1FEATURES
• Drives Power MOSFETs or Power Darlingtons
Directly
• 50-V Open Collector High-Side Drivers
• Latched Soft Start
• High-Speed Current-Sense Amplifier with Ideal
Diode
• Pulse-by-Pulse and Average Current Sensing
• Over-Voltage and Under-Voltage Protection
• Direction Latch for Safe Direction Reversal
• Tachometer
• Trimmed Reference Sources 30 mA
• Programmable Cross-Conduction Protection
• Two-Quadrant and Four-Quadrant Operation

DESCRIPTION
The UC3625 family of motorcontroller devices
integrate most of the functions required for highperformance
brushless dc-motor control into one
package. When coupled with external power
MOSFETs or Darlingtons, these devices perform
fixed-frequency PWM motor control in either voltage
or current mode while implementing closed-loop
speed control and braking with smart noise rejection,
safe direction reversal, and cross–conduction
protection.
Although specified for operation from power supplies
between 10 V and 18 V, the UC1625 controls higher
voltage power devices with external level-shifting
components. The UC1625 contains fast, high-current
push-pull drivers for low-side power devices and 50-V
open-collector outputs for high-side power devices or
level-shifting circuitry.
The UC1625 is characterized for operation over the
military temperature range of –55°C to +125°C, while
the UC2625 is characterized from –40°C to +105°C
and the UC3625 is characterized from 0°C to +70°C.
(Note: ESD Protection to 2 kV)