- 您现在的位置：买卖IC网 > PDF目录16238 > MAX1538ETI+ (Maxim Integrated Products)IC PWR SOURCE SELECTOR 28-TQFN PDF资料下载
参数资料
| 型号： | MAX1538ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/22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
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:
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
? = V
t ON =
Q G ? ? V 1
?
V G ? I OFF 1
+
? V 2 ? Q G
I OFF 2 ? G
× 0 . 93 k ?
MOSFET.
System Holdup Capacitor
C SYS must be capable of sustaining the maximum sys-
t ON =
Q G 5 V Q G
× = × 0 . 25 k ?
V G I ON V G
tem load during the transition time between source
selection. Size the capacitor so that:
5 × V MINV ? ( t MINV + t TRANS + t ON ) ×
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-
I SYS _ MAX
C SYS
> V SYS _ MIN
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
1 μ F
MAX1908
MAX1909 OR
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
ADAPTER
C ADAPTER
MAX1538
ADPIN
DCIN
MAX1535
P2
REVBLK
SYSTEM LOAD
C SYS
CSSN
C2
CSSP
EXTLD
P3
ADPBLK
BATT
CHGIN
Figure 7. Combining the MAX1538 with a Charger
18
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| UBT1E222MHD | CAP ALUM 2200UF 25V 20% RADIAL |
| ECO-S2GA391EA | CAP ALUM 390UF 400V 20% SNAP |
| SLP391M180A3P3 | CAP ALUM 390UF 180V 20% SNAP |
| DS2781E+ | IC FUEL GAUGE BATT 8TSSOP |
| EBM15DSEF-S243 | CONN EDGECARD 30POS .156 EYELET |
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 |
发布紧急采购，3分钟左右您将得到回复。