MIC2514
IttyBitty
®
Integrated High-Side Switch
General Description
The MIC2514 is an integrated high-side power switch that
consists of a TTL compatible input and protected P-
channel MOSFET. The MIC2514 can be used instead of a
separate high-side driver and MOSFET in many low-
voltage applications.
The MIC2514 switches voltage ranging from 3V to 13.5V
and delivers more than 400mA continuous current. A slow
turn-on feature prevents high inrush current when
switching capacitive loads. The internal control circuitry is
powered from the unswitched 3V to 13.5V input.
Current limiting is internally fixed at approximately 1.9A
and requires no external components.
Thermal shutdown turns off the output if the die
temperature exceeds approximately 170°C.
The MIC2514 is available in the 5-pin SOT-23-5 package
with a temperature range of –40°C to +85°C.
Datasheets and support documentation can be found on
Micrel’s web site at:www.micrel.com.
Features
•
MOSFET on-resistance
– 1.5Ω typical at 5V
– 0.95Ω typical at 12V
•
3V to 13.5V input
•
25µA typical on-state supply current at 5V
•
<1µA typical off-state supply current at 5V
•
Current limit
•
Thermal shutdown
•
Slow turn-on
Applications
•
3.3V to 13.5V power management
Ordering Information
Part Number
Standard
MIC2514BM5
Pb-Free
MIC2514YM5
Temp. Range
–40° to +85°C
Package
5-Pin SOT-23
Typical Application
Pin Configuration
1
3
IN GND CTL
3
2
1
4
F10
4
5
Part
Identification
OUT
NC
High-Side Power Switch
5-Pin SOT-23 (M5)
IttyBitty is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2008
1
M9999-082808-C
Micrel, Inc.
MIC2514
Pin Description
Pin Number
1
2
3
4
5
Pin Name
CTL
GND
IN
OUT
NC
Pin Function
Control (Input): Non-inverting TTL compatible control input. High = on, low = off.
Ground
Supply Input: Output MOSFET source. Also supplies IC’s internal circuitry.
Connect to supply.
Switch Output: Output MOSFET drain. Connect to switched side of load.
Not internally connected. Connect to ground plane for lowest package thermal
resistance.
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .....................................................+20V
Output Current (I
OUT
). ................................Internally Limited
Control Input (V
CTL
) ......................................... –0.3V to 15V
Storage Temperature (T
S
).........................–65°C to +150°C
Operating Ratings
(2)
Supply voltage (V
IN
) ...................................... +3V to +13.5V
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Thermal Resistance
(θ
JA
) .................................................................220°C/W
(θ
JC
) .................................................................130°C/W
Control Input (V
CTRL
)...........................................-0.3V to V
IN
Electrical Characteristics
V
IN
= 5V; T
A
= 25°C, except
bold
values indicate –40°C< T
A
< +85°C,
Note 3;
unless noted.
Parameter
Supply Current
Condition
V
CTL
= logic 0, V
IN
= 5V
V
CTL
= logic 0, V
IN
= 13.5V
V
CTL
= logic 1, V
IN
= 3V
V
CTL
= logic 1, V
IN
= 5V
V
CTL
= logic 1, V
IN
= 13.5V
Control Input Voltage
V
CTL
= logic 0, 3V
≤
V
IN
≤
13.5V
V
CTL
= logic 1, 3V
≤
V
IN
≤
5V
V
CTL
= logic 1, 5V
≤
V
IN
≤
13.5V
Output MOSFET
Resistance
V
IN
= 3V
V
IN
= 5V
V
IN
= 12V
Current Limit Threshold
V
IN
= 3V
V
IN
= 5V
V
IN
= 12V
0
0.8
0.8
1.45
1.65
2.4
1.5
0.95
0.5
1.4
1.9
Min
Typ
0.6
2.0
10
25
95
Max
10
25
20
40
200
0.79
2.0
2.3
4.5
2.4
2.7
1.5
1.7
1.5
2.0
2.5
Units
µA
µA
µA
µA
µA
V
V
V
Ω
Ω
Ω
Ω
A
A
A
1.0
1.2
General Note:
Devices are ESD sensitive. Handling precautions recommended
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices production tested at 25°C, but Devices guaranteed over indicated temperature range.
August 2008
2
M9999-082808-C
Micrel, Inc.
MIC2514
Typical Characteristics
On-Resistance
vs. Supply Voltage
V
CTL
= 5V
ON-RESISTANCE ( )
2
T
A
= 25°C
3
1
0
0
5
10
15
SUPPLY VOLTAGE (V)
200
SUPPLY CURRENT (µA)
150
100
50
On-State SupplyCurrent
vs. Temperature
V = 13.5V
IN
V
IN
= 5V
0
-60 -30 0 30 60 90 120 150
TEMPERATURE °C)
(
2.5
2.0
THRESHOLD (V)
1.5
1.0
0.5
Control Input Threshold
vs. Temperature
V
CTL
=
V
S
= 13.5V
TURN-ON DELAY TIME (µs)
V
CTL
=
V
S
= 13.5V
100
Turn-On Delay Time
vs. Load Capacitance
I
L
= 5mA, T = 25°C
A
V
IN
= 5V
10
V
IN
= 13.5V
1
0.1
V
CTL
=
V
IN
= 5V
V
CTL
=
V
IN
= 5V
0
-60 -30 0 30 60 90 120 150
TEMPERATURE °C)
(
1
10
100
1000
LOAD CAPACITANCE (nF)
80
60
Rise Time
vs. Load Current
RISE TIME (µs)
V
IN
= 5V
40
20
T
A
= 25°C
V
IN
= 13.5V
0
0
0.4
0.8
1.2
LOAD CURRENT (A)
1.6
August 2008
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M9999-082808-C
Micrel, Inc.
MIC2514
Typical Characteristics (continued)
10
1
0.1
0.01
0.001
0.1
Fall Time
vs. Load Capacitance
I
L
= 5mA, T = 25°C
A
FALL TIME (ms)
V
IN
= 13.5V
V
IN
= 5V
1
10
100
1000
LOAD CAPACITANCE (nF)
August 2008
4
M9999-082808-C
Micrel, Inc.
MIC2514
Functional Diagram
Functional Description
The MIC2514 is a non-inverting high-side switch. A
logic-high control input turns on the output transistor,
and a logic-low turns off the output transistor. Fault
conditions turn off the output transistor.
Control Input
Applying a logic-high input to CTL (control input)
activates the thermal shutdown and gate control circuits.
If there are no fault conditions, the output MOSFET turns
on.
Gate Control
The gate control circuit applies the supply voltage to the
output MOSFET gate, turning it off, or forces the
MOSFET gate below the supply voltage, turning it on, as
determined by CTL and thermal shutdown.
Input and Output
IN (input) is the supply connection to the logic circuitry
and the source of the output MOSFET. OUT (output) is
the drain of the output MOSFET. In a typical circuit;
current flows through the switch from IN to OUT toward
the load.
The output MOSFET has an intrinsic body diode which
will conduct if OUT is forced to a higher voltage than IN.
Thermal Shutdown
Thermal shutdown turns off the output MOSFET if the
die temperature exceeds approximately 170°C. Thermal
shut-down releases the output after the die temperature
decreases 10°C.
Current Limit
The current limit is preset internally. The preset level
prevents damage to the output MOSFET but allows a
typical current of 1.9A through the output MOSFET for
the MIC2514. This current limit is sufficient to protect the
bond wire and the output device from instantaneous high
current. Package thermal ratings and power dissipation
should be considered when determining safe continuous
operating current. Output current is monitored by
sensing the voltage drop across the output MOSFET
source metal resistance.
August 2008
5
M9999-082808-C
嵌入式系统
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