AP2281 Single Slew Rate Controlled Load Switch Description Features • • • • • • • • • • 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: 100us turn-on rise time with internal discharge Very low turn-on quiescent current: << 1uA Fast load discharge option Temperature range -40ºC to 85°C SOT26 and DFN2018-6: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) 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 80mΩ at 5V, 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 0.01uA. Applications • • • • • • Smart Phones PDA Cell Phones GPS Navigators PMP/MP4 Notebook and Pocket PC Ordering Information AP2281 - X XX G - 7 Turn-on rise time Package Green 1 : 1ms 3 : 100us W : SOT26 FM : DFN2018-6 G : Green Device AP2281-1WG-7 AP2281-3WG-7 AP2281-1FMG-7 AP2281-3FMG-7 Notes: Package Code W W FM FM Packaging (Note 2) SOT26 SOT26 DFN2018-6 DFN2018-6 Packing 7 : Tape & Reel 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 3000/Tape & Reel -7 3000/Tape & Reel -7 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf AP2281 Rev. 4 1 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Pin Assignments (Top View) ( Top View ) OUT 1 6 IN IN 1 6 OUT 5 GND IN 2 5 OUT EN 3 4 GND GND 2 EN 3 4 IN DFN2018-6 SOT26 Pin Description Pin Number Pin Name Description SOT26 DFN2018-6 OUT 1 5, 6 GND 2, 5 4 Ground. EN 3 3 Enable input, active high IN 4, 6 1, 2 Voltage output pin. This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1uF capacitor. Voltage input pin. This is the pin to the P-channel MOSFET source. Bypass to ground through a 1µF capacitor. Options Part Number AP2281-1 AP2281-3 AP2281 Rev. 4 Slew Rate (typ) 1ms 100us Active pull down no yes 2 of 13 www.diodes.com Enable Active high Active high FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch For AP2281-3 only Block Diagram Typical Application Circuit VIN VOUT IN 1uF OUT 0.1uF Enable EN GND AP2281 Rev. 4 3 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Absolute Maximum Ratings Symbol ESD HBM Parameter Human Body Model ESD Protection ESD MM Machine Model ESD Protection VIN VOUT VEN Iload TJ TST PD Notes: SOT26 DFN2018-6 Input Voltage Output Voltage Enable Voltage Maximum Continuous Load Current Operating Junction Temperature Range Storage Temperature Range SOT26 (Note 3, 4, 5) Power Dissipation DFN2018-6 (Note 3, 4, 6) Ratings 5 500 450 6.5 VIN + 0.3 6.5 2 -40 ~ 125 -65 ~ 150 720 1410 Unit KV V V V V V A °C °C mW mW 3. TJ, max =125°C. 4. Ratings apply to ambient temperature at 25°C. Recommended Operating Conditions Symbol VIN IOUT TA AP2281 Rev. 4 Parameter Input voltage Output Current Operating Ambient Temperature 4 of 13 www.diodes.com Min 1.5 0 -40 Max 6.0 2.0 85 Unit V A °C FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Electrical Characteristics (TA = 25oC, VIN = 5.0V, unless otherwise stated) Symbol Parameters Test Conditions Input Quiescent Current VEN = VIN, IOUT= 0 IQ Input Shutdown Current VEN = 0V, OUT open ISHDN Input Leakage Current VEN = 0V, OUT grounded ILEAK VIN = 5.0V VIN = 3.3V Switch on-resistance RDS(ON) VIN = 1.8V VIN = 1.5V EN Input Logic Low Voltage VIN = 1.5V to 6V VIL 1.5V ≤ VIN ≤ 2.7V EN Input Logic High Voltage 2.7V < VIN < 5.25V VIH VIN ≥ 5.25V VEN = 5V EN Input leakage ISINK Output turn-on delay time TD(ON) Rload=10Ω AP2281-1, Rload=10Ω Output turn-on rise time TON AP2281-3, Rload=10Ω Output turn-off delay time Rload=10Ω TD(OFF) Discharge FET on-resistance For AP2281-3 only, VEN = GND RDISCH SOT26 (Note 5) Thermal Resistance θJA Junction-to-Ambient DFN2018-6 (Note 6) θJC Notes: Thermal Resistance Junction-to-case Min ⎯ ⎯ ⎯ Typ. 0.01 0.01 0.01 80 95 160 210 1.4 1.6 1.7 ⎯ Max 1 1 1 100 120 210 280 0.4 Unit μA μA μA mΩ mΩ mΩ mΩ V V V V μA μS μS μS μS Ω 1 1 1000 100 0.5 65 153 1500 150 1 100 o C/W o C/W 78 SOT26 (Note 5) 29 DFN2018-6 (Note 6) 19 5. Test condition for SOT26: Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout. 6. Test condition for 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 Rev. 4 5 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch 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 ( μ A ) Quiescent C urrent (μ 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 0 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 R DS(O N) (m Ω ) R DS(O N) (m Ω ) I=1A I=2A 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 Input Voltage (V) 25 50 75 100 Temperature (°C) ENABLE Threshold vs. Input Voltage Input Shutdown Current vs. Temperature 1.8 0.008 1.4 IS H D N ( μ A ) O N /O F F T h re s h o ld (V ) 0.010 1.6 1.2 1.0 0.8 0.004 0.002 VIL (V) 0.6 0.006 VIH (V) 0.000 0.4 -50 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 25 50 75 100 125 Temperature (°C) Input Voltage (V) AP2281 Rev. 4 -25 6.0 6 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Typical Performance Characteristics (Continued) AP2281-1 Turn-On AP2281-1 Turn-Off (VIN=3.3V, RL=7Ω) (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 AP2281-1 Turn-Off (VIN=5V, RL=10Ω) (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) AP2281 Rev. 4 Time (50μs/div) 7 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Typical Performance Characteristics (Continued) AP2281-3 Turn-On AP2281-3 Turn-Off (VIN=3.3V, RL=7Ω) (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) Time (50μs/div) AP2281-3 Turn-On AP2281-3 Turn-Off (VIN=5V, RL=10Ω) (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) AP2281 Rev. 4 Time (50μs/div) 8 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Application Note Input Capacitor Power Dissipation 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. 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: 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. AP2281 Rev. 4 9 of 13 www.diodes.com PD = IOUT xR DSON 2 (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 (max@ TA ) = ( +125°C − TA ) θ 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. On the other hand, at TA = 85°C and VIN = 5V, the calculated maximum power dissipation from equation (2) is approximately PDmax = 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. FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Marking Information (1) SOT26 ( Top View ) 4 7 5 6 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 XX Y W X 1 2 3 Device Package type Identification Code AP2281-1W AP2281-3W SOT26 SOT26 U2 U3 (2) DFN2018-6 ( Top View ) . AP2281 Rev. 4 XX YWX 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 Device Package type Identification Code AP2281-1FM AP2281-3FM DFN2018-6 DFN2018-6 UE UF 10 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Package Information (1) Package type: SOT26 AP2281 Rev. 4 11 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Package Information (Continued) 0.08 C 0.13Typ Seating P lane 2X0.25 A 6X - 0/0.05 0.10 C 0.545/0.605 (2) Package type: DFN2018-6 S id e V ie w C 1.75 /1.875 B A Pin #1 ID 1.3/1.5 CL 0.9/1.1 1.95/2.075 0.2/0.3 CL 0.30T yp 2X - 0.25 B 0.50 T yp 0.15/0.25 0.10 C A B B o tto m V ie w AP2281 Rev. 4 12 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2281 Single Slew Rate Programmable Load Switch Taping Orientation Notes: 7. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP2281 Rev. 4 13 of 13 www.diodes.com FEBRUARY 2009 © Diodes Incorporated