RT9726 RICHTEK | Alldatasheet

Document overview

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Technical content

Features

zzzzz Wide Input Voltage Range : 4.75V to 25V zzzzz 0.5μμμμμA Shutdown Current zzzzz 2 Selectable Hysteresis Threshold zzzzz Reference Output for Thermal Threshold Setting zzzzz Open-drain Logic Output zzzzz RoHS Compliant and Halogen Free

Applications

z Notebook Temperature Monitoring z Microprocessor Thermal Management z Temperature Control z Fan Control z Electronic System Protection EN REF VIN GND NTC OT High-Voltage Hysteresis Selectable Temperature Switch EN RT9726 VIN4.75V to 25V GND23 REF NTC 0.1µF Chip Enable 3.3V OT System SHDN# 570 Thermistor ß = 4250 10kSystem shutdown switch @ Temp = 100°C for default hysteresis 30°C 100k VIN A1=W A1= : Product Code W : Date code RT9726 Package Type U6 : SC-70-6 Lead Plating System G : Green (Halogen Free and Pb Free)

DS9726-01 April 2011www.richtek.com Function Block Diagram Pin No. Pin Name Pin Function 1 VIN High Voltage Power Supply Input. This pin should be bypassed with a 0.1μF capacitor to ground. 2 GND Ground pin. Tie the ground pin close to temperature sensing thermistor.

3 NTC

This pin should connect a thermistor resistor to ground. The NTC pin will sense the external thermistor cross voltage and provide typical 50%REF over-temperature threshold for OT pin. 4 OT Open-drain and active-low output. OT will go LOW when NTC pin is lower than typical 50%REF over-temperature threshold. 5 REF Reference Output. This pin should connect with a resistor to NTC pin to set the over- temperature threshold. 6 EN Chip Enable (Active High). This pin can be used for the over-temperature threshold hysteresis setting. Functional Pin Description REF Hysteresis Control EN REF VIN GND NTC OT

DS9726-01 April 2011 www.richtek.com

Electrical Characteristics

(No load on REF, VIN = 7V, VEN = 5V, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Input Supply VIN Shutdown Current I VIN V IN = 4.75V to 25V, EN = GND -- -- 3 μA VIN Quiescent Current I Q VIN = 4.75V to 25V, EN = 5V, No Load On REF -- 100 150 μA REF Output REF Output Voltage REF No External Load 1.978 2 2.022 V REF Output Current I REF In 1% REF Drop -- -- 2 mA Logic Output OT Output Low Voltage OT Sink Current = 4mA -- -- 0.2 V Temperature Threshold Configure Over-Temperature Threshold NTC/REF OT = High 47.5 50 52.5 % Mode = Hyst1, OT = Low 62.5 65 67.5 % Over-Temperature Recovery Threshold NTC/REF Mode = Hyst2, OT = Low 70 72.5 75 % Shutdown -- -- 0.4 V Set Hyst1 Mode 1.2 -- 2.4 V EN Input Voltage EN Set Hyst2 Mode 2.9 -- -- V Absolute Maximum Ratings (Note 1) z Power Dissipation, PD @ TA = 25°C z Package Thermal Resistance (Note 2) z ESD Susceptibility (Note 3) Recommended Operating Conditions (Note 4)

DS9726-01 April 2011www.richtek.com Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. θ JA is measured in the natural convection at T A = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions.

DS9726-01 April 2011 www.richtek.com Typical Operating Characteristics Over Temperature Recovery Threshold Time (1ms/Div) VEN (5V/Div) OT (5V/Div) VREF (5V/Div) VNTC (1V/Div) VEN = 3.3V, VIN = OT = 5V, CIN = 0.1μF Over Temperature Recovery Threshold Time (1ms/Div) VEN (2V/Div) OT (5V/Div) VREF (5V/Div) VNTC (1V/Div) VEN = 1.8V, VIN = OT = 5V, CIN = 0.1μF Start Up from EN Time (5ms/Div) VEN (5V/Div) OT (5V/Div) VREF (2V/Div) VNTC (1V/Div) VIN = OT = 5V, CIN = 0.1μF Shutdown Current vs. Input Voltage 0.40 0.45 0.50 0.55 0.60 5 7 9 11 13 15 17 19 21 23 25 Input Voltage (V) Shutdown Current (uA) VEN = 0V, No Load Quiescent Current vs. Input Voltage 100 101 102 103 104 105 5 7 9 1 11 31 51 71 92 12 32 5 Input Voltage (V) Quiescent Current (uA) VEN = 5V, No Load

DS9726-01 April 2011www.richtek.com Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the ri ght to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property inf ringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications i s assumed by Richtek. Richtek Technology Corporation Taipei Office (Marketing) 5F, No. 95, Minchiuan Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@richtek.com A e b B D C H L SC-70-6 Surface Mount Package Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.800 1.100 0.031 0.044 A1 0.000 0.100 0.000 0.004 B 1.150 1.350 0.045 0.054 b 0.150 0.400 0.006 0.016 C 1.800 2.450 0.071 0.096 D 1.800 2.250 0.071 0.089 e 0.650 0.026 H 0.080 0.260 0.003 0.010 L 0.210 0.460 0.008 0.018 Outline Dimension