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参数资料
| 型号： | MAX1694EUB |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | USB Current-Limited Switches with Fault Blanking |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | MICRO MAX PACKAGE-10 |
| 文件页数： | 7/8页 |
| 文件大小： | 143K |
| 代理商： | MAX1694EUB |
M
USB Current-Limited Switches
with Fault Blanking
_______________________________________________________________________________________
7
momentary short-circuit faults that occur when hot-
swapping a capacitive load, and also ensures that no
fault is issued during power-up. When a load transient
causes the device to enter current limit, an internal
counter starts. If the load fault persists beyond the
10ms fault-blanking timeout, the
FAULT
output asserts
low. Ensure that the MAX1693/MAX1694’s input is ade-
quately bypassed to prevent input glitches from trigger-
ing spurious
FAULT
outputs. Input voltage glitches less
than 150mV will not cause a spurious
FAULT
output.
Load-transient faults less than 10ms (typ) will not cause
a
FAULT
output assertion.
Only current-limit faults are blanked. Die overtempera-
ture faults and input voltage droops below the UVLO
threshold will cause an immediate fault output.
Fault Latching (MAX1694 Only)
The MAX1694 features a latched
FAULT
output.
Whenever the
FAULT
output is activated, it latches the
FAULT
output low and also turns the switch off. To clear
the latch, either cycle the
ON
input or cycle the input
voltage below UVLO.
Applications Information
Input Capacitor
To limit the input voltage drop during momentary output
short-circuit conditions, connect a capacitor from IN to
GND. A 1μF ceramic capacitor will be adequate for most
applications; however, higher capacitor values will fur-
ther reduce the voltage drop at the input. See Figure 2.
Output Capacitor
Connect a 0.1μF capacitor from OUT to GND. This cap-
acitor helps prevent inductive parasitics from pulling
OUT negative during turn-off.
Layout and Thermal Dissipation
To optimize the switch-response time to output short-
circuit conditions, it is very important to keep all traces
as short as possible to reduce the effect of undesirable
parasitic inductance. Place input and output capacitors
as close to the device as possible (no more than 5mm).
All IN and all OUT pins must be connected with short
traces to the power bus. Wide power bus planes will
provide superior heat dissipation through the switch IN
and OUT pins. Figure 3 shows suggested pin connec-
tions for a single-layer board.
Under normal operating conditions, the package can
dissipate and channel heat away. Calculate the maxi-
mum power dissipation as follows:
P = (I
LIMIT
)
2
·
R
ON
where I
LIMIT
is the preset current limit (1.0A max) and
R
ON
is the on-resistance of the switch (125m
max).
When the output is short-circuited, foldback-current lim-
iting activates and the voltage drop across the switch
equals the input supply. The power dissipated across
the switch increases, as does the die temperature. If the
fault condition is not removed, the thermal-overload-pro-
tection circuitry activates (see the Thermal Shutdown
section). Wide power-bus planes connected to IN and
OUT and a ground plane in contact with the device will
help dissipate additional heat.
1
2
3
4
5
10
9
8
7
6
OUT
IN
OUT
FAULT
OUT
IN
OUT
IN
MAX1693
MAX1694
GND
ON
Figure 3. IN and OUT Cross Connections for a Single-Layer
Board
Figure 2. Typical Application Circuit
Chip Information
TRANSISTOR COUNT: 715
MAX1693
MAX1694
IN
OUTPUT
OUT
INPUT
+2.7V TO +5.5V
FAULT
ON
ON
OFF
100k
1
μ
F
0.1
μ
F*
*USB SPECIFICATIONS REQUIRE A LARGER CAPACITOR
GND
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| MAX1697R | 60mA, SOT23 Inverting Charge Pump with Shutdown |
| MAX1697REUT-T | 60mA, SOT23 Inverting Charge Pump with Shutdown |
| MAX1697S | 60mA, SOT23 Inverting Charge Pump with Shutdown |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1694EUB+ | 功能描述:电源开关 IC - USB USB Current-Limited 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 |
| MAX1694EUB+T | 功能描述:电源开关 IC - USB USB Current-Limited 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 |
| MAX1694EUB-T | 功能描述:电源开关 IC - USB USB Current-Limited 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 |
| MAX1694EUB-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX16950AAUE/V+ | 功能描述:DC/DC 开关控制器 2MHz Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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