AP2281 - Diodes Incorporated

 AP2281
Green
SINGLE SLEW RATE CONTROLLED LOAD SWITCH
Description
Pin Assignments
The AP2281 slew rate controlled load switch is a single P-channel
MOSFET power switch designed for high-side load-switching
applications. The MOSFET has a typical RDS(ON) of 80m at 5V,
( Top View )
allowing increased load current handling capacity with a low forward
voltage drop. The turn-on slew rate of the device is controlled
internally.
The AP2281 load switch is designed to operate from 1.5V to 6V,
making it ideal for 1.8V, 2.5V, 3.3V, and 5V systems. The typical
quiescent supply current is only 0.01µA.
IN
1
IN
2
EN
3
7


Wide input voltage range: 1.5V – 6V
Low RDS(ON): 80mΩ typical @ 5V

Turn-on slew rate controlled

AP2281-1: 1ms turn-on rise time

AP2281-3: 100µs turn-on rise time with internal discharge

Very low turn-on quiescent current: << 1µA

Fast load discharge option



Temperature range -40°C to +85°C
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3) Smart Phones
PDA

Cell Phones

GPS Navigators

PMP/MP4

Notebook and Pocket PC
Notes:
5
OUT
4
GND
(Top View)
OUT 1
6 IN
5 GND
GND 2
EN 3
4 IN
SOT26
Applications

OUT
U-DFN2018-6
Features

6
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
VIN
VOUT
IN
1uF
OUT
0.1uF
Enable
EN
GND
AP2281
Document number: DS31359 Rev. 7 - 2
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AP2281
Pin Descriptions
Pin Name
SOT26
Pin Number
U-DFN2018-6
OUT
1
5, 6
GND
EN
2, 5
3
4
3
IN
4, 6
1, 2
PAD
7
Function
Voltage output pin. This is the pin to the P-channel MOSFET drain connection. Bypass to ground
through a 0.1uF capacitor.
Ground.
Enable input, active high
Voltage input pin. This is the pin to the P-channel MOSFET source. Bypass to ground through a
1µF capacitor.
Thermal pad. Suggest connecting to ground plane to get better heat dissipation.
Options
Part Number
AP2281-1
AP2281-3
Slew Rate (typ)
1ms
100µs
Active Pull Down
No
Yes
Enable
Active High
Active High
Functional Block Diagram
AP2281
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AP2281
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
ESD HBM
Parameter
Human Body Model ESD Protection
ESD MM
Machine Model ESD Protection
Ratings
5
Unit
KV
500
450
V
V
SOT26
U-DFN2018-6
6.5
V
VOUT
Output Voltage
VIN +0.3
V
VEN
Enable Voltage
6.5
V
Iload
Maximum Continuous Load Current
2
A
°C
VIN
Input Voltage
TJ
Operating Junction Temperature Range
-40 to +125
TST
Storage Temperature Range
-65 to +150
°C
720
1410
mW
mW
PD
Notes:
SOT26 (Note 4, 5, 6)
U-DFN2018-6 (Note 4, 5, 7)
Power Dissipation
4. TJ, max = +125°C.
5. Ratings apply to ambient temperature at +25°C.
Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; functional
operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to
absolute maximum rating conditions for extended periods of time.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
VIN
Input voltage
IOUT
Output Current
TA
Operating Ambient Temperature
Min
Max
Unit
1.5
6.0
V
0
2.0
A
-40
+85
°C
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Min
Typ
Max
Unit
IQ
Input Quiescent Current
VEN = VIN, IOUT = 0
—
0.01
1
μA
ISHDN
Input Shutdown Current
VEN = 0V, OUT open
—
0.01
1
μA
ILEAK
Input Leakage Current
VEN = 0V, OUT grounded
—
0.01
1
μA
VIN = 5.0V
—
80
100
mΩ
VIN = 3.3V
—
95
120
mΩ
VIN = 1.8V
—
160
210
mΩ
VIN = 1.5V
—
210
280
mΩ
VIN = 1.5V to 6V
—
—
0.4
V
—
V
V
RDS(ON)
Parameters
Switch on-resistance
EN Input Logic Low Voltage
VIL
EN Input Logic High Voltage
VIH
ISINK
TD(ON)
TON
EN Input leakage
Output turn-on delay time
Output turn-on rise time
Test Conditions
1.5V ≤ VIN ≤ 2.7V
1.4
—
2.7V < VIN < 5.25V
1.6
—
—
VIN ≥ 5.25V
1.7
—
—
V
VEN = 5V
—
—
1
μA
RLOAD = 10Ω
—
1
—
μS
AP2281-1, RLOAD = 10Ω
—
1000
1500
μS
AP2281-3, RLOAD = 10Ω
—
100
150
μS
TD(OFF)
Output turn-off delay time
RLOAD = 10Ω
—
0.5
1
μS
RDISCH
Discharge FET on-resistance
For AP2281-3 only, VEN = GND
—
65
100
Ω
SOT26 (Note 6)
—
153
—
U-DFN2018-6 (Note 7)
—
78
—
SOT26 (Note 6)
—
29
—
U-DFN2018-6 (Note 7)
—
19
—
θJA
Thermal Resistance Junction-to-Ambient
θJC
Thermal Resistance Junction-to-case
Notes:
°C/W
°C/W
6. Test condition for SOT26: Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
7. Test condition for U-DFN2018-6: Device mounted on FR-4 2-layer board, 2oz copper, with minimum recommended pad on top layer and 3 vias to bottom
layer 1.0"x1.4" ground plane.
AP2281
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AP2281
Typical Performance Characteristics
Quiescent Current vs. Input Voltage
Quiescent Current vs. Temperature
0.010
Q u ie s c e n t C u rre n t (  A )
Quiescent C urren t ( A )
0.01
0.008
0.006
0.004
0.002
0
1.0
2.0
3.0
4.0
5.0
6.0
VIN=1.8V
VIN=3.3V
0.008
VIN=5.0V
0.006
0.004
0.002
0.000
-50
Input Voltage (V)
-25
25
50
75
100
125
Temperature (°C)
RDS(ON) vs. Input Voltage
RDS(ON) vs. Temperature
300.00
200.00
I=100mA
180.00
I=500mA
250.00
160.00
I=1A
I=2A
R DS(O N) (m  )
R DS(O N) (m  )
0
200.00
150.00
140.00
120.00
100.00
100.00
2
2.5
3
3.5
4
4.5
5
5.5
60.00
VIN =1.8V
40.00
VIN =3.3V
20.00
VIN =5V
0.00
-50
50.00
1.5
80.00
6
-25
0
25
50
75
100
Temperature (°C)
Input Voltage (V)
ENABLE Threshold vs. Input Voltage
Input Shutdown Current vs. Temperature
0.010
1.6
0.008
1.4
IS H D N (  A )
O N /O F F T h re s h o ld (V )
1.8
1.2
1.0
0.8
VIH (V)
0.000
0.4
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0.004
0.002
VIL (V)
0.6
0.006
6.0
Input Voltage (V)
AP2281
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-50
-25
0
25
50
75
100
125
Temperature (°C)
November 2013
© Diodes Incorporated
AP2281
Typical Performance Characteristics (cont.)
AP2281-1 Turn-Off
(VIN = 3.3V, RL = 7Ω)
AP2281-1 Turn-On
(VIN = 3.3V, RL = 7Ω)
VEN (5V/div)
VEN (5V/div)
VOUT (2V/div)
VOUT (2V/div)
IIN (500mA/div)
IIN (500mA/div)
Time (500μs/div)
Time (50μs/div)
AP2281-1 Turn-On
(VIN = 5V, RL = 10Ω)
AP2281-1 Turn-Off
(VIN = 5V, RL = 10Ω)
VEN (5V/div)
VEN (5V/div)
VOUT (2V/div)
VOUT (2V/div)
IIN (500mA/div)
IIN (500mA/div)
Time (500μs/div)
Time (50μs/div)
AP2281-3 Turn-On
(VIN = 3.3V, RL = 7Ω)
AP2281-3 Turn-Off
(VIN = 3.3V, RL= 7Ω)
VEN (5V/div)
VEN (5V/div)
VOUT (2V/div)
VOUT (2V/div)
IIN (500mA/div)
IIN (500mA/div)
Time (50μs/div)
AP2281
Document number: DS31359 Rev. 7 - 2
Time (50μs/div)
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AP2281
Typical Performance Characteristics (cont.)
AP2281-3 Turn-Off
(VIN = 5V, RL=10Ω)
AP2281-3 Turn-On
(VIN = 5V, RL = 10Ω)
VEN (5V/div)
VEN (5V/div)
VOUT (2V/div)
VOUT (2V/div)
IIN (500mA/div)
IIN (500mA/div)
Time (50μs/div)
Time (50μs/div)
Application Notes
Input Capacitor
A 1μF capacitor is recommended to connect between IN and GND pins to decouple input power supply glitch and noise. The input capacitor has
no specific type or ESR (Equivalent Series Resistance) requirement. However, for higher current application, ceramic capacitors are
recommended due to their capability to withstand input current surges from low impedance sources, such as batteries in portable applications.
This input capacitor must be located as close as possible to the device to assure input stability and less noise. For PCB layout, a wide copper
trace is required for both IN and GND.
Output Capacitor
A 0.1μF capacitor is recommended to connect between OUT and GND pins to stabilize and accommodate load transient condition. The output
capacitor has no specific type or ESR requirement. The amount of the capacitance may be increased without limit. For PCB layout, the output
capacitor must be placed as close as possible to OUT and GND pins, and keep the traces as short as possible.
ENABLE/SHUTDOWN Operation
The AP2281 is turned on by setting the EN pin high, and is turned off by pulling it low. To ensure proper operation, the signal source used to
drive the EN pin must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section
under VIL and VIH.
DISCHARGE Operation
The AP2281-3 offers discharge option that helps to discharge the output charge when disabled.
Power Dissipation
The device power dissipation and proper sizing of the thermal plane is critical to avoid thermal shutdown and ensure reliable operation. Power
dissipation of the device depends on input voltage and load conditions and can be calculated by:
PD  IOUT 2 xRDSON
(1)
However, the maximum power dissipation that can be handled by the device depends on the maximum junction to ambient thermal resistance,
maximum ambient temperature, and maximum device junction temperature, which can be approximated by the equation below:
PD ([email protected] TA ) 
( 125C  TA )
JA
(2)
For example at VIN = 5V, the typical RDSON = 80mΩ. For IOUT = 2A, the maximum power dissipation calculated using equation (1) is PD = 0.32W.
Based on SOT26
θJA = 153°C/W and equation (2), the calculated junction temperature rise from ambient is approximately 49°C. Since the
maximum junction temperature is 125°C, the operating ambient temperature must be kept below 76°C to safely operate the device.
AP2281
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AP2281
Application Notes (cont.)
On the other hand, at TA = +85°C and VIN = 5V, the calculated maximum power dissipation from equation (2) is approximately PD(MAX) = 0.26W.
Hence the safe operating maximum continuous current is 1.81A. For other application conditions, the users should recalculate the device
maximum power dissipation based on the operating conditions.
Ordering Information
AP2281 - X XX G - 7
Turn-on rise time
Package
Green
1 : 1ms
3 : 100us
W : SOT26
FM : U-DFN2018-6
G : Green
Part Number
Package Code
Packaging
AP2281-1WG-7
AP2281-3WG-7
AP2281-1FMG-7
AP2281-3FMG-7
W
W
FM
FM
SOT26
SOT26
U-DFN2018-6
U-DFN2018-6
Quantity
Packing
7 : Tape & Reel
7” Tape and Reel
Part Number Suffix
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
-7
-7
-7
-7
Marking Information
(1)
SOT26
( Top View )
4
7
5
6
XX Y W X
1
2
3
Device
AP2281-1W
AP2281-3W
(2)
XX : Identification code
Y : Year 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Package Type
SOT26
SOT26
Identification Code
U2
U3
U-DFN2018-6
( Top View )
.
XX
YWX
Device
AP2281-1FM
AP2281-3FM
AP2281
Document number: DS31359 Rev. 7 - 2
XX : Identification code
Y : Year 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Package Type
U-DFN2018-6
U-DFN2018-6
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Identification Code
UE
UF
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© Diodes Incorporated
AP2281
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
(1) SOT26
A
B C
H
K
J
M
D
SOT26
Dim Min Max Typ
A
0.35 0.50 0.38
B
1.50 1.70 1.60
C
2.70 3.00 2.80
D

 0.95
H
2.90 3.10 3.00
J
0.013 0.10 0.05
K
1.00 1.30 1.10
L
0.35 0.55 0.40
M
0.10 0.20 0.15
0°
8°


All Dimensions in mm
L
(2) U-DFN2018-6
U-DFN2018-6
Dim Min Max Typ
A 0.545 0.605 0.575
A1
0
0.05 0.02
A3

 0.13
b
0.15 0.25 0.20
D 1.750 1.875 1.80
D2 1.30 1.50 1.40
e

 0.50
E
1.95 2.075 2.00
E2 0.90 1.10 1.00
L
0.20 0.30 0.25
z

 0.30
All Dimensions in mm
AP2281
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AP2281
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
C2
(1) SOT26
Z
C2
C1
G
Dimensions Value (in mm)
Z
3.20
G
1.60
X
0.55
Y
0.80
C1
C2
Y
2.40
0.95
X
(2) U-DFN2018-6
X
C
Y
Dimensions
C
G
X
X1
Y
Y1
Y1
G
Value (in mm)
0.50
0.20
0.25
1.60
0.35
1.20
X1
AP2281
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AP2281
Taping Orientation
Note:
8. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf
AP2281
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AP2281
IMPORTANT NOTICE
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
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all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
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indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2013, Diodes Incorporated
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