AIC1522 ADVANCE INFORMATION 3A POWER DISTRIBUTION SWITCH SPEC NO: DS-1522-P1 04/19/00 DESCRIPTION ! FEATURES The AIC1522 is an integrated high-side power switch for applications where heavy capacitive loads and short circuits are likely to be encountered. The high-side switch is a MOSFET with 60m RDS(ON). and ON/OFF is controlled by CTL pin. Gate driver is that provided by an internal charge pump designed to control the power switch rise times and fall times to minimize EMI and current surges during switching. * 60m (5V Input) High-Side MOSFET Switch. " 3A Continuous Load Current. " 80A Typical On-State Supply Current. " 1A Typical Off-State Supply Current. " Short Circuit Protection. " Thermal Shutdown Protection Under Overcurrent Condition. " Output Can Be Forced Higher Than Input (Off-State). " Adjustable Turn-on Rise Time. " Built-in 22 Discharge Resistor " Active-High or Active-Low Enable. These ICs also provide rise time adjustment function to meet different application. Add external capacitor from CR pin to GND to adjust the rise time . ! APPLICATIONS " " " Output current is typically limited to 3.5A.When the output load exceeds the current limit threshold or a short is present, the AIC1522 limits the current into a safe level by switching into a constant current mode and thermal shutdown function shuts the switch off to prevent damage under overcurrent conditions. Power Distribution Switch. Notebook Load Switch. Hot Plug-In Power Supplies. ! TYPICAL APPLICATION CIRCUIT IN CTL OUT CR GND Power Distribution Switch ! ORDERING INFORMATION AIC1522-XCX ORDER NUMBER PACKAGING TYPE S: SO8 W: SOT-89-5 AIC1522-0CS AIC1522-1CS (SO8) PIN CONFIGURATION FRONT VIEW GND 1 8 CR CTL 2 7 NC VIN 3 6 OUT VIN 4 5 OUT CONTROL POLARITY 0: Active Low 1: Active High AIC1522-0CW AIC1522-1CW (SOT-89-5) FRONT VIEW 5 1: VIN 2: GND 3: VOUT 4: CR 5: CTL 1 4 2 3 ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 1 AIC1522 3A POWER DISTRIBUTION SWITCH SPEC NO: DS-1522-P1 04/19/00 ! ABSOLUTE MAXIMUM RATINGS Supply Voltage (VIN) ........................................................................................... 7.0V Operating Temperature Range Storage Temperature Range Thermal Resistance (JA) ............................................................... -40C ~ 85C ............................................................... -65C ~ 150C SOT-89-5.........................................................150C SO8.................................................................190C ! ELECTRICAL CHARACTERISTICS (VIN= 5V, Ta=25C, unless otherwise specified.) PARAMETERS Supply Current Control Input Voltage CONDITIONS TYP. Switch Off, OUT=Open 0.75 Switch On, OUT=Open 80 VCTL =Logic "0" VCTL =Logic "1" Control Input Current MIN. MAX. UNIT A 0.8 V 2.4 VCTL =Logic "0" 0.01 1 VCTL =Logic "1" 0.01 1 Output MOSFET Resistance A 60 m Output Turn-On Rise Delay RL = 10 each Output 100 S Output Turn-On Rise Time CR = Open, RL = 10 500 S Output Leakage Current Current Limit Threshold 5 3.0 A A Thermal Limit 140 C Discharging Resistor 22 ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 2 AIC1522 3A POWER DISTRIBUTION SWITCH SPEC NO: DS-1522-P1 04/19/00 ! BLOCK DIAGRAM OSC. Thermal Protection Bandgap Reference IN CTL Charge Pump Current Limit Gate Control RS GATE NMOS Rd ON 60 h OUT CR DISCHARGE NMOS GND ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 3 AIC1522 3A POWER DISTRIBUTION SWITCH SPEC NO: DS-1522-P1 04/19/00 ! PIN DESCRIPTION PIN 1: IN - Power supply input. PIN 2: GND - Chip power ground. PIN 3: OUT - MOSFET switch output. PIN 4: CR - Rise time adjustment pin. Connect a capacitor from this pin to ground. PIN 5: CTL - TTL compatible control input. It controls the power switch turn-on / turn-off. Active High for AIC1522-1 and active low for AIC1522-0. ! APPLICATION INFORMATIONS Such implementations require the control of current surges seen by the main power supply being inserted. The most effective way to control these surges is to limit and slowly ramp the current and voltage while a power supply normally turns on. The AIC1522 can be used to provide a soft - start protection while AIC1522 being hot - plugged into a powered system. " Current Limit " The current limit threshold is preset internally. It protects the output MOSFET switches from damage due to undesirable short circuit conditions or excess inrush current often encountered during hot plug-in. The AIC1522 allows 3A continuous load current per Channel. " Thermal Protection When the chip temperature exceeds 140C, the thermal protection function works. " Supply Filtering A 0.1uF to 1uF bypass capacitor from IN to GND, located near the device, is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. " Short Circuit Transient Bulk capacitance provides the short-term transient current needed during a hot-attachment event. With a 33uF, 16V tantalum or 100uF, 10V electrolytic capacitor mounted close to downstream connector should provide transient drop protection. " Printed Circuit Layout The power circuitry of printed circuit boards requires a customized layout to maximize thermal dissipation and to minimize voltage drop and EMI. " Generic Hot - Plug Application Requirements In many applications it may be necessary to remove modules or PC boards while the main unit is still operating. These are considered hot - plug applications. ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 4 AIC1522 3A POWER DISTRIBTION SWITCH SPEC NO: DS-1522-P1 04/19/00 PHYSICAL DIMENSIONS " 8 LEAD PLASTIC SO (unit: mm) D SYMBOL MIN MAX A 1.35 1.75 A1 0.10 0.25 B 0.33 0.51 C 0.19 0.25 D 4.80 5.00 E 3.80 4.00 H E e e A A1 C B 1.27(TYP) H 5.80 6.20 L 0.40 1.27 L " SOT-89-5 (unit: mm) D A b1 C b HE E LE b e1 e SYMBOL MIN MAX A 1.40 1.60 b 0.32 0.52 b1 1.40 1.80 C 0.30 0.50 D 4.40 4.60 E 2.40 2.60 e 300 (TYP) e1 1.50 (TYP) HE 4.20 5.00 LE 0.80 --- ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 5