad and GND pin to the same ground plane.

Pad

20

SW

Switch Output Node.

System Output. Please make sure the enough bulk capacitors from SYS to GND. Suggest

21, 22

SYS

4.7uF at least.

__________

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

HIGH (input power is not available).

23

24

MODE

EN

Charge Control Input. Logic HIGH enables charging. Logic LOW disables charging. Active only

__________

when ACOK is low (input power is OK)

MP2633A Rev. 1.03

4/27/2016

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12

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

SYS

FB

SW

Q1

Q2

HSMOS

VIN

Buffer

Current

Sense

LSMOS

A1

CSP

VCC

Driver

BATT

K1*I_CHG

V_BATT

PWM Signal

Charge

Pump

PGND

ACOK

V_BATT

PWIN

FREQ

0.8V

Mode Control

PWM Controller

1.15V

VCC

VSYS

SYS

Control Logic &

Mode Selection

BATT+

300mV

NTC

T_Ref

MODE

GMT

T_J

EN

VB

V_{BATT_Ref}

ACOK

Thermal

Shutdown

GMV

V_BATT

CHG

REG

BOOST

GMINV

Indication&

Timer

MIN

V_{REG_Ref}

GMI

I_{CHG_Ref}

K1*I_CHG

ISET

ILIM

I_{IN_Ref}

Current Setting

GMINI

TMR

K2*I_IN

OLIM

AGND

Figure 1: Functional Block Diagram,in Charge Mode

MP2633A Rev. 1.03

4/27/2016

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13

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

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

V_BATT

PWIN

0.8V

Mode Control

PWM Controller

1.15V

VCC

Control Logic &

Mode Selection

BATT+

300mV

NTC

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

MP2633A Rev. 1.03

4/27/2016

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14

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

OPERATION FLOW CHART

POR

Yes

V_CC<V_{CC_UVLO}

No

V_{PWIN_L}<V_PWIN<V_{PWIN _H}

&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

MP2633A Rev. 1.03

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15

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

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: Normal Operation and Fault Protection in Charge Mode

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16

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

OPERATION FLOW CHART (Continued)

Power Path Management

SYS Output

Current Increase

V_PWINtouch the V_REG

?

I_INhit the I_{IN_LIMIT}?

No

Yes

Charge Current

Decrease

I_CHG=0?

Yes

No

I_IN>7A?

No

Normal Operation

I_INexceeds I

?

IN(OCP)

No

Yes

Regulate the I at

IN

I_IN(OCP)

No

Yes

T_INOCBLKreaches?

Yes

IN to SYS MOSFET

turns Off

No

T_INRECVRreaches?

Figure 5: Power-Path Management in Charge Mode

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17

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

OPERATION FLOW CHART (Continued)

Boost Mode

Normal Boost

/BOOST Low

Operation

No

I_SYS> I_OLIM

?

V_BATT>2.9V?

Yes

Output current loop

works, V_SYSdecreases

No

Mode High?

Yes

V_SYS< V_BATT

?

Yes

Normal Boost

Operation

V_SYS< 2V?

Yes

No

Yes

No

V_BATT<2.5V?

Yes

Down mode

No

I_Lhits the

current limit

T_SYSBLKReaches?

Yes

Boost Turns Off

Yes

Boost Shutdown

No

T_SYSRECVR

Reaches?

Figure 6: Operation Flow Chart in Boost Mode

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MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

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

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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MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

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

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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20

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

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

Boost

SS

Down

Mode

0V

V_SYS>V_BATT+300mV

V_SYS

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

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21

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

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

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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MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

voltage falls below the auto-recharge threshold

OPERATION

CC>>>CV

Threshold

INTRODUCTION

Constant

Charge

Current

The

MP2633A

is

a

highly-integrated,

I_CHG

synchronous, switching charger with bi-

directional operation for a boost function that can

step-up the battery voltage to power the system.

Depending on the VIN value, it operates in one of

three modes: charge mode, boost mode and

sleep mode. In charge mode, the MP2633A

supports a precision Li-ion or Li-polymer charging

system for single-cell applications. In boost mode,

MP2633A boosts the battery voltage to V_SYSto

power higher-voltage systems. In sleep mode,

the MP2633A stops charging or boosting and

operates at a low current from the input or the

battery to reduce power consumption when the

IC isn’t operating. The MP2633A monitors VIN to

allow smooth transition between different modes

of operation.

V_BAT

TC>>>CC

Threshold

Trickle

Charge

Current

Trickle charge CC charge

CV charge Charge Full

a) Without input current limit

Constant

Charge

Current

CC>>>CV

Threshold

I_CHG

Input

Current

Limit

V_BAT

TC>>>CC

Threshold

Trickle

Charge

Current

Trickle charge CC charge

CV charge Charge Full

b) With input current limit

CHARGE MODE OPERATION

Figure 11: Typical Battery Charging Profile

Charge Cycle (Trickle ChargeCC

ChargeCV Charge)

and the input power is present. The timer resets

when the auto-recharge cycle begins.

In charge mode, the MP2633A has four control

loops to regulate the input current, charge current,

charge voltage, and device junction temperature.

It charges the battery in three phases: trickle

current (TC), constant current (CC), and constant

voltage (CV). While charging, all four loops are

active but only one determines the IC behavior.

Figure 11(a) shows a typical battery charge

profile. 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 11(b) shows a

typical charge profile when the input-current-limit

loop dominates during the CC charge mode, and

in this case the charge current exceeds the input

current, resulting in faster charging than a

traditional linear solution that is well-suited for

USB applications.

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 reset no matter what the battery

voltage is.

Battery Over-Voltage Protection

The MP2633A has battery over-voltage

protection. If the battery voltage exceeds the

battery over-voltage threshold, (103.3% of the

battery-full voltage), charging is disabled. Under

this condition, an internal current source draws a

current from the BATT pin to decrease the

battery voltage and protect the battery.

Timer Operation in Charge Mode

The MP2633A 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.

Auto-Recharge

Once the battery charge cycle completes, the

charger remains off. During this process, the

system load may consume battery power, or the

battery may self discharge. To ensure that the

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23

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

If charging remains in TC mode beyond the

trickle-charge time τ_{TOTAL_TMR}charging will

terminate. The following determines the length of

the trickle-charge period:

120µs blanking time, Q2 will turn off. A fast off

function turns off Q2 quickly when the input

current exceeds 7A to protect both Q1 and Q2.

,

Setting the Charge Current

The external sense resistors, RS1 and R_ISET

program the battery charge current, I_CHG. Select

_ISETbased on RS1:

,

C_TMR(F)

0.1F

1A

(1)

(2)

_{TRICKLE _ TMR} 60mins



I_CHG(A)

R

The maximum total charge time is:

70(kꢀ)

40(mV)

I_CHG(A)=



(4)

R_ISET(kꢀ) RS1(mꢀ)

C_TMR(F)

0.1F

1A

Where the 40mV is the charge current limit

reference. R_ISETcan not be larger than 70k

always.

_{TOTAL _ TMR} 6Hours



I_CHG(A)

Negative Temperature Coefficient (NTC) Input

for Battery Temperature Monitoring

Battery Short Protection

The MP2633A has two current limit thresholds.

CC and CV modes have a peak current limit

threshold of 3A, while TC mode has a current

limit threshold of 1.5A. Therefore, the current limit

threshold decreases to 1.5A when the battery

voltage drops below the TC threshold. Moreover,

the switching frequency also decreases when the

BATT voltage drops to 40% of the charge-full

voltage.

The MP2633A has a built-in NTC resistance

window comparator, which allows the MP2633A

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

MP2633A stops charging. The charger will then

restart if the temperature goes back into NTC

window range.

Thermal Foldback Function

The MP2633A implements thermal protection to

prevent thermal damage to the IC and the

surrounding components. An internal thermal

sense and feedback loop automatically

decreases the programmed charge current when

the die temperature reaches 120°C. This function

is called the charge-current-thermal foldback. Not

only does this function protect 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 150°C.

Input-Current Limiting in Charge Mode

The MP2633A has a dedicated pin that programs

the input-current limit. The current at ILIM is a

fraction of the input current; the voltage at ILIM

indicates the average input current of the

switching regulator as determined by the resistor

value between ILIM and GND. As the input

current approaches the programmed input

current limit, charge current is reduced to allow

priority to system power.

Use the following equation to determine the input

current limit threshold,

Fully Operation Indication

40.5(kꢀ)

I =

(A)

(3)

The MP2633A integrates indicators for the

following conditions as shown in Table 2.

ILIM

R_ILIM(kꢀ)

Input Over-Current Protection

The MP2633A features input over-current

protection (OCP): when the input current

exceeds 3A, Q2 is controlled linearly to regulate

the current. If the current still exceeds 3A after a

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24

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

Table 2: Indicator for Each Operation Mode

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

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

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

Operation

ACOK

CHG

BOOST

Charging

Low

Charge Mode

Boost Mode

Low

High

End of Charge, charging disabled

NTC Fault, Timer Out

High

Blinking

High

Low

Sleep Mode, VCC absent

High

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. Should output over-voltage occur,

the MP2633A turns off the boost converter. Once

V_SYSdrops to a normal level, the boost converter

restarts again as long as the MODE pin remains

in active status.

BOOST MODE OPERATION

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 MP2633A 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

.

Boost Output-Current Limiting

When the voltage across C_DSexceeds V_BATT, the

synchronous P-MOSFET enters a linear mode

allowing the inductor current to decrease and

flowing into the SYS pin. Once V_SYSexceeds

The MP2633A integrates a programmable output

current limit function in boost mode. If the boost

output current exceeds this programmable limit

threshold, the output current will be limited at this

level and the SYS voltage will start to drop down.

The OLIM pin programs the current limit

threshold up to 1A as per the following equation:

V_BATT, the P-MOSFET gate is released and

normal closed-loop PWM operation is initiated. In

boost mode, the battery voltage can drop to as

low as 2.5V without affecting circuit operation.

70(kꢀ)

40(mV)

(5)

SYS Disconnect and Inrush Limiting

I_OLIM(A)=



R_OLIM(kꢀ) RS1(mꢀ)

The MP2633A allows for true output disconnect

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 benefits of

output disconnect, avoid connecting an external

Schottky diode between the SW and SYS pins.

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.

Where the 40mV is the charge current limiting

reference.

SYS Output Over Current Protection

The MP2633A integrates three-phase output

over-current protection.

Phase one (boost mode): when the output

current exceeds the 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.

Phase two (down mode): when V_SYSdrops below

_BATT+100mV and the output current loop

V

remains in control, the boost converter enters

down mode and shutdown after a 120μs blanking

time.

Boost Output Voltage

The MP2633A programs the output voltage via

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MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

Phase three (short circuit mode): when V_SYS

drops below 2V, 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 500µs deglitch period.

Thermal Shutdown Protection

Thermal shutdown protection is also active in

boost mode. Once the junction temperature rises

higher than 150°C, the MP2633A enters thermal

shutdown. It will not resume normal operation

until the junction temperature drops below 120°C

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MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

APPLICATION INFORMATION

R6

COMPONENT SELECTION

(10)

V_PWIN V 

(V)

IN

R4  R6

Setting the Charge Current in Charge Mode

If the voltage on PWIN is between 0.8V and

1.15V, the MP2633A works in the charge mode.

While the voltage on the PWIN pin is not in the

range of 0.8V to 1.15V and VIN > 2V, the

MP2633A works in the boost mode (see Table 1).

In charge mode, both the external sense resistor,

RS1, and the resistor R_ISETconnect to the ISET

pin to set the charge current (I^CHG) of the

MP2633A (see the Typical Application circuit).

Given I_CHGand RS1, the regulation threshold,

For a wide operating range, use a maximum

input voltage of 6V as the upper threshold for a

voltage ratio of:

V_IREF, across this resistor is:

(6)

(7)

V

_IREF(mV)  RS1(m)I_CHG(A)

V_PWIN

1.15

6

R6

(11)

R_ISETsets V_IREFas per the following equation:



V

R4 R6

IN

70(k)

V

_IREF(mV) 

 40(mV)

With the given R6, R4 is then:

R_ISET(k)

V  V_PWIN

IN

So, the R_ISETcan be calculated as:

(12)

R4 

R6

V_PWIN

70(k)

(8)

R_ISET(k) 

 40(mV)

Consider these resistors as the dummy load at

the input port. Use resistors in the hundreds of

ohms range to shorten the power-off time. For a

typical application, start with R6=51ꢀ, R4 is

215ꢀ.

V_IREF(mV)

For example, for I^CHG=1.5A and RS1=50mꢀ:

_IREF=75mV, so R_ISET=37.4kꢀ.

V

Setting the Input Current Limiting in Charge

Mode

REG Voltage Setting

REG pin is the feedback input of the input

voltage. Connect this pin to external resistor

divider from VIN to GND. The voltage on this pin

should be always higher than 1.2V when normal

operation.

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:

40.5

R5

R_ILIM



(k)

(9)

(13)

V_REG



 V

 1.2V

IN_MIN

I_{IN_LIM}(A)

R3 R5

Where R_ILIMmust exceed 20kꢀ so that IIN_LIM is in

the range of 0A to 2A.

Consider these resistors as the dummy load at

the input port. Use resistors in the hundreds of

ohms range to shorten the power-off time. If

VIN_MIN=4.25V, given R5=51ꢀ, R3=127ꢀ.

For most applications, use R_ILIM= 45kꢀ

(I_{USB_LIM}=900mA) for USB3.0, and use an R_{LIM =}

81kꢀ (I_{USB_LIM}=500mA) for USB2.0.

NTC Function in Charge Mode

Setting the Input Voltage Range for Different

Operation Modes

Figure 12 shows that an internal resistor divider

sets the low temperature threshold (V_TL) and high

temperature threshold (V_TH) at 65%·V_SYSand

A resistive voltage divider from the input voltage

to PWIN pin determines the operating mode of

MP2633A.

35%·V_SYS

,

respectively. For

a

given NTC

thermistor, select an appropriate R_T1and R_T2to

set the NTC window.

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MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

regulated to the value customer required

R_T2//R_{NTC_Cold}

V

TL

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

pin as R1 and R2 in the typical application circuit.

R1R2

(14)

(15)



 TL 65%

V

R_T1R_T2//R_{NTC_Cold}

SYS

(18)

V_SYS1.2V

R_T2//R_{NTC_Hot}

V_TH

R2



 TH  35%

V_SYSR_T1 R_T2//R_{NTC_Hot}

Where, 1.2V is the voltage reference of SYS.

With a typical value for R2, 10kꢀ, R1 can be

determined by:

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.

V_SYS1.2V

(19)

R1

R2

1.2V

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

10kꢀ, and R1 is 31.6kꢀ.

The two resistors, R_T1and R_T2, independently

determine the upper and lower temperature limits.

This flexibility allows the MP2633A to operate

with most NTC resistors for different temperature

range requirements. Calculate R_T1and R_T2as

follows:

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:

R_{NTC_Hot}R_{NTC_Cold}(TL  TH)

(16)

R_T1



TH TL (R_{NTC_Cold} R_{NTC_Hot}

)

70(k) 40(mV)

I_OLIM(A) RS1(m)

(TLTH)R_{NTC_Cold}R_{NTC_Hot}

(1TL)THR_{NTC_Cold}-(1-TH)TLR_{NTC_Hot}

(17)

(20)

R_OLIM(k) 

R_T2



Where R_OLIMis greater than 56kꢀ, so I_OLIMcan be

programmed up to 1A.

For example, the NCP18XH103 thermistor has

the following electrical characteristic:

Selecting the Inductor

At 0°C, R_{NTC_Cold}= 27.445kꢀ;

At 50°C, R_{NTC_Hot}= 4.1601kꢀ.

Inductor selection trades off between cost, size,

and efficiency.

A

lower inductance value

corresponds with smaller size, but results in

higher ripple currents, 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.

Based on equation (16) and equation (17),

R^T1=6.47kꢀ and RT2 = 21.35kꢀ are suitable for

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

approximate values: e.g., R_T1=6.49kꢀ and

R_T2=21.5kꢀ.

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= 10kꢀ.

Choose an inductor that does not saturate under

the worst-case load condition.

SYS

1. Charge Mode

When MP2633A works in charge mode (as a

buck converter), estimate the required

inductance as:

Low Temp Threshold

R_T1

V_TL

NTC

V  V_BATT

I_{L _MAX}

V_BATT

IN

R_NTC

R_T2

(21)

L 



V  f_S

IN

High Temp Threshold

V_TH

Figure 12: NTC Function Block

Setting the System Voltage in Boost Mode

In the boost mode, the system voltage can be

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MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

noise from the device. The input capacitor

Where V_IN, V_BATT, and f_Sare the typical input

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 X5R or X7R dielectrics because

of their low ESR and small temperature

coefficients. For most applications, a 22µF

capacitor will suffice.

voltage, the CC charge threshold, and the

switching frequency, respectively. ∆I_{L_MAX}is

the maximum inductor ripple current, which is

usually designed at 30% of the CC charge

current.

With a typical 5V input voltage, 30% inductor

current ripple at the corner point between

trickle charge and CC charge (V_BATT=3V), the

inductance is 1.85μH (for a 1.2MHz switching

Selecting the System Capacitor, C_SYS

Select C_SYSbased on the demand of the system

current ripple.

frequency), and 3.7µH (for

switching frequency).

a

600kHz

1. Charge Mode

2. Boost Mode

The capacitor C_SYSacts as the input capacitor

of the buck converter in charge mode. The

input current ripple is:

When the MP2633A is in boost mode (as a

boost converter), the required inductance

value is calculated as:

V_BATT(V_SYS V_BATT

V_SYS f_S I_{L _MAX}

)

V_TC(V_{IN_MAX} V_TC)

(22)

L 

(25)

I_{RMS _MAX} I_{SYS _MAX}



V_{IN_MAX}

(23)

(24)

I_{L _MAX} (30%  40%)I_BATT(MAX)

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:

V_SYSI_SYS

I_BATT(MAX)



V_BATT 

Where V_BATTis the minimum battery voltage,

_SWis the switching frequency, and ꢁI_{L_MAX}is

f

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.

V_TC(V_{SYS _MAX} V_TC)

(26)

I_{RMS _MAX} I_{SYS _MAX}



V_{SYS _MAX}

Since the input voltage passes to the system

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

boost mode have the same system current ripple.

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 1.8μH (for a 1.2MHz switching

frequency) and 3.6µH (for a 600kHz switching

frequency) when the efficiency is 90%.

For I_{CC_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 X5R or X7R dielectrics

with low ESR and small temperature coefficients.

For most applications, use a 22µF capacitor.

For best results, use an inductor with an

inductance of 1.8μH (for a 1.2MHz switching

frequency) and 3.6µH (for a 600kHz switching

frequency) with a DC current rating that is at

least 30% higher than the maximum charge

current for applications. For higher efficiency,

minimize the inductor’s DC resistance.

Selecting the Battery Capacitor, C_BATT

C_BATTis in parallel with the battery to absorb the

high-frequency switching ripple current.

Selecting the Input Capacitor, C_IN

The input capacitor C_INreduces both the surge

current drawn from the input and the switching

MP2633A Rev. 1.03

4/27/2016

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29

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

1. Charge Mode

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.

The capacitor C_BATTis the output capacitor of

the buck converter. The output voltage ripple

is then:

Place the output inductor close to the IC and

connect the output capacitor between the

inductor and PGND of the IC.

V_BATT

V_BATT

1 V_BATT/ V_SYS

8C_BATT f_S²L

(27)

r_BATT



2) For high-current applications, the power pads

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

connected to as many copper planes on the

board as possible. The exposed pad should

connect to as many GND copper planes in the

board as possible. This improves thermal

performance because the board conducts heat

away from the IC.

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 (27).

Both charge mode and boost mode have the

same battery voltage ripple. The capacitor C_BATT

can be calculated as:

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). If possible, add vias

inside the exposed pads for the IC. 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.

1 V_TC/ V_{SYS _MAX}

(28)

C_BATT



8 r_{BATT _MAX} f_S²L

To guarantee the ±0.5% BATT voltage accuracy,

the maximum BATT voltage ripple must not

exceed 0.5% (e.g., 0.1%). The worst case occurs

at the minimum battery voltage of the CC charge

with the maximum input voltage.

For V_{SYS_MAX}=6V, V_{CC_MIN}=V_TC=3V, L=3.9µH,

f_S=600kHz or 1.2MHz,

, C

is

r_{BATT _MAX} 0.1%

BATT

4) Place ISET, OLIM and ILIM resistors very

close to their respective IC pins.

22µF (for a 600kHz switching frequency) or 10µF

(for a 1.2MHz switching frequency).

A 22µF ceramic with X5R or X7R dielectrics

capacitor in parallel with a 220uF electrolytic

capacitor will suffice.

PCB Layout Guide

PCB layout is very important to meet specified

noise, efficiency and stability requirements. The

following design considerations can improve

circuit performance:

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 and the current sense resistor trace.

Keep the switching node short and away from all

small control signals, especially the feedback

network.

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

30

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

Design Example

Below is a design example following the

application guidelines for the specifications:

Table 3: Design Example

V_IN

V_OUT

f_SW

5V

3.7V

1200kHz

Figure14 shows the detailed application

schematic. The Typical Performance

Characteristics section shows the typical

performance and circuit waveforms. For more

possible applications of this device, please refer

to the related Evaluation Board datasheets.

Top Layer

Bottom Layer

Figure 13 PCB Layout Guide

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

31

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

SYS

R1

R2

C7

31.6k 1%

10k 1%

C2

C8

CSYS

ROLM

PGND

47pF

56k 1%

VIN

FB

VIN

C5

RL

RH

RS1

50m

CIN

C1

U1

SW 1

VBATT

51

215

R3

BATT

L1

R4

2

7

5

20

C3 CBATT

PGND

VCC

VIN

SW

C6

51

110

16

15

10

CSP

BATT

NTC

REG

PWIN

VCC

NTC

SYS

R6

R7

10k

R8

10k

C4

SYS

RT2

JP4

10k

RT1 10k

10k

2

VCC

MP2633A

14

18

8

VB

CHG

R5

VCC

3

1

JP3

JP1

JP2

VCC

FREQ

EN

LED1

2k

R9

ACOK

BOOST

ISET

LED2

LED3

R10

24

23

4

17

11

6

LED

JP5

2k R11

MODE

ILIM

VBATT

RISET

TMR

CTMR

100nF

RILIM

AGND

Figure14: Detailed Application Circuit

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

32

MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

PACKAGE INFORMATION

QFN24 (4x4mm)

3.90

4.10

2.50

2.80

PIN 1 ID

SEE DETAIL A

19

24

PIN 1 ID

MARKING

18

1

6

0.50

BSC

3.90

4.10

2.50

2.80

PIN 1 ID

INDEX AREA

0.18

0.30

13

12

7

0.35

0.45

TOP VIEW

BOTTOM VIEW

PIN 1 ID OPTION A

0.30x45º TYP.

PIN 1 ID OPTION B

R0.25 TYP.

0.80

1.00

0.20 REF

0.00

0.05

DETAIL A

SIDE VIEW

3.90

2.70

NOTE:

1) ALL DIMENSIONS ARE IN MILLIMETERS.

2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.

3) LEAD COPLANARITY SHALL BE0.10 MILLIMETER MAX.

4) DRAWING CONFIRMS TO JEDEC MO-220, VARIATION VGGD.

5) DRAWING IS NOT TO SCALE.

0.70

0.25

0.50

RECOMMENDED LAND PATTERN

NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.

Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS

products into any application. MPS will not assume any legal responsibility for any said applications.

MP2633A Rev. 1.03

4/27/2016

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

33


型号：	MP2633A
厂家：	MONOLITHIC POWER SYSTEMS
描述：	1.5A Single Cell Switch Mode Battery Charger with Power Path Management and Boost OTG 电池
文件：	总33页 (文件大小：1431K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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