MIC94050/94051
Micrel
MIC94050/94051
4-Terminal TinyFET鈩?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
0.125鈩?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
胃
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
鈥?0.125鈩?typical on-resistance
at 4.5V gate-to-source voltage
鈥?Operates with 1.8V gate-to-source voltage
鈥?Separate substrate connection allows reverse-blocking
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
MIC94050BM4
MIC94051BM4
Temperature Range*
鈥?0掳C to +150掳C
鈥?0掳C to +150掳C
Package
SOT-143
SOT-143
* Operating Junction Temperature
Pin Configuration
Typical PCB Layout
D
PCB heat sink
plane improves
heat dissipation
SS
Drain
Part
Identification
Substrate
Part Number
Identification
P50
P51
P5x
Gate
Source
MIC94050BM4
MIC94051BM4
SOT-143 Package (M4)
G
S
PCB traces
Schematic Symbol
Functional Diagrams
S
S
Source
Gate
Substrate
Drain
D
G
SS
~350k鈩?/div>
G
Internal
gate-to-source
pull-up resistor
SS
D
Schematic Symbol
TinyFET is a trademark of Micrel, Inc.
MIC94050
MIC94051
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
July 2002
1
MIC94050/94051
MIC94050相关型号PDF文件下载
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