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Technical content

Features

  • Low-voltage drive — Dual power supply operation: VS = 1.6 to 7.5 V, VDD = 1.9 to 6.5 V — Single power supply operation: VS = V DD = 1.9 to 7.5 V
  • Low saturation voltage output: Vosat = 0.3 V at I O = 200 mA
  • Supports constant voltage and constant current drive
  • Built-in reference voltage circuit (Vref = 0.9 V)
  • Miniature, thin form package (Thickness t = 1.1 mm) Package Dimensions unit: mm 3246-TSSOP20 Parameter Symbol Conditions Ratings Unit Maximum supply voltage VBmax VS1, VS2, VDD –0.3 to +10.5 V Applied output voltage V OUT OUT1, 2, 3, 4 –0.3 to +10.5 V Maximum output current: OUT1, 2, 3, and 4 I Omax t  10 ms 400 mA Applied input voltage V IN ENA, IN, VC 10.5 V Allowable power dissipation Pdmax When mounted on a printed circuit board * 0.8 W Operating temperature Topr –20 to +85 °C Storage temperature Tstg –55 to +150 °C Specifications Absolute Maximum Ratings at Ta = 25°C Note: Circuit board: 114.3  76.1  1.6 mm3 glass epoxy board 0.65 (0.33) 0.22 0.5 0.15 (1.0)0.08 1.2max 6.4 4.4 6.5 1 10 20 11 TSSOP20 [LB1939T]

Parameter Symbol Conditions Ratings Unit min typ max Standby mode current drain I STB VS = VDD = 6.5 V 0.1 1.0 µA [Regulator Output Circuit] VREF output voltage VREF IOL = 0 to 1 mA 0.85 0.9 0.95 V SV DD output voltage VSV DD IOL = 10 mA 4.7 4.8 V [H Bridge Output Circuit] OUT pin output saturation voltage 1Vosat1 VDD = 5.0 V, VC = SVDD , VS = 2.0 V 0.20 0.30 V(Saturation control mode) IO = 200 mA (PNP transistor side) OUT pin output saturation voltage 2Vosat2 VDD = 5.0 V, VC = SVDD , VS = 2.0 V 0.10 0.15 V(Saturation control mode) IO = 200 mA (NPN transistor side) OUT pin output current 1 IOUT 1 VDD = 6.0 V, VC = 0.9 V, VS = 3.5 V 197 210 223 mA(Constant current control mode) RL = 5 Ω (between OUT and OUT), RFB = 1 Ω OUT pin output current 2 IOUT 2 VDD = 6.0 V, VC = VREF , VS = 2.0 V 189 210 231 mA(Constant current control mode) RL = 5 Ω (between OUT and OUT), RFB = 1 Ω VS system operating current drain 1IS1 VC = SV DD 4 7 mA VS system operating current drain 2IS2 VC = VREF 1.5 3 mA VDD system operating current drain 1IDD 1 VC = SVDD ENA1 = 2 V 4 7 mA VDD system operating current drain 2IDD 2 VC = VREF ENA1 = 2 V 4 7 mA VC input voltage range VC 0.1 7 V VC input current IVC V DD = 6.0 V, VS = 2.0 V, VC = 5.0 V 0 50 100 µA [Control Input Circuit] Control pin maximum input current IIH VIH = 5.5 V 70 100 µA IIL VIL= GND –1 0 µA Electrical Characteristics at Ta = 25°C, VS = 3.0 V, VDD = 5.0 V Parameter Symbol Conditions Ratings Unit min typ max Operation guaranteed voltage range 1 VOPR 1 V DD system, VS = 2.0 V 1.9 6.5 V Operation guaranteed voltage range 2 VOPR 2 VS system, V DD = 5.0 V 1.6 7.5 V Input low-level threshold voltage VIL ENA1, ENA2, IN1, IN2 –0.3 +1.0 V Input high-level threshold voltage VIH ENA1, ENA2, IN1, IN2 2.0 6.0 V Allowable Operating Conditions at Ta = 25°C 0.2 0.4 0.6 0.8 –20 0 20 40 60 80 100 Pd max — Ta Mounted on a 114.3 · 76.1 · 1.6 mm glass-epoxy printed circuit board Allowable power dissipation, Pdmax — W Ambient temperature, Ta — °C www.onsemi.com

L L Standby mode (zero current drain) H H L H on Channel 1: reverse L H L on Channel 1: forward H H L H on Channel 2: reverse L H L on Channel 2: forward Blank entries indicate “don’t care” states. Blank entries indicate off states. 1 20 VC1 S-GND VC2 Vref ENA1 ENA2 IN1 IN2 FC1 FC2 VS2 OUT4 RFG2 OUT3 OUT2 RFG1 OUT1 VDD SVDD VS1 Top view LB1939T www.onsemi.com

www.onsemi.com Block Diagra m VDD-SW VDDVC1 VS1 OUT1 OUT2 VC2OUT3 OUT4 VS2 FC2RFG2SVDDVREFIN2ENA2ENA1 IN1S--GND FC1 RFG1 70kW 20kW 70k 20k 65kW 80kW 65kW 80kW 65kW 80kW 65kW 80kW Reference voltage logic circuit

Application Circuit Example 1 LB1939T ENA1 ENA2 IN1 IN2 S-GND SVDD Vref VC1 VC2 RFG1 RFG2 OUT1 OUT2 VDD VS2 VS1 OUT3 LB1939T LB1939T OUT4 OUT1 OUT2 OUT3 OUT4 Constant voltage control mode: OUT outputs a 1.75 V, which is Vref (0.9 V) · 1.95. * : FC1 and FC2 are left open. ENA1 ENA2 IN1 IN2 S-GND SVDD Vref VC1 VC2 RFG1 RFG2 VDD CPU CPU VS2 VS1 Constant current control mode: The RFG voltage is controlled so that Vref/4.5 = 0.2 V. Therefore, when RfB is 1 Ω, the circuit operates in constant current drive with Icoil = 0.2 V/1 Ω = 200 mA. *: There are no magnitude constraints on the inputs (ENA, IN) and the supply voltages (VDD , VS). For example, the IC can be operated at VIN = 5 V, VDD = 3 V, and VS = 2 V. FC1 FC2 Application Circuit Example 2 RFB RFB www.onsemi.com

Notes on Constant Current Control Settings The LB1939T constant current control circuit has the structure shown in the figure at the right. The voltage input to the VC pin is resistor divided internally (by 70 kΩ and 20 kΩ resistors) to 1/4.5 and input to the plus (+) input of the constant current control amplifier as reference. The minus (–) input of this constant current control amplifier is connected, through the wire bond resistor Rb (= 0.1 Ω), to the RFG pin. The constant current control circuit operates by comparing the voltage generated by the external current detection resistor connected to the RFG pin and the reference voltage mentioned above. Note that the voltage at VA will be that given by the following formula since the bias current Ib (= 1.5 µA) flows from the constant current control amplifier plus (+) input during constant current control operation. VA = VC/4.5 + Ib · 20 kΩ = VC/4.5 + 0.03 Therefore, the logical expression for setting the constant current Iout is as follows. Iout = VA/(RFB + Rb) LB1939T Application Circuit Example 3 ENA1 ENA2 IN1 IN2 S-GND SVDD VrefVC1 VC2 RFG1 RFG2 OUT1 OUT2 VDD CPU VS2 VS1 OUT3 OUT4 Channel 1 operates in constant voltage control mode: OUT outputs VDD · 3K/(3K + 6K) · 1.95 Channel 2 operates in constant current control mode: The RFG voltage is controlled so that Vref/4.5 = 0.2 V. * : FC1 is left open. FC2 6 kΩ 3 kΩ LB1939T VS R L RFG OUT1 OUT2 Rb = 0.1 Ω RFB Iout VC Constant current control amplifier Pad VA Ib = 1.5 µA 70 kΩ 20 kΩ A13864 www.onsemi.com

www.onsemi.com ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A lis ting of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf . SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components insystems intended for surgical implant into the body, or other applications intended tosupport or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur.Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject t oa l l applicable copyright laws and is not for resale in any manner. LB1939T Constant Current Control Usage Notes This IC supports both constant current control and constant voltage control modes. However, since both of these control circuits operate at all times, certain of the limitations imposed by the constant voltage control circuit apply may when using constant current control. For example, if constant current control is used with the application circuit example 2, if VC = 0.9 V (= Vref) and RFB = 1 Ω, then the output current can be calculated as follows from (1) on the previous page. = 0.23/1.1 0.209A Here, if the value driven load resistance RL is r, since the RFG pin voltage is 0.23 V and the npn transistor output saturation voltage is 0.1 V (typical), the pnp transistor output pin voltage can be calculated as follows. Vout = (RFG pin voltage) + (npn transistor output saturation voltage) + (voltage across the load terminals) = 0.3 + 0.209r At the same time, however, this IC’s internal constant voltage control circuit controls the output voltage as follows. Vout' = VC 1.95 1.75 V Therefore, it will not be possible to use the constant current control mode if the value of r is set so that Vout is greater than Vout'. That is, the condition 0.33 + 0.209r > 1.75 implies that r > 6.79 This means that constant current control can be used when the value of the load resistance used is strictly less than 6.79 .