MIC94080/1/2/3/4/5

MIC94080/1/2/3/4/5
67mΩ RDSON 2A High Side Load Switch
in 0.85mm x 0.85mm Thin MLF® Package
General Description
Features
The MIC94080/1/2/3/4/5 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 67mΩ RDSON P-Channel
MOSFET which enables the device to support up to 2A of
continuous current. Additionally, the load switch supports 1.5V
logic level control and shutdown features in a tiny 0.85mm x
0.85mm 4-pin Thin MLF® package.
The MIC94080 and MIC94081 feature rapid turn on. The
MIC94082 and MIC94083 provide a slew rate controlled softstart turn-on of 800µs, while the MIC94084 and MIC94085
provide a slew rate controlled soft-start turn-on of 120µs. The
soft-start feature is provided to prevent an in-rush current
event from pulling down the input supply voltage.
The MIC94081, MIC94083, and MIC94085 feature an active
load discharge circuit which switches in a 250Ω load when the
switch is disabled to automatically discharge a capacitive load.
An active pull-down on the enable input keeps the
MIC94080/1/2/3/4/5 in a default OFF state until the enable pin
is pulled above 1.25V. 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 MIC94080/1/2/3/4/5 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.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• 0.85mm x 0.85mm space saving 4-pin Thin MLF®
package
• 1.7V to 5.5V input voltage range
• 2A continuous operating current
• 67mΩ RDSON
• Internal level shift for CMOS/TTL control logic
• Ultra low quiescent current
• Micro-power shutdown current
• Soft-Start: MIC94082/3 (800µs), MIC94084/5 (120µs)
• Load discharge circuit: MIC94081, MIC94083,
MIC94085
• 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
GPS Modules
Industrial and DataComm equipment
____________________________________________________________________________________________________________________
Typical Application
VIN
EN
VOUT
Level Shift
and Slew
Rate
Control
VIN
Load
GND
MIC94080 (ultra fast turn on)
MIC94082 (800µs soft-start)
MIC94084 (120µs soft-start)
EN
VOUT
Level Shift
Slew Rate
Control
&
Load
Discharge
Load
GND
MIC94081 (ultra fast turn on with auto-discharge)
MIC94083 (800µs soft-start with auto-discharge)
MIC94085 (120µs soft-start with auto-discharge)
MLF and MicroLeadFrame is a registered trademark 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
January 2011
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Ordering Information
Fast
Turn On
Part Number
Part Marking
Soft-Start
MIC94080YFT
C1
MIC94081YFT
C2
MIC94082YFT
C5
800µs
MIC94083YFT
C7
800µs
MIC94084YFT
C0
120µs
MIC94085YFT
1C
120µs
Load
Discharge
•
•
Package(1)
4-Pin 0.85mm x 0.85mm Thin MLF®
•
4-Pin 0.85mm x 0.85mm Thin MLF®
4-Pin 0.85mm x 0.85mm Thin MLF®
•
4-Pin 0.85mm x 0.85mm Thin MLF®
4-Pin 0.85mm x 0.85mm Thin MLF®
•
4-Pin 0.85mm x 0.85mm Thin MLF®
Notes:
®
1. Thin MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
4-Pin (0.85mm x 0.85mm) Thin MLF®
(Top View)
(Bottom View)
Example Showing Orientation of Part Marking
Pin Description
Pin Number
Pin Name
1
VOUT
Drain of P-Channel MOSFET.
2
GND
Ground should be connected to electrical ground.
3
VIN
Source of P-Channel MOSFET.
EN
Enable (Input): Active-high CMOS/TTL control input for switch. Internal ~2MΩ Pull down resistor.
Output will be off if this pin is left floating.
4
January 2011
Pin Function
2
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Absolute Maximum Ratings(1)
Operating Ratings(2)
Input Voltage (VIN) ........................................................ +6V
Enable Voltage (VEN) ................................................... +6V
Continuous Drain Current (ID) (3)
TA = 25°C .............................................................. ±2A
TA = 85°C ........................................................... ±1.5A
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
0.85mm x 0.85mm Thin MLF®
(θJA) .......................................................140°C/W
(θJC) .........................................................85°C/W
Electrical Characteristics
TA = 25°C, bold values indicate –40°C< TA < +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
Measured on VIN MIC94080/1
VIN = VEN = 5.5V, ID = OPEN
Measured on VIN MIC94082/3/4/5
Typ
Max
Units
1.25
V
0.1
1
µA
8
15
IEN
Enable Input Current
VIN = VEN = 5.5V, ID = OPEN
2.8
4
µA
ISHUT-Q
Quiescent Current (shutdown)
VIN = +5.5V, VEN = 0V, ID = OPEN
(7)
Measured on VIN
0.02
1
µA
ISHUT-SWITCH
OFF State Leakage Current
VIN = +5.5V, VEN = 0V, ID = SHORT
(7)
Measured on VOUT,
0.02
1
µA
RDS(ON)
P-Channel Drain to Source ON
Resistance
VIN = +5.0V, ID = –100mA, VEN = 1.5V
67
115
mΩ
VIN = +4.5V, ID = –100mA, VEN = 1.5V
70
130
mΩ
VIN = +3.6V, ID = –100mA, VEN = 1.5V
80
165
mΩ
VIN = +2.5V, ID = –100mA, VEN = 1.5V
110
225
mΩ
VIN = +1.8V, ID = –100mA, VEN = 1.5V
175
350
mΩ
VIN = +1.7V, ID = –100mA, VEN = 1.5V
200
375
mΩ
VIN = +3.6V, ITEST = 1mA, VEN = 0V
250
400
Ω
RSHUTDOWN
Turn-Off Resistance
MIC94081/3/5
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. 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 MIC94080YFT.
January 2011
3
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Electrical Characteristics (Dynamic)
TA = 25°C, bold values indicate –40°C< TA < +85°C, unless noted.
Symbol
Parameter
Condition
tON_DLY
Turn-On Delay Time
VIN = +3.6V, ID = –100mA, VEN = 1.5V
MIC94080, MIC94081
tON_RISE
Turn-On Rise Time
Min
Typ
Max
Units
0.40
1.5
µs
VIN = +3.6V, ID = –100mA, VEN = 1.5V
MIC94082, MIC94083
200
600
1500
µs
VIN = +3.6V, ID = –100mA, VEN = 1.5V
MIC94084, MIC94085
65
110
165
µs
0.4
1.5
µs
VIN = +3.6V, ID = –100mA, VEN = 1.5V
MIC94080, MIC94081
VIN = +3.6V, ID = –100mA, VEN = 1.5V
MIC94082, MIC94083
400
800
1500
µs
VIN = +3.6V, ID = –100mA, VEN = 1.5V
MIC94084, MIC94085
65
120
175
µs
tOFF_DLY
Turn-Off Delay Time
VIN = +3.6V, ID = –100mA, VEN = 0V
60
200
ns
tOFF_FALL
Turn-Off Fall Time
VIN = +3.6V, ID = –100mA, VEN = 0V
20
100
ns
January 2011
4
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Typical Characteristics
MIC94080/1/2/3/4/5
MIC94080/1
MIC94082/3/4/5
January 2011
MIC94080/1/2/3/4/5
MIC94082/83/84/85
MIC94081/2/3/4/5
5
MIC94080/1/2/3/4/5
MIC94080/81
MIC94080/1
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Typical Characteristics
MIC94082/3
MIC94080/1
MIC94082/3
MIC94084/5
MIC94084/5
MIC94080/1/2/3/4/5
MIC94080/1/2/3/4/5
January 2011
6
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Functional Characteristics
MIC94080
January 2011
7
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
MIC94081
January 2011
8
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
MIC94082
January 2011
9
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
MIC94083
January 2011
10
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
MIC94084
January 2011
11
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
MIC94085
January 2011
12
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Application Information
Power Switch SOA
The safe operating area (SOA) curve represents the
boundary of maximum safe operating current and
maximum safe operating junction temperature.
Figure 3. Simple Thermal Circuit
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).
TJ = PDISS x (RθJC + RθCA) + TA
PDISS is calculated as ISWITCH2 x RSWmax. RθJC is found in
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).
Figure 1. SOA Graph
The curves above show the SOA for various VIN’s
mounted on a typical 1 layer, 1 square inch copper
board.
Example:
A switch is intended to drive a 1A load and is placed on
a printed circuit board which has a ground plane area of
at least 25mm by 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.
Summary of variables:
ISW = 1A
VIN = 3V to 4.2V
TA = 50oC
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:
RθJC = 85ºC/W
RθCA = 53ºC/W Read from Graph in Figure 4
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
with thermal resistance (in ºC/W) and voltage sources
with temperature (in ºC).
January 2011
Figure 4. Excerpt from the LDO Book
13
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
PDISS = 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.
resistance in this case can be 30% higher (See RDSON
variance vs. temperature graph). However, 200mΩ is the
maximum over temperature.
Therefore:
TJ = 12 x 0.2 x (85+53) + 50
TJ = 78ºC
This is below the maximum 125ºC.
RSWmax @ 2.5v = 200mΩ
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
January 2011
14
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Package Information
4-Pin (0.85mm x 0.85mm) Thin MLF® (FT)
January 2011
15
M9999-013111-D
Micrel, Inc.
MIC94080/1/2/3/4/5
Recommended Land Pattern
4-Pin (0.85mm x 0.85mm) Thin MLF® (FT)
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.
© 2008 Micrel, Incorporated.
January 2011
16
M9999-013111-D