MIC94040/1/2/3
28mΩ R
DSON
3A High Side Load Switch
in 1.2mm x 1.2mm MLF
®
package
General Description
The MIC94040/1/2/3 is a family of high-side load switches
designed to operate from 1.7V to 5.5V input voltage. The load
switch pass element is an internal 28mΩ R
DSON
P-channel
MOSFET which enables the device to support up to 3A of
continuous current. Additionally, the load switch supports 1.5V
logic level control and shutdown features in a tiny 1.2mm x
®
1.2mm 4 pin MLF package.
The MIC94040 and MIC94041 feature rapid turn on, while the
MIC94042 and MIC94043 provide a slew rate controlled soft-
start turn-on of 100µs. The soft-start feature is provided to
prevent an in-rush current event from pulling down the input
supply voltage.
The MIC94041 and MIC94043 feature an active load
discharge circuit which switches in a 200Ω load when the
switch is disabled to automatically discharge a capacitive load.
An active pull-down on the enable input keeps the
MIC94040/1/2/3 in a default OFF state until the enable pin is
pulled above 1.2V. Internal level shift circuitry allows low
voltage logic signals to switch higher supply voltages. The
enable voltage can be as high as 5.5V and is not limited by
the input voltage.
The MIC94040/1/2/3 operating voltage range makes them
ideal for Lithium ion and NiMH/NiCad/Alkaline battery
powered systems, as well as non-battery powered
applications. The devices provide low quiescent current and
low shutdown current to maximize battery life.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
∑
28mΩ R
DSON
3A continuous operating current
®
1.2mm x 1.2mm space saving 4-pin MLF package
1.7V to 5.5V input voltage range
Internal level shift for CMOS/TTL control logic
Ultra low quiescent current
Micro-power shutdown current
Soft-Start: MIC94042, MIC94043
Load discharge circuit: MIC94041, MIC94043
Ultra fast turn off time
Junction operating temperature from -40ºC to +125ºC
Applications
Cellular phones
Portable Navigation Devices (PND)
Personal Media Players (PMP)
Ultra Mobile PCs
Portable instrumentation
Other Portable applications
PDAs
Industrial and DataComm equipment
________________________________________________________________________________________________________
Typical Application
MIC94040 (ultra fast turn on)
MIC94042 (soft-start)
MLF and
MicroLeadFrame
is a registered trademark of Amkor Technology, Inc.
MIC94041 (ultra fast turn on with auto-dsicharge)
MIC94043 (soft-start with auto-discharge)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2008
M9999-053008-A
Micrel, Inc.
MIC94040/1/2/3
Ordering Information
Part Number
MIC94040YFL
MIC94041YFL
MIC94042YFL
MIC94043YFL
Notes:
1. MLF Pin 1 Identifier symbol is “”.
2. MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
®
®
Part Marking
—
P4
—
P1
—
P2
—
P3
(1)
Fast
Turn On
Soft-Start
Load
Discharge
Package
(2)
•
•
•
•
•
•
4-Pin (1.2mm x 1.2mm) MLF
4-Pin (1.2mm x 1.2mm) MLF
4-Pin (1.2mm x 1.2mm) MLF
4-Pin (1.2mm x 1.2mm) MLF
®
®
®
®
Pin Configuration
Top View
4-Pin (1.2mm x1.2mm) MLF
®
Pin Description
Pin Number
1
2
3
4
Pin Name
V
OUT
GND
V
IN
EN
Pin Function
Drain of P-channel MOSFET.
Ground should be connected to electrical ground.
Source of P-channel MOSFET.
Enable (Input): Active-high CMOS/TTL control input for switch. Internal ~2MW Pull down resistor.
Output will be off if this pin is left floating.
May 2008
2
M9999-053008-A
Micrel, Inc.
MIC94040/1/2/3
Absolute Maximum Ratings
(1)
Input Voltage (V
IN
) ...........................................................+6V
Enable Voltage (V
EN
) ......................................................+6V
(3)
Continuous Drain Current (I
D
)
T
A
= 25°C ................................................................. ±3A
T
A
= 85°C .................................................................±2A
(4)
Pulsed Drain Current (I
DP
) .........................................±6.0A
(5)
Continuous Diode Current (I
S
) ................................–50mA
Storage Temperature (T
s
) ......................... –55°C to +150°C
(6)
ESD Rating – HBM ....................................................... 3kV
Operating Ratings
(2)
Input Voltage (V
IN
) ..........................................+1.7 to +5.5V
Junction Temperature (T
J
) .......................–40°C to +125°C
Package Thermal Resistance
®
MLF (q
JC
) ........................................................ 90°C/W
Electrical Characteristics
T
A
= 25°C, bold values indicate –40°C< T
A
< +85°C, unless noted.
Symbol
V
EN_TH
I
Q
Parameter
Enable Threshold Voltage
Quiescent Current
Condition
V
IN
= 1.7V to 4.5V, I
D
= –250µA
V
IN
= V
EN
= 5.5V, I
D
= OPEN
Measured on V
IN
MIC94040, MIC94041
V
IN
= V
EN
= 5.5V, I
D
= OPEN
Measured on V
IN
MIC94042, MIC94043
I
EN
I
SHUT-Q
I
SHUT-SWITCH
R
DS(ON)
Enable Input Current
Quiescent Current (shutdown)
OFF State Leakage Current
P-Channel Drain to Source ON
Resistance
V
IN
= V
EN
= 5.5V, I
D
= OPEN
V
IN
= +5.5V, V
EN
= 0V, I
D
= OPEN
Measured on V
IN
V
IN
= +5.5V, V
EN
= 0V, I
D
= SHORT
(7)
Measured on V
OUT
,
V
IN
= +5.0V, I
D
= –100mA, V
EN
= 1.5V
V
IN
= +4.5V, I
D
= –100mA, V
EN
= 1.5V
V
IN
= +3.6V, I
D
= –100mA, V
EN
= 1.5V
V
IN
= +2.5V, I
D
= –100mA, V
EN
= 1.5V
V
IN
= +1.8V, I
D
= –100mA, V
EN
= 1.5V
V
IN
= +1.7V, I
D
= –100mA, V
EN
= 1.5V
R
SHUTDOWN
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. With thermal contact to PCB. See thermal considerations section.
4. Pulse width <300µs with < 2% duty cycle.
5. Continuous body diode current conduction (reverse conduction, i.e. V
OUT
to V
IN
) is not recommended.
6. Devices are ESD sensitive. Handling precautions recommended. HBM (Human body model), 1.5kΩ in series with 100pF.
7. Measured on the MIC94040YFL and MIC94042YFL.
Min
0.4
Typ
Max
1.2
Units
V
µA
0.1
7
2.5
0.1
0.1
28
30
33
45
72
82
250
1
10
4
1
1
55
60
65
90
145
160
400
µA
µA
µA
mΩ
mΩ
mΩ
mΩ
mΩ
mΩ
Ω
Turn-Off Resistance
(MIC94041, MIC94043)
V
IN
= +3.6V, I
TEST
= 1mA, V
EN
= 0V
May 2008
3
M9999-053008-A
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