MIC2505/2506
Micrel
MIC2505/2506
Single 2A / Dual 1A / High-Side Switches
General Description
The MIC2505, MIC2505-1, MIC2505-2, and MIC2506 are
single and dual integrated high-side power switches that
consist of TTL compatible control/enable inputs, a charge
pump, and protected N-channel MOSFETs. The MIC2505/6
family can be used instead of separate high-side drivers and
MOSFETs in many low-voltage applications.
The MIC2505/6 family controls voltages ranging from 2.7V to
7.5V. The MIC2505-series can deliver at least 2A continuous
current while the MIC2506 can deliver at least 1A continuous
current from each output. A slow turn-on feature prevents
high inrush current when switching capacitive loads. The
internal control circuitry is powered from the same 2.7V to
7.5V. Within the device’s input range, outputs can be forced
higher than the input voltage when disabled.
Multipurpose open-drain fault flag outputs indicate overcur-
rent limiting, open-load detection (except MIC2505-1 and -2
versions), thermal shutdown, or undervoltage lockout for
each channel.
Overcurrent limiting is internally fixed and requires no exter-
nal components.
Open-load detection is active when the switch is off. When
off, a normal load pulls the output pin low. If the load is open,
an optional, external, high-value resistor pulls the output pin
high, triggering the fault flag. MIC2505-1 and -2 versions are
tailored to Universal Serial Bus (USB) applications and do not
include open-load detection.
Thermal shutdown turns off the output if the die temperature
exceeds approximately 135°C. If enabled, the switch auto-
matically restarts when the temperature falls 10°C.
Undervoltage lockout (UVLO) shuts off the output if the
supply drops below 2.3V typical and reenables the output
when the supply exceeds 2.5V typical.
Features
• Low MOSFET on resistance to 2.7V
30mΩ typical at 5V (MIC2505-series)
35mΩ typical at 3.3V (MIC2505-series)
75mΩ typical at 5V (each MIC2506 output)
80mΩ typical at 3.3V (each MIC2506 output)
• 2.7V to 7.5V input
• 110µA typical on-state supply current
• 1µA typical off-state supply current
• Output can be forced higher than input (off-state)
• Current limit
• Thermal shutdown
• 2.5V undervoltage lockout (UVLO)
• Open-load detection
(MIC2505BN/M and MIC2506BN/M only)
• Open-drain fault flag
• 5ms (slow) turn-on and fast turnoff
• Logic-level control/enable input
Applications
•
•
•
•
•
USB Power Distribution
3.3V and 5V power management
PC Card card inrush limiting switch
Hot plug-in power supplies
Battery-charger circuits
Typical Applications
2.7V to 7.5V
Pull-up
Resistor
(100k)
ON
OFF
1
2
3
4
Pull-up
Resistors
(100k each)
A ON
A OFF
2.7V to 7.5V
MIC2505BM
CTL
FLG
GND
GATE
OUT
IN
OUT
IN
8
7
6
5
100k
Optional
Open Load
Detect Resistor
(MIC2505BN or
MIC2505BM
only)
0.1µF
Load
MIC2506BM
1
2
3
4
100k 100k
8
7
6
5
CTL A OUT A
FLG A
FLG B
IN
GND
FAULT
FAULT A
FAULT B
B ON
B OFF
0.1µF
Optional
Open Load
Detect Resistors
CTL B OUT B
Optional
Output Delay
Capacitor
Single and Dual Switch/Circuit Breakers with Open-Load Detection and Fault Output
April 1998
1
MIC2505/2506
Load A
Load B
MIC2505/2506
Micrel
Pin Description
Pin Number
Pin Number
MIC2505 series
MIC2506
1
1/4
Pin Name
CTL (A/B)
Pin Function
Control (Input): TTL compatible control input. High input typically > 1.8V.
Low input typically < 1.6V. MIC2505, MIC2505-1 and MIC2506 are active
high. MIC2505-2 is active low.
Fault Flag (Output): Active-low, open-drain output. If CTL is low, indicates
open load. If CTL is high, indicates current limit, thermal shutdown, or
UVLO.
MIC2505-1 and -2 do not support open-load detect.
Ground: Return.
Output MOSFET Gate: Open for fastest rise time. Connect capacitor to
ground to slow rise time. (See MIC2505 Turn-On Delay graph)
Supply Input: Output MOSFET drain. Also supplies IC’s internal circuitry.
Connect to supply.
MIC2505 series only:
Pins 5 and 7 must be externally connected together.
Switch Output: Output MOSFET source. Typically connect to switched side
of load. Output voltage can be pulled above input voltage in off mode.
MIC2505 series only:
Pins 6 and 8 must be externally connected together.
2
2/3
FLG (A/B)
3
4
5, 7
6
—
7
GND
GATE
IN
6, 8
8/5
OUT (A/B)
Absolute Maximum Ratings
Supply Voltage (V
IN
) .................................................... 8.0V
Fault Flag Voltage (V
FLG
) ............................................. 7.5V
Fault Flag Current (I
FLG
) ............................................ 50mA
Output Voltage (V
OUT
) ................................................. 7.5V
Output Current (I
OUT
) ............................... Internally Limited
Gate Voltage (V
GATE
) ......................................... V
IN
+ 15V
Control Input (V
CTL
) ....................................... –0.3V to 15V
Storage Temperature (T
A
) ....................... –65°C to +150°C
Lead Temperature (Soldering 5 sec.) ....................... 260°C
Operating Ratings
Supply Voltage (V
IN
) ................................... +2.7V to +7.5V
Ambient Operating Temperature (T
A
) ........ –40°C to +85°C
Thermal Resistance
SOIC
(θ
JA
) ......................................................... 160°C/W
DIP
(θ
JA
) ............................................................ 105°C/W
April 1998
3
MIC2505/2506
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