AOZ1321DI. Load Switch with Controlled Slew Rate AOZ1321DI. Features. General Description. Applications. Typical Application

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1 Load Switch with Controlled Slew Rate General Description The AOZ1321DI is a P-channel high-side load switch with controlled slew rate. Three slew rate options are available. The AOZ1321DI-1L and AOZ1321DI-4L have slew rates of 8us. The AOZ1321DI-2L and AOZ1321DI -5L feature fast Slew Rate (less than 1µs). The slew rate of AOZ1321DI-3L and AOZ1321DI-6L is 1µs. The AOZ1321DI-3L, AOZ1321DI-4L, and AOZ1321DI-5L provide an output discharge circuit to quickly discharge the output when the switch is disabled. The P-channel MOSFET has typical on resistance of 6mΩ. The very low R DS(ON) significantly reduces the power path dissipation. The input voltage range of AOZ1321DI is from 1.6V to 5.5V. The control input is compatible with both TTL and CMOS logic. Ultra low quiescent current makes this product suitable for any portable applications. The AOZ1321DI is available in 4-pin 1.2x1.6 DFN package and is rated over the -4 C to +85 C ambient temperature range. Features 1.6V to 5.5V input voltage range Low R DS(ON) (6mΩ typical at 5V) Controlled turn-on slew rate 8µs (AOZ1321DI-1L, -4L) 1µs (AOZ1321DI-3L, -6L) 1µs (AOZ1321DI-2L, -5L) Output discharge function (-3L, -4L, -5L) Low quiescent current (1.µA typical) Low shutdown current (<1µA) 4kV ESD Rating Tiny 1.2x1.6 DFN package Applications Cellular phones MP3 players Personal media players Notebook computers Digital still cameras Hot-swap applications Typical Application V IN IN OUT C1 AOZ1321DI C2 1µF/1µF OFF ON EN GND R1 Rev. 1.1 August 28 Page 1 of 15

2 Ordering Information Part Number Slew Rate Output Discharge Package Environmental AOZ1321DI-4L 8µs Yes AOZ1321DI-1L 8µs No AOZ1321DI-5L 1µs Yes AOZ1321DI-2L 1µs No 1.2 x 1.6 DFN-4 Green Product AOZ1321DI-3L 1µs Yes AOZ1321DI-6L 1µs No All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards. Parts marked as Green Products (with L suffix) use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information. Pin Configuration VOUT 1 4 EN Pad is GND GND 2 3 VIN DFN-4 1.2mm x 1.6mm (Top View) Pin Description Pin Name Pin Number Pin Function IN 3 Input. IN is the drain of the P-channel MOSFET. It is the supply input of the IC. GND 2 Ground. OUT 1 Output. OUT is the source of the P-channel MOSFET. EN 4 Enable. The P-channel MOSFET turns on when EN is logic HIGH. Absolute Maximum Ratings Exceeding the Absolute Maximum ratings may damage the device. Note: Parameter Rating Input Voltage (V IN ) 6V Enable Voltage (V IN ) 6V Continuous Drain Current (I D ) T A = 25 C T A = 85 C ±2A ±1.4A Pulsed Drain Current (I DP ) ±6A Continuous Diode Current (I S ) 5mA Storage Temperature (T S ) 55 C to +15 C ESD Rating (1) 4kV 1. Devices are inherently ESD sensitive, handling precautions are required. Human body model is a 1pF capacitor discharging through a 1.5kΩ resistor. Recommend Operating Ratings The device is not guaranteed to operate beyond the Maximum Operating Ratings. Parameter Rating Input Voltage (V IN ) 1.6V to 5.5V Junction Temperature (T J ) -4 C to +125 C Package Thermal Resistance 1.2 x 1.6 DFN-4 (Θ JA ) 1.2 x 1.6 DFN-4 (Θ JC ) C/W C/W Rev. 1.1 August 28 Page 2 of 15

3 Electrical Characteristics T A = 25 C, V IN = V EN = 5V, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units V EN_TH Enable Threshold Voltage V IN = 1.6V to 4.5V, I D = 25uA V I IN Quiescent Supply Current AOZ1321DI -2L/5L V IN = V EN = 5.5V 1 3 µa AOZ1321DI -1L/3L/4L/6L I OFF OFF State Leakage Current V IN = +5.5V, V EN = V 1 µa R DS(ON) Switch On-Resistance V IN = 5.V, I D = 1mA, V EN = 1.5V 6 85 V IN = 4.5V, I D = 1mA, V EN = 1.5V 62 9 V IN = 3.6V, I D = 1mA, V EN = 1.5V V IN = 2.5V, I D = 1mA, V EN = 1.5V mω V IN = 1.8V, I D = 1mA, V EN = 1.5V V IN = 1.7V, I D = 1mA, V EN = 1.5V V IN = 1.6V, I D = 1mA, V EN = 1.5V R SHUTDOWN Turn-Off Resistance V IN = 3.6V, I TEST = 1mA, V EN = V Ω AOZ1321DI 5L (T R = 1µs with Output Discharge) T D(ON) Output Turn-on delay µs T R Output Rise-time µs V IN = 3.6V, I D = 1mA, V EN = 1.5V T D(OFF) Output Turn-off delay 1 2 ns T F Output Fall-time 2 1 ns AOZ1321DI 2L (T R = 1µs without Output Discharge) T D(ON) Output Turn-On Delay µs T R Output Rise-time µs V IN = 3.6V, I D = 1mA, V EN = 1.5V T D(OFF) Output Turn-Off Delay 1 2 ns T F Output Fall-time 2 1 ns AOZ1321DI 4L (T R = 8µs with Output Discharge) T D(ON) Output Turn-On Delay 32 7 µs T R Output Rise Time µs V IN = 3.6V, I D = 1mA, V EN = 1.5V T D(OFF) Output Turn-Off Delay 6 2 ns T F Output Fall-time 2 1 ns AOZ1321DI 1L (T R = 8µs without Output Discharge) T D(ON) Output Turn-On Delay 32 7 µs T R Output Rise Time µs V IN = 3.6V, I D = 1mA, V EN = 1.5V T D(OFF) Output Turn-Off Delay 6 2 ns T F Output Fall-time 2 1 ns AOZ1321DI 3L (TR = 1µs with Output Discharge) T D(ON) Output Turn-On Delay µs T R Output Rise Time µs V IN = 3.6V, I D = 1mA, V EN = 1.5V T D(OFF) Output Turn-Off Delay 11 2 ns T F Output Fall-time 2 1 ns AOZ1321DI 6L (T R = 1µs without Output Discharge) T D(ON) Output Turn-On Delay µs T R Output Rise Time µs V IN = 3.6V, I D = 1mA, V EN = 1.5V T D(OFF) Output Turn-Off Delay 11 2 ns T F Output Fall-time 2 1 ns Rev. 1.1 August 28 Page 3 of 15

4 Typical Operating Characteristics 9 85 R DS(ON) Variance with Temperature Vds = 3.6V, Id =.1A 1.9 EN Threshold Voltage vs. Input Voltage VIH, Id = -25uA VIL, Id = -25uA RDS(ON) (MΩ) EN Threshold Votlage (V) Temperature ( C) ON Resistance vs. Input Voltage IL = 1.2A IL =.9A IL =.1A ON Resistance vs. Input Voltage Vin=1.8V Vin=2.5V Vin=4.5V RDS(ON) (MΩ) Load Current (A) VDROP) (mv) Turn-on Delay vs. Input Voltage (AOZ1321DI-2L/5L) 8 Rise Time vs. Input Voltage (AOZ1321DI-2L/5L) Turn-On (µs) Rise Time (µs) Rev. 1.1 August 28 Page 4 of 15

5 Typical Operating Characteristics (Continued) Turn-Off (µs) Turn-off Delay vs. Input Voltage (AOZ1321DI-2L/5L) Fall Time (µs) Fall Time vs. Input Voltage (AOZ1321DI-2L/5L) 45 Turn-on Delay vs. Input Voltage (AOZ1321DI-1L/4L) 12 Rise Time vs. Input Voltage (AOZ1321DI-1L/4L) Turn-On (µs) Rise Time (µs) Turn-off Delay vs. Input Voltage (AOZ1321DI-1L/4L) 45 4 Fall Time vs. Input Voltage (AOZ1321DI-1L/4L) Turn-Off (µs) Fall Time (µs) Rev. 1.1 August 28 Page 5 of 15

6 Typical Operating Characteristics (Continued) 35 Turn-on Delay vs. Input Voltage (AOZ1321DI-3L/6L) 12 Rise Time vs. Input Voltage (AOZ1321DI-3L/6L) 3 1 Turn-on (µs) Rise Time (µs) Turn-off Delay vs. Input Voltage (AOZ1321DI-3L/6L) 5 Fall Time vs. Input Voltage (AOZ1321DI-3L/6L) Turn-off (µs) Fall Time (µs) Rev. 1.1 August 28 Page 6 of 15

7 Functional Characteristics AOZ1321DI-2L, AOZ1321DI-5L Turn-On Timing Turn-Off Timing 5mA/div 1mA/div Time: 4µs/div Time: 4µs/div Turn-On Timing Turn-Off Timing 2A/div 1mA/div Time: 1µs/div Time: 4µs/div Rev. 1.1 August 28 Page 7 of 15

8 Functional Characteristics (Continued) AOZ1321DI-1L, AOZ1321DI-4L Turn-On/Turn-Off Timing Turn-Off Timing 1mA/div 1mA/div Time: 1ms/div Time: 4µs/div Turn-On/Turn-Off Timing Turn-Off Timing 1mA/div 1mA/div Time: 1ms/div Time: 4µs/div Rev. 1.1 August 28 Page 8 of 15

9 Functional Characteristics (Continued) AOZ1321DI-3L, AOZ1321DI-6L Turn-On/Turn-Off Timing Turn-Off Timing 1mA/div 1mA/div Time: 1ms/div Time: 4µs/div Turn-On/Turn-Off Timing Turn-Off Timing 1mA/div 1mA/div Time: 1ms/div Time: 4µs/div Rev. 1.1 August 28 Page 9 of 15

10 Timing Diagram EN VIH VIL 9% 9% OUT 1% T D(ON) T D(OFF) T R Figure 1. AOZ1321 Timing Diagram Functional Block Diagram IN OUT EN Gate Driver & Slew Rate Control 16Ω AOZ1321DI GND Figure 2. Functional Block Diagram Rev. 1.1 August 28 Page 1 of 15

11 Detailed Description Internal Discharge Resistor The AOZ1321DI has an internal 16Ω resistor to discharge any remaining voltage from the system to the ground that is store in a capacitive load. This provides a safe shutdown of the system to prevent any damages to the devices. This function is controlled from the Enable pin. Slew Rate Control The AOZ1321DI is a family of P-channel high-side load switches with controlled slew rate. The device is enabled when the EN pin is high. Once enabled, the gate driver and slew-rate control circuitry immediately raises the source-to-gate voltage of the P-channel MOSFET to its threshold level, and then gradually turns on the MOSFET by linearly increasing the source-to-gate voltage. This slow turn-on action effectively limits the input inrush current and provides a nice ramp for the output voltage. After the MOSFET is fully enhanced, the AOZ1321DI quickly increases the source-to-gate voltage to the full input voltage to minimize on resistance and reduce power dissipation. Three slew-rate options are available. AOZ1321DI-1L and AOZ1321DI-4L have slew rate of 8us. This option significantly reduces the inrush current when the MOSFET turns on, allowing the use of very small input capacitor. AOZ1321DI-2L and -5L have no slew rate control and the MOSFET can be turned on within 1us. This option is suitable for applications that require very fast switching. AOZ1321DI-3L and -6L have moderate slew rate to 1µs. The AOZ1321DI-3L, -4L and -5L options include an internal output discharge circuit that quickly discharges the output to ground when the device is disabled. On/Off Control The AOZ1321DI is enabled when the EN pin is asserted high. The device is disabled when the EN pin is asserted low. The EN input is compatible with both TTL and CMOS logic. Applications Information Input Capacitor Selection Use a 1µF or larger capacitor for input bypassing. Place the capacitor close to the IN pins of AOZ1321DI. Output Capacitor Selection Use a.1µf or larger capacitor between OUT and GND. The capacitance does not affect the turn-on slew rate. However, a larger capacitor makes the initial turn-on transient smoother. Rev. 1.1 August 28 Page 11 of 15

12 Layout Guidelines Good PCB is important for improving the thermal performance of AOZ1321DI. Place the input and output bypass capacitors close to the IN and OUT pins. The input and output PCB traces should be as wide as possible for the given PCB space. Use a ground plane to enhance the power dissipation capability of the device. The AOZ1321DI evaluation board can be used as a layout example. The PCB layout of AOZ1321DI evaluation board is shown in Figure 3. Figure 3. AOZ1321DI PCB Layout Rev. 1.1 August 28 Page 12 of 15

13 Package Dimensions, DFN 1.2 x 1.6 4L Pin 1 Dot E E1 Pin #1 ID R.1 Seating Plane A3 D D1 b e Exposed Pad A A1 TOP VIEW BOTTOM VIEW SIDE VIEW RECOMMENDED LAND PATTERN UNIT: mm Dimensions in millimeters Symbols A A1 A3 b E E1 D D1 e L aaa bbb ccc Min Nom REF BSC Max Dimensions in inches Symbols A A1 A3 b E E1 D D1 e L aaa bbb ccc Min..2 Nom..22 Max REF BSC Notes: 1. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact. 2. Coplanarity ccc applies to the terminals and all other bottom surface metallization. Rev. 1.1 August 28 Page 13 of 15

14 Tape and Reel Dimensions, DFN 1.2 x 1.6 4L Carrier Tape K P1 P2 D D1 E1 B E2 E T 5 B B' Section P A 5 E3 Feeding Direction UNIT: mm A A' Section Package T B A K D D1 E E1 E2 P P1 P2 DFN 1.2x ± ± ±.5.78 ±.5 ø1.5 ±.1 ø.6 ± / ± ±.5 4. ±.1 4. ±.1 2. ±.5 Reel W1 S K M N E H Section: A A' Section: B B' Arbor Hole Detail A Scale 2:1 Front View UNIT: mm Tape Size Reel Size M N W W1 H S K E 8mm ø149 ø179. ±.5 ø55. ± / Max. ø / Min. 1.1 Min. 2.7 ±.2 Leader / Trailer & Orientation Trailer Tape 3mm Min. Components Tape Orientation in Pocket Leader Tape 5mm Min. Rev. 1.1 August 28 Page 14 of 15

15 Package Marking DFN 1.2 x 1.6 Part Number Code Underline Denotes Green Product $P $W $L Week Lot Number Alpha & Omega Semiconductor reserves the right to make changes at any time without notice. LIFE SUPPORT POLICY ALPHA & OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Rev. 1.1 August 28 Page 15 of 15

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