MICREL MIC2536-2BM, MIC2536-1BM, MIC2536-2BMM, MIC2536-1BMM Datasheet
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 buspowered Universal Serial Bus (USB) applications. Few external 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 currentlimit 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 buspowered applications. Additional features include thermal
shutdown to prevent catastrophic switch failure from highcurrent loads and 3.3V and 5V logic compatible enable
inputs.
The MIC2536 is available in active-high and active-low versions in 8-lead SOP and MSOP.
Features
• Compliant to USB specifications
• 2.7V to 5.5V operating range
• 150mA minimum continuous load current per channel
• 400mΩ 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
Typical Application
4.50V to 5.25V
Upstream V
100mA max.
BUS
V
BUS
D+
D–
GND
4.7µF
Data
1.5k
MIC5207-3.3
IN OUT
GND
10k
10k
MIC2536-23.3V USB Controller
VIN
OVERCURRENT
1µF
OVERCURRENT
ON/OFF
ON/OFF
ENA OUTA
FLGA IN
FLGB GND
ENB OUTB
Typical Two-Port Bus-Powered Hub
0.1µF
63µF
63µF
Ferrite
Beads
Data
(Two Pair)
to USB
Controller
.01µF
.01µF
V
BUS
D+
D–
GND
V
BUS
D+
D–
GND
USB
Port 1
USB
Port 2
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
March 2000 1 MIC2536
MIC2536 Micrel
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
Pin Configuration
MIC2536-x
ENA
FLGA
1
2
8
7
OUTA
IN
FLGB
ENB
Pin Description
Pin Number Pin Name Pin Function
1 ENA Enable A (Input): Channel A control input. Active high (–1) or active low (–2)
2 FLGA Flag A: (Output): Channel A open-drain fault flag output. Indicates
3 FLGB Flag B (Output): Channel B open-drain fault flag output. Indicates overcur-
4 ENB Enable B (Input): Channel B control input. Active high (–1) or active low (–2)
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.
GND
3
4
6
5
OUTB
8-Lead SOP (M)
8-Lead MSOP (MM)
input.
overcurrent or thermal shutdown conditions. Overcurrent conditions must
last longer than tD in order to assert FLG.
rent or thermal shutdown conditions. Overcurrent conditions must last
longer than tD in order to assert FLG.
input.
MIC2536 2 March 2000
MIC2536 Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
Fault Flag Voltage (V
Fault Flag Current (I
Output Voltage (V
Output Current (I
Control Input (V
) .....................................................+6V
IN
)..............................................+6V
FLG
) ............................................25mA
FLG
) ..................................................+6V
OUT
)...............................Internally Limited
OUT
)................................... –0.3V to VIN +2V
EN
Operating Ratings (Note 2)
Supply Voltage (V
Ambient Operating Temperature (T
Thermal Resistance
SOP (θ
) ..........................................................160°C/W
JA
MSOP (θJA) .......................................................206°C/W
) ................................... +2.7V to +5.5V
IN
) ........ –40°C to +85°C
A
Storage Temperature (TS) ....................... –65°C to +150°C
Lead Temperature (Soldering 5 sec.) ....................... 260°C
ESD Rating, Note 3 ......................................................1kV
Electrical Characteristics
VIN = +5V; TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted
Parameter Condition Min Typ Max Units
Supply Current both switches off, OUTA–B = open, Note 4 0.75 5 µA
both switches on, OUTA–B = 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 VEN = 0V to 5.5V 0.01 1 µA
Enable Input Capacitance Note 5 1pF
Switch Resistance single switch, I
Output Turn-On Delay, t
ON
Output Turn-On Rise Time, t
Output Turnoff Delay, t
Output Turnoff Fall Time, t
OFF
F
R
RL = 50Ω, CL = 1µF 1.5 ms
RL = 50Ω, CL = 1µF 1.4 ms
RL = 50Ω, CL = 1µF130µs
RL = 50Ω, CL = 1µF115µs
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
Current Limit Response V
Flag Response Delay, t
D
= 0V to I
OUT
VIN = 5V, apply V
VIN = 3.3V, apply V
Overtemperature Shutdown TJ increasing, Note 5 135 °C
Threshold TJ decreasing, Note 5 125 °C
Error Flag Output Resistance VIN = 5V, IL = 10mA 10 20 Ω
VIN = 3.3V, IL = 10mA 15 30 Ω
Error Flag Off Current V
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, 1.5kΩ 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.
= 5V 0.01 1 µA
FLAG
= 100mA 400 700 mΩ
OUT
= 0V 150 275 400 mA
OUT
OUT
= I
OUT
(short applied to output), Note 5 10 µs
LIMIT
= 0V until FLG low 5 13 20 ms
= 0V until FLG low 13 ms
OUT
March 2000 3 MIC2536
MIC2536 Micrel
Test Circuit
V
Device
Under
Test
OUT
C
R
L
L
OUT
Functional Characteristics Test Circuit
Timing Diagrams
t
r
V
OUT
90%
10%
90%
10%
t
f
Output Rise and Fall Times
V
EN
V
OUT
50%
t
ON
90%
t
OFF
10%
Active-High Switch Delay Times (MIC2536-1)
V
EN
50%
t
OFF
t
ON
V
OUT
90%
10%
Active-Low Switch Delay Times (MIC2536-2)
MIC2536 4 March 2000
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