MIC94050/94051
Micrel
July 2002
1
MIC94050/94051
MIC94050/94051
4-Terminal TinyFETTM 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
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
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
0.125
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*
Package
MIC94050BM4
40
C to +150
C
SOT-143
MIC94051BM4
40
C to +150
C
SOT-143
* Operating Junction Temperature
Gate
Source
Drain
Substrate
Schematic Symbol
MIC94050
MIC94051
Schematic Symbol
Pin Configuration
SOT-143 Package (M4)
Typical PCB Layout
S
D
G
SS
PCB heat sink
plane improves
heat dissipation
PCB traces
G
S
D
SS
~350k
Internal
gate-to-source
pull-up resistor
G
S
D
SS
Functional Diagrams
Substrate
Source
Gate
Drain
P5x
Part
Identification
Part Number
Identification
MIC94050BM4
P50
MIC94051BM4
P51
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
TinyFET is a trademark of Micrel, Inc.
MIC94050/94051
Micrel
MIC94050/94051
2
July 2002
Electrical Characteristics
(Note 1)
Symbol
Parameter
Condition (Note 1)
Min
Typ
Max
Units
V
GS
Gate Threshold Voltage
V
DS
= V
GS
, I
D
= 250
A
0.5
1.2
V
I
GSS
Gate-Body Leakage
V
DS
= 0V, V
GS
= 4.5V, Note 2, Note 3
1
A
R
GS
Gate-Source Resistance
V
DS
= 0V, V
GS
= 4.5V, Note 2, Note 4
200
350
500
k
C
ISS
Input Capacitance
V
GS
= 0V, V
DS
= 5.5V
600
pF
I
DSS
Zero Gate Voltage Drain Current
V
DS
= 5.5V, V
GS
= 0V
1
A
V
DS
= 5.5V, V
GS
= 0V, T
J
= 85
C
5
A
R
DS(ON)
Drain-Source On-Resistance
V
GS
= 4.5V, I
D
= 100mA
0.125
0.160
V
GS
= 3.6V, I
D
= 100mA
0.135
0.180
V
GS
= 2.5V, I
D
= 100mA
0.165
0.200
V
GS
= 1.8V, I
D
= 100mA
0.225
0.280
g
FS
Forward Transconductance
V
DS
= 5.5V, I
D
= 200mA, Note 5
3
S
Note 1.
T
A
= 25
C unless noted. Substrate connected to source for all conditions.
Note 2.
ESD gate protection diode conducts during positive gate-to-source voltage excursions. IC devices are inherently ESD sensitive. Handling
precautions required
Note 3.
MIC94050 only.
Note 4.
MIC94051 only.
Note 5.
Pulse Test: Pulse Width
80
s, Duty Cycle
0.5%.
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
JA ......................................................................................
220
C/W
JC .....................................................................................
130
C/W
MIC94050/94051
Micrel
July 2002
3
MIC94050/94051
Typical Characteristics
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
I
D
(A)
DRAIN-TO-SOURCE VOLTAGE (V)
Drain Characteristics
1.5V
GS
2.0V
GS
2.5V
GS
3.0V
GS
3.5V
GS
0
100
200
300
400
500
600
700
800
900
1000
0
1
2
3
4
5
6
R
DS(ON)
(m
)
GATE-TO-SOURCE VOLTAGE (V)
On-Resistance vs.
Gate-to-Source Voltage
I
D
= 1A
I
D
= 100mA
0
100
200
300
400
500
0
1
2
3
4
R
DS(ON)
(m
)
DRAIN CURRENT (A)
R
DS(ON)
vs. Drain Current
2.5V
GS
3.3V
GS
1.8V
GS
4.2V
GS
0
0.5
1
1.5
2
2.5
0
1
2
3
4
DRAIN-SOURCE DIODE V
F
(V)
DRAIN-SOURCE CURRENT (A)
Source Drain Diode
Forward Voltage Drop
vs. Current
100
s Pulse
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
-60
-40
-20
0
20
40
60
80
100
120
140
160
GATE THRESHOLD (V)
TEMPERATURE (
C)
Gate Threshold
vs. Temperature
I
D
= 250
A
0.7
0.8
0.9
1
1.1
1.2
1.3
-40 -15 10 35 60 85 110 135
R
DS(ON)
(NORMALIZED)
TEMPERATURE (
C)
R
DS(ON)
Variance
vs. Temperature
V
DS
=3.6V
I
D
=0.1A
MIC94050/94051
Micrel
MIC94050/94051
4
July 2002
Typical Applications
Load
+5V
74HC04
On
Off
* Substrate must be
connected to source
S
SS*
D
G
MIC94050
Figure 1. Load Switch Application
Load
+5V
Open Drain
Output
* Substrate must be
connected to source
S
SS*
D
G
MIC94051
Internal
Resistor
Figure 2. Load Switch Application
(with internal gate-source pull-up)
+4V
On
Off
S
SS
D
G
MIC94050
+2.7V to 3.6V
Li Coin Cell
On
Off
S
SS
D
G
MIC94050
Load
2M
A
B
Output
Off Off 0V
On Off +4V
Off On Li Coin Cell
On On don't!
A
B
Figure 3. Reverse-Blocking Battery Back-Up Application
MIC94050/94051
Micrel
July 2002
5
MIC94050/94051
Package Information
0.150 (0.0059)
0.089 (0.0035)
8
0
0.400 (0.016) TYP 3 PLACES
2.50 (0.098)
2.10 (0.083)
1.40 (0.055)
1.20 (0.047)
0.950 (0.0374) TYP
3.05 (0.120)
2.67 (0.105)
0.800 (0.031) TYP
1.12 (0.044)
0.81 (0.032)
0.10 (0.004)
0.013 (0.0005)
DIMENSIONS:
MM (INCH)
0.41 (0.016)
0.13 (0.005)
CL
CL
SOT-143 (M4)
MICREL, INC.
1849 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel, Inc.
2002 Micrel, Incorporated
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