MIC94050/94051
Micrel
MIC94050/94051
4-Terminal SymFET™ P-Channel MOSFET
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.
SymFET™
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
Part Number
Temp. Range*
Package
SOT-143
SOT-143
SOT-143
SOT-143
Pb-FREE
NO
NO
YES
YES
Ordering Information
MIC94050BM4
MIC94051BM4
MIC94050YM4
MIC94051YM4
–40°C to +150°C
–40°C to +150°C
–40°C to +150°C
–40° to +150°C
* Operating Junction Temperature
Pin Configuration
Drain
Part
Identification
Substrate
Typical PCB Layout
D
P5x
Gate
Source
Part Number
MIC94050BM4
MIC94051BM4
MIC94050YM4
MIC94051YM4
Identification
P50
P51
P50
P51
PCB heat sin
k
plane improves
heat dissipation
SS
SOT-143 Package (M4)
G
S
PCB traces
S
Schematic Symbol
Functional Diagrams
S
Gate
Source
Substrate
G
D
SS
~350kΩ
G
Internal
gate-to-source
pull-up resistor
SS
D
Drain
Schematic Symbol
SymFET is a trademark of Micrel, Inc.
MIC94050
MIC94051
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
January 2007
1
MIC94050/94051
MIC94050/94051
Micrel
Absolute Maximum Ratings
Drain-to-Source Voltage
............................................................
–6V
Gate-to-Source Voltage ................................................. –6V
Continuous Drain Current
T
A
= 25°C (V
GS
= 4.5V) ............................................ 1.8A
T
A
= 100°C (V
GS
= 4.5V) .......................................... 1.2A
Total Power Dissipation
T
A
= 25°C ............................................................. 568mW
T
A
= 100°C ........................................................... 227mW
Operating Junction Temperature .............. –40°C to +150°C
Storage Temperature ................................ –55°C to +150°C
ESD Rating,
Note 2
Operating Ratings
Thermal Resistance
θ
JA
...................................................................... 220°C/W
θ
JC
..................................................................... 130°C/W
Electrical Characteristics
(Note 1)
Symbol
V
GS
I
GSS
R
GS
C
ISS
I
DSS
Parameter
Gate Threshold Voltage
Gate-Body Leakage
Gate-Source Resistance
Input Capacitance
Zero Gate Voltage Drain Current
Drain-Source On-Resistance
Condition (Note 1)
V
DS
= 0V, V
GS
= –4.5V,
Note 2, Note 3
V
GS
= 0V, V
DS
= –5.5V
V
DS
= 0V, V
GS
= –4.5V,
Note 2, Note 4
V
DS
= V
GS
, I
D
= –250µA
Min
0.5
200
350
600
1
5
0.125
0.135
0.165
0.225
3
0.160
0.180
0.200
0.320
Typ
Max
1.2
1
500
Units
V
µA
kΩ
pF
µA
µA
Ω
Ω
Ω
Ω
S
V
DS
= –5.5V, V
GS
= 0V
R
DS(ON)
V
DS
= –5.5V, V
GS
= 0V, T
J
= 85°C
V
GS
= –4.5V, I
D
= –100mA
V
GS
= –3.6V, I
D
= –100mA
V
GS
= –2.5V, I
D
= –100mA
V
GS
= –1.8V, I
D
= –100mA
g
FS
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Forward Transconductance
ESD gate½
precautions required
MIC94050 only.
MIC94051 only.
V
DS
= –5.5V, I
D
= –200mA,
Note 5
T
A
= 25°C unless noted. Substrate connected to source for all conditions.
Pulse Test: Pulse Width ≤ 80µs, Duty Cycle ≤ 0.5%.
MIC94050/94051
2
January 2007
MIC94050/94051
Micrel
Package Information
SOT-143 (M4)
MICREL, INC.
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
http://www.micrel.com
2180 FORTUNE DRIVE SAN JOSE, CA 95131
USA
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not½
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.
© 2002 Micrel, Incorporated
January 2007
5
MIC94050/94051
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