MIC94044YFL [MICREL]
28mΩ RDSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF? Package; 在1.2毫米X 1.2毫米MLF 28mΩ导通电阻的3A高压侧负载开关？包
| 型号： | MIC94044YFL |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 28mΩ RDSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF? Package |
| 文件： | 总9页 (文件大小：426K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
• 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
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.
• Micro-power shutdown current
• Soft-Start: 1ms
• Load discharge circuit: MIC94045
• Ultra fast turn off time
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.
• Junction operating temperature from -40ºC to +125ºC
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.
Applications
• Solid State Drives (SSD)
• Cellular phones
• Portable Navigation Devices (PND)
• Personal Media Players (PMP)
• Ultra Mobile PCs
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.
• Portable instrumentation
• Other Portable applications
• PDAs
• Industrial and DataComm equipment
____________________________________________________________________________________________________________
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
M9999-032311-A
March 2011
Micrel, Inc.
MIC94044/5
Ordering Information
Part Number
Marking
P5
Soft-Start
Load Discharge
Package
4-Pin 1.2mm x 1.2mm MLF®
MIC94044YFL
1ms
MIC94045YFL
1ms
―
4-Pin 1.2mm x 1.2mm MLF®
P6
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
VOUT
Description
1
2
3
4
Drain of P-channel MOSFET.
Ground should be connected to electrical ground.
Source of P-channel MOSFET.
GND
VIN
EN
Enable (Input): Active-high CMOS/TTL control input for switch. Do not leave floating.
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March 2011
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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
0.4
Typ
Max
1.2
Units
VEN_TH
Enable Threshold Voltage
VIN = 1.7V to 4.5V, ID = –250µA
V
IQ
Quiescent Current
VIN = VEN = 5.5V, ID = OPEN
Measured on VIN
2.25
10
µA
IEN
Enable Input Current
VIN = VEN = 5.5V, ID = OPEN
0.1
0.1
1
1
µA
µA
ISHUT-Q
Quiescent Current (shutdown)
VIN = +5.5V, VEN = 0V, ID = OPEN
Measured on VIN
ISHUT-SWITCH
RDS(ON)
OFF State Leakage Current
VIN = +5.5V, VEN = 0V, ID = SHORT
0.1
1
µA
(7)
Measured on VOUT
,
P-Channel Drain to Source ON VIN = +5.0V, ID = –100mA, VEN = 1.5V
Resistance
28
30
55
60
mΩ
mΩ
mΩ
mΩ
mΩ
mΩ
Ω
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
33
65
45
90
72
145
160
400
V
IN = +1.7V, ID = –100mA, VEN = 1.5V
IN = +3.6V, ITEST = 1mA, VEN = 0V
82
RSHUTDOWN
Turn-Off Resistance
V
200
MIC94045
Dynamic
tON_DLY
Turn-On Delay Time
Turn-On Rise Time
VIN = +3.6V, ID = –100mA, VEN = 1.5V
VIN = +3.6V, ID = –100mA, VEN = 1.5V
0.2
0.4
0.85
1
1.5
1.5
ms
ms
tON_RISE
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
(No Output Capacitor)
100
20
200
100
ns
ns
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 <300µs 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), 1.5kΩ in series with 100pF.
7. Measured on the MIC94044YFL.
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March 2011
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Micrel, Inc.
MIC94044/5
Typical Characteristics
RDSON Variance
Voltage Drop
vs. Output Current
RDSON vs. VIN
vs. Temperature
150
125
100
75
1.4
3A
450
400
350
300
250
200
150
100
50
2A
1.5A
VIN = 1.7V
1A
1.2
1.0
0.8
500mA
100mA
VIN = 3.6V
VIN = 2.5V
VIN = 4.2V
50
VIN = 5.5V
10000
25
0
100
1000
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
-40 -20
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
TEMPERATURE (˚C)
Rise Time
vs. Input Voltage
Enable Current
vs. Temperature
Quiescent Current
vs. Input Voltage
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
10
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
No Load
9
8
7
6
5
4
3
2
1
0
VEN = 1.5V
V
IN = EN
TA = -40˚C
T = 20°C
T = -45°C
T = 125°C
V
IN = 5.5V
TA = 25˚C
VIN = 3.6V
TA = 125˚C
VIN =1.5V
1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2 5.7
-40 -20
0
20 40 60 80 100 120 140
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
TON Rise Time
TON Delay
Quiescent Current
vs. Temperature
vs. Input Voltage
vs. Input Voltage
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
3.0
2.5
2.0
1.5
1.0
0.5
0.0
3.0
2.5
2.0
1.5
1.0
0.5
0.0
V
IN = 5.5V
VIN = VEN
V
IN = 3.6V
V
IN =1.5V
COUT = 1µF
COUT = 1µF
IOUT = 100mA
IOUT = 100mA
-40 -20
0
20 40 60 80 100 120
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Output Voltage
vs. Input Voltage
TOFF Fall Time
TOFF Delay Time
vs. Input Voltage
vs. Input Voltage
6
5
4
3
2
1
0
200
180
160
140
120
100
80
200
180
160
140
120
100
80
100mA Load
100mA Load
No Output Capacitor
No Output Capacitor
MIC94045
ILOAD = 3A
MIC94045
MIC94044
60
60
MIC94044
40
40
20
20
0
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
M9999-032311-A
March 2011
4
Micrel, Inc.
MIC94044/5
Functional Characteristics
M9999-032311-A
March 2011
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Micrel, Inc.
MIC94044/5
Application Information
Power Switch SOA
The safe operating area (SOA) curve represents the
boundary of maximum safe operating current and
maximum safe operating ambient temperature.
Maximum Switch Current
vs. Ambient Temperature
(1" Square Copper)
3.5
Figure 3: Simple Thermal Circuit
VIN = 5V
3.0
2.5
2.0
VIN = 4.5V
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 (RθCA) and the package (RθJC).
VIN = 3.6V
1.5
VIN = 2.5V
1.0
TJ = PDISS x (RθJC + RθCA) + TA
0.5
0.0
2
PDISS is calculated as ISWITCH x RSWmax. RθJC is found in
-40 -20
0
20 40 60 80 100 120 140
the operating ratings section of the datasheet and RθCA
(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).
AMBIENT TEMPERATURE (°C)
Figure 1: SOA Graph
The curves above show the SOA for various values of
VIN, mounted on a typical 1 layer, 1 square inch copper
board.
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:
Figure 2: Simple Electrical Circuit
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
with temperature (in oC).
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March 2011
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Micrel, Inc.
MIC94044/5
Example:
Summary of variables:
SW = 2A
A switch is intended to drive a 2A load and is placed on
a printed circuit board which has a ground plane area of
at least 25mm x 25mm (625mm2). 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
to 50oC.
I
VIN = 3V to 4.2V
TA = 50oC
RθJC = 90oC/W from Datasheet
RθCA = 53oC/W Read from Graph in Figure 4
P
DISS = ISW2 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 = 90mΩ
If this were a figure for worst case RSWmax for 25oC, an
additional consideration is to allow for the maximum
junction temperature of 125oC, the actual worst case
resistance in this case can be 30% higher (See RDSON
variance vs. temperature graph). However, 90mΩ is the
maximum over temperature.
Figure 4: Excerpt from the LDO Book
Therefore:
TJ = 22 x 0.090 x (90+53) + 50
TJ = 101oC
This is below the maximum 125oC.
M9999-032311-A
March 2011
7
Micrel, Inc.
MIC94044/5
Package Information
4-Pin 1.2mm x 1.2mm MLF®
M9999-032311-A
March 2011
8
Micrel, Inc.
MIC94044/5
Recommended Land Pattern
4-Pin 1.2mm x 1.2mm MLF® Land Pattern
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
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
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.
© 2011 Micrel, Incorporated.
M9999-032311-A
March 2011
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