MIC2536
Micrel
MIC2536
Dual USB Power Distribution Switch
Preliminary Information
General Description
The MIC2536 is a cost-effective high-side power switch, with
two independently controlled channels, optimized for bus-
powered Universal Serial Bus (USB) applications. Few exter-
nal components are necessary to satisfy USB requirements.
Each switch channel of the MIC2536 will supply up to 100mA
as required for USB bus-powered downstream devices. Fault
current is limited to typically 275mA by fast-acting current-
limit circuitry which minimizes voltage droop on the upstream
port during fault conditions. A flag output with transient filter
indicates fault conditions to the local USB controller but will
ignore short flag signals resulting from inrush current during
hot plug-in events.
Soft start eliminates the momentary voltage droop on other
ports 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 MIC2536 is available in active-high and active-low ver-
sions in 8-lead SOP and MSOP.
Features
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Compliant to USB specifications
2.7V to 5.5V operating range
150mA minimum continuous load current per channel
400m鈩?typical on-resistance
Fast-acting short circuit protection with
thermal shutdown
Integrated filter eliminates
false overcurrent flag assertions
Individual open-drain fault flag pins with transient filter
3V/5V-compatible enable inputs
Active-high (-1) and active-low (-2) versions
Reverse-current blocking in off mode (no 鈥渂ody diode鈥?
Soft-start circuit
100碌A maximum on-state supply current
<1碌A typical off-state supply current
鈥?0擄C to 85擄C operation
USB keyboard bus-powered hubs
USB bus-powered docking stations
Note Book PCs
PDAs
General purpose power distribution applications
PC board hot swap
Inrush current-limiting
Applications
Typical Application
10k
4.50V to 5.25V
Upstream V
BUS
100mA max.
V
BUS
D+
D鈥?/div>
GND
4.7碌F
1.5k
MIC5207-3.3
IN
OUT
GND
1碌F
10k
3.3V USB Controller
VIN
ON/OFF
OVERCURRENT
OVERCURRENT
ON/OFF
MIC2536-2
ENA
FLGA
FLGB
ENB
OUTA
IN
GND
OUTB
63碌F
0.1碌F
Ferrite
Beads
V
BUS
D+
.01碌F
D鈥?/div>
GND
USB
Port 1
V
BUS
D+
.01碌F
63碌F
D鈥?/div>
GND
Data
(Two Pair)
to USB
Controller
USB
Port 2
Data
Typical Two-Port Bus-Powered Hub
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
March 2000
1
MIC2536
MIC2536-1BM 產(chǎn)品屬性
95
集成電路 (IC)
PMIC - 電源分配開關
-
USB 開關
2
700 毫歐
是
275mA
2.7 V ~ 5.5 V
-40°C ~ 85°C
表面貼裝
8-SOIC（0.154"，3.90mm 寬）
8-SOIC
管件
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