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UNISONIC TECHNOLOGIES CO., LTD US2005
Preliminary CMOS IC
FIXED CURRENT LIMIT POWER DISTRIBUTION SWITCH
DESCRIPTION
UTC US2005 is a lo w voltage cost-effective high-side power switch with curr ent li miting fu nction. It is partic ularly s uitable for ge neral purpose p ower distributi on and co ntrol i n digita l telev isions (DT V), printers, set top boxes (STB), PCs, PDAs, and other peripheral devices. UTC US2005 contains a ch arge pump circuitry to dr ive the internal MOSFET switch and also incorporate such protection circuits: soft-start circuit protect these dev ices from being d amaged b y li miting inr ush current d uring plug- in; ther mal shutd own circuit is us ed to preve nt catastrophic s witch fai lure fr om hi gh-current loa ds. UVL O is used to ensure that the device rem ains off unl ess there is a vali d input volta ge present. A flag output is designed to indicate fault conditions to the local USB contro ller. Lo wer quiescent curre nt a s 80 μA making this devic e ideal for portable battery-operated equipment. UTC US2005 allo ws mom entary high c urrent surg es to pass unrestricted without sacrifici ng over all s ystem safet y. It also a llows output slew rate limiting by an external capacitor.
FEATURES
* Built-in 80mΩ N-MOSFET * Open-drain fault flag output to Indicate fault conditions * Input voltage varies from 2.5V to 5.5V * 80μA low quiescent current * Current limit values of 0.5A, 0.8A, and 1.2A * Automatic-on output after fault * Thermal protection * Under voltage lock-out (UVLO)
ORDERING INFORMATION
Package Packing SOT-26 Tape Reel
Ordering Number Lead Free Halogen Free US2005L-AG6-R US20 05G-AG6-R Note: xx : Output Voltage, refer to Marking Information.
MARKING INFORMATION
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QW-R502-A04.a
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US2005
Preliminary
CMOS IC
PIN CONFIGURATION
PIN DESCRIPTION
PIN NAME IN GND EN LG DESCRIPTION Supply input. This pin provi des po wer to both the outp ut switch and the UTC US2005’s internal control circuitry. Ground. Switch Enable (Input): Active-high (-1) or active-low (-2) Fault status. A logic LOW on this pin indicates the UTC US2005 is in current limiting, or has been shut down by the thermal protection circuit. This is an ‘Open Drain’ output allowing logical OR’ ing of multiple UTC US2005s. Slew r ate con trol. Adding a small value capacitor bet ween this pin a nd VIN slo ws turn-ON of the power FET. Switch output. The load being driven by UTC US2005 is connected to this pin.
PIN NO. 1 2 3 4F
5 CSLEW 6 OUT
BLOCK DIAGRAM
IN CSLEW Slew Rate Control UVLO Current Limiting
EN
Gate Control Bias Thermal Protection Output Voltage Detection
OUT
Oscillator
Charge Pump
Delay
FLG GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 5
QW-R502-A04.a
US2005
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified) (Note 1)
PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN 6 V Enable Input Voltage VEN 5.5 V Flag Voltage VFLG 5.5 V Power Dissipation (TA=25°C) P W D 0.4 Junction Temperature TJ 150 °C Storage Temperature TSTG -65~ 150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
SYMBOL θJA RATINGS 230 UNIT °C/W
PARAMETER Package Thermal Resistance
RECOMMENDED OPERATING CONDITIONS (Note 2)
SYMBOL VIN VI(EN) TA RATINGS 2.5~5.5 0~5.5 0~2.1 -40~+85 UNIT V V A °C
PARAMETER Supply Input Voltage Enable Input Voltage Continuous Output Current Range Ambient Operating Temperature
ELECTRICAL CHARACTERISTICS
TYP 1 80 12 MAX 5.5 5 300 100 100 125 0.9 1.5 2.1 6 25 2.4 0.5 5 0.4 UNIT V μA μA μA mΩ mΩ A A A A V V V V μA V °C
(VIN=5V, TAMBIENT=25°C unless specified otherwise. Bold indicates -40°C~+85°C limits.) PARAMETER SYMBOL TEST CONDITIONS MIN Switch Input Voltage VIN 2.5 Internal Supply Current IIN S witch=OFF, ENABLE=0V Internal Supply Current IIN S witch=ON, IOUT=0, ENABLE=1.5V Output Leakage Current ILEAK VIN=5V, VOUT=0V, ENABLE=0 70 Power Switch Resistance RDS(ON) VIN=5V, IOUT=100mA Current Limit: –0.5 Current Limit: –0.8 Current Limit: –1.2 Secondary Current Limit (Kickstart) Under Voltage Lock Out Threshold ENABLE Input Voltage ENABLE Input Current Fault Status Output Voltage Over-Temperature Threshold ILIMIT ILIMIT ILIMIT ILIMIT_2nd V UVLOTHRESHOLD VEN IEN VFAULT OTTHRESHOLD VOUT=0.8VIN to VOUT=1V 0.5 VOUT=0.8VIN to VOUT=1V 0.8 VOUT=0.8VIN to VOUT=1V 1.2
IN=2.7V
0.7 1.1 1.6 4 2.0 1.9 2.25 2.15
2.2
VIN Rising VIN Falling VIL(max.) VIH(min) 1.5 VEN=0V~5.0V IOL=10mA TJ Increasing TJ Decreasing
1 0.25 145 135
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-A04.a
US2005
AC CHARACTERISTICS
Preliminary
CMOS IC
PARAMETER SYMBOL TEST CONDITIONS Output Turn-ON Rise Time tRISE RL=10Ω, CLOAD=1µF, VOUT=10%~90% 500 Delay Before Asserti.