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参数资料
| 型号： | MAX8900DEWV+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 30/35页 |
| 文件大小： | 0K |
| 描述： | IC LI BATTERY CHARGER 1.2A WLP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 3.4 V ~ 6.3 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 30-WFBGA，WLBGA |
| 供应商设备封装： | 30-WLP |
| 包装： | 带卷 (TR) |
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MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
C BAT LOAD ×
t DONE2FC
capacitor (C BST ) is a 0.1 F F with a voltage rating of 10V or
greater. If C BST is increased then maintain a ratio of less
than 1:10 between C BST and C PVL . C BST stores charge
to drive the high-side n-channel gate. The minimum AVL
capacitor is 0.1 F F with a voltage rating of 6.3V. The mini-
mum PVL capacitor is 1.0 F F with a voltage rating of 6.3V.
Ceramic capacitors with X5R or X7R dielectric are highly
recommended due to their small size, low ESR, and small
temperature coefficients.
Applications Information
Dynamic Charge Current Programming
Certain applications require dynamic programming of the
charge current. For example, if the input supply is a USB
source, then the system might need to adjust the charge
current to support the 100mA and 500mA input current
ratings dictated by the USB-IF. Figure 2 illustrates one
approach to dynamically program the charge current. By
driving the gates of two MOSFET switches to logic-high
or logic-low, a microprocessor ( F P) connects or discon-
U The system must not draw load currents that are
greater than I PQ when the battery is less than V PQUTH .
U The thermistor node (THM) must be satisfied. Note
that if the thermistor is in the battery pack and the
pack is removed, the MAX8900_ THM node voltage
goes high and disables the charger. If the MAX8900_
is expected to deliver charge without a battery then
V THM must be forced to AVL/2.
U The battery node should have enough capacitance
to hold the battery voltage to some minimum accept-
able system value (V SYSRST ) during the done-to-fast-
charge state transition time of 100 F s (t DONE2FC ).
≥ I
V BATREG -V SYSRST
For example, if the maximum system load without a
battery could be 300mA (I LOAD ) and the minimum
acceptable system voltage is 3.4V (V SYSRST ), then
the battery node should have at least 37.5 F F.
nects different program resistors. This method allows for
four different charge current values ranging from 95mA
to 1187mA. When a MOSFET is turned on, its associated
C BAT ≥ 300mA ×
100 F s
4.2V - 3.4V
35.7 F F
=
resistor is connected to SETI. As resistors are added
in parallel, the total resistance from SETI to ground
decreases, which causes I FC to increase.
In the particular example of a USB input, the circuit of
Figure 2 could be leveraged as follows: When a VBUS
connect event is detected, the F P can immediately initi-
ate the USB 100mA current mode by setting GPIO[6:4]
= 0b000. After the USB transceiver has enumerated with
500mA permission, the F P can initiate the USB 500mA
current mode by setting GPIO[6:4] = 0b010. If the USB
transceiver detects that a USB suspend is needed, then
the F P can reduce the input current to 40 F A by set-
ting GPIO[6:4] = 0b001. Alternatively, it is possible that
after the VBUS connect event that the USB transceiver
determines that there is a dedicated USB wall charger
(D+ and D- shorted together) and then the F P can set
the charge current to the full capability of the MAX8900_
(1.2A) by setting GPIO[6:4] = 0b110.
No-Battery Operation
No-battery operation may be necessary in the applica-
tion and/or end-of-line testing during production. The
MAX8900_ can operate a system without a battery as
long as the following conditions are satisfied:
U The system must not draw load currents that are
greater than I FC .
30
Charge-Source Issues
A battery charger’s input is typically very accessible to
the end-user (i.e., available on a connector) and can
potentially be exposed to very harsh conditions. The
MAX8900_ provides for high-reliability solution that can
survive harsh conditions seen on its input.
Charge-Source Impedance
Charge source impedance can vary due to quality of
the charge source and the associated connectors. The
MAX8900_ operates very nicely with input impedance
up to 1 I . When high input impedances cause the input
voltage to drop, the MAX8900_ simply reduces the
charge current to a sustainable level and tries to put as
much energy into the battery as possible. If the input
voltage falls within the V IN2BAT threshold of the battery
voltage, the MAX8900_ shuts down to prevent any cur-
rent flowing from the battery back to the charger source.
The MAX8900_ does not suffer from the self-oscillation
problems that plague other chargers when exposed to
high-impedance sources.
Inductive Kick
Often the input source has long leads connecting to the
MAX8900_, which, during connection and disconnect,
can cause voltage spikes. The lead inductance and the
input capacitor create an LC tank circuit. In the event
that the LC tank circuit has a high Q (i.e., low series
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8901AETA+ | 制造商:Maxim Integrated Products 功能描述:HIGHEST EFFICIENCY SUPPLY 8TDFN EP - Rail/Tube |
| MAX8901AETA+T | 功能描述:LED照明驱动器 Supply for 2 to 6 Series WLEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8901BETA+ | 制造商:Maxim Integrated Products 功能描述:HIGHEST EFFICIENCY SUPPLY FOR 2 TO 6 SERIES WLEDS IN A - Rail/Tube |
| MAX8901BETA+CAR | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8901BETA+T | 功能描述:LED照明驱动器 Supply for 2 to 6 Series WLEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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