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.
Features
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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
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–
GND
4.7µF
1.5k
MIC5207-3.3
IN
OUT
GND
1µF
10k
3.3V USB Controller
VIN
ON/OFF
OVERCURRENT
OVERCURRENT
ON/OFF
MIC2536-2
ENA
FLGA
FLGB
ENB
OUTA
IN
GND
OUTB
63µF
0.1µF
Ferrite
Beads
V
BUS
D+
.01µF
D–
GND
USB
Port 1
V
BUS
D+
.01µF
63µF
D–
GND
Data
(Two Pair)
to USB
Controller
USB
Port 2
Data
Typical Two-Port Bus-Powered Hub
UL Recognized Component
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
MIC2536-1BM
MIC2536-2BM
MIC2536-1BMM
MIC2536-2BMM
Enable
Active High
Active Low
Active High
Active Low
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
8-Lead SOP
8-Lead SOP
8-Lead MSOP
8-Lead MSOP
Pin Configuration
MIC2536-x
ENA
FLGA
FLGB
ENB
1
2
3
4
8
7
6
5
OUTA
IN
GND
OUTB
8-Lead SOP (M)
8-Lead MSOP (MM)
Pin Description
Pin Number
1
2
Pin Name
ENA
FLGA
Pin Function
Enable A (Input): Channel A control input. Active high (–1) or active low (–2)
input.
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.
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.
Enable B (Input): Channel B control input. Active high (–1) or active low (–2)
input.
Output B: Channel B switch output.
Ground
Positive Switch and Logic Supply Input
Output A: Channel A switch output.
3
FLGB
4
5
6
7
8
ENB
OUTB
GND
IN
OUTA
MIC2536
2
March 2000
MIC2536
Micrel
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
Electrical Characteristics
V
IN
= +5V; T
A
= 25°C,
bold
values indicate –40°C
≤
T
A
≤
+85°C; unless noted
Parameter
Supply Current
Condition
both switches off, OUTA–B = open,
Note 4
both switches on, OUTA–B = open,
Note 4
Enable Input Threshold
low-to-high transition,
Note 4
high-to-low transition,
Note 4
Enable Input Current
Enable Input Capacitance
Switch Resistance
Output Turn-On Delay, t
ON
Output Turn-On Rise Time, t
R
Output Turnoff Delay, t
OFF
Output Turnoff Fall Time, t
F
Output Leakage Current
Current Limit Threshold
Short Circuit Current Limit
Current Limit Response
Flag Response Delay, t
D
Overtemperature Shutdown
Threshold
Error Flag Output Resistance
V
EN
= 0V to 5.5V
Note 5
single switch, I
OUT
= 100mA
R
L
= 50Ω, C
L
= 1µF
R
L
= 50Ω, C
L
= 1µF
R
L
= 50Ω, C
L
= 1µF
R
L
= 50Ω, C
L
= 1µF
each output (switch off)
ramped load applied to enable output
each output (enabled into load), V
OUT
= 0V
V
OUT
= 0V to I
OUT
= I
LIMIT
(short applied to output),
Note 5
V
IN
= 5V, apply V
OUT
= 0V until FLG low
V
IN
= 3.3V, apply V
OUT
= 0V until FLG low
T
J
increasing,
Note 5
T
J
decreasing,
Note 5
V
IN
= 5V, I
L
= 10mA
V
IN
= 3.3V, I
L
= 10mA
Error Flag Off Current
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Min
Typ
0.75
60
1.7
Max
5
100
2.4
Units
µA
µA
V
V
µA
pF
0.8
1.5
0.01
1
400
1.5
1.4
130
115
1
10
500
700
1
mΩ
ms
ms
µs
µs
µA
mA
mA
µs
150
275
10
400
5
13
13
135
125
10
15
0.01
20
ms
ms
°C
°C
Ω
Ω
µA
20
30
1
V
FLAG
= 5V
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
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.
Guaranteed by design. Not production tested.
March 2000
3
MIC2536
MIC2536
Micrel
Test Circuit
V
OUT
Device
Under OUT
Test
R
L
C
L
Functional Characteristics Test Circuit
Timing Diagrams
t
r
V
OUT
10%
90%
90%
10%
t
f
Output Rise and Fall Times
V
EN
50%
t
OFF
t
ON
V
OUT
90%
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
MIC2536
Micrel
Supply On Current
vs. Input Voltage
100
SUPPLY ON CURRENT (µA)
ON RESISTANCE (MΩ)
Output On-Resistance
vs. Input Voltage
700
600 85°C
500
400
300
200
100
0
2
4
INPUT VOLTAGE (V)
6
0
2
3
TIME (ms)
Output Rise Time
vs. Input Voltage
4
85°C
25°C
2 –40°C
80
60
–40°C
40
20
25°C
85°C
25°C
–40°C
1
0
2
3
4
5
INPUT VOLTAGE (V)
6
3
4
5
INPUT VOLTAGE (V)
6
Output Fall Time
vs. Input Voltage
120
118
1.5
TIME (ms)
TIME (µs)
Control Voltage vs.
Input Voltage VEN Falling
2.0
–40°C
25°C
85°C
1.0
THRESHOLD VOLTAGE (V)
Control Voltage vs.
Input Voltage VEN Rising
2.5
85°C
2.0
25°C
1.5
1.0 –40°C
0.5
0
2
116
114
112
110
108
2
85°C
3
4
5
INPUT VOLTAGE (V)
6
–40°C
25°C
0.5
0
2
3
4
5
INPUT VOLTAGE (V)
6
3
4
5
INPUT VOLTAGE (V)
6
Flag Delay vs.
Input Voltage
20
85°C
SUPPLY CURRENT (µA)
1
0.8
Supply Off Current
vs. Input Voltage
300
290
CURRENT (mA)
Current Limit Threshold
vs. Input Voltage
85°C
15
TIME (ms)
25°C
10
–40°C
5
280 25°C
270
260
250
–40°C
0.6
–40°C
0.4
0.2
85°C
25°C
0
2
3
4
5
INPUT VOLTAGE (V)
6
0
2
3
4
5
INPUT VOLTAGE (V)
6
240
2
3
4
5
INPUT VOLTAGE (V)
6
Short Circuit Current Limit
vs. Input Voltage
280
270
CURRENT (mA)
260 25°C
250
240
230
220
210
200
2
3
4
5
INPUT VOLTAGE (V)
6
–40°C
85°C
March 2000
5
MIC2536
Embedded System
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