AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Description Pin Assignments The AH5794 is a single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution. (Top View) NEW PRODUCT Low operating voltage down to 1.8V allows motor speed to be controlled by varying the supply voltage. FG 1 6 NC VSS 2 5 VDD O2 3 4 O1 TSOT26 To help protect the motor coil, the AH5794 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device. (Top View) A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency. NC 1 6 FG VDD 2 5 O2 O1 3 4 VSS U-DFN2020C-6 The AH5794 is available in space saving and low profile TSOT26 and U-DFN2020C-6 packages. Features Applications • Supports single-coil full-wave BLDC fan drivers • 3V/ 3.3V/ 5V BLDC Cooling Fans • Built-in Hall sensor and input amplifier • Netbook/ Notebook BLDC fans • Operating voltage: 1.8V to 6V • Instruments cooling fans • VDD voltage speed control • Low Voltage/ Low Power BLDC Motors • Soft switching for low noise DC fan motor applications • Rotor Lock Protection (Lock detection, output shutdown and automatic re-start) • Thermal protection • Tachometer (FG) output • No external timing capacitor - Reduces the numbers of external components required • Low profile package: TSOT26 and U-DFN2020C-6 • Halogen and Antimony free “Green” packages. • Lead Free Finish/ RoHS Compliant AH5794 Document number: DS35809 Rev. 1 - 2 1 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER NEW PRODUCT Typical Application Circuit Pin Descriptions Pin Name VDD Notes: Description Power supply pin VSS Ground pin O1 Output driving & sinking pin O2 Output driving & sinking pin NC No connection FG Frequency generator (Note 1) 1. The FG output is the same as the magnetic change frequency. AH5794 Document number: DS35809 Rev. 1 - 2 2 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER NEW PRODUCT Functional Block Diagram (Note 2) Notes: 2.The AH5794 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically a pull-up resistor of 10kΩ is recommended from FG pin to the supply voltage. AH5794 Document number: DS35809 Rev. 1 - 2 3 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Absolute Maximum Ratings (TA = 25°C, unless otherwise noted, Note 3) Symbol VDD IO(PEAK) NEW PRODUCT PD TST ESD HBM Notes: Characteristics Values Unit 7 V 1000 mA Supply Voltage Maximum Output Current (Peak) TSOT26 Power Dissipation 650 U-DFN2020C-6 750 (Note 4) Storage Temperature Range -65 ~ +150 Human Body Model ESD Protection 4 mW o C kV 3. Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time 4. U-DFN2020C-6 exposed pad soldered to minimum recommended landing pads (see Package Outline Dimension section) on a two-layer 2oz. copper FR4 PCB (1.6mm thickness) with no thermal vias in exposed PADs or any copper flood connecting to the landing pattern of the exposed pad. Recommended Operating Conditions (TA = 25°C) Symbol VDD TA Parameter Conditions Supply Voltage at VDD pin DC supply speed control mode Operating Ambient Temperature Range Operating Min Max 1.8 6.0 Unit V o C -40 +105 Min Typ. Max Unit - 2.2 - mA IOUT = 300mA 4.70 4.88 - V IOUT = 500mA 4.5 4.8 - V IOUT = 300mA - 0.12 0.3 V IOUT = 500mA - 0.2 0.5 V 0.5 V Electrical Characteristics (TA = 25°C, VDD = 5V) Symbol Characteristics IDD Supply Current VOH Output Voltage High VOL Output Voltage Low Conditions No Load VOH +VOL Output voltage of N- and PMOS combined IOUT = 300mA 0.3 IOUT = 500mA 0.5 TSW Output Switching Slope Duration 17Ω load on O1/O2 - IFG = 5mA 350 - ILEAK FG Output Leakage Current VFGOL FG Output Voltage Low TON On Time RDR Duty Ratio TOFF / TON V - μs - 5 μA - 0.4 V 500 650 ms 10 - 200 TJ_SDN_TH IC junction temperature thermal shutdown threshold 175 o C TJ_SDN_HYST IC junction temperature thermal shutdown hysteresis 25 o C AH5794 Document number: DS35809 Rev. 1 - 2 4 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Magnetic Characteristics (TA = 25°C, VDD = 1.8V to 6V, Note 5) (1mT = 10 G) Notes: Parameter Min Typ. Max BOP Operate Point 10 25 50 BRP Release Point -50 -25 -10 Bhy Hysteresis - 50 - Unit Gauss 5. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering. Operating Characteristics O1 O2 VOH VOH RP OFF ON OP Output Voltage in Volts Output Voltage in Volts NEW PRODUCT Symbol VOL Brp 0 OFF OP RP ON VOL Bop Brp Magnetic Flux Density in Gauss 0 N S Marking side Marking side N S (U-DFN2020C-6) (TSOT26) AH5794 Document number: DS35809 Rev. 1 - 2 Bop Magnetic Flux Density in Gauss 5 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Operating Characteristics (Note 6, 7, 8 and 9) Magentic S N NEW PRODUCT O2 O1 Ton FG Toff Mechanical lock Normal spinning motor locked detected “Re-start spinning” motor locked cleared Truth Table Notes: O1 O2 FG L H L H L H L L X (Note 9) 6. In “Normal spinning, the FG changes its state at each edge of O1. 7. When the motor locks with South pole at the Hall element, O2 is kept on “L” and O1 is a clock with Ton/Toff ratio. When motor locks with North pole at the Hall element, O1 is kept on “L”, O2 is a clock with Ton/Toff ratio. 8. When “Re-start spinning” occurs, the motor speed ramps up to the “Normal Spinning” speed from zero. Speed ramp-up profile depends on motor characteristics. 9. X: H or L depends on magnetic pole North or South AH5794 Document number: DS35809 Rev. 1 - 2 6 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Application Note Motor Speed Control DC Supply Voltage (VDD) Speed Control Motor speed can be controlled by varying the VDD supply voltage between 1.8V to 6V. NEW PRODUCT With 5V nominal motor, changing VDD voltage between 5V to 1.8V, speed can be controlled from 100% to 36% typically. Soft Switching AH5794 uses soft switching of the motor coil current during commutation for to minimize audible switching noise and electromagnetic interference (EMI) to provide a low noise solution. Vdd Vout 1 Vout 2 Vss 200µs typ. AH5794 Document number: DS35809 Rev. 1 - 2 7 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Thermal Performance Characteristics TA (°C) 25 50 60 70 75 80 85 90 95 100 PD (mW) 651 521 469 417 391 365 339 313 286 260 TA (°C) 105 110 115 120 125 130 135 140 145 150 PD (mW) 234 208 182 156 130 104 78 52 26 0 POWER DISSIPATION (mW) NEW PRODUCT (1) Package type: TSOT26 700 650 600 500 400 300 200 100 0 -40 25 50 75 100 105 125 150 TEMPERATURE (°C) Power Dissipation Curve AH5794 Document number: DS35809 Rev. 1 - 2 8 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Thermal Performance Characteristics (cont.) (2) Package type: U-DFN2020C-6 (Note 10) 25 50 60 70 75 80 85 90 95 100 PD (mW) 781 625 563 500 469 438 406 375 344 313 TA (°C) 105 110 115 120 125 130 135 140 145 150 PD (mW) 281 250 219 188 156 125 94 63 31 0 NEW PRODUCT TA (°C) 900 POWER DISSIPATION (mW) 800 700 600 500 400 300 200 100 0 -40 25 50 75 100 105 125 150 TEMPERATURE (°C) Power Dissipation Curve Notes: 10. U-DFN2020C-6 exposed pad soldered to minimum recommended landing pads (see Package Outline Dimension section) on a two-layer 2oz. copper FR4 PCB (1.6mm thickness) with no thermal vias in exposed PADs or any copper flood connecting to the landing pattern of the exposed pad. AH5794 Document number: DS35809 Rev. 1 - 2 9 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Ordering Information NEW PRODUCT AH5794 - XXX - 7 Package Packing WU : TSOT26 FDC : U-DFN2020C-6 7 : Tape & Reel 7” Tape and Reel Package Code Packaging (Note 11 & 12) Quantity Part Number Suffix AH5794-WU-7 WU TSOT26 3000/Tape & Reel -7 AH5794-FDC-7 FDC U-DFN2020C-6 3000/Tape & Reel -7 Device Notes: 11. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf 12. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. No purposely added lead. Halogen and Antimony free. Please visit our website at http://www.diodes.com/products/lead_free.html Marking Information (1) Package type: TSOT26 Part Number Package Identification Code AH5794-WU-7 TSOT26 J4 (2) Package type: U-DFN2020C-6 ( Top View ) XX YWX XX : Identification Code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Internal code Part Number Package Identification Code AH5794-FDC-7 U-DFN2020C-6 J4 AH5794 Document number: DS35809 Rev. 1 - 2 10 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Package Outline Dimensions (All Dimensions in mm) NEW PRODUCT (1) Package type: TSOT26 (2) Package Type: U-DFN2020C-6 0.15max. 0.15 C B 2x- A 6x-0.37 0.57/0.63 0.30±0.1 15 0.86/1.06 1.95/2.075 R0. 1.95/2.075 1.55/1.75 Seating plane C 0.30/0.40 Pin#1 ID 2x 0/0.05 0.08 C (Active area depth) Die 1 R0. 0.9 Top Mark 0.05 C 6x-0.45 0.55±0.1 0.43mon. 1.0±0.1 0.57/0.63 Hall Sensor 0.65 1.59 0.15 C 0.65nom. 0.2/0.3 0.05 M C A B Land Pattern Recommendation (Unit:mm) Top View Bottom View AH5794 Document number: DS35809 Rev. 1 - 2 11 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Taping Orientation NEW PRODUCT (1) Package Type: U-DFN2020C-6 Notes: 11. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf. AH5794 Document number: DS35809 Rev. 1 - 2 12 of 13 www.diodes.com March 2012 © Diodes Incorporated AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). NEW PRODUCT Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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