SGM42622B [SGMICRO]

Low Voltage, Dual H-Bridge Stepper Motor Driver;
SGM42622B
型号: SGM42622B
厂家: Shengbang Microelectronics Co, Ltd    Shengbang Microelectronics Co, Ltd
描述:

Low Voltage, Dual H-Bridge Stepper Motor Driver

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中文:  中文翻译
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SGM42622B  
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
GENERAL DESCRIPTION  
FEATURES  
The SGM42622B is a low voltage stepper motor driver  
with control logic and low RDSON MOSFET power stages  
all integrated in a small TQFN package.  
Motor Power Supply Voltage Range: 1.8V to 12V  
1.3A Maximum RMS Output Current  
Low RDSON: 0.5Ω (HS + LS) at +25  
Up to 1/256 Microstepping Resolution  
Adaptive Mixed Current Decay Modes  
Programmable Off-Time  
This device uses fixed off-time PWM current control for  
two independent H-bridges and is capable for fine  
microstepping resolution up to 1/256. Aimed for battery-  
powered applications, it can go to near zero-power  
standby mode for increased battery life.  
Full Set of Protections  
Lossless Over-Current Protection  
Short-Circuit Protection  
A full set of protection features are provided including  
over-current, short-circuit, and thermal shutdown.  
Thermal Shutdown  
Less than 80nA Standby Current for Long  
Battery Life  
The SGM42622B is available in a Green TQFN-3×3-16L  
package. It operates over an ambient temperature  
range of -40to +85.  
-40to +85Operating Temperature Range  
Available in a Green TQFN-3×3-16L Package  
APPLICATIONS  
Toys  
Gaming Machines  
Robotics  
Point of Sale Devices  
Printers  
TYPICAL APPLICATION  
VCC  
CS  
22μF/16V  
CSPO L  
2.2μF/16V  
VDD  
RSTBY  
18kΩ  
14  
6
VCC  
VDD  
REN  
STBY/RESET  
EN/nFAULT  
RSENSEA  
CSTBY  
1nF/6V3  
330mΩ/1W  
4
3
18kΩ  
SENSEA  
OUTA1  
13  
CEN  
10nF/6V3  
2
1
STCK/MODE3  
DIR/MODE4  
MODE1  
M
5
OUTA2  
OUTB1  
16  
15  
11  
12  
10  
SGM42622B  
MODE2  
8
9
OUTB2  
REF  
PWM  
TOFF  
SENSEB  
GND  
7
RSENSEB  
330mΩ/1W  
ROF F  
47kΩ  
(tOF F 37μs )  
RRCOFF  
1kΩ  
CRCOFF  
22nF  
Figure 1. Typical Application Circuit  
SG Micro Corp  
NOVEMBER2022REV. A. 1  
www.sg-micro.com  
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
PACKAGE/ORDERING INFORMATION  
SPECIFIED  
TEMPERATURE  
RANGE  
PACKAGE  
DESCRIPTION  
ORDERING  
NUMBER  
PACKAGE  
MARKING  
PACKING  
OPTION  
MODEL  
O6ETQ  
XXXXX  
SGM42622B  
TQFN-3×3-16L  
SGM42622BYTQ16G/TR  
Tape and Reel, 4000  
-40to +85℃  
MARKING INFORMATION  
NOTE: XXXXX = Date Code, Trace Code and Vendor Code.  
X X X X X  
Vendor Code  
Trace Code  
Date Code - Year  
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If  
you have additional comments or questions, please contact your SGMICRO representative directly.  
OVERSTRESS CAUTION  
ABSOLUTE MAXIMUM RATINGS  
Supply Voltage, VCC........................................ -0.3V to 13.2V  
Logic Input Voltage........................................... -0.3V to 5.5V  
Output-to-Sense Voltage Drop, VOUT - VSENSE..................12V  
Supply-to-Output Voltage Drop, VCC - VOUT .....................12V  
Sense Pin Voltage, VSENSE...................................... -1V to 1V  
Input Reference Voltage, VREF ............................. -0.3V to 1V  
Continuous Power Stage Output Current (Each Bridge)  
Stresses beyond those listed in Absolute Maximum Ratings  
may cause permanent damage to the device. Exposure to  
absolute maximum rating conditions for extended periods  
may affect reliability. Functional operation of the device at any  
conditions beyond those indicated in the Recommended  
Operating Conditions section is not implied.  
ESD SENSITIVITY CAUTION  
I
OUT, RMS ......................................................................1.3ARMS  
Power Dissipation, PD @ TA = +25℃  
This integrated circuit can be damaged if ESD protections are  
not considered carefully. SGMICRO recommends that all  
integrated circuits be handled with appropriate precautions.  
Failureto observe proper handlingand installation procedures  
can cause damage. ESD damage can range from subtle  
performance degradation tocomplete device failure. Precision  
integrated circuits may be more susceptible to damage  
because even small parametric changes could cause the  
device not to meet the published specifications.  
TQFN-3×3-16L...............................................................1.5W  
Junction Temperature.................................................+150℃  
Storage Temperature Range.......................-65to +150℃  
Lead Temperature (Soldering, 10s)............................+260℃  
ESD Susceptibility  
HBM.............................................................................4000V  
CDM ............................................................................1000V  
RECOMMENDED OPERATING CONDITIONS  
Supply Voltage, VCC.............................................1.8V to 12V  
Logic Input Voltage...................................................0V to 5V  
Input Reference Voltage, VREF ............................0.1V to 0.5V  
Logic Inputs Positive/Negative Pulse Width, tINw....... > 300ns  
Operating Temperature Range ......................-40to +85℃  
DISCLAIMER  
SG Micro Corp reserves the right to make any change in  
circuit design, or specifications without prior notice.  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
2
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
PIN CONFIGURATION  
(TOP VIEW)  
STBY/  
RESET nFAULT  
EN/  
MODE1 MODE2  
16  
15  
14  
13  
1
12  
11  
10  
9
DIR/MODE4  
TOFF  
2
3
4
STCK/MODE3  
OUTA1  
REF  
Exposed  
Pad  
OUTB1  
SENSEB  
SENSEA  
5
6
7
8
OUTA2 VCC  
GND OUTB2  
TQFN-3×3-16L  
PIN DESCRIPTION  
PIN  
1
NAME  
DIR/MODE4  
STCK/MODE3  
OUTA1  
TYPE  
FUNCTION  
I
Direction Input or Step Mode Selection Input 4.  
Step Clock Input or Step Mode Selection Input 3.  
Bridge A Output 1.  
2
I
3
O
O
O
-
4
SENSEA  
OUTA2  
Bridge A ISENSE (GND). Connect with a small sensing resistor to power ground.  
Bridge A Output 2.  
5
6
VCC  
Device Supply Voltage.  
7
GND  
G
O
O
O
I
Device Ground.  
8
OUTB2  
SENSEB  
OUTB1  
REF  
Bridge B Output 2.  
9
Bridge B ISENSE (GND). Connect with a small sensing resistor to power ground.  
Bridge B Output 1.  
10  
11  
12  
Current Set Reference Voltage Input.  
Internal Oscillator Frequency Adjustment.  
TOFF  
I
5V Logic-Compliant Power Stage Enable Input or Alert Output. Power stage is shutdown if it is not  
pulled high. This pin is also the device fault output with internal open-drain driver. If a fault occurs, it  
will be pulled down internally.  
13  
EN/nFAULT  
I/OD  
14  
15  
16  
STBY/RESET  
MODE2  
MODE1  
GND  
I
I
5V Logic-Compliant Standby Input. Device goes to low power mode if pulled low.  
Step Mode Selection Input 2.  
I
Step Mode Selection Input 1.  
Exposed  
Pad  
G
Device Ground.  
NOTE: Directions: I = input, O = output, OD = open-drain output, I/O = input/output, G = ground.  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
3
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
ELECTRICAL CHARACTERISTICS  
(TA = +25and VCC = 5V, unless otherwise noted.)  
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Power Supplies  
Power Supply Voltage  
VCC Turn-On Voltage  
VCC Turn-Off Voltage  
VCC Hysteresis Voltage  
VCC  
1.8  
1.1  
1
12  
1.8  
V
V
VCCTH_ON VCC rising from 0V  
VCCTH_OFF VCC falling from 5V  
VCCTH_HYS  
1.47  
1.31  
180  
1.64  
V
mV  
μA  
μA  
nA  
V
No commutations, EN = low, ROFF = 160kΩ  
2700  
2800  
10  
3500  
3650  
80  
VCC Supply Current  
ICC  
No commutations, EN = high, ROFF = 160kΩ  
VSTBY = 0V  
VCC Standby Current  
ICC_STBY  
VSTBYL  
VSTBYH  
Standby Low Logic Level Input Voltage  
Standby High Logic Level Input Voltage  
Power Stage  
0.6  
TA = -40to +85℃  
1.6  
V
TA = -40to +85℃  
VCC = 10V, IOUT = 1.3A  
0.43  
0.5  
40  
0.6  
Total On-Resistance (HS + LS)  
RDSON  
VCC = 3V, IOUT = 0.4A  
0.65  
Rise Time  
tRISE  
tFALL  
tDT  
VCC = 10V, unloaded outputs  
VCC = 10V, unloaded outputs  
ns  
ns  
ns  
Fall Time  
40  
Dead Time  
260  
Current Control  
Sensing Offset  
VSENSE_OFFSET VREF = 0.5V, internal reference 20% VREF  
-15  
15  
mV  
µs  
µs  
µs  
µs  
ROFF = 10kΩ  
tOFF  
9
Total Off-Time  
ROFF = 160kΩ  
106  
Slow Decay Time  
tOFF_SLOW  
tOFF_FAST  
5/8 × tOFF  
3/8 × tOFF  
Fast Decay Time  
Logic IOs  
High Logic Level Input Voltage  
Low Logic Level Input Voltage  
EN Low Logic Level Output Voltage  
STBY Pull-Down Resistance  
EN Pull-Down Current  
VIH  
VIL  
1.6  
V
V
TA = -40to +85℃  
TA = -40to +85℃  
IEN = 4mA  
0.6  
0.8  
VOL  
V
RSTBY  
IPDEN  
145  
12  
kΩ  
µA  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
4
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
ELECTRICAL CHARACTERISTICS (continued)  
(TA = +25and VCC = 5V, unless otherwise noted.)  
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
From EN falling edge to OUT  
high-impedance  
EN Input Propagation Delay  
tENd  
2000  
ns  
MODEx Input Hold Time  
MODEx Input Setup Time  
DIR Input Hold Time  
tMODEho  
tMODEsu  
tDIRho  
From STBY edge  
200  
2
µs  
µs  
From STBY edge  
From STCK rising edge  
From STCK rising edge  
200  
200  
200  
200  
ns  
DIR Input Setup Time  
STCK High Time  
tDIRsu  
ns  
tSTCKH  
tSTCKL  
ns  
STCK Low Time  
ns  
STCK Inputs Frequency  
OCP Retry Time  
fSTCK  
1
MHz  
ms  
tOCP_RETRY  
16  
Protections  
Thermal Shutdown Threshold  
Thermal Shutdown Hysteresis  
Over-Current Protection Threshold  
TTSD  
THYS  
IOCP  
170  
40  
2
A
tDIRsu  
tDIRho  
DIR  
1/fSTCK  
STCK  
tSTCKH  
tSTCKL  
Figure 2. Direction (DIR) and Step Clock (STCK) Timing Diagram  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
5
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
TYPICAL PERFORMANCE CHARACTERISTICS  
Power Stage Resistance vs. Supply Voltage  
Power Stage Resistance vs. Temperature  
1.9  
1.7  
1.5  
1.3  
1.1  
0.9  
0.7  
1.4  
1.3  
1.2  
1.1  
1
3V  
12V  
8V  
0.9  
0.8  
1
3
5
7
9
11  
-50  
-25  
0
25  
50  
75  
100 125  
Supply Voltage(V)  
Temperature ()  
Off-Time vs. ROFF  
1/256 Microstepping Resolution  
120  
100  
80  
60  
40  
20  
0
IOUTA  
IOUTB  
0
40  
80  
120  
160  
200  
Time (50ms/div)  
ROFF ()  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
6
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
FUNCTIONAL BLOCK DIAGRAM  
VBAT  
VCC  
VCC  
SGM42622B  
0
1
STBY/RESET  
REF  
HS/LS OC  
VCC  
EN/nFAULT  
DAC  
-
OUTA1  
+
Stepper  
Motor  
Pre-  
Driver  
OUTA2  
-
SENSEA  
STCK/MODE3  
DIR/MODE4  
MODE1  
+
Control  
Logic  
HS/LS OC  
VCC  
OVT  
OUTB1  
OUTB2  
Pre-  
Driver  
MODE2  
TOFF  
Oscillator  
-
SENSEB  
+
GND  
Figure 3. Block Diagram  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
7
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
FUNCTIONAL DESCRIPTION  
The SGM42622B is a low voltage stepper motor driver  
Figure 4 shows how the step mode is selected for the  
SGM42622B with some examples.  
that includes  
a
10-bit sequencer with 1/256  
microstepping capability, two PWM current controllers  
and two protected full-bridges in power stage.  
VCC  
VCCTH_ON  
STBY/  
RESET  
Standby and Power-Up  
tMODEsu  
tMODEho  
This device can be placed in standby mode to reduce  
the power consumption to near zero by pulling the  
STBY/RESET input pin below the VSTBYL threshold.  
MODE1  
MODE2  
tMODEsu  
tMODEho  
In standby mode, the supply current of the controller is  
significantly reduced and the power stage is shutdown  
with outputs in a high-impedance state.  
MODE3  
(STCK)  
MODE4  
(DIR)  
Once the SGM42622B exits the standby mode, the  
controller restarts like a power-up situation.  
Undetermined  
1/256 Step  
Full-Step  
1/256 Step  
Undetermined  
1/16 Step  
Step Mode  
Microstepping Sequencer  
Figure 4. Mode Selection Examples  
The 4-bit binary value on the MODEx inputs is latched  
just after power-up or when the device exits standby  
mode. In normal operation, the input value is ignored  
and the MODE3 and MODE4 inputs act as step clock  
(STCK) and direction (DIR) inputs. The only exception  
is when MODE1 and MODE2 are both at low state. In  
such condition, the latched value is ignored and the  
device operates in full-step mode. If either MODE1 or  
MODE2 input returns to high state, the previous  
operating mode will be restored.  
The sequencer is a 10-bit counter used to set the PWM  
current controller’s reference and H-bridge current  
direction. The counter resets to zero after power-up or  
standby and is counted with each rising edge of STCK.  
It is increased if DIR = high or decreased if DIR = low.  
The current direction and references that determine the  
output currents of the device as listed in Table 2 for  
full-step mode. VREF is the reference input (0.1V to 0.5V  
recommended) to adjust the output current magnitudes.  
The values for other step modes are listed in Table 2.  
Table 1. Step Mode Selection  
MODE3 MODE4  
MODE1 MODE2  
Step Mode  
full-step (1)  
Table 3 lists the reference and sequencer values for 1/2,  
1/4 and 1/8 step modes. For higher microstepping  
resolutions, the same pattern is extended. Positive  
numbers show that the output current flows from  
OUTx1 to OUTx2, and negative numbers show  
opposite direction.  
(STCK)  
(DIR)  
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1/32 step  
1/128 step  
1/256 step  
full-step - 1/32 step (1)  
In all step modes, the home state (reset) is loaded in  
sequencer at power-up or after exiting the standby  
mode.  
1/4 step  
1/256 step  
1/64 step  
full-step - 1/128 step (1)  
1/256 step  
1/2 step  
1/8 step  
full-step - 1/256 step (1)  
1/64 step  
1/8 step  
1/16 step  
NOTE: 1. If MODE1 = MODE2 = 0 occurs, the latched value  
is ignored temporarily, and stepping will be in full-step mode.  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
8
 
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
FUNCTIONAL DESCRIPTION (continued)  
Table 2. Current Reference and Direction of the Outputs (Determined by the Sequencer Value)  
Phase A  
Phase B  
Reference Voltage  
Sequencer Value  
Current  
Current  
Direction  
Reference Voltage  
Direction  
Full-Step Modes  
0
0
1
1
0
1
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
100% × VREF  
100% × VREF  
100% × VREF  
100% × VREF  
A1 → A2  
A1 → A2  
A1 ← A2  
A1 ← A2  
100% × VREF  
B1 → B2  
B1 ← B2  
B1 ← B2  
B1 → B2  
100% × VREF  
100% × VREF  
100% × VREF  
Non-Full-Step Modes  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Zero (bridge disabled)  
Sin(n/256 × π/2) × VREF  
100% × VREF  
-
100% × VREF  
Cos(n/256 × π/2) × VREF  
Zero (bridge disabled)  
Cos(π/2 + n/256 × π/2) × VREF  
100% × VREF  
B1 → B2  
B1 → B2  
-
n
n
n
n
A1 → A2  
A1 → A2  
A1 → A2  
-
Sin(π/2 + n/256 × π/2) × VREF  
Zero (bridge disabled)  
Sin(n/256 × π/2) × VREF  
100% × VREF  
B1 ← B2  
B1 ← B2  
B1 ← B2  
-
A1 ← A2  
A1 ← A2  
A1 ← A2  
Cos(n/256 × π/2) × VREF  
Zero (bridge disabled)  
Cos(π/2 + n/256 × π/2) × VREF  
Sin(π/2 + n/256 × π/2) × VREF  
B1 → B2  
Table 3. Reference and Sequencer Values for 1/2, 1/4 and 1/8 Step Modes  
VREF  
VREF  
Sequencer  
Value  
VREF  
Phase A  
VREF  
Phase B  
Sequencer  
Value  
1/2 Step 1/4 Step 1/8 Step  
1/2 Step 1/4 Step 1/8 Step  
Phase A Phase B  
0000000000  
home state  
1
1
1
0% 100%  
5
9
17  
0%  
100%  
1000000000  
2
3
19.509% 98.079% 0000100000  
38.268% 92.388% 0001000000  
55.557% 83.147% 0001100000  
70.711% 70.711% 0010000000  
83.147% 55.557% 0010100000  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
-19.509% -98.079%  
-38.268% -92.388%  
-55.557% -83.147%  
1000100000  
1001000000  
1001100000  
1010000000  
1010100000  
1011000000  
1011100000  
1100000000  
1100100000  
1101000000  
1101100000  
1110000000  
1110100000  
1111000000  
1111100000  
2
3
4
5
6
7
8
10  
11  
12  
13  
14  
15  
16  
4
2
3
4
5
6
7
8
-70.711%  
-70.711%  
6
-83.147% -55.557%  
-92.388% -38.268%  
-98.079% -19.509%  
7
92.388% 19.509%  
98.079% 19.509%  
0011100000  
0011100000  
0100000000  
8
9
100%  
0%  
-100%  
0%  
10  
11  
12  
13  
14  
15  
16  
98.079% -19.509% 0100100000  
92.388% -38.268% 0101000000  
83.147% -55.557% 0101100000  
70.711% -70.711% 0110000000  
55.557% -83.147% 0110100000  
38.268% -92.388% 0111000000  
19.509% -98.079% 1000100000  
-98.079%  
-92.388%  
-83.147%  
-70.711%  
-55.557%  
-38.268%  
-19.509%  
19.509%  
38.268%  
55.557%  
70.711%  
83.147%  
92.388%  
98.079%  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
9
 
 
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
FUNCTIONAL DESCRIPTION (continued)  
Reverse voltage is generated by circulating the current  
through the high-side switch.  
PWM Current Control  
Figure 5 shows bridge current flow and PWM timing  
control. Each bridge has its own independent PWM  
current controller. The bridge current flows from its  
negative pole to ground through a sense pin and a  
sense resistor. The sense pin voltage (VSENSEA or  
The reference voltage (VREF) must be chosen based on  
the load peak current and the sense resistance:  
VREF = RSENSEx × ILOAD, PEAK  
(1)  
V
SENSEB) is proportional to the phase current and  
The RSENSEx must be small enough to avoid excessive  
power loss in the resistor and prevent large negative  
voltage peaks on the SENSEx pin caused by current  
recirculation. A few resistances can be paralleled to  
achieve the required power rating and resistance value.  
Note that if the selected RSENSEx is too small, the  
accuracy and performance of the device will be  
degraded due to the low measurement sensitivity and  
influence of the noise and comparator offsets.  
compared to the reference that is set based on the  
sequencer value and VREF (Table 2). As soon as VSENSEx  
exceeds the VREFx value, a comparator triggers the  
off-time and the decay sequence.  
In off-time, the current first decays with a slow rate and  
then with a fast rate. In the slow decay portion, both  
low-side switches of the full-bridge are turned on, and  
output voltage is near zero. When 5/8 of the tOFF_SLOW  
has expired, the polarity of the output voltage is  
reversed by current recirculating to start the fast decay.  
VCC  
VCC  
VCC  
OUTx1  
OUTx2  
OUTx1  
OUTx2  
OUTx1  
OUTx2  
SENSEx  
SENSEx  
SENSEx  
RSENSE  
RSENSE  
RSENSE  
(a)  
(b)  
(c)  
VCC  
VCC  
VCC  
OUTx1  
OUTx2  
OUTx1  
OUTx2  
OUTx1  
OUTx2  
SENSEx  
SENSEx  
SENSEx  
RSENSE  
RSENSE  
RSENSE  
(d)  
(e)  
tOFF  
(f)  
VREFx/RSENSE  
tDT  
tDT  
tDT  
IPHASE  
tOFF_SLOW  
tOFF_FAST  
VREFx  
VSENSEx  
(a)  
(b)  
(c)  
(d)  
(e)  
(f)  
Figure 5. PWM Current Control Sequence  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
10  
 
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
FUNCTIONAL DESCRIPTION (continued)  
Setting PWM Off-Time  
Over-Current Protection (OCP)  
The total off-time (slow decay + fast decay) of the PWM  
is programmed by an external resistor (ROFF) between  
the TOFF pin and ground, as shown in Figure 6. For  
stable regulation, a small series RC branch must be  
placed parallel to the ROFF (see Table 4).  
If the current through any FET exceeds the preset  
over-current threshold, all FETs in the H-bridge will be  
disabled for a period of approximately 16ms, and the  
EN/nFAULT pin will be pulled low. After the period, the  
chip resumes operation and EN/nFAULT pin is released.  
Over-current conditions are sensed in both directions:  
that is, a short to ground, supply, or across the motor  
winding will all result in an over-current shutdown.  
The relationship between the off-time and the external  
resistor value is shown in Off-Time vs. ROFF curve. The  
value typically ranges from 10μs to 120μs.  
Note that over-current protection does not use the  
current sensing circuitry used for PWM current control  
and is independent of the ISENSE resistor value or VREF  
voltage.  
TOFF  
SGM42622B  
RRCOFF  
ROFF  
CRCOFF  
Thermal Shutdown  
If the die temperature (TJ) exceeds the maximum safe  
temperature threshold, a thermal shutdown event  
occurs. With a thermal shutdown the EN/nFAULT pin is  
pulled low by the internal open-drain MOSFET that  
disables the power stage as shown in Figure 7.  
Figure 6. Programming PWM Off-Time  
Table 4. Recommended RRCOFF and CRCOFF  
The EN/nFAULT is released when TJ returns back to  
the safe range (TJ < TTSD - THYS).  
ROFF  
RRCOFF  
1kΩ  
CRCOFF  
22nF  
22nF  
10kΩ ≤ ROFF < 82kΩ  
82kΩ ≤ ROFF ≤ 160kΩ  
2.2kΩ  
Thermal Shutdown  
TTSD  
...  
THYS  
RELEASE  
TJ  
FAULT_MCU  
VEN  
VIH  
VRELEASE  
EN/nFAULT  
IPDEN  
EN_MCU  
EN  
REN  
FAULT  
CEN  
VIL  
...  
...  
TSD OC  
SGM42622B  
Power  
Stage  
MCU  
Enabled  
Disabled  
Enabled  
nFAULT  
tTSD  
Figure 7. Thermal Shutdown in SGM42622B  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
11  
 
 
 
Low Voltage, Dual H-Bridge  
Stepper Motor Driver  
SGM42622B  
REVISION HISTORY  
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.  
NOVEMBER 2022 ‒ REV.A to REV.A.1  
Page  
Updated Functional Block Diagram section..........................................................................................................................................................6  
Changes from Original (DECEMBER 2020) to REV.A  
Page  
Changed from product preview to production data.............................................................................................................................................All  
SG Micro Corp  
www.sg-micro.com  
NOVEMBER 2022  
12  
PACKAGE INFORMATION  
PACKAGE OUTLINE DIMENSIONS  
TQFN-3×3-16L  
D
e
N16  
N1  
L
D1  
E
E1  
k
N5  
b
BOTTOM VIEW  
TOP VIEW  
1.7  
0.7  
A
3.6 2.2 1.7  
A1  
A2  
SIDE VIEW  
0.5  
0.24  
RECOMMENDED LAND PATTERN (Unit: mm)  
Dimensions  
In Millimeters  
Dimensions  
In Inches  
Symbol  
MIN  
MAX  
0.800  
0.050  
MIN  
0.028  
0.000  
MAX  
0.031  
0.002  
A
A1  
A2  
D
0.700  
0.000  
0.203 REF  
0.008 REF  
2.900  
1.600  
2.900  
1.600  
3.100  
1.800  
3.100  
1.800  
0.114  
0.063  
0.114  
0.063  
0.122  
0.071  
0.122  
0.071  
D1  
E
E1  
k
0.200 MIN  
0.500 TYP  
0.008 MIN  
0.020 TYP  
b
0.180  
0.300  
0.300  
0.500  
0.007  
0.012  
0.012  
0.020  
e
L
SG Micro Corp  
www.sg-micro.com  
TX00081.000  
PACKAGE INFORMATION  
TAPE AND REEL INFORMATION  
REEL DIMENSIONS  
TAPE DIMENSIONS  
P2  
P0  
W
Q2  
Q4  
Q2  
Q4  
Q2  
Q4  
Q1  
Q3  
Q1  
Q3  
Q1  
Q3  
B0  
Reel Diameter  
P1  
A0  
K0  
Reel Width (W1)  
DIRECTION OF FEED  
NOTE: The picture is only for reference. Please make the object as the standard.  
KEY PARAMETER LIST OF TAPE AND REEL  
Reel Width  
Reel  
Diameter  
A0  
B0  
K0  
P0  
P1  
P2  
W
Pin1  
Package Type  
W1  
(mm)  
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant  
TQFN-3×3-16L  
13″  
12.4  
3.35  
3.35  
1.13  
4.0  
8.0  
2.0  
12.0  
Q2  
SG Micro Corp  
TX10000.000  
www.sg-micro.com  
PACKAGE INFORMATION  
CARTON BOX DIMENSIONS  
NOTE: The picture is only for reference. Please make the object as the standard.  
KEY PARAMETER LIST OF CARTON BOX  
Length  
(mm)  
Width  
(mm)  
Height  
(mm)  
Reel Type  
Pizza/Carton  
13″  
386  
280  
370  
5
SG Micro Corp  
www.sg-micro.com  
TX20000.000  

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