Allegro MicroSystems A4950ELJTR-T

View All Display Drivers by Allegro MicroSystems

Part Number:
A4950ELJTR-T
Manufacturer:
Allegro MicroSystems
Category:
Display Drivers
RoHs:
Non-RoHS Compliant
Datasheet:
Description:
IC MOTOR DRIVER 8V-40V 8SOIC
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Overview

A4950ELJTR-T Full‑Bridge DMOS PWM Motor Driver – Complete Datasheet Summary

1. Basic Information

Device Type: Full‑Bridge DMOS PWM Motor Driver
Part Number: A4950ELJTR-T
Grade: Commercial (E‑grade)
Package: 8‑pin SOICN with exposed thermal pad (suffix LJ)
Packing: 3000 pieces per 13‑inch reel
Lead Status: Lead‑free (Pb‑free), 100% matte tin leadframe plating
Qualification: Commercial grade (not AEC‑Q100)
Target Applications: DC motor PWM speed & direction control

2. Key Features & Benefits

Low on‑resistance RDS(on) DMOS outputs
Adjustable PWM current limiting
Internal synchronous rectification (lowers power dissipation)
Overcurrent Protection (OCP):
Low‑Power Standby mode
Internal Undervoltage Lockout (UVLO)
Crossover‑current (shoot‑through) protection
Thermal shutdown with hysteresis
Two‑wire logic control (IN1, IN2) for direction, speed, brake, coast

3. Operating Conditions

Temperature Ranges

Ambient Operating Temperature (TA): −40 °C to +85 °C
Maximum Junction Temperature (TJ max): 150 °C
Storage Temperature: −55 °C to +150 °C

Voltage & Current

Load Supply Voltage (VBB): 8 V to 40 V
Continuous Output Current (IOUT): ±3.5 A (100% duty cycle)
Transient Output Current (iOUT): ±6 A (tW < 500 ns)
Logic Input Voltage (VIN): −0.3 V to +6 V
VREF Input Voltage: 0 V to +5 V
Sense Voltage (LSS pin): −0.5 V to +0.5 V

4. Absolute Maximum Ratings

表格

Parameter	Symbol	Rating	Unit
Load Supply Voltage	VBB	40	V
Motor Output Voltage	VOUT	−2 to +42	V
Logic Input Voltage	VIN	−0.3 to +6	V
VREF Input Voltage	VREF	−0.3 to +6	V
Sense Voltage (LSS)	VS	−0.5 to +0.5	V
Continuous Output Current	IOUT	3.5	A
Transient Output Current	iOUT	6	A
Operating TA (E‑grade)	TA	−40 to +85	°C
Max Junction Temp	TJ(max)	150	°C
Storage Temp	Tstg	−55 to +150	°C

5. Thermal Characteristics

表格

Parameter	Condition	Value	Unit
Thermal Resistance RθJA	2‑layer PCB (0.8 in² 2‑oz copper)	62	°C/W
Thermal Resistance RθJA	4‑layer JEDEC standard PCB	35	°C/W

6. Electrical Characteristics (TJ = 25 °C, VBB = 8–40 V)

General

表格

Parameter	Symbol	Min	Typ	Max	Unit
Total RDS(on) (source + sink)	–	–	0.6	0.8	Ω	@ IOUT = 2.5 A
Supply Current (IBB)	IBB	–	10	20	mA	fPWM < 30 kHz
Standby Supply Current	–	–	–	10	µA	Low‑Power mode
Body Diode Forward Voltage	Vf	–	–	1.5	V	@ If = ±2.5 A

Logic Inputs

表格

Parameter	Symbol	Min	Typ	Max	Unit
Logic High Voltage	VIN(1)	2.0	–	–	V
Logic Low Voltage	VIN(0)	–	–	0.8	V
Standby Threshold	VIN(STANDBY)	–	–	0.4	V
Input Hysteresis	VHYS	–	250	550	mV

Timing

表格

Parameter	Symbol	Min	Typ	Max	Unit
Crossover Delay	tCOD	50	–	500	ns
Blank Time	tBLANK	2	3	4	µs
Fixed Off‑Time	toff	16	25	34	µs
Standby Entry Delay	tst	–	1	1.5	ms
Power‑Up Delay	tpu	–	–	30	µs

Protection Circuits

表格

Parameter	Symbol	Min	Typ	Max	Unit
UVLO Threshold (rising VBB)	VBBUVLO	7.0	7.5	7.95	V
UVLO Hysteresis	VBBUVLOhys	–	500	–	mV
Thermal Shutdown Temp	TJTSD	–	160	–	°C
Thermal Shutdown Hysteresis	TSDhys	–	15	–	°C

7. Pin Configuration (8‑Pin SOICN LJ)

表格

Pin No.	Name	Function
1	GND	Ground
2	IN2	Logic control input 2
3	IN1	Logic control input 1
4	VREF	Current‑limit reference input
5	VBB	Motor power supply input
6	OUT1	Full‑bridge output 1
7	LSS	Current sense resistor connection
8	OUT2	Full‑bridge output 2
PAD	Exposed thermal pad	Enhanced heat dissipation

8. PWM Control Truth Table

表格

IN1	IN2	10×VS > VREF	OUT1	OUT2	Function
0	1	False	L	H	Reverse
1	0	False	H	L	Forward
0	1	True	H/L	L	Chop (mixed decay), Reverse
1	0	True	L	H/L	Chop (mixed decay), Forward
1	1	False	L	L	Brake (slow decay)
0	0	False	Z	Z	Coast → Standby after 1 ms
Z = high‑impedance state

9. Functional Description

Device Operation

Full N‑channel DMOS bridge with synchronous rectification
Fixed off‑time PWM current regulation
IN1 / IN2 provide simple two‑wire control

Standby Mode

Activated when IN1 and IN2 are low for >1 ms
Reduces quiescent current to ~10 µA
Wake‑up delay: max 30 µs

Current Limit Formula

Max trip current:

ITripMAX=10×RSVREF

VREF = voltage at VREF pin (V)
RS = external current‑sense resistor (Ω)

Protection Mechanisms

Overcurrent Protection (OCP): latches outputs on short
Thermal Shutdown: disables outputs at ~160 °C
UVLO: blocks operation until VBB is valid
Crossover‑current protection prevents shoot‑through

10. Application Information

Recommended External Components

Current‑sense resistor RS: 0.25 Ω (for 2 A at VREF = 5 V)
Decoupling capacitors:

PCB Layout Guidelines

Solid, thick ground plane
Exposed thermal pad soldered directly to PCB with thermal vias
Star ground near LSS / GND
Short, direct traces for power paths (OUT1, OUT2, VBB)

11. Typical Applications

DC motor speed & direction control
Robotics & small actuators
Consumer electronics
Industrial low‑voltage motion control
Battery‑powered motor drives

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