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PRELIMINARY CM9156B Charge-Pump White LED Driver
Features
* * * * * * * * * * * * * * * 3.0V to 6.5V input voltage range Dual mode operation; 1x and 1.5x Fixed 4.5V output with initial accuracy of 2% Supports up to 180mA (@4V) output High efficiency at both high and low input voltage Low external parts count, requires no inductor PWM brightness control via the ENA pin Selectable 262kHz or 650kHz switching frequency Low shutdown current of <1A Soft start prevents excessive inrush current Over-temperature and over-current protection Low output ripple (<1%), low EMI Input protection provides superior ESD rating, requiring only standard handling precautions TDFN-10 or MSOP-10 package Optional RoHS compliant lead free package
Product Description
CM9156B is an efficient 1.5x switched capacitor (charge pump) regulator ideal for white LED applications. It has a regulated 4.5V, 120mA output, capable of driving up to six parallel white LEDs. With a typical operating input voltage range from 3.0V to 6.0V, the CM9156B can be operated from a single-cell Li-Ion battery. It features an efficient, 1.5x charge-pump circuit that uses only two 1.0F ceramic bucket capacitors and two small capacitors for VIN and VOUT. The CM9156B offers a selectable switching frequency of 262kHz or 650kHz. The LED brightness can be adjusted by applying a PWM signal on the ENA pin. The CM9156B output voltage is regulated to 4.5V, 5% over the line and load ranges. Up 180mA of output current is available. 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. It offers low output voltage ripple, typically less than 50mV. Internal over-temperature and over-current management provide short circuit protection. The CM9156B is packaged in either a space saving 10-Lead TDFN or 10-Lead MSOP package. It can operate over the industrial temperature range of - 25-C to 85-C. .
Applications
* Drive white LEDs to backlight color LCDs Drive white or RGB LEDs for camera flash Cellular phones MP3 players PDAs, GPS
Typical Application
4.5V 1.0uF V OUT C 1P 3.0V to 6.0V V IN 1.0uF CLK C 2P C 1N
1.0uF
PhotonIC
CM9156B
TM
1.0uF
GND C 2N E NA
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PRELIMINARY CM9156B
Package Pinout
PACKAGE / PINOUT DIAGRAM
TOP VIEW
BOTTOM VIEW
(Pins Up View)
12345
TOP VIEW
VOUT C1P VIN CLK NC 1 2 3 4 5 10 9 8 7 6 C2P C1N GND C2N ENA
Pin 1 Marking
(Pins Down View)
10 9 8 7 6
CMxxx xxxxxx
GND PAD
12345
10 9 8 7 6
CM9156B-01MR 10 Lead MSOP Package
Note: This drawing is not to scale.
CM9156B-01DE 10 Lead TDFN Package
Ordering Information
PART NUMBERING INFORMATION
Lead-free Finish Pins Package Ordering Part Number1 Part Marking
10 10
TDFN MSOP
CM9156B-01DE CM9156B-01MR
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 VOUT to GND C1P, C1N to GND ENA, CLK to GND Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10s) RATING 2 [GND - 0.3] to +6.5 [GND - 0.3] to +6.0 [GND - 0.3] to +4.5 [GND - 0.3] to +6.0 -65 to +150 -40 to +85 300 UNITS kV V V V V C C C
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PRELIMINARY CM9156B
Specifications (cont'd)
ELECTRICAL OPERATING CHARACTERISTICS
SYMBOL VIN ISD IQ PARAMETER VIN Supply Voltage Shut-Down Supply Current Quiescent Current ENA = 0 Fs = 262 kHz Fs = 650 kHz Fs = 262 kHz or 650 kHz, Iout = 0 mA to 120 mA, VR LOAD Load Regulation Vin = 3.2V to 6.5V Iout = 0 mA to 90 mA, Vin = 3.0V to 3.2V Iout = 60 mA, VR LIN Line Regulation Vin = 3.2V to 6.5V Vin = 3.0V to 3.2V Vout = 4.5V Vout = 4.0V Fs = 262 kHz, Iout = 60 mA CLK = 0 CLK = 1 1.2 0.6 1.3 0.4 400 135 15 600 4.0 4.4 4.0 4.1 4.5 4.1 4.2 4.6 4.3 120 180 50 262 650 V V V mA mA mV kHz kHz V V V V mA C C 4.2 4.5 4.7 V CONDITIONS MIN 3.0 TYP 1 800 1600 1200 2500 MAX 6.0 UNITS V A A A
Charge-pump Circuit
IOUT VOUTR fs CLK
Output Current Output Ripple Voltage Switching Frequency
High Level Input Voltage Low Level Input Voltage ENA VIH VIL Protection ILIM TJSD THYS High Level Input Voltage Low Level Input Voltage Over-Current Limit Over-Temperature Limit Over-Temperature Hysteresis
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PRELIMINARY CM9156B
Typical Performance Curves
CIN=COUT=C1=C2=1.0F, TA=25C, unless specified
Efficiency
100 90 80 70 60 50 3.0 Iout=60mA 100 90 80 70 60 50 3.0
Efficiency
Iout=120mA
Efficiency (%)
3.5
4.0
4.5
5.0
5.5
6.0
Efficiency (%)
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Input Voltage (V)
262 kHz Load Regulation
4.75 5 Vin
4.75
650 kHz Load Regulation
5 Vin
Vout (V)
Vout (V)
4.50
4.50 3.6 Vin 4.25 3.4 Vin
4.25
3.4 Vin
3.6 Vin
4.00 10 30 50 70 90 110
4.00 10 30 50 70 90 110
Load Current (mA)
Load Current (mA)
Line Regulation Iout=60mA
4.6 4.5
4.6 4.5
Line Regulation Iout=120mA
Vout (V)
4.3 4.2 4.1 4.0 3.00
Vout (V)
4.00 5.00 6.00
4.4
4.4 4.3 4.2 4.1 4.0 3.00
4.00
5.00
6.00
Vin (V)
Vin (V)
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PRELIMINARY CM9156B
Typical Performance Curves (cont'd)
CIN=COUT=C1=C2=1.0F, TA=25C, unless specified
No Load Input Current
2000 650kHz
4.550
Vout vs. Temperature
Vin = 3.6V
1600
4.525
Iq ( A)
1200
262kHz
Vout (V)
4.4 4.8 5.2 5.6 6.0
4.500
800
4.475
400 3.2
4.450
3.6
4.0
-40
-15
10
35
60
85
Vin (V)
Temperature (C)
Switching Frequency - 262kHz
278 690
Switching Frequency - 650kHz
Frequency (kHz)
270 85C 262 20C 254 - 40C 246 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
Frequency (kHz)
670 85C 650 20C 630 -40C 610 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
Input Voltage (V)
Input Voltage (V)
(c) 2006 California Micro Devices Corp. All rights reserved. 04/26/06
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PRELIMINARY CM9156B
Typical Performance Curves (cont'd)
CIN=COUT=C1=C2=1.0F, TA=25C, unless specified
Vin = 3.8V
Vin = 3.8V
Iout=120 mA
Iout=120 mA
Iout=60 mA 100 mV/div
Iout=60 mA 100 mV/div
Output Ripple, 262 kHz
Output Ripple, 650 kHz
Vin, 2V/div
Vout, 2V/div
Iin, 200 mA/div Vin=3.8V 1 ms/div
Startup
Frequency Selection Table
Switching Frequency 262kHz 650kHz CLK1 0 1
Table 1: Frequency Selection
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PRELIMINARY CM9156B
Functional Block Diagram
3.0V T O 6.0V 1.0uF
1.0uF
1.0uF
V IN
C 1P
C 1N
C 2P
C 2N
E NA
L DO Pre- R egulator
1.5x C harge Pump
V OUT
4.5V
1.0uF GND
OS C
C ounter
Driver
CM9156B
CLK
Pin Descriptions
PIN DESCRIPTIONS
LEAD(s) NAME DESCRIPTION
1 2 3 4 5 6 7 8 9 10
VOUT C1P VIN CLK NC ENA C2N GND C1N C2P
The regulated 4.5V output voltage pin. This pin requires a 1.0F or larger ceramic capacitor to ground. This pin connects to the anodes of the LEDs. This pin is the plus side of charge-pump bucket capacitor C1. Connect a 1.0F ceramic capacitor with a voltage rating of 10V or greater between C1N and C1P. Positive supply voltage input pin. This voltage should be between 3.0V and 6V. This pin requires a 1.0F or larger ceramic capacitor to ground. Pin for setting switching frequency (see Table 1 on page 6) Pin not connected. Enable pin, active high. By applying a PWM signal to this pin, the LED brightness can be controlled. This pin is the minus side of charge-pump bucket capacitor C2. Connect a 1.0F ceramic capacitor between C2N and C2P. Ground pin. This pin is the minus side of charge-pump bucket capacitor C1. Connect a 1.0F ceramic capacitor between C1N and C1P. This pin is the plus side of charge-pump bucket capacitor C2. Connect a 1.0F ceramic capacitor between C2N and C2P.
(c) 2006 California Micro Devices Corp. All rights reserved. 04/26/06
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PRELIMINARY CM9156B
Application Information
The CM9156B is a switched capacitor, charge pump voltage converter ideally suited for driving white LEDs to backlight or sidelight LCD color displays for portable devices, such as cellular phones, PDAs, and any application where small space and efficiency are critical. The CM9156B charge pump is the perfect driver for such portable applications, providing efficiency, compact overall size, low system cost and minimum EMI. The CM9156B contains a linear low dropout (LDO) regulator followed by a 1.5x fractional charge pump that converts the nominal lithium-ion (Li-Ion) or lithium polymer battery voltage levels (3.6V) by a gain of 1.5 times and regulates the converted voltage to 4.5V, 5%, enough to drive the forward voltage drop of white LEDs. The CM9156B requires only two external switched, or bucket, capacitors, plus an input and an output capacitor, providing for a compact, low profile design. In many applications, all these can conveniently be the same value of 1.0F, commonly available in a compact 0805 surface mount package. The CM9156B is intended for white LED applications, but it can drive most all types of LEDs with a forward voltage drop of less than 4V. The LED current is determined by its series resistor, RLED, and is approximately;
ILED = 4.5 V - VFWD _ LED RLED
put capacitors are charged during the power-up of the device. The input voltage, VIN, passes through an LDO preregulator that compares the output voltage to a precision bandgap reference. After the LDO, the charge pump boosts the LDO voltage by 1.5 times. A feedback circuit to the LDO monitors the output voltage, and when the output voltage reaches 4.5V, the LDO output will operate at about 3V, regulating the device output at 1.5 x 3V = 4.5V. The charge pump uses two phases from the oscillator to drive internal 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 the LDO to a voltage of VLDO/2. The next phase changes the switch positions so that C1 and C2 are put in parallel, and places them on top of VLDO. The resulting voltage across COUT is then; VLDO+1/2VLDO = 1.5 x VLDO.
VOUT VIN
FB LDO VLDO C2 1/2 VLDO C OUT C1 1/2 VLDO
Typical white LEDs have a forward voltage drop, VFWD_LED, of 3.5V to 3.7V. Like single-junction devices, white LEDs often have poorly matched forward voltages. If the LEDs were put in parallel without a series resistor, the current in the paralleled branches would vary, resulting in non-uniform brightness. RLED, in addition to setting the current, compensates for this variation by functioning as a ballast resistor, providing negative feedback for each paralleled LED.
Charge C1 and C2 to 1/2 V
LDO
VOUT VIN
FB LDO VLDO C2 1/2 VLDO C1 1/2 VLDO C OUT
CM9156B Operation
When a voltage exceeding the undervoltage lockout threshold (UVLO) is applied to the VIN pin, the CM9156B initiates a softstart cycle, typically lasting 1000s. Softstart limits the inrush current while the out-
Figure 1. Switch operation
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PRELIMINARY CM9156B
Application Information (cont'd)
When the input voltage is greater then the output voltage, then all this sophistication, and the accompanying power loss, is unnecessary. The smart CM9156B knows this, and if the input voltage rises above 5V, the charge pump automatically disables, removing the voltage gain stage and the output is then provided directly through the LDO, regulated at 4.5V. This increases the efficiency and minimizes chip heating in this operating condition. The CM9156B has over-temperature and over-current protection circuitry to limit device over-stress and failure during short circuit conditions. An overcurrent condition will limit the output current (approximately 400mA ~ 600mA) 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. For an ideal 1.5x charge pump, IIN = 1.5 x IOUT, and the efficiency may be expressed as;
POUT VOUT x IOUT VOUT = 1.5 x V V x 1.5 x I PIN OUT IN IN VOUT = 4.5V, 4.5V 1.5 x VIN
The ideal 2x charge pump can be similarly expressed;
P OUT 4.5V ------------- ---------------------P IN 2.0 x V IN
In 1x mode, when the input voltage is above the output voltage, the part functions as a linear regulator and the ideal efficiency is simply Vout/Vin. The typical conversion efficiency plots for these modes, with some losses, are shown in Figure 2.
Efficiency
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 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. The CM9156B charge pump automatically switches between 2 conversion gains, 1x and 1.5x, allowing high efficiency levels over a wide operating input voltage range. The 1x mode allows the regulated LDO voltage to pass directly through to the output when sufficient input voltage is available; the 1.5x charge pump is enabled only when the battery input is too low to sustain the output load. At nominal loads, the switching losses and quiescent current are negligible. If these losses are ignored for simplicity, the efficiency, , for an ideal 1.5x charge pump can be expressed as the output power divided by the input power;
P OUT ------------P IN
Efficiency
100 Vout=4.5V
Efficiency (%)
85
1X
70
CM9156B
dual mode
55
2X
40 3.0 3.5 4.0
1.5X
4.5
5.0
5.5
6.0
Input Voltage (V)
Figure 2. Ideal efficiency curves
As can be seen, the CM9156B, 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 CM9156B charge pump's 1,5x gain reduces the battery drain. At higher input voltages, above 4.9V typically seen when the system is running off an AC adapter, the CM9156B, operating the
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PRELIMINARY CM9156B
Application Information (cont'd)
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.
LED Brightness Control
CM9156B Design Example
Capacitor Selection
The external bucket capacitors will affect the output impedance of the converter, so surface-mount, low ESR ceramic capacitors are recommended. Tantalum and Aluminum capacitors should not be used because their ESR is too high. The ceramic dielectric must be stable over the operating temperature and voltage range, X7R or X5R dielectrics are recommended. In noise sensitive applications, output ripple can be further reduced by increasing the capacitance of the output capacitor. Reflected input ripple current depends on the impedance of the VIN source, which includes the PCB traces. Increasing the input capacitor will reduce this ripple. The input capacitor also affects the output voltage ripple. All the capacitors should be located close to the device for best performance.
VOUT C 2P C 1N GND C 2N C LK ENA
V in
C 1P VIN
CM9156B
PWM input
Figure 3. PWM brightness control, lowered quiescent current Changes in ambient light often require the backlight display intensity to be adjusted, usually to conserve battery life. There are simple solutions to lowering the LED brightness when using the CM9156B. A PWM signal applied to the ENA pin can be used to control the brightness, which is more efficient than other solutions that dissipate unwanted LED current in the series resistors. It also maintains the white LED color fidelity by avoiding color temperature variations that come with bias current changes. The LED intensity is determined by the PWM duty cycle, which can vary from 0% to 100%. In the configuration shown in Figure 3, the brightness is controlled by the PWM signal applied to the LEDs. Decreased Duty Cycle will lower the LED brightness, See Figure 4 and Figure 5. The same signal is also applied to the CM9156B, reducing the charge pump switching frequency via the CLK control. When the PWM signal is high, CLK goes high, the operating frequency is 650kHz (refer to Table 1), and the LED current path is complete through the switch. When the PWM signal is low, the LED current is stopped as the switch turns off, and the switching frequency of the charge pump becomes 262kHz (CLK = 0). Operating the charge pump at the lower frequency lowers the quiescent current when the charge pump is operational (the input voltage below 5V).
Frequency Selection
The optimal switching frequency depends on the allowable system current draw, the load current, ripple and EMI requirements. The CM9156B's operating frequency choices are 262kHz or 650kHz. These two frequencies are selected by programming the CLK input. Refer to Table 1. The supply current for a charge pump is proportional to its switching frequency. A lower switching frequency allows reduced quiescent current for more efficient operation, but reduces the output current capability and in some cases, causes higher ripple. Higher frequencies are used when larger load currents are demanded. The frequency is typically selected to achieve maximum efficiency while avoiding sensitive frequencies with the switching fundamental and its harmonics. The switching frequency can be set outside the critical frequency spectrums of cellular communications bandwidths. Once set, the switching frequency and its harmonics remain fixed, making filtering easy.
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PRELIMINARY CM9156B
Application Information (cont'd)
Camera Flash Application
C2N, 5V/div
PWM, 20 kHz, 60% D.C., 5V/div
Vout ripple, 200 mV/div
Many smart phones and PDAs include a digital camera. These cameras typically utilize a WLED flash to illuminate the picture subject in low light conditions. The CM9156B is easily adapted to such an application. Figure 6 is a typical application using the CM9156B as a WLED flash driver, which is ideal for this application because it is capable of driving up to 180mA from a Liion battery. The One-shot is used to create a single pulse of a set duration to the ENA pin of the CM9156B. The Flash LED modules shown here contain three matched WLEDs with a common anode and separated cathodes. The series resistor is chosen based on the forward drop of the module LEDs (typically 3.3V to 3.8V) and the number of parallel LEDs being driven.
Iin, 200 mA/div
Vin=3.8V
20 uSec/div
Figure 4. High brightness waveforms
VOUT C 2P C 1N GND C 2N C LK ENA R CAT HODE R CAT HODE
The recommended PWM frequency is between 100 Hz and 20kHz. 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.
V in
C 1P VIN
CM9156B
Flash
One- shot Pulse t
C2N, 5V/div
Figure 6. Camera flash application
PWM, 20 kHz, 10% D.C., 5V/div
Layout Guide
The charge pump is rapidly charging and discharging its external capacitors, so external traces to the capacitors should be made as wide and short as allowable 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. Connect ground and power traces to the capacitors through short, low impedance paths. Use a solid ground plane, ideally on the backside of the PCB, which should carry only ground potential. Connect the ground-side of Cin, Cout and the chip GND as close as practical. For best thermal performance, the exposed backside lead frame should be soldered to the PCB.
Vout ripple, 200 mV/div
Iin, 200 mA/div Vin=3.8V 20 uSec/div
Figure 5. Low brightness waveforms
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PRELIMINARY CM9156B
Mechanical Details
TDFN-10 Mechanical Specifications Dimensions for the CM9156B packaged in a 10-lead TDFN package are presented below. For complete information on the TDFN-10, see the California Micro Devices TDFN Package Information document. Mechanical Package Diagrams
D
10 9 8 7 6
PACKAGE DIMENSIONS
Package JEDEC No. Leads Dim. A A1 A2 A3 b D D2 E E2 e K L # per tube # per tape and reel 1.30 0.20 1.40 2.20 0.18 Millimeters Min 0.70 0.00 0.45 Nom 0.75 0.02 0.55 0.20 0.25 3.00 2.30 3.00 1.50 0.50 1.50 0.30 1.70 0.40 0.051 0.008 NA 3000 pieces 1.60 0.055 2.40 0.087 0.30 0.007 Max 0.80 0.05 0.65 Min 0.028 0.000 0.018 TDFN MO-229 (Var. WEED-3)= 10 Inches Nom 0.030 0.001 0.022 0.008 0.010 0.118 0.091 0.118 0.060 0.020 0.060 0.012 0.067 0.016 Pin 1 ID
C0.35
E
Pin 1 Marking
Max 0.031 0.002 0.026
0.10 C
12345 TOP VIEW
0.012
0.08 C
0.094
A1
SIDE VIEW
A
A3 A2
0.063
1
2
3
4
5
GND PAD
Controlling dimension: millimeters
D2 L
=This package is compliant with JEDEC standard MO-229, variation WEED-3 with exception of the "D2" and "E2" dimensions as called out in the table above.
K e
10
9
8
7
6
b
8X
E2
BOTTOM VIEW
0.10
M
CAB
Package Dimensions for 10-Lead TDFN
(c) 2006 California Micro Devices Corp. All rights reserved.
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PRELIMINARY CM9156B
Mechanical Details (cont'd)
MSOP-10 Mechanical Specifications: The CM9156B is supplied in a 10-pin MSOP. Dimensions are presented below. For complete information on the MSOP-10, see the California Micro Devices MSOP Package Information document. Mechanical Package Diagrams
TOP VIEW
D
10 9 8 7 6
PACKAGE DIMENSIONS
Package Pins Dimensions A A1 B C D E e H L # per tape and reel Millimeters Min 0.75 0.05 0.17 0.15 2.90 2.90 Max 0.95 0.15 0.33 0.30 3.10 3.10 Min 0.030 0.002 0.007 0.006 0.114 0.114 MSOP 10 Inches Max 0.038 0.006 0.013 0.018 0.122 0.122
SIDE VIEW 1 2 3 4 5
H
Pin 1 Marking
E
A
SEATING PLANE
A1 B e
END VIEW
0.50 BSC 4.90 BSC 0.40 0.70 4000
0.0197 BSC 0.193 BSC 0.0157 0.0276
Controlling dimension: inches
C
L
Package Dimensions for MSOP-10
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