Ordering number : EN7894B
LB8649W
Monolithic Digital IC
Digital Camera Motor Driver
http://onsemi.com
Overview
The LB8649W integrates the actuator drivers required by digital cameras on a single chip.
Features
• Integrates the actuator drivers required by digital cameras on a single chip.
1. Shutter drive ("SH") /AE system constant current output stepping motor or two VCM drivers
2. Zoom system constant voltage output stepping motor or DC motor driver (forward/reverse/brake)
3. AF system constant voltage output stepping motor driver
• Zero standby mode current consumption (allows batteries to be connected directly)
• Four independent power supply systems (SH/AE, AF, zoom, and input logic systems)
• Low-voltage drive (allows operation from two NiMH batteries)
• Built-in thermal protection circuit
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Symbol
VB max
VCC max
Maximum input voltage
Conditions
Ratings
Unit
VB power supply
10.5
V
VCC power supply
10.5
V
10.5
V
VIN max
Maximum output voltage
VOUT max
Maximum output current
IO max
Per channel
Allowable power dissipation
Pd max
When mounted on a circuit board *1
10.5
V
600
mA
1.0
W
Operating temperature
Topr
-20 to +80
°C
Storage temperature
Tstg
-55 to +150
°C
*1 Specified circuit board : 76.1 × 114.3 × 1.6mm3, 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.
Semiconductor Components Industries, LLC, 2013
June, 2013
31407 TI PC B8-6247, B8-6569 No.7894-1/9
LB8649W
Allowable Operating Ranges at Ta = 25°C
Parameter
Supply voltage range
Symbol
VB1, 2, 3
Conditions
Ratings
*2
Unit
1.9 to 10
VCC
V
1.9 to 10
High-level input pin voltage
VINH
1.8 to 10
V
Low-level input pin voltage
VINL
−0.3 to 0.4
V
Constant voltage setting input
VOC
VC1, VC2
0.1 to VB
V
VOI
IAE, ISH
0.1 to 1.0
V
range
Constant current setting input
range
*2 There are no restraints on the relative magnitudes of the VB1, VB2, VDD, VCC, and VIN power supply system voltages.
Example 1 : VB1 = VB2 = VDD = 2.4V (battery power supply), VCC = 4V (stepped up power supply), VIN (CPU power supply) = 5V
Example 2 : VB1 = VB2 = 2.4V, VIN = 3.3 V, VDD = VCC = 5V
Electrical Characteristics at Ta = 25°C, VB = VCC = 2.4V, Rf = 1Ω
Parameter
Symbol
Ratings
Conditions
min
Standby mode current
ICC0
VB1 = VB2 = VCC = VDD = 8.0V *3
ICC1
IN1, IN2, IN3 or IN4 = High *3
consumption
Operating mode current
consumption
Reference voltage
Control pin input current
Thermal shutdown operating
typ
Unit
max
0.1
5.0
6
9
ICC2
IN5, IN6, IN7 or IN8 = High *3
14
19
ICC3
IN9, IN10, IN11 or IN12 = High *3
18
25
Vref1
Iref = -1mA, INHD = Low
0.95
1.0
1.05
Vref2
Iref = -1mA, INHD = High
0.64
0.67
0.70
IIN
TSD
μA
mA
V
60
90
μA
160
180
200
°C
VC1 = 0.30V
1.46
1.53
1.60
V
IO = 0.2A (High and low side total)
0.27
0.37
0.50
V
VC2 = 0.30V
1.46
1.53
1.60
V
IO = 0.2A (High and low side total)
0.27
0.37
0.50
V
VIN = 5.0V
Design guarantee *4
temperature
AF System Constant Voltage Stepping Motor Driver (OUT1, 2, 3, 4)
Output constant voltage 1
Output saturation voltage 1
VO1
VSAT1
Zoom System Constant Voltage Driver (OUT5, 6, 7, 8)
Output constant voltage 2
Output saturation voltage 2
VO2
VSAT2
SH/AE System Constant Current Driver (OUT9, 10, 11, 12)
Output constant current
Output saturation voltage 3
IO
VSAT3
Rf = 1Ω, ISH = 0.3V
271
285
302
mA
IO = 0.3A (High and low side total)
0.33
0.44
0.60
V
*3 : This is stipulated to be the sum of the current consumption for the VB1, VB2, VDD, and VCC lines.
*4 : The device characteristics are not tested at all temperatures. They are only tested at Ta = 25°C at shipment; the characteristics in the guaranteed
temperature range are design guarantees.
No.7894-2/9
LB8649W
Package Dimensions
unit : mm (typ)
3163B
Pd max – Ta
36
0.5
9.0
7.0
Allowable power dissipation, Pd max – W
1.2
25
24
7.0
9.0
37
48
13
1
12
0.5
0.15
0.18
Specified circuit board : 76.1×114.3×1.6mm3
glass epoxy board
1.0
0.8
0.6
0.56
0.4
0.2
0
– 20
(0.75)
0
20
40
60
80
100
(1.5)
0.1
1.7max
Ambient temperature, Ta – °C
SANYO : SQFP48(7X7)
(NC)
(NC)
IAE
ISH
VC2
VC1
VREF
VCC
VB1
(NC)
PGND
OUT1
Pin Assignment
48
47
46
45
44
43
42
41
40
39
38
37
IN1 1
36 OUT2
IN2 2
35 OUT3
IN3 3
34 OUT4
IN4 4
33 OUT9
IN5 5
32 RFG1
IN6 6
31 OUT10
LB8649W
IN7 7
30 OUT11
15
16
17
18
19
20
VCC
14
VDD
13
21
22
23
24
OUT8
25 OUT7
PGND
IN12 12
(NC)
26 OUT6
VB2
IN11 11
(NC)
27 OUT5
FC1
IN10 10
FC2
28 OUT12
(NC)
IN9 9
SGND
29 RFG2
INHD
IN8 8
Top view
ILB0159
Note : Both PGNDs must be connected.
VDD : Power supply for the input system, reference voltage, and logic blocks.
VCC : Power supply for the constant current control block and output blocks (OUT9, 10, 11, and 12)
VB1 : Power supply for the constant voltage control block and output blocks (OUT1, 2, 3, and 4)
VB2 : Power supply for the constant voltage control block and output blocks (OUT5, 6, 7, and 8)
No.7894-3/9
LB8649W
Truth Table
(1) AF system stepping motor constant voltage control
Input
Output
IN1
IN2
IN3
IN4
INHD
Low
Low
Low
Low
Low
High
Low
Low
Low
OUT1
Mode
OUT2
OUT3
OUT4
Vref
−
−
−
−
−
High
Low
−
−
Low
High
Low
High
Low
High
Low
High
Low
Low
High
Low
−
−
High
Low
Low
High
High
Low
Low
High
High
Low
Low
High
Low
Low
Low
High
−
−
Low
High
Low
High
Low
High
Low
High
Low
Low
Low
High
-
-
Low
High
High
Low
Low
High
High
Low
Low
High
High
High
*
*
−
−
*
*
High
High
−
−
*
*
*
*
Low
Standby
1-2 phase excitation
1.0V
Output off
Low
1.0V
High
0.67V
Notes
1.
"−" indicates the output off state.
2.
When the output is high, a level that is VC1 × 5.1 will be output.
(2) Zoom stepping motor constant voltage control, or DC motor drive
Input
Output
IN5
IN6
IN7
IN8
INHD
Low
OUT5
Mode
OUT6
OUT7
OUT8
Vref
−
Low
Low
Low
Low
−
−
−
−
High
Low
Low
Low
High
Low
−
−
High
Low
High
Low
High
Low
High
Low
Low
Low
High
Low
−
−
High
Low
Low
High
High
Low
Low
High
High
Low
Low
High
Low
Low
Low
High
−
−
Low
High
Low
High
Low
High
Low
High
Low
Low
Low
High
-
-
Low
High
High
Low
Low
High
High
Low
Low
High
High
High
*
*
High
High
*
*
High
High
High
High
*
*
*
*
Low
Standby
1-2 phase excitation
1.0V
Brake
Low
1.0V
High
0.67V
Notes
1.
"−" indicates the output off state, "*" indicates "Don't care".
2.
When the output is high, a level that is VC2 × 5.1 will be output.
No.7894-4/9
LB8649W
(3) SH/AE system VCM driver constant current control or stepping motor drive
Input
Output
IN9
IN10
IN11
IN12
INHD
OUT9
Mode
OUT10
OUT11
OUT12
Vref
ISH
−
−
−
−
Low
Low
Low
Low
−
−
High
Low
*
*
High
Low
Low
High
*
*
Low
High
*
*
High
Low
High
Low
*
*
Low
High
Low
High
High
Low
*
*
High
Low
Low
High
*
*
Low
High
*
*
High
Low
*
*
Low
High
Low
Low
Low
Low
Low
High
−
−
1.0V
Standby
SH & AE
Setting
voltage
state
High
Low
Low
High
−
−
Hold
0.67V
Discharged
Standby
Notes
1. "−" indicates the output off state, "*" indicates "Don't care".
2. OUT9 and OUT10 are for SH, and provide stable startup characteristics with fast charge and fast discharge circuits.
3. OUT10 and OUT11 are for AE.
4. In standby mode, the ISH pin voltage is discharged by an internal transistor and thus is set to 0V.
5. Furthermore, the ISH pin is also set to the discharged state when inputs are provided to IN1 through IN8. This is for startup
correction.
6. When INHD is low, the Vref voltage will be 1.0V, and when high, the Vref voltage will be 0.67V.
Notes on Application Design
(1) Constant current level setting (ISH, IAE, RFG1/2, and OUT9 to OUT12)
The constant current level for the OUT9/10 pair is set by the ISH input voltage and the resistor connected to RFG1. As
shown in the block diagram, the current is controlled so that the voltage generated across the current detection resistor
connected between RFG1 and ground and the ISH input voltage become equal. The output current can be determined
from the following equation.
(Output current between OUT9 and OUT10) = (ISH input voltage) ÷ (RFG1 resistance + 0.05Ω)
The 0.05Ω here is the shared impedance of the emitter of the output transistor that drives the constant current and the
constant current control amplifier's sensing line.
Similarly, the constant current level for the OUT11/12 pair is set by the IAE input voltage and the resistor connected to
RFG2.
Note that since the constant current control block is connected to PGND internally to the IC, if voltage is provided to
ISH and IAE through a voltage divider, the voltage divider resistor ground must be connected to PGND.
(2) Rapid charge and discharge circuits (FC1, OUT9, and OUT10)
The SH control block (OUT9/10) includes rapid charge and rapid discharge circuits to support burst (rapid sequential)
imaging.
Since this type of circuit is not included in the AE control block (OUT11/12), the OUT9/10 block must be used for
shutter drive.
No.7894-5/9
LB8649W
(3) Startup correction function (ISH, OUT9, and OUT10)
Startup correction coil current
When VCC is high (no ISH capacitor)
When VCC is low (no ISH capacitor)
Coil current
Startup correction coil current
ISH discharge
SH close operation
Startup correction is applied to the coil waveform by setting the ISH pin input voltage to a time constant larger than that
of the coil with an external RC circuit. This makes it possible to provide stable shutter operation even in the presence of
power supply fluctuations.
Note : For the ISH startup correction, the capacitance is determined by, in the state where the ISH capacitor is not
present, verifying the coil current startup waveform when VCC is at a reduced level and choosing a capacitance
such that the time constant is lower than that of this waveform.
Note, however, that in cases where, for example, the supply voltage is stabilized and a startup correction
function is not needed, this startup correction capacitor is not needed.
(4) Phase correction capacitor (FC1, FC2)
Consider values in the range 0.0015 to 0.033µF for the FC1/2 capacitors, and select values such that oscillation in the
output is not a problem. If a coil with a particularly high impedance is used, an adequate margin must be provided in the
capacitor value. Note that since the constant current control block is connected to PGND internally to the IC, the
ground sides of the FC1/2 capacitors must be connected to PGND.
Notes to determine the value of FC1 and FC2 capacitors
FC1 is the connection for the phase compensation capacitor for the OUT9/10 output constant current control circuit.
Similarly, FC2 is the connection for the OUT11/12 phase compensation capacitor.
To determine the value of these capacitors, observe the output waveform and select a value such that the output does
not oscillate.
The FC pin is connected in the IC circuit to the constant current control amplifier output blocs and the output transistor
is driven by the rise in the FC potential. Therefore, since the FC pin initial state influences the output drive timing,
before applying power to the shutter, this IC discharges (with the rapid discharge circuit) the FC pin to a certain fixed
potential internally and then when starting to apply power to the shutter, the IC charges (with the rapid charge circuit)
the FC pin to a fixed potential internally so that the FC pin state is always fixed when driving the shutter.
This stabilizes the input to output delay time.
However, if the capacitor value is made too large, the time required for the above circuit to charge and discharge that
capacitor will become longer and the input to output delay time fluctuations will become larger due to variations in the
capacitor value (due both to sample-to-sample variations and to temperature characteristics).
Another disadvantage of making this capacitor larger is that the coil current rising slope will become less steep.
Although the rising slope of the coil current is essentially determined by the inductance component of the coil, if the
capacitor is made larger and its time constant increases, the slope of the rise of the coil current will become dependent
on the capacitor value.
For the above reasons, especially if high-speed shutter drive is required, the value of the capacitor connected to the FC
pin should as small as possible as long as the output does not oscillate (the range roughly from 0.0015 to 0.033 µF).
No.7894-6/9
LB8649W
(5) Constant voltage control: oscillation stopping capacitors (OUT1 to OUT8)
If constant voltage control is used, capacitors must be connected across the outputs to stop oscillation. Consider values
in the range 0.01 to 0.1µF and select capacitor values such that oscillation in the output is not a problem. Note that if the
output is driven at saturation, these oscillator prevention capacitors are not required.
(6) Ground and power supply line capacitors (PGND, SGND, VCC, VB1, VB2, VDD)
Capacitors must be inserted between PGND (two locations) and SGND and each of the power supply pins. These
capacitors must be positioned as close as possible to the IC.
(7) Input pin equivalent circuits
IN1 to IN12, INHD pins
VC1, VC2 pins
Logic
1μA or less
IN pins
80kΩ
IAE pin
1μA or less
IAE pin
VC pins
ISH pin
1μA or less
ISH pin
Startup correction
control circuit
No.7894-7/9
Constant current
startup setting
capacitor
Logic block
Reference voltage
thermal protection
circuit
0.01 to 0.1μF
0.0015 to
0.033μF
Phase correction capacitor
Rapid charge/
discharge circuit
Constant current
output
0.01 to
0.1μF
Braking function
included
0.01 to 0.1μF
0.0015 to
0.033μF
Internal
impedance
Constant
voltage output
0.01 to 0.1μF
Oscillation stopping capacitor
LB8649W
Block Diagram
No.7894-8/9
LB8649W
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