AP2337SA-7

AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Description The AP2337 is single channel current-limited integrated highside power switches optimized for hot-swap applications. The devices have fast short-circuit response time for improved overall system robustness and provide a complete protection solution for application subject to heavy capacitive loads and the prospect of short circuit. It offers reverse current blocking, over-current, over-temperature and short-circuit protection, as well as controlled rise time and under-voltage lockout functionality. Pin Assignments ( Top View ) GND 1 3 IN OUT 2 SOT23 N EW PRODUCT The device is available in SOT23 package. Features • • • • • • • • • • • • • • • Input voltage range: 2.7V – 5.5V Fast short-circuit response time 1.5A accurate current limiting 110mΩ on-resistance Reverse Current Blocking Built-in soft-start with 2.5ms typical turn-on time Over Current Protection Over Voltage Protection Short circuit and thermal protection ESD protection: 3KV HBM, 300V MM Ambient temperature range: -40ºC to 85°C Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) UL Recognized, File Number E322375 (to be completed) IEC60950-1 CB Scheme Certified (to be completed) Applications • • • • • LCD TVs & Monitors Set-Top-Boxes, Residential Gateways Laptops, Desktops, Servers Printers, Docking Stations, HUBs Smart phones, e-Readers Notes: 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. Typical Application Circuit Power Supply 2.7V to 5.5V IN OUT 0.1µF GND Load 0.1µF AP2337 Document number: DS35060 Rev. 2 - 2 1 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Pin Descriptions Pin Name GND OUT IN Pin Number 1 2 3 Ground Switch output pin Voltage input pin Descriptions Function Block Diagram N EW PRODUCT Reverse Voltage Comparator + Reverse Current Limit IN Current Sense UVLO Current Limit 0.6ms Deglitch Time 15us Deglitch Time Discharge Control OUT Driver GND Thermal Sense Absolute Maximum Ratings Symbol ESD HBM ESD MM VIN VOUT Iload TJmax TST Notes: Parameter Human Body Model ESD Protection Machine Model ESD Protection Input Voltage Output Voltage Maximum Continuous Load Current Maximum Junction Temperature Storage Temperature Range (Note 2) Ratings 3 300 6.5 VIN + 0.3 Internal Limited 150 -65 to 150 Units KV V V V A °C °C 2. UL Recognized Rating from -30°C to 70°C (Diodes qualified TST from -65°C to 150°C) AP2337 Document number: DS35060 Rev. 2 - 2 2 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Recommended Operating Conditions Symbol VIN IOUT TA Parameter Input voltage Output Current Operating Ambient Temperature Min 2.7 0 -40 Max 5.5 1.0 85 Units V A °C Electrical Characteristics (TA = 25oC, VIN = +5.0V, unless otherwise stated) N EW PRODUCT Symbol VUVLO IQ IREV RDS(ON) ILIMIT IOS Parameter Input UVLO Input quiescent current Reverse leakage current Switch on-resistance Over-load current limit Short-circuit current Test Conditions (Note 3) VIN rising Above UVLO, IOUT= 0 VIN = 0V, VOUT = 5V, IREV at VIN VIN = 5V, IOUT = 1A VIN = 3.3V, IOUT = 1A VIN = 5V, VOUT = 4V, CL=10μF OUT connected to ground, CL=10μF From VOUT < 0.6V to IOUT = 0A (OUT shorted to GND) (See Figure. 1)(Note 7) Above UVLO Min 2.00 Typ. 65 0.01 110 140 1.5 0.6 5 0.3 0.5 0.6 Above UVLO (Note 4) 110% 15 CL = 1μF, Rload = 5Ω (UVLO to 90% VOUT-NOM) CL= 1μF, from UVLO to VOUT < 0.3V 1 500 150 20 180 o 1.1 0.2 Max 2.65 110 0.1 140 170 1.9 1.0 Unit V μA μA mΩ A A μs TSHORT Short-circuit response time IROCP TTrig VOVP TOVP TON TDIS TSHDN THYS θJA Notes: Reverse current limit Deglitch time from reverse current trigger to MOSFET turn off Output over-voltage trip point Debounce time from output overvoltage to MOSFET turn off Output turn-on time (Note 5) Discharge time Thermal shutdown threshold Thermal shutdown hysteresis Thermal Resistance Junction-toAmbient 0.7 A ms 120% VIN μs 4 ms μs °C °C C/W (Note 6) 3. Pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account separately. 4. During output over-voltage protection, the output draws approximately 60µA current. 5. Since the output turn-on slew rate is dependent on input supply slew rate, this limit is only applicable for input supply slew rate between 5V/0.2ms to 5V/1ms. 6. Device mounted on FR-4 substrate PCB, 2oz copper, with minimum recommended pad layout. 7. Applicable for output voltage slew rate ≤ 5V/30μs. Figure 1. Short Circuit Response Time AP2337 Document number: DS35060 Rev. 2 - 2 3 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Typical Performance Characteristics UVLO Increasing UVLO Decreasing N EW PRODUCT 1ms/div Over-Load Current Limit 5ms/div Short Circuit Current Limit CL=10uF CL=10uF 50ms/div 100us/div Output Over Voltage Trip Point Debounce time from output over-voltage to MOSFET turn off (Zoom in at red portion of previous waveform) OV trip at 114% of Vin, Vin=5V TOVP 12 µ s 500us/div 20us/div AP2337 Document number: DS35060 Rev. 2 - 2 4 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Typical Performance Characteristics (cont.) Deglitch time from reverse current trigger to MOSFET turn off Reverse Current Limit N EW PRODUCT 500us/div Output Turn-on Time 500us/div Discharge Time 1ms/div 5ms/div AP2337 Document number: DS35060 Rev. 2 - 2 5 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Typical Performance Characteristics (cont.) 95 90 85 SUPPLY CURRENT (µA) 80 75 70 65 60 55 50 -40 95 90 85 SUPPLY CURRENT (µA) 80 75 70 65 60 55 50 -40 N EW PRODUCT -20 0 20 40 60 80 AMBIENT TEMPERATURE (°C) Fig. 1 Quiescent Supply Current vs. Ambient Temperature 3.5 3 OUTPUT TURN ON-TIME (ms) 2.5 2 1.5 1 0.5 0 2.5 -20 0 20 40 60 80 AMBIENT TEMPERATURE (°C) Fig. 1 Quiescent Supply Current vs. Ambient Temperature 200 180 ON-STATE RESISTANCE (mΩ) CL = 1µF RL = 5Ω 160 140 120 100 80 60 40 20 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) Fig. 3 Output Turn On-Time vs. Input Voltage 3 6 0 -40 -20 0 20 40 60 80 AMBIENT TEMPERATURE (°C) Fig. 4 Switch On-Resistance vs. Ambient Temperature 1.46 600 REVERSE CURRENT LIMIT (mA) OVERLOAD CURRENT LIMIT (A) 1.45 580 1.44 560 1.43 540 1.42 520 1.41 500 -20 0 20 40 60 80 AMBIENT TEMPERATURE (°C) Fig. 5 Current Limit Trip Threshold vs. Ambient Temperature 1.4 -40 480 -40 -20 0 20 40 60 80 AMBIENT TEMPERATURE (°C) Fig. 6 Reverse Current Limit vs. Ambient Temperature AP2337 Document number: DS35060 Rev. 2 - 2 6 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Application Note Protection Features: Under-voltage Lockout (UVLO) Whenever the input voltage falls below UVLO threshold (~2.5V), the power switch is turned off. This facilitates the design of hot-insertion systems where it is not possible to turn off the power switch before input power is removed. Over-current and Short Circuit Protection N EW PRODUCT An internal sensing FET is employed to check for over-current conditions. Unlike current-sense resistors, sense FETs do not increase the series resistance of the current path. When an overcurrent condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Complete shutdown occurs only if the fault stays long enough to activate thermal limiting. The different overload conditions and the corresponding response of the AP2337 are outlined below: NO Conditions Short circuit condition at start-up Explanation Output is shorted before input voltage is applied or before the part is powered up. Behavior of the AP2337 The IC senses the short circuit and immediately clamps output current to a certain safe level namely Ishort • At the instance the overload occurs, higher current may flow for a very short period of time before the current limit function can react. • After the current limit function has tripped (reached the over-current trip threshold), the device switches into current limiting mode and the current is clamped at Ishort /ILIMIT. The current rises until ILIMIT. Once the threshold has been reached, the device switches into its current limiting mode and is clamped at ILIMIT. 1 2 Short-circuit or Overcurrent condition Short-Circuit or Overload condition that occurs when the part is powered up and above UVLO. 3 Gradual increase from nominal operating current to ILIMIT Load increases gradually until the current-limit threshold. Reverse Current Protection The USB specification does not allow an output device to source current back into the USB port. In a normal MOSFET switch, current will flow in reverse direction (from the output side to the input side) when the output side voltage is higher than the input side. A reverse current limit feature is implemented in the AP2337 to limit such back currents. This circuit is activated by the difference between the output voltage and the input voltage (100mV TYP). After the reverse current circuit has tripped (reached the reverse current trip threshold), the current rises until IROCP level. When the fault exists for more than 600us, output device is disabled and shutdown. This is called the "Deglitch time from reverse current trigger to MOSFET turn off”. Recovery from IROCP occurs when the output voltage falls to 101% of input voltage. Over-Voltage Protection The device has an output over-voltage protection that triggers when the output voltage reaches 114% (TYP) of input voltage. When this fault condition stays on for longer than 15us (This is called the “Debounce time from output over-voltage to MOSFET turn off” ) output device is disabled and shutdown. Recovery from ROVP occurs when the output voltage falls to 101% of input voltage. AP2337 Document number: DS35060 Rev. 2 - 2 7 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Application Note (cont.) Thermal Protection Thermal protection prevents the IC from damage when the die temperature exceeds safe margins. This mainly occurs when heavy-overload or short-circuit faults are present for extended periods of time. The AP2337 implements a thermal sensing to monitor the operating junction temperature of the power distribution switch. Once the die temperature rises to approximately 150°C, the Thermal protection feature gets activated as follows: The internal thermal sense circuitry turns the power switch off thus preventing the power switch from damage. Hysteresis in the thermal sense circuit allows the device to cool down to approximately 20°C before the output is turned back on. This built-in thermal hysteresis feature is an excellent feature, as it avoids undesirable oscillations of the thermal protection circuit. The switch continues to cycle in this manner until the load fault is removed, resulting in a pulsed output. N EW PRODUCT Discharge Function When input voltage is pulled, the discharge function is active. The output capacitor is discharged through an internal NMOS that has a discharge resistance of 100Ω. Hence, the output voltage drops down to zero. The time taken for discharge is dependent on the RC time constant of the resistance and the output capacitor. Discharge time is calculated when UVLO falling threshold is reached to output voltage reaching 300mV. Power Dissipation and Junction Temperature The low on-resistance of the internal MOSFET allows the small surface-mount packages to pass large current. Using the maximum operating ambient temperature (TA) and RDS(ON), the power dissipation can be calculated by: PD = RDS(ON) × I 2 Finally, calculate the junction temperature: TJ = PD x RθJA + TA Where: TA= Ambient temperature °C RθJA = Thermal resistance PD = Total power dissipation Ordering Information A P 2337 SA - 7 Package SA : SOT23 Device AP2337SA-7 Notes: Packing 7 : Tape & Reel 7” Tape and Reel Part Number Suffix -7 Package Code SA Packaging (Note 7) SOT23 Quantity 3000/Tape & Reel 7. 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. AP2337 Document number: DS35060 Rev. 2 - 2 8 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH Marking Information ( Top View ) 3 XX Y W X 1 Device AP2337SA-7 N EW PRODUCT 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 : Internal code Package SOT23 Identification Code KM Package Outline Dimensions SOT23 A BC H K D J F G L M K1 SOT23 Dim Min Max Typ A 0.37 0.51 0.40 B 1.20 1.40 1.30 C 2.30 2.50 2.40 D 0.89 1.03 0.915 F 0.45 0.60 0.535 G 1.78 2.05 1.83 H 2.80 3.00 2.90 J 0.013 0.10 0.05 K 0.903 1.10 1.00 K1 0.400 L 0.45 0.61 0.55 M 0.085 0.18 0.11 0° 8° α All Dimensions in mm AP2337 Document number: DS35060 Rev. 2 - 2 9 of 10 www.diodes.com September 2011 © Diodes Incorporated AP2337 1.0A SINGLE CHANNEL CURRENT-LIMITED LOAD SWITCH IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, 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). 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