AH276 Complementary Output Hall Effect Latch Features General Description - On-chip Hall sensor with two different sensitivity and hysteresis settings for AH276 - 400mA (avg) output sink current - Built-in protecting diode only for chip reverse power connecting - -20°C to 85°C operating temperature - Low profile 4 pin SIP package AH276 are integrated Hall sensors with output drivers, mainly designed for electronic commutation of brush-less DC Fan. This IC internally includes the regulator, protecting diode, Hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (DO, DOB). While the magnetic flux density (B) is larger than operate point (Bop), DO will turn on (low), and meanwhile DOB will turn off (high). Each output is latched until B is lower than release point (Brp), and then DO、DOB transfer each state. For DC fan application, sometimes need to test power reverse connection condition. Internal diode only protects chip-side but not for coil-side. If necessary, add one external diode to block the reverse current from coil-side. Applications - Dual-coil Brush-less DC Motor Dual-coil Brush-less DC Fan Revolution Counting Speed Measurement Ordering Information AH276 X - X X X Wafer Body Package Lead K: K version Wafer Body Q: Q version Wafer Body P: SIP-4L L : Lead Free Packing Blank : Tube or Bulk Typical Application Circuit 276 1 2 coil1 3 coil2 4 Vcc Brush-less DC Fan This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev.1.0 Jul 21, 2005 1/6 AH276 Complementary Output Hall Effect Latch Block Diagram 1 VCC DO 2 REG. Hall Plate DOB Amp 3 GND 4 Pin Assignment Front View 276 1 : VCC 2 : DO 3 : DOB 1 2 3 4 :GND 4 Name P/I/O Pin # Vcc DO DOB GND P O O P 1 2 3 4 Description Power Supply Input Output Pin Output Pin Ground Anachip Corp. www.anachip.com.tw Rev.1.0 Jul 21, 2005 2/6 AH276 Complementary Output Hall Effect Latch Absolute Maximum Ratings ( at Ta=25°C ) Characteristics Supply voltage Reverse VCC Polarity Voltage Magnetic flux density Continuous Output “on” current Hold Peak (Start Up) Operating temperature range Storage temperature range Package Power Dissipation Maximum Junction Temp Symbol VCC VRCC B Ic Ta Ts PD Tj Values 20 -20 Unlimited 0.4 0.5 0.7 -20~+85 -65~+150 550 150 Unit V V A °C °C mW °C Electrical Characteristics (T=+25°C) Characteristic Low Supply Voltage Symbol Vce Supply Voltage Vcc Output Zener Breakdown Vz Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Falling Time Switch Time Differential Vce(sat) Icex Icc tr tf ∆t Conditions Vcc=3.5V, IL=100mA K version Q version K version Q version Vcc=14V, IL=400mA Vce=14V, Vcc=14V Vcc=20V, Output Open Vcc=14V, RL=820Ω, CL=20pF Vcc=14V, RL=820Ω, CL=20pF Vcc=14V, RL=820Ω, CL=20pF Min 3.5 2.5* - Typ 0.4 46 35 0.7 <0.1 16 3.0 0.3 3.0 Max 20 20 0.9 10 25 10 1.5 10 Units V V V V µA mA µs µs µs *The output of DO/DOB will be switched on/off after supply voltage reaching the 2.5V. Test Circuit 14V 276 DO RL1 RL2 CL1 CL2 DOB RL1=RL2=820 Ohm CL1=CL2=20 pF Anachip Corp. www.anachip.com.tw Rev.1.0 Jul 21, 2005 3/6 AH276 Complementary Output Hall Effect Latch Magnetic Characteristics (Ta=+25°C, VCC=12V) K version Characteristic Operate Point Release Point Hysteresis Q version Characteristic Operate Point Release Point Hysteresis Symbol Bop Brp Bhy Min. -110 - Typ. 110 Symbol Bop Brp Bhy Min. 5 -70 - Typ. - Vcc ( off-state ) Bhy Turn off Turn on 0 Bop ( off-state ) Bhy Turn on Vcc Turn oFF Vsat Vsat Brp Unit Gauss Gauss Gauss ( on-state ) ( on-state ) N Max. 70 -5 - DOB ( Output Voltage ) ( Output Voltage ) DO (1mT = 10 Gauss) Max. Unit 110 Gauss Gauss Gauss S Brp N ( Magnetic flux density B ) Bop 0 S ( Magnetic flux density B ) Performance Characteristics (SIP-4) 25 550 105 198 Ta (°C) Pd (mW) Ta (°C) Pd (mW) 50 440 110 176 60 396 115 154 70 352 120 132 80 308 125 110 85 286 130 88 90 264 135 66 95 242 140 44 100 220 150 0 P o w e r D is s ip a tio n C u rve P d (m W ) 600 500 400 300 200 100 0 0 25 50 75 85 100 125 150 T a (。 C ) Anachip Corp. www.anachip.com.tw Rev.1.0 Jul 21, 2005 4/6 AH276 Complementary Output Hall Effect Latch Operating Characteristics S Marking side ( Output Voltage ) DO N Vcc Vd High Bhy Low Vsat ( SIP4 ) Brp N 0 Bop S ( Magnetic flux density ) Marking Information ( Top View ) Part Number 276 X XX X X Wafer Lot ID: a~z ~ K: AH276K-PL Q: AH276Q-PL Nth week: 01~52 Year: "1" = 2001 "2" = 2002 Anachip Corp. www.anachip.com.tw Rev.1.0 Jul 21, 2005 5/6 AH276 Complementary Output Hall Effect Latch Package Information Active Area Depth Package Sensor Location Marking side 1.95mm + 0.1mm 1.75mm 1.1mm + 0.1mm 1.35mm 1 0.7mm 2 3 1 4 K version 2 3 4 Q version Package Dimension o 5 -7 o 14.25mm +/-1.25mm 1.55mm +/-0.1mm o o 3 -5 0.46mm +/-0.03mm 276 5.22mm +/-0.1mm 4.20mm +/-0.1mm o 0.38mm +/-0.03mm o 3.65mm +/-0.1mm 0.30mm +/-0.1mm 5 -7 o 3 -5 0.41mm +/-0.03mm 3.81mm +/-0.03mm 1.03mm +/-0.1 o 0.2mm Max. 1.42mm+/-0.1mm Anachip Corp. www.anachip.com.tw 1.27mm +/-0.03mm Rev.1.0 Jul 21, 2005 6/6