MIC94044/5
28mΩ RDSON 3A High Side Load Switch
in 1.2mm x 1.2mm MLF® Package
General Description
Features
The MIC94044 and MIC94045 are high-side load switches
designed to operate from 1.7V to 5.5V input voltage. The
load switch pass element is an internal 28mΩ RDSON
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 MIC94044/5 provides a slew rate controlled soft-start
turn-on of 1ms (typical) to prevent an in-rush current event
from pulling down the input supply voltage.
The MIC94045 features an active load discharge circuit
which switches in a 200Ω load when the switch is disabled
to automatically discharge a capacitive load.
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 MIC94044/5 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.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
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28mΩ RDSON
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: 1ms
Load discharge circuit: MIC94045
Ultra fast turn off time
Junction operating temperature from -40ºC to +125ºC
Applications
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Solid State Drives (SSD)
Cellular phones
Portable Navigation Devices (PND)
Personal Media Players (PMP)
Ultra Mobile PCs
Portable instrumentation
Other Portable applications
PDAs
Industrial and DataComm equipment
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Typical Application
MIC94044 (1ms soft-start)
MIC94045 (1ms soft-start with auto-discharge)
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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
March 2011
M9999-032311-A
Micrel, Inc.
MIC94044/5
Ordering Information
Part Number
Marking
Soft-Start
MIC94044YFL
P5
1ms
MIC94045YFL
P6
1ms
Load Discharge
Package
4-Pin 1.2mm x 1.2mm MLF®
―
4-Pin 1.2mm x 1.2mm MLF®
Notes:
®
1. MLF Pin 1 Identifier symbol is “z”.
2. Over bar symbol (¯¯) may not be to scale.
®
3. MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
4-Pin 1.2mm x 1.2mm MLF®
(Top View)
Pin Description
Pin Number
Pin Name
Description
1
VOUT
Drain of P-channel MOSFET.
2
GND
Ground should be connected to electrical ground.
3
VIN
Source of P-channel MOSFET.
4
EN
Enable (Input): Active-high CMOS/TTL control input for switch. Do not leave floating.
March 2011
2
M9999-032311-A
Micrel, Inc.
MIC94044/5
Absolute Maximum Ratings (1)
Operating Ratings (2)
Input Voltage (VIN) ........................................................ +6V
Enable Voltage (VEN) ................................................... +6V
Continuous Drain Current (ID) (3)
TA = 25°C .............................................................. ±3A
TA = 85°C .............................................................. ±2A
Pulsed Drain Current (IDP)(4) ...................................... ±6.0A
Continuous Diode Current (IS)(5) .............................. –50mA
Storage Temperature (Ts) ....................... –55°C to +150°C
ESD Rating – HBM(6)...................................................... 3kV
Input Voltage (VIN)....................................... +1.7 to +5.5V
Junction Temperature (TJ) .....................–40°C to +125°C
Package Thermal Resistance
1.2mm x 1.2mm MLF® -4L(θJC) .........................90°C/W
Electrical Characteristics (7)
TA = 25°C, bold values indicate –40°C< TJ < +85°C, unless noted.
Symbol
Parameter
Condition
Min
VEN_TH
Enable Threshold Voltage
VIN = 1.7V to 4.5V, ID = –250µA
0.4
IQ
Quiescent Current
VIN = VEN = 5.5V, ID = OPEN
IEN
Enable Input Current
ISHUT-Q
Typ
Max
Units
1.2
V
2.25
10
µA
VIN = VEN = 5.5V, ID = OPEN
0.1
1
µA
Quiescent Current (shutdown)
VIN = +5.5V, VEN = 0V, ID = OPEN
Measured on VIN
0.1
1
µA
ISHUT-SWITCH
OFF State Leakage Current
VIN = +5.5V, VEN = 0V, ID = SHORT
(7)
Measured on VOUT,
0.1
1
µA
RDS(ON)
P-Channel Drain to Source ON
Resistance
VIN = +5.0V, ID = –100mA, VEN = 1.5V
28
55
mΩ
VIN = +4.5V, ID = –100mA, VEN = 1.5V
30
60
mΩ
VIN = +3.6V, ID = –100mA, VEN = 1.5V
33
65
mΩ
VIN = +2.5V, ID = –100mA, VEN = 1.5V
45
90
mΩ
mΩ
Measured on VIN
VIN = +1.8V, ID = –100mA, VEN = 1.5V
72
145
VIN = +1.7V, ID = –100mA, VEN = 1.5V
82
160
mΩ
Turn-Off Resistance
VIN = +3.6V, ITEST = 1mA, VEN = 0V
MIC94045
200
400
Ω
tON_DLY
Turn-On Delay Time
VIN = +3.6V, ID = –100mA, VEN = 1.5V
0.2
0.85
1.5
ms
tON_RISE
Turn-On Rise Time
VIN = +3.6V, ID = –100mA, VEN = 1.5V
0.4
1
1.5
ms
tOFF_DLY
Turn-Off Delay Time
VIN = +3.6V, ID = –100mA, VEN = 0V
100
200
ns
tOFF_FALL
Turn-Off Fall Time
VIN = +3.6V, ID = –100mA, VEN = 0V
20
100
ns
RSHUTDOWN
Dynamic
(No Output Capacitor)
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 power dissipation considerations section.
4. Pulse width
