PRELIMINARY
CM9330
Asymmetrical High Efficiency Three Channel Boost LED Driver
Features
•
•
2.7V to 6V input voltage range
Up to 85% typical efficiency even for asymmetrical
channel loads in terms of LED number, LED cur-
rent and LED dropout
Excellent 5 series x 3 parallel WLED drive capabil-
ity
Up to 140 mA/19V output current/voltage
Independent current setting using an external low
power resistor for each channel (no ballast resis-
tors)
No external frequency compensation needed
Low (<1%) LED output voltage and current ripple
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 low ON-Resistance (0.3
Ω)
N-Channel
MOSFET switch
Disconnects LEDs during shutdown
Low profile TQFN-16 package
Optional RoHS compliant lead-free packaging
Product Description
The CM9330 is a high frequency, three-channel induc-
tor-based PWM boost regulator specifically designed
for constant current white LED drive applications. With
a maximum 140mA/19V output capability, the circuit
can drive up to 15 WLEDs (5 series x 3 parallel) allow-
ing up to 35 mA per channel. With a typical input volt-
age range from 2.7V to 6.0V, it can be operated from a
single cell Li-Ion battery.
The proprietary
FlexBoost
™
architecture (patent pend-
ing) provides high efficiency (typical 85%) for a wide
input voltage range, even for asymmetrical channel
loads in terms of LED number, LED current and LED
type. A standard (non-interleave) version is also avail-
able using a MODE selection pin (not available for
mass production). The maximum LED current for each
channel is independently 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, and per-
mitting designers to avoid sensitive IF bands in RF
applications. The output over-voltage protection circuit
prevents damage in the case of a high impedance out-
put (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 CM9330 is available in a compact TQFN-16 pack-
ages. It can operate over the industrial temperature
range of -40°C to 85°C.
•
•
•
•
•
•
•
•
•
•
•
•
Applications
•
•
•
•
•
•
•
Drives white LEDs for backlighting color LCD
Cell phones
MP3 players
PDA, GPS
Digital Still Cameras
LED flashlights
Handheld devices
Typical Application
V
IN
2.7V to 6.0V
C
IN
10 uF/10V
off
on (by default)
L1
4.7 uH
D1
1A, 20V
V
OUT
C
OUT
1 uF/16V
Enable
16
R
SET1
22K
2
3
R
SET2
22K
4
LED1
NC
ISET2
NC
15
NC
14
NC
13
12
11
10
9
interlv ( by default)
no-interlv
1
ISET1
CH1
Channel
CH2 CH3
PhotonIC
TM
CM9330
EN
VOUT
SW
GND
MODE
ISET3
LED2
LED3
7
R
SET3
22K
5
6
©
2006 California Micro Devices Corp. All rights reserved.
04/26/06
VIN
8
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
1
PRELIMINARY
CM9330
Package Pinout
PACKAGE / PINOUT DIAGRAM
Bottom View
6 ISET3
5 LED2
7 LED3
8 VIN
ISET2
MODE
LED1
ISET1
4
3
2
1
16
15
14
13
9 NC
TQFN16
4 X4
10 GND
11 SW
12 VOUT
NC
NC
16-Lead TQFN Package
(4mm x 4mm)
Note: This drawing is not to scale.
Ordering Information
PART NUMBERING INFORMATION
Lead Free Finish
Pins
16
Package
TQFN
Ordering Part Number
1
CM9330-01QE
Part Marking
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
ESD Protection (HBM)
VIN to GND
Pin Voltages
V
OUT
, SW to GND
LED1, LED2, LED3 to GND
ISET1, ISET2, ISET3 to GND
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering, 10s)
RATING
±
2
[GND - 0.3] to +6.0
20
20
[GND - 0.3] to +5.0
-65 to +150
-40 to +85
300
UNITS
kV
V
V
V
V
°C
°C
°C
©
2006 California Micro Devices Corp. All rights reserved.
2
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
NC
EN
l
Fax: 408.263.7846
l
www.cmd.com
04/26/06
PRELIMINARY
CM9330
Specifications (cont’d)
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
V
IN
= 3.6V; C
IN
= 10μF, C
OUT
= 1μF, L
1
= 4.7μH,
interleave mode,
T
A
= 25°C (unless otherwise specified)
SYMBOL
V
IN
I
Q
V
UVLO
V
OVP
I
SD
V
EN
Channel 1
I
LED1
PARAMETER
Input Voltage Range
Quiescent Current
Undervoltage Lockout
Output Overvoltage Protection
Shutdown Current
Device Enable Threshold
I
LED
< 0.6mA (each channel), non-
switching
V
IN
Rising
V
OUT
Rising
V
EN
= 0V
Device ON (by default)
Device OFF
V
IN
= 3.0V to 6.0V, R
SET1
(kΩ)
4 WLED
V
IN
= 2.7V to 6.0V
Standard load (Note 3)
V
IN
= 3.0V to 6.0V, R
SET2
(kΩ)
4 WLED
V
IN
= 2.7V to 6.0V
Standard load (Note 3)
V
IN
= 3.0V to 6.0V, R
SET3
(kΩ)
4 WLED
V
IN
= 2.7V to 6.0V
Standard load (Note 3)
V
IN
= 3.0V to 6.0V Each Channel
V
IN
= 3.0V to 6.0V
I
LED 1,2,3
= 2mA to I
LED MAX
V
IN
= 2.7V to 6.0V,
I
LED 1,2,3
= 2mA to I
LED MAX
Standard Load (Note 3)
I
SW
= 0.8A, V
GS
= 15V
Standard Load (Note 3)
Standard Load (Note 3)
I
LED 1,2,3
= 20mA, 4WLED+1W+1W
1% R
SET
Accuracy, Each Channel
100
V
IN
5
50
300
85
0.65
835
3
500
20
95
2
1
0.80
1
2
1
0.80
450
---------------
R
SET3
30
5
V
%/V
mA
V
%
mVpp
mΩ
%
A
mW
%
1.0
0.2
2
1
0.80
450
---------------
R
SET2
30
5
V
mA
450
---------------
R
SET1
35
5
V
mA
CONDITIONS
MIN
2.7
1.2
2.0
19.0
2.2
19.5
10
TYP
MAX
6.0
2.0
2.4
20.0
15
UNIT
S
V
mA
V
V
μA
V
V
mA
LED Current (Note 1)
Number of LEDs (Note 2)
V
LED1
Channel 2
I
LED2
Voltage on LED1 Pin
LED Current (Note 1)
Number of LEDs (Note 2)
V
LED2
Channel 3
I
LED3
Voltage on LED2 Pin
LED Current (Note 1)
Number of LEDs (Note 2)
V
LED3
Voltage on LED3 Pin
Boost Circuit
(Note 3)
ΔI
LED
/ I
LED
⋅ ΔV
IN
Line Regulation
I
OUT
V
OUT
D
V
OUTR
R
DSON
Eff
I
SW
P
IN
Control
I
LED acc
Boost Output Current
Boost Output Voltage
Duty Cycle Range
Output Voltage Ripple
MOSFET ON Resistance
Efficiency
Switch Peak Current
Input Power
Channel Current Matching
(Note 4)
©
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
3
PRELIMINARY
CM9330
Specifications (cont’d)
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
V
IN
= 3.6V; C
IN
= 10μF, C
OUT
= 1μF, L
1
= 4.7μH,
interleave mode,
T
A
= 25°C (unless otherwise specified)
SYMBOL
I
LEDR
I
LEDNL
fs
PARAMETER
LED Current Ripple
No-Load Mode (Note 5)
Switching Frequency
CONDITIONS
Standard Load (Note 3)
All Channels
V
IN
= 2.7V to 6.0V
0
0.8
1.0
MIN
TYP
0.2
0.6
1.2
MAX
UNIT
S
mApp
mA
MHz
UNIT
S
mA
%/V
%/V
mW
V
IN
= 3.6V; C
IN
= 10μF, C
OUT
= 1μF, L
1
= 4.7μH,
non-interleave mode
(Note 6), T
A
= 25°C (unless otherwise specified)
SYMBOL
I
LED
PARAMETER
LED Current
Line Regulation @ High Load
CONDITIONS
V
IN
= 3.0V to 6.0V, R
SET
(kΩ)
L = 4.7μH, V
IN
= 3.0V to 5.5V
4W+4W+4W, 40mA+40mA+40mA
L = 10μH, VIN = 3.0V to 5.5V
4W+4W+4W, 60mA+40mA+40mA\
I
LED 1,2,3
= 20mA, 4WLED+1W+1W
I LED
(
mA
)
450
= ---------------------
-
R
MIN
2
TYP
730-
------------
R
SET
1
3
975
MAX
I
MAX
Δ
I
LED
/
Δ
V
IN
P
IN
Input Power
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:
SET
(
kΩ
)
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 3 parallel configuration set for I
setLED
= 20 mA each channel (R
SET1,2,3
= 22 kΩ).
Generally, a "4W+1W+1W" like formula denotes the WLED number of each channel, i.e. CH1+CH2+CH3 configurations.
Note 4: [I
LED
(set) - I
LED
(effective)] / I
LED
(set) for each channel.
Note 5: A LED current value below 0.6 mA for each channel set the circuit in No-load mode; all channels and MOSFET switch are in
shutdown and DC circuit current consumption is limited to 1 mA (see quiescent current).
Note 6: For non-interleave mode, all parameters have the same min/typ/max interleave mode values, unless otherwise specified.
©
2006 California Micro Devices Corp. All rights reserved.
4
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
PRELIMINARY
CM9330
Typical Performance Curves
ILED vs. VIN
21
.2
21
.0
1
60
1
50
ILED vs. VIN (high current)
L=10uH, 3W+4W+4W, 60mA+40mA+40mA
ILED1+IED2+ILED3 (mA
20.8
20.6
ILED1
ILED2
1
40
L=10uH, 4W+4W+4W, 60mA+40mA+40mA
ILED (mA)
20.4
20.2
20.0
1
9.8
1
9.6
1
9.4
1
9.2
1
9.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
1
30
1
20
10
1
1
00
L=10uH, 4W+4W+4W, 40mA+40mA+40mA
L=4.7uH, 4W+4W+4W, 40mA+40mA+40mA
ILED3
Interleave
L = 4.7uH
4 WLED/ch
TA = 25 ºC
5.5
6.0
L=4.7uH, 4W+4W+4W, 35mA+30mA+30mA
90
80
70
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
No-Interleave
TA = 25 ºC
V IN (V)
V IN (V)
EFFICIENCY v.s VIN
90
90
EFFICIENCY vs. ILED
Vin=5.6V
85
Efficiency (%
Efficiency (%
85
80
4.2V
3.6V
3.0V
2.7V
75
80
70
Interleave
ILED1,2,3 = 20mA
L = 4.7uH
4 WLED/ch
75
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
65
60
0
5
1
0
1
5
20
25
L = 4.7uH
4 WLED/ch
TA = 25 ºC
30
35
V IN (V )
ILED (m A)
EFFICIENCY vs. INDUCTOR
90
90
EFFICIENCY vs. STRING CONFIGURATION
L=4.7uH
L=3.3uH
85
88
86
ILED=20mA+20mA+20mA
L=2.7uH
Efficiency (%
Efficiency (%
L=1.5uH
80
84
ILED=5mA+10mA+20mA
82
80
78
75
L=10uH
L=15uH
ILED=20mA+10mA+5mA
70
ILED1,2,3 = 20 mA
4 WLED/ch
TA = 25 ºC
65
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
76
74
2.0
2.5
3.0
3.5
4.0
Interleave
L = 4.7uH
CH1,2,3 = 4W+3W+2W
TA = 25 ºC
4.5
5.0
5.5
6.0
V IN (V )
©
2006 California Micro Devices Corp. All rights reserved.
04/26/06
V IN (V )
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
5
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