General Description

The MAX22213 provides four individually controllable

36V, 3.8AMAX half H-bridge drivers. It can be used to drive

four solenoids, two brushed DC motors, one single stepper

motor, or a combination of different loads.

The power FETs have very low impedance resulting in

high driving efficiency and low heat generated. The typical

total RON (high side plus low side) is 0.25Ω (typ). Each

half bridge can be individually PWM controlled by mean of

two logic inputs (DIN_, EN_).

The MAX22213 integrates non-dissipative current sensing,

which eliminates the bulky external power resistors

normally required for this function, resulting in dramatic

space and power saving compared with mainstream applications

based on an external sense resistor. A current proportional

to the internally-sensed load current is output to

the external current-monitor pins (ISEN_). By connecting

an external resistor to these pins, a voltage proportional to

the motor current is generated. The voltage drop across

the external resistors can be input into the controller ADC

whenever the control algorithm requires the current/torque

information.

The maximum output current per half H-bridge is IMAX =

3.8A and is limited by the overcurrent protection (OCP) circuit.

This current can be driven for very short transients

and aims to effectively drive small capacitive loads.

The maximum RMS current per H-bridge is IRMS = 2A assuming

a 4-layer PCB at room temperature. Since this current

is limited by thermal considerations, the actual maximum

RMS current depends on the thermal characteristic

of the application (PCB ground planes, heatsinks, forced

air ventilation etc.).

In applications in which the requirement of the maximum

current is less than 1.5A and high-sensing accuracy is desired,

the half full-scale (HFS) logic input pin can be set

high to halve the current ratings and double the low-side

FET RON. This results in better current-monitor accuracy

in the bottom end of the current range.

The MAX22213 features OCP, thermal shutdown (TSD),

and undervoltage lockout (UVLO). An open-drain, activelow

FAULT pin is activated every time a fault condition is

detected. During TSD and UVLO events, the driver outputs

are three-stated until normal operations are restored.

The MAX22213 is available into a small 5mm x 5mm,

32-pin TQFN and 4.4mm x 9.7mm, 28-pin TSSOP package.

Benefits and Features

● Four Independent Half H-Bridge Drivers

• 36V Maximum Operating Voltage

• 0.25Ω RON (High Side + Low Side) at TA = +25°C

• Fully Independent Half Bridge Control

● Current Ratings per H-Bridge (TA= +25°C):

• IMAX = 3.8A (Impulsive Current for Driving

Capacitive Loads)

• IRMS = 2A

● Internal Current Sensing (ICS) Eliminates External

Bulky Resistors and Improves Efficiency

• Half Full-Scale (HFS) Pin to Improve Current-

Control Accuracy in the Low-Current Range

● Current-Sense Output Monitor

● Fault Indicator Pin (FAULT)

● Protections

• Overcurrent Protection for Each Individual Channel

(OCP)

• Undervoltage Lockout (UVLO)

• Thermal Shutdown TSD = +165°C

● 5mm x 5mm, 32-Pin TQFN and 4.4mm x 9.7mm,

28-Pin TSSOP Packages

Applications

● Stepper-Motor Driver

● Brushed DC Motor Driver

● Solenoid Driver

● Latched Valves