PRELIMINARY
CM9130
Three Output Driver for White LEDs
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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 voltages
Precision regulation for each output with 2% cur-
rent matching at 20mA
Programmable LED current via ISET pin
Typical 500 KHz fixed switching frequency
Supports up to 300mA, drives three LEDs regu-
lated 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
TQFN-16 package
Optional RoHS compliant lead free packaging
Product Description
The CM9130 is an adaptive fractional switched capaci-
tor (charge pump) regulator optimized for driving 3
white LEDs. Each LED's driver current is matched to
within 2% for uniform intensity. It supports an input volt-
age 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.
The CM9130 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 CM9130 can also be
used for a camera flash. In full shutdown mode, the
CM9130 draws only 10µA.
The CM9130 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 V
IN
provides longer battery life. With a high V
IN,
or
when the adapter is powered, it provides cool reliable
operation.
The CM9130 is available in a compact 16 lead TQFN
package. It can operate over the industrial temperature
range of -40°C to 85°C.
Applications
•
•
•
•
Drives white LEDs for STN/TFT Color LCD back-
lighting
Cell phones, PDAs
Digital Still Cameras
Flash for DSC
Typical Application
1.0uF
C1P C1N
2.9V to 6.0V
1uF
on
1.0uF
C2P
C2N
VOUT
1uF
VIN
PhotonIC
CM9130
EN
ISET
GND
TM
LED1
LED2
LED3
Enable
off
R
SET
©
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
PRELIMINARY
CM9130
Package Pinout
PACKAGE / PINOUT DIAGRAM
Bottom View
8 C2N
5 NC
6 NC
7 NC
ISET1
VIN
C1P
LED1
4
3
2
1
16
15
14
13
9 EN
TQFN16
4X4
10 GND
11 C1N
12 NC
LED3
LED2
Note: This drawing is not to scale.
16-Lead TQFN Package
(4mm x 4mm)
Ordering Information
PART NUMBERING INFORMATION
Lead-free Finish
Leads
16
Package
TQFN
Ordering Part Number
1
CM9130-01QE
Part Marking
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
ESD Protection (HBM)
Pin Voltages
V
IN
to GND
V
OUT
to GND
ISET, EN to GND
All other pins to GND
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering, 10s)
RATING
±
2
[GND - 0.3] to +6.0
[GND - 0.3] to +7.0
[GND - 0.3] to +5.0
[GND - 0.3] to +5.0
-65 to +150
-40 to +85
300
UNITS
kV
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
VOUT
C2P
l
Fax: 408.263.7846
l
www.cmd.com
04/26/06
PRELIMINARY
CM9130
Typical Performance Curves
Charge Pump Efficiency
Vled=3.2V
100
200
175
150
125
100
75
50
25
3.0
Source Current
Vled=3.2V
Efficiency (%)
90
Input Current (mA)
Iout=120mA
80
Iout=120mA
Iout=30mA
Iout=60mA
70
Iout=60mA
Iout=30mA
60
3.0
3.5
4.0
4.5
5.0
5.5
6.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Input Voltage (V)
Typical Waveforms
Cin=C2=C3=Cout=1uF, Iout=120mA
100 mV/
div
100 mV/
div
Typical Waveforms
Cin=C2=C3=Cout=1uF, Iout=120mA
Vout
Vout
20mA/
div
Iin
20mA/
div
Iin
50mV/
div
1.0x mode
1us/div
Vin
50mV/
div
1.5x mode
1us/div
Vin
Startup
Cin=C2=C3=Cout=1uF, Iout=120mA
25
LED Current vs. Vin
LED Current (mA)
2V/
div
200mA/
div
2V/
div
.5ms/div
ENB
20
Iin
15
Vout
10
5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
©
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
CM9130
Functional Block Diagram
C1P C1N
C2P C2N
VIN
OSC
500 KHz
Charge Pump x1, x1.5
VOUT
UVLO
Bandgap
ISET
LED1
Mode Select
LED2
Current
Sinks
LED3
Failed LED
Condition
GND
CM9130
EN
Pin Descriptions
PIN DESCRIPTIONS
LEAD(s)
NAME
DESCRIPTION
1
2
3
LED1
C1P
VIN
Cathode of LED1 pin.
This pin is the plus side of charge pump bucket capacitor C1. Connect a 1.0μF
ceramic capacitor with a voltage rating of 10 V or greater between C1N and C1P.
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, R
SET
, is connected between this pin and ground.
The regulated LED current is 1000x the current flowing in R
SET
, and is
approximately:
0.66V –
(
LogicLow
)
-
I
LED
= ----------------------------------------------------
×
1000
R
SET
4
ISET
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
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
5
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