AOZ1353DI-01

AOZ1353DI 5V/3A ECPower™ Smart Current Limited Load Switch with True Reverse-Current Blocking General Description Features The AOZ1353DI is a current-limited load switch targeting applications that require comprehensive protections. The input operating voltage range is between 3.4V and 5.5V. The output terminal is rated 28V absolute maximum. The internal current-limiting circuit protects the supply from large load current. The current limit level is set with an external resistor. The soft-start circuit controls inrush current due to highly capacitive loads. The soft-start time can be optionally adjusted with an external capacitor. The device features very low quiescent current of 80µA. The supply current reduces to less than 1µA in shutdown. It also has under-voltage lockout (UVLO), overvoltage protection (OVP) and thermal shutdown protection.  28V voltage rating on VOUT pin  3.4V to 5.5V operating input voltage  3.5A current capability  Typical RON: 40mΩ  Programmable current limit  True Reverse-Current Blocking (TRCB)  Fast recovery from TRCB  Adjustable soft-start  80µA quiescent current  Over-voltage protection  Input under-voltage lockout  Thermal shutdown protection  ±4kV HBM rating  ±1kV CDM Rating  3mm x 3mm DFN-12L Package  UL2367 file no. E326264  IEC60950 CB Certificate no. US-31249-UL The AOZ1353DI has True Reverse-Current Blocking (TRCB) protection to avoid undesired reverse-current from VOUT to VIN. The device features fast recovery to turn on power switch once reverse current blocking protection is de-activated. The AOZ1353DI is available in 3mm x 3mm DFN-12L package. Applications  USB PD power source switch  Smart phone and tablet  Notebook, ultrabook and desktop  Portable devices Typical Application VIN VOUT COUT CIN AOZ1353DI ILIM RLIM RFLTB FLTB ON OFF Rev. 1.2 February 2018 EN GND SS www.aosmd.com CSS Page 1 of 16 AOZ1353DI Ordering Information Part Number Fault Recovery Package Environmental AOZ1353DI-01 Auto-Restart 3mm x 3mm DFN-12L RoHS AOZ1353DI-02 Latch-Off 3mm x 3mm DFN-12L RoHS All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards. Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information. Pin Configuration VOUT ` VOUT VOUT VIN VIN EXP FLTB VIN EN SS ILIM NC GND 3mm x 3mm DFN-12L (Top Transparent View) Pin Description Pin Number Pin Name Pin Function 1, 2, 3 VOUT Power output. Connect to adaptor. Pin 3 is internally connected to pin 1 and pin 2. 4 FLTB Fault indicator, open-drain output, active-low when fault condition occurs. 5 SS Soft-start pin. Connect a capacitor CSS from SS to GND to set the soft-start time or short to GND for fixed-time soft-start. Not connected internally. Can leave it floated or connect to GND. 6 NC 7 GND Ground 8 ILIM Current limit set pin. Connect a 1% resistor RLIM from ILIM to GND to set the current limit threshold. 9 EN Enable input. Active high. 10, 11, 12 VIN Supply input. Connected to internal power regulator. Pin 10 is internally connected to pin 11 and pin 12. EXP EXP Exposed pad. Connect to GND. Rev. 1.2 February 2018 www.aosmd.com Page 2 of 16 AOZ1353DI Absolute Maximum Ratings Recommended Operating Ratings Exceeding the Absolute Maximum Ratings may damage the device. The device is not guaranteed to operate beyond the Maximum Operating Ratings. Parameter Rating VOUT to GND Parameter -0.3V to +28V VIN, EN, ILIM, SS, FLTB to GND Junction Temperature (TJ) VIN to GND -0.3V to +6V 0V to 5.5V Switch Current (ISW) -65°C to +150°C ESD Rating HBM/CDM 3.4V to 5.5V EN, FLTB to GND +150°C Storage Temperature (TS) Rating 0A to 3.5A Ambient Temperature (TA) ±4kV / ±1kV -40°C to +85°C Package Thermal Resistance 50°C/W Electrical Characteristics TA = 25°C, VIN = 5V, SS pin is shorted to GND unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units 5.5 V 3.35 V General VIN Input Supply Voltage 3.4 VUVLO_R Under-voltage Lockout Threshold VIN rising VUVLO_HYS 3 3.25 Under-voltage Lockout Hysteresis VIN falling 150 mV IIN_ON Input Quiescent Current VIN = 5V, IOUT = 0A, EN = 5V 80 µA IIN_OFF Input Shutdown Current VIN = 5V, EN = 0V 0.1 Switch On Resistance VIN = 5V, IOUT = 1A 40 RON VEN_H Enable Input Logic High Threshold EN rising VEN_L Enable Input Logic Low Threshold EN falling IEN_BIAS Enable Input Bias Current EN = 1.8V VFLTB_LO FLTB Pull-down Voltage ISINK = 3mA 1 µA mΩ 1.4 V 1 0.4 V 1.5 µA 0.3 V Over-Voltage Protection VOVLO_R VOVLO_F Over-voltage Lockout Threshold VOVLO_HYS Over-voltage Lockout Hysteresis TDELAY_OVP OVP Turn-Off Delay VIN rising 5.5 VIN falling 5.75 6 5.5 Time between VIN rises from 5V to 6.5V and power switch turns off V 250 mV 2 µs Over-Current Protection VOUT = 5V, RLIM = 4.02kΩ ILIM TOCP_FLTB Current Limit Threshold Over-Current Flag Delay 3.08 3.5 3.92 VOUT = 5V, RLIM = 14.3kΩ 0.9 1 1.1 VOUT = 5V, RLIM = 29.4kΩ 0.45 0.5 0.55 A From IOUT ≥ ILIM to FLTB pulled low 12 ms Reverse-Current Blocking VT_RCB RCB Protection Trip Point VOUT-VIN, VOUT rising 60 mV VR_RCB RCB Protection Release Trip Point VIN-VOUT, VOUT falling 70 mV RCB Hysteresis VT_RCB + VR_RCB 130 mV 2 µs VRCB_HYS TRCB RCB Response Time Rev. 1.2 February 2018 www.aosmd.com Page 3 of 16 AOZ1353DI Electrical Characteristics TA = 25°C, VIN = 5V, SS pin is shorted to GND unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units Thermal Shutdown TSD Thermal Shutdown Threshold Temperature rising 140 TSD_HYS Thermal Shutdown Hysteresis Temperature falling 20 Turn-On Delay Time (From VEN 50% to VOUT=0.5V) VIN = 5V, RL = 100, COUT = 1F, CSS = 1nF, RLIM = 14.3kΩ 2.1 ms Turn-ON Time (VOUT from 0.5V to 4.5V) VIN = 5V, RL = 100, COUT = 1F, SS Pin grounded, RLIM = 14.3kΩ 3.4 ms °C Dynamic Characteristics TD_ON TON Rev. 1.2 February 2018 www.aosmd.com Page 4 of 16 AOZ1353DI Functional Block Diagram VOUT VIN VCC Gate Drive & Charge Pump SS Current Limit VIN VOUT UVLO OVLO TRCB Control Logic ILIM FLTB EN GND Rev. 1.2 February 2018 www.aosmd.com Page 5 of 16 AOZ1353DI Timing Diagrams EN TD_ON VOUT TON Figure 1. Turn-on Delay and Turn-on Time VIN TDELAY_OVP VOUT Figure 2. OVP Delay and Recovery Rev. 1.2 February 2018 www.aosmd.com Page 6 of 16 AOZ1353DI Typical Performance Curves TA = 25°C, COUT = 20µF, RLIM = 4.02k, SS pin shorted to GND unless otherwise specified. Figure 3. Startup by EN (RLoad = 1.6Ω) Figure 4. Shutdown by EN (RLoad = 1.6Ω) Figure 5. Startup by VIN (RLoad = 1.6Ω) Figure 6. Shutdown by VIN (RLoad = 1.6Ω) Figure 7. Input Over-Voltage Protection and Recovery (RLoad = 1kΩ, AOZ1353DI-01) Figure 8. Over-Current Protection (RLOAD = 1Ω, AOZ1353DI-01) Rev. 1.2 February 2018 www.aosmd.com Page 7 of 16 AOZ1353DI Typical Performance Curves (Continued) TA = 25°C, COUT = 20µF, RLIM = 4.02k, SS pin shorted to GND unless otherwise specified. Figure 9. Output Hard Short and Thermal Shutdown (AOZ1353DI-01) Rev. 1.2 February 2018 www.aosmd.com Page 8 of 16 AOZ1353DI Typical Characteristics 55.0 48.0 50.0 46.0 45.0 44.0 RON (m) RON (m) TA = 25°C, VIN = 5V unless otherwise specified. 40.0 35.0 42.0 40.0 30.0 38.0 25.0 36.0 20.0 -50 -30 -10 10 30 70 50 34.0 3.0 90 3.5 4.0 5.5 6.0 0.8 100 Input Shutdown Current (µA) 90 Input Quiescent Current (µA) 5.0 Figure 11. RON vs. Input Voltage Figure 10. RON vs. Temperature 80 70 60 50 40 30 20 10 0 -50 -30 -10 10 30 50 70 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -50 90 -30 -10 Temperature (C) 10 30 50 70 90 Temperature (C) Figure 12. Input Quiescent Current vs. Temperature Figure 13. Input Shutdown Current vs. Temperature 1.5 1.2 1.4 Rising 1.0 Enable Bias Current (µA) Enable Threshold Voltage (V) 4.5 Voltage (V) Temperature (C) Falling 0.8 0.6 0.4 0.2 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.0 -50 -30 -10 10 30 50 70 90 0.6 -50 Temperature (°C) -10 10 30 50 70 90 Temperature (°C) Figure 14. EN Threshold vs. Temperature Rev. 1.2 February 2018 -30 Figure 15. EN Bias Current vs. Temperature www.aosmd.com Page 9 of 16 AOZ1353DI Typical Characteristics (Continued) TA = 25°C, VIN = 5V unless otherwise specified. 5.80 3.20 5.75 Rising OVP Threshold Voltage (V) UVLO Threshold Voltage (V) 3.24 3.16 3.12 3.08 Falling 3.04 3.00 -50 Rising 5.70 5.65 5.60 5.55 Falling 5.50 5.45 -30 -10 10 30 50 70 5.40 -50 90 -30 -10 Figure 16. UVLO Threshold vs. Temperature 30 50 70 90 Figure 17. OVP Threshold vs. Temperature 4.0 3.5 10 Temperature (°C) Temperature (°C) 80.0 RLIM = 4.02 k 70.0 3.0 VT_RCB (mV) ILIM (A) 2.5 2.0 1.5 RLIM = 14.3 k 1.0 0.0 -50 -30 -10 10 30 50 70 50.0 40.0 30.0 RLIM = 29.4 k 0.5 60.0 20.0 -50 90 -30 -10 Temperature (°C) 80.0 2.70 70.0 2.50 60.0 50.0 40.0 30.0 -30 -10 10 30 50 70 90 50 70 90 2.30 2.10 1.90 1.70 1.50 -50 Temperature (°C) -30 -10 10 30 50 70 90 Temperature (°C) Figure 20. RCB Threshold (Falling) vs. Temperature Rev. 1.2 February 2018 30 Figure 19. RCB Threshold (Rising) vs. Temperature Turn-On Delay Time (ms) VR_RCB (mV) Figure 18. Current Limit Threshold vs. Temperature 20.0 -50 10 Temperature (°C) www.aosmd.com Figure 21. Turn-On Delay vs. Temperature Page 10 of 16 AOZ1353DI Typical Characteristics (Continued) TA = 25°C, VIN = 5V unless otherwise specified. 4.0 4.0 3.5 SS Pin Grounded 3.0 3.0 2.5 2.5 ILIM (A) Turn-On Time (ms) 3.5 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0.0 -50 -30 -10 10 30 50 70 90 0.0 Temperature (°C) 5 10 15 20 25 30 35 40 RLIM (k) Figure 22. Turn-On Time vs. Temperature Rev. 1.2 February 2018 0 Figure 23. Current Limit vs. RLIM www.aosmd.com Page 11 of 16 AOZ1353DI Functional Description True Reverse-Current Blocking Protection (TRCB) The AOZ1353DI is a current limited power switch with over-voltage, over-current, reverse-current and thermal shutdown protections. The VOUT pin is rated 28V. The operating input voltage ranges from 3.4V to 5.5V. The switch current is rated up to 3.5A. True reverse-current blocking prevents undesired current flow from output to input when power switch is in either on or off state. When device is enabled, power switch is quickly turned off whenever output voltage is higher than input voltage. The power switch is turned on again when output voltage falls below input by 70mV. The device has true reverse-current blocking features that will prevent undesired current flow from output to its input in either enabled or disabled state. Enable The EN pin is the ON/OFF control for the power switch. The device is enabled when EN pin is high and not in under-voltage lockout state. The EN pin must be driven to a logic high or logic low state to guarantee operation. While disabled, the AOZ1353DI draws less than 1μA from supply. For AOZ1353DI-02, toggle EN pin to restart the device and clear fault flag after device latches off due to fault. Input Under-Voltage Lockout (UVLO) The under-voltage lockout (UVLO) circuit monitors the input voltage. The power switch is only allowed to turn on when input voltage is higher than UVLO threshold. Otherwise the switch is off. Over-Voltage Protection (OVP) The voltages at VIN terminal is constantly monitored once the device is enabled. In case input voltage exceeds the over-voltage lockout threshold (VOVLO_R), the power switch is either turned off immediately or kept off, depending on its initial state. AOZ1353DI-01 can restart when VIN drops below VOVLO_F. Fast Recovery (For AOZ1353DI-01 only) Once RCB event is removed, power switch turns on again quickly. The recovery time is less than 100µs. Thermal Shutdown Protection Thermal shutdown protects device from excessive temperature. The power switch is turned off when the die temperature reaches thermal shutdown threshold of 140°C. There is a 20°C hysteresis. For AOZ1353DI-01 power switch is allowed to turn on again if die temperature drops below approximately 120°C. Soft Start The AOZ1353DI has soft-start circuitry to limit in-rush current due to large capacitive load. By default the turn-on time is 3.4ms when SS pin is connected to GND. Fast turn-on time can be set by adding an external capacitor CSS between SS pin and ground. The capacitor value is selected using Table 1. Table 1. Turn-On Time Settings by Css Css (nF) Turn-On Time (ms) 1 0.3 1.2 0.4 Programmable Current Limit and Over-Current Protection (OCP) 2.2 0.8 3.3 1.2 The AOZ1353DI implemented current limit to ensure that the current through the switch does not exceed current limit threshold set by the external resistor RLIM. 4.7 1.7 5.6 1.9 The current limit threshold can be estimated using the equation below: 6.8 2.4 8.2 2.8 10 3.2 12 3.4 SS pin short to GND 3.4 ILIM = 14300/RLIM (A) For example, for 1A current limit threshold, a 14.3kΩ RLIM resistor should be selected. 1% resistor is recommended for RLIM. AOZ1353DI continuously limits the output current when output is overloaded, Under current-limiting, FLTB is pulled low after delay (TOCP_FLTB). Severe overload causes power dissipation and die temperature to increase and may trigger thermal shutdown. Rev. 1.2 February 2018 Startup The device is enabled when EN ≥ VEN_H and input voltage is above UVLO threshold. The device first checks if any fault condition exists. When no fault exists, the power switch is turned on and the output is then ramped up. Power switch is kept off if fault condition was detected. www.aosmd.com Page 12 of 16 AOZ1353DI Fault Reporting Output Capacitor Selection AOZ1353DI protects itself and load from the following fault condition: over-voltage, over-current, reversecurrent, and over-temperature. The output capacitor acts in a similar way. Also, the output capacitor has to supply enough current for a large load that it may encounter during system transient. This bulk capacitor must be large enough to supply fast transient load in order to prevent the output from dropping. The FLTB pin is an open drain output. It is asserted low when either an over-current, or over-temperature condition occurs. The FLTB pin becomes high impedance when the fault conditions are removed. A pull-up resistor (RFLTB) must be connected between FLTB to 5V to provide a logic signal. When thermal shutdown is activated, FLTB is pulled low immediately to report fault condition to host. FLTB is pulled high once fault is removed. There is an upper limit for output capacitor for AOZ1353DI to ensure the output capacitor can be charged fully during start-up. This upper limit is set by the current limit level and soft-start time. Cout = ILIM × (TON / VIN) Power Dissipation Calculation In case of output overload, FLTB pin is pulled low about 12ms (TOCP_FLTB) after device is in current- limiting. For AOZ1353DI-02 power switch is then turned off after another 12ms. Calculate the power dissipation for normal load condition using the following equation: There is no fault reporting for UVLO, OVP and RCB event. The worst case power dissipation occurs when the load current hits the current limit due to over-current. The power dissipation can be calculated using the following equation: Auto-restart or Latch-off Power Dissipated = RON × (IOUT)2 AOZ1353DI-01 (auto-restart version): The device will try to restart 24ms after the power switch is turned off and when OVP or thermal shutdown fault is removed. Power Dissipated = (VIN – VOUT) × ILIM Power switch is turned on immediately after a RCB event is removed. Good PCB layout is important for improving the thermal and overall performance of AOZ1353DI. To optimize the switch response time to output short-circuit conditions, keep all traces as short as possible to reduce the effect of unwanted parasitic inductance. Place the input and output bypass capacitors as close as possible to the VIN and VOUT 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. AOZ1353DI-02 (latch-off version): The device keeps off even after the fault condition is removed. Power switch can only be turned on again by either toggle EN pin or recycle the input supply. Input Capacitor Selection The input capacitor prevents large voltage transients from appearing at the input, and provides the instantaneous current needed each time the switch turns on to charge output capacitors and to limit input voltage drop. It is also to prevent high-frequency noise on the power line from passing through to the output. The input capacitor should be located as close to the pin as possible. A minimum of 10μF ceramic capacitor should be used. However, higher capacitor value is strongly recommended to further reduce the transient voltage drop at the input. Rev. 1.2 February 2018 Layout Guidelines www.aosmd.com Page 13 of 16 AOZ1353DI Package Dimensions, DFN3x3B_12L, EP1_S RECOMMENDED LAND PATTERN SYMBOLS UNIT: mm A A1 b b1 c D D1 E E1 e L L1 L2 aaa bbb ccc ddd DIMENSIONS IN MILLIMETERS MIN             NOM          %6&        DIMENSIONS IN INCHES MAX          MIN                NOM          %6&        MAX             NOTE 1. DIMENSIONING AND TOLERANCING CONFORM TO ASME Y14.5M-1994. 2. CONTROLLING DIMENSION IS MILLIMETER. CONVERTED INCH DIMENSIONS ARE NOT NECESSARILY EXACT. 3. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.15mm. AND 0.30mm FROM THE TERMINAL TIP. IF THE TERMINAL HAS THE OPTIONAL RADIUS ON THE OTHER END OF THE TERMINAL, THE DIMENSION b SHOULD NOT BE MEASURED IN THAT RADIUS AREA. 4. COPLANARITY ddd APPLIERS TO THE TERMINALS AND ALL OTHER BOTTOM SURFACE METALLIZATION. Rev. 1.2 February 2018 www.aosmd.com Page 14 of 16 AOZ1353DI Tape and Reel Drawing DFN3x3 EP Carrier Tape Reel DFN3x3 EP TAPE Leader / Trailer & Orientation Rev. 1.2 February 2018 www.aosmd.com Page 15 of 16 AOZ1353DI Part Marking AOZ1353DI (DFN3x3) AG00 Option Code Special Code Part Number Code YWLT Year Code Part Number Week Code Assembly lot Code Description Code AOZ1353DI-01 Green Product AG01 AOZ1353DI-02 Green Product AG02 LEGAL DISCLAIMER Applications or uses as critical components in life support devices or systems are not authorized. AOS does not assume any liability arising out of such applications or uses of its products. AOS reserves the right to make changes to product specifications without notice. It is the responsibility of the customer to evaluate suitability of the product for their intended application. Customer shall comply with applicable legal requirements, including all applicable export control rules, regulations and limitations. AOS' products are provided subject to AOS' terms and conditions of sale which are set forth at: http://www.aosmd.com/terms_and_conditions_of_sale LIFE SUPPORT POLICY ALPHA AND 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. Rev. 1.2 February 2018 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. www.aosmd.com Page 16 of 16