MPS MP3001 1x, 1.5x, 2x auto-adjust charge pump white led backlight and flashlight driver Datasheet

MP3001
1x, 1.5x, 2x Auto-Adjust Charge Pump
White LED Backlight and Flashlight Driver
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP3001 is a dual function WLED driver
intended for camera phone applications. It can
drive up to 4 backlight WLEDs at up to 30mA
each and a flash WLED at up to 250mA.
Backlight brightness can be adjusted with a
5-bit register plus one bit for precise low
brightness control.
•
The MP3001 employs a super efficient
inductorless charge pump with 1x, 1.5x and 2x
automatic mode control to achieve high
efficiency power conversions.
•
Simultaneous Support of Backlight and
Flash LEDs up to 370mA
Three Independent Controls on WLED
Currents
Backlight: up to 4 WLEDs at 30mA Each
Flashlight: up to 250mA Total
Preview: up to 120mA Total
Single Wire Serial Bus (MPCTM Serial Data Link)
Simple, Low Overhead Solution
Fast Data Transfer Rate
Good Current Matching at Low LED Current Level
Thermal Shutdown Protection
Under-Voltage Protection
Available in a 3mm x 3mm 16-Pin QFN Package
Low EMI Noise
•
•
•
•
•
•
Monolithic Power System’s single wire MPCTM
serial data link provides a simple and fast
interface used to enable, disable and set
current levels for each LED. In addition,
soft-start limits the inrush current during startup
and mode switching.
APPLICATIONS
•
•
•
Each output is current limited, providing
controlled brightness and short circuit protection.
Thermal shutdown protection guards against
excessive loads and shorts.
Cellular Phones
PDA Phones
PDAs
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
“MPC” is a Trademark of Monolithic Power Systems, Inc.
The tiny 3mm x 3mm QFN 16-pin package and
small external capacitors deliver the most
compact white LED solution available.
TYPICAL APPLICATION
4
3
6
2
SINGLE PIN SERIAL PORT
8
11
10
9
5
MP3001 Rev. 0.91
9/21/2007
FL
VIN
D2
D3
D4
250mA Total
Flash/Preview
16
C2A
LED0
MP3001
15
LED1
14
LED2
13
LED3
120mA Total Backlight
ISET1
ISET2
ISET3
VSS
1
CP
I_LED=10mA
90
FLED
C1B
DATA
100
12
C1A
C2B
D1
Efficiency vs
Battery Voltage
COMMON ANODE
CONFIGURATION
CONNECT EXPOSED PAD TO PIN5
EFFICIENCY (%)
BATT
7
80
70
60
50
I_LED=20mA
I_LED=30mA
40
30
20
2.5
3.0
3.5
4.0
BATTERY VOLTAGE (V)
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1
MP3001 – AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT AND FLASH DRIVER
ABSOLUTE MAXIMUM RATINGS (1)
PACKAGE REFERENCE
All Other Pins.............................. –0.3V to +6.5V
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature ..............–65°C to +150°C
Supply Voltage VIN ........................... 2.5V to 6V
Operating Temperature .............–40°C to +85°C
TOP VIEW
PIN 1 ID
LED0 LED1 LED2 LED3
16
15
14
13
CP
1
12
FLED
C2B
2
11
ISET1
C1B
3
10
ISET2
C1A
4
9
ISET3
5
6
7
8
VSS
C2A
VIN
DATA
Recommended Operating Conditions
Supply Voltage VIN .......................... 2.7V to 5.5V
Operating Temperature .............–40°C to +85°C
Thermal Resistance
EXPOSED PAD
CONNECT TO PIN 5
*
(2)
(3)
θJA
θJC
QFN16 (3mm x 3mm) ............. 60 ...... 12... °C/W
Part Number*
Package
Temperature
MP3001DQ
QFN16
(3mm x 3mm)
–40°C to +85°C
For Tape & Reel, add suffix –Z (eg. MP3001DQ–Z)
For RoHS compliant packaging, add suffix –LF (eg.
MP3001DQ–LF–Z)
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
VBATT = 3.6V, TA = +25°C, unless otherwise noted.
Parameter
Input Supply Voltage
Symbol
VIN
Supply Current
IIN
Supply Current Shutdown
Current Matching (4)
DATA Voltage, High
DATA Voltage, Low
DATA Pin Leakage
Data Acceptance Pulse Width
Data Stop Pulse Width
Charge Pump Frequency
Voltage of ISET1/2/3
Backlight LED Current for each
LED
Total Flash LED Current
(Continuous)
Total Flash LED Current
Total LED Current
Thermal Shutdown (5)
IIN SHDN
Condition
1
0.1
30
3
Units
V
mA
mA
mA
µA
%
V
V
µA
µs
µs
MHz
V
mA
mA
15
120
mA
250
370
mA
mA
°C
No Load, CP = 2x
No Load, CP = 1.5x
No Load, CP = 1x
VDATA = 0V
ILED = 30mA
ILED MATCH
VDATA (HIGH)
VDATA (LOW)
IDATA
VDATA = 5V
TDAPW
TDSPW
FCP
VISET
HC/LC = 0
IBL
HC/LC = 1
IFL
ITOTAL
TS
Min
2.7
Typ
6
4
0.5
0.1
1.5
Max
5.5
1.0
1.2
–1.0
1.5
8
1.0
0.4
+1.0
3.5
1.2
1.25
Pulsed < 500ms, 3V < VIN < 5.5V
3V < VIN < 5.5V
150
1.4
Note:
4) Current matching definition: (Max – Min)/(Max + Min)
5) Guaranteed by design.
MP3001 Rev. 0.91
9/21/2007
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MP3001 – AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT AND FLASH DRIVER
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name Description
CP
Charge pump bypass for common anode version. Connect a 2.2μF bypass capacitor to GND.
Charge Pump Capacitor #2 Negative Node. Connect the negative side of the #2 charge pump
C2B
capacitor to C2B.
Charge Pump Capacitor #1 Negative Node. Connect the negative side of the #1 charge pump
C1B
capacitor to C1B.
Charge Pump Capacitor #1 Positive Node. Connect the positive side of the #1 charge pump
C1A
capacitor to C1A. Typical applications require C1 to be 1μF.
VSS Battery Power Ground. Connect the exposed pad to this pin.
Charge Pump Capacitor #2 Positive Node. Connect the positive side of the #2 charge pump
C2A
capacitor to C2A. Typical applications require C2 to be 1μF.
Battery Power Input. Connect the 2.5V to 5.5V input source between BATT and GND. Bypass
VIN
BATT to GND with a 2.2μF or greater capacitor.
Data Input and Single Pin Serial Port for Control of All Functions. See Part Description. An
DATA
external pull down resistor with a typical value of 100kΩ is required
Current Control Input. Connect a resistor between ISET3 and GND to set the flash preview
ISET3
LED current up to 120mA.
Current Control Input. Connect a resistor between ISET2 and GND to set the flash LED current
ISET2
up to 250mA.
Current Control Input. Connect a resistor between ISET1 and GND to set the backlight LED
ISET1
string current up to 30mA each
Driver for Flashlight. Connect the flashlight LED between this pin and BATT, with the anode at
FLED
BATT. If Flash is not used, leave the pin open.
#4 LED Driver for Backlight. Connect a backlight LED between this pin and BATT, with the
LED3
anode at BATT. If this pin is not used, leave the pin open.
#3 LED Driver for Backlight. Connect a backlight LED between this pin and BATT, with the
LED2
anode at BATT. If this pin is not used, leave the pin open.
#2 LED Driver for Backlight. Connect a backlight LED between this pin and BATT, with the
LED1
anode at BATT. If this pin is not used, leave the pin open.
#1 LED Driver for Backlight. Connect a backlight LED between this pin and BATT, with the
LED0
anode at BATT. If this pin is not used, leave the pin open.
MP3001 Rev. 0.91
9/21/2007
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MP3001 – AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT AND FLASH DRIVER
TYPICAL PERFORMACE CHARACTERISTICS
VBATT = 4.2V, TA = +25°C, unless otherwise noted.
Efficiency vs
Battery Voltage
I_LED=10mA
80
70
60
I_LED=20mA
50
I_LED=30mA
40
LED CURRENT (mA)
EFFICIENCY (%)
90
35
3.5
30
3.0
25
20
15
10
5
30
20
2.5
3.0
3.5
4.0
BATTERY VOLTAGE (V)
4.5
0
LED Current Deviation (HC)
vs Battery Voltage
1.00
LED Current (LC) Over
32 Brightness Levels
LED CURRENT (mA)
100
LED Current (HC) Over
32 Brightness Levels
2.5
2.0
1.5
1.0
0.5
0
5
10 15 20 25
BRIGHT LEVEL
30
0
0
5
10 15 20 25
BRIGHT LEVEL
30
LED Current Deviation (LC)
vs Battery Voltage
60
LED CURRENT (mA)
LED1
0.50
40
LED1
LED2
20
0.00
LED2
0
-0.50
-1.00
2.50
LED3
LED4
-20
3.50
4.50
5.50
BATTERY VOLTAGE (V)
MP3001 Rev. 0.91
9/21/2007
-40
2.50
LED3
LED4
3.50
4.50
5.50
BATTERY VOLTAGE (V)
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MP3001 – AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT AND FLASH DRIVER
TYPICAL PERFORMACE CHARACTERISTICS (continued)
VBATT = 4.2V, TA = +25°C, unless otherwise noted.
Soft Start to 1X Mode
Soft Start to 2X Mode
Soft Start to 1.5X Mode
VIN = 4.2V,1X Mode, 4 LED Full
Brightness
VIN = 2.7V, 2X Mode, 4 LED Full
Brightness
VIN = 3.5V, 1.5X Mode, 4 LED Full
Brightness
DATA
2V/div.
DATA
2V/div.
DATA
2V/div.
IBAT
50mA/div.
IBAT
100mA/div.
IBAT
100mA/div.
CP
2V/div.
CP
2V/div.
CP
2V/div.
40μ s/div.
40μ s/div.
40μ s/div.
Mode Change
From 1X to 1.5X
Mode Change
From 1.5X to 2X
Charge Pump Waveform
at 1.5X Mode
VIN = 3.3V,4 LED Full Brightness
VIN = 2.7V, 4 LED Full Brightness
VIN = 3.06V, 4 LED Full Brightness,
1.5X Mode
CP
2V/div.
CP
2V/div.
C1A
2V/div.
C1A
2V/div.
C1A
2V/div.
IBAT
100mA/div.
C1B
2V/div.
IBAT
100mA/div.
C1B
2V/div.
100μ s/div.
C1B
2V/div.
C2A
2V/div.
C2B
2V/div.
100μ s/div.
400ns/div.
Flash Current
Charge Pump Waveform
at 2X Mode
Battery Voltage = 4.2V
VIN = 3.06V, 4 LED Full Brightness,
2X Mode
C1A
2V/div.
C1B
2V/div.
DATA
2V/div.
C2A
2V/div.
C2B
2V/div.
IFLASH
100mA/div.
400ns/div.
MP3001 Rev. 0.91
9/21/2007
20ms/div.
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MP3001 – AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT AND FLASH DRIVER
OPERATION
The MP3001 uses a charge pump architecture
optimized to support both white LED backlight
and flash driver needs. To maximize power
efficiency, it automatically switches between 1X,
1.5X, and 2X modes. The device provides
regulated current for up to four backlight LEDs
and one flash LED.
Single Pin Serial Port Operation
The DATA pin acts as a single wire port for
sending brightness data, LED selection and
LED control to the MP3001. The MPCTM
protocol is very flexible and easy to use and is
based entirely on short and long pulses, see
Table 1 below. Short pulses having a width
within the specified range are accepted as data.
Polarity of the data matches the pulse polarity.
Long pulses having a pulse width greater than
the minimum specified serve two purposes in
the communication. First, they are used to
separate two similar data values. For example,
back-to-back “1” data must be separated by a
long low pulse otherwise a “0” would be seen
between. Similarly, back-to-back “0”s must be
separated by a long high. Second, long pulses
are used to indicate end of communication by
sending two back-to-back long pulses. Any
number of bits up to a maximum of 11 can be
entered during one communication, always
starting with bit 0. The register value will not
change until new input is received or the
register is reset.
The charge pump automatically responds to
changing conditions such as supply voltage,
forward diode voltage and mode selection in
order to maintain LED current and maximize
efficiency.
The single pin interface provides on/off control,
individual WLED selection, mode selection, and
brightness control for the backlight. A 5-bit
backlight brightness register provides 32 levels
of current (brightness) control. ISET1 controls
the maximum brightness of the backlights,
ISET2 sets the brightness of the flash and
ISET3 sets the brightness for preview mode.
Furthermore, the MP3001 is equipped with a
low brightness backlight mode where the
backlight current can be set accurately down to
100µA.
Table 1—MPC™ Pulse Detail
Soft-start and mode changes limit the inrush
current in the MP3001. The MP3001 uses
charge pump derating over a period of 200µs to
limit inrush current. Before startup the part
checks for a shorted charge pump and
pre-charges its capacitors. This further prevents
inrush and over-current situations in the part.
Parameter
Minimum
Maximum
Tshort
1.5µs
3.5µs
Tlong
8µs
NA
Note
Accepted
Pulse
Ignored
Pulse
Send Pattern <11010010101>
Begin on first
acceptable pulse
DATA LINE
End on back-to-back
long pulse
1
1
0
Tshort
Tshort
1
0
Tshort
Tshort
Tlong
0
Tshort
Tshort
1
0
1
Tshort
Tshort
0
Tshort
Tshort
Tlong
1
Tshort
Tlong
Tlong
Figure 1—Protocol Waveforms
MP3001 Rev. 0.91
9/21/2007
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MP3001 – AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT AND FLASH DRIVER
On/Off
Bit
HC/LC
Bit
0
1
1-bit
1-bit
<0>
<1>
<0>
<1>
OFF
ON
High Current
Low Current
LED Sel
Bits
2
3
2-bits
<23>
<00>
<11>
<10>
<01>
Mode
Bits
4
Brightness
Bits
5
6
7
2-bits
All On
1 LED On
2 LEDs On
3 LEDs On
<45>
<00>
<10>
<01>
<11>
8
9
10
5-bits
BL Only
BL + Preview
BL + Flash
Flash Only
<678910>
<00000> 1 X Max Brightness / 32
<10000> 2 X Max Brightness / 32
<01000> 3 X Max Brightness / 32
<11000> 4 X Max Brightness / 32
.
.
.
.
.
.
<11111> Max Brightness
Figure 2—Control Register
Control Register Definition
The control register is as follows:
•
•
•
•
•
•
Bit 0 is the enable bit and determines
whether the part is active or in shutdown
Bit 1 allows the part to be put into a low
current mode
Bits 2-3 control which backlight WLED pins
are active
Bits 4-5 control the mode [BL=backlight]
Bits 6-10 control the brightness. Step size
and max brightness depend on R1 and Bit1.
Bit 6 is the LSB.
Default is all “0” and the register is reset
only upon power up.
Shutdown
Setting the DATA-bit low [DATA:0] causes
shutdown. During shutdown, the charge-pump
output is switched to VSS through a weak path.
The supply current will be less than 1μA in
shutdown.
Setting the Backlight LED Current
The full-scale backlight LED regulation current is
set through the resistor R1 (refer to the typical
application circuit on page 1). The voltage across
R1 is fixed at 1.25V, and the internal current
gain (ILED/IR1) is set at 100. Choose R1 for the
desired full-scale LED current according to the
equation:
R1 = 125kΩ ×
1mA
IMAX
Where R1 is in kΩ, and ILED is in mA. Suitable
values for R1 are greater than 4.2kΩ.
The exact LED current between 0 and the max
set by R1 is determined by the brightness code
and the HC/LC bit.
The HC/LC bit allows for fine control at low
current settings. The following table and graph
exhibit the possible settings for a R1 of 4.2kΩ.
Soft-Start
During startup and mode switching, an internal
soft-start prevents excessive input current thus
preventing excessive loading of the battery or
input power source.
MP3001 Rev. 0.91
9/21/2007
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MP3001 – AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT AND FLASH DRIVER
Table 2—Setting Backlight LED Current
35
ILED(mA)
HC/LC = 0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0.94
1.88
2.81
3.75
4.69
5.63
6.56
7.50
8.44
9.38
10.31
11.25
12.19
13.13
14.06
15.00
15.94
16.88
17.81
18.75
19.69
20.63
21.56
22.50
23.44
24.38
25.31
26.25
27.19
28.13
29.06
30.00
MP3001 Rev. 0.91
9/21/2007
ILED(mA)
HC/LC = 1
0.09
0.19
0.28
0.38
0.47
0.56
0.66
0.75
0.84
0.94
1.03
1.13
1.22
1.31
1.41
1.50
1.59
1.69
1.78
1.88
1.97
2.06
2.16
2.25
2.34
2.44
2.53
2.63
2.72
2.81
2.91
3.00
30
CURRENT (mA)
5-Bit
Brightness
Code
HC/LC = 0
25
20
15
10
HC/LC = 1
5
0
0
10
20
30
CODE (1 to 32)
40
Figure 3—Brightness Control
Setting the Flash LED Current
The Flash LED regulation current is set through
the resistors R2 and R3 (refer to the typical
application circuit on page 1). R2 sets the
current for Flash mode and R3 sets the current
for Preview mode. The internal current gain
(IFLED/IR2) is set at 1000.
Choose R2 for the desired flash current
according to the equation:
R2 = 1250kΩ ×
1mA
IFLED
Where R2 is in kΩ, and IFLED is in mA. Suitable
values for R2 are greater than 5kΩ.
Choose R3 for the desired preview current
according to the equation:
R3 = 1250kΩ ×
1mA
IFLED
Where R3 is in kΩ, and IFLED is in mA. Suitable
values for R3 are greater than 10.4kΩ.
CP Pin
Do not drive or force CP as it may be shorted to
ground or may be pumped down by the
controller in the MP3001 at any time. Excessive
capacitance on the CP node can cause the
internal controller to time out before the charge
pump can be ready. Missing the timeouts will
cause excessive pumping and a loss of
efficiency. The MP3001 requires C1 and C2 be
of the same value and type.
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MP3001 – AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT AND FLASH DRIVER
PACKAGE INFORMATION
QFN16 (3mm x 3mm)
2.90
3.10
1.50
1.80
0.30
0.50
PIN 1 ID
MARKING
0.18
0.30
2.90
3.10
PIN 1 ID
INDEX AREA
13
16
12
PIN 1 ID
SEE DETAIL A
1
1.50
1.80
0.50
BSC
4
9
5
8
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
0.30x45” TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.80
1.00
0.20 REF
0.00
0.05
DETAIL A
SIDE VIEW
2.90
NOTE:
1.70
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) DRAWING CONFORMS TO JEDEC MO-220, VARIATION VEED-4.
5) DRAWING IS NOT TO SCALE.
0.70
0.25
0.50
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP3001 Rev. 0.91
9/21/2007
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MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
9