April 1998
1
MIC2505/2506
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.
Typical Applications
Load A
ON
OFF
MIC2505BM
Load
CTL
OUT
FLG
GND
OUT
GATE
IN
Optional
Output Delay
Capacitor
100k
IN
FAULT
2.7V to 7.5V
Pull-up
Resistor
(100k)
1
8
2
7
3
6
4
5
Optional
Open Load
Detect Resistor
(MIC2505BN or
MIC2505BM
only)
0.1F
A ON
A OFF
MIC2506BM
CTL A OUT A
FLG A
FLG B
GND
CTL B OUT B
IN
FAULT A
2.7V to 7.5V
Pull-up
Resistors
(100k each)
1
8
2
7
3
6
4
5
Optional
Open Load
Detect Resistors
0.1F
Load B
100k
100k
B ON
B OFF
FAULT B
Single and Dual Switch/Circuit Breakers with Open-Load Detection and Fault Output
Features
Low MOSFET on resistance to 2.7V
30m
typical at 5V (MIC2505-series)
35m
typical at 3.3V (MIC2505-series)
75m
typical at 5V (each MIC2506 output)
80m
typical at 3.3V (each MIC2506 output)
2.7V to 7.5V input
110
A typical on-state supply current
1
A 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
April 1998
3
MIC2505/2506
MIC2505/2506
Micrel
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
MIC2505 series
MIC2506
1
1 / 4
CTL (A/B)
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.
2
2 / 3
FLG (A/B)
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.
3
6
GND
Ground: Return.
4
--
GATE
Output MOSFET Gate: Open for fastest rise time. Connect capacitor to
ground to slow rise time. (See MIC2505 Turn-On Delay graph)
5, 7
7
IN
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.
6, 8
8 / 5
OUT (A/B)
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.
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
(
JA
) ......................................................... 160
C/W
DIP
(
JA
) ............................................................ 105
C/W
MIC2505/2506
Micrel
MIC2505/2506
4
April 1998
Electrical Characteristics
V
IN
= +5V; GATE = open; T
A
= 25
C, bold indicates 40
C
T
A
+85
C; unless noted
Parameter
Condition
Min
Typ
Max
Units
Supply Current
MIC2505-1
V
CTL
= logic 0, OUT = open
0.75
5
A
MIC2506
V
CTL
= logic 1, OUT = open
110
160
A
MIC2505-2
V
CTL
= logic 0, OUT = open
110
160
A
V
CTL
= logic 1, OUT = open
0.75
5
A
Control Input Voltage
V
CTL
= logic 0
logic 1 transition
2.1
2.4
V
V
CTL
= logic 1
logic 0 transition
0.8
1.9
V
Control Input Current
V
CTL
= logic 0
0.01
1
A
V
CTL
= logic 1
0.01
1
A
Control Input Capacitance
1
pF
Output MOSFET Resistance
MIC2505 series
V
IN
= 5V, T
A
= 25
C
30
50
m
V
IN
= 5V, 40
C < T
A
< +85
C
60
m
V
IN
= 3.3V, T
A
= 25
C
35
60
m
V
IN
= 3.3V, 40
C < T
A
< +85
C
75
m
MIC2506
V
IN
= 5V, T
A
= 25
C
75
125
m
V
IN
= 5V, 40
C < T
A
< +85
C
150
m
V
IN
= 3.3V, T
A
= 25
C
80
135
m
V
IN
= 3.3V, 40
C < T
A
< +85
C
165
m
Output Turn-On Delay
MIC2505 series
R
L
= 10
, C
GATE
= 0
200
850
2000
s
MIC2506
R
L
= 10
each output
100
700
2000
s
Output Turn-On Rise Time
MIC2505 series
R
L
= 10
, C
GATE
= 0
500
3000
7500
s
MIC2506
R
L
= 10
each output
200
2000
6000
s
Output Turnoff Delay
MIC2505 series
R
L
= 10
, C
GATE
= 0
0.7
20
s
MIC2506
R
L
= 10
each output
0.8
20
s
Output Turnoff Fall Time
MIC2505 series
R
L
= 10
, C
GATE
= 0
1.5
20
s
MIC2506
R
L
= 10
each output
0.7
20
s
Output Leakage Current
10
A
Current Limit Threshold
MIC2505 series
2
4
A
MIC2506
1
2
3
A
Open Load Threshold, Note 1
V
CTL
= logic low, Note 2
0.5
1
1.5
V
Overtemperature Shutdown
T
J
increasing
135
C
Threshold
T
J
decreasing
125
C
Error Flag Output Resistance
V
IN
= 5V, I
L
= 10mA
10
25
V
IN
= 3.3V, I
L
= 10mA
15
40
Error Flag Off Current
V
FLAG
= 5V
0.01
1
A
UVLO Threshold
V
IN
= increasing
2.2
2.5
2.7
V
V
IN
= decreasing
2.0
2.3
2.5
V
General Note: Devices are ESD protected, however, handling precautions recommended.
General Note: All limits guaranteed by testing or statistical analysis.
Note 1:
MIC2505-1 and -2 versions have no open load detect feature.
Note 2:
Open-load threshold is the output voltage (V
OUT
) where FLG becomes active (low) when CTL is low. OUT is pulled high by a 100k external
resistor to V
IN
.
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