MIC94030/94031
Micrel
MIC94030/94031
TinyFET™ P-Channel MOSFET
Preliminary Information
General Description
The MIC94030 and MIC94031 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 MIC94030/1 exhibits an on-resistance of typically
0.75Ω at 4.5V gate-to-source voltage. The MIC94030/1 also
operates with only 2.7V gate-to-source voltage.
The MIC94030 is the basic 4-lead P-channel MOSFET. The
MIC94031 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 analog switch applications practical.
The small size, low threshold, and low R
DS(on)
make the
MIC94030/1 the ideal choice for PCMCIA card sleep mode or
distributed power management applications.
Features
• 13.5V minimum drain-to-source breakdown
• 0.75Ω typical on-resistance
at 4.5V gate-to-source voltage
• 0.45Ω typical on-resistance
at 10V gate-to-source voltage
• Operates with 2.7V gate-to-source voltage
• Separate substrate connection for added control
• Industry’s smallest surface mount package
Applications
•
•
•
•
•
Distributed power management
PCMCIA card power management
Battery-powered computers, peripherals
Hand-held bar-code scanners
Portable communications equipment
Ordering Information
Part Number
MIC94030BM4
MIC94031BM4
Temperature Range*
–55°C to +150°C
–55°C to +150°C
Package
SOT-143
SOT-143
* Operating Junction Temperature
Pin Configuration
Typical PCB Layout
D
6
PCB heat sink
plane improves
heat dissipation
SS
Drain
Substrate
Part
Identification
Part Number
Identification
P30
P31
P3x
Gate
Source
MIC94030BM4
MIC94031BM4
SOT-143 Package (M4)
G
S
PCB traces
Schematic Symbol
Functional Diagrams
S
S
Source
Gate
Substrate
Drain
D
G
SS
~500kΩ
G
Internal
gate-to-source
pull-up resistor
SS
D
Schematic Symbol
Patents 5,355,008; 5,589,702
MIC94030
MIC94031
1997
6-41
MICREL [ MICREL SEMICONDUCTOR ]
