CALMIRCO CM9140

PRELIMINARY
CM9140
Four Output Driver for White LEDs
Features
Product Description
•
•
•
The CM9140 is an adaptive fractional switched capacitor (charge pump) regulator optimized for driving four
white LEDs. Each LED's driver current is matched to
within 2% for uniform intensity. It supports an input
voltage range of 2.9V to 6V, with undervoltage lockout.
A failure detection circuit prevents the loss of power
when one or more LEDs fail (short or open). Internal
over-temperature and over-current management provide short circuit protection.
•
•
•
•
•
•
•
•
•
•
•
•
•
2.9V to 6V input voltage range
Powers display backlight and/or flash WLED
Low external parts count, requires no inductor and
ballast resistors
Low EMI and reflected ripple
Adaptive charge pump ratio (1x or 1.5x) maximizes
efficiency at both high and low input voltage
Precision regulation for each output with 2% current matching at 20mA
Programmable LED current via ISET pin
Typical 500 KHz fixed switching frequency
Supports up to 300mA, drives four LEDs regulated
to 50mA each
Analog and PWM intensity control
Less than 10µA shutdown current
Over-current and over-temperature protection
Undervoltage lockout
Soft-start limits start-up inrush current
16 lead TQFN package
Optional RoHS compliant lead free package
The CM9140 regulates up to 300mA of output current
to drive WLEDs, allowing up to 50mA per LED channel.
The maximum LED current is programmed with an
external resistor. The EN input allows for Analog and
PWM brightness control. The CM9140 can also be
used for a camera flash. In full shutdown mode, the
CM9140 draws only 10µA.
The CM9140 automatically selects the most efficient
charge pump ratio based on the operating voltage
requirement of the white LEDs. The proprietary design
architecture maintains high efficiency (> 80%), and at
low VIN provides longer battery life. With a high VIN, or
when the adapter is powered, it provides cool reliable
operation.
Applications
•
•
•
•
Drives white LEDs for STN/TFT Color LCD backlighting
Cell phones, PDAs
Digital Still Cameras
Flash for DSC
The CM9140 is available in a compact, 16-lead TQFNpackage. It can operate over the industrial temperature
range of -40°C to 85°C.
Typical Application
1.0uF
1.0uF
C1P C1N
2.9V to 6.0V
off
C2N
VOUT
VIN
1uF
Enable
on
C2P
1uF
PhotonICTMLED1
CM9140
EN
ISET
RSET
LED2
LED3
GND
LED4
© 2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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1
PRELIMINARY
CM9140
Package Pinout
PACKAGE / PINOUT DIAGRAM
7 NC
8 C2N
11 C1N
14
13
12 LED4
C2P
1
LED3
2
LED1
10 GND
15
C1P
9 EN
TQFN16
4X4
16
3
LED2
4
VIN
VOUT
ISET
6 NC
5 NC
Bottom View
16-Lead TQFN Package
(4mm x 4mm)
Note: This drawing is not to scale.
Ordering Information
PART NUMBERING INFORMATION
Lead-free Finish
Leads
Package
Ordering Part Number1
16
TQFN
CM9140-01QE
Part Marking
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
±2
kV
[GND - 0.3] to +6.0
[GND - 0.3] to +7.0
[GND - 0.3] to +5.0
[GND - 0.3] to +5.0
V
V
V
Storage Temperature Range
-65 to +150
°C
Operating Temperature Range
-40 to +85
°C
300
°C
ESD Protection (HBM)
Pin Voltages
VIN to GND
VOUT to GND
ISET, EN to GND
All other pins to GND
Lead Temperature (Soldering, 10s)
© 2006 California Micro Devices Corp. All rights reserved.
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490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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04/26/06
PRELIMINARY
CM9140
Specifications (cont’d)
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V; All outputs are on. Typical values are at TA = 25°C.
SYMBOL
PARAMETER
CONDITIONS
MIN
1.7
VIN
Supply Voltage Range
VUVLO
Undervoltage Lockout
All outputs are no load.
IQ
Quiescent Current
1x mode
ISD
Shutdown Supply Current
VEN < 0.4V
MAX
6.0
UNIT
S
V
1.8
1.9
V
2.9
VOUT Charge Pump
Output Voltage
VOUT
ILED TOT
TYP
2
4.2
IOUT = 0mA to 120mA,
VIN = 3.0 to 5.5V
Σ ILED1 thru ILED4+photoflash
Total ILED Current
μA
500
10
μA
5.5
V
300
mA
ILED
Accuracy of ISET
VIN = 3.0V to 5.5V
1
Matching current between LED1
to LED4
ILED per driver
VIN = 4.0V, ILED 1,2,3,4 = 20mA
2
EN, ISET
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
Device total ILED < 200mA
%
5
%
50
mA
1.8
0.4
Protection
Over-current Limit
Over-temperature Limit
Over-temperature Hysteresis
400
135
15
mA
°C
°C
© 2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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3
PRELIMINARY
CM9140
Typical Performance Curves
Charge Pump Efficiency
Source Current
Vled=3.2V
90
80
Iout=120mA
Iout=30mA
70
Iout=60mA
60
3.0
Vled=3.2V
200
Input Current (mA)
Efficiency (%)
100
3.5
4.0
4.5
5.0
5.5
175
150
Iout=120mA
125
100
75
Iout=60mA
50
Iout=30mA
25
3.0
6.0
3.5
Input Voltage (V)
4.0
4.5
5.0
5.5
Input Voltage (V)
Typical Waveforms
Typical Waveforms
Cin=C2=C3=Cout=1uF, Iout=120mA
Cin=C2=C3=Cout=1uF, Iout=120mA
100 mV/
div
Vout
20mA/
div
Iin
50mV/
div
Vin
1.0x mode
6.0
100 mV/
div
Vout
20mA/
div
Iin
50mV/
div
Vin
1us/div
1.5x mode
1us/div
LED Current vs. Vin
Startup
Cin=C2=C3=Cout=1uF, Iout=120mA
ENB
200mA/
div
Iin
2V/
div
Vout
LED Current (mA)
2V/
div
25
20
15
10
5
3.0
.5ms/div
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
© 2006 California Micro Devices Corp. All rights reserved.
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490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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04/26/06
PRELIMINARY
CM9140
Functional Block Diagram
C1P C1N
C2P C2N
Charge Pump x1, x1.5
VIN
OSC
500 kHz
UVLO
VOUT
Bandgap
LED1
ISET
LED2
Mode Select
Current
Sinks
LED3
LED4
Failed LED
Condition
GND
CM9140
EN
Pin Descriptions
PIN DESCRIPTIONS
LEAD(s)
NAME
DESCRIPTION
1
LED1
Cathode of LED1 pin.
2
C1P
This pin is the plus side of charge pump bucket capacitor C1. Connect a 1.0μF
ceramic capacitor with a voltage rating of 10V or greater between C1N and C1P.
3
VIN
Positive supply voltage input pin. This voltage should be between 2.9V and 6V.
This pin requires a 1.0μF or larger ceramic capacitor to ground.
Enable pin and Current set pin for drivers, active low.
To set the LED current, a resistor, RSET, is connected between this pin and ground.
The regulated LED current is 1000x the current flowing in RSET, and is
4
ISET
approximately:
0.66V – ( LogicLow )
I LED = ----------------------------------------------------- × 1000
R SET
If this resistor is tied to directly ground (and enable function not used) Logic Low =
0, otherwise subtract the voltage drop of the device that drives this pin low.
© 2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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PRELIMINARY
CM9140
Pin Descriptions (cont’d)
PIN DESCRIPTIONS
5
NC
6
NC
7
NC
8
C2N
9
EN
10
GND
Ground terminal pin.
11
C1N
This pin is the minus side of charge pump bucket capacitor C1. Connect a 1.0μF
ceramic capacitor between C1N and C1P.
12
LED4
Cathode of LED4 pin.
13
C2P
This pin is the plus side of charge pump bucket capacitor C2. Connect a 1.0μF
ceramic capacitor between C2N and C2P.
14
LED3
Cathode of LED3 pin.
15
VOUT
Charge pump output voltage pin, which connects to the anodes of all LEDs. A 1μF
capacitor to ground is recommended.
16
LED2
Cathode of LED2 pin.
This pin is the minus side of charge pump bucket capacitor C2. Connect a 1.0μF
ceramic capacitor between C2N and C2P.
PWM/Analog input pin. Can be used as second Enable pin, active high. Should tied
high when not used.
Application Information
The CM9140 is a switched capacitor, charge pump
voltage converter ideally suited for driving white LEDs
to backlight LCD color displays in portable devices.
The CM9140 charge pump is the perfect driver for portable applications such as cellular phones, digital still
cameras, PDAs and any application where small
space, compact overall size, low system cost and minimal EMI are critical.
The CM9140 requires only two external switched
(bucket) capacitors, plus an input and an output capacitor, providing for a compact, low profile design. In
many applications, these can all be conveniently the
same value of 1.0µF, available in a compact 0805 surface mount package.
The adaptive conversion ratio selects the most efficient
operating mode. When VIN is higher than the needed
VOUT (VLED+VCURRENT_SINK), the 1x mode is set.
When the input voltage is below the LED forward voltage and a voltage boost is needed, the 1.5x mode is
automatically selected. The 1.5x mode uses a frac-
tional charge pump to convert the nominal Li-ion battery voltage (3.6V) by 1.5 times and regulates the LED
current to the low dropout current sources.
The current regulated sources maintain constant LED
drive in the presence of supply voltage fluctuations. All
LEDs are driven with the same current even when they
have slightly different forward voltages. The individual
current sources sense the current through each LED
and match this current to less than 2% for uniform
brightness across the color LCD display.
The CM9140 drives up to four WLEDS. The maximum
current programmed by RSET determines the maximum intensity; the display can be further dimmed by
PWM control applied to its EN pin.
CM9140 Operation
When a voltage is applied to the VIN pin, the CM9140
initiates a softstart cycle, typically lasting 100 µS. Softstart limits the inrush current while the output capaci-
© 2006 California Micro Devices Corp. All rights reserved.
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490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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PRELIMINARY
CM9140
Application Information (cont’d)
tors are charged. Following softstart, the CM9140 next
determines the best conversion ratio (1x or 1.5x).
The 1.5x mode employs a fractional charge pump. The
charge pump uses two phases from the internal oscillator to drive switches that are connected to the bucket
capacitors, C1 and C2, as shown in Figure 1. In the
first switch position, the bucket capacitors are connected in series and each are charged from VIN to a
voltage of VIN/2. The next phase changes the switch
positions so that C1 and C2 are in parallel, and places
them on top of VIN. The resulting voltage across COUT
is then VIN+1/2VIN = 1.5 x VIN.
VOUT
COUT
C1
VIN
C2
½ VIN
Charge C1 and C2 to ½ VIN each
A conventional charge pump with a fixed gain of 2x will
usually develop more voltage than is needed to drive
paralleled white LEDs from Li-Ion sources. This excessive gain develops a higher internal voltage, reducing
the system efficiency and increasing battery drain in
portable devices. A fractional charge pump with a gain
of 1.5x is better suited for driving white LEDs in these
applications.
At nominal loads, the switching losses and quiescent
current are negligible. If these losses are ignored for
simplicity, the efficiency, η, for an ideal 1.5x charge
pump can be expressed as the output power divided by
the input power:
VOUT
VIN
Efficiency
The CM9140 charge pump automatically switches
between the two conversion gains, 1x and 1.5x, allowing high efficiency levels over a wide operating input
voltage range. The 1x mode allows the voltage to pass
directly through to the output when sufficient input voltage is available. As the battery discharges to the point
where any one current source no longer has sufficient
voltage headroom to maintain a constant current regulation, the 1.5x charge pump is enabled.
½ VIN
C1
and will cause the output voltage to drop, until automatically resetting after removal of the excessive current.
Over-temperature protection disables the IC when the
junction is about 135 °C, and automatically turns on the
IC when the junction temperature drops by approximately 15 °C.
COUT
½ VIN
P LED
η = -----------P IN
For an ideal 1.5x charge pump, IIN 1.5 x IOUT, and the
efficiency may be expressed as;
C2
½ VIN
VOUT = ( VLED + VCURRENT _ SINK )
Transfer ½ VIN charge to top of VIN
PLED ⎛ ( VOUT ) × IOUT
≈ ⎜⎜
PIN
⎝ VIN × 1.5 × IOUT
Figure 1. Switch Operation
The CM9140 has over-temperature and over-current
protection circuitry to limit device stress and failure during short circuit conditions. An overcurrent condition
will limit the output current (approximately 400~600mA)
⎞
VOUT
⎟⎟ =
1
.
5 × VIN
⎠
For ( VLED + VCURRENT _ SINK ) = 3.9 V,
η≈
3.9 V
1.5 × VIN
© 2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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PRELIMINARY
CM9140
Application Information (cont’d)
Many charge pumps are fixed 2x designs. The ideal 2x
charge pump efficiency can be similarly expressed;
P OUT
3.9V ------------- ≈ ---------------------P IN
2.0 × V IN
In 1x mode, when the input voltage is above the output
voltage, the ideal efficiency is simply VOUT/VIN.
The typical conversion efficiency plots for these modes,
with some losses, are shown in Figure 2.
Efficiency (%)
1X
75
1X-1.5X
dual mode
1.5X
2X
30
3.0
3.5
4.0
4.5
If a LED is shorted, the CM9140 will continue to operate and drive the remaining LEDs at the programmed
current. If a LED opens, the other LEDs will still be regulated at the programmed current.
An external resistor programs a reference current, setting the maximum driver current. This resistor must be
tied to a good analog ground. If it is pulled to ground
through a switch, for example, from the host controller
output, the voltage drop across that switch should not
exceed 10mV.
90
45
Failed LED Detection
LED Current Set (ISET)
VLED=3.5V
60
The 1x mode has better efficiency than the 1.5x mode.
Selecting LEDs with low forward voltage (VLED)
increases the time spent in the 1x mode as the battery
discharges, extending the operating time.
5.0
5.5
6.0
The voltage at the ISET pin is provided by a .66V bandgap reference. The LED current is approximately
1000x the current set by the RSET resistor, according to
the following formula:
0.66V – ( LogicLow )
R SET = ----------------------------------------------------- × 1000
I LED
Input Voltage (V)
Figure 2. Ideal charge pump efficiency
As can be seen, the CM9140, with 1x and 1.5x modes,
has better efficiency in this application than a fixed 2x
charge pump. At low battery voltages, the higher efficiency of the CM9140 charge pump’s 1,5x gain
reduces the battery drain. At higher input voltages, typically seen when the system is running off an AC
adapter, the CM9140, operating the 1x mode, has better efficiency than single mode 1.5x or 2x charge
pumps, lowering the power dissipation for cooler circuit
operation and long life.
While the charge pump efficiency is easily determined,
the system efficiency is more difficult due to the current
source outputs, which complicate measuring the output
power. The forward voltage of the white LEDs will vary,
and the constant current sources will adjust to maintain
the current. When comparing systems, it is best to
compare the input current for a specified LED drive
current.
Logic Low is the voltage on device driving this pin to
ground. If the resistor is tied to ground directly, Logic
low = 0. For 20mA LED current, RSET≅33 k. When this
pin is driven high or open, the device will enter a sleep
mode with VOUT = 4.5V and, with no load,
IQUIESCENT≅ 500μA.
Analog Control of Display Intensity
Typically, portable devices control the backlight display
intensity in response to ambient light conditions, or
lower the intensity after a short standby interval to converse battery charge. The luminous intensity of white
LEDs is proportional to the amount of forward current
through them, but the color wavelength emitted is also
dependent upon the forward current. In applications
where color shift is not critical, brightness can be controlled by adjusting the diode’s current. A typical white
LED Intensity vs. forward current curve is shown in
Figure 3.
© 2006 California Micro Devices Corp. All rights reserved.
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PRELIMINARY
CM9140
Application Information (cont’d)
The resistors can be determined from the equations
below.
Relative Luminous Intensity
( R × Ratio ) + RpR = -----------------------------------------Ratio
Normalized to 20mA
1.5
Rset = Ratio × R
1.0
0.5
For example, a VC max of 2.5V and a maximum current
setting of 20mA, R=125k, RSET=44.8k. Figure 5 shows
the control curve.
0.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
LED Current vs. Vc
Forward Current (mA)
The ISET pins of the CM9140 can be used to connect
an analog DC signal for analog dimming of the white
LEDs, as shown in Figure 4 This requires an additional
resistor, R, and a DC source voltage, Vc.
LED Current (mA)
25
Figure 3. Typical Luminous Intensity vs.
LED Current
20
15
10
VC
5
0
CM9140
0.0
R
0.5
1.0
1.5
2.0
2.5
Control Voltage, Vc
ISET
Figure 5. LED Current Control Curve
RSET
Figure 4. Analog LED current adjust
A control voltage, VC, applied to the resistor divider will
decrease the current for all LEDs. The maximum LED
current occurs with 0V on VC, which is set by RP is the
parallel combination of R and RSET.
0.66V
R P = ----------------------- × 1000
I LED max
Choose the maximum control voltage, VC, which sets
zero LED current, and then determine the resistor ratio.
The circuit in Figure 6 is an example of logic dimming
control, which changes the LED forward current in discrete steps. The NMOS source is an open drain (or
open collector if bipolar) device, either the output of a
host controller, or a discrete device. Open drain, or
open collector devices sink current in their active, low
voltage state (logic 0), and are high impedance in their
high voltage, non-active state (logic 1). The open drain
must not be pulled high with an external resistor, but
instead connected only to the current setting resistors.
The parallel combination of R and RSET determine the
full intensity current. When the drain goes high, RSET
determines the lower intensity current.
0.66V Ratio = ------------------------Vc – 0.66 V
© 2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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PRELIMINARY
CM9140
Application Information (cont’d)
rent. Only the time averaged current changes. Above a
minimum frequency, the human eye will perceive the
change in duty cycle as a change in brightness.
CM9140
R
ISET
55k
82.5k
RSET
VBATT
Open Drain
Controller
Output
on
PWM
off
Figure 6. Logic Signal Dimming
RSET
.66 V * 1000
ILED (max)
R=
Rset =
.66 V * 1000
ILED (min)
1
1
1
−
Rp Rset
Additional parallel resistors can be added in the same
way.
PWM Control of Display Intensity
Typically, portable devices control the backlight display
intensity in response to ambient light conditions, or
lower the intensity after a short standby interval to converse battery charge. The CM9140 allows the output to
lower the LED brightness by applying a pulsing (PWM)
signal to EN, as shown in Figure 7. The waveforms are
shown in Figure 8.
The white in white LEDs is typically bichromatic, produced by a blue or UV LED that excites yellow phosphors. The two colors combine and the human eye
sees these them as white light. The forward current of
the LED influences the chromaticity, with higher LED
current increasing the blue content of the color.
VOUT
EN
LED1
LED2
LED3
LED4
ISET1
Display
CM9140
GND
For example, to reduce the luminosity intensity by half,
using the LED curve from Figure 3, the current setting
needs to be changed from 20mA to about 8mA. The
values in Figure 6 will accomplish this, are where
obtained using the following equations;
Rp =
VIN
Figure 7. PWM applied to EN
The recommended frequency is between 100 Hz and
200 Hz, with a duty cycle greater than 20%. If a frequency of less then 100 Hz is used, flicker might be
seen in the LEDs. The frequency should also be
greater than the refresh rate of the TFT display. Higher
frequencies will cause a loss of brightness control linearity. In addition, higher frequency can cause chromaticity shifts because the fixed rise and fall times of the
PWM signal will shift the forward current.
The PWM signal will cause the average LED current to
be reduced. The average current is determined by the
PWM duty cycle, which can vary from 0% to 100%.
Decreased Duty Cycle will linearly lower LED brightness, 0% Duty Cycle will turn off the display LEDs.
EN
PWM signal
VOUT
ILED (1,2,3)
Using a PWM signal allows the LEDs to be dimmed
without substantially shifting their color balance due to
chromaticity shifts related to changing white LED forward current. The PWM signal causes the LEDs to
operate either at the full ISET current, or at zero cur-
ISET
Figure 8. PWM Signal Dimming
© 2006 California Micro Devices Corp. All rights reserved.
04/26/06
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PRELIMINARY
CM9140
Application Information (cont’d)
CM9140 Design Examples
Capacitor Selection
Cell Phone
Some mobile phone LCD displays (both STN and miniTFT) use white LEDs for backlighting. Lightguides are
used to distribute the light uniformly behind the LCD. A
typical application is shown in Figure 9. The display’s
intensity can be lowered by a PWM signal applied to
the EN pin, as determine by the ambient light conditions.
VIN
off
PWM
VOUT
EN
LED1
LED2
LED3
LED4
ISET
Display
MENU
CM9140
R SET
GND
Figure 9. Display Backlight
Camera Flash
The CM9140 can support a camera flash in digital still
cameras as well as in camera equipped smart phones
and PDAs. In this case the flash LEDs are supplied 3 x
50-mA = 150-mA. See Figure 10.
VBATT
Flash
EN
ISET
RSET
LED1
LED2
LED3
LED4
For a given output current, increasing the output
capacitance reduces output ripple in the 1.5x mode.
Increasing the output capacitor will also increase startup current and time. In most LED applications, high
frequency output ripple is not a concern because it will
not cause intensity variations that are visible to the
human eye.
Layout Guide
VOUT
VIN
The capacitance and ESR of the external bucket
capacitors will directly affect the output impedance and
efficiency of the converter. A ceramic 1μF capacitor is
recommended.
Reflected input ripple depends on the impedance of
the VIN source, such as the PCB traces and the Li-ion
battery, which have elevated impedance at higher frequencies. The input capacitor located near the converter input reduces this source impedance and ripple.
Any ESR from the capacitor will result in steps and
spikes in the ripple waveform, and possibly produce
EMI. Much of the ripple voltage is due to moving current charge in and out of the capacitor and the capacitor’s impedance at the charge pump frequency. If ripple
voltage or current on the battery bus is an application
issue, add a small input inductor between the battery
and the capacitor, or just increase the capacitor.
VBATT
on
For proper performance, use surface-mount, low ESR
ceramic capacitors for all four positions. X7R or X5R
ceramic dielectric provides good stability over the operating temperature and voltage range.
The charge pump is rapidly charging and discharging
the external capacitors, so external traces to the
capacitors should be made wide and short to minimize
inductance and high frequency ringing. The four
capacitors should be located as close as practical to
the charge pump, particularly C1 and C2, which have
the highest dv/dt. Use a solid ground plane, and connect the ground side of CIN, COUT and the package
GND as close as practical.
WLED
Flash
CM9140
GND
Figure 10. Flash Application
© 2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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11
PRELIMINARY
CM9140
Mechanical Details
TQFN-16 Mechanical Specifications
Mechanical Package Diagrams
The CM9140 is supplied in a 16-lead, 4.0mm x 4.0mm
TQFN package. Dimensions are presented below.
For complete information on the TQFN16, see the California Micro Devices TQFN Package Information document.
D
Package
TQFN-16 (4x4)
Leads
16
Millimeters
Min
A
A1
A3
b
Nom
Max
0.80
0.84
0.00
0.04
Min
Nom
Max
0.031
0.033
0.15 C
0.002
0.15 C
0.00
0.20 REF
0.25
.008
0.33
0.010
D
4.0 BSC
0.157
1.95 REF
0.077
E
0.08 C
0.077
2.15
0.081
0.65 TYP.
0.55
0.085
0.157
1.95 REF
2.05
e
L
0.081
4.0 BSC
E1
E2
2.15
0.10 C
A3 A1
SIDE VIEW
0.085
A
0.026
0.65
0.022
# per
tube
xx pieces*
# per
tape and
reel
xxxx pieces
D1
0.026
E1
2.05
TOP VIEW
0.013
D1
D2
Pin 1 Marking
Inches
E2
Dim.
E
PACKAGE DIMENSIONS
Controlling dimension: millimeters
D2
* This is an approximate number which may vary.
L
DAP SIZE
1.8 X 1.8
b
e
16X
0.10
M
CAB
BOTTOM VIEW
Package Dimensions for 16-Lead TQFN
© 2006 California Micro Devices Corp. All rights reserved.
12 490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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04/26/06