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参数资料
| 型号： | MAX1538ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/22页 |
| 文件大小： | 0K |
| 描述： | IC PWR SOURCE SELECTOR 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 功能： | 双电池控制器 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 4.75 V ~ 28 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（5x5） |
| 包装： | 托盘 |
Power-Source Selector for
Dual-Battery Systems
where V BAT__MIN is the minimum battery voltage,
I CHG_MAX is the maximum charge current, and L BAT_ is
the battery’s inductance. C BAT_ values of 0.01μF are
adequate for typical applications. Adding capacitance
at BAT_ pins lengthens the time needed to detect bat-
tery removal. See the Battery-Absence-Detection Delay
section.
Adapter Removal Debouncing
Upon adapter removal the adapter’s connector may
bounce. To avoid false detection of adapter reinsertion
select R1, R2, and R3 according to the following equation:
Layout
The MAX1538 selector fits in a very small layout.
Ensure that C1 is placed close to V DD and GND.
Connect the paddle to GND directly under the IC. A
complete layout example is shown in Figure 10.
Because BATA and BATB are high-impedance nodes,
prevent leakage current between BATA/BATB and
other high-voltage sources by carefully routing traces.
Note that flux remaining on the board can significantly
contribute to leakage current. See the Leakage Current
into BAT_ section.
Minimize parasitic inductance in the BATA and BATB
C ADPIN ( Adapter ? V _ Threshold
R 1 + R 2 + R 3 <
V _ Threshold × t Bounce
× V
)
path to reduce inductive kick during battery discon-
nect. This reduces the capacitance requirement at
BATA and BATB.
where V Adapter is the AC-adapter voltage when remov-
ing an AC adapter and airline-adapter voltage when
removing an airline adapter, C ADPIN is the capacitance
at ADPIN, and t Bounce is the 5ms debounce time. See
the Airline Mode and AC Adapter section for a defini-
tion of V _Threshold .
Battery-Absence-Detection Delay
Pin Configuration
28 27 26 25 24 23 22
When a selected battery is removed, the system load
quickly pulls BAT_ below 5 x V MINV_ and another
MINVA 1
MINVB 2
21 N.C.
20 CHGB
source is selected. The battery is considered present
and undervoltage until V BAT_ falls below 2V. Although
another power source is quickly switched to the system
load, capacitance at BAT_ (see the Inductive "Kick"
section) delays the detection of the removed battery. If
another battery is inserted before this delay has
BATSEL 3
RELRN 4
CHRG 5
OUT0 6
OUT1 7
MAX1538 *
19 CHGA
18 DISBAT
17 CHGIN
16 EXTLD
15 N.C.
passed, it is considered undervoltage. Calculate the
delay using the following equation:
19 V × C BAT _
t Absence _ delay =
I BAT
where I BAT_ is the 3.9μA BAT_ quiescent current (due to
*EXPOSED PADDLE
8
9
10 11 12 13 14
THIN QFN
(5mm x 5mm)
a 5M ? internal resistor), and C BAT_ is the capacitance
from BAT_ to GND. When C BAT_ = 1μF, t Absence_delay
corresponds to a 5s time constant. If this time is unac-
ceptable, use a smaller capacitance or connect a resis-
tor or current sink from BAT_ to GND.
Chip Information
TRANSISTOR COUNT: 5431
PROCESS: BiCMOS
20
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1538ETI+ | 功能描述:电池管理 Power-Source Select for Dual-Bat System 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 |
| MAX1538ETI+T | 功能描述:电池管理 Power-Source Select for Dual-Bat System 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 |
| MAX1538ETI-T | 功能描述:电池管理 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 |
| MAX1538EVKIT | 功能描述:电源管理IC开发工具 MAX1538EVKIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX153C/D | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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