Replacement of
MIC2526
MIK2526
Dual USB Power Control Switch with
Over-current Protection
October 2000 revised September 2002
Description
The MIK2526 is a dual integrated high-side power switch with independent enable and flag functions, optimized for self-powered and
bus-powered Universal Serial Bus (USB) applications. The MIK2526 satisfies the following USB requirements: each switch channel
supplies up to 500 mA; the switch's low on-resistance meets USB voltage drop requirements; fault current is limited to typically 750mA,
and a flag output is available to indicate fault conditions to the local USB controller. Additional features include thermal shutdown to
prevent catastrophic switch failure from high-current loads, undervoltage lockout (UVLO) to ensure that the device remains off unless
there is a valid input voltage present, and 3.3V and 5V logic compatible enable inputs. The MIK2526 is available in active-high and
active-low versions in 8-pin DIP and SOIC packages.
Features
2 independent switches
Individual open-drain fault flag pins
3V to 5.5V input
500mA continuous load current per port
140m maximum on-resistance
5A Maximum Standby Supply Current
Thermal shutdown
Undervoltage lockout (UVLO)
Active-high or active-low enable versions
Applications
USB Power Management
Hot plug-in power supplies
Battery - Charger circuits
Ordering Information
Part Number
Enable
Temperature Range
MIK2526-1 Active
High -40
C to +85C
MIK2526-2 Active
Low -40
C to +85C
Pin configuration MIK2526
-X
8(OUTA)
7(IN)
5(OUTB)
6 (GND)
(ENA) 1
(ENB) 4
(FLGA) 2
(FLGB) 3
LOGIC,
CHARGE
PUMP
LOGIC,
CHARGE
PUMP
Pin description
Pin
Number
Pin
Name
Pin Function
1, 4
EN(A/B)
Enable (Input): Logic-compatible enable input. High input > 2.1V typical. Low input <1.9V typical (-1 active
high, -2 active low).
2, 3
FLG(A/B)
Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, UVLO, and thermal shutdown.
6 GND
Ground.
7
IN
Supply Input: Output MOSFET drain. Also supplies IC's internal circuitry.
8, 5
OUT(A/B)
Switch Output: Output MOSFET source. Typically connect to switched side of load.
Detailed description
Power switch
The power switch is an N-channel MOSFET with a maximum on-state resistance of 140 m
(V
IN
=5V). The power switch supplies a
minimum of 500 mA per switch.
___
Enable (EN or EN)
The logic enable disables the power switch and the bias for the charge pump, driver, and other circuitry to reduce the supply current to
less than 5
A when a logic high is present on EN (MIK2526-2) or a logic low is present on EN (MIK2526-1). The enable input is
compatible with both TTL and CMOS logic levels.
Driver
The driver controls the gate voltage of the power switch. To limit large current surges the driver incorporates circuitry that controls the
rise times and fall times of the output voltage.
Charge pump
An internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above
the source.
Page 1 of 3
Replacement of
MIC2526
MIK2526
Dual USB Power Control Switch with
Over-current Protection
October 2000 revised September 2002
Fault Flag FLG (A/B)
FLG is an N-channel, open-drain MOSFET output. The fault-flag is active (low) for one or more of the following conditions: undervoltage
(while 2V < V
IN
< 2.7), current limit, or thermal shutdown. The flag output MOSFET is capable of sinking a 10 mA load to typically
100mV above ground. Multiple FLG pins may be "wire NO Red" to a common pull-up resistor.
Thermal shutdown
An internal thermal-sense circuit shuts off the power switch when the junction temperature rises to approximately 150
C. Hysteresis is
built into the thermal sense circuit.
Current sense (CS)
A sense FET monitors the current supplied to the load. When an overload or short circuit is encountered, the current-sense circuitry
sends a control signal to the driver. The driver in turn reduces the gate voltage and sends the power FET into its saturation region,
which switches the output into a constant current mode.
Undervoltage lockout
UVLO (undervoltage lockout) prevents the output MOSFET from turning on until V
IN
exceeds approximately 2.5V. In the undervoltage
state, the FLAG will be low. After the switch turns on, if the voltage drops below approximately 2.3V, UVLO shuts off the output
MOSFET and signals fault flag. Undervoltage detection functions only when at least one switch is enabled.
Absolute Maximum Ratings
(Note1)
Parameter Maximum
Units
Supply Voltage (V
IN
) 6
Fault Flag Voltage (V
FLG
) 6
V
Fault Flag Current (I
FLG
) 50
mA
Output Voltage (V
OUT
) 6
V
Output Current (I
OUT
) Internally
Limited
A
Control input (V
EN
)
-0.3 to 12
V
Storage Temperature (T
S
)
-65 to 150
0
C
Operating Ratings
(Note 2)
Parameter MIK2526
Supply Voltage (V
IN
)
3V to 5.5V
Ambient Operating Temperature (T
A
)
-40
0
C to +85
0
C
Electrical Characteristics
T = 25oC, VIN = +5V; unless noted
Parameter Condition
Min
Typ
Max
Units
Note 3, switch off, OUT = open,
0.75
5
Supply Current
Note 3, all switches on, OUT = open,
110
160
Low-to-high transition
2.1
2.4
Enable Input Threshold
High-to-low transition, Note 3
0.8
1.9
V
Enable Input Current
V
EN
= 0V
5.5V
-1
0.01
1
Enable Input Capacitance
1
pF
V
IN
= 5V, I
OUT
=500m , each switch
100
140
Switch Resistance
V
IN
= 3,3V, I
OUT
=500m , each switch
140
180
m
Output Tum-On Delay
R
L
=10
, each output
0.5
ms
Output Tum-On Rise Time
R
L
=10
, each output
1 ms
Output Tumoff Delay
R
L
=10
, each output
1 20 s
Output Tumoff Fall Time
R
L
=10
, each output
1 20 s
Output Leakage Current
each output (output disabled)
10
Continuous Load Current
each output
0.5
Short-Circuit Current Limit
each output (enable into load), V
OUT
=4.0V 0.5 0.75 1.25
Current-Limit Threshold
Ramped load applied to enabled output,
V
OUT
4.0 V
1.6 2.2
T
J
increasing
135
Overtemperature Shutdown
Threshold
T
J
decreasing
125
V
IN
=5,0V, I
L
=10m
10
25
Error Flag Output Resistance
V
IN
=3,3V, I
L
=10m
15
40
Error Flag Off Current
V
FLAG
=5 V
0.01
1
V
IN
increasing
2.5
UVLO Threshold
V
IN
decreasing
2.3
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: Off is
0.8V and on is 2.4V for the MIK2526-1. Off is 2.4V and is 0.8V for the MIK2526-2. The enable input has
approximately 200mV of hysteresis.
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