2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
1
CM9321
PRELIMINARY
Features
Integrated WLED and OLED driver
2.7V to 6V input voltage range
Up to 85% typical efficiency even for asymmetrical
channel loads in terms of LED number, LED current
and LED dropout
Excellent 5 series x 2 parallel WLED drive capability
(35 mA per channel)
OLED channel with up to 18V/30 mA capability
Independent current/voltage setting using external
low power resistors for each channel (no ballast resis-
tors)
No external frequency compensation needed
Low (<1%) LED output ripple voltage and current
Input undervoltage lockout and output over-voltage
protection
1 MHz fixed switching frequency (0.5 MHz option
available)
Uses small inductor and ceramic capacitors
Integrated 0.3
internal power switch
Disconnects LEDs during shutdown
Low profile TQFN-16 package
Optional RoHS compliant lead free packaing
Applications
Drives white LED backlighting and OLED
Cell phones
Digital Cameras
PDA, GPS, MP3 players
Handheld devices
Product Description
The CM9321 is a high frequency, three-channel inductor-
based PWM boost regulator specifically designed for con-
stant current white LED and constant voltage OLED drive
applications. With a maximum 19V/140mA output capabil-
ity, the circuit can drive up to 10 WLEDs (5 series x 2 par-
allel) and one OLED, allowing up to 35 mA per channel.
With an input voltage range from 2.7V to 6.0V, it can oper-
ate from a single cell Li-Ion battery.
The proprietary FlexBoost
TM architecture (patent pending)
provides high efficiency (typical 85%) for a wide input volt-
age range, even for asymmetrical channel loads in term of
LED number, LED current and LED type. A standard (non-
interleave) version is also available using a MODE selec-
tion pin (not availalbe fo mass production). The maximum
LED current and OLED voltage for each channel is inde-
pendently programmed with external low-power resistors
(no ballast resistors needed).
A 1 MHz constant frequency PWM saves board space,
allowing small, low-cost external components which per-
mits designers to avoid sensitive IF bands in RF applica-
tions. The output over-voltage protection circuit prevents
damage in the case of a high impedance output (e.g.
faulty LED). The controlled current limit circuit prevents
large inductor current spikes, even at start-up. To avoid
possible leakage currents the EN control pin disconnects
the LEDs from ground during shutdown.
The CM9321 is available in a compact TQFN-16 package.
It can operate over the industrial temperature range of -
40C to 85C.
2.7V to 6.0V
22K
V
IN
1
91K
3
22K
5
4
6
7
8
9
10
2
L1
D1
1 uF/16V
4.7 uH
1A/20V
10 uF/10V
V
OUT
C
OUT
12
11
R
SET 1
R
SET 3
R
SET 22
R
SET 21
OLED
CM9321
ISET1
GND
VSET2
IS
ET3
VOUT
SW
LE
D
2
LE
D
3
VI
N
LED1
EN
VREF
C
IN
Channel
CH1
CH3
CH2
20K
1 uF/6.3V
C
REF
MODE
NC
NC
NC
13
14
15
16
10 uF/16V
C
OLED
Enable
on (by default)
off
interlv (by default)
no-interlv
PhotonIC
TM
Typical Application
Asymmetrical High Efficiency Three Channel Boost LED/OLED Driver
2006 California Micro Devices Corp. All rights reserved.
2
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
04/26/06
CM9321
PRELIMINARY
Ordering Information
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
PACKAGE / PINOUT DIAGRAM
Note: This drawing is not to scale.
Bottom View
16-Lead TQFN Package
VSET2
VREF
LED1
ISET1
MODE
GND
SW
VOUT
NC
NC
NC
EN
LED
2
IS
E
T
3
LED
3
VIN
4
3
2
1
9
10
11
12
5
6
7
8
16
15
14
13
TQFN16
4 X4
(4mm x 4mm)
PART NUMBERING INFORMATION
Pins
Package
Lead-free Finish
Ordering Part Number
1
Part Marking
16
TQFN
CM9321-01DE
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
ESD Protection (HBM)
2
kV
VIN to GND
[GND - 0.3] to +6.0
V
Pin Voltages
V
OUT
, SW to GND
LED1, LED2, LED3 to GND
ISET1, VSET2, ISET3, VREF, EN to GND
20
20
[GND - 0.3] to +5.0
V
V
V
Storage Temperature Range
-65 to +150
C
Operating Temperature Range
-40 to +85
C
Lead Temperature (Soldering, 10s)
300
C
Package Pinout
2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
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Fax: 408.263.7846
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3
CM9321
PRELIMINARY
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
= 3.6V; C
IN
= 10
F, C
OUT
= 1
F, C
OLED
= 1
F, L
1
= 4.7
H, interleave mode, T
A
= 25C (unless otherwise specified)
V
IN
Input Voltage Range
2.7
6.0
V
I
Q
Quiescent Current
I
LED
< 0.6mA (each channel), non-
switching
1.2
2.0
mA
V
UVLO
Undervoltage Lockout
V
IN
Rising
2.0
2.2
2.4
V
V
OVP
Output Overvoltage Protec-
tion
V
OUT
Rising
19.0
19.5
20.0
V
I
SD
Shutdown Current
V
EN
= 0V
10
15
A
V
EN
Device Enable Threshold
Device ON (by default)
Device OFF
1.0
0.2
V
V
Channel 1 (WLED)
I
LED1
LED Current (Note 1)
V
IN
= 3.0V to 6.0V, R
SET1
(k
)
4 WLED
2
35
mA
Number of WLEDs (Note 2) V
IN
= 2.7V to 6.0V
1
5
V
LED1
Voltage on LED1 Pin
Standard load (Note 3)
0.80
V
Channel 2 (OLED)
V
OLED
OLED Voltage (Note 4)
V
IN
= 3.0V to 6.0V
8
18
V
I
OLED
OLED Current Range
V
IN
= 2.7V to 6.0V
2
30
mA
V
OLED
/ V
OLED
V
OLED
Regulation
V
IN
= 3.0V to 6.0V,
I
OLED
= 5mA to 20mA
5
%
V
OLEDacc
O
LED
Voltage Accuracy
1% divider resistors
3
%
V
REF
Reference Voltage
T
A
= 25C to 85C
1.180
1.220
1.260
V
I
REF
V
REF
Divider Current
(Recommended)
10
20
50
A
Channel 3 (WLED)
I
LED3
LED Current (Note 1)
V
IN
= 3.0V to 6.0V, R
SET1
(k
)
4 WLED
2
30
mA
Number of WLEDs (Note 2) V
IN
= 2.7V to 6.0V
1
5
V
LED3
Voltage on LED3 Pin
Standard load (Note 3)
0.80
V
Boost Circuit (Note 3)
I
LED
/ I
LED
V
IN
Line Regulation
V
IN
= 3.0V to 6.0V Each Channel
1
%/V
I
OUT
Boost Output Current
V
IN
= 3.0V to 6.0V
140
mA
V
OUT
Boost Output Voltage
Standard Load (Note 3)
V
IN
20
V
V
OUTR
Output Voltage Ripple
Standard Load (Note 3)
50
mVpp
D
Duty Cycle Range
V
IN
= 2.7V to 6.0V,
I
LED
= 2mA to I
LED MAX
5
95
%
R
DSON
MOSFET ON Resistance
I
SW
= 0.8A, V
GS
= 15V
300
500
m
450
R
SET1
---------------
20 V
VSET2
450
R
SET1
---------------
Specifications (cont'd)
2006 California Micro Devices Corp. All rights reserved.
4
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
CM9321
PRELIMINARY
Note 1: I
LED
is the average PWM current through the LED string with internal 2/3 duty cycle and a 6 ms period. The following for-
mula must be used to calculate the LED current:
Note 2: For lower LED forward voltage the number of LEDs can be increased up to the maximum output voltage limit.
Note 3: Standard Load is a 4 series x 2 parallel WLEDS configured for I
setLED
= 20 mA each channel (R
SET1
= R
SET3
= 22 k
) and
one OLED channel (CH2) which drives V
OLED
=12V and I
OLED
=20mA.
Note 4: V
VSET2
, the voltage on VSET2 pin should be maintained in the 0.4V - 1.0V range. The following formulae are related to
OLED channel settings:
,
,
Note 5: [ILED(set) - ILED(effective)]/ILED(set) for each channel.
Note 6: A ILED value below 0.6 mA for each channel set the circuit in no-load mode; all channels and MOSFET switch are in shut-
down and DC circuit current consumption is limited to 1 mA (see quiescent current).
Note 7: For non-interleave mode, all parameters have the same min/typ/max interleave mode values, unless otherwise specified.
Eff
Efficiency
Standard Load (Note 3)
85
%
I
SW
Switch Peak Current
Standard Load (Note 3)
0.65
A
P
IN
Input Power
I
LED 1,2
= 20mA,
4WLED+OLED+2W
950
mW
Control
I
LED acc
Channel Current Matching
(Note 5)
1% R
SET
Accuracy, Each Channel
3
%
I
LEDR
LED Current Ripple
Standard Load (Note 3)
0.2
mApp
I
LEDNL
No-Load Mode (Note 5)
All Channels
0
0.6
mA
fs
Switching Frequency
V
IN
= 2.7V to 6.0V
0.8
1.0
1.2
MHz
V
IN
= 3.6V; C
IN
= 10
F, C
OUT
= 1
F, C
OLED
= 1
F, L
1
= 4.7
H, non-interleave mode (Note 7), T
A
= 25C (unless otherwise
specified)
I
LED
LED Current
V
IN
= 3.0V to 6.0V, R
SET
(k
)
2
I
MAX
mA
P
IN
Input Power
I
LED 1,2,3
= 20mA,
4WLED+OLED+2W
990
mW
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
730
R
SET
-------------
ILED mA
(
)
450
RSET k
(
)
----------------------
=
V
OLED
V
OUT
V
LED
=
V
OLED
20 V
SET2
=
V
VSET2
R
SET22
R
SET21
R
SET22
+
------------------------------------------ V
REF
=
Specifications (cont'd)
2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
5
CM9321
PRELIMINARY
ILED vs. VIN
19.0
19.2
19.4
19.6
19.8
20.0
20.2
20.4
20.6
20.8
21.0
21.2
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VIN (V)
IL
E
D
(
m
A)
L = 4.7uH
4 WLED/ch
TA = 25 C
ILED3
ILED1
EFFICIENCY v.s VIN
75
80
85
90
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VIN (V)
E
f
f
i
cien
c
y
(
%
)
ILED1,2,3 = 20mA
L = 4.7uH
4 WLED/ch
EFFICIENCY vs. INDUCTOR
65
70
75
80
85
90
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VIN (V)
E
f
f
i
ci
en
c
y
(
%
)
VOLED = 10V
ILED1,3 = 20 mA
4 WLED/ch
TA = 25 C
L=4.7uH
L=3.3uH
L=2.7uH
L=1.5uH
L=10uH
L=15uH
EFFICIENCY vs. STRING CONFIGURATION
74
76
78
80
82
84
86
88
90
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VIN (V)
E
f
f
i
cien
c
y
(
%
)
L = 4.7uH
CH1,2,3 = 4W+OLED+2W
TA = 25 C
CH1,2,3=20mA+10V+20mA
CH1,2,3=5mA+10V+20mA
CH1,2,3=20mA+10V+5mA
VOLED vs. VIN
4
6
8
10
12
14
16
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
VIN (V)
VO
L
E
D
(
V
)
ILED1,3 = 20mA
CH1,2,3 = 4W+OLED+4W
COLED = 10uF
VOLED 12V
VOLED=8.5V
VOLED=10V
EFFICIENCY vs. ILED
60
65
70
75
80
85
90
0
5
10
15
20
25
30
35
ILED (m A)
E
f
f
i
cien
c
y
(
%
)
L = 4.7uH
4 WLED/ch
TA = 25 C
Vin=5.6V
4.2V
3.6V
3.0V
2.7V
Typical Performance Curves
2006 California Micro Devices Corp. All rights reserved.
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490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
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04/26/06
CM9321
PRELIMINARY
Pin Descriptions
CONTROL
VIN
CM9321
ISET1
ISET3
EN
SW
VOUT
LED3
LED2
LED1
VSET2
PMW
LOGIC
VREF
GND
ENABLE
OVP
Q1
Q3
Q2
Q4
D1
D2
D3
D4
OSC
BG
UVLO
BIAS
R
MODE
PIN DESCRIPTIONS
LEAD(s)
NAME
DESCRIPTION
1
ISET1
Channel 1 LED current set pin. Between this pin and GND connect the R
SET1
resistor, calculated as follows:
where I
LED1
is the DC LED current in channel 1.
2
LED1
Pin to cathode of channel 1 LED string.
3
VREF
Reference voltage output pin, used to bias VSET2 node.
4
VSET2
The voltage on this pin sets the VOLED as follows:
5
LED2
Pin to cathode of channel 2 LED string.
R
SET
1
k
(
)
450
I
LED
1
mA
(
)
-----------------------------
=
V
OLED
20 V
SET2
=
Functional Block Diagram
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
l
www.cmd.com
7
CM9321
PRELIMINARY
Application Information
The CM9321 is a high efficiency, constant frequency
current regulating boost driver ideally suited for driving
white LEDs to backlight LCD color displays and a cam-
era flash in Li-ion powered portable devices. The
CM9321 is the perfect driver for portable applications
such as cellular phones, digital still cameras, PDAs,
and any application where small space, compact over-
all size, and low system cost, are critical.
With a maximum 140mA/19V output capability, the cir-
cuit can drive up to 10 WLEDs (5 series x 2 parallel)
allowing up to 35mA per channel. It includes a switch
and an internally compensated loop for regulating the
current into the LEDs. The CM9321 delivers a constant
current to series-connected LEDs, ensuring uniform
brightness and color purity regardless of any LED for-
ward voltage variations.
The proprietary design architecture allows asymmetri-
cal loading on each channel and maintains high effi-
ciency (typ 85%) at low V
IN
resulting in longer battery
life, and cool, reliable operation when an adapter is
supplying high V
IN
. The maximum LED current for
each channel is independently programmed with exter-
nal low power resistors avoiding ballast resistors.
A 1MHz constant frequency PWM scheme saves
board space using of small, low cost external compo-
nents , allowing designers to avoid sensitive IF bands
in RF applications. The circuit operates with low value
inductor and low value output ceramic capacitor keep-
ing voltage and current ripple in the 1% range.
The output over-voltage protection circuit prevents
damage in the case of a high impedance output (e.g.
faulty LED). The controlled current limit circuit limit pre-
vents large inductor current spikes, even at start-up. To
avoid possible leakage currents the EN control pin dis-
connects the LEDs from ground during shutdown.
6
ISET3
Channel 3 LED current set pin. Between this pin and GND connect the R
SET3
resistor, calculated as follows:
where I
LED3
is the DC LED current in channel 3.
7
LED3
Pin to cathode of channel 3 LED string.
8
VIN
Input supply voltage pin. Bypass with a 10
F or larger ceramic capacitor to ground.
9
MODE
When MODE is HIGH (default), the circuit uses interleave mode. When MODE is
LOW (GND), the circuit uses non-interleave mode.
10
GND
Ground terminal pin.
11
SW
Switching node. Internally connected to the drain of the integrated switch.
12
VOUT
Output voltage pin, which connects to the anodes of all LEDs. Bypass with a 1.0
F
or greater ceramic capacitor to ground for low output ripple voltage.
13
EN
Enable pin. The circuit is ON when V
EN
is above 1.0V. The circuit is OFF when V
EN
is below 0.2V. Active High (ON) by default.
14
NC
Not internally connected. For better heat flow, connect to GND.
15
NC
Not internally connected. For better heat flow, connect to GND.
16
NC
Not internally connected. For better heat flow, connect to GND.
EPad
GND
Ground; backside exposed pad.
PIN DESCRIPTIONS
R
SET
3
k
(
)
450
I
LED
3
mA
(
)
-----------------------------
=
Pin Descriptions (cont'd)
2006 California Micro Devices Corp. All rights reserved.
8
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
04/26/06
CM9321
PRELIMINARY
CM9321 Operation
When a voltage that exceeds the undervoltage lockout
threshold (UVLO) is applied to the VIN pin, the
CM9321 initiates a softstart which limits the inrush cur-
rent while the output capacitors are charged. Following
softstart, the CM9321's internal NMOS drives an exter-
nal inductor and Schottky diode to deliver the inductor's
stored energy to the load.
Setting the LED Current
The output currents for channel 1 (up to 40mA) and
channel 3 (up to 30 mA) are set by the value of their
R
SET
resistor, located between the ISET(1,3) pin and
GND, according to the equations:
(a) Interleave
(b) Non-interleave
Setting the OLED Voltage
The output voltage for the OLED is the difference
between V
OUT
the voltage at I
LED3
pin. The voltage is
programmed using the voltage divider R22 and R21,
according to the equation:
PWM Brightness Control
The brightness WLEDs level can be continuously con-
trolled for each channel using a PWM signal in 1-50
KHz range (recommended value is 10 kHz). As an
example the PWM signal can be applied directly
through R
SET
resistor for negative slope or by using a
switch transistor for positive slope. See
Figure 1
for dif-
ferent brightness control methods and results.
Figure 1. Brightness Control Using
Different Methods
Inductor Selection
The inductor is used to store energy in a boost con-
verter. The amount of energy stored in the inductor and
transferred to the load is controlled by the PWM. The
inductor is operated in the discontinuous conduction
mode, and to assume proper operation, the inductor
value must be limited to a maximum value.
An inductor with low series resistance (DCR)
decreases power losses and increases efficiency. The
core material should be capable of operating at I MHz
with minimum core losses. An inductance of 4.7-H is
optimal for most applications, but low DCR inductor val-
ues in 1.5-15uH range are also recommended for high
efficiency applications.
To ensure proper operation of the current regulator
over a wide range of conditions, the inductor should be
selected based on the required load power and the
minimum input voltage. The saturation current rating
R
SET
k
(
)
450
I
LED
mA
(
)
--------------------------
=
R
SET
k
(
)
730
I
LED
mA
(
)
--------------------------
=
V
OLED
20 V
SET2
=
CM9321
ISET1
VSET2
PWM
signal
ISET3
22k
R
SET1
91k
R
SET3
(a) Schematic
0
5
10
15
20
25
0
10
20
30
40
50
60
70
80
90
100
DUTY (%)
IL
E
D
(
m
A
)
ILED1
negative slope
ILED3
positive slope
(b) Brightness curves
Application Information (cont'd)
2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
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l
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9
CM9321
PRELIMINARY
should be chosen well above the steady state peak
inductor current. At minimum Vin and full duty cycle
(worse case), this is approximately:
Diode Selection
The low forward voltage and fast switching time make
Schottky diodes the choice for high efficiency opera-
tion. Make sure the diode has a reverse voltage rating
greater than the maximum output voltage. The diode
conducts only when the power switch is on, so a peak
current rating above 1A should be sufficient for a typi-
cal design.
Capacitor Selection
For proper performance, use surface-mount, low ESR
ceramic capacitors for C
IN
and C
OUT
. X7R or X5R
ceramic dielectric provides good stability over the oper-
ating temperature and voltage range.
In most LED applications, high frequency output ripple
is not a concern because it will not cause intensity vari-
ations that are visible to the human eye.
For such applications, when low ripple is needed, a
22
F input capacitor and/or 2.2 F output capacitor are
recommended.
Input Filter
If CM9321 is more than 4" from main power supply
point, use an input RC filter to avoid high ripple and
input transients to the circuit input pin (see
Figure 2
).
In this case, because of small input ripple, the effi-
ciency is about 2% higher.
Figure 2. Input Filter Solution
Mode Selection
Two working modes are available for CM9321: inter-
leave mode (output voltage is periodically adjusted
depending on each channel load) and non-interleave
mode (same output voltage level for all channels). For
interleave option, keep MODE pin floating (HIGH by
default) and for non-interleave option, connect MODE
pin to GND.
Layout Guide
Components should be placed as close as practical to
the IC to assure good performance. The input and out-
put capacitors should be close, with minimum trace
resistance and inductance. Reflected input ripple
depends on the impedance of the VIN source, such as
the PCB traces and the Li-ion battery, which has ele-
vated 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.
Route any noise sensitive traces away from the switch-
ing power components. Place the inductor and diode
as close as possible to the SW pin to prevent noise
emissions.
The ground connections for RSET(1,21,22,3) resistors
should be kept separate from the high power grounds
and connect directly to the ground pin to assure accu-
rate current and voltage settings. For better heat flow,
connect all NC pins to GND plane. Also connect the
REF
DES
DESCRIPTION
SOURCE
C
IN
Capacitor, 10
F,
10V, Ceramic, 1206
Murata, GRM319R61A106KE19D
Vishay, VJ1206G106KXQ
C
OUT
Capacitor, 1
F, 16V,
Ceramic, 0805
Murata, GRM188R61C105KA93D
TDK, C2012X5R1C105K
L
1
Inductor, 4.7
H, 1A,
Low DCR
Coilcraft, LP06013-472ML
TMP Electronics Co., SPC-03802-4R7
CHILISIN, SCD03015-4R7
SUMIDA, CDH3D13/S4R7
D
1
Schottky Diode, 1A,
20V, SMD
IR, MBRS120
CHENMKO, SSM5817S
I
PEAK
V
IN MIN
(
)
t
ON
L
---------------------------------------
3V 0.95
1
1MHz
----------------
4.7
H
----------------------------------------------- 0.7A
GND
LED
3
VIN
9
10
MODE
7
8
V
IN
to
CM9321
interlv (by default)
non-interlv
C
F
0.1 uF/10V
R
F
100
Application Information (cont'd)
2006 California Micro Devices Corp. All rights reserved.
10
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
04/26/06
CM9321
PRELIMINARY
thermal landing to the bottom ground plane with ther-
mal vias.
Figure 3. Example CM9321 PC Layout and
Component Placement for Standard Application
Application Information (cont'd)
2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
11
CM9321
PRELIMINARY
TQFN-16 Mechanical Specifications
The CM9321 is supplied in a 16-lead, 4.0mm x 4.0mm
QFN package. Dimensions are presented below.
For complete information on the QFN16, see the Cali-
fornia Micro Devices QFN Package Information docu-
ment.
* This is an approximate number which may vary.
Package Dimensions for 16-Lead TQFN
PACKAGE DIMENSIONS
Package
QFN-16 (4x4)
Leads
16
Dim.
Millimeters
Inches
Min
Nom
Max
Min
Nom
Max
A
0.80
0.84
0.031
0.033
A1
0.00
0.04
0.00
0.002
A3
0.20 REF
.008
b
0.25
0.33
0.010
0.013
D
4.0 BSC
0.157
D1
1.95 REF
0.077
D2
2.05
2.15
0.081
0.085
E
4.0 BSC
0.157
E1
1.95 REF
0.077
E2
2.05
2.15
0.081
0.085
e
0.65 TYP.
0.026
L
0.55
0.65
0.022
0.026
# per
tube
xx
pieces*
# per
tape and
reel
xxxx pieces
Controlling dimension: millimeters
A3 A1
0.10 C
0.08 C
A
SIDE VIEW
Mechanical Package Diagrams
D
E
0.15 C
0.15 C
BOTTOM VIEW
TOP VIEW
e
b
L
0.10
C A B
M
16X
D2
E2
DAP SIZE
1.8 X 1.8
E1
D1
Pin 1 Marking
Mechanical Details
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