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
1
C1, C2
C3
2
1
1
1
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
R6
3
3
1
1
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
R8
C4
S1
U1
1
33pF 10ꢀ, 50V C0G ceramic
capacitor (0402)
Taiyo Yuden UMK105CG330KV
C5
High-voltage, dual-input, USB/AC
adapter charger
(8 TDFN-EP*)
Maxim MAX8804ZETA+
(Top Mark: AAC)
Green LEDs
Agilent HSMG-C150
1
D1, D2, D3
D4
3
1
Bias resistor transistor
ON Semiconductor DTC144E
ICM7555ISA+ or
Digi-Key LM555CM-ND
U2
—
1
1
Male, USB type-B right-angle connector
Digi-Key AE9925-ND
Assmann AU-Y1007-R
J1
1
1
PCB: MAX8804Z Evaluation Kit+
*EP = Exposed pad.
3-pin header
Sullins PTC36SAAN
Digi-Key S1012-36-ND
JU1
________________________________________________________________ Maxim Integrated Products
1
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.
2
_______________________________________________________________________________________
Evluates:VWY/MAX804Z
MAX8804Z Evaluation Kit
Evluates:VWY/MAX804Z
Table 1. SET Truth Table
SET
0
V
V
CHARGER STATUS
DC
USB
Invalid
Invalid
Valid
Invalid
Valid
Off
0
Off
0
Invalid
Valid
DC charging mode enabled/USB charging mode disabled
0
Valid
DC charging mode enabled/USB charging mode disabled
1
Invalid
Invalid
Valid
Invalid
Valid
Off
1
DC charging mode disabled/USB charging mode enabled
1
Invalid
Valid
Off
Off
1
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
70
4th
550
80
±th
550
90
6th
550
100
7th
550
70
8th
600
80
9th
600
90
10th 11th 12th 13th 14th
I
(mA)
500
80
500
90
600
100
600
70
450
80
450
90
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
I
(mA)
—
—
450
70
400
80
400
90
400
100
400
70
650
80
650
90
650
100
650
70
700
80
700
90
700
100
700
70
500
80
CHG
Top-Off Current
Threshold (mA)
_______________________________________________________________________________________
3
MAX8804Z Evaluation Kit
Table 3. MAX8804W DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT 1st
2nd
450
100
3rd
450
70
4th
550
80
±th
550
90
6th
550
100
7th
550
70
8th
500
80
9th
500
90
10th 11th 12th 13th 14th
I
(mA)
450
80
450
90
500
100
500
70
400
80
400
90
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
I
(mA)
400
70
600
80
600
90
600
100
600
70
650
80
650
90
650
100
650
70
700
80
700
90
700
100
700
70
450
80
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
I
(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
I
(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.
4
_______________________________________________________________________________________
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
I
95
380
475
95
CHG
I
380
475
95
380
CHG
Top-Off Current
Threshold (mA)
Top-Off Current
Threshold (mA)
80
80
80
80
80
80
80
80
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
> 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
J1
1
2
3
4
D1
D2
D3
R1
330Ω
R2
330Ω
R3
330Ω
6
3
CHG
POK
CHG
5
USBIN
USB
POK
C2
1μF
8
4
2
7
GND
GND
DC
USBPWR
USBPWR/DETBAT
JU2
U1
DCIN
C1
1μF
R8
4.7kΩ
MAX8804Z
EP
1
BAT
BAT
SET
SET
C3
2.2μF
+3.3V
8
VCC
R4
100kΩ
R7
100kΩ
R6
1kΩ
R5
100kΩ
4
3
7
1
2
3
DISCHARGE
OUTPUT
C5
33pF
6
2
JU1
THRESHOLD
TRIGGER
3
U2
ICM7555
C4
0.1μF
S1
1
D4
DTC144E
GND
1
2
Figure 1. MAX8804Z EV Kit Schematic
6
_______________________________________________________________________________________
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
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
相关型号:
MAX8805WEREAA+T
Switching Regulator, Current-mode, 1.15A, 2000kHz Switching Freq-Max, BICMOS, PBGA16, ROHS COMPLIANT, UCSP-16
MAXIM
MAX8805WEREAE+T
Switching Regulator, Current-mode, 1.15A, 2000kHz Switching Freq-Max, BICMOS, PBGA16, ROHS COMPLIANT, UCSP-16
MAXIM
MAX8805WEREEE+T
Switching Regulator, Current-mode, 1.15A, 2000kHz Switching Freq-Max, BICMOS, PBGA16, ROHS COMPLIANT, UCSP-16
MAXIM
MAX8805WEWEAE+
Switching Regulator/Controller, Voltage-mode, 2000kHz Switching Freq-Max, BICMOS, PBGA16
MAXIM
MAX8805WEWEBE+
Switching Regulator/Controller, Voltage-mode, 2000kHz Switching Freq-Max, BICMOS, PBGA16
MAXIM
MAX8805WEWECC+
Switching Regulator/Controller, Voltage-mode, 2000kHz Switching Freq-Max, BICMOS, PBGA16
MAXIM
MAX8805WEWECD+
Switching Regulator/Controller, Voltage-mode, 2000kHz Switching Freq-Max, BICMOS, PBGA16
MAXIM
©2020 ICPDF网 联系我们和版权申明