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參數(shù)資料
| 型號(hào)： | MAX1922ESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1A Current-Limited Switch for 2 USB Ports |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, SOIC-8 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 711K |
| 代理商： | MAX1922ESA |
M
1A Current-Limited Switch for 2 USB Ports
cause a spurious
OC
output. Load-transient faults less
than 10ms (typ) will not cause an
OC
output assertion.
Only current-limit faults are blanked. Die overtempera-
ture faults and input voltage droops below the UVLO
threshold will cause an immediate
OC
output.
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
further reduce the voltage drop at the input (Figure 2).
Output Capacitor
Connect a 0.1μF capacitor from OUT to GND. This
capacitor helps to prevent inductive parasitics from
pulling OUT negative during turn-off.
Layout and Thermal Dissipation
Important: Optimize the switch response time to output
short-circuit conditions by keeping all traces as short
as possible to reduce the effect of undesirable parasitic
inductance. Place input and output capacitors as close
as possible to the device (no more than 5mm away). All
IN and OUT pins must be connected with short traces
to the power bus. Wide power-bus planes will provide
superior heat dissipation through the MAX1922’s IN
and OUT pins.
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 (2.1A 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 voltage. The power dissipated
across the switch increases, as does the die tempera-
ture. If the fault condition is not removed, the thermal-
overload protection circuitry activates (see
Thermal
Shutdown
section). Wide power-bus planes connected
to IN and OUT and a ground plane in contact with the
device help dissipate additional heat.
Driving Inductive Loads
A wide variety of devices (mice, keyboards, cameras,
and printers) can load the USB port. These devices
commonly connect to the port with cables, which can
add an inductive component to the load. This induc-
tance causes the output voltage at the USB port to ring
during a load step. The MAX1922 is capable of driving
inductive loads, but avoid exceeding the device’s
absolute maximum ratings. Usually the load inductance
is relatively small, and the MAX1922 input includes a
substantial bulk capacitance from an upstream regula-
tor as well as local bypass capacitors, limiting over-
shoot. If severe ringing occurs due to large load
inductance, clamp the MAX1922 output below 6V and
above -0.3V.
Figure 2. Typical Application Circuit
MAX1922
IN
OUTPUT
OUT
INPUT
1
μ
F
0.1
μ
F*
*USB SPECIFICATIONS REQUIRE
A HIGHER VALUE CAPACITOR.
OVERCURRENT
OUTPUT
ON
100k
OFF
GND
OC
EN
Chip Information
TRANSISTOR COUNT: 715
PROCESS: BiCMOS
_______________________________________________________________________________________
7
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|---|---|
| MAX1922ESA+ | 功能描述:電源開關(guān) IC - USB 1A Crnt-Ltd Switch for 2 USB Ports RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1922ESA+C71073 | 功能描述:電源開關(guān) IC - USB 1A Crnt-Ltd Switch for 2 USB Ports RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1922ESA+T | 功能描述:電源開關(guān) IC - USB 1A Crnt-Ltd Switch for 2 USB Ports RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1922ESA-T | 功能描述:電源開關(guān) IC - USB 1A Crnt-Ltd Switch for 2 USB Ports RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1922ETB+ | 制造商:Maxim Integrated Products 功能描述:CURRENT LIMIT SW 1-IN 1-OUT 2.7V TO 5.5V 2.1A 10TDFN EP - Rail/Tube |
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