Ordering number : ENA0612
Bi-CMOS LSI
LV8743V
PWM Constant-Current Control Stepping Motor
Driver and Switching Regulator Controller
Overview
The LV8743V is a PWM constant-current control stepping motor driver and switching regulator controller IC.
Features
• Provides a single PWM constant-current control stepping motor driver circuit
• Two switching regulator controller circuits
• Can control stepping motors with up to W1-2 phase commutation
• Built-in high-precision reference voltage circuit
• Timer/latch type short circuit protection circuit
• Built-in high and low side regenerative diodes
• Thermal shutdown circuit
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
VM max
40
VCC max
6
V
VO max
40
V
Output voltage
Driver output peak current
MDIO peak
Driver output continuous current
MDIO max
Regulator output current
SWIO max
Allowable power dissipation
Conditions
tw ≤ 10ms, duty 20%
Pd max1
Independent IC
Pd max2
Mounted on a circuit board.*
Ratings
Unit
V
800
mA
500
mA
120
mA
0.5
W
2.8
W
Operating temperature
Topr
-20 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
* Specified circuit board : 90×90×1.7mm3 : 2-layer glass epoxy printed circuit board
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer' s products or
equipment.
22807 MS PC 20060516-S00009 No.A0612-1/21
LV8743V
Recommended Operating Ratings at Ta = 25°C
Parameter
Supply voltage range
Logic input voltage
VREF1 input voltage
Regulator output voltage
Regulator output current
Error amplifier input voltage
Symbol
Conditions
Ratings
Unit
VM
10 to 35
V
VCC
4.5 to 5.5
V
VIN
0 to VCC+0.3
V
VREF1
0 to 3
V
VO
10 to VM
V
IO
0 to 100
mA
VOA
0 to 3
V
Timing capacitor
CT
100 to 15000
pF
Timing resistor
RT
5 to 50
kΩ
10 to 800
kHz
Triangle wave frequency
FOSC
Electrical Characteristics at Ta = 25°C, VM = 24V, VCC = 5V, VREF1 = 1.5V
Parameter
Symbol
Ratings
Conditions
min
typ
Unit
max
Overall Characteristics
VM current consumption
VCC current consumption
IM
PS = High, no load
2.5
3.5
mA
ICC
PS = High, no load
3.5
4.5
mA
VCC low-voltage cutoff voltage
VthVCC
3.2
3.5
3.8
V
Low-voltage cutoff hysteresis
VthHIS
60
110
160
mV
TSD
Design guarantee
180
°C
∆TSD
Design guarantee
40
°C
Step-up voltage
VGH
VM = 24V, VCC = 5V
Rise time
tONG
VGH = 10µF
Oscillator frequency
Fchop
Thermal shutdown temperature
Thermal shutdown hysteresis
Motor Drivers [Charge pump block]
28.3
28.8
29.3
V
50
100
ms
120
150
kHz
IO = 300mA, sink side
1.1
1.4
Ω
1.5
1.8
Ω
50
µA
1.0
1.3
V
3
8
15
µA
30
50
70
µA
0.8
V
90
[Output block]
Output on resistance
Ron1
Ron2
IO = -300mA, source side
Output leakage current
IOleak
VO = 35V
Diode forward voltage
VD
ID = -300mA
IINL
VIN = 0.8V
IINH
VIN = 5V
[Logic input block]
Logic pin input current
Logic high-level input voltage
VINH
Logic low-level input voltage
VINL
2.0
V
[Current control block]
VREF input current
IREF1
VREF1 = 1.5V
µA
-0.5
CR pin current
ICR
CR = 1.0V
-1.6
-1.25
-0.9
MD pin voltage
VMD
MD = open
3.21
3.38
3.55
mA
V
Current setting comparator
VHH
VREF1 = 1.5V, IO = H, I1 = H
0.291
0.300
0.309
V
threshold voltage
VLH
VREF1 = 1.5V, IO = L, I1 = H
0.191
0.200
0.209
V
VHL
VREF1 = 1.5V, IO = H, I1 = L
0.093
0.100
0.107
V
2.475
2.500
2.525
Switching Regulator Controller [Reference voltage block]
Output voltage
VREGS
Iregs = -1mA
V
Input stability
VDLI
VM = 10 to 35V
10
mV
Load stability
VDLO
Iregs = 0 to -3mA
10
mV
Oscillator frequency
FOSC
RT = 10kΩ, CT = 200pF
400
440
kHz
Frequency stability
FDV
VM = 10 to 35V
1
5
%
Current setting pin voltage
VRT
RT = 10kΩ
1.03
V
[Triangle wave oscillator block]
360
0.89
0.96
Continued on next page.
No.A0612-2/21
LV8743V
Continued from preceding page.
Parameter
Symbol
Ratings
Conditions
min
typ
Unit
max
[Protection circuit block]
Comparator threshold voltage
VthFB
Standby voltage
FB3, FB4
VstSCP
Source current
1.38
1.53
ISCP = 40µA
ISCP
VSCP = 0V
Threshold voltage
VthSCP
Latch voltage
VltSCP
ISCP = 40µA
Source current
ISOFT
VSOFT = 0V
Latch voltage
VltSOFT
1.68
V
100
mV
µA
1.5
2.4
3.3
1.55
1.7
1.85
V
100
mV
[Soft start circuit block]
1.15
1.45
ISOFT = 40µA
1.75
µA
100
mV
[Low input voltage malfunction prevention circuit]
Threshold voltage
VUT
8.4
8.8
9.2
V
Hysteresis voltage
VHIS
240
340
440
mV
[Error amplifier block]
Input offset voltage
Vio
6
mV
Input offset current
Iio
30
nA
Input bias current
Iib
100
nA
Open-loop gain
AV
Common-mode input voltage range
Common-mode rejection ratio
85
VCM
VM = 10 to 35V
CMRR
Maximum output voltage
VOH
Minimum output voltage
VOL
dB
3.0
80
4.5
V
dB
5.0
V
0.2
0.5
V
Output sink current
Isi
FB = 2.5V
300
600
1000
µA
Output source current
Iso
FB = 2.5V
45
75
105
µA
[PWM comparator block]
Input threshold voltage
Duty cycle = 100%
0.90
0.96
1.02
V
(Fosc = 10kHz)
VT100
VT0
Duty cycle = 0%
0.45
0.48
0.51
V
Input bias current
IBDT
DT = 0.4V
1
µA
Maximum duty cycle
Don
With the VREGS voltage divided by 17kΩ
57
67
77
%
7
10
Ω
5
µA
and 8kΩ resistors
[Output block]
Output on resistance
Leakage current
Ron
IO = 75mA
ILEAK
VO = 35V
Package Dimensions
unit : mm (typ)
3333
TOP VIEW
SIDE VIEW
BOTTOM VIEW
15.0
44
23
(3.5)
0.5
5.6
7.6
(4.7)
0.22
22
0.2
1.7MAX
0.65
SIDE VIEW
0.1 (1.5)
1
(0.68)
SANYO : SSOP44K(275mil)
No.A0612-3/21
LV8743V
Pd max – Ta
Allowable power dissipation, Pd max – W
3.5
3.0
*1 With components mounted on the exposed die-pad board
*2 With no components mounted on the exposed die-pad board
Two-layer circuit board 1 *1
2.8
2.5
Two-layer circuit board 2 *2
2.0
2
1.5
1.46
1.04
1.0
0.5
Independent IC
0.5
0.26
0
– 20
0
20
40
60
80
100
Ambient temperature, Ta – °C
Substrate Specifications (Substrate recommended for operation of LV8743V)
Size
: 90mm × 90mm × 1.7mm (2-layer substrate [2S0P])
Material
: Glass epoxy
Copper wiring density : L1 = 80% / L2 = 90%
L1 : Copper wiring pattern diagram
L2 : Copper wiring pattern diagram
Cautions
1) The data for the case with the Exposed Die-Pad substrate mounted shows the values when 95% or more of the
Exposed Die-Pad is wet.
2) For the set design, employ the derating design with sufficient margin.
Stresses to be derated include the voltage, current, junction temperature, power loss, and mechanical stresses such as
vibration, impact, and tension.
Accordingly, the design must ensure these stresses to be as low or small as possible.
The guideline for ordinary derating is shown below :
(1)Maximum value 80% or less for the voltage rating
(2)Maximum value 80% or less for the current rating
(3)Maximum value 80% or less for the temperature rating
3) After the set design, be sure to verify the design with the actual product.
Confirm the solder joint state and verify also the reliability of solder joint for the Exposed Die-Pad, etc.
Any void or deterioration, if observed in the solder joint of these parts, causes deteriorated thermal conduction,
possibly resulting in thermal destruction of IC.
No.A0612-4/21
LV8743V
Pin Assignment
CR2 1
44 GND
PHA2 2
43 OUT4
I12 3
42 OUT3
IO2 4
41 VMSW
PS 5
40 INV4
PGND1 6
39 FB4
GND 7
38 DT4
OUT2B 8
37 NON4
RNF2 9
36 INV3
OUT2A 10
35 FB3
VMM 11
LV8743V
34 DT3
OUT1B 12
33 NON3
RNF1 13
32 SOFT
OUT1A 14
31 SCP
PGND2 15
30 CREG
VG 16
29 RT
VM 17
28 CT
CP2 18
27 VREGS
CP1 19
26 MD
VCC 20
25 PHA1
VREF1 21
24 I11
CR1 22
23 IO1
Top view
PCA01177
No.A0612-5/21
LVS
I01 I11
+
PHA1
Current selecting
D/A converter
Pre-output stage
GND
OUT1B
MD
OUT2B
One-shot
multivibrator
CR2
RNF2
Current selecting
D/A converter
PHA2 I02 I12
+
Output control logic
OUT2A
Blanking time
CR2 PS
Blanking time
PS
VMM
One-shot
multivibrator
Output control logic
OUT1A
Pre-output stage
TSD
RNF1
Pre-output stage
GND
+
-
Charge
pump
VG
Pre-output stage
VREF1
PGND2
PGND1
+
-
VCC
VM
CP1 CP2
CT
DT3 DT4
Triangle wave
oscillator
OUT4 OUT3 RT
Protection
circuit LVS
+
-
+
-
Internal
reference
voltage
+
+
+
+
-
5V
Constant Current
+
+
-
2.5V
reference
voltage
VREGS
SCP
SOFT
FB4
NV4
NON4
NON3
NV3
FB3
CREG
VMSW
+
-
LV8743V
Block Diagram
No.A0612-6/21
LV8743V
Pin Functions
Pin No.
Pin
Description
11
VMM
Driver output system power supply
14
OUT1A
Driver channel 1 OUTA output pin
12
OUT1B
Driver channel 1 OUTB output pin
13
RNF1
Driver channel 1 current sensing resistor connection
10
OUT2A
Driver channel 2 OUTA output pin
8
OUT2B
Driver channel 2 OUTB output pin
9
RNF2
Driver channel 2 current sensing resistor connection
6
PGND1
Driver output system ground
21
VREF1
Driver output current setting reference voltage input
23
I01
Driver channel 1 output current setting input
24
I11
25
PHA1
Driver channel 1 output phase switching input
22
CR1
Driver channel 1 off time setting RC circuit connection
4
I02
Driver channel 2 output current setting input
3
I12
2
PHA2
Driver channel 2 output phase switching input
1
CR2
Driver channel 2 off time setting RC circuit connection
26
MD
Driver system mixed decay setting
5
PS
Driver system enable input
20
VCC
Control system power supply
44
GND
Ground
41
VMSW
Switching regulator control system power supply
27
VREGS
Regulator system reference voltage output
33
NON3
Regulator system error amplifier 3 noninverting input
36
INV3
Regulator system error amplifier 3 inverting input
35
FB3
Regulator system error amplifier 3 output
34
DT3
Regulator system output 3 maximum duty setting
42
OUT3
Output 3
37
NON4
Regulator system error amplifier 4 noninverting input
40
INV4
Regulator system error amplifier 4 inverting input
39
FB4
Regulator system error amplifier 4 output
38
DT4
Regulator system output 4 maximum duty setting
43
OUT4
Output 4
28
CT
Regulator system external timing capacitor connection
29
RT
Regulator system external timing resistor connection
32
SOFT
Soft startup setting
31
SCP
Regulator system timer/latch setting
17
VM
Power supply
15
PGND2
Power system ground
16
VG
Charge pump capacitor connection
19
CP1
Charge pump capacitor connection
18
CP2
Charge pump capacitor connection
30
CREG
Internal power supply stabilization capacitor connection
7
GND
Ground
No.A0612-7/21
LV8743V
Equivalent Circuits
Pin No.
Pin
23
I01
24
Il1
25
PHA1
5
PS
4
I02
3
I12
2
PHA2
Equivalent Circuit
VCC
5kΩ
100kΩ
GND
8
OUT2B
9
RNF2
10
OUT2A
11
VMM
12
OUT1B
13
RNF1
14
OUT1A
11
14 10
12 8
13
9
19
CP1
16
VG
17
VM
18
CP2
19
VCC
17
18
16
200kΩ
GND
Continued on next page.
No.A0612-8/21
LV8743V
Continued from preceding page.
Pin No.
21
Pin
Equivalent Circuit
VREF1
VCC
4pF
500Ω
500Ω
GND
22
CR1
1
CR2
VCC
100kΩ
10kΩ
500Ω
500Ω
500Ω
25kΩ
500Ω
500Ω
15kΩ
50kΩ
GND
26
MD
VCC
100kΩ
30kΩ
500Ω
500Ω
63kΩ
GND
50kΩ
Continued on next page.
No.A0612-9/21
LV8743V
Continued from preceding page.
Pin No.
Pin
41
VMSW
30
CREG
Equivalent Circuit
41
5V
1kΩ
30
GND
27
VREGS
5V
VMSW
GND
33
NON3
36
INV3
35
FB3
37
NON4
40
INV4
39
FB4
5V
36 40
VMSW
VMSW
500Ω
500Ω
35 39
500Ω
500Ω
SOFT
GND
VMSW
33
37
Continued on next page.
No.A0612-10/21
LV8743V
Continued from preceding page.
Pin No.
Pin
34
DT3
38
DT4
Equivalent Circuit
5V
VMSW
500Ω
500Ω
CT
500Ω
FB
GND
29
RT
28
CT
5V
1V
500Ω
500Ω
500Ω
500Ω
GND
VMSW
28
42
OUT3
43
OUT4
5V
29
VMSW
GND
Continued on next page.
No.A0612-11/21
LV8743V
Continued from preceding page.
Pin No.
32
Pin
Equivalent Circuit
SOFT
5V
500Ω
GND
VMSW
31
SCP
5V
500Ω
GND
VMSW
No.A0612-12/21
LV8743V
Stepping Motor Driver
(1) STM output control logic
Parallel input
PS
Output
PHA
OUTA
OUTB
Current direction
Low
*
Off
Off
Standby
High
Low
Low
High
OUTB→OUTA
High
High
High
Low
OUTA→OUTB
(2) STM constant-current settings
I0
I1
Output current
High
High
Low
High
((VREF1/5) /RNF) × 2/3 = IO (100%) × 2/3
High
Low
((VREF1/5) /RNF) × 1/3 = IO (100%) × 1/3
Low
Low
0
(VREF1/5) /RNF = IO (100%)
The STM driver constant-current control settings consist of the VREF1 voltage setting, the I0 and I1 current settings,
and the resistor (RNF) connected between RNF and ground. The current is set according to the following equation.
Iconst [A] = ((VREF1 [V] /5) /RNF [Ω]) × attenuation ratio
Here VREF1 = 1.5V, I0 = I1 = high, and RNF = 1Ω. Iconst can be determined from the following equation.
Iconst = 1.5V/5/1Ω × 1 = 0.3A
(3) Procedure for setting the CR pin constants (the off period and noise canceller time settings)
The following are set by connecting a capacitor and resistor to the CR pin.
(a) The switching off time (Toff) in constant-current control mode
(b) The noise cancellation time (Tn) used to prevent malfunctions due to spike noise when switching from decay to
charge mode.
Use the following equations to determine the values for the capacitor and resistor.
(a) Switching off time (Toff)
Toff ≈ -C×R×ln (1.5/4.8) [sec]
(b) Noise cancellation time (Tn)
Tn ≈ C×R×ln {(1.5 - RI)/(4.0 - RI)} [sec]
I : The CR pin charge current (1.25mA, typical)
No.A0612-13/21
LV8743V
(4) Constant-current control timing chart
Set current
Output current
MD pin level
CR
30%
70%
OUTA
OUTB
CHARGE FAST
SLOW
When the MD pin is in the open state, the LV8743V's stepping motor constant-current control attenuates the current in
fast decay mode for 30% of the off time determined by the CR pin RC circuit, and in slow decay mode for 70% of that
time.
This mixed decay ratio can be adjusted to an appropriate value by applying an appropriate voltage to the MD pin from an
external circuit. If the MD pin is shorted to VCC, operation is locked in slow decay mode for this period, and if it is
shorted to ground, operation is locked in fast decay mode.
No.A0612-14/21
LV8743V
(5) Output current vector locus (one step is normalized to 90 degrees)
2-phase commutation position
Channel 1 phase current ratio
100.0
66.7
33.3
0.0
0.0
33.3
66.7
100.0
Channel 2 phase current ratio
(6) Current waveforms in the various commutation modes
2-phase commutation (Channels 1 and 2, CW mode)
I01,I11
H
PHA1
H
I02,I12
PHA2
(%)
IOUT1
100
0
(%) -100
100
IOUT2
0
-100
No.A0612-15/21
LV8743V
1-2 phase commutation (Channels 1 and 2, CW mode)
I01
I11
PHA1
I02
I12
PHA2
(%)
100
IOUT1
0
-100
(%)
100
0
IOUT2
-100
W1-2 phase commutation (Channels 1 and 2, CW mode)
I01
I11
PHA1
I02
I12
PHA2
(%)
100
IOUT1
0
-100
(%)
100
IOUT2
0
-100
No.A0612-16/21
Soft start setting pin
FB
NON
REGS
1.45µA
Constant
Current
2.5V
reference
voltage
SOFT INV
5V
2.5V
Internal
reference
voltage
1.55V
Error amplifier
5V
+
+
5V
VMSW
Maximum duty setting pin
+
-
0.96V
RT
5V
+
LVS
5V
Protection
circuit
5V
Timer/latch setting pin
High during
protection
circuit
operation
operation
Triangle wave
oscillator
CT
PWM comparator
5V
+
FB comparator
High during
5V
LVS
-
0.48V
Triangle
wave
DT
SCP
2.4µA
Constant
Current
5V
OUT
VM
REGOUT
LV8743V
Switching Regulator Controller
(1) Regulator block diagram
No.A0612-17/21
LV8743V
(2) Timing chart
Short circuit protection
circuit reference voltage
Oscillator triangle wave output (CT)
Maximum duty input voltage (DT)
Error amplifier output (FB)
1.53V
0.96V
0.48V
Regulator output (OUT)
Triangle wave conversion output
(1)
SCP pin waveform
(2)
1.7V
Short circuit protection
comparator output
Latch output
SOFT pin waveform
VMSW supply voltage
9.2V
No.A0612-18/21
LV8743V
(3) SOFT pin constant setting (Soft start setting)
The switching regulator's soft start operation is set by the value of the capacitor connected between the SOFT pin and
ground.
Use the following equation to determine the value of this capacitor.
Soft start time : Tsoft
Tsoft ≈ C × V/I [sec]
V : Error amplifier noninverting input voltage (NON3/NON4)
I : SOFT pin charge current 1.45µA, typical
(4). SCP pin constant setting (Timer/latch setting)
The time until the output is turned off when the regulator output is shorted is set with the value of the capacitor
connected between the SCP pin and ground.
Use the following equation to determine the value of this capacitor.
Timer/latch operating time : Tscp
Tscp ≈ C × V/I [sec]
V : Threshold voltage (1.7V, typical)
I : SCP pin charge current (2.4µA, typical)
(5) RT pin constant setting (Capacitor charge/discharge current setting)
The charge/discharge current for the capacitor connected to the CT pin used to generate the triangle wave is set with the
value of the resistor connected between the RT pin and ground.
Use the following equation to determine the value of this resistor.
Charge/discharge current : Irt
Irt ≈ V/R [A]
V : The R pin voltage (0.96V, typical)
(6) CT pin constant setting (Triangle wave oscillator frequency setting)
The triangle wave oscillator frequency can be set with the value of the capacitor connected between the CT pin and
ground. (Note that this setting operates in conjunction with the RT pin charge/discharge current setting.)
Use the following equation to determine the value of this capacitor.
Triangle wave oscillator frequency : Fosc
Fosc ≈ 1/{2×C×V/I} [Hz]
V : Triangle wave amplitude (0.48V, typical when Fosc = 10kHz)
* : Note that the amplitude increases with the frequency.
I : Capacitor charge/discharge current
(See item (5), RT pin constant setting.)
No.A0612-19/21
LV8743V
Application Circuit
30kΩ
1 CR2
GND 44
Logic input
680pF
2 PHA2
OUT4 43
3 I12
OUT3 42
4 IO2
VMSW 41
5 PS
INV4 40
6 PGND1
FB4 39
7 GND
DT4 38
8 OUT2B
9 RNF2
12 OUT1B
1Ω
13 RNF1
INV3 36
LV8743V
11 VMM
5.6kΩ
NON4 37
1Ω
10 OUT2A
8kΩ 17kΩ
5.6kΩ
FB3 35
DT3 34
8kΩ 17kΩ
5.6kΩ
NON3 33
SOFT 32
5.6kΩ
0.01µF
14 OUT1A
SCP 31
15 PGND2
CREG 30
2.2µF
10µF
24V
- +
0.1µF
16 VG
RT 29
17 VM
CT 28
39kΩ
330pF
5V
- +
0.1µF
1.5V
- +
18 CP2
VREGS 27
19 CP1
MD 26
20 VCC
PHA1 25
0.1µF
21 VREF1
I11 24
22 CR1
IO1 23
Logic input
10µF
0.1µF
0.1µF
680pF
30kΩ
No.A0612-20/21
LV8743V
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products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
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This catalog provides information as of February, 2007. Specifications and information herein are subject
to change without notice.
PS No.A0612-21/21