MP2633GR_技术文档

MP2633

1.5A Single Cell Switch Mode Battery Charger

with Power Path Management and Boost OTG

The Future of Analog IC Technology

DESCRIPTION

FEATURES

The MP2633 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

Power Management Function Integrated

Input-Current Limit and Input-Voltage

Regulation

Up to 1.5A Programmable Charge Current

Trickle-Charge Function

•

The MP2633 has two operating modes—charge

mode and boost mode—to allow management

of system and battery power based on the state

of the input.

Selectable 3.6V/ 4.2V Charge Voltage with

0.5% Accuracy

•

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 both

input-current limit and input-voltage regulation

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 MP2633

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 MP2633 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 MP2633 provides full operating status

indication to distinguish charge mode from

boost mode.

The

MP2633

achieves

low

EMI/EMC

performance with well-controlled switching

edges.

To guarantee safe operation, the MP2633 limits

the die temperature to a preset value 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.

MP2633 Rev. 1.05

4/19/2013

www.MonolithicPower.com

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

1

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

TYPICAL APPLICATION

Table 1: Operation Mode

__________

Power Source

EN

High

Low

X

MODE Operating Mode

ACOK

Charge Mode, Enable Charging

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

Low

X

Charge Mode, Disable Charging

Boost Mode

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.

MP2633 Rev. 1.05

4/19/2013

www.MonolithicPower.com

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

2

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

ORDERING INFORMATION

Part Number*

Package

Top Marking

MP2633GR

QFN24 (4×4mm)

M2633E

* For Tape & Reel, add suffix –Z (e.g. MP2633GR–Z);

PACKAGE REFERENCE

TOP VIEW

ABSOLUTE MAXIMUM RATINGS ⁽¹⁾

Thermal Resistance ⁽⁴⁾

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

θ_JA

θ_JC

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

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

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

MP2633 Rev. 1.05

4/19/2013

www.MonolithicPower.com

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3

MP2633 – 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

4

A

High-Side PMOS Peak Current

Limit

I_{PEAK_HS}

TC Charge Mode

1.5

4.5

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}

mA

R_lLIM= 49.9k

R

_lLIM= 20k

1800

Input Over-Current Threshold

I_IN(OCP)

A

Input Over-Current Blanking

Time⁽⁵⁾

τ_INOCBLK

120

µs

Input Over-Current Recovery

Time⁽⁵⁾

τ_INRECVR

100

3.6

ms

V

Connect VB to GND

3.582

4.179

3.39

3.618

4.221

3.49

Terminal Battery Voltage

Recharge Threshold

V_{BATT_FULL}

Leave VB floating or

connect to logic HIGH

4.2

Connect to VB to GND

3.44

4.01

V_RECH

Leave VB floating or

connect to logic HIGH

3.95

4.07

V

Recharge Threshold Hysteresis

Battery Over Voltage Threshold

200

103.3%

1000

1500

230

mV

V_{BATT_FULL}

RS1 = 40mΩ, R_ISET= 69.8k

900

1100

1650

Constant Charge (CC) Current

Trickle-Charge Current

I_CC

I_TC

mA

RS1 = 40mΩ, R_ISET= 46.4k 1350

MP2633 Rev. 1.05

4/19/2013

www.MonolithicPower.com

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4

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

ELECTRICAL CHARACTERISTICS (continued)

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

Parameter

Symbol Condition

Connect to VB to GND

Min

Typ

Max

Units

2.47

2.57

2.67

Trickle-Charge Voltage

Threshold

V_{BATT_TC}

V

Leave VB floating or connect

to high logic

2.9

3

3.1

Trickle-Charge Hysteresis

Termination Charge Current

200

mV

I_CC

I_BF

RS1=40m, R_ISET=69.8k

2.5%

1.18

10%

17.5%

1.22

Input-Voltage-Regulation

Reference

V_REG

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

Programmable Boost Output

Current Limit Accuracy

I_OLIM

RS1 = 40mΩ, R_OLIM= 100k

1

1.2

1.44

Programmable Boost Output

Current⁽⁵⁾

RS1 = 50mΩ, ROLIM=63.4k

1.5

A

SYS Over-Current Blanking

Time⁽⁵⁾

τ_SYSOCBLK

τ_SYSRECVR

V_BATT(LOW)

120

1

µs

ms

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, V_IN

Battery Leakage Current

I_LEAKAGE

15

μA

= 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

MP2633 Rev. 1.05

4/19/2013

www.MonolithicPower.com

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5

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

ELECTRICAL CHARACTERISTICS (continued)

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)

Charge Mode

NTC High Temp, Rising

Threshold Hysteresis

Charging Current Fold-back

120

150

°C

Threshold⁽⁵⁾

Thermal Shutdown Threshold⁽⁵⁾

Notes:

5) Guaranteed by design.

MP2633 Rev. 1.05

4/19/2013

www.MonolithicPower.com

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6

MP2633 – 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.

Charge Current vs.

RISET,Charge Mode

Charge Current vs.

Temeprature, Charge Mode

V

=5V, V

=4.2V,

V

=5V, V

=3.7V, I =1.5A

CHG

=4.2V,

IN

BATT_FULL

IN

BATT

BATT_FULL

=3.7V, F =1.2MHz

BATT

SW

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

R_SET(k)

INPUT VOLTAGE (V)

V

@ Charge Mode

V

@ Boost Mode

CC

Switching Frequency vs.

CC

Battery Voltage, Charge Mode

V

=5V, V

=4.2V, I

=2A

IN

BATT_FULL

CHG

1200

1000

800

8

7

1200k & 3.6V full

6

5

4

3

2

V

CC

=SYS

V

CC

=SYS

6

5

4

3

2

1200k & 4.2V full

600

400

200

0

1

0

1

0

2

4

6

8

10

1

3

5

7

0

0.5

1

1.5

2

2.5

INPUT VOLTAGE (V)

BATTERY VOLTAGE (V)

Input Current Limit Setting

(Iin_lim vs. RILIM)

Programmable Output

Current Limit

(OLIM vs. ROLIM)

BATT=4.2V

Programmable Output

Current Limit

vs. Battery Voltage

R

=73.2k, SYS=5V

OLIM

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

3

2.5

2

1.5

1

0.5

0

50

100

30

80 130 180 230 280

1.2 1.22 1.24 1.26 1.28

BOOST CURRENT LIMIT (A)

1.3

MP2633 Rev. 1.05

4/19/2013

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7

MP2633 – 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)

MP2633 Rev. 1.05

4/19/2013

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8

MP2633 – 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.

Power On, Charge Mode

Power Off, Charge Mode

En On, Charge Mode

V

=4.2V, V

=3.7V,

V

=4.2V, V

=3.7V,

V

=4.2V, V =3.7V,

BATT_FULL BATT

I

=1.5A

I

=1.5A

I

=1.5A

CHG

EN

5V/div.

V

IN

2V/div.

SYS

2V/div.

V

SYS

2V/div.

V

SYS

2V/div.

V

BATT

2V/div.

I

L

I

1A/div.

L

500mA/div.

En Off, Charge Mode

Input Current Limit

V

=4.2V, V

=3.7V,

V

=4.2V, V =3.7V,

BATT_FULL BATT

I

=1.5A

I

=1.5A

CHG

V

EN

5V/div.

V

SYS

2V/div.

V

SYS

I

IN

2V/div.

V

SYS

1A/div.

2V/div.

V

I

BATT

SYS

V

BATT

1A/div.

1V/div.

2V/div.

V

I

IN

CHG

L

2V/div.

1A/div.

System Short Protection

Zoom In

Input Voltage Clamp @ 4.75V

Charge Mode

V

=4.2V, V =2V,

BATT_FULL BATT

F

=600kHz

SW

V

=4.2V, V

=2V,

V

=4.75V, V

=4.2V,

BATT_FULL

=600kHz

BATT

IN_regulation

F

V

=3.7V, I

=1.5A, Increase Isys

SW

BATT CHG

4.75V

V

SYS

V

I

SYS

BATT

1V/div.

500mA/div.

I

SYS

V

IN

V

500mA/div.

IN

1V/div.

V

IN

1V/div.

V

BATT

V

1V/div.

BATT

1V/div.

I

SYS

I

SYS

2A/div.

V

BATT

2V/div.

2A/div.

MP2633 Rev. 1.05

4/19/2013

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9

MP2633 – 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.

MP2633 Rev. 1.05

4/19/2013

www.MonolithicPower.com

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

10

MP2633 – 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.

SYS short Entry

Boost Mode

SYS Short Recovery

Boost Mode

SYS Over Voltage Protection,

Boost Mode

V

=5V, V

=3.7V

V

=5V, V

=3.7V

V

=6.5V, V =3.7V

BATT

SYS_SET

BATT

SYS_SET

BATT

SYS_SET

V

BATT

V

BATT

2V/div.

V

2V/div.

BATT

2V/div.

V

SYS

2V/div.

V

SYS

2V/div.

I

BOOST

2V/div.

I

L

1A/div.

SYS Load Transient,

Boost Mode

SYS Load Transient,

Boost Mode

SYS Short Steady State

Boost Mode

V

=5V, V =3.7V

BATT

V

=5V, V

=3.7V,

V

=5V, V =3.7V,

SYS_SET

BATT

SYS_SET

BATT

I

= 100mA to 1A

I

= 500mA to 1A

SYS

V

BATT

2V/div.

V

/AC

SYS

V

/AC

SYS

200mV/div.

V

SYS

V

2V/div.

BATT

1V/div.

I

SYS

500mA/div.

SYS

500mA/div.

I

L

1A/div.

Efficiency, Boost Mode

Boost Output V-I Curve

BATT=3.7V, SYS=5V

V

=5V, V

SYS

=5V,

V

=5V, V

=5V,

SYS_SET

=1.2MHz

SYS_SET

=600kHz

SYS

F

SW

6

100

90

80

70

60

50

40

30

90

80

70

60

50

40

30

5

4

3

2

1

0

V

=4.2V

V

=4.2V

V =3.7V

BATT

V

=3.7V

BATT

V

=2.9V

BATT

V

=2.9V

BATT

0

0.25

0.5

0.75

1

0

0.25

0.5

0.75

1

0

0.5

1

1.5

SYSTEM CURRENT (A)

MP2633 Rev. 1.05

4/19/2013

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11

MP2633 – 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

CANNOT carry any load.

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 for 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.

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)

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12

MP2633 – 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

EN

GMT

T_J

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

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13

MP2633 – 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

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14

MP2633 – 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

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15

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

OPERATION FLOW CHART (continued)

Figure 4: Normal Operation and Fault Protection in Charge Mode

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16

MP2633 – 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

MP2633 – 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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18

MP2633 – 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 > V_BATT+ 300mV

IN

5V

0V

EN

Mode

V_CC

V_CCfollowsV

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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19

MP2633 – 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

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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20

MP2633 – 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

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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21

MP2633 – 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

V_CC

5V

0V

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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22

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

OPERATION

battery will not go into depletion, a new charge

cycle automatically begins when the battery

INTRODUCTION

The MP2633 is a highly-integrated, 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 MP2633 supports a precision

Li-ion or Li-polymer charging system for single-

cell applications. In boost mode, MP2633 boosts

the battery voltage to V_SYSto power higher-

voltage systems. In sleep mode, the MP2633

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 MP2633 monitors VIN to allow smooth

transition between different modes of operation.

CC>>>CV

Threshold

Constant

Charge

Current

I_CHG

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

CHARGE MODE OPERATION

Trickle charge CC charge

CV charge Charge Full

Charge Cycle (Trickle ChargeÆCC

ChargeÆCV Charge)

b) With input current limit

In charge mode, the MP2633 has five control

loops to regulate the input current, input voltage,

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.

Figure 11: Typical Battery Charginge Profile

voltage falls below the auto-recharge threshold

and the input power is present. The timer resets

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 reset no matter what the battery

voltage is.

Battery Over-Voltage Protection

The MP2633 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 MP2633 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

MP2633 – 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:

In charge mode, if the input power source is not

sufficient to support both the charge current and

system load current, the input voltage will

decrease. As the input voltage approaches the

programmed input voltage regulation value,

charge current is reduced to allow priority of

system power and maintain the input voltage

avoid dropping further.

,

C_TMR(μF)

0.1μF

1A

τ_{TRICKLE_ TMR}= 60mins×

×

(1)

I_CHG(A)

The maximum total charge time is:

C_TMR(μF)

1A

τ_{TOTAL _ TMR}= 6Hours ×

×

(2)

The input voltage can be regulated by a resistor

divider from VIN pin to REG pin to AGND

according to the following expression:

0.1μF

I_CHG(A)

Negative Temperature Coefficient (NTC) Input

for Battery Temperature Monitoring

R3 + R5

(4)

V

= V_REG×

IN_R

The MP2633 has a built-in NTC resistance

window comparator, which allows the MP2633 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 MP2633

stops charging. The charger will then restart if the

temperature goes back into NTC window range.

R5

Where: the VREG is the internal voltage

reference, 1.2V.

Setting the Charge Current

The external sense resistors, RS1 and R_ISET

,

program the battery charge current, I_CHG. Select

R_ISETbased on RS1:

70(kΩ)

40(mV)

I_CHG(A)=

×

(5)

R_ISET(kΩ) RS1(mΩ)

Where: the 40mV is the charge current limit

reference.

Input-Current Limiting in Charge Mode

The MP2633 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.

Battery Short Protection

The MP2633 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.

Use the following equation to determine the input

current limit threshold,

Thermal Foldback Function

40.5(kΩ)

I

=

(A)

(3)

ILIM

The MP2633 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

R_ILIM(kΩ)

Input Over-Current Protection

The MP2633 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

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.

Input Voltage Regulation in Charge Mode

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24

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

on requirements rather than worst-case

Fully Operation Indication

conditions while ensuring safe operation.

Furthermore, the part includes thermal shutdown

protection where the ceases charging if the

junction temperature rises to 150°C.

The MP2633 integrates indicators for the

following conditions as shown in Table 2.

Table 2: Indicator for Each Operation Mode

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

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

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

Operation

ACOK

CHG

BOOST

Charging

Low

End of Charge, charging disabled

NTC Fault, Timer Out

High

Charge Mode

Boost Mode

Low

High

Blinking

High

Low

Sleep Mode, VCC absent

High

low ESR/ESL ceramic capacitors tied to a good

ground plane.

BOOST MODE OPERATION

Low-Voltage Start-Up

Boost Output Voltage

The minimum battery voltage required to start up

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

V_SYS< V_BATT, the MP2633 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

In the boost mode, the MP2633 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. Should output over-voltage occur,

the MP2633 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.

across the parasitic C_DS(V_SW) is lower than V_BATT

.

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

V_BATT, the P-MOSFET gate is released and

Boost Output-Current Limiting

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.

The MP2633 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 1.5A as per the following

equation:

SYS Disconnect and Inrush Limiting

The MP2633 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

70(kΩ)

R_OLIM(kΩ) RS1((mΩ)

40(mV)

(6)

I_OLIM(A) =

×

×1.7

Where: the 40mV is the charge current limiting

reference.

SYS Output Over Current Protection

The MP2633 integrates three-phase output over-

current protection.

Phase one (boost mode): when the output

current exceeds the output current limit, the

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25

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

output constant current loop controls the output

current, the output current remains at its limit of

_OLIM, and V_SYSdecreases.

I

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.

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 1ms deglitch period.

Thermal Shutdown Protection

Thermal shutdown protection is also active in

boost mode. Once the junction temperature rises

higher than 150°C, the MP2633 enters thermal

shutdown. It will not resume normal operation

until the junction temperature drops below 120°C.

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26

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

APPLICATION INFORMATION

If the voltage on PWIN is between 0.8V and

1.15V, the MP2633 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

MP2633 works in the boost mode (see MPS. All

Rights Reserved.).

For a wide operating range, use a maximum

input voltage of 6V as the upper threshold for a

voltage ratio of:

COMPONENT SELECTION

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

MP2633 (see the Typical Application circuit).

Given I_CHGand RS1, the regulation threshold,

V_IREF, across this resistor is:

V_PWIN

1.15

6

R6

(7)

V

_IREF(mV) = RS1(mΩ)×I_CHG(A)

(12)

=

V

R4 + R6

IN

R_ISETsets V_IREFas per the following equation:

With the given R6, R4 is then:

70(kΩ)

R_ISET(kΩ)

(8)

V

_IREF(mV) =

× 40(mV)

V − V_PWIN

IN

(13)

R4 =

×R6

V_PWIN

So, the R_ISETcan be calculated as:

For a typical application, start with R6=5.1kꢀ, R4

is 21.5kꢀ.

70(kΩ)

(9)

R_ISET(kΩ) =

× 40(mV)

V_IREF(mV)

Setting the Input Voltage Regulation in

Charge Mode

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

_IREF=75mV, so R_ISET=37.4kꢀ.

V

In charge mode, connect a resistor divider from the

VIN pin to AGND with tapped to REG pin to program

the input voltage regulation.

Setting the Input Current Limiting in Charge

Mode

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:

R3 + R5

(14)

V

= V_REG×

IN_R

R5

With the given R5, R3 is:

V

− V_RGE

40.5

IN_R

(15)

R3 =

×R5

R_ILIM

=

(kΩ)

(10)

V_REG

I_{IN_LIM}(A)

Where R_ILIMmust exceed 20kꢀ so that IIN_LIM is

in the range of 0A to 2A.

For a preset input voltage regulation value, say

4.75V, start with R5=5.1kꢀ, R3 is 15kꢀ.

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

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

Setting the Input Voltage Range for Different

Operation Modes

A resistive voltage divider from the input

voltage to PWIN pin determines the

operating mode of MP2633.

35%·V_SYS

,

respectively. For

a

given NTC

thermistor, select an appropriate RT1 and RT2 to

set the NTC window.

R_T2//R_{NTC_Cold}

V

TL

(16)

=

= TL= 65%

V

R_T1+R_T2//R_{NTC_Cold}

R6

SYS

(11)

V_PWIN= V ×

(V)

IN

R4 + R6

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27

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

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

pin as R1 and R2 in the typical application circuit.

R_T2//R_{NTC_Hot}

V_SYSR_T1+ R_T2//R_{NTC_Hot}

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_TH

(17)

=

= TH = 35%

R1+ R2

V_SYS= 1.2V ×

(20)

R2

Where 1.2V is the voltage reference of SYS. With

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

determined by:

The two resistors, R_T1and R_T2, independently

determine the upper and lower temperature limits.

This flexibility allows the MP2633 to operate with

most of NTC resistors for different temperature

range requirements. Calculate R_T1and R_T2as

follows:

V_SYS−1.2V

R1= R2×

(V)

(21)

1.2V

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

10kꢀ, and R1 is 31.6kꢀ.

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)

(18)

R_T1

=

TH× TL ×(R_{NTC_Cold}− R_{NTC_Hot}

)

(TL−TH)×R_{NTC_Cold}×R_{NTC_Hot}

(1−TL)×TH×R_{NTC_Cold}-(1-TH)×TL×R_{NTC_Hot}

(19)

R_T2

=

70(kΩ)× 40(mV)

I_OLIM(A)× RS1(mΩ)

For example, the NCP18XH103 thermistor has

the following electrical characteristic:

(22)

R_OLIM(kΩ) =

×1.7

Where R_OLIMis greater than 63.4kꢀ, so I_OLIMcan

be programmed up to 1.5A.

At 0°C, R_{NTC_Cold}= 27.445kꢀ;

At 50°C, R_{NTC_Hot}= 4.1601kꢀ.

Selecting the Inductor

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

RT1=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.

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.

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.

SYS

Choose an inductor that does not saturate under

the worst-case load condition.

Low Temp Threshold

R_T1

V_TL

1. Charge Mode

NTC

When MP2633 works in charge mode (as a

buck converter), estimate the required

inductance as:

R_NTC

R_T2

V_IN− V_BATT

ΔI_{L _MAX}

V_BATT

High Temp Threshold

V_TH

(23)

L =

×

V_IN× f_S

Figure 12: NTC Function Block

Where V_IN, V_BATT, and f_Sare the typical input

Setting the System Voltage in Boost Mode

In the boost mode, the system voltage can be

regulated to the value customer required

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28

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

noise from the device. The input capacitor

voltage, the CC charge threshold, and the

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.

switching frequency, respectively. ΔI_{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

frequency), and 3.7µH (for

switching frequency).

a

600kHz

Select C_SYSbased on the demand of the system

current ripple.

2. Boost Mode

1. Charge Mode

When the MP2633 is in boost mode (as a

boost converter), the required inductance

value is calculated as:

The capacitor C_SYSacts as the input capacitor of

the buck converter in charge mode. The input

current ripple is:

V_BATT×(V_SYS− V_BATT

V_SYS× f_S× ΔI_{L _MAX}

)

(24)

L =

V_TC×(V_{IN_MAX}− V_TC)

(27)

I_{RMS _MAX}= I_{SYS _MAX}

×

V_{IN_MAX}

(25)

(26)

ΔI_{L _MAX}= (30% − 40%)×I_BATT(MAX)

V_SYS×I_SYS

2. Boost Mode

I_BATT(MAX)

=

V_BATT× η

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:

Where V_BATTis the minimum battery voltage,

f

_SWis 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.

V_TC×(V_{SYS _MAX}− V_TC)

(28)

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 the 1.2MHz

switching frequency) and 3.6µH (for the

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 the 1.2MHz

switching frequency) and 3.6µH (for the

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.

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

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29

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

inductor and PGND of the IC.

ΔV_BATT

V_BATT

1− V_BATT/ V_SYS

(29)

Δr_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.

8×C_BATT× f_S²×L

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 (29).

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}

8× Δr_{BATT _MAX}× f_S²×L

(30)

C_BATT

=

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.

4) Place ISET, OLIM and ILIM resistors very

close to their respective IC pins.

For

V

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

f_S=600kHz or 1.2MHz,

, C is

Δr_{BATT _MAX}= 0.1%

BATT

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:

Top Layer

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.

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.

Bottom Layer

Figure 13 PCB Layout Guide

Place the output inductor close to the IC and

connect the output capacitor between the

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30

MP2633 – 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.

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31

MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

TYPICAL APPLICATION CIRCUITS

Figure14: Detailed Application Circuit

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MP2633 – 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

13

1

6

0.50

BSC

3.90

2.50

2.80

PIN 1 ID

INDEX AREA

4.10

0.18

0.30

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. Users should warrant and guarantee that third

party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not

assume any legal responsibility for any said applications.

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33


型号：	MP2633GR
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：928K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MP2633GR [MPS]

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