MAX8804ZEVKIT [MAXIM]

Power-Present and Charger-Status Outputs;


型号：	MAX8804ZEVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Power-Present and Charger-Status Outputs
文件：	总7页 (文件大小：136K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-4090; Rev 0; 4/08

MAX8804Z Evaluation Kit

Evluates:VWY/MAX804Z

General Description

Features

♦ Complete Charger for Single-Cell Li+ Battery

♦ Dual-Input, 30V AC Adapter/16V USB

The MAX8804Z evaluation kit (EV kit) is a fully assem-

bled and tested PCB that demonstrates the highly inte-

grated MAX8804Z linear battery charger for single-cell

lithium-ion (Li+) batteries. The EV kit safely charges a

single Li+ battery to 4.2V. The EV kit accepts a 4.15V to

30V DC source voltage or a 4.15V to 16V USB input

voltage, but disables charging when either input volt-

age exceeds 7.5V to protect against unqualified or

faulty input sources. A simple single-wire SET input to

the EV kit allows the user to enable/disable the charger

or program the charge current and top-off threshold.

Three LEDs on the EV kit indicate the power-OK, USB

power status, and charger status. The MAX8804Z EV kit

can also evaluate the MAX8804V/MAX8804W/

MAX8804Y. To evaluate the MAX8804V/MAX8804W/

MAX8804Y, order a free sample along with this EV kit.

♦ No External FET, Blocking Diode, or Sense

Resistor Required

♦ Automatic USB/AC Adapter Input Selection

♦ Easy Programmable Fast-Charge Current and

Top-Off Threshold

♦ Proprietary Die Temperature Regulation Control

♦ ±±5 Fast-Charge Current-Limit Accuracy

♦ Battery-Pack Detection Input (MAX8804V/

MAX8804W)

♦ Power-Present and Charger-Status Outputs

♦ No Prequalification Charge (MAX8804Y)

♦ Tiny 2mm x 3mm Thermally Enhanced TDFN

Package

♦ Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX8804ZEVKIT+

EV Kit

+Denotes lead-free and RoHS-compliant.

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

2-pin header

Sullins PTC36SAAN

1µF 10ꢀ, 35V X5R ceramic

capacitors (0603)

JU2

C1, C2

Digi-Key S1012-36-ND

Taiyo Yuden GMK107BJ105KA

2.2µF 10ꢀ, 10V X5R ceramic

capacitor (0603)

Taiyo Yuden LMK107BJ225KA

R1, R2, R3

R4, R5, R7

330Ω 5ꢀ resistors (0603)

100kΩ 5ꢀ resistors (0402)

1kΩ 5ꢀ resistor (0402)

4.7kΩ 5ꢀ resistor (0603)

Momentary pushbutton switch

Panasonic EVQ-PHP03T

Digi-Key P8048STR-ND

0.1µF 10ꢀ, 10V X5R ceramic

capacitor (0402)

Taiyo Yuden LMK105BJ104KV

33pF 10ꢀ, 50V C0G ceramic

capacitor (0402)

Taiyo Yuden UMK105CG330KV

High-voltage, dual-input, USB/AC

adapter charger

(8 TDFN-EP*)

Maxim MAX8804ZETA+

(Top Mark: AAC)

Green LEDs

Agilent HSMG-C150

D1, D2, D3

Bias resistor transistor

ON Semiconductor DTC144E

ICM7555ISA+ or

Digi-Key LM555CM-ND

—

Male, USB type-B right-angle connector

Digi-Key AE9925-ND

Assmann AU-Y1007-R

PCB: MAX8804Z Evaluation Kit+

*EP = Exposed pad.

3-pin header

Sullins PTC36SAAN

Digi-Key S1012-36-ND

JU1

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

MAX8804Z Evaluation Kit

11) Verify that the CHG LED (D1) turns on. The CHG

LED turns on during prequalification and fast-

charge conditions. The CHG LED turns off when the

battery-charging current drops below the top-off

threshold current.

Component Suppliers

SUPPLIER

Agilent Technologies

Digi-Key Corp.

PHONE

WEBSITE

877-424-4536 www.agilent.com

800-344-4539 www.digikey.com

602-244-6600 www.onsemi.com

847-925-0888 www.yuden.co.jp

ON Semiconductor

Taiyo Yuden

12) Turn off the power supplies and disconnect the bat-

tery. Place the JU1 shunt across pins 2-3 to set

USB charge mode. Then repeat from step 3 using

the USBIN pad.

Note: Indicate that you are using the MAX8804Z when contacting

these component suppliers.

Quick Start

Detailed Description

Recommended Equipment

Input Source

The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z are

designed to charge a single-cell Li+ battery from a

4.15V to 7.0V DC source voltage or USB input voltage.

The IC accepts DC input voltages up to 30V and USB

input voltages up to 16V, but disables charging when

the input voltage exceeds 7.5V. A male, USB type-B

jack is available to connect the MAX8804Z EV kit to a

standard 100mA/500mA USB port to power the EV kit.

Before beginning, the following equipment is needed:

• Two variable 6V power supplies capable of 750mA

• One voltmeter

• One-cell Li+ battery

Procedure

The MAX8804Z EV kit is a fully assembled and tested

surface-mount PCB. Follow the steps below to verify

board operation. Caution: Do not turn on the power

supplies until all connections are completed.

1) Place the JU1 shunt across pins 1-2 to set the EV kit

for DC charge mode.

Charging Profile

The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z

dual-input linear battery chargers use voltage, current,

and thermal-control loops to charge and protect

a single Li+ battery. When a Li+ battery with a

cell voltage below 2.5V is inserted, the

MAX8804V/MAX8804W/MAX8804Z charger enters the

prequalification stage where it precharges that cell

with 95mA. The CHG indicator output is driven low to

indicate entry into the prequalification state. When bat-

tery voltage exceeds 2.5V, the charger soft-starts as it

enters the fast-charge state. The MAX8804Y el-

iminates the prequalification state and enters fast

charge when the battery is inserted. In the

MAX8804V/MAX8804W/MAX8804Y/MAX8804Z, the

fast-charge current level is programmed by a simple

single-wire SET input. As the battery voltage approach-

es 4.2V, the charging current is reduced. If the battery

current drops below the top-off current threshold, the

CHG indicator goes high impedance, signaling that

the battery is fully charged. The ICs then enter a con-

stant voltage-regulation mode to maintain the battery at

full charge.

2) Verify that jumper JU2 is open.

3) Preset a power supply to 5V and the second power

supply to 3.3V. Turn off the power supplies.

4) Connect the positive lead of the 5V power supply to

the DCIN pad. Connect the negative lead of the 5V

power supply to the GND pad.

5) Connect the positive lead of the 3.3V power supply

to the VLOGIC pad. Connect the negative lead of

the 3.3V power supply to the GND pad.

6) Connect the voltmeter from the BAT pad to the

GND pad.

7) Turn on the power supplies.

8) Verify that the POK LED (D2) turns on to indicate

power OK.

9) Verify that the voltage is 4.2V at the BAT pad.

10) Observe correct Li+ battery polarity. Connect the

positive terminal of the Li+ battery to the BAT pad.

Connect the negative terminal of the Li+ battery to

the GND pad.

_______________________________________________________________________________________

Evluates:VWY/MAX804Z

MAX8804Z Evaluation Kit

Evluates:VWY/MAX804Z

Table 1. SET Truth Table

SET

CHARGER STATUS

USB

Invalid

Valid

Invalid

Valid

Off

Invalid

Valid

DC charging mode enabled/USB charging mode disabled

Valid

DC charging mode enabled/USB charging mode disabled

Invalid

Valid

Invalid

Valid

Off

DC charging mode disabled/USB charging mode enabled

Invalid

Valid

Off

Valid

Note: This table is true when DETBAT = low for the MAX8804V/MAX8804W. When DETBAT = high, the MAX8804V/MAX8804W enter

shutdown.

the charge current and top-off threshold. With the JU1

shunt across pins 1-2, pressing the S1 switch generates

pulses to program the DC charging current, as shown in

Tables 2, 3, and 4. With the JU1 shunt across pins 2-3,

pressing the S1 switch generates pulses to program the

USB charging current, as shown in Tables 5 and 6. Refer

to the MAX8804V/MAX8804W/MAX8804Y/MAX8804Z IC

data sheet for timing diagrams.

SET Input

SET is a logic input for selecting the DC/USB charging

mode and charging current. Drive SET low or leave it

unconnected to enable DC charging mode. Drive SET

high to enable USB charging mode (see Table 1).

SET can also be driven by series pulses to program the

charging current in both DC and USB mode. Pulse-

generating circuitry is included on the EV kit to program

Table 2. MAX8804Y/MAX8804Z DC Charging Current Programming by Series Pulses

PULSE

NUMBER

DEFAULT 1st

2nd

500

100

3rd

500

4th

550

±th

550

6th

550

100

7th

550

8th

600

9th

600

10th 11th 12th 13th 14th

(mA)

500

600

100

600

450

100

CHG

Top-Off Current

Threshold (mA)

PULSE

NUMBER

DEFAULT 1±th 16th 17th 18th 19th 20th 21st 22nd 23rd 24th 2±th 26th 27th 28th

(mA)

—

450

400

100

400

650

100

650

700

100

700

500

CHG

Top-Off Current

Threshold (mA)

_______________________________________________________________________________________

MAX8804Z Evaluation Kit

Table 3. MAX8804W DC Charging Current Programming by Series Pulses

PULSE

NUMBER

DEFAULT 1st

2nd

450

100

3rd

450

4th

550

±th

550

6th

550

100

7th

550

8th

500

9th

500

10th 11th 12th 13th 14th

(mA)

450

500

100

500

400

100

CHG

Top-Off Current

Threshold (mA)

PULSE

NUMBER

—

1±th 16th 17th 18th 19th 20th 21st 22nd 23rd 24th 2±th 26th 27th 28th

(mA)

400

600

100

600

650

100

650

700

100

700

450

CHG

Top-Off Current

Threshold (mA)

Table 4. MAX8804V DC Charging Current Programming by Series Pulses

PULSE

NUMBER

DEFAULT 1st

2nd

450

180

3rd

450

200

4th

550

120

±th

550

140

6th

550

180

7th

550

200

8th

500

120

9th

500

140

10th 11th 12th 13th 14th

(mA)

450

120

450

140

500

180

500

200

400

120

400

140

400

180

CHG

Top-Off Current

Threshold (mA)

PULSE

NUMBER

—

1±th 16th 17th 18th 19th 20th 21st 22nd 23rd 24th 2±th 26th 27th 28th

(mA)

400

200

600

120

600

140

600

180

600

200

650

120

650

140

650

180

650

200

700

120

700

140

700

180

700

200

450

120

CHG

Top-Off Current

Threshold (mA)

DC Charging Mode

USB Charging Mode

The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z

automatically select between either a USB or AC

adapter input source. Drive SET low or leave it uncon-

nected to enable DC charging mode. Subsequent

pulses on SET program the charging current and the

top-off threshold. There are seven fast-charge current

options and four top-off threshold options. Pulse SET

high (1µs to 1ms pulse width) subsequently to realize

charging current and top-off threshold programming and

transition. After the 28th pulse, the MAX8804V/

MAX8804W/MAX8804Y/MAX8804Z return to the default

mode and start a new cycle. See Tables 2, 3, and 4 to

set the desired charging current and top-off threshold.

Drive SET high longer than 2ms to disable DC charging

control circuitry.

Drive SET high to enable USB charging mode when the

USB input is valid. Subsequent low pulses with 1µs to

1ms pulse width on SET program the fast-charging cur-

rent from 95mA, 380mA, to 475mA for the MAX8804Y/

MAX8804Z, and from 380mA, 475mA, to 95mA for the

MAX8804V/MAX8804W, and then repeat a new cycle

as shown in Tables 5 and 6. Drive SET low or leave it

unconnected longer than 2ms to disable USB charging

control circuitry.

_______________________________________________________________________________________

Evluates:VWY/MAX804Z

MAX8804Z Evaluation Kit

Evluates:VWY/MAX804Z

Table ±. MAX8804Y/MAX8804Z

USB Charging Current Programming by

Series Pulses

Table 6. MAX8804V/MAX8804W

USB Charging Current Programming by

Series Pulses

PULSE NUMBER

(mA)

DEFAULT

1st

2nd

3rd

PULSE NUMBER

(mA)

DEFAULT

1st

2nd

3rd

380

475

CHG

380

475

380

CHG

Top-Off Current

Threshold (mA)

Top-Off Current

Threshold (mA)

Battery Pack Detection Input (DETBAT)

(MAX8804V/MAX8804W Only)

The DETBAT input is pulled up to an internal 3V supply

through a 63kΩ resistor. Installing a shunt on jumper

JU2 allows SET to control the charger. The MAX8804V/

MAX8804W enter shutdown when the shunt on jumper

JU2 is removed.

Charging-Status Output (CHG)

The CHG LED (D1) indicates charging status. The LED

is on (CHG low) when the charger is in the prequalifica-

tion or fast-charge mode. It is off (CHG high imped-

ance) when the charger reaches the top-off mode for

more than 4ms, indicating that charging is done.

Power-OK Output (POK)

The POK LED (D2) is a visual indicator of power-OK

status. When a valid input at either DC or USB is

detected greater than 4.15V and exceeds the battery

voltage by 250mV, POK pulls low to indicate that the

input power is OK. Otherwise, POK is high impedance.

POK status is maintained regardless of SET status.

Thermal-Regulation Control

The thermal-regulation loop limits the MAX8804V/

MAX8804W/MAX8804Y/MAX8804Z die temperature to

+105°C by reducing the charge current as necessary.

This feature not only protects the ICs from overheating,

but also allows a higher charge current at room temper-

ature, without risking damage to the system.

USB Power Status Output (USBPWR)

(MAX8804Y/MAX8804Z Only)

The USBPWR LED (D3) indicates USB power status

output. The LED is on (USBPWR low) when

Evaluating the

MAX8804V/MAX8804W/MAX8804Y

For evaluating the MAX8804V/MAX8804W/MAX8804Y,

carefully remove the MAX8804Z IC (U1) and install the

MAX8804V/MAX8804W/MAX8804Y IC. All other compo-

nents remain the same.

> V

and V

- V

> 250mV. Otherwise, it

USB

UVLO

USB

BAT

is high impedance. USBPWR indicates the USB input

presence regardless of SET status and charger status.

_______________________________________________________________________________________

MAX8804Z Evaluation Kit

+3.3V

VLOGIC

330Ω

CHG

POK

CHG

USBIN

USB

POK

1μF

GND

USBPWR

USBPWR/DETBAT

JU2

DCIN

1μF

4.7kΩ

MAX8804Z

BAT

SET

2.2μF

+3.3V

VCC

100kΩ

1kΩ

100kΩ

DISCHARGE

OUTPUT

33pF

JU1

THRESHOLD

TRIGGER

ICM7555

0.1μF

DTC144E

GND

Figure 1. MAX8804Z EV Kit Schematic

_______________________________________________________________________________________

Evluates:VWY/MAX804Z

MAX8804Z Evaluation Kit

Evluates:VWY/MAX804Z

Figure 2. MAX8804Z EV Kit Component Placement Guide—

Component Side

Figure 3. MAX8804Z EV Kit PCB Layout—Top Layer

Figure 4. MAX8804Z EV Kit PCB Layout—Bottom Layer

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7

is a registered trademark of Maxim Integrated Products, Inc.

MAX8804ZEVKIT [MAXIM]

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