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| 型号： | ISL61853GCRZ |
| 厂商： | Intersil |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC USB PWR CTRLR DUAL 10DFN |
| 标准包装： | 100 |
| 类型： | 热交换开关 |
| 应用： | USB 过电流保护控制器 |
| 内部开关： | 是 |
| 电流限制： | 1.1A |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 管件 |
ISL6185
Introduction
The ISL6185 is a dual channel fully independent overcurrent (OC)
fault protection IC for the +2.5V to +5V environment. Each
ISL6185 incorporates in a single package two 85m Ω P-channel
MOSFET power switches for power control. Independent enabling
inputs and fault reporting outputs compatible with 2.5V to 5V
logic allow for external control and reporting. This device features
integrated power switches with current monitoring, accurate
current limiting, reverse bias protection and current limited
timed delay to turn-off for system reliability. See Figures 13
through 28 for typical operational waveforms including both
under-current and over-current situations.
The ISL6185 offers current sense and limiting, with V IN = 5V
guaranteed continuous current product variants of 0.6A, 1.1A, 1.5A
and 1.8A, making these devices well suited for a myriad of USB and
other low power (9W max) port power management applications
and configurations.
The ISL6185 also provides thermally insensitive timed OC turn-off
and fault notification. This isolates and protects the voltage bus in
the event of a peripheral OC event or short circuit event,
independent of the adjoining switch’s electrical or the ambient
thermal condition.
The ISL6185 undervoltage lockout feature prevents turn-on of
the outputs unless the correct ENABLE state and V IN > V UVLO
are present. During initial turn-on, the ISL6185 prevents fault
reporting by blanking the fault signal.
During operation, once an OC condition is detected, the output
is current limited for t CL to allow transient OC conditions to
pass. If still in current limit after the current limit period has
elapsed, the output is turned off, and the fault is reported by
pulling the corresponding FAULT output low. On the latch-off
options, after turn-off, both the output and the FAULT signal are
latched low until reset by the enable signal being de-asserted or
until a POR occurs. At this time, the FAULT signal clears, and
the switch is ready to be turned back on. On the auto restart
options, the ISL6185 attempts to periodically turn on the
output, as long as the enable is asserted.
When disabled, the ISL6185 has a low quiescent supply current
and an output-to-input reverse current flow blocking capability.
The ISL6185 family is provided with enable polarity options and
an industry-standard 8 lead SOIC pinout, along with two versions
in the 70% smaller 3x3 DFN. The 8 Ld DFN package offers the
same performance as the 8 Ld SOIC, whereas the 10 Ld DFN
offers higher current capability in the smallest possible package
because of lower package electrical and thermal resistance.
9
Functional Description
Power On Preset (POR)
The ISL6185 POR feature inhibits device functionality when
VIN < V UVLO .
Reverse Polarity Protection
In any event in which the power switch is disabled and
V OUT > V IN, there will be no output-to-input current flow, nor will
the output voltage appear on the input.
Soft-Start
Upon enable, the switch passes a constant current to the load.
The voltage on the VOUT pin ramps up according the equation,
I LIM /C OUT (V/s). Resistive or active load slows the V OUT ramp-up
toward the top of its curve.
Fault Blanking On Start-Up
During initial turn-on, the ISL6185 prevents nuisance faults from
being reported to the system controller by blanking the fault
signal until the internal FET is fully enhanced.
Current Trip and Limiting Levels
The ISL6185 provides integrated current sensing in the MOSFET
that allows for rapid control of OC events. Once an OC condition is
detected, the ISL6185 goes into its current limiting (CL) control
mode. The ISL6185 is variant specified to allow a continuous
current (I CONT ) operation of 0.6A, 1.1A, 1.5A or 1.8A. As the
current increases past its continuous current rating, it will reach
a level that causes the device to enter its current limit mode; that
is, the current trip level. The current trip level is in all cases
adequately above the I CONT rating so as not to cause unintended
false faults. The current limit is specified at V OUT = V IN - 1V to test
a known representative condition and is featured at a nominal
value slightly higher than the continuous current rating. The
speed of this current limiting control is inversely related to the
magnitude of the OC fault. Thus, a hard overcurrent is more
quickly pulled to its limiting value than a marginal OC condition.
Over-Temperature Shutdown
Although the ISL6185 has an over-temperature shutdown and
lockout feature, because of the 12ms timed shutdown, the
thermal shutdown is likely to be invoked only in extremely high
ambient temperatures.
The over-temperature protection invokes and disables the switch
turn-on operation once the die temperature is ~+140°C. It turns
off an already on switch at ~+150°C and releases the part to
operation once the die temperature falls to ~+120°C.
FN6937.3
March 8, 2012
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| ISL61853GIRZ-T | 功能描述:热插拔功率分布 DL USB HOTSWAP W/INT LW11A/LTCH 3X3 10LD RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| ISL61853HCRZ | 功能描述:热插拔功率分布 DL USB HOTSWAP W/INT LW11A/RTRY3X3 10LD RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| ISL61853HCRZ-T | 功能描述:热插拔功率分布 DL USB HOTSWAP W/INT LW11A/RTRY3X3 10LD RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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