TD9516A

Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 General Description Features The TD9516/TD9517/TD9518/TD9519 series of power switches are designed for USB applications. The        62mΩ N-channel MOSFET power switch satisfies the voltage drop requirements of USB specification. The protection features include current-limit protection, short-circuit protection, and over-temperature protection.The device limits the output current at current limit threshold level. When VOUT drops below 1.5V, the devices limit the current to a lower and safe level. The over-temperature protection limits the junction temperature below 140oC in case of short circuit or over load conditions.Other features include a deglitched OCB output to indicate the fault condition and an enable input to enable or disable the device. 62mΩ High Side MOSFET Wide Supply Voltage Range: 2.7V to 5.5V Current-Limit and Short-Circuit Protections Over-Temperature Protection Fault Indication Output Enable Input Lead Free and Green Devices Available Applications    Notebook and Desktop Computers USB Ports High-Side Power Protection Switches Pin Configurations SOT-23-5(Top View) SOT-23-5(Top View) TD9516A/TD9517A TD9518A/TD9519A SOT-23-5(Top View) SOT-23-5(Top View) TD9516B/TD9517B TD9518B/TD9519B Figure October, 20, 2011. Pin Configuration of TD9516/TD9517/TD9518/TD9519(Top View) Techcode Semiconductor Limited 1 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Pin Description Pin Number TD9516/ TD9517 TD9518/ TD9519 Pin Name Description 1 5 VOUT Output Voltage Pin. The output voltage follows the input voltage. When ENB is high or EN is low, the output voltage is discharged by an internal resistor. 2 2 GND Ground. 3 1 OCB Fault Indication Pin. This pin goes low when a current limit or an over-temperature condition is detected after a 12ms deglitch time. EN Enable Input. Pulling this pin to high will enable the device and pulling this pin to low will disable device. The EN pin cannot be left floating. ENB Enable Input. Pulling this pin to high will enable the device and pulling this pin to low will disable device. The EN pin cannot be left floating. VIN Power Supply Input. Connect this pin to external DC supply. 4 3 5 4 Ordering Information TD951X □ □ □ Circuit Type A/B: A- Enable High B- Enable Low Packing: Blank：Tube R:Type and Reel T:SOT-23 October, 20, 2011. Techcode Semiconductor Limited 2 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Functional Block Diagram Absolute Maximum Ratings Symbol Parameter VIN VIN Input Voltage (VIN to GND) VOUT VOUT to GND Voltage VENB, VEN EN, ENB to GND Voltage VOCB OCB to GND Voltage TJ TSTG TSDR Maximum Junction Temperature Storage Temperature Maximum Soldering Temperature, 10 Seconds Rating -0.3 ~ 7 -0.3 ~ 7 -0.3 ~ 7 -0.3 ~ 7 150 -65 ~ 150 260 Unit V V V V o C o C o C Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. October, 20, 2011. Techcode Semiconductor Limited 3 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Recommended Operating Conditions Symbol Parameter VIN VIN Input Voltage VCC VCC Supply Voltage IOUT Range 2.7~5.5 4.5 ~ 5.5 0~1 0~ 2.4 -40 ~ 85 -40 ~ 125 OUT Output Current (TD9516/TD9518) OUT Output Current (TD9517/TD9519) TA TJ Ambient Temperature Junction Temperature Unit V V A A o C o C Note: Refer to the typical application circuit. Thermal Characteristics Symbol θJA Parameter Junction-to-Ambient Resistance in Free Air October, 20, 2011. Techcode Semiconductor Limited 4 Typical Value 235 Unit °C/W www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Electrical Characteristics Unless otherwise specified, these specifications apply over VIN=5V, VEN =5V or VENB=0V and TA= -40 ~ 85 oC. Typical values are at TA=25oC. Symbol Parameter Test Conditions Unit Min. Typ. Max. SUPPLY CURRENT VIN Supply Current No load, VEN=0V or VENB=5V - No load, VEN=5V or VENB=0V Leakage Current VOUT=GND, VEN=0V or VENB=5V Reverse Leakage Current VIN=GND, VOUT=5V, VEN=0V or VENB=5V - - 1 µA 60 100 µA - 1 µA 1 µA 62 78 mΩ 2.65 V POWER SWITCH RDS(ON) Power Switch On Resistance IOUT=1A, TA= 25 oC UNDER-VOLTAGE LOCKOUT (UVLO) VIN UVLO Threshold Voltage VIN rising, TA= -40 ~ 85 oC 1.7 VIN UVLO Hysteresis 0.2 V CURRENT-LIMIT AND SHORT-CIRCUIT PROTECTIONS ILIM ISHORT Current Limit Threshold TD9517/TD9519 VIN=2.7V to 5.5V, TA= -40 ~ 85 oC 2.5 2.8 3.2 A TD9516/TD9518 VIN=2.7V to 5.5V, TA= -40 ~ 85 oC 1.1 1.4 1.8 A TD9517/TD9519, VIN=2.7V to 5.5V 1.5 A TD9516/TD9518, VIN=2.7V to 5.5V 0.8 A OCB Output Low Voltage IOCB=5mA 0.2 OCB Leakage Current VOCB=5V OCB Deglitch Time OCB assertion, TA= -40 ~ 85 oC 5 2 Short-Circuit Output Current OCB OUTPUT PIN tD(OCB) 0.4 V 1 12 20 uA mS EN OR ENB INPUT PIN VIH Input Logic HIGH VIN=2.7V to 5V VIL Input Logic LOW VIN=2.7V to 5V V Input Current VOUT Discharge Resistance VEN=0V or VENB=5V, VOUT=1V 0.8 V 1 uA 40 Ω tD(ON) Turn On Delay Time 30 uS tD(OFF) Turn Off Delay Time 30 uS tSS Soft-Start Time No load, COUT=1µF, VIN=5V 400 uS TJ rising 140 °C 20 °C OVER-TEMPERATURE PROTECTION (OTP) TOTP Over-Temperature Threshold Over-Temperature Hysteresis October, 20, 2011. Techcode Semiconductor Limited 5 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Typical Operating Characteristics October, 20, 2011. Techcode Semiconductor Limited 6 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Typical Operating Characteristics(Cont.) October, 20, 2011. Techcode Semiconductor Limited 7 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Typical Operating Characteristics(Cont.) October, 20, 2011. Techcode Semiconductor Limited 8 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Typical Operating Characteristics(Cont.) October, 20, 2011. Techcode Semiconductor Limited 9 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Typical Operating Characteristics(Cont.) October, 20, 2011. Techcode Semiconductor Limited 10 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Operating Waveforms VIN =5V, RLOAD =30Ω, CIN =33µF/Electrolytic, VIN =5V, RLOAD =30Ω, CIN =33µF/Electrolytic, COUT =1µF/Electrolytic COUT =1µF/Electrolytic CH1: VENB, 5V/Div, DC CH1: VENB, 5V/Div, DC CH2: VOUT, 2V/Div, DC CH2: VOUT, 2V/Div, DC TIME: 200µs/Div TIME: 100µs/Div VIN =5V, RLOAD =30Ω, CIN =33µF/Electrolytic, VIN =5V, RLOAD =30Ω, CIN =33µF/Electrolytic, COUT =1µF/Electrolytic COUT =1µF/Electrolytic CH1: VIN, 1V/Div, DC CH1: VIN, 1V/Div, DC CH2: VOUT, 1V/Div, DC CH2: VOUT, 1V/Div, DC TIME: 2ms/Div TIME: 2ms/Div October, 20, 2011. Techcode Semiconductor Limited 11 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Operating Waveforms(Cont.) TD9516A, VIN =5V, OUT short to GND, TD9516A, VIN =5V, CIN =COUT=33µF/Electrolytic CIN =COUT=33µF/Electrolytic CH1: VOCB, 5V/Div, DC CH1: VEN, 5V/Div, DC CH2: VOUT, 2V/Div, DC CH2: VOCB, 5V/Div, DC CH3: IOUT, 1A/Div, DC CH3: IOUT, 1A/Div, DC TIME: 5ms/Div TIME: 5ms/Div TD9516A, VIN =5V, OUT Short to GND, TD9517A, VIN =5V, RLOAD =1kΩ to 2.2Ω, CIN =33µF/Electrolytic, No COUT CIN =COUT=33µF/Electrolytic CH1: VIN, 2V/Div, DC CH1: VOUT, 1V/Div, DC CH2: VOUT, 2V/Div, DC CH2: IOUT, 1A/Div, DC CH3: IOUT, 5A/Div, DC TIME: 1ms/Div TIME: 50µs/Div October, 20, 2011. Techcode Semiconductor Limited 12 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Type Application Circuit Function Description VIN Under-Voltage Lockout (UVLO) OCB Output The TD951X series of power switches have a built-in under-voltage lockout circuit to keep the output shutting off until internal circuitry is operating properly. The UVLO circuit has hysteresis and a de-glitch feature so that it will typically ignore undershoot transients on the input. When input voltage exceeds the UVLO threshold, the output voltage starts a soft-start to reduce the inrush current. TheTD951X series of power switches provide an open-drain Power Switch Pull the ENB above 2V or EN below 0.8V will disable the device, The power switch is an N-channel MOSFET with a low RDS(ON). The and pull ENB pin below 0.8V or EN above 2V will enable the internal power MOSFET does not have the body diode. When IC is device. When the IC is disabled, the supply current is reduced to off, the MOSFET prevents a current flowing from the VOUT back less than 1µA. The enable input is compatible with both TTL and to VIN and VIN to VOUT. CMOS logic levels. The EN/ENB pin cannot be left floating. Current-Limit Protection Over-Temperature Protection The TD951X series of power switches provide the current- limit When the junction temperature exceeds 140oC, the internal protection function. During current-limit, the devices limit output thermal sense circuit turns off the power FET and allows the current at current limit threshold. For reliable operation, the device device to cool down. When the device’s junction temperature cools should not be operated in current-limit for extended period. by 20oC, the internal thermal sense circuit will enable the device, Short-Circuit Protection resulting in a pulsed output during continuous thermal protection. When the output voltage drops below 1.5V, which is caused by an Thermal protection is designed to protect the IC in the event of over-load or a short-circuit, the devices limit the output current over temperature conditions. For normal operation, the junction down to a safe level. The short-circuit current limit is used to temperature cannot exceed TJ=+125oC. output to indicate that a fault has occurred. When any of current-limit or over-temperature protection occurs for a deglitch time of tD(OCB), the OCB goes low. Since the OCB pin is an open-drain output, connecting a resistor to a pull high voltage is necessary. Enable/Disable reduce the power dissipation during short-circuit conditions. If the junction temperature reaches over-temperature threshold, the device will enter the thermal shutdown. October, 20, 2011. Techcode Semiconductor Limited 13 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Application Information Input Capacitor A 1µF ceramic bypass capacitor from VIN to GND, located near the TD951X, is strongly recommended to suppress the ringing during short circuit fault event. Without the bypass capacitor, the output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Output Capacitor A low-ESR 10µF aluminum electrolytic or tantalum between VOUT and GND is strongly recommended to reduce the voltage drop during hot-attachment of downstream peripheral. (Per USB 2.0, output ports must have a minimum 120µF of low-ESR bulk capacitance per hub). Higher-value output capacitor is better when the output load is heavy. Additionally, bypassing the output with a 0.1µF ceramic capacitor improves the immunity of the device to short-circuit transients. October, 20, 2011. Layout Consideration The PCB layout should be carefully performed to maximize thermal dissipation and to minimize voltage drop, droop and EMI. The following guidelines must be considered: 1. Please place the input capacitors near the VIN pin as close as possible. 2. Output decoupling capacitors for load must be placed near the load as close as possible for decoupling highfrequency ripples. 3. Locate TD951X and output capacitors near the load to reduce parasitic resistance and inductance for excellent load transient performance. 4. The negative pins of the input and output capacitors and the GND pin must be connected to the ground plane of the load. 5. Keep VIN and VOUT traces as wide and short as possible. Techcode Semiconductor Limited 14 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Package Information TSOT23-5 Package Outline Dimensions October, 20, 2011. Techcode Semiconductor Limited 15 www.techcodesemi.com Techcode® DATASHEET USB Power-Distribution Switches TD9516/TD9517/TD9518/TD9519 Design Notes October, 20, 2011. Techcode Semiconductor Limited 16 www.techcodesemi.com