mic94044 Micrel Semiconductor, mic94044 Datasheet

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mic94044

Manufacturer Part Number
mic94044
Description
28m? Rdson 3a High Side Load Switch In 1.2mm X 1.2mm Mlf Package
Manufacturer
Micrel Semiconductor
Datasheet
General Description
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 R
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
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.
____________________________________________________________________________________________________________
Typical Application
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
March 2011
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
MIC94044 (1ms soft-start)
®
package.
DSON
Features
• 28mΩ R
• 3A continuous operating current
• 1.2mm x 1.2mm space saving 4-pin MLF
• 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
• 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
408
28mΩ R
) 944-0800 • fax + 1 (408) 474-1000 •
MIC94045 (1ms soft-start with auto-discharge)
in 1.2mm x 1.2mm MLF
DSON
DSON
MIC94044/5
3A High Side Load Switch
http://www.micrel.com
®
Package
M9999-032311-A
®
package

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mic94044 Summary of contents

Page 1

... Additionally, the load switch supports 1.5V logic level control and shutdown features in a tiny 1.2mm x 1.2mm 4 pin MLF 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. ...

Page 2

... View) Description 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. Do not leave floating. 2 Load Discharge Package 4-Pin 1.2mm x 1.2mm MLF ― 4-Pin 1.2mm x 1.2mm MLF ® MIC94044/5 ® ® M9999-032311-A ...

Page 3

... With thermal contact to PCB. See power dissipation considerations section. 4. Pulse width <300µs with < 2% duty cycle. 5. Continuous body diode current conduction (reverse conduction, i. Devices are ESD sensitive. Handling precautions recommended. HBM (Human body model), 1.5kΩ in series with 100pF. 7. Measured on the MIC94044YFL. March 2011 (1) Operating Ratings ...

Page 4

... INPUT VOLTAGE (V) T Delay Time OFF vs. Input Voltage 200 180 100mA Load No Output Capacitor 160 140 MIC94045 120 100 80 60 MIC94044 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) 4 MIC94044/5 RDS vs 150 3A 2A 125 1.5A 1A 100 500mA 100mA 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) Quiescent Current vs. Input Voltage 4 ...

Page 5

... Micrel, Inc. Functional Characteristics March 2011 5 MIC94044/5 M9999-032311-A ...

Page 6

... Micrel website (LDO Application Hints know X and R using Figure 3: Simple Thermal Circuit ) and the package (Rθ (Rθ + Rθ DISS calculated DISS SWITCH SWmax MIC94044 from power Rθ is found M9999-032311-A ...

Page 7

... C/W Read from Graph in Figure DISS SW SWmax not available in the datasheet, so the next IN is used 2.5V = 90mΩ SWmax o C, the actual worst case 0.090 x (90+53 101 MIC94044 the lowest SWmax o for SWmax DSON M9999-032311-A ...

Page 8

... Micrel, Inc. Information Package March 2011 ® 4-Pin 1.2mm x 1.2mm MLF 8 MIC94044/5 M9999-032311-A ...

Page 9

... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully March 2011 ® 4-Pin 1.2mm x 1.2mm MLF indemnify Micrel for any damages resulting from such use or sale. © 2011 Micrel, Incorporated. 9 Land Pattern http://www.micrel.com MIC94044/5 M9999-032311-A ...

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