Ordering number : ENN6194 Monolithic Digital IC LB1939T 2 Channel H Bridge Constant Voltage/ Constant Current Driver IC Overview Package Dimensions The LB1939T is a two-phase excitation bipolar stepping motor driver that features low voltage operation, a low saturation voltage, and low power consumption. It supports constant voltage and constant current drive, can control two iris motors, and is optimal for shutter, iris, and AF drive in 3 V battery operated still digital cameras and other battery operated equipment. unit: mm 3246-TSSOP20 [LB1939T] 20 0.5 6.5 4.4 6.4 11 Features 1 0.22 10 0.15 (1.0) 1.2max 0.65 (0.33) 0.08 • 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 = VDD = 1.9 to 7.5 V • Low saturation voltage output: Vosat = 0.3 V at IO = 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) SANYO: TSSOP20 Specifications Absolute Maximum Ratings at Ta = 25°C Ratings Unit Maximum supply voltage Parameter VBmax VS1, VS2, VDD –0.3 to +10.5 V Applied output voltage VOUT OUT1, 2, 3, 4 –0.3 to +10.5 Maximum output current: OUT1, 2, 3, and 4 IOmax t ≤ 10 ms 400 ENA, IN, VC 10.5 V 0.8 W Applied input voltage Symbol VIN Allowable power dissipation Pdmax Conditions When mounted on a printed circuit board* V mA Operating temperature Topr –20 to +85 °C Storage temperature Tstg –55 to +150 °C Note: Circuit board: 114.3 × 76.1 × 1.6 mm3 glass epoxy board Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 22704TN (OT) No. 6194-1/7 LB1939T Allowable Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings min typ Unit max Operation guaranteed voltage range 1 VOPR1 VDD system, VS = 2.0 V 1.9 6.5 Operation guaranteed voltage range 2 VOPR2 VS system, VDD = 5.0 V 1.6 7.5 V 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 Electrical Characteristics at Ta = 25°C, VS = 3.0 V, VDD = 5.0 V Parameter Symbol Standby mode current drain Conditions Ratings min typ Unit max ISTB VS = VDD = 6.5 V VREF output voltage VREF IOL = 0 to 1 mA SVDD output voltage VSVDD IOL = 10 mA OUT pin output saturation voltage 1 (Saturation control mode) Vosat1 VDD = 5.0 V, VC = SVDD, VS = 2.0 V IO = 200 mA (PNP transistor side) 0.20 0.30 V OUT pin output saturation voltage 2 (Saturation control mode) Vosat2 VDD = 5.0 V, VC = SVDD, VS = 2.0 V IO = 200 mA (NPN transistor side) 0.10 0.15 V OUT pin output voltage 1 (Constant voltage control mode) VOUT1 VDD = 6.0 V, VC = 1.5 V, VS = 3.5 V IO = 200 mA (PNP transistor side) 2.8 2.9 3.0 V OUT pin output voltage 2 (Constant voltage control mode) VOUT2 VDD = 6.0 V, VC = VREF, VS = 2.0 V IO = 200 mA (PNP transistor side) 1.65 1.75 1.85 V OUT pin output current 1 (Constant current control mode) IOUT1 VDD = 6.0 V, VC = 0.9 V, VS = 3.5 V RL = 5 Ω (between OUT and OUT), RFB = 1 Ω 197 210 223 mA OUT pin output current 2 (Constant current control mode) IOUT2 VDD = 6.0 V, VC = VREF, VS = 2.0 V RL = 5 Ω (between OUT and OUT), RFB = 1 Ω 189 210 231 mA 0.1 1.0 µA 0.85 0.9 0.95 V 4.7 4.8 [Regulator Output Circuit] V [H Bridge Output Circuit] VS system operating current drain 1 IS1 VC = SVDD 4 7 mA VS system operating current drain 2 IS2 VC = VREF 1.5 3 mA VDD system operating current drain 1 IDD1 VC = SVDD ENA1 = 2 V 4 7 mA VDD system operating current drain 2 IDD2 VC = VREF ENA1 = 2 V 4 7 mA VC input voltage range VC 0.1 VC input current IVC VDD = 6.0 V, VS = 2.0 V, VC = 5.0 V IIH VIH = 5.5 V IIL VIL = GND 0 7 V 50 100 µA 70 100 µA 0 µA [Control Input Circuit] Control pin maximum input current –1 Allowable power dissipation, Pdmax — W Pd max — Ta 1 Mounted on a 114.3 × 76.1 × 1.6 mm glass-epoxy printed circuit board 0.8 0.6 0.4 0.2 0 –20 0 20 40 60 80 100 Ambient temperature, Ta — °C No. 6194-2/7 LB1939T Truth Table Input Output ENA IN 1 2 L L H H 1 OUT 2 3 SVDD 4 Mode 1 2 H L H on Channel 1: reverse L H L on Channel 1: forward Standby mode (zero current drain) 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. Pin Assignment VC1 1 20 VS1 S-GND 2 19 SVDD VC2 3 18 VDD Vref 4 17 OUT1 ENA1 5 16 RFG1 LB1939T ENA2 6 15 OUT2 IN1 7 14 OUT3 IN2 8 13 RFG2 FC1 9 12 OUT4 FC2 10 11 VS2 Top view No. 6194-3/7 20 KΩ 70 KΩ S-GND VC1 FC1 VS1 RFG1 OUT2 80 KΩ ENA1 65 KΩ OUT1 80 KΩ ENA2 65 KΩ VDD-SW IN1 65 KΩ 80 KΩ Reference voltage logic circuit VDD 65 KΩ IN2 80 KΩ Vref = 0.9 V SVDD OUT3 OUT4 RFG2 VS2 FC2 20 KΩ 70 KΩ VC2 LB1939T Block Diagram No. 6194-4/7 LB1939T Application Circuit Example 1 VDD VS2 VS1 ENA1 ENA2 CPU OUT1 OUT2 IN1 LB1939T IN2 OUT3 OUT4 S-GND SVDD Vref VC1 VC2 RFG1 RFG2 Constant voltage control mode: OUT outputs a 1.75 V, which is Vref (0.9 V) × 1.95. * : FC1 and FC2 are left open. Application Circuit Example 2 VDD VS2 VS1 ENA1 OUT1 ENA2 CPU OUT2 IN1 LB1939T IN2 OUT3 OUT4 S-GND FC1 SVDD FC2 Vref VC1 VC2 RFG1 RFG2 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. No. 6194-5/7 LB1939T Application Circuit Example 3 VS2 VDD VS1 ENA1 ENA2 OUT1 OUT2 IN1 CPU LB1939T IN2 OUT3 OUT4 S-GND FC2 SVDD 6 kΩ VC1 Vref VC2 RFG1 RFG2 3 kΩ 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. 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 VS VC Constant current control amplifier 70 kΩ OUT1 VA RL 20 kΩ Ib = 1.5 µA Iout OUT2 Pad Rb = 0.1 Ω RFG RFB A13864 Therefore, the logical expression for setting the constant current Iout is as follows. Iout = VA/(RFB + Rb) = (VC/4.5 + 0.03) / (RFB + Rb) ......(1) No. 6194-6/7 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 shown in figure 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. Iout = (0.9/4.5 + 0.03) / (1 + 0.1) = 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) = 0.23 + 0.1 + 0.209 × r = 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 Ω. Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer’s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer’s products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification” for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of February, 2004. Specifications and information herein are subject to change without notice. PS No. 6194-7/7