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MIC2537-1BM 参数 Datasheet PDF下载

MIC2537-1BM图片预览
型号: MIC2537-1BM
PDF下载: 下载PDF文件 查看货源
内容描述: 四配电开关的初步信息 [Quad Power Distribution Switch Preliminary Information]
分类和应用: 开关
文件页数/大小: 12 页 / 90 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
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MIC2537
Micrel
MIC2537
Quad Power Distribution Switch
Preliminary Information
General Description
The MIC2537 is a cost-effective high-side power switch with
four independently controlled channels, optimized for bus-
powered Universal Serial Bus (USB) applications. Few exter-
nal components are necessary to satisfy USB requirements.
The MIC2537 satisfies the following USB requirements: each
switch channel supplies up to 100mA as required by USB
bus-powered downstream devices; fault current is limited to
typically 250mA, well below the UL 25VA safety require-
ments; and a flag output is available to indicate fault condi-
tions to the local USB controller. Soft start eliminates the
momentary voltage drop on the upstream port that may occur
when the switch is enabled in bus-powered applications.
Additional features include thermal shutdown to prevent
catastrophic switch failure from high-current loads and 3.3V
and 5V logic compatible enable inputs.
The MIC2537 is available in active-high and active-low ver-
sions in a 16-lead SOP package.
Features
Compliant to USB specifications
3V to 5.5V input
100mA minimum continuous load current per port
425mΩ typical on-resistance
< 400mA current limit
Individual open-drain fault flag leads
3V/5V-compatible enable inputs
Active-high (-1) and active-low (-2) versions
100µA max. on-state supply current
<1µA typical off-state supply current
16-lead SOP package
–40°C to 85°C operation
Applications
USB keyboards
USB bus-powered docking stations
Notebook docking stations
Notebook PCs
PDA
General power distribution
Typical Application
Upstream V
BUS
4.75V to 5.25V
500mA max.
10k
MIC5207-3.3
LDO Regulator
IN
4.7
µF
OUT
1µF
GND
3.3V USB Controller
V+
EN
OC
EN
OC
EN
D+
D–
Bold
lines indicate
0.1" wide, 1-oz. copper
high-current traces.
GND
OC
EN
OC
Ferrite
Bead
10k 10k 10k
MIC2537
ENA
FLGA
ENB
FLGB
ENC
FLGC
END
FLGD
IN
NC
OUTA
OUTB
OUTC
OUTD
NC
GND
V
BUS
33µF*
* 33µF, 16V tantalum or 100µF, 10V electrolytic per port
0.01µF
D+
D–
GND
Downstream
USB
Port 3
100mA max.
0.1
µF
33µF*
0.01µF
33µF*
0.01µF
V
BUS
D+
D–
GND
Downstream
USB
Port 1
100mA max.
V
BUS
D+
D–
GND
Downstream
USB
Port 2
100mA max.
V
BUS
33µF*
0.01µF
D+
D–
GND
Downstream
USB
Port 4
100mA max.
Typical Bus-Powered Hub
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
December 1999
1
MIC2537