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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 18/22頁 |
| 文件大?。?/td> | 502K |
| 代理商： | MAX1538ETI |
M
Power-Source Selector for
Dual-Battery Systems
18
______________________________________________________________________________________
MOSFETs, they should be paired as shown in
Figure
6
for optimal power dissipation.
The MAX1538 provides asymmetric MOSFET gate
drive, typically turning MOSFETs on faster than they are
turned off. The t
TRANS
timer ensures that the MOSFETs
that are turning on begin to turn on 10μs after those
MOSFETs that are turning off begin to turn off. Choose
MOSFETs with low enough gate charge that all off-tran-
sitioning MOSFETs turn off before any on-transitioning
MOSFET turns on. Use the following equations to esti-
mate the worst-case turn-on and turn-off times:
where t
ON
is the turn-on time, t
OFF
is the turn-off time,
Q
G
is the MOSFET’s total gate charge specified at volt-
age V
G
, I
OFF1
is the 18mA (min) gate current when dri-
ving the gate from 7.5V gate drive to 2V gate drive,
V
1
is the voltage change during the 18mA gate drive
(5.5V), I
OFF2
is 3mA gate current when driving the gate
from 2V to 0V,
V
2
is the 2V change, and I
ON
is the
turn-on current.
The MAX1538’s gate-drive current is nonlinear and is a
function of gate voltage. For example, the gate driver
slows down as the MOSFET approaches off. See the
Typical Operating Characteristics
for a scope shot
showing MAX1538 turn-on and turn-off times when dri-
ving FDS6679 MOSFETs. The MAX1538 typically turns
the FDS6679 on in 0.7μs and off in 1μs.
Combining the MAX1538 with a Charger
To configure the MAX1538 for use with a step-down
charger, use the circuit of Figure 7. Connect the charg-
er’s power input to EXTLD. Do not connect the charg-
er’s power input to ADPIN. This ensures that the
charger does not bias ADPIN through its high-side
MOSFET.
System Holdup Capacitor
C
SYS
must be capable of sustaining the maximum sys-
tem load during the transition time between source
selection. Size the capacitor so that:
where t
MINV
is the battery undervoltage comparator
delay, t
TRANS
is the fixed time between switching
MOSFETs off and switching MOSFETs on, t
ON
is the
time to turn a MOSFET on (see the
MOSFET Selection
section), V
MINV
is the lower of V
MINVA
and V
MINVB
,
I
SYS_MAX
is the maximum system load, V
SYS_MIN
is the
minimum allowable system voltage before system
5
×
I
SYS MAX
_
+
+
(
)
×
>
V
t
t
t
C
V
MINV
MINV
TRANS
ON
SYS
SYS MIN
_
t
Q
V
V
I
V
I
Q
V
k
t
Q
V
V
I
Q
V
k
ON
G
G
OFF
OFF
G
G
ON
G
G
ON
G
G
=
+
=
×
=
×
=
×
1
1
2
2
0 93
.
5
0 25
.
MAX1538
MAX1908
MAX1909 OR
MAX1535
REVBLK
CHGIN
ADPIN
DCIN
P2
C
SYS
C2
EXTLD
ADPBLK
P3
SYSTEM LOAD
CSSP
CSSN
1
μ
F
BATT
ADAPTER
C
ADAPTER
Figure 7. Combining the MAX1538 with a Charger
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相關代理商/技術參數(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 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX153C/D | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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