LB1940T D

Ordering number : EN7232C
LB1940T
Monolithic Digital IC
2-ch H-Bridge Constant Current Driver
http://onsemi.com
Overview
The LB1940T is 2-phase exciter type bipolar stepper motor driver ICs that feature low-voltage, (supporting 3V
battery) and low current operation with low saturation voltage. This IC enable constant-current control of actuators,
and are optimal for driving the actuators of PC peripherals such as USB compatible scanners, FDDs, and printers, as
well as for controlling the shutter, iris, and AF of a digital still camera.
Features
Low-voltage driving
2-power source type:
VS = 1.6 to 7.5V, VDD = 1.9 to 6.5V
Single power source type: VS = VDD = 1.9 to 7.5V
Low saturation output:
VO(sat) = 0.3V at IO of 200mA
Constant-current control
Built-in reference voltage (Vref = 0.9V)
Small-sized, low-profile package (TSSOP20; 225mil; thickness (t) = 1.2mm max.)
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VB max
VS1, VS2, VDD
-0.3 to +10.5
V
Output applied voltage
VOUT max
OUT1, OUT2, OUT3, OUT4
-0.3 to +10.5
V
Output Current
IO max
Input applied voltage
VIN max
ENA1, ENA2, IN1, IN2, VC
-0.3 to +10.5
Allowable power dissipation
Pd max
Mounted on a specified board *
Operating temperature
Topr
-20 to +85
C
Storage temperature
Tstg
-55 to +150
C
400
800
mA
V
mW
* Mounted on a Specified board: 114.3mm76.1mm1.6mm, glass epoxy
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
ORDERING INFORMATION
See detailed ordering and shipping information on page 8 of this data sheet.
Semiconductor Components Industries, LLC, 2013
December, 2013
D2013HK/D0512HK 20080624-S00002/D2706 MSIM/93004JOIM No.7232-1/8
LB1940T
Allowable Operating Range at Ta = 25C
Ratings
Parameter
Function-guaranteed voltage range
Symbol
Conditions
min
typ
unit
max
VOPR1
VDD system, VS = 2.0V
1.9
6.5
VOPR2
VS system, VDD = 5.0V
1.6
7.5
V
Low level input threshold voltage
VIL
ENA1, ENA2, IN1, IN2
-0.3
1.0
V
High level input threshold voltage
VIH
ENA1, ENA2, IN1, IN2
2.0
6.0
V
VC input voltage
VC
0.19
1.0
V
Electrical Characteristics at Ta = 25C, VS = 3V, VDD = 5V
Ratings
Parameter
Standby current dissipation
Symbol
ISTB
Conditions
min
typ
VS = VDD = 6.5V
unit
max
0.1
1.0
0.95
A
Regulator output circuit
VREF output voltage
VREF
IOL = 0 to 1mA
0.85
0.9
SVDD output voltage
VSVDD
IOL = 10mA
4.70
4.85
V
VO(sat)1
VDD = 5.0V, VS = 2.0V
IO = 200mA (PNP side)
0.20
0.30
V
VO(sat)2
VDD = 5.0V, VS = 2.0V
IO = 200mA (NPN side)
0.10
0.15
V
IOUT1
VDD = 6.0V, VC = 0.2V, VS = 3.5V
RL = 5 (between OUT-OUT), RFB = 2
94
100
106
mA
180
200
220
mA
1.5
3
mA
4
7
mA
-1
A
100
A
V
H bridge output circuit
OUT output saturation voltage
(at saturation control)
OUT output current
(at constant current control)
IOUT2
VC =
Rb
Ra  Rb
VREF (Ra = 70k, Rb = 20k) *
VDD = 6.0V, VS = 2.0V
RL = 5 (between OUT-OUT), RFB = 1
VS system operating current
IS1
VC =
consumption
VDD system operating current
dissipation
IDD1
VC =
Rb
Ra  Rb
Rb
Ra  Rb
VREF (Ra = 70k, Rb = 20k) *
VREF (Ra = 70k, Rb = 20k) *
ENA1 = 2V
VC input current
IVC
VDD = 6.0V, VS = 2.0V, VC = 1.9V
IIH
VIH = 5.5V
0
Control input circuit
Control pin maximum input current
IIL
VIL = GND
80
-1
0
* For Ra and Rb, refer to Application Circuit Diagram.
No.7232-2/8
LB1940T
Package Dimensions
unit : mm (typ)
0.5
6.5
20
4.4
6.4
11
1
0.22
10
0.15
(1.0)
1.2max
0.65
0.08
(0.3)
SANYO : TSSOP20(225mil)
Pd max - Ta
Allowable Power Dissipation, Pd max - mW
1000
800
Mounted on a Specified board:
114.3mm76.1mm1.6mm glass epoxy
800mW
600
400
200
0 LB1940T/U
--20
0
20
40
60
Ambient Temperature, Ta- C
80
100
ILB01486
True Table
Input
Output
ENA
IN
1
2
L
L
H
1
OUT
2
3
4
SVDD
Mode
1
2
H
L
H
on
L
H
L
on
Forward rotation
Standby (current dissipation zero)
H
A blank means “don’t care”.
H
L
Reverse rotation
L
H
on
Reverse rotation
H
L
on
Forward rotation
A blank means “off”.
No.7232-3/8
LB1940T
Pin Assignment
VC1
1
20 VS1
S-GND
2
19 SVDD
VC2
3
18 V DD
Vref
4
17 OUT1
ENA1
5
16 RFG1
ENA2
6
15 OUT2
IN1
7
14 OUT3
IN2
8
13 RFG2
FC1
9
12 OUT4
LB1940T
FC2 10
11 VS2
Top view
Pin Description
Pin No.
Pin
LB1940T
Name
1
VC1
Pin No.
Pin
LB1940T
Name
11
VS2
GND for control system
12
OUT4
Motor drive output 4
Reference voltage input for 2ch
13
RFG2
Constant-current detection pin
Motor drive output 3
Description
Reference voltage input for 1ch
Description
Motor power supply (+)
control
2
S-GND
3
VC2
control
4
Vref
Reference voltage output
14
OUT3
5
ENA1
Signal input for 1ch control
15
OUT2
Motor drive output 2
6
ENA2
Signal input for 2ch control
16
RFG1
Constant-current detection pin 1
7
IN1
Signal input for 1ch control
17
OUT1
Motor drive output 1
8
IN2
Signal input for 2ch control
18
VDD
Control system power supply (+)
9
FC1
C connection pin for 1ch phase
19
SVDD
20
VS1
Control system power output
compensation
10
FC2
C connection pin for 2ch phase
Motor power supply (+)
compensation
No.7232-4/8
+
--
FC1
VS1
RFG1
OUT1
300
65k
65k
ENA2
VDD-SW
Reference voltage
logic circuit
VDD
IN1
65k
ENA1
OUT2
IN2
65k
S-GND
VC1
VREF
OUT3
SVDD
OUT4
RFG2
VS2
FC2
+
--
VC2
LB1940T
Block Diagram
300
80k
80k
80k
80k
No.7232-5/8
LB1940T
Application Circuit Diagram
VDD
VS2
VS1
ENA1
OUT1
ENA2
CPU
IN1
OUT2
LB1940T
OUT3
OUT4
IN2
S-GND
FC1
SVDD
FC2
Vref
Ra
VC1
VC2
RFG1
RfB
RFG2
RfB
Rb
At constant-current control: The OUT current is controlled so that the RFG pin voltage is equal to the VC input pin
voltage.
For example, IOUT = 200mA (= 0.2V/1) when VC = 0.2V and RFB = 1.
*: There is no priority relationship between respective input voltages (ENA, IN) and respective supply voltages
(VDD, VS). For example, operation with VIN = 5V, VDD = 3V, VS = 2V is possible.
Note: The input voltage range to the reference voltage input pin VC for constant-current setting is from 0.19V to
1.0V.
Constant current setting
The composition of the constant-control circuit of this IC is as shown
in the figure below.
The voltage entered in the VC pin is entered as a reference to the “+”
side input of the constant-current control amplifier.
The “-” side of this constant-current control amplifier is connected to
the RFG pin via the wire bonded resistor Rb (= 0.1).
The constant-current control circuit consists of comparison of the
voltage generated at the external current detection resistor with the
above reference voltage.
In addition, since the bias current Ib (= 1.5μA) flows out of the
positive (+) input of the constant current control amplifier during the
constant current control, if the voltage is input to the VC pin by
dividing the VREF voltage by 4.5 according to the dividing resistance
(70k and 20k) as shown in the figure, the formula for calculating
the VC voltage is as follows :
VC = VREF/4.5+Ib20k = VREF/4.5+0.03
Therefore, the theoretical equation to set the constant current IOUT is as follows:
IOUT = VC/(RFB+Rb) = (VREF/4.5+0.03)/(RFB+Rb)
No.7232-6/8
LB1940T
No.7232-7/8
LB1940T
ORDERING INFORMATION
Device
LB1940T-MPB-E
Package
TSSOP20(225mil)
(Pb-Free)
Shipping (Qty / Packing)
LB1940T-MPB-H
TSSOP20(225mil)
(Pb-Free / Halogen Free)
70 / Fan-Fold
LB1940T-TLM-H
TSSOP20(225mil)
(Pb-Free / Halogen Free)
2000 / Tape and Reel
70 / Fan-Fold
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PS No.7232-8/8