Fairchild Semiconductor Electronic Components Datasheet



FPF2146

Full Function Load Switch


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November 2008
FPF2140/42/43/44/46/47
Full Function Load Switch with Reverse Current Blockingtm
Features
„ 1.8 to 5.5V Input Voltage Range
„ Controlled Turn-On
„ 200mA and 400mA Current Limit Options
„ Undervoltage Lockout
„ Thermal Shutdown
„ <2µA Shutdown Current
„ Auto Restart
„ Fast Current limit Response Time
„ 5µs to Moderate Over Currents
„ 30ns to Hard Shorts
„ Fault Blanking
„ Reverse Current Blocking
„ Power Good Function
„ RoHS Compliant
Applications
„ PDAs
„ Cell Phones
„ GPS Devices
„ MP3 Players
„ Digital Cameras
„ Peripheral Ports
„ Hot Swap Supplies
General Description
The FPF2140/42/43/44/46/47 is a series of load switches which
provides full protection to systems and loads which may
encounter large current conditions. These devices contain a
0.12current-limited P-channel MOSFET which can operate
over an input voltage range of 1.8-5.5V. Internally, current is
prevented from flowing when the MOSFET is off and the output
voltage is higher than the input voltage. Switch control is by a
logic input (ON) capable of interfacing directly with low voltage
control signals. Each part contains thermal shutdown protection
which shuts off the switch to prevent damage to the part when a
continuous over-current condition causes excessive heating.
When the switch current reaches the current limit, the part
operates in a constant-current mode to prohibit excessive
currents from causing damage. For the FPF2140/42/44/46, if
the constant current condition still persists after 30ms, the part
will shut off the switch and pull the fault signal pin (FLAGB) low.
The FPF2140/44 have an auto-restart feature which will turn the
switch on again after 450ms if the ON pin is still active. The
FPF2142/46 do not have this auto-restart feature so the switch
will remain off until the ON pin is cycled. For the FPF2143/47, a
current limit condition will immediately pull the fault signal pin
low and the part will remain in the constant-current mode until
the switch current falls below the current limit. The minimum
current limit is 200mA for the FPF2140/42/43 while that for the
FPF2144/46/47 is 400mA.
These parts are available in a space-saving 6 pin 2X2 MLP
package.
BOTTOM
Ordering Information
Part
FPF2140
FPF2142
FPF2143
FPF2144
FPF2146
FPF2147
Current Limit
[mA]
200/300/400
200/300/400
200/300/400
400/600/800
400/600/800
400/600/800
Pin 1
Current Limit
Blanking Time
[ms]
15/30/60
15/30/60
0
15/30/60
15/30/60
0
TOP
Auto-Restart
Time
[ms]
225/450/900
NA
NA
225/450/900
NA
NA
©2008 Fairchild Semiconductor Corporation
FPF2140/42/43/44/46/47 Rev. I
1
ON Pin
Activity
Active HI
Active HI
Active HI
Active HI
Active HI
Active HI
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Typical Application Circuit
OFF ON
VIN VOUT
FPF2140/2/3/4/6/7
PGOOD
FLAGB
ON
GND
TO LOAD
Functional Block Diagram
VIN
UVLO
ON
THERMAL
SHUTDOWN
CONTROL
LOGIC
FLAGB
CURRENT
LIMIT
REVERSE
CURRENT
BLOCKING
VOUT
PGOOD
GND
FPF2140/42/43/44/46/47 Rev. I
2
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Pin Configuration
ON 6
1 PGOOD
GND 5 7 2 VIN
FLAGB 4
3 VOUT
2X2 MicroFET-6
Pin Description
Pin Name
1 PGOOD
2 VIN
3 VOUT
4 FLAGB
5, 7 GND
6 ON
Function
Power Good output: Open drain output which indicate that output voltage has reached
90% of input voltage
Supply Input: Input to the power switch and the supply voltage For the IC
Switch Output: Output of the power switch
Fault Output: Active LO, open drain output which indicates an over current supply under
voltage or over temperature state.
Ground
ON Control Input
Absolute Maximum Ratings
Parameter
VIN, VOUT, ON, FLAGB, PGOOD to GND
Power Dissipation
Operating and Storage Junction Temperature
Thermal Resistance, Junction to Ambient
Electrostatic Discharge Protection
Jedec A114A
Jedec C101C
Jedec A115
IEC 61000-4-2
HBM
CDM
MM
Air Discharge
Contact Discharge
Min
-0.3
-65
4000
2000
400
15000
8000
Max
6
1.2
150
86
Unit
V
W
°C
°C/W
V
V
V
V
V
Recommended Operating Range
Parameter
VIN
Ambient Operating Temperature, TA
Min
Max
Unit
1.8 5.5
V
-40 85 °C
Electrical Characteristics
VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C.
Parameter
Symbol
Conditions
Min
Basic Operation
Operating Voltage
Quiescent Current
VIN
IQ IOUT = 0mA
VIN = 1.8V
VIN = 3.3V
VIN = 5.5V
1.8
40
Typ
70
75
85
Max Units
5.5 V
100
µA
120
FPF2140/42/43/44/46/47 Rev. I
3
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Electrical Characteristics Cont.
.VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C
Parameter
Symbol
Conditions
Min Typ
On-Resistance
ON Input Logic High Voltage
(ON)
ON Input Logic Low Voltage
ON Input Leakage
VIN Shutdown Current
FLAGB Output Logic Low
Voltage
FLAGB Output High Leakage
Current
RON
VIH
VIL
VIN = 3.3V, IOUT = 200mA, TA = 25°C
VIN = 3.3V, IOUT = 200mA, TA = 85°C
VIN = 3.3V, IOUT = 200mA, TA = -40°C to +85°C
VIN = 1.8V
VIN = 5.5V
VIN = 1.8V
VIN = 5.5V
VON = VIN or GND
VON = 0V, VIN = 5.5V,
VOUT = short to GND
VIN = 5V, ISINK = 10mA
VIN = 1.8V, ISINK = 10mA
VIN = VON = 5V
65
0.8
1.4
-1
-2
120
135
0.05
0.12
PGOOD Threshold Voltage
PGOOD Threshold Voltage
Hysteresis
VIN = 5.5V
90
1
PGOOD Output Logic Low
Voltage
PGOOD Output High Leakage
Current
VIN = 5V, ISINK = 10mA
VIN = 1.8V, ISINK = 10mA
VIN = VON = 5V
0.05
0.12
Reverse Block
VOUT Shutdown Current
Protections
VON = 0V, VOUT = 5.5V,
VIN = short to GND
-2
Current Limit
FPF2140, FPF2142,
ILIM
VIN = 3.3V,
VOUT = 3.0V
FPF2143
FPF2144, FPF2146,
FPF2147
200 300
400 600
Thermal Shutdown
Shutdown Threshold TJ increasing
Return from Shutdown
140
130
Hysteresis
10
Under Voltage Lockout
Under Voltage Lockout
Hysteresis
VUVLO VIN Increasing
1.55 1.65
50
Dynamic
Delay On Time
tdON
RL = 500, CL = 0.1µF
Delay Off Time
tdOFF RL = 500, CL = 0.1µF
VOUT Rise Time
tR RL = 500, CL = 0.1µF
VOUT Fall Time
tF RL = 500, CL = 0.1µF
Over Current Blanking Time
tBLANK FPF2140, FPF2142, FPF2144, FPF2146
Auto-Restart Time
tRSTRT FPF2140, FPF2144
Short Circuit Response Time
VIN = VON = 3.3V. Moderate
Over-Current Condition
VIN = VON = 3.3V. Hard Short
Note 1: Package power dissipation on 1 square inch pad, 2 oz. copper board.
25
45
10
110
15 30
225 450
5
30
Max Units
160
180 m
180
V
0.5
V
1
1 µA
2 µA
0.2
V
0.3
1 µA
%
%
0.1 V
0.2 V
1 µA
2 µA
400
mA
800
°C
1.75 V
mV
µs
µs
µs
µs
60 ms
900 ms
µs
ns
FPF2140/42/43/44/46/47 Rev. I
4
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Typical Characteristics
90
85
80
75
70
65
60
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
110
105
100
95
90
85
80
75
70
65
60
55
50
-40
VIN = 5.5V
VIN = 3.3V
VIN = 1.8V
-15 10 35 60
TJ, JUNCTION TEMPERATURE (°C)
85
Figure 2. Quiescent Current vs. Temperature
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
Figure 3. VON High Voltage vs. Input Voltage
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
Figure 4. VON Low Voltage vs. Input Voltage
200
190
180
170
160
150
140
130
120
110
100
90
80
1
234
VIN, SUPPLY VOLTAGE (V)
Figure 5. RON vs. VIN
5
240
220
200
180
160
140
120
100
80
60
6 -40
VIN= 1.8V
VIN= 3.3V
VIN= 5.5V
-15 10 35 60
TJ, JUNCTION TEMPERATURE (°C)
Figure 6. RON vs. Temperature
85
FPF2140/42/43/44/46/47 Rev. I
5
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Typical Characteristics
350
FPF2140 / 42 / 43
300 VIN = 5.5V
250
200
150
100
50
0
0123456
VIN - VOUT (V)
Figure 7. Current Limit vs. Output Voltage
700
FPF2144 / 46 / 47
600 VIN = 5.5V
500
400
300
200
100
0
0123456
VIN - VOUT (V)
Figure 8. Current Limit vs. Output Voltage
320
FPF2140 / 42 / 43
315
310
305
300
295
290
-65 -40 -15 10 35 60 85 110 135
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Current Limit vs. Temperature
635
630
625
620
615
610
605
600
595
590
585
580
575
-65
FPF2144 / 46 / 47
-40 -15 10 35 60 85 110 135
TJ, JUNCTION TEMPERATURE (°C)
Figure 10. Current Limit vs. Temperature
100
VIN = 3.3 V
RL = 500 Ohms
COUT = 0.1uF
tdOFF
tdON
1000
VIN = 3.3 V
RL = 500 Ohms
100
10
TF
TR
10
-40
-15 10 35 60
TJ, JUNCTION TEMPERATURE (°C)
Figure 11. tdON / tdOFF vs. Temperature
85
1
-40
-15 10 35 60
TJ, JUNCTION TEMPERATURE (°C)
Figure 12. TRISE / TFALL vs. Temperature
85
FPF2140/42/43/44/46/47 Rev. I
6
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Typical Characteristics
33
32.5
32
31.5
31
30.5
30
29.5
-40
-15 10 35 60
TJ, JUNCTION TEMPERATURE (°C)
Figure 13. TBLANK vs. Temperature
85
500
495
490
485
480
475
470
465
460
455
450
-40
-15 10 35 60
TJ, JUNCTION TEMPERATURE (°C)
Figure 14. TRESTART vs. Temperature
85
VON
2V/DIV
IOUT
10mA/DIV
VOUT
2V/DIV
CIN = 10µF
COUT = 0.1µF
RL = 500
VIN = 3.3V
100µs/DIV
Figure 15. tdON Response
VON
2V/DIV
IOUT
10mA/DIV
CIN = 10µF
COUT = 0.1µF
RL = 500
VIN = 3.3V
500ns/DIV
Figure 16. tdOFF Response
VIN
2V/DIV
IOUT
5A/DIV
VOUT
2V/DIV
CIN = 10µF
VIN = 3.3V
20µs/DIV
Figure 17. Short Circuit Response Time
(Output shorted to GND)
VIN = VON
2V/DIV
IOUT
500mA/DIV
CIN = 10µF
VIN = VON = 3.3V
VOUT = GND
50µs/DIV
Figure 18. Current Limit Response Time
(Switch is powered into a short)
FPF2140/42/43/44/46/47 Rev. I
7
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Typical Characteristics
VIN
2V/DIV
VON
2V/DIV
IOUT
500mA/DIV
VOUT
2V/DIV
CIN = 10µF
COUT = 0.1µF
VIN = 3.3V
50µs/DIV
Figure 19. Current Limit Response Time
(Output is loaded by 2.2, COUT = 0.1µF)
VIN
5V/DIV
VON
5V/DIV
CIN = 10µF
COUT = 0.1µF
RL = 500
VIN = 5.5V
VOUT
5V/DIV
PGOOD
5V/DIV
10µs/DIV
Figure 21. PGOOD Response
VIN
2V/DIV
VON
2V/DIV
IOUT
500mA/DIV
VOUT
2V/DIV
CIN = 10µF
COUT = 10µF
VIN = 3.3V
50µs/DIV
Figure 20. Current Limit Response Time
(Output is loaded by 2.2, COUT = 10µF)
VDRV2
2V/DIV
FPF2140/42/44/46
VON
2V/DIV
IOUT
500mA/DIV
VOUT
2V/DIV
TBLANK
CIN = 10µF
COUT = 0.1µF
RL = 500
VIN = 3.3V
20ms/DIV
Figure 22. TBLANK Response
VDRV2
2V/DIV
VON
2V/DIV
IOUT
500mA/DIV
VOUT
2V/DIV
FPF2140/44
TRESTART
CIN = 10µF
COUT = 0.1µF
RL = 500
VIN = 3.3V
100ms/DIV
Figure 23. TRESTART Response
Note 2: VDRV signal forces the device to go into overcurrent condition by loading.
FPF2140/42/43/44/46/47 Rev. I
8
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Description of Operation
The FPF2140/42/43/44/46/47 are current limited switches that
protect systems and loads which can be damaged or disrupted
by the application of high currents. The core of each device is a
0.12P-channel MOSFET and a controller capable of
functioning over a wide input operating range of 1.8-5.5V. The
controller protects against system malfunctions through current
limiting, undervoltage lockout and thermal shutdown. The
current limit is preset for either 200mA or 400mA.
On/Off Control
The ON pin controls the state of the switch. Activating ON
continuously holds the switch in the on state so long as there is
no undervoltage on VIN or a junction temperature in excess of
140°C. ON is active HI and has a low threshold making it
capable of interfacing with low voltage signals. In addition,
excessive currents will cause the switch to turn off for FPF2140/
42 and FPF2144/46. The FPF2140/44 have an Auto-Restart
feature which will automatically turn the switch on again after
450ms. For the FPF2142/46, the ON pin must be toggled to
turn-on the switch again. With no auto-restart, the FPF2143/47
do not turn off in response to a over current condition but
instead remain operating in a constant current mode so long as
ON is active and the thermal shutdown or undervoltage lockout
have not activated.
The ON pin control voltage and VIN pin have independent
recommended operating ranges. The ON pin voltage can be
driven by a voltage level higher than the input voltage.
Fault Reporting
Upon the detection of an over-current, an input undervoltage, or
an over-temperature condition, the FLAGB signals the fault
mode by activating LO. For the FPF2140/42/44/46, the FLAGB
goes LO at the end of the blanking time while FLAGB goes LO
immediately for the FPF2143/47. FLAGB remains LO through
the Auto-Restart Time for the FPF2140/44. For the FPF2142/
46, FLAGB is latched LO and ON must be toggled to release it.
With the FPF2143/47, FLAGB is LO during the faults and
immediately returns HI at the end of the fault condition. FLAGB
is an open-drain MOSFET which requires a pull-up resistor
between VIN and FLAGB. During shutdown, the pull-down on
FLAGB is disabled to reduce current draw from the supply.
Current Limiting
The current limit guarantees that the current through the switch
doesn't exceed a maximum value while not limiting at less than
a minimum value. For the FPF2140/42/43 the minimum current
is 200mA and the maximum current is 400mA and for the
FPF2144/46/47 the minimum current is 400mA and the
maximum current is 800mA. The FPF2140/42/44/46 have a
blanking time of 30ms, nominally, during which the switch will
act as a constant current source. At the end of the blanking
time, the switch will be turned-off and the FLAGB pin will
activate to indicate that current limiting has occurred. The
FPF2143/47 have no current limit blanking period so
immediately upon a current limit condition FLAGB is activated.
These parts will remain in a constant current state until the ON
pin is deactivated or the thermal shutdown turns-off the switch.
For preventing the switch from large power dissipation during
heavy load a short circuit detection feature is introduced. Short
circuit condition is detected by observing the output voltage.
The switch is put into short circuit current limiting mode if the
switch is loaded with a heavy load. When the output voltage
drops below VSCTH, short circuit detection threshold voltage,
the current limit value re-conditioned and short circuit current
limit value is decreased to 62.5% of the current limit value. This
keeps the power dissipation of the part below a certain limit
even at dead short conditions at 5.5V input voltage. The VSCTH
value is set to be 1V. At around 1.1V of output voltage the
switch is removed from short circuit current limiting mode and
the current limit is set to the current limit value.
Undervoltage Lockout
The undervoltage lockout turns-off the switch if the input
voltage drops below the undervoltage lockout threshold. With
the ON pin active the input voltage rising above the
undervoltage lockout threshold will cause a controlled turn-on of
the switch which limits current over-shoots.
Reverse Current Blocking
The entire FPF2140/47 family has a Reverse Current Blocking
feature that protects input source against current flow from
output to input. For a standard USB power design, this is an
important feature which protects the USB host from being
damaged due to reverse current flow on VBUS. The reverse
current blocking feature is active when the load switch is turned
off.
If ON pin is LO and output voltage become greater than input
voltage, no current can flow from the output to the input . The
FLAGB operation is independent of the Reverse Current
blocking feature and will not report a fault condition if this
feature is activated.
Thermal Shutdown
The thermal shutdown protects the die from internally or
externally generated excessive temperatures. During an
over-temperature condition the FLAGB is activated and the
switch is turned-off. The switch automatically turns-on again if
temperature of the die drops below the threshold temperature.
Timing Diagram
VON
10%
90%
VOUT
90%
10%
where:
tdON =
tR =
tON =
tdOFF =
tF =
tOFF =
tdON tR
tON
Delay On Time
VOUT Rise Time
Turn On Time
Delay Off Time
VOUT Fall Time
Turn Off Time
90%
10%
tdOFF tF
tOFF
FPF2140/42/43/44/46/47 Rev. I
9
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Application Information
Typical Application
Battery
1.8V-5.5V
Typical value = 100K
OFF ON
C1 = 4.7µF
VIN VOUT
FPF2140/2/3/4/6/7
PGOOD
ON
GND
FLAGB
LOAD
R1 = 100K
C2 = 0.1µF
R2 = 499
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch turns-on into a discharged load
capacitor or a short-circuit, a capacitor needs to be placed
between VIN and GND. A 4.7µF ceramic capacitor, CIN, must be
placed close to the VIN pin. A higher value of CIN can be used to
further reduce the voltage drop experienced as the switch is
turned on into a large capacitive load.
Output Capacitor
A 0.1uF capacitor COUT, should be placed between VOUT and
GND. This capacitor will prevent parasitic board inductances
from forcing VOUT below GND when the switch turns-off. For the
FPF2140/42/44/46, the total output capacitance needs to be
kept below a maximum value, COUT(max), to prevent the part
from registering an over-current condition and turning-off the
switch. The maximum output capacitance can be determined
from the following formula,
COUT(max) =
ILIM(max) x tBLANK(min)
VIN
(1)
Power Dissipation
During normal operation as a switch, the power dissipation is
small and has little effect on the operating temperature of the
part. The parts with the higher current limits will dissipate the
most power and that will only be,
P = (ILIM)2 x RDS = (0.8)2 x 0.12 = 76.8mW
(2)
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2140/44, the power dissipation will scale by the
Auto-Restart Time, tRSTRT, and the Over Current Blanking Time,
tBLANK, so that the maximum power dissipated is,
P(max) =
tBLANK
tBLANK + tRSTRT
x VIN(max) x ILIM(max)
=
30
30 + 450
x 5.5 x 0.8 = 275mW
(3)
When using the FPF2142/46 attention must be given to the
manual resetting of the part. The junction temperature will only
be allowed to increase to the thermal shutdown threshold. Once
this temperature has been reached, toggling ON will not turn-on
the switch until the junction temperature drops. For the
FPF2140/44, a short on the output will cause the part to operate
in a constant current state dissipating a worst case power as
calculated in (3) until the thermal shutdown activates. It will then
cycle in and out of thermal shutdown so long as the ON pin is
active and the short is present.
Board Layout
For best performance, all traces should be as short as possible.
To be most effective, the input and output capacitors should be
placed close to the device to minimize the effects that parasitic
trace inductances may have on normal and short-circuit
operation. Using wide traces for VIN, VOUT and GND will help
minimize parasitic electrical effects along with minimizing the
case to ambient thermal impedance.
The middle pad (pin 7) should be connected to the GND plate
of PCB for improving thermal performance of the load switch.
An improper layout could result higher junction temperature and
triggering the thermal shutdown protection feature. This concern
applies specially with FPF2143 and FPF2147 where load switch
turns on into an overcurrent condition and switch supplies
constant current limit value. In this case power dissipation of the
switch (PD = (VIN - VOUT) x ILIM(max)) could exceed the
maximum absolute power dissipation of 1.2W.
FPF2140/42/43/44/46/47 Rev. I
10
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Application Notes
Startup Power Sequence
VIN1 FPF2140/2/ VOUT1
3/4/6/7
VIN1
PGOOD
FLAGB
OFF ON ON GND
100K
To Load
VIN2 FPF2140/2/ VOUT2
3/4/6/7
VIN2
PGOOD
FLAGB
ON GND
100K
TP
To Load
Power good function in sequential startup. No battery is loaded to the output
Power Good
FPF214X family has a "Power Good" feature. PGOOD pin is an
open-drain MOSFET which asserts high when the output
voltage reaches 90% of the input voltage.
PGOOD pin requires an external pull up resistor that is
connected to the output voltage when there is no battery in the
load side and the logic level of the subsequent controller
permits. This would give logic levels similar to a CMOS output
stage for PGOOD, while still keeping the option to tie the pull-up
to a different supply voltage. A typical value of 100Kis
recommended to be used as pull up resistor. The PGOOD pin
status is independent of the ON pin position. This mean that
PGOOD pin stays low when the load switch is OFF. If the Power
Good feature is not used in the application the pin can be
connected directly to GND.
Sequential Startup using Power Good
The power good pin can be connected to another load switch's
enable pin to implement sequential startup. PGOOD pin asserts
low when the load switch is OFF. This feature allows driving a
subsequent circuit. The above diagram illustrates power good
function in sequential startup. As the VOUT1 of the first load
switch starts to ramp to the 90% of its input voltage the second
switch remains in OFF state. Whereas the VOUT1 passes the
90% threshold, power good signal becomes active and asserts
high. This signal will turn on the second load switch and VOUT2
will start to increase. The total startup time may vary according
to the difference between supply voltages that are used in the
application.
FPF2140/42/43/44/46/47 Rev. I
11
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0.05 C
2X
2.0
A
B
2.0
PIN#1 IDENT
TOP VIEW
0.05 C
2X
0.10 C
0.08 C
SEATING
PLANE
SIDE VIEW
C
PIN #1 IDENT
(6X)
1
(0.70)
(0.20)4X
3
(0.40)
(0.60)
6
0.65
1.30
4
0.10
0.05
BOTTOM VIEW
(6X)
CAB
C
1.72
1.68
64
0.15
0.90
0.52(6X)
1
0.65
1.21
2.25
3
0.42(6X)
RECOMMENDED
LAND PATTERN
NOTES:
A. PACKAGE DOES NOT FULLY CONFORM
TO JEDEC MO-229 REGISTRATION
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS AND TOLERANCES PER
ASME Y14.5M, 2009.
D. LAND PATTERN RECOMMENDATION IS
EXISTING INDUSTRY LAND PATTERN.
E. DRAWING FILENAME: MKT-MLP06Krev5.


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