MPS EV2637A-R-00A Manuale utente

EV2637A-R-00A

2.5A Single Cell Switch Mode Battery Charger

with Power Path Management (PPM)

and 2.4A Boost Current with Trickle Timer

EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 1

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DESCRIPTION

The EV2637A-R-00A is the evaluation board

designed to demonstrate the capabilities of

MPS’ MP2637A, 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.

EV2637A uses two operating modes—charge

mode and boost mode—to allow management

of system and battery power based on the state

of the input.

When input power is present, the board

charges a single-cell battery with a

programmable charge current of up to 2.5A.

In the absence of an input source, the board

switches to boost mode through the MODE pin

to power the SYS pins from the battery with a

current of up to 2.1A.

The evaluation board provides full-operating-

status indicators to distinguish charge mode

from boost mode.

To guarantee safe operation, the EV2637A has

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.

ELECTRICAL SPECIFICATION

Parameter

Symbol

Value

Units

Charge Mode

Input Voltage Range

VIN

4.5 –6

Charge-Full Voltage

VBATT_Full

4.055 /4.2

Charge Current

ICHG

2.5

Input Current Limit

IIN_LIM

2.7

Boost Mode

Battery Voltage

VBATT

3-4.5

SYS Voltage

Regulation

VSYS

SYS Output Current

Limit

ISYS

2.2

FEATURES

4.5V-to-6V Operating Input Voltage Range

Power Management Function Integrated

Input-Current-Limit and Input –Voltage -

Regulation

Up to 2.5A Programmable Charge Current

Selectable 4.055V / 4.2V Charge Voltage

with 0.5% Accuracy

Battery Temperature Monitoring

Full Operation Indicators

Programmable Timer-Back-Up Protection

Battery-Reverse-Leakage Blocking

Reverse-Boost-Operation for Powering

System

Up to 93% 5V Boost Mode Efficiency @

2.1A with BATT=4.2V

Up to 2.1A Programmable Output Current

Limit in Boost Mode

APPLICATIONS

Sub-battery Applications

Power-bank Applications for Smart-Phone,

Tablet and Other Portable Devices

All MPS parts arelead-free and adhere to theRoHS 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 PowerSystems, Inc.

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER

EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 2

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EV2637A-R-00A EVALUATION BOARD

(L × W × H) 6.1cm × 5.1cm × 1.3cm

Board Number

MPS IC Number

EV2637A-R-00A

MP2637AGR

EVALUATION BOARD SCHEMATIC

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER

EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 3

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EV2637A-R-00A BILL OF MATERIALS

Qty.

Ref

Value

Description

Package

Manufacture

Manufacture_PN

1μF

Ceramic Capacitor;

25V;X7R

0603

TDK

C1608X7R1E105K

1μF

Ceramic Capacitor;

16V;X7R;

0603

muRata

GRM188R71C105KA12D

C3, C7,

CBATT,

CSYS

22μF

Ceramic Capacitor;

10V;X7R;

1206

muRata

GRM31CR71A226KE15L

C4,

CTMR

100nF

Ceramic Capacitor;

16V;X7R;

0603

muRata

GRM188R71C104KA01D

Ceramic Capacitor;

25V;X5R;

1206

Ceramic Capacitor;

10V;X7R;

1206

Ceramic Capacitor;

50V;C0G;

0603

Ceramic Capacitor;

25V;X7R;

0603

C10,C1

Ceramic Capacitor;

16V;X7R;

0603

CIN

22μF

Ceramic Capacitor;

25V;X5R;

1206

murata

GRM31CR61E226KE15

2.2μH

Inductor;2.2uH;9m;7.

SMD

muRata

LQH88PN2R2N38

LED2,

LED3

BL-

HUF35A-

TRB

LED; Red

0805

BRIGHT LED

BL-HUF35A-TRB

LED1

BL-

HGB35A-

TRB

LED; Green

0805

BRIGHT LED

BL-HGB35A-TRB

31.6kΩ

Film Resistor;1%;

0603

Yageo

RC0603FR-0731K6L

R2,

RT1,

RT2

10kΩ

Film Resistor;1%;

0603

Yageo

RC0603FR-0710KL

15kΩ

Film Resistor;1%;

0603

Yageo

RC0603FR-0715KL

RILIM

16.5kΩ

Film Resistor;1%;

0603

Yageo

RC0603FR-0716K5L

R4, RL

5.1kΩ

Film Resistor;1%;

0603

Yageo

RC0603FR-075K1L

R5, R6,

10kΩ

Film Resistor;5%;

0603

Yageo

RC0603JR-0710K

R9,

R10,

R11

2kΩ

Film

Resistor;5%;1/10W

0603

LIZ

CR0603JA0202G

23.7kΩ

Film Resistor; 1%

0603

Yageo

RC0603FR-0723K7L

RISET

47.5kΩ

Film Resistor;1%

0603

Yageo

RC0603FR-0747K5L

ROLM

53.6kΩ

Film Resistor;1%

0603

Yageo

RC0603FR-0753K6L

RS1

20mΩ

Film Resistor;1%

1206

Vishay

WSL1206-18

0Ω

Film Resistor;5%;

0603

Yageo

RC0603JR-070RL

MP2637

AGR

QFN24

(4mmx4mm)

MPS

MP2637AGR

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER

EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 4

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PRINTED CIRCUIT BOARD LAYOUT

Figure 1: Top Silkscreen Layer

Figure 2: Top Layer

Figure 3: Bottom Layer

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER

EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 5

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QUICK START GUIDE

This board is designed for the MP2637A, a stand-alone switch-mode battery charge management and

system power path management device with integrated reverse directional boost from BATT to SYS.

The board’ layout accommodates most commonly-used capacitors. The default function of this board is

preset at charge mode, and the charge full voltage is preset to 4.2V for a 1-cell Li-Ion battery.

Charge Mode Setting

1. Input-Over-Voltage-Limit

The MP2637A has a PWIN pin to monitor the input voltage. Once the voltage input voltage at PWIN

pin exceeds 1.15V, the input to system path is cut off to protect the device from being damaged.

The maximum input is 6V, and the external resistor divider must meet the following equation:

PWIN

V1.15 RL

V 6 RH RL





(1)

Assume that RL=5.1kΩ, then RH is 21.5kΩ.

2. REG Voltage

When the input power source is not sufficient to support both the charge current and system load

current, the charge current is reduced to allow priority of system power and maintain the input

voltage avoid dropping further. The REG pin is the input-voltage regulation feedback. The input

voltage can be regulated by a resistor divider from VIN pin to REG pin to AGND

)(

44R3

15.1 V

VVREG





(2)

If VREG=4.75V, given R4=5.1kΩ, then R3=15.8kΩ.

3. Input Current Limit

An input current limit can be set slightly below the input source’s maximum current rating. When the

input current hits this limit, the charge current will decrease to keep the input current constant at the

limit value to initially power the system. RILIM—the resistor connected to the ILIM pin—programs this

limit. To set the input current limit at 2.7A, use an RILIM of 16.5kΩ.



ILIM ILIM

45(kV)

I (A) R (kΩ)

(3)

4. Charge-Full Voltage

To set the charge-full voltage, either leave the VB pin floating, or connect it to high logic for 4.055V

and to connect to GND for 4.2V.

5. Charge Current

The charge current can be programmed via both RS1 and RISET. With given RS1=20mΩ, determine

the charge current using the following formula:

CHG ISET

2400

I (A) R (k ) RS1(mA)



(4)

For example, for a charge current of 2.5A, use a 47.5kΩRISET.

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER

EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 6

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6. Charge Timer

The MP2637A has a charge timer as an extra precaution against charging damaged batteries. The

total charge time can be set as:

6TMR

TOTAL_TMR CHG

3.4 10 1.6(V) C ( F) (s)

1.25 I (A) RS1(m ) 2( A)

   



    

(5)

So if the charge current is 2.5A, a CTMR of 0.1μF provides a tTOTAL_TMR of 2.4 hours.

Boost Mode

1. System Output Voltage

The MODE pin can enable or disable the EV2637A when in boost mode. The resistor divider–R1

and R2–can adjust the output voltage as per the following equation:

221

15.1)(

_RRR

VVV REGSYS





(6)

Select R1 and R2 as 31.6kΩ and 10kΩ, respectively, for a system voltage of 4.8V.

2. System-Output-Current Limit

Set the system-output-current limit in boost mode for the EV2637A to operate like a standard

adapter. Set the output current limit as per the following equation:

OLIM OLIM

2400

I (A) R (k ) RS1(m )

  

(7)

For the other detailed description on the operation of the MP2637A, please refer to the

datasheet.

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER

EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 7

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EQUIPMENT REQUIREMENT

Evaluation requires the following equipments:

1. DC power source. The output voltage should exceed 6.0V, and output current greater than

2.5A.

2. Battery simulator or a single-cell battery pack. The battery simulator’s output rating should

exceed 4.5V/3.0A. When using a real battery pack, please observe all precautions on the

battery manufacturer’s data sheet first and ensure the charger’s setting doesn’t exceed the

battery’s absolute maximum specifications.

3. An oscilloscope. A single voltage probe and a single current probe.

4. Multi-meter.

Charge Function

1 Connect the jumper “EN” to “H” and the “MODE” to “L” to shunts, respectively!

2 Attach the positive and negative ends of the battery to the “BATT” and “GND” terminals,

respectively. If it’s a battery simulator, please preset the voltage to 3.8V (typical value) first.

3 Preset the DC power source to 5.0V. Then attach the DC output port and ground to the “VIN”

and “GND” terminals, respectively.

4 Turn on the DC power source. The charger will start. Use the oscilloscope to verify that the 2.5A

charge current is being delivered to the battery.

5 Remove the shunt between the “EN” and “H” to disable charging.

6 Re-insert the shunt between the “EN” and “H” to enable charging.

MAIN CIRCUIT

EV2637A-R-00A

GND

VIN

BATT

GND

1-Cell

Battery Pack

or Simulator

Power

Supply

LED2

LED3

SYS

VCC NTCGND

BATT

JP1 JP2 JP3

EN MODE

L L

LED1

LED

JP4

VCC

SYS

Figure 4: Setup for Charge Mode

EV2637A-R-00A –2.5A SINGLE-CELL SWITCH MODE BATTERY CHARGER

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.

EV2637A-R-00A Rev. 1.0 www.MonolithicPower.com 8

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Boost Function

1 Connect the jumper “MODE” to “H” and the “EN” to “L” with shunts respectively!

2 Attach the load to the “SYS” and “GND” terminals respectively.

3 Attach the positive and negative ends of the battery to the “BATT” and “GND” terminals respectively.

If it’s a battery simulator, please preset the voltage to 3.8V (typical value) firstly. The boost will start

to work. Verify the system output current is limited at 2.2A.

4 Remove the shunt between the “MODE” and “H” to disable boost.

5 Install the shunt between the “MODE” and “H” to enable boost.

MAIN CIRCUIT

EV2637A-R-00A

GND

VIN

BATT

GND

1-Cell

Battery Pack

or Simulator

SYS

load

LED2

LED3

SYS

VCC NTCGND

BATT

JP1 JP2 JP3

EN MODE

L L

LED1

LED

JP4

VCC

SYS

Figure 5: Setup for Boost Mode

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