MIC94050/94051 Micrel
January 2007 1 MIC94050/94051
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 θJA (improved heat dissipation)
and makes reverse-blocking switch applications practical.
The small size, low threshold, and low RDS(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
Ordering Information
Part Number Temp. Range* Package Pb-FREE
MIC94050BM4 –40°C to +150°C SOT-143 NO
MIC94051BM4 –40°C to +150°C SOT-143 NO
MIC94050YM4 –40°C to +150°C SOT-143 YES
MIC94051YM4 –40° to +150°C SOT-143 YES
* 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
S S
PCB heat sin
k
plane improves
heat dissipation
PCB traces
G
S
D
SS
~350kΩ
Internal
gate-to-source
pull-up resistor
G
S
D
S S
Functional Diagrams
Substrate
SourceGate
Drain
P5x
Part
Identification
Part Number Identification
MIC94050BM4 P50
MIC94051BM4 P51
MIC94050YM4 P50
MIC94051YM4 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
SymFET is a trademark of Micrel, Inc.
MIC94050/94051 Micrel
MIC94050/94051 2 January 2007
Electrical Characteristics (Note 1)
Symbol Parameter Condition (Note 1) Min Typ Max Units
VGS Gate Threshold Voltage VDS = VGS, ID = –250µA 0.5 1.2 V
IGSS Gate-Body Leakage VDS = 0V, VGS = –4.5V, Note 2, Note 3 1 µA
RGS Gate-Source Resistance VDS = 0V, VGS = –4.5V, Note 2, Note 4 200 350 500 kΩ
CISS Input Capacitance VGS = 0V, VDS = –5.5V 600 pF
IDSS Zero Gate Voltage Drain Current VDS = –5.5V, VGS = 0V 1 µA
VDS = –5.5V, VGS = 0V, TJ = 85°C 5 µA
RDS(ON) Drain-Source On-Resistance VGS = –4.5V, ID = –100mA 0.125 0.160 Ω
VGS = –3.6V, ID = –100mA 0.135 0.180 Ω
VGS = –2.5V, ID = –100mA 0.165 0.200 Ω
VGS = –1.8V, ID = –100mA 0.225 0.320 Ω
gFS Forward Transconductance VDS = –5.5V, ID = –200mA, Note 5 3 S
Note 1. TA = 25°C unless noted. Substrate connected to source for all conditions.
Note 2. ESD gate�
precautions required
Note 3. MIC94050 only.
Note 4. MIC94051 only.
Note 5. Pulse Test: Pulse Width ≤ 80µs, Duty Cycle ≤ 0.5%.
Absolute Maximum Ratings
Drain-to-Source Voltage ............................................................–6V
Gate-to-Source Voltage ................................................. –6V
Continuous Drain Current
TA = 25°C (VGS = 4.5V) ............................................ 1.8A
TA = 100°C (VGS = 4.5V) .......................................... 1.2A
Total Power Dissipation
TA = 25°C ............................................................. 568mW
TA = 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
θJA ...................................................................... 220°C/W
θJC ..................................................................... 130°C/W
MIC94050/94051 Micrel
January 2007 3 MIC94050/94051
Typical Characteristics
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5
ID (A)
DRAIN-TO-SOURCE VOLTAGE (V)
Drain Characteristics
1.5VGS
2.0VGS
2.5VGS
3.0VGS
3.5VGS
0
100
200
300
400
500
600
700
800
900
1000
0123456
RDS(ON)(mΩ)
GATE-TO-SOURCE VOLTAGE (V)
On-Resistance vs.
Gate-to-Source Voltage
ID = 1A
ID = 100mA
0
100
200
300
400
500
01234
RDS(ON) (mΩ)
DRAIN CURRENT (A)
RDS(ON)
vs. Drain Current
2.5VGS
3.3VGS
1.8VGS
4.2VGS
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
ID = –250µA
0.7
0.8
0.9
1
1.1
1.2
1.3
-40 -15 10 35 60 85 110 135
RDS(ON) (NORMALIZED)
TEMPERATURE (°C)
RDS(ON) Variance
vs. Temperature
VDS=3.6V
ID=0.1A
MIC94050/94051 Micrel
MIC94050/94051 4 January 2007
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
S S
D
G
MIC94050
+2.7V to 3.6V
Li Coin Cell
On
Off
S
S S
D
G
MIC94050
Load
2MΩ
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
January 2007 5 MIC94050/94051
Package Information
SOT-143 (M4)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
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 not�
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