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参数资料
| 型号： | MAX1838EEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC SW USB DUAL W/FB 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | USB，外设 |
| 电源电压： | 4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
Dual USB Switch with Fault Blanking
and Autoreset
Pin Description (continued)
PIN
15
16
NAME
ADJA
FAULTA
FUNCTION
Current-Limit Adjust for Channel A. When operating from auxiliary input, adjust the current limit by
connecting a resistor from ADJA to GND as shown in Programmable Current Limit .
Fault Indicator Output for Channel A. This open-drain output goes low when channel A is in
thermal shutdown or undervoltage lockout or in a sustained (>20ms) current-limit or short-circuit
condition.
Detailed Description
The MAX1838 is a dual, current-limited switch with
auxiliary inputs designed for USB applications. It has
two independent channels, each with its own fault-
blanking and autoreset function. Each channel has an
error flag output to notify the USB controller when the
current limit, short circuit, undervoltage lockout, or ther-
mal shutdown threshold is reached. A single input
enables both channels. The MAX1838 supplies the out-
puts from one of two inputs, IN or AUX, selected by
SEL (Table 1).
The MAX1838 operates from 4V to 5.5V input voltage
range and guarantees a 500mA (min) output current. A
0.9A built-in current limit limits the current in the event
of a heavy overload condition. When powering the
switches from the auxiliary input, each channel has an
adjustable current limit. The MAX1838 has independent
thermal shutdown for each channel in the event of a
prolonged overload or short-circuit condition. The
autoreset function monitors the overload and automati-
cally turns the switch on when the overload is removed.
Use of internal, low-R ON NMOS switches enables the
MAX1838 to provide four switches in the small 16-pin
QSOP package. Internal micropower charge pumps
THERMAL
SHUTDOWN A
FAULT LOGIC
20ms
FAULTA
N
generate the gate drive of these high-side switches.
Separate current limiting and thermal shutdown circuits
permit each switch to operate independently, improv-
ing system robustness.
BLANKING
Input Voltage Requirements and
Undervoltage Lockout
SEL
CHANNEL A CONTROL
CIRCUITRY
ADJA
The MAX1838 operates in one of three modes (Table 1).
The device receives its supply current from the AUX
input. When V AUX_ falls below the 3.8V undervoltage
AUX
IN
IC POWER
OUTA1
OUTA2
OUTB2
lockout voltage, the MAX1838 shuts down to prevent
erroneous switch operation.
Table 1. MAX1838 Operation Modes
OUTB1
Power from IN
(SEL high)
Both A and B outputs receive
current from IN. The IC is powered
from AUX.
ON
CHANNEL B CONTROL
CIRCUITRY
ADJB
FAULTB
Power from AUX
(SEL low)
Both A and B outputs receive
current from AUX. The IC is
powered from AUX. V IN_ may drop
20ms
BLANKING
N
to zero in this mode.
THERMAL
SHUTDOWN B
FAULT LOGIC
Full Shutdown
( ON high)
Both A and B outputs are open and
no power is available. Either V IN_ or
V AUX_ may drop to zero.
Figure 1. Simplified Functional Diagram
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1838EEE+ | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1838EEE+T | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1838EEE-T | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1839EEP | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX1839EEP+ | 功能描述:显示驱动器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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