參數(shù)資料
型號(hào)： MAX1538ETI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 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)： 20/22頁(yè)
文件大?。?/td> 502K
代理商： MAX1538ETI
M
Power-Source Selector for
Dual-Battery Systems
20
______________________________________________________________________________________
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:
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
When a selected battery is removed, the system load
quickly pulls BAT_ below 5 x V
MINV_
and another
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
passed, it is considered undervoltage. Calculate the
delay using the following equation:
where I
BAT_
is the 3.9μA BAT_ quiescent current (due to
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.
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
path to reduce inductive kick during battery discon-
nect. This reduces the capacitance requirement at
BATA and BATB.
Pin Configuration
Chip Information
TRANSISTOR COUNT: 5431
PROCESS: BiCMOS
t
V
C
I
Absence delay
BAT
BAT
_
_
×
=
19
R
R
R
V
t
C
V
V
Threshold
×
(
Bounce
ADPIN
Adapter
Threshold
1
2
3
+
+
×
_
_
<
)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
8
9
10
11
12
13
14
1
2
3
4
5
6
7
V
D
G
B
B
D
D
B
MINVA
MINVB
BATSEL
RELRN
CHRG
OUT0
OUT1
O
A
A
A
A
R
A
N.C.
CHGB
CHGA
DISBAT
CHGIN
EXTLD
N.C.
MAX1538
*
THIN QFN
(5mm x 5mm)
*EXPOSED PADDLE
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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開發(fā)工具 MAX1538EVKIT RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型: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 輸入類型:Differential 信噪比:107 dB 接口類型: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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