Product Summary

The LB1921 is a single-chip motor driver circuit that provides direct PWM drive output appropriate for driving the power brushless motors used in office automation equipment. The LB1921 also provides a variety of peripheral functions, including speed control and FG amplifier circuits, on chip. The applications of the LB1921 include Paper feed and drum motor drivers in FAX and PPC
units.

Parametrics

LB1921 absolute maximum ratings: (1)Maximum supply voltage, VCC max: 30 V; (2)Maximum supply voltage, VM max: 30 V; (3)Output current, IO max: 3.5 A when T ≤ 100 ms; (4)Allowable power dissipation, Pd max1: 3 W when Independent IC; (5)Allowable power dissipation, Pd max2: 20 W when With an arbitrarily large heat sink; (6)Operating temperature, Topr: –20 to +80℃; (7)Storage temperature, Tstg: –55 to +150℃.

Features

LB1921 features: (1)The LB1921 is an improved output current version of the LB1824; (2)Three-phase bipolar brushless motor driver; (3)Digital speed control circuit; (4)Thermal shutdown circuit; (5)Start/stop pin; (6)Lock detector output; (7)Crystal oscillator and divider circuits; (8)FG and error amplifiers; (9)Power supply current limiter.

Diagrams

LB1921 equivalent circuit block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LB1921
LB1921

Other


Data Sheet

Negotiable 
Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LB1906CL
LB1906CL

Other


Data Sheet

Negotiable 
LB1909M
LB1909M

Other


Data Sheet

Negotiable 
LB1909MC-AH
LB1909MC-AH

ON Semiconductor

Motor / Motion / Ignition Controllers & Drivers Step Motor Driver IC for 2-phase Excit

Data Sheet

0-1730: $0.86
1730-2500: $0.80
2500-5000: $0.77
LB1909MC-BH
LB1909MC-BH

ON Semiconductor

Motor / Motion / Ignition Controllers & Drivers STEPPING MOTOR DRIVER

Data Sheet

0-1: $1.50
1-25: $1.35
25-100: $1.23
100-250: $1.11
LB1909MCGEVB
LB1909MCGEVB

ON Semiconductor

Power Management IC Development Tools EVABORD FOR LB1909MC

Data Sheet

0-1: $38.96
LB1909M-TE-L-E
LB1909M-TE-L-E

ON Semiconductor

Motor / Motion / Ignition Controllers & Drivers 2.5-16V Stepping Motor Driver

Data Sheet

0-1: $1.34
1-25: $1.09
25-100: $0.98
100-250: $0.86