6953

Load Supply Voltage, V_BB...............................50 V
Output Current, I_OUT
(Continuous)  ................................... ±1.5 A*
Logic Supply Voltage, V_CC ..............................7.0 V
Logic/Reference Input Voltage Range,
V_IN..................................-0.3 V to V_CC + 0.3 V
Sense Voltage, V _SENSE
(V_CC = 5.0 V) .....................................1.0 V
(V_CC = 3.3 V)   .................................... 0.4 V
Package Power Dissipation (at T_A = 25°C),
P_D .......................................... 3.47 W
Operating Temperature Range,
TA.....................................-20°C to +85°C
Junction Temperature, T_J...................... .......+150°C†
Storage Temperature Range,
T_S ....................................-55°C to +150°C

* Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of 150°C.

Designed for bidirectional pulse-width modulated (PWM) current control of inductive loads, the A6953SEB is capable of continuous output currents to ±1.5 A and operating voltages to 50 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user's selection of an input reference voltage and external sensing resistor. The fixed off-time pulse duration is set by a userselected external RC timing network. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover current protection. Special power-up sequencing is not required.

With the ENABLE input held low, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. The MODE input of 6953 determines whether the PWM current-control circuitry operates in a slow current-decay mode (only the selected source driver switching) or in a fast current-decay mode (selected source and sink switching). A user-selectable blanking window prevents false triggering of the PWM current-control circuitry. With the ENABLE input held high, all output drivers are disabled. A sleep mode is provided to reduce power consumption.

When a logic low is applied to the BRAKE input, the braking function is enabled. The 6953's overrides ENABLE and PHASE to turn OFF both source drivers and turn ON both sink drivers. The brake function of 6953 can be used to dynamically brake brush dc motors.

The A6953SEB is supplied in a surface-mount, 28-lead plastic leaded chip carrier. The power tab is at ground potential and needs no electrical isolation.