SITI MD215 Vcm driver for mobile phone Datasheet

11-MD215
Version
Issue Date
File Name
Total Page
: A.001
: 2007-12-07
: SP-MD215-A.001.doc
: 10
VCM Driver for Mobile Phone
新竹市展業一路 9 號 7 樓之 1
SILICON TOUCH TECHNOLOGY INC.
9-4F-3, Prosperity Rd I, Science-Based Industrial Park
Hsinchu, Taiwan, R.O.C.
Tel:886-3-5727171
Fax:886-3-5727390
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
11-MD215
VCM Driver for Mobile Phone
General Specifications
The 11-MD215 is a 1ch voice coil motor driver which provides a controllable constant
current via external PWM input signal control. With miniature package, it is suitable for
reduced -space mounting in camera module application and other portable device.
Features and Benefits
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Low supply voltage operation
Low saturation voltage
Low operating current
Zero standby current
Low digital pin (PD) control voltage (i.e., VIH = 1.6V @ VDD = 2.8V)
Built-in a freewheeling diode
Constant current control
PWM input control with low input current
Ultra-small package (WLCSP, 0.79*1.19*0.5 mm)
SP-MD215-A.001
Version:A.001
Page:1
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Pin Assignment
Pin Assignment of WLCSP (0.79*1.19*0.5mm)
TOP View
Pin NO.
Pin Name
1
VDD
2
IN
3
OUT
Motor output pin
4
AGND
Analog ground
5
GND
6
PD
SP-MD215-A.001
Description
Power supply pin for controller.
Constant current setting pin
Controller ground
Power down. Asynchronous power down signal
Version:A.001
Page:2
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Absolute Maximum Ratings (Unless otherwise noted, TA= 25℃)
Characteristic
Symbol
Rating
Unit
Supply Voltage
VDD
5.5
V
Input Voltage
VIN
VDD+0.4
V
Maximum output current
IOUT
250
mA
Power Dissipation
PD
300
mW
Operating Temperature Range
TOPR
-40 ~ 125
°C
Storage Temperature Range
TSTG
-65 ~ 150
°C
Electrical Characteristic
(Unless otherwise noted, TA= 25℃ & VDD = 2.8V, VCM= 28.5 Ω, 460μ H )
Item
Sym.
Condition
Limit
Unit
Min.
Typ.
Max.
2.0
2.8
5.5
V
Whole circuits
Supply Voltage
VDD
Supply Current
ISTB
PD = L (Standby mode)
0.1
1
μA
( IDD )
IDD1
PD = H (Operation mode)
0.6
1
mA
Power down
Input Voltage ‘H’
VPDH
-
0.57*VDD
-
VDD+0.4
V
Input Voltage ‘L’
VPDL
-
-0.4
-
0.2*VDD
V
Input Current ‘H’
IPDH
-
10
20
μA
Input Current ‘L’
IPDL
-
-
±1
μA
-
-
200
mA
PD = L
-
-
1
μA
IOUT = 80 mA
-
0.3
0.35
V
20
50
μs
VPD = 2.8V(built-in pull low
resistor 300k)
VPD = 0 V
Constant Current Output Terminal
Output constant current
IOUT
Output current during
PD
IOUT,PD
Saturation Voltage
(VOUT->AGND)
VSAT
Output Current Settling
Time
ts
SP-MD215-A.001
VDD = 2.8V, CL=0.1 μ F ,
IOUT = 0 -> 100mA
Version:A.001
Page:3
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Block Diagram
IN
VDD
PD
1
6
Output
Driver
Level Shift &
Pre Driver
2
5
3
OUT
4
GND
AGND
Application Circuit
1.
PWM control
V PW M
D % × V PW M
SP-MD215-A.001
Version:A.001
Page:4
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Application Notes
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The 11-MD215 is constant current control for use in Auto-Focus. The range of
supply voltage of 11-MD215, VDD is from 2.0V to 5.5V. The 11-MD215 digital
control pin, PD, its input range is defined that logic “H” is from 0.57*VDD to
VDD+0.4V and logic “L” is from –0.4V to 0.2*VDD. So the digital PD pin is
suitable to be controlled by 1.8V ISP.
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The power down pin (PD) is the enable pin of 11-MD215, which logic high level
(PD = H) is for IC operation. On the other hand, its logic low level (PD = L) puts
the chip into standby mode for power saving. Internal pull low resistor, 300k,
prevents IC from abnormal operation when PD is open. Therefore, it is easy to
switch the working status by controlling PD pin, and it is recommended that keeps
PD at low level (PD = L) before operation to reach the maximum efficiency of
power saving, especially in the application of portable device.
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Constant current operation of 11-MD215 provides the current, which can be
evaluated by the formula I =
VIN
15
(A) .
It is convenient to get constant output
current by controlling input dc voltage, VIN. Therefore, by adjusting the resistance
of RA, RB, and the capacitance CIN, with appropriately PWM frequency will get the
suitable and stable input voltage level, VIN, for setting constant current in the
output.
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In the application circuit diagram, the signal PWM, VPWM, is filtered by a low pass
filter which consists of RA, RB, and CIN. The -3dB frequency ω3dB and VIN are
given by
ω3dB =
VIN =
1
( RA // RB ) CIN
RB
D% × VPWM
RA + RB
(1)
(V) ,
, which D% is the duty ratio of PWM frequency. The corresponding of constant
current at the output could be changed by setting different duty ratio of PWM, In
order to confirm the accuracy and stable value of constant current, the amount of
SP-MD215-A.001
Version:A.001
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SILICON TOUCH TECHNOLOGY INC.
-3dB frequency ω3dB is suggested lower than the 1/1000 of the PWM frequency. It
is shown as follows,
ω3dB =
z
1
ωPWM
1000
(2)
The following example explains how to design the low pass filter. For PWM
frequency f PWM = 92.8kHz , and desired maximum output constant current, I MAX , is
80mA and VPWM = 2.8V. Please determine CIN, RA and RB.
According to equation (1) & (2), we have
f3dB =
1
1
=
f PWM = 92.8 Hz
2π ( RA // RB ) CIN 1000
By choosing CIN = 0.1uF , we can get ( RA // RB ) = 17.1k Ω .
Owing to I MAX =
VIN , MAX
15
(A) =
RB
VDD ( A ) ,
15 ( RA + RB )
Then
RA = 40k Ω , RB = 30k Ω
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In order to ensure the stabilization of output current, the compensation
capacitance CL is suggested placing in parallel with VCM. The suggestion value
of CL is about 0.1~1uF and maybe fine tune depending on the different VCM. It is
the sense of frequency response compensation to confirm stability while VCM
operating.
SP-MD215-A.001
Version:A.001
Page:6
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
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LPF Design Look Up Table
1.
PWM = 24 KHz
VPWM = 2.8V
Max. output
current I (mA)
CIN ( μ F )
RA ( kΩ )
RB ( kΩ )
70
0.1
177
106
80
0.1
155
116
Max. output
current I (mA)
CIN ( μ F )
RA ( kΩ )
RB ( kΩ )
70
0.1
92
55
80
0.1
80
60
Max. output
current I (mA)
CIN ( μ F )
RA ( kΩ )
RB ( kΩ )
70
0.1
46
28
80
0.1
40
30
2.
PWM = 46 KHz
VPWM = 2.8V
3.
PWM = 92.8 KHz
VPWM = 2.8 V
SP-MD215-A.001
Version:A.001
Page:7
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Package Specifications (WLCSP)
(size: 0.79*1.19*0.5 mm)
E
A1
A
S
L1
D
e1
b
L2
e2
DIMENSION
(mm)
SYMBOL
A
A1
S
b
D
E
e1
e2
L1
L2
SP-MD215-A.001
MIN.
0.445
0.17
0.275
0.24
1.14
0.74
0.170
0.170
Version:A.001
NOM.
0.50
0.20
0.30
0.26
1.19
0.79
0.4
0.4
0.195
0.195
MAX.
0.555
0.23
0.325
0.28
1.24
0.84
0.220
0.220
Page:8
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
The products listed herein are designed for ordinary electronic applications, such as
electrical appliances, audio-visual equipment, communications devices and so on.
Hence, it is advisable that the devices should not be used in medical instruments,
surgical implants, aerospace machinery, nuclear power control systems,
disaster/crime-prevention equipment and the like. Misusing those products may
directly or indirectly endanger human life, or cause injury and property loss.
Silicon Touch Technology, Inc. will not take any responsibilities regarding the
misusage of the products mentioned above. Anyone who purchases any products
described herein with the above-mentioned intention or with such misused
applications should accept full responsibility and indemnify. Silicon Touch Technology,
Inc. and its distributors and all their officers and employees shall defend jointly and
severally against any and all claims and litigation and all damages, cost and
expenses associated with such intention and manipulation.
SP-MD215-A.001
Version:A.001
Page:9
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