參數(shù)資料
型號(hào)： MAX1538ETI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 電源管理
英文描述： Power-Source Selector for Dual-Battery Systems
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC28
封裝： 5 X 5 MM, 0.80 MM HEIGHT, MO-220WHHD-1, TQFN-28
文件頁(yè)數(shù)： 19/22頁(yè)
文件大?。?/td> 502K
代理商： MAX1538ETI
M
Power-Source Selector for
Dual-Battery Systems
______________________________________________________________________________________
19
crash, and C
SYS
is the total system holdup capaci-
tance, which does not need to be near the MAX1538.
The timing related to the system holdup capacitance is
shown in Figure 8.
Charger output capacitance contributes to C
SYS
for the
step-down charger topology (Figure 1), but not for the
step-up/step-down charger topology (Figure 2).
Leakage Current into BAT_
Leakage current into BATA or BATB can interfere with
proper battery-removal detection. D1 and D2 must be
low leakage to ensure that battery removal is properly
detected. Choose MOSFETs P6 and P7 with low off-
leakage current. Board leakage current can also be a
problem. For example, neighbor pins BATA and
BATSUP should have greater than 50M
impedance
between each other. Proper battery-removal detection
requires that:
where I
Board
is board leakage current, I
DS_OFF
is the
off-leakage current of MOSFETs P6 and P7, I
D_Leakage
is the reverse leakage current of the diodes, and
I
BAT_Sink@2V
is the BAT_ leakage current at 2V (0.4μA;
see the
Typical Operating Characteristics
).
Inductive “Kick”
When the adapter or a battery is delivering a significant
current to the system and that path is disabled (typical-
ly to enable another path), a voltage spike is generated
at the source. This is due to a parasitic inductance
shown in Figure 9. When the adapter is disconnected, a
positive voltage spike occurs at ADPIN. When a dis-
charging battery is disconnected, a positive voltage
spike occurs at BAT_. Connect a capacitor from BAT_
or ADPIN to GND to limit this inductive kick. Choose the
source capacitance according to the following equation:
where V
SOURCE
is the maximum DC voltage of the
source in question, I
SYS_MAX
is the maximum system
load, and L
SOURCE
(parasitic inductance) and
C
SOURCE
are shown in Figure 9.
During battery charge, the voltage spike during battery
disconnect is negative. To ensure that this negative
voltage spike does not go below 0V, choose C
BAT_
according to the following equation:
C
L
I
V
BAT
BAT
CHG MAX
_
BAT
MIN
_
_
__
>
×
2
2
C
L
I
V
SOURCE
SOURCE
SYS MAX
_
SOURCE
×
>
2
2
2
30
I
I
I
I
I
I
Board
DS OFF P
_
DS OFF P
_
D
leakage
D
leakage
BAT Sink
_
V
+
+
+
+
<
(
)
(
)
_
_
@
6
7
1
2
2
ADPBLK/REVBLK
REVBLK/ADPBLK
t
OFF
t
TRANS
t
ON
V
SYS_MIN
OTHER POWER SOURCE
EXTLD
5 x V
MINV
OR AC/AIR THRESHOLD
t
MINV
OR t
ADP
Figure 8. System Holdup Capacitor Timing
TO BATTERY
OR ADAPTER
PARASITIC
INDUCTANCE
(L
SOURCE
)
I
SOURCE
C
SOURCE
MAX1538
Figure 9. Inductive Kick Upon Source Disconnect
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1538ETI+ 功能描述:電池管理 Power-Source Select for Dual-Bat System RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1538ETI+T 功能描述:電池管理 Power-Source Select for Dual-Bat System RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1538ETI-T 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1538EVKIT 功能描述:電源管理IC開(kāi)發(fā)工具 MAX1538EVKIT RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
MAX153C/D 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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