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参数资料
| 型号： | MAX1508Y |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Linear Li+ Battery Charger with Integrated Pass FET. Thermal Regulation. and ACOK-bar in 3mm x 3mm TDFN |
| 中文描述： | 线性Li+电池充电器，带有集成调整FET、热调节和ACOK，3mm x 3mm TDFN封装 |
| 文件页数： | 8/11页 |
| 文件大小： | 198K |
| 代理商： | MAX1508Y |
M
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
8
_______________________________________________________________________________________
EN
(MAX1508/MAX1508Z)
EN
(MAX1508Y)
V
IN
V
BATT
I
BATT
CHG
STATE
X
X
V
BATT
V
IN
< 2.5V
≥
2.5V
4.2V
X
X
0
Hi-Z
Low
Low
Hi-Z
Hi-Z
Hi-Z
Shutdown
Prequalification
Fast Charge
Full Charge
Overvoltage
Disabled
Low
Low
Low
Low
High
High
High
High
High
Low
4.25V
≤
V
IN
≤
7V
4.25V
≤
V
IN
≤
7V
4.25V
≤
V
IN
≤
7V
>7V
X
10% of I
FAST
I
FAST
*
10% of I
FAST
0
0
X = Don’t care.
*
I
FAST
is reduced as necessary to maintain the die temperature at +100°C.
Table
1.
CHG
States
Capacitor Selection
Connect a ceramic capacitor from BATT to GND for
proper stability. Use a 1μF X5R ceramic capacitor for
most applications.
Connect a 1μF ceramic capacitor from IN to GND. Use
a larger input bypass capacitor for high input voltages
or high charging currents to reduce supply noise.
Connect a 0.47μF ceramic capacitor from VL to GND.
Thermal Considerations
The MAX1508 is in a thermally enhanced thin DFN pack-
age with exposed paddle. Connect the exposed paddle
of the MAX1508 to a large copper ground plane to pro-
vide a thermal contact between the device and the circuit
board. The exposed paddle transfers heat away from the
device, allowing the MAX1508 to charge the battery with
maximum current, while minimizing the increase in die
temperature.
DC Input Sources
The MAX1508 operates from well-regulated DC
sources. The full-charging input voltage range is 4.25V
to 7V. The device can stand up to 13V on the input
without damage to the IC. If V
IN
is greater than 7V, then
the MAX1508 stops charging.
An appropriate power supply must provide at least
4.25V when sourcing the desired peak charging cur-
rent. It also must stay below 6.5V when unloaded.
Application Circuits
Stand-Alone Li+ Charger
The MAX1508 provides a complete Li+ charging solu-
tion. The
Typical Operating Circuit
at the end of the
data sheet shows the MAX1508 as a stand-alone Li+
battery charger. The 2.8k
resistor connected to ISET
sets a charging current of 520mA. The LED indicates
when either fast-charge or precharge qualification has
begun. When the battery is full, the LED turns off.
Microprocessor-Interfaced Charger
Figure 3 shows the MAX1508 as a μP-cooperated Li+
battery charger. The MAX1508 and MAX1508Z start
charging the battery when
EN
is low. The μP can drive
EN
high to disable the charger (MAX1508 and
MAX1508Z). The MAX1508
’
s
ACOK
output indicates
the presence of a valid AC adapter to the μP.
CHG
can
be used to detect the charge status of a battery. By
monitoring V
ISET
, the system can measure the charge
current.
USB-Powered Li+ Charger
The universal serial bus (USB) provides a high-speed
serial communication port as well as power for the
remote device. The MAX1508 can be configured to
charge its battery at the highest current possible from
the host port. Figure 4 shows the MAX1508 as a USB
battery charger. To make the circuit compatible with
either 100mA or 500mA USB ports, the circuit initializes
at 95mA charging current. The microprocessor then
interrogates the host to determine its current capability.
If the host port is capable, the charging current is
increased to 435mA. The 435mA current was chosen to
avoid exceeding the 500mA USB specification.
Layout and Bypassing
Connect a 1μF ceramic input capacitor as close to the
device as possible. Provide a large copper GND plane
to allow the exposed paddle to sink heat away from the
device. Connect the battery to BATT as close to the
device as possible to provide accurate battery voltage
sensing. Make all high-current traces short and wide to
minimize voltage drops. For an example layout, refer to
the MAX1507/MAX1508 evaluation kit layout.
Chip Information
TRANSISTOR COUNT: 1812
PROCESS: BiCMOS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1508YETA | 制造商:Maxim Integrated Products 功能描述:LINEAR LI+ BATT CHARGR W INTEGRATD - Rail/Tube |
| MAX1508YETA+ | 制造商:Maxim Integrated Products 功能描述:CHRGR LI-ION 800MA 4.2V 8TDFN EP - Rail/Tube |
| MAX1508YETA+T | 功能描述:电池管理 Linear Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1508YETA-T | 功能描述:电池管理 Linear Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1508ZETA | 制造商:Maxim Integrated Products 功能描述:LINEAR LI+ BATT CHARGR W INTEGRATD - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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