19-4090; Rev 0; 4/08
MAX8804Z Evaluation Kit
The MAX8804Z evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the highly integrated 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 voltage 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.
Features
♦ Complete Charger for Single-Cell Li+ Battery
♦ Dual-Input, 30V AC Adapter/16V USB
♦ 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
C1, C2
2
1µF ±10%, 35V X5R ceramic
capacitors (0603)
Taiyo Yuden GMK107BJ105KA
C3
1
2.2µF ±10%, 10V X5R ceramic
capacitor (0603)
Taiyo Yuden LMK107BJ225KA
C4
1
0.1µF ±10%, 10V X5R ceramic
capacitor (0402)
Taiyo Yuden LMK105BJ104KV
C5
1
33pF ±10%, 50V C0G ceramic
capacitor (0402)
Taiyo Yuden UMK105CG330KV
D1, D2, D3
3
Green LEDs
Agilent HSMG-C150
D4
1
Bias resistor transistor
ON Semiconductor DTC144E
1
Male, USB type-B right-angle connector
Digi-Key AE9925-ND
Assmann AU-Y1007-R
1
3-pin header
Sullins PTC36SAAN
Digi-Key S1012-36-ND
J1
JU1
DESIGNATION QTY
DESCRIPTION
JU2
1
2-pin header
Sullins PTC36SAAN
Digi-Key S1012-36-ND
R1, R2, R3
3
330Ω ±5% resistors (0603)
R4, R5, R7
3
100kΩ ±5% resistors (0402)
R6
1
1kΩ ±5% resistor (0402)
R8
1
4.7kΩ ±5% resistor (0603)
S1
1
U1
1
U2
1
ICM7555ISA+ or
Digi-Key LM555CM-ND
—
1
PCB: MAX8804Z Evaluation Kit+
Momentary pushbutton switch
Panasonic EVQ-PHP03T
Digi-Key P8048STR-ND
High-voltage, dual-input, USB/AC
adapter charger
(8 TDFN-EP*)
Maxim MAX8804ZETA+
(Top Mark: AAC)
*EP = Exposed pad.
________________________________________________________________ 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.
1
Evaluates: MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
General Description
Evaluates: MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
MAX8804Z Evaluation Kit
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Agilent Technologies
877-424-4536
Digi-Key Corp.
800-344-4539
www.digikey.com
ON Semiconductor
602-244-6600
www.onsemi.com
Taiyo Yuden
847-925-0888
www.yuden.co.jp
www.agilent.com
Note: Indicate that you are using the MAX8804Z when contacting
these component suppliers.
Quick Start
11) Verify that the CHG LED (D1) turns on. The CHG
LED turns on during prequalification and fastcharge conditions. The CHG LED turns off when the
battery-charging current drops below the top-off
threshold current.
12) Turn off the power supplies and disconnect the battery. Place the JU1 shunt across pins 2-3 to set
USB charge mode. Then repeat from step 3 using
the USBIN pad.
Detailed Description
Recommended Equipment
Input Source
Before beginning, the following equipment is needed:
• Two variable 6V power supplies capable of 750mA
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.
• 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.
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.
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 battery voltage exceeds 2.5V, the charger soft-starts as it
enters the fast-charge state. The MAX8804Y eliminates 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 approaches 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 constant voltage-regulation mode to maintain the battery at
full charge.
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.
2
_______________________________________________________________________________________
MAX8804Z Evaluation Kit
SET
VDC
VUSB
CHARGER STATUS
0
Invalid
Invalid
Off
0
Invalid
Valid
Off
0
Valid
Invalid
DC charging mode enabled/USB charging mode disabled
0
Valid
Valid
DC charging mode enabled/USB charging mode disabled
1
Invalid
Invalid
Off
1
Invalid
Valid
DC charging mode disabled/USB charging mode enabled
1
Valid
Invalid
Off
1
Valid
Valid
Off
Note: This table is true when DETBAT = low for the MAX8804V/MAX8804W. When DETBAT = high, the MAX8804V/MAX8804W enter
shutdown.
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. Pulsegenerating circuitry is included on the EV kit to program
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.
Table 2. MAX8804Y/MAX8804Z DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
ICHG (mA)
500
500
500
500
550
550
550
550
600
600
600
600
450
450
450
Top-Off Current
Threshold (mA)
80
90
100
70
80
90
100
70
80
90
100
70
80
90
100
PULSE
NUMBER
DEFAULT
15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th
26th
27th
28th
ICHG (mA)
—
450
400
400
400
400
650
650
650
650
700
700
700
700
500
Top-Off Current
Threshold (mA)
—
70
80
90
100
70
80
90
100
70
80
90
100
70
80
_______________________________________________________________________________________
3
Evaluates: MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
Table 1. SET Truth Table
Evaluates: MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
MAX8804Z Evaluation Kit
Table 3. MAX8804W DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
ICHG (mA)
450
450
450
450
550
550
550
550
500
500
500
500
400
400
400
Top-Off Current
Threshold (mA)
80
90
100
70
80
90
100
70
80
90
100
70
80
90
100
PULSE
NUMBER
—
15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th
26th
27th
28th
ICHG (mA)
—
400
600
600
600
600
650
650
650
650
700
700
700
700
450
Top-Off Current
Threshold (mA)
—
70
80
90
100
70
80
90
100
70
80
90
100
70
80
Table 4. MAX8804V DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
ICHG (mA)
450
450
450
450
550
550
550
550
500
500
500
500
400
400
400
Top-Off Current
Threshold (mA)
120
140
180
200
120
140
180
200
120
140
180
200
120
140
180
PULSE
NUMBER
—
15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th
26th
27th
28th
ICHG (mA)
—
400
600
600
600
600
650
650
650
650
700
700
700
700
450
Top-Off Current
Threshold (mA)
—
200
120
140
180
200
120
140
180
200
120
140
180
200
120
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 unconnected 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 current 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.
4
_______________________________________________________________________________________
MAX8804Z Evaluation Kit
PULSE NUMBER
Table 6. MAX8804V/MAX8804W
USB Charging Current Programming by
Series Pulses
DEFAULT
1st
2nd
3rd
DEFAULT
1st
2nd
3rd
ICHG (mA)
95
380
475
95
ICHG (mA)
380
475
95
380
Top-Off Current
Threshold (mA)
80
80
80
80
Top-Off Current
Threshold (mA)
80
80
80
80
Charging-Status Output (CHG)
The CHG LED (D1) indicates charging status. The LED
is on (CHG low) when the charger is in the prequalification or fast-charge mode. It is off (CHG high impedance) 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.
USB Power Status Output (USBPWR)
(MAX8804Y/MAX8804Z Only)
The USBPWR LED (D3) indicates USB power status
output. The LED is on (USBPWR low) when
VUSB > VUVLO and VUSB - VBAT > 250mV. Otherwise, it
is high impedance. USBPWR indicates the USB input
presence regardless of SET status and charger status.
PULSE NUMBER
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.
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 temperature, without risking damage to the system.
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 components remain the same.
_______________________________________________________________________________________
5
Evaluates: MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
Table 5. MAX8804Y/MAX8804Z
USB Charging Current Programming by
Series Pulses
Evaluates: MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
MAX8804Z Evaluation Kit
+3.3V
J1
VLOGIC
1
D1
D2
D3
R1
330Ω
R2
330Ω
R3
330Ω
2
3
4
5
USBIN
C2
1μF
GND
8
4
DCIN
CHG
USB
USBPWR
GND
CHG
3
POK
2
USBPWR/DETBAT
JU2
U1
DC
C1
1μF
R8
4.7kΩ
MAX8804Z
1
BAT
POK
6
BAT
SET
7
SET
EP
C3
2.2μF
+3.3V
R4
100kΩ
R7
100kΩ
C5
33pF
S1
R6
1kΩ
7
6
2
C4
0.1μF
8
VCC
DISCHARGE
R5
100kΩ
4
OUTPUT
1 2
3
3
JU1
THRESHOLD
3
TRIGGER
U2
ICM7555
1
D4
DTC144E
GND
1
2
Figure 1. MAX8804Z EV Kit Schematic
6
_______________________________________________________________________________________
MAX8804Z Evaluation Kit
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
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
Evaluates: MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
Figure 2. MAX8804Z EV Kit Component Placement Guide—
Component Side