AT1605 High-Side Power Switch IC Features General Description • Operating Voltage:1.8V to 5.5V • Built-in N-MOS, 100mΩ(typ) RDS,ON • Quiescent Current: 60µA(typ) • Shutdown Current <1µA • Built-in Current Limit • Built-in Soft-Start. • Built-in Under Voltage Lock Function • Built-in Thermal Protection • TTL Control Input • SOT-23-5 Package The AT1605 is a smart high-side power switch to be able to supply up 2.0A from input source. The device features preventable reverse current flow from OUT to Input by free of parasitic body diode, when output voltage exceeds the input voltage, the N-MOS is turned off. The AT1605 includes built-in low on-resistance of NMOS to saved conductive loss, charge pump circuitry to drive N-MOS, built-in current limit, soft-start, thermal protection and under voltage lock function. Operating voltage range between 1.8V and 5.5V supports one Li-lon or adaptor source. Applications • USB Power Measurement • Notebook computers • Battery-Charger Circuits • Hot Plug-in Power Supplies The device is ideal for notebook computer, self-powered and bus powered USB application. The low quiescent current is conducive to saved power consumption. The AT1605 is available in 5-pin SOT-23-5 packages. Block Diagram EN VIN + BandGap Reference Current Limit N- MOS Clock Control Logic VOUT Charge pump UVLO Thermal Protection GND Aimtron reserves the right without notice to change this circuitry and specifications. 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 1 AT1605 High-Side Power Switch IC Ordering Information Part number AT1605B■X_GRE Package SOT-23-5 Marking B■05: Date Code with one button line Current Limit 1.5A ■ : Enable Control H: High Active L: Low Active Pin Configuration SOT-23-5 TOP-VIEW EN VIN 5 4 B 05 1 3 2 VOUT GND NC Pin Description Symbol Pin No. VOUT GND NC EN VIN 1 2 3 4 5 Descript Output Voltage Power Ground Not Connection Enable Control Input Power Supply Absolute Maximum Ratings Parameter Power Supply Voltage Input Pin Voltage Output Current Limit Continuous Power dissipation(TA=85°C) Package Thermal Resistance( θJA ) Operating temperature TA Junction temperature Tj Storage temperature ESD Susceptibility(HBM) ESD Susceptibility(MM) Condition — EN — — Rated Value Min. Max. -0.3 +6 -0.3 +6 2 0.39 Unit V V A W SOT25 - 165 C °/W — -40 -55 - +85 150 +150 3 200 °C °C °C KV V — Note1: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 2 AT1605 High-Side Power Switch IC Electrical Characteristics (VIN =5V, Cin=1µF, Cout=1µF, RL=10Ω Ta =+25℃ , unless otherwise noted. ) Parameter Symbol Condition Values Unit Min. Typ. Max. 1.8 -- 5.5 V IOUT=0A, EN=High - 60 - µA Input Supply Range VIN Quiescent Current IQ Shutdown Current ISHDN EN=Low - - 1 µA Switch On-Resistance RSW IOUT=0.5A - 100 130 mΩ Output Turn-on Rising Time TRT Current Limit Threshold ILIMT AT1605B, RLOAD=1Ω 1.1 1.5 2.1 A ISC AT1605B, RLOAD=0Ω - 1 - A EN=Low, Vout=0V - - 1 µA Short Circuit Current µS 450 Forward Leakage Current ILeakage VIN Under Voltage Lockout UVLO 1.2 1.4 1.7 V VIN Under Voltage Hysteresis VHS 50 100 150 mV EN Input Voltage Threshold VEN 1.9 2 2.1 V EN Input Voltage Hysteresis VENHS 300 400 500 mV Thermal Limit TL - 130 - °C Thermal Limit Hysteresis THS - 20 - °C 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 3 AT1605 High-Side Power Switch IC Typical Application Circuit Test Circuit 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 4 AT1605 High-Side Power Switch IC Function Description Enable Control Digital logic of EN provides an electrical ON/OFF control of the power supply. Connecting this pin to ground or to any voltage less than EN input threshold will completely turn OFF the Bias. In this state, current drain from the input supply is less than 1µA; the internal reference, comparators, and biasing circuitry turn off. EN works as a simple on/off control. Drive EN high to enable the device, or drive EN low for shutdown. Charge Pump The higher of supply battery powers the internal charge pump. The charge pump provides power to the current limit amplifier and allows the N-MOS gate voltage to be higher the battery supply voltage. A gate voltage that is higher than the source voltage is necessary to turn on the N-MOS. Under-Voltage Lockout (UVLO) The under voltage lockout prevents the device from misoperation at low input voltage. Soft-Start Soft-start is built-in on chip. When power up, the soft-start function is immediately active to nominal voltage by a constant current. During this time, the soft-start voltage directly controls the N-MOS on-time to reduce input surge currents. The maximum load current is available after the soft-start cycle is completed. Over-Current Limit The AT1605 provides cycle-by-cycle over-current protection. Current limit is accomplished using a separate dedicated comparator. The current limit signals control logic block to limit current of N-MOS in event that the current of flowing N-MOS is greater than the current limit value. The current-limit feature protection against a hard short or over-current fault at the output. Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the AT1605. When the junction temperature exceeds Tj=130°C, a thermal sensor activates the thermal protection, which shuts down the IC, allowing the IC to cool. Once the device cools down by 20°C, IC will automatically recover normal operation. For continuous operation, do not exceed the absolute maximum junction-temperature rating of Tj=150°C. 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 5 AT1605 High-Side Power Switch IC Typical characteristics: AT1605BH VIN=5V Cin=1µF Cout=1µF TA=25°C Turn on Delay Time and Rise Time Turn off Delay Time and Fall Time 2V/div Vout EN 2V/div RL=5Ω CL=100µF 500µs/div Turn on and Output Current Thermal Shutdown Response 2V/div EN Iout 0.5A/div RL=5Ω CL=220µF 1ms/div UVLO Protection at Rising UVLO Protection at Falling 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 6 AT1605 High-Side Power Switch IC Short Circuit Protection Shutdown time(ms) Short circuit Shutdown time vs. Temperature 500 450 400 350 300 250 200 150 100 50 0 -20 Quiescent Current vs. Input Voltage Quiescent Current(uA) Quiescent Current(uA) 60 50 40 30 20 10 0 2 2.5 3 3.5 4 Input Voltage(V) 4.5 5 -20 5.5 ON-Resistance(Ωm) ON-Resistance(Ωm) 2.5 3 3.5 4 Input Voltage(V) 4.5 5 5.5 -20 EN Voltage Threshold(V) EN Voltage Threshold(V) Falling 2 2.5 3 3.5 4 Input Voltage(V) 20 40 Temperature(°C) 60 85 4.5 0 20 40 Temperature(°C) 60 85 EN Voltage Threshold vs. Temperature Rising 1.8 0 120 115 110 105 100 95 90 85 80 75 70 65 60 EN Voltage Threshold vs. Input Voltage 2.9 2.6 2.3 2 1.7 1.4 1.1 0.8 0.5 85 ON-Resistance vs. Temperature 120 115 110 105 100 95 90 85 80 75 70 2 60 70 67 64 61 58 55 52 49 46 43 40 ON-Resistance vs. Input Voltage 1.8 20 40 Temperature(°C) Quiescent Current vs. Temperature 70 1.8 0 5 5.5 2.9 2.7 2.5 2.3 2.1 1.9 1.7 1.5 1.3 1.1 0.9 0.7 0.5 Rising Falling -20 0 20 40 60 85 Temperature(°C) 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 7 AT1605 High-Side Power Switch IC UVLO vs. Temperature Short Circuit Current Limit vs. Input Voltage 0.9 1.7 1.5 Short Circuit Current (A) UVLO(V) 1.9 Rising 1.3 Falling 1.1 0.9 0.7 0.5 -20 0 20 40 60 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 85 1.8 Temperature(°C) 1.8 2 2.5 3 3.5 4 Input Voltage(V) 2.5 3 3.5 4 Input Voltage(V) 4.5 5 5.5 Shutdown Current vs. Temperature 2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 Shutdown Current(uA) Current Limit (A) Current Limit vs. Input Voltage 2 4.5 5 5.5 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -20 0 20 40 Temperature(°C) 60 85 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 8 AT1605 High-Side Power Switch IC Package Outline: SOT-23-5 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 9 AT1605 High-Side Power Switch IC Reflow Profiles Profile Feature Sn-Pb Eutectic Assembly Large Body Small Body Pkg. thickness Pkg. thickness <2.5mm or Pkg. ≥2.5mm or Pkg. 3 volume ≥350mm3 volume <350mm Average ramp-up rate (TL to TP) Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) Tsmax to TL -Ramp-up Rate Time maintained above: -Temperature (TL) -Time (tL) Peak Temperature(TP) Time within 5°C of actual Peak Temperature (tP) Ramp-down Rate Time 25°C to Peak Temperature 3°C/second max. Pb-Free Assembly Large Body Small Body Pkg. thickness Pkg. thickness ≥2.5mm or Pkg. ≥2.5mm or Pkg. volume ≥350mm3 volume ≥350mm3 3°C/second max. 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds 3°C/second max. 183°C 60-150 seconds 217°C 60-150 seconds 225+0/-5°C 10-30 seconds 240+0/-5°C 10-30 seconds 6°C/second max. 6 minutes max. 245+0/-5°C 10-30 seconds 250+0/-5°C 20-40 seconds 3°C/second max. 8 minutes max. *All temperatures refer to topside of the package, measured on the package body surface. 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 4/26/2006 REV:1.1 Email: [email protected] 10