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参数资料
| 型号： | MAX1538ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/22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
CHG Control
Toggle CHG to enable the charge path to the battery.
Charge control is overridden by RELRN (see the Battery
Relearn Mode section) or airline mode (see the Airline
Mode and AC Adapter section). When CHG is enabled,
the MAX1538 connects the selected battery (BATSEL = 0
for battery A and BATSEL = 1 for battery B) to the charg-
er. OUT[2:1] = 11 if the MAX1538 is in charge mode.
When the charge path is enabled, the corresponding
battery undervoltage latch is cleared. This allows charg-
ing of protected battery packs. In typical applications,
connect CHRG to VDD to reduce the system I/O.
Single Transition Break-Before-Make
Selection
The MAX1538 guarantees that no supplies are connect-
ed to each other during any transition by implementing
a fixed delay time (t TRANS , the break-before-make tran-
sition timer). This is necessary as the batteries have very
low impedances, and momentarily shorting batteries
together can cause hundreds of amps to flow. For
example, when adapter removal is detected, ADPPWR
and REVBLK begin to turn off less than 10μs before
ADPBLK and DISBAT begin to turn on, connecting the
appropriate battery. For example, upon switching from
case the system holdup capacitor is not large enough
to sustain the system load.
Battery insertion is automatically debounced using the
battery-insertion blanking time (t BBLANK ). A battery is
not discharged unless the battery has been above the
5 x V MINV threshold for 21ms (typ). After t BBLANK is
expired, V BAT_ must exceed 5 x V MINV_ or the battery
is detected as undervoltage.
Applications Information
MOSFET Selection
Select P-channel MOSFETs P1–P8 according to their
power dissipation, R DSON , and gate charge. Each
MOSFET must be rated for the full system load current.
Additionally, the battery discharge MOSFETs (P3, P5,
P6, P7, and P8) should be selected with low on-resis-
tance for high discharge efficiency. Since for any given
switch configuration at least half of the MOSFETs are
off, dual MOSFETs can be used without reducing the
effective MOSFET power dissipation. When using dual
ADAPTER
one battery to another, DISA and CHGA begin turning
off less than 10μs before DISB and CHGB begin to turn
on. To guarantee a break-before-make time, ensure that
the turn-off time of the MOSFETs is smaller than t TRANS
(see the MOSFET Selection section).
The MAX1538 also guarantees that any change does
not cause unnecessary power-source transitions. When
FOR RELEARN
MODE ONLY
STEP-DOWN
BATTERY CHARGER
P1
P2
ADPIN
ADPPWR
MAX1538
REVBLK
switching from battery to battery; battery to adapter; or
adapter to battery because of adapter or battery inser-
tion or removal, or due to a change at BATSEL, a single
SYSTEM LOAD
IN
P3
EXTLD
ADPBLK
set of MOSFETs are turned off followed by another set
of MOSFETs turned on. No additional transitions are
necessary. The only exception occurs when RELRN is
high and the adapter is inserted because it is first
OUT
DUAL
FDS4935A
CHGIN
detected as an airline adapter and later detected as an
AC adapter. This results in a transition from discharge
DUAL
FDS4935A
P7
P6
CHGA
mode to AC mode, followed by a transition from AC
mode to relearn mode. Although this extra transition is
generally harmless, it can be avoided by disabling
CHGB
DISB
relearn mode when the adapter is absent.
DUAL
FDS4935A
P8
P5
DISA
Blanking
The MAX1538 implements sophisticated blanking at the
adapter and the batteries to correctly determine bat-
BATB
BATA
tery/adapter insertion and removal. Logic inputs CHRG,
RELRN, and BATSEL should be debounced to ensure
BATTERY B
BATTERY A
that fast repetitive transitions do not occur, in which
Figure 6. Optimal Use of Power Dissipation Using Dual
MOSFETs
______________________________________________________________________________________
17
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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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