MIC94050 Datasheet, PDF (1/5 Pages) Micrel Semiconductor – 4-Terminal TinyFET™ P-Channel MOSFET

MIC94050/94051
Micrel
MIC94050/94051
4-Terminal TinyFET™ P-Channel MOSFET
Final
General Description
The MIC94050 and MIC94051 are 4-terminal silicon gate
P-channel MOSFETs that provide low on-resistance in a very
small package.
Designed for high-side switch applications where space is
critical, the MIC94050/1 exhibits an on-resistance of typically
0.125Ω at 4.5V gate-to-source voltage. The MIC94050/1 also
operates with only 1.8V gate-to-source voltage.
The MIC94050 is the basic 4-lead P-channel MOSFET. The
MIC94051 is a variation that includes an internal gate pull-up
resistor that can reduce the system parts count in many
applications.
The 4-terminal SOT-143 package permits a substrate con-
nection separate from the source connection. This 4-terminal
configuration improves the θ_JA (improved heat dissipation)
and makes reverse-blocking switch applications practical.
The small size, low threshold, and low R_DS(on) make the
MIC94050/1 the ideal choice for PCMCIA, USB, back-up
battery-power, and distributed power management applica-
tions.
Features
• 0.125Ω typical on-resistance
at 4.5V gate-to-source voltage
• Operates with 1.8V gate-to-source voltage
• Separate substrate connection allows reverse-blocking
Applications
• Distributed power management
• PCMCIA card power management
• USB ports
• Battery-powered computers, peripherals
• Handheld bar-code scanners
• Portable communications equipment
• Reverse blocking battery management
Ordering Information
Part Number
Temperature Range*
MIC94050BM4
–40°C to +150°C
MIC94051BM4
–40°C to +150°C
* Operating Junction Temperature
Package
SOT-143
SOT-143
Pin Configuration
Typical PCB Layout
Drain Substrate
Part
Identification
P5x
Part Number
MIC94050BM4
MIC94051BM4
Identification
P50
P51
D
PCB heat sink
plane improves
heat dissipation
SS
Gate Source
SOT-143 Package (M4)
G
S
PCB traces
Schematic Symbol
Functional Diagrams
S
S
Gate
Source
Substrate
Drain
Schematic Symbol
~350kΩ
G
SS G
SS
Internal
gate-to-source
D
pull-up resistor
D
MIC94050
MIC94051
TinyFET is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2002
1
MIC94050/94051