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MIC94040/1/2/3
28m RDSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF(R) 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 28m 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 (R) 1.2mm 4 pin MLF package. The MIC94040 and MIC94041 feature rapid turn on, while the MIC94042 and MIC94043 provide a slew rate controlled softstart turn-on of 100s. 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 200 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
28m RDSON 3A continuous operating current (R) 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 -40C to +125C
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
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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.
(R) (R)
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
(R)
(R)
(R)
(R)
Pin Configuration
Top View 4-Pin (1.2mm x1.2mm) MLF
(R)
Pin Description
Pin Number 1 2 3 4 Pin Name VOUT GND VIN 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.
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Absolute Maximum Ratings(1)
Input Voltage (VIN) ...........................................................+6V Enable Voltage (VEN) ......................................................+6V (3) Continuous Drain Current (ID) TA = 25C ................................................................. 3A TA = 85C .................................................................2A (4) Pulsed Drain Current (IDP) .........................................6.0A (5) Continuous Diode Current (IS) ................................-50mA Storage Temperature (Ts) ......................... -55C to +150C (6) ESD Rating - HBM ....................................................... 3kV
Operating Ratings(2)
Input Voltage (VIN) ..........................................+1.7 to +5.5V Junction Temperature (TJ) .......................-40C to +125C Package Thermal Resistance (R) MLF (qJC) ........................................................ 90C/W
Electrical Characteristics
TA = 25C, bold values indicate -40C< TA < +85C, unless noted.
Symbol VEN_TH IQ Parameter Enable Threshold Voltage Quiescent Current Condition VIN = 1.7V to 4.5V, ID = -250A VIN = VEN = 5.5V, ID = OPEN Measured on VIN MIC94040, MIC94041 VIN = VEN = 5.5V, ID = OPEN Measured on VIN MIC94042, MIC94043 IEN ISHUT-Q ISHUT-SWITCH RDS(ON) Enable Input Current Quiescent Current (shutdown) OFF State Leakage Current P-Channel Drain to Source ON Resistance VIN = VEN = 5.5V, ID = OPEN VIN = +5.5V, VEN = 0V, ID = OPEN Measured on VIN VIN = +5.5V, VEN = 0V, ID = SHORT (7) Measured on VOUT, VIN = +5.0V, ID = -100mA, VEN = 1.5V VIN = +4.5V, ID = -100mA, VEN = 1.5V VIN = +3.6V, ID = -100mA, VEN = 1.5V VIN = +2.5V, ID = -100mA, VEN = 1.5V VIN = +1.8V, ID = -100mA, VEN = 1.5V VIN = +1.7V, ID = -100mA, VEN = 1.5V RSHUTDOWN
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 <300s with < 2% duty cycle. 5. Continuous body diode current conduction (reverse conduction, i.e. VOUT to VIN) is not recommended. 6. Devices are ESD sensitive. Handling precautions recommended. HBM (Human body model), 1.5k in series with 100pF. 7. Measured on the MIC94040YFL and MIC94042YFL.
Min 0.4
Typ
Max 1.2
Units V A
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
A A A m m m m m m
Turn-Off Resistance (MIC94041, MIC94043)
VIN = +3.6V, ITEST = 1mA, VEN = 0V
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Electrical Characteristics (Dynamic)
TA = 25C, bold values indicate -40C< TA < +85C, unless noted.
Symbol tON_DLY Parameter Turn-On Delay Time Condition VIN = +3.6V, ID = -100mA, VEN = 1.5V MIC94040, MIC94041 VIN = +3.6V, ID = -100mA, VEN = 1.5V MIC94042, MIC94043 tON_RISE Turn-On Rise Time VIN = +3.6V, ID = -100mA, VEN = 1.5V MIC94040, MIC94041 VIN = +3.6V, ID = -100mA, VEN = 1.5V MIC94042, MIC94043 tOFF_DLY tOFF_FALL Turn-Off Delay Time Turn-Off Fall Time VIN = +3.6V, ID = -100mA, VEN = 0V VIN = +3.6V, ID = -100mA, VEN = 0V 50 0.5 50 Min Typ 0.97 106 0.9 116 100 20 Max 1.5 185 5 200 200 100 Units s s s s ns ns
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Typical Characteristics
MIC94040/1/2/3 MIC94040/1/2/3 MIC94040/1/2/3
MIC94040/1
MIC94042/3
MIC94040/41
MIC94042/3
MIC94042/3
MIC94040/1
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Typical Characteristics
MIC94042/3 MIC94040/1 MIC94042/3
MIC94040/1
MIC94042/3
MIC94040/1/2/3
MIC94042/3
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Functional Characteristics
MIC94040
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MIC94040/1/2/3
MIC94041
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MIC94040/1/2/3
MIC94042
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MIC94040/1/2/3
MIC94043
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MIC94040/1/2/3
Application Information
Power Dissipation Considerations As with all power switches, the current rating of the switch is limited mostly by the thermal properties of the package and the PCB it is mounted on. There is a simple ohms law type relationship between thermal resistance, power dissipation and temperature, which are analogous to an electrical circuit: Example: A switch is intended to drive a 2A load and is placed on a printed circuit board which has a ground plane area of 2 at least 25mm by 25mm (625mm ). The Voltage source is a Li-ion battery with a lower operating threshold of 3V and the ambient temperature of the assembly can be up o to 50 C. Summary of variables: ISW = 2A VIN = 3V to 4.2V o TA = 50 C RqJC = 90 C/W from Datasheet RqCA = 53 C/W Read from Graph in Figure 3
Figure 1. Simple Electrical Circuit
o o
From this simple circuit we can calculate Vx if we know Isource, Vz and the resistor values, Rxy and Ryz using the equation:
Vx = Isource ( Rxy + Ryz)+ Vz
Thermal circuits can be considered using these same rules and can be drawn similarly by replacing current sources with power dissipation (in Watts), resistance o with thermal resistance (in C/W) and voltage sources o with temperature (in C).
Figure 3. Excerpt from the LDO Book
Figure 2. Simple Thermal Circuit
PDISS = ISW x RSWmax The worst case switch resistance (RSWmax) at the lowest VIN of 3V is not available in the datasheet, so the next lower value of VIN is used. RSWmax @ 2.5v = 90mW If this were a figure for worst case RSWmax for 25 C, an additional consideration is to allow for the maximum o junction temperature of 125 C, the actual worst case resistance in this case can be 30% higher (See RDSON variance vs. temperature graph). However, 90m is the maximum over temperature. Therefore: 2 TJ = 2 x 0.090 x (90+53) + 50 o TJ = 101 C o This is below the maximum 125 C.
o
2
Now replacing the variables in the equation for Vx, we can find the junction temperature (TJ) from power dissipation, ambient temperature and the known thermal resistance of the PCB (RqCA) and the package (RqJC). TJ = PDISS x (RqJC + RqCA) + TA PDISS is calculated as ISWITCH x RSWmax. RqJC is found in the operating ratings section of the datasheet and RqCA (the PCB thermal resistance) values for various PCB copper areas is discussed in the document "Designing with Low Dropout Voltage Regulators" available from the Micrel website (LDO Application Hints).
2
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Package Information
4-Pin (1.2mm x 1.2mm) MLF
(R)
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MIC94040/1/2/3
Suggested Landing Pattern for 4 Pin (1.2mm x 1.2mm) MLF
(R)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A 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 indemnify Micrel for any damages resulting from such use or sale. (c) 2008 Micrel, Incorporated.
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