March 2000 1 MIC2536
MIC2536 Micrel
MIC2536
Dual USB Power Distribution Switch
Final 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.
Typical Application
ENA OUTA
FLGA IN
FLGB GND
ENB OUTB
MIC2536-23.3V USB Controller
0.1µF
V
BUS
D+
D–
GND
Data
(Two Pair)
V
BUS
D+
D
GND
USB
Port 2
USB
Port 1
MIC5207-3.3
63µF
63µF
Ferrite
Beads
4.50V to 5.25V
Upstream V
BUS
100mA max.
V
BUS
D+
D
GND
Data
4.7µF
1µF
to USB
Controller
1.5k
ON/OFF
OVERCURRENT
OVERCURRENT
ON/OFF
VIN
10k
IN OUT
GND
.01µF
.01µF
10k
Typical Two-Port Bus-Powered Hub
Features
Compliant to USB specifications
2.7V to 5.5V operating range
150mA minimum continuous load current per channel
400m 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 body diode)
Soft-start circuit
100µA maximum on-state supply current
<1µA typical off-state supply current
•–40°C to 85°C operation
Applications
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
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
UL Recognized Component
MIC2536 2 March 2000
MIC2536 Micrel
Pin Description
Pin Number Pin Name Pin Function
1 ENA Enable A (Input): Channel A control input. Active high (1) or active low (2)
input.
2 FLGA Flag A: (Output): Channel A open-drain fault flag output. Indicates
overcurrent or thermal shutdown conditions. Overcurrent conditions must
last longer than t
D
in order to assert FLG.
3 FLGB Flag B (Output): Channel B open-drain fault flag output. Indicates overcur-
rent or thermal shutdown conditions. Overcurrent conditions must last
longer than t
D
in order to assert FLG.
4 ENB Enable B (Input): Channel B control input. Active high (1) or active low (2)
input.
5 OUTB Output B: Channel B switch output.
6 GND Ground
7 IN Positive Switch and Logic Supply Input
8 OUTA Output A: Channel A switch output.
Pin Configuration
1
2
3
4
8
7
6
5
OUTA
IN
GND
OUTB
ENA
FLGA
FLGB
ENB
MIC2536-x
8-Lead SOP (M)
8-Lead MSOP (MM)
Ordering Information
Part Number Enable Temperature Range Package
MIC2536-1BM Active High 40°C to +85°C 8-Lead SOP
MIC2536-2BM Active Low 40°C to +85°C 8-Lead SOP
MIC2536-1BMM Active High 40°C to +85°C 8-Lead MSOP
MIC2536-2BMM Active Low 40°C to +85°C 8-Lead MSOP
March 2000 3 MIC2536
MIC2536 Micrel
Electrical Characteristics
V
IN
= +5V; T
A
= 25°C, bold values indicate 40°C T
A
+85°C; unless noted
Parameter Condition Min Typ Max Units
Supply Current both switches off, OUTAB = open, Note 4 0.75 5 µA
both switches on, OUTAB = open, Note 4 60 100 µA
Enable Input Threshold low-to-high transition, Note 4 1.7 2.4 V
high-to-low transition, Note 4 0.8 1.5 V
Enable Input Current V
EN
= 0V to 5.5V 0.01 1 µA
Enable Input Capacitance Note 5 1pF
Switch Resistance single switch, I
OUT
= 100mA 400 700 m
Output Turn-On Delay, t
ON
R
L
= 50, C
L
= 1µF 1.5 ms
Output Turn-On Rise Time, t
R
R
L
= 50, C
L
= 1µF 1.4 ms
Output Turnoff Delay, t
OFF
R
L
= 50, C
L
= 1µF 130 µs
Output Turnoff Fall Time, t
F
R
L
= 50, C
L
= 1µF 115 µs
Output Leakage Current each output (switch off) 1 10 µA
Current Limit Threshold ramped load applied to enable output 500 mA
Short Circuit Current Limit each output (enabled into load), V
OUT
= 0V 150 275 400 mA
Current Limit Response V
OUT
= 0V to I
OUT
= I
LIMIT
(short applied to output), Note 5 10 µs
Flag Response Delay, t
D
V
IN
= 5V, apply V
OUT
= 0V until FLG low 5 13 20 ms
V
IN
= 3.3V, apply V
OUT
= 0V until FLG low 13 ms
Overtemperature Shutdown T
J
increasing, Note 5 135 °C
Threshold T
J
decreasing, Note 5 125 °C
Error Flag Output Resistance V
IN
= 5V, I
L
= 10mA 10 20
V
IN
= 3.3V, I
L
= 10mA 15 30
Error Flag Off Current V
FLAG
= 5V 0.01 1 µA
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4. Off is 0.8V and on is 2.4V for the MIC2536-1. Off is 2.4V and on is 0.8V for the MIC2536-2. The enable input has approximately
200mV of hysteresis.
Note 5. Guaranteed by design. Not production tested.
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
IN
) .....................................................+6V
Fault Flag Voltage (V
FLG
)..............................................+6V
Fault Flag Current (I
FLG
) ............................................25mA
Output Voltage (V
OUT
) ..................................................+6V
Output Current (I
OUT
) ............................... Internally Limited
Control Input (V
EN
)................................... 0.3V to V
IN
+2V
Storage Temperature (T
S
) ....................... 65°C to +150°C
Lead Temperature (Soldering 5 sec.) ....................... 260°C
ESD Rating, Note 3 ...................................................... 1kV
Operating Ratings (Note 2)
Supply Voltage (V
IN
) ................................... +2.7V to +5.5V
Ambient Operating Temperature (T
A
) ........ 40°C to +85°C
Thermal Resistance
SOP (θ
JA
) ..........................................................160°C/W
MSOP (θ
JA
) .......................................................206°C/W

MIC2536-1YMM

Mfr. #:
Manufacturer:
Microchip Technology / Micrel
Description:
Power Switch ICs - Power Distribution Dual USB Switch
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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