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AT1605
High-Side Power Switch IC Features
* Operating Voltage:1.8V to 5.5V * Built-in N-MOS, 100m(typ) RDS,ON * Quiescent Current: 60A(typ) * Shutdown Current <1A * 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
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.
Applications
* USB Power Measurement * Notebook computers * Battery-Charger Circuits * Hot Plug-in Power Supplies
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: service@aimtron.com.tw 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 Pin Description
Symbol Pin No. Descript
2
3
NC
VOUT GND
VOUT GND NC EN VIN
1 2 3 4 5
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=85C) Package Thermal Resistance( JA ) Operating temperature TA Junction temperature Tj Storage temperature ESD Susceptibility(HBM) ESD Susceptibility(MM) Condition -- EN -- -- SOT25 -- -- Rated Value Min. Max. -0.3 +6 -0.3 +6 2 0.39 -40 -55 165 +85 150 +150 3 200 Unit V V A W C /W 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: service@aimtron.com.tw 2
AT1605
High-Side Power Switch IC Electrical Characteristics
(VIN =5V, Cin=1F, Cout=1F, RL=10 Ta =+25 , unless otherwise noted. )
Parameter Input Supply Range Quiescent Current Shutdown Current Switch On-Resistance Output Turn-on Rising Time Current Limit Threshold Short Circuit Current Forward Leakage Current VIN Under Voltage Lockout VIN Under Voltage Hysteresis EN Input Voltage Threshold EN Input Voltage Hysteresis Thermal Limit Thermal Limit Hysteresis
Symbol VIN IQ ISHDN RSW TRT ILIMT ISC ILeakage UVLO VHS VEN VENHS TL THS
Condition Min. 1.8 IOUT=0A, EN=High EN=Low IOUT=0.5A -
Values Typ. -60 100 450 Max. 5.5 1 130
Unit V A A m S 2.1 1 1.7 150 2.1 500 A A A V mV V mV C C
AT1605B, RLOAD=1 AT1605B, RLOAD=0 EN=Low, Vout=0V
1.1 1.2 50 1.9 300 -
1.5 1 1.4 100 2 400 130 20
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 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: service@aimtron.com.tw 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 1A; 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=130C, a thermal sensor activates the thermal protection, which shuts down the IC, allowing the IC to cool. Once the device cools down by 20C, IC will automatically recover normal operation. For continuous operation, do not exceed the absolute maximum junction-temperature rating of Tj=150C.
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 5
AT1605
High-Side Power Switch IC Typical characteristics:
AT1605BH VIN=5V Cin=1F Cout=1F TA=25C Turn on Delay Time and Rise Time Turn off Delay Time and Fall Time
Vout
2V/div
EN
RL=5 CL=100F
2V/div 500s/div Turn on and Output Current Thermal Shutdown Response
EN
2V/div
Iout
RL=5 CL=220F
0.5A/div 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: service@aimtron.com.tw 6
AT1605
High-Side Power Switch IC
Short Circuit Protection
Rising Rising Falling 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 7
AT1605
High-Side Power Switch IC
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 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: service@aimtron.com.tw 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 3C/second max.
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 5C of actual Peak Temperature (tP) Ramp-down Rate Time 25C to Peak Temperature
Pb-Free Assembly Large Body Small Body Pkg. thickness Pkg. thickness 2.5mm or Pkg. 2.5mm or Pkg. volume 350mm3 volume 350mm3 3C/second max.
100C 150C 60-120 seconds
150C 200C 60-180 seconds 3C/second max.
183C 60-150 seconds 225+0/-5C 10-30 seconds 240+0/-5C 10-30 seconds
217C 60-150 seconds 245+0/-5C 10-30 seconds 250+0/-5C 20-40 seconds
6C/second max. 6 minutes max.
3C/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: service@aimtron.com.tw 10

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