AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Description Pin Assignments The AH5794 is a single chip solution for driving single-coil (Top View) brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to FG 1 6 NC minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution. V 2 5 V SS DD Low operating voltage down to 1.8V allows motor speed to be O2 3 4 O1 controlled by varying the supply voltage. T TSOT26 C To help protect the motor coil, the AH5794 provides Rotor U Lock Protection which shuts down the output drive if rotor lock D (Top View) O is detected. The device automatically re-starts when the rotor R lock is removed. Over temperature shutdown provides NC 1 6 FG P thermal protection for the device. W V 2 5 O2 DD E A Tachometer output is provided by open-drain Frequency O1 3 4 V N SS Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic U-DFN2020C-6 change frequency. 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 1 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Typical Application Circuit T C U D O R P W E N Pin Descriptions Pin Name Description VDD Power supply pin V Ground pin SS O1 Output driving & sinking pin O2 Output driving & sinking pin NC No connection FG Frequency generator (Note 1) Notes: 1. The FG output is the same as the magnetic change frequency. AH5794 2 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Functional Block Diagram (Note 2) T C U D O R P W E N 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 3 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Absolute Maximum Ratings (T = 25°C, unless otherwise noted, Note 3) A Symbol Characteristics Values Unit VDD Supply Voltage 7 V IO(PEAK) Maximum Output Current (Peak) 1000 mA TSOT26 650 PD Power Dissipation mW U-DFN2020C-6 750 (Note 4) T TST Storage Temperature Range -65 ~ +150 oC C U ESD HBM Human Body Model ESD Protection 4 kV D Notes: 3. Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; O functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability R 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. P 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. W E N Recommended Operating Conditions (TA = 25°C) Symbol Parameter Conditions Min Max Unit VDD Supply Voltage at VDD pin DC supply speed control mode 1.8 6.0 V TA Operating Ambient Temperature Range Operating -40 +105 oC Electrical Characteristics (T = 25°C, V = 5V) A DD Symbol Characteristics Conditions Min Typ. Max Unit IDD Supply Current No Load - 2.2 - mA IOUT = 300mA 4.70 4.88 - V VOH Output Voltage High IOUT = 500mA 4.5 4.8 - V IOUT = 300mA - 0.12 0.3 V VOL Output Voltage Low IOUT = 500mA - 0.2 0.5 V Output voltage of N- and PMOS IOUT = 300mA 0.3 0.5 V V +V OH OL combined IOUT = 500mA 0.5 V TSW Output Switching Slope Duration 17Ω load on O1/O2 - 200 - μs ILEAK FG Output Leakage Current - - 5 μA VFGOL FG Output Voltage Low IFG = 5mA - - 0.4 V TON On Time 350 500 650 ms RDR Duty Ratio TOFF / TON - 10 - IC junction temperature thermal T _ 175 oC J SDN_TH shutdown threshold IC junction temperature thermal TJ_SDN_HYST 25 oC shutdown hysteresis AH5794 4 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Magnetic Characteristics (T = 25°C, V = 1.8V to 6V, Note 5) A DD (1mT = 10 G) Symbol Parameter Min Typ. Max Unit BOP Operate Point 10 25 50 BRP Release Point -50 -25 -10 Gauss Bhy Hysteresis - 50 - Notes: 5. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering. T C U D O Operating Characteristics R P O1 O2 W VOH VOH E s s N olt RP OFF olt OFF OP V V n n e i e i g g a a olt olt V V ut ut p p Out ON OP Out RP ON V V OL OL Brp 0 Bop Brp 0 Bop Magnetic Flux Density in Gauss Magnetic Flux Density in Gauss S N Marking side Marking side N S (U-DFN2020C-6) (TSOT26) AH5794 5 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Operating Characteristics (Note 6, 7, 8 and 9) S Magentic N O2 T O1 C U D O Ton Toff R FG P Normal spinning Mechanical lock “Re-start spinning” W E N motor locked detected motor locked cleared Truth Table O1 O2 FG L H L H L H X L L (Note 9) Notes: 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 6 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Application Note Motor Speed Control DC Supply Voltage (V ) Speed Control DD Motor speed can be controlled by varying the V supply voltage between 1.8V to 6V. DD With 5V nominal motor, changing V voltage between 5V to 1.8V, speed can be controlled from 100% to 36% typically. DD T Soft Switching C AH5794 uses soft switching of the motor coil current during commutation for to minimize audible switching noise and U electromagnetic interference (EMI) to provide a low noise solution. D O R P Vdd W E Vout 1 N Vout 2 Vss 200µs typ. AH5794 7 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Thermal Performance Characteristics (1) Package type: TSOT26 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 T PD (mW) 234 208 182 156 130 104 78 52 26 0 C U 700 D O 650 R 600 P W) m W N ( 500 O NE ATI 400 P SI S DI 300 R E W 200 O P 100 0 105 -40 25 50 75 100 125 150 TEMPERATURE (°C) Power Dissipation Curve AH5794 8 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Thermal Performance Characteristics (cont.) (2) Package type: U-DFN2020C-6 (Note 10) T (°C) 25 50 60 70 75 80 85 90 95 100 A P (mW) 781 625 563 500 469 438 406 375 344 313 D T (°C) 105 110 115 120 125 130 135 140 145 150 A P (mW) 281 250 219 188 156 125 94 63 31 0 D T C U 900 D O 800 R W) 700 P m W ON ( 600 E PATI 500 N SI S 400 DI R E 300 W O P 200 100 0 105 -40 25 50 75 100 125 150 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 9 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Ordering Information AH5794 - XXX - 7 Package Packing WU : TSOT26 7 : Tape & Reel FDC : U-DFN2020C-6 T C U Package Packaging 7” Tape and Reel D Device Code (Note 11 & 12) Quantity Part Number Suffix O R AH5794-WU-7 WU TSOT26 3000/Tape & Reel -7 P AH5794-FDC-7 FDC U-DFN2020C-6 3000/Tape & Reel -7 W Notes: 11. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at E http://www.diodes.com/datasheets/ap02001.pdf N 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 : Identification Code XX Y : Year : 0~9 W : Week : A~Z : 1~26 week; Y W X 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 10 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Package Outline Dimensions (All Dimensions in mm) (1) Package type: TSOT26 T C U D O R P W E N (2) Package Type: U-DFN2020C-6 Hall Sensor 1 0. ± 0.57/0.63 1.0 0.55±0.1 Top Mark 0.43mon. 0.05 C (Active area depth) x. a 0.08 C 5m Seating plane 5 C 0.1 C 6x-0.37 Pin#1 ID 0/0.02x0.15 1.95/2.075 A 0.57/0.63 B 1.55/1.75 0.30±0.1 5 R0.15 6x-0.4 0.9 1.95/2.075 0.86/1.06R 0.1 0.30/0.40 Die 0.651.59 2x- 0.15 C Land Pattern Recommendation (Unit:mm) 0.65nom. 0.2/0.3 0.05M C A B Top View Bottom View AH5794 11 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Taping Orientation (1) Package Type: U-DFN2020C-6 T C U D O R P W E N 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 12 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © 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). 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. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. T C Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized U sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall D indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees O arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. R P Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. W E LIFE SUPPORT N Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2012, Diodes Incorporated www.diodes.com AH5794 13 of 13 March 2012 Document number: DS35809 Rev. 1 - 2 www.diodes.com © Diodes Incorporated

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