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Ordering number : EN5339
Monolithic Digital IC
LB1846M, 1848M
Low-Voltage/Low Saturation Voltage Type Bidirectional Motor Driver
Overview
The LB1846M and LB1848M are 2-channel low-voltage, low saturation voltage type bidirectional motor driver ICs that are optimal for use as 2-phase stepping motor drivers in printers, floppy disk drives, and cameras and other portable equipment. The output circuits are of the bipolar type, with pnp transistors in the upper side and npn transistors in the lower side, and they achieve low saturation output and low power characteristics despite being provided in a miniature package. Both of these IC products can directly control a motor from signals from a microcontroller. The LB1846M is optimal for 1-2 phase excitation drive for 2-phase stepping motors using 4-input logic (IN1, IN2, IN3, and IN4) and the LB1848M is optimal for 2-phase excitation drive for 2-phase stepping motors using 3-input logic (ENA, IN1, and IN2). Another point is that these ICs include built-in thermal shutdown circuits so that IC scorching or burning is prevented in advance even if the IC outputs are shorted. Additionally, the MFP-10S miniature package used supports reduced-space mounting.
Package Dimensions
unit: mm 3086A-MFP10S
[LB1846M, 1848M]
SANYO: MFP10S
Features
* Optimal for 1-2 phase excitation drive for 2-phase stepping motors (LB1846M) * Optimal for 2 phase excitation drive for 2-phase stepping motors (LB1848M) * Low saturation voltage. VO(sat) = 0.55 V typical at IO = 400 mA * Standby current: zero * Thermal shutdown circuit * Miniature package: MFP-10S (6.5 x 5.1 mm) * Through-current prevention circuit (LB1848M only) * "Soft off" function that reduces power supply line noise when switching from drive to standby modes. (Requires the use of one external capacitor.) (LB1848M only) * No limitations on the magnitude relationship between the power supply voltage (VCC) and the input voltage (VIN)
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TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
O3096HA (OT) No. 5339-1/6
LB1846M, 1848M
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Output voltage Input voltage Ground pin outflow current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max VOUT VIN IGND Pd max1 Pd max2 Topr Tstg Per channel Independent IC When mounted* Conditions Ratings -0.3 to +8.0 VCC + VSF -0.3 to +8.0 800 350 870 -20 to +75 -40 to +150 Unit V V V mA mW mW C C
Note: *On the specified circuit board (a 114.3 x 76.2 x 1.5-mm glass-epoxy printed circuit board)
Allowable Operating Ranges at Ta = 25C
Parameter Supply voltage Input high-level voltage Input low-level voltage Symbol VCC VIH VIL Conditions Ratings 2.5 to 7.5 2.0 to 7.5 -0.3 to +0.7 Unit V V V
Electrical Characteristics at Ta = 25C, VCC = 5.0 V
Parameter [LB1846M] Current drain ICC0 ICC1 VOUT1 Output saturation voltage VOUT2 Input current [Spark Killer Diode] Reverse current Forward voltage [LB1848M] Current drain ICC0 ICC1 VOUT1 Output saturation voltage VOUT2 Input current 1 Input current 2 [Spark Killer Diode] Reverse current Forward voltage IS(leak) VSF IOUT = 400 mA 30 1.7 A V IIN IENA ENA = 0 V, VIN = 3 V or 0 V ENA = 3 V, VIN = 3 V or 0 V ENA = 3 V, VIN = 3 V or 0 V, VCC = 3 to 7.5 V, IOUT = 200 mA ENA = 3 V, VIN = 3 V or 0 V, VCC = 4 to 7.5 V, IOUT = 400 mA VIN = 5 V ENA = 5 V 0.1 25 0.27 0.55 75 85 10 35 0.4 0.8 100 110 A mA V V A A IS(leak) VSF IOUT = 400 mA 30 1.7 A V IIN IN1, 2, 3, 4 = 0 V IN1, 3 = 3 V, IN2, 4 = 0 V VIN = 3 V or 0 V, VCC = 3 to 7.5 V, IOUT = 200 mA VIN = 3 V or 0 V, VCC = 4 to 7.5 V, IOUT = 400 mA VIN = 5 V 0.1 30 0.27 0.55 150 10 40 0.4 0.8 200 A mA V V A Symbol Conditions Ratings min typ max Unit
Note: The thermal shutdown circuit function values are design guarantees, and are not tested.
Pin Assignments
No. 5339-2/6
LB1846M, 1848M Block Diagrams [LB1846M]
[LB1848M]
Note: When the "soft off" function is used, a capacitor must be connected to the SOF pin. If this function is not used, this pin must be left open with absolutely no signals or lines connected.
Notes on Wiring and Lines Since large currents flow in the VCC and ground lines, oscillations may occur on these lines. The following points should be observed if such oscillations occur. (1) Lower the line impedances by making them shorter and thicker. (2) Attach capacitors close to the IC. (3) If the controller (CPU) is mounted on a separate printed circuit board, insert series resistors (of about 10 k) between the controller outputs and this IC.
No. 5339-3/6
LB1846M, 1848M Truth Tables [LB1846M]
IN1 L H H L L L L L H H -- IN2 L L L L H H H L L H -- IN3 L L H H H L L L L -- H IN4 L L L L L L H H H -- H OUT1 OFF H H OFF L L L OFF H OUT2 OFF L L OFF H H H OFF L OUT3 OFF OFF H H H OFF L L L OUT4 OFF OFF L L L OFF H H H 1-2 phase excitation Notes Standby
The logic output for the first high-level input is produced. *2
Note: 1. "--" indicates a "don't care" input. 2. If two high levels (H/H) are input to the IN1/IN2 pins with the timing shown in x in the figure below, then the IN2 input that arrived later will be ignored and the IC will function as though an H/L combination is applied to the IN1/IN2 pins. Similarly, the timing shown in results in a L/H combination on the IN1/IN2 pins.
[LB1848M]
ENA L IN1 -- L L H H H IN2 -- L H H L OUT1 OFF H H L L OUT2 OFF L L H H OUT3 OFF H L L H OUT4 OFF L H H L 2-phase excitation Notes Standby
Note: "--" indicates a "don't care" input.
No. 5339-4/6
LB1846M, 1848M SOF Pin ("Soft Off" Function) Operation [LB1848M only] The soft off function reduces power supply line noise due to the kickback current generated when the stepping motor drive mode is switched from drive to standby. The "soft off" function provided by this IC operates when a capacitor (0.001 to 0.01 F) is connected between the SOF pin and ground. (Leave the SOF pin open to disable the soft off function.) The waveforms for each pin are shown below.
Timing Chart for Stepping Motor 2-Phase Excitation
No. 5339-5/6
LB1846M, 1848M
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s 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 October, 1996. Specifications and information herein are subject to change without notice. No. 5539-6/6

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