LB1939T
2 Channel H Bridge Constant
Voltage/Constant Current Driver
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Overview
The LB1939T is a two-phase excitation bipolar stepping
motor driver that features low voltage operation, a low
saturation voltage, and low power consumption. It
supports constant voltage and constant current drive, can
control two iris motors, and is optimal for shutter, iris, and
AF drive in 3 V battery operated still digital cameras and
other battery operated equipment.
Package Dimensions
unit: mm
3246-TSSOP20
[LB1939T]
20
11
0.5
4.4
6.4
0.08
(1.0)
1.2max
0.15
6.5
Features
• Low-voltage drive
— Dual power supply operation: VS = 1.6 to 7.5 V,
V
DD
= 1.9 to 6.5 V
— Single power supply operation: VS = V
DD
= 1.9 to
7.5 V
• Low saturation voltage output: Vosat = 0.3 V at I
O
=
200 mA
• Supports constant voltage and constant current drive
• Built-in reference voltage circuit (Vref = 0.9 V)
• Miniature, thin form package (Thickness t = 1.1 mm)
0.65
(0.33)
1
0.22
10
TSSOP20
Specifications
Absolute Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Applied output voltage
Maximum output current: OUT1, 2, 3, and 4
Applied input voltage
Allowable power dissipation
Operating temperature
Storage temperature
3
Symbol
V
Bmax
V
OUT
I
Omax
V
IN
Pdmax
Topr
Tstg
VS1, VS2, V
DD
OUT1, 2, 3, 4
t
10 ms
ENA, IN, VC
Conditions
Ratings
–0.3 to +10.5
–0.3 to +10.5
400
10.5
0.8
–20 to +85
–55 to +150
Unit
V
V
mA
V
W
°C
°C
When mounted on a printed circuit board*
Note: Circuit board: 114.3
76.1
1.6 mm glass epoxy board
©
Semiconductor Components Industries, LLC, 2013
December 2013 - Rev. 0
1
Publication Order Number :
LB1939T/D
LB1939T
Allowable Operating Conditions
at Ta = 25°C
Parameter
Operation guaranteed voltage range 1
Operation guaranteed voltage range 2
Input low-level threshold voltage
Input high-level threshold voltage
Symbol
V
OPR
1
V
OPR
2
V
IL
V
IH
Conditions
V
DD
system, VS = 2.0 V
VS system, V
DD
= 5.0 V
ENA1, ENA2, IN1, IN2
ENA1, ENA2, IN1, IN2
Ratings
min
1.9
1.6
–0.3
2.0
typ
max
6.5
7.5
+1.0
6.0
Unit
V
V
V
V
Electrical Characteristics
at Ta = 25°C, VS = 3.0 V, V
DD
= 5.0 V
Parameter
Standby mode current drain
[Regulator Output Circuit]
V
REF
output voltage
SV
DD
output voltage
[H Bridge Output Circuit]
OUT pin output saturation voltage 1
(Saturation control mode)
OUT pin output saturation voltage 2
(Saturation control mode)
OUT pin output voltage 1
(Constant voltage control mode)
OUT pin output voltage 2
(Constant voltage control mode)
OUT pin output current 1
(Constant current control mode)
OUT pin output current 2
(Constant current control mode)
VS system operating current drain 1
VS system operating current drain 2
V
DD
system operating current drain 1
V
DD
system operating current drain 2
VC input voltage range
VC input current
[Control Input Circuit]
Control pin maximum input current
I
IH
I
IL
V
IH
= 5.5 V
V
IL
= GND
–1
70
100
0
µA
µA
Vosat1
Vosat2
V
OUT
1
V
OUT
2
I
OUT
1
I
OUT
2
I
S
1
I
S
2
I
DD
1
I
DD
2
VC
IVC
V
DD
= 6.0 V, VS = 2.0 V, VC = 5.0 V
V
DD
= 5.0 V, VC = SV
DD
, VS = 2.0 V
I
O
= 200 mA (PNP transistor side)
V
DD
= 5.0 V, VC = SV
DD
, VS = 2.0 V
I
O
= 200 mA (NPN transistor side)
V
DD
= 6.0 V, VC = 1.5 V, VS = 3.5 V
I
O
= 200 mA (PNP transistor side)
V
DD
= 6.0 V, VC = V
REF
, VS = 2.0 V
I
O
= 200 mA (PNP transistor side)
V
DD
= 6.0 V, VC = 0.9 V, VS = 3.5 V
RL = 5
Ω
(between OUT and OUT), RFB = 1
Ω
V
DD
= 6.0 V, VC = V
REF
, VS = 2.0 V
RL = 5
Ω
(between OUT and OUT), RFB = 1
Ω
VC = SV
DD
VC = VREF
VC = SV
DD
ENA1 = 2 V
VC = V
REF
ENA1 = 2 V
0.1
0
50
2.8
1.65
197
189
0.20
0.10
2.9
1.75
210
210
4
1.5
4
4
0.30
0.15
3.0
1.85
223
231
7
3
7
7
7
100
V
V
V
V
mA
mA
mA
mA
mA
mA
V
µA
V
REF
VSV
DD
I
OL
= 0 to 1 mA
I
OL
= 10 mA
0.85
4.7
0.9
4.8
0.95
V
V
Symbol
I
STB
VS = V
DD
= 6.5 V
Conditions
Ratings
min
typ
0.1
max
1.0
Unit
µA
Pd max — Ta
Allowable power dissipation, Pdmax — W
1
Mounted on a 114.3
×
76.1
×
1.6 mm
glass-epoxy printed circuit board
0.8
0.6
0.4
0.2
0
–20
0
20
40
60
80
100
Ambient temperature, Ta —
°C
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2
LB1939T
Truth Table
Input
ENA
1
L
H
2
L
H
L
H
H
L
L
H
H
L
L
H
H
L
on
on
on
on
1
IN
2
1
2
OUT
3
4
Output
SVDD
Mode
Standby mode (zero current drain)
Channel 1: reverse
Channel 1: forward
Channel 2: reverse
Channel 2: forward
Blank entries indicate “don’t care” states.
Blank entries indicate off states.
Pin Assignment
VC1
S-GND
1
2
20 VS1
19 SVDD
18 VDD
17 OUT1
16 RFG1
VC2
Vref
ENA1
3
4
5
LB1939T
ENA2
IN1
IN2
FC1
6
7
15 OUT2
14 OUT3
13 RFG2
12 OUT4
11 VS2
Top view
8
9
FC2 10
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3
Block Diagram
VC1
OUT2
VDD
OUT3
OUT4
VS2
VS1
OUT1
VC2
70kW
20kW
--
--
VDD-SW
--
--
+
+
--
LB1939T
--
65kW
65kW
65kW
80kW
80kW
S--GND
ENA2
FC1
RFG1
65kW
80kW
80kW
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Reference voltage
logic circuit
ENA1
IN1
IN2
VREF
SVDD
RFG2
FC2
20k
+
+
+
+
70k
4
LB1939T
Application Circuit Example 1
VDD
ENA1
ENA2
CPU
IN1
VS2
VS1
OUT1
OUT2
LB1939T
OUT3
OUT4
IN2
S-GND
SVDD
Vref VC1 VC2 RFG1 RFG2
Constant voltage control mode: OUT outputs a 1.75 V, which is Vref (0.9 V)
×
1.95.
*
: FC1 and FC2 are left open.
Application Circuit Example 2
VDD
ENA1
VS2
VS1
OUT1
ENA2
CPU
IN1
LB1939T
IN2
S-GND
SVDD
OUT2
OUT3
OUT4
FC1
FC2
Vref VC1 VC2 RFG1 RFG2
RFB
RFB
Constant current control mode: The RFG voltage is controlled so that Vref/4.5 = 0.2 V.
Therefore, when RfB is 1
Ω,
the circuit operates in constant current drive with Icoil = 0.2 V/1
Ω
= 200 mA.
*:
There are no magnitude constraints on the inputs (ENA, IN) and the supply voltages (V
DD
, V
S
).
For example, the IC can be operated at V
IN
= 5 V, V
DD
= 3 V, and V
S
= 2 V.
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