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| 型号： | MAX8934AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHARGER DUAL 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Smart Power Selector™ |
| 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： | 4.1 V ~ 6.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
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MAX8934A–MAX8934E
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
Table 1. External Components List for Figures 2 and 3
COMPONENT
(Figures 2 and 3)
C DC
C VL
C SYS
C BATT
C CT
C LDO
R PU (x5)
THM
R THMSW
R PSET
R ISET
FUNCTION
DC filter capacitor
V L filter capacitor
SYS output bypass capacitors
Battery bypass capacitor
Charger timing capacitor
LDO output capacitor
Logic-output pullup resistors
Negative TC thermistor
THM pullup resistor
DC input current-limit programming resistor
Fast-charge current programming resistor
PART NUMBER
10 F F ± 10%, 16V X5R ceramic capacitor (0805)
Taiyo Yuden EMK212BJ106KG
0.1 F F ± 10%, 10V X5R ceramic capacitor (0402)
Taiyo Yuden LMK105BJ104KV
10 F F ± 10%, 6.3V X5R ceramic capacitor (0805)
Taiyo Yuden JMK212BJ106KD
4.7 F F ± 10%, 6.3V X5R ceramic capacitor (0805)
Taiyo Yuden JMK212BJ475KD
0.068 F F ± 10%, 16V X5R ceramic capacitor (0402)
Taiyo Yuden EMK105BJ683KV
1 F F ± 1 0%, 6.3V X5R ceramic capacitor (0402)
Taiyo Yuden JMK105BJ105KV
1M I ± 5% resistor
Vishay NTC Thermistor P/N NTHS0603N01N1003FF
100k I
1.5k I ± 1% for 2A limit
3k I ± 1% for 1A charging
Detailed Description
The MAX8934_ is a dual-input linear charger with
Smart Power Selector that safely charges a single Li+/
Li-Poly cell in accordance with JEITA specifications*.
The MAX8934_ integrates power MOSFETs and control
circuitry to manage power flow in portable devices. See
Figure 1. The charger has two power inputs, DC and
USB. These can be separately connected to an AC
adapter output and a USB port, or the DC input could be
a single power input that connects to either an adapter
or USB. Logic inputs, PEN1 and PEN2, select the cor-
rect current limits for two-input or single-input operation.
Figure 2 is the typical application circuit using separate
DC and USB connectors. Figure 3 is the typical applica-
tion circuit using a 5-pin USB connector or another DC/
USB common connector.
In addition to charging the battery, the MAX8934_ also
supplies power to the system through the SYS output.
The charging current is also provided from SYS so that
the set input current limit controls the total SYS current,
where total SYS current is the sum of the system load
current and the battery-charging current. SYS is pow-
ered from either the DC input pin or the USB sources
input pin. If both the DC and USB sources are con-
nected, DC takes precedence.
In some instances, there may not be enough adapter
current or USB current to supply peak system loads. The
MAX8934_ Smart Power Selector circuitry offers flexible
power distribution from an AC adapter or USB source
to the battery and system load. The battery is charged
with any available power not used by the system load.
If a system load peak exceeds the input current limit,
supplemental current is taken from the battery. Thermal
limiting prevents overheating by reducing power drawn
from the input source.
The MAX8934_ features an overvoltage limiter at SYS. If
the DC or USB input voltage exceeds the SYS regulation
voltage, V SYS does not follow V DC or V USB , but remains
at its regulation voltage. The MAX8934_ has numerous
other charging and power-management features that are
detailed in the following sections.
A 3.3V ultra-low quiescent current, always-on LDO pro-
vides up to 30mA for indicator LEDs and for backup
power to the system. This LDO powers the thermistor
monitor circuitry and provides bias to the external pullup
resistor for the thermistor.
* JEITA (Japan Electronics and Information Technology Industries Association) Standard, A Guide to the Safe Use of Secondary
Lithium Ion Batteries on Notebook–Type Personal Computers, April 20, 2007.
Maxim Integrated
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8934BETI+ | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8934BETI+ | 制造商:Maxim Integrated Products 功能描述:IC BATTERY CHARGER DUAL 28TQFN |
| MAX8934BETI+T | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8934CETI+ | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8934CETI+ | 制造商:Maxim Integrated Products 功能描述:IC BATTERY CHARGER DUAL 28TQFN 制造商:Maxim Integrated Products 功能描述:IC, BATTERY CHARGER, DUAL, 28TQFN |
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