MIC2505/2506
Micrel
MIC2505/2506
Single 2A / Dual 1A / High-Side Switches
General Description
Features
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.
• 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
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.
Applications
Overcurrent limiting is internally fixed and requires no exter-
nal components.
• USB Power Distribution
• 3.3V and 5V power management
• PC Card card inrush limiting switch
• Hot plug-in power supplies
• Battery-charger circuits
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
tailoredtoUniversalSerialBus(USB)applicationsanddonot
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.
Typical Applications
2.7V to 7.5V
2.7V to 7.5V
Pull-up
Pull-up
Resistors
Resistor
MIC2505BM
MIC2506BM
100k
Optional
Open Load
Detect Resistor
(MIC2505BN or
MIC2505BM
only)
100k 100k
(100k each)
(100k)
1
2
3
4
8
1
2
3
4
8
ON
OFF
A ON
A OFF
CTL
OUT
IN
CTL A OUT A
7
7
Optional
FAULT
FLG
FAULT A
FLG A
IN
Open Load
6
6
Detect Resistors
0.1µF
GND
GATE
OUT
IN
FAULT B
FLG B GND
CTL B OUT B
5
5
B ON
B OFF
0.1µF
Optional
Output Delay
Capacitor
Single and Dual Switch/Circuit Breakers with Open-Load Detection and Fault Output
April 1998
1
MIC2505/2506
MICREL [ MICREL SEMICONDUCTOR ]
