AT1605 AIMTRON | Alldatasheet

Document overview

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Technical content

Features

  • 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

Applications

  • USB Power Measurement
  • Notebook computers
  • Battery-Charger Circuits
  • Hot Plug-in Power Supplies General Description 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. 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 VIN Clock Control Logic EN N- MOS BandGap Reference UVLO Current Limit VOUT GND Thermal Protection Charge pump 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: service@aimtron.com.tw

Ordering Information

AT1605B■X_GRE SOT-23-5 B■05: Date Code with one button line 1.5A ■ : Enable Control H: High Active L: Low Active Pin Configuration VIN GND VOUT EN NC B 05 SOT-23-5 TOP-VIEW Pin Description Symbol Pin No. Descript VOUT Output Voltage GND Power Ground NC Not Connection EN Enable Control Input VIN Power Supply Absolute Maximum Ratings Rated Value Parameter Condition Min. Max. Unit Power Supply Voltage -0.3 V Input Pin Voltage EN -0.3 V Output Current Limit A Continuous Power dissipation(TA=85°C) 0.39 W Package Thermal Resistance( JA θ SOT25 165 C °/W Operating temperature TA -40 +85 Junction temperature Tj 150 Storage temperature -55 +150 ESD Susceptibility(HBM) KV ESD Susceptibility(MM) 200 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: service@aimtron.com.tw

Electrical Characteristics

(VIN =5V, Cin=1µF, Cout=1µF, RL=10Ω Ta =+25℃ , unless otherwise noted. ) Values Parameter Symbol Condition Min. Typ. Max. Unit Input Supply Range VIN 1.8 5.5 V Quiescent Current IQ IOUT=0A, EN=High µA Shutdown Current ISHDN EN=Low µA Switch On-Resistance RSW IOUT=0.5A 100 130 mΩ Output Turn-on Rising Time TRT 450 µS Current Limit Threshold ILIMT AT1605B, RLOAD=1Ω 1.1 1.5 2.1 A Short Circuit Current ISC AT1605B, RLOAD=0Ω A Forward Leakage Current ILeakage EN=Low, Vout=0V µA VIN Under Voltage Lockout UVLO 1.2 1.4 1.7 V VIN Under Voltage Hysteresis VHS 100 150 mV EN Input Voltage Threshold VEN 1.9 2.1 V EN Input Voltage Hysteresis VENHS 300 400 500 mV Thermal Limit TL 130 Thermal Limit Hysteresis THS

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: service@aimtron.com.tw 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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 EN Vout 500µs/div 2V/div RL=5Ω CL=100µF Turn on and Output Current Thermal Shutdown Response EN Iout 0.5A/div 2V/div 1ms/div RL=5Ω CL=220µF 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: service@aimtron.com.tw Short Circuit Protection Short circuit Shutdown time vs. Temperature 100 150 200 250 300 350 400 450 500 -20 Temperature(°C) Shutdown time(ms) Quiescent Current vs. Input Voltage 1.8 2.5 3.5 4.5 5.5 Input Voltage(V) Quiescent Current(uA) Quiescent Current vs. Temperature -20 Temperature(°C) Quiescent Current(uA) ON-Resistance vs. Input Voltage 100 105 110 115 120 1.8 2.5 3.5 4.5 5.5 Input Voltage(V) ON-Resistance(Ω m) ON-Resistance vs. Temperature 100 105 110 115 120 -20 Temperature(°C) ON-Resistance(Ω m) EN Voltage Threshold vs. Input Voltage 0.5 0.8 1.1 1.4 1.7 2.3 2.6 2.9 1.8 2.5 3.5 4.5 5.5 Input Voltage(V) EN Voltage Threshold(V) Rising Falling EN Voltage Threshold vs. Temperature 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 -20 Temperature(°C) EN Voltage Threshold(V) Rising 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: service@aimtron.com.tw UVLO vs. Temperature 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 -20 Temperature(°C) UVLO(V) Rising Falling Short Circuit Current Limit vs. Input Voltage 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 1.8 2.5 3.5 4.5 5.5 Input Voltage(V) Short Circuit Current (A) Current Limit vs. Input Voltage 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.8 2.5 3.5 4.5 5.5 Input Voltage(V) Current Limit (A) Shutdown Current vs. Temperature -0.8 -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 -20 Temperature(°C) Shutdown Current(uA)

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: service@aimtron.com.tw 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: service@aimtron.com.tw Reflow Profiles Sn-Pb Eutectic Assembly Pb-Free Assembly Profile Feature Large Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Small Body Pkg. thickness <2.5mm or Pkg. volume <350mm3 Large Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Small Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Average ramp-up rate (TL to TP) 3°C/second max. 3°C/second max. Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds Tsmax to TL -Ramp-up Rate 3°C/second max. Time maintained above: -Temperature (TL) -Time (tL) 183°C 60-150 seconds 217°C 60-150 seconds Peak Temperature(TP) 225+0/-5°C 240+0/-5°C 245+0/-5°C 250+0/-5°C Time within 5°C of actual Peak Temperature (tP) 10-30 seconds 10-30 seconds 10-30 seconds 20-40 seconds Ramp-down Rate 6°C/second max. 3°C/second max. Time 25°C to Peak Temperature 6 minutes max. 8 minutes max. *All temperatures refer to topside of the package, measured on the package body surface.