MPS MP1529DR

TM
MP1529
Fixed Frequency Step-Up Converter
LCD Backlight Plus Flash
The Future of Analog IC Technology
TM
DESCRIPTION
FEATURES
The MP1529 is a step-up converter plus 3
current sources for driving two 6-LED backlight
strings to 30mA and a 4-LED flash string to
150mA from a single Lithium-Ion battery.
•
•
•
•
•
•
•
The step-up converter generates an output
voltage as high as 25V from a 2.7V to 5.5V
input source. Three current sources drive in
three modes. In backlight mode two strings of 6
LEDs are lit with up to 30mA of current. In the
backlight plus preview mode the 4 flash LEDs
are lit with the preview current. In flash mode
the flash LEDs are lit with up to 150mA of
current and the two backlight strings are turned
off. There are three pins to independently set
the backlight, preview and flash current.
The MP1529 includes built-in open lamp over
voltage protection, cycle-by-cycle current limit,
over temperature shutdown, input under voltage
control and integrated soft-start.
The MP1529 is available in a tiny 16-pin 4mm x 4mm
package.
•
•
•
•
•
•
2.7V to 5.5V Input Voltage Range
25V Maximum Step-Up Voltage
<1µA Shutdown Mode
1.2MHz Fixed Frequency Operation
LCD Backlight to 30mA, Flash to 150mA
Cycle-By-Cycle Current Limit
Independent Backlight, Preview and Flash
Current Adjustment
Special PWM Dimming
Over Voltage Protection
Under Voltage Lockout
Integrated Soft-Start
Thermal Shutdown
Tiny 4mm x 4mm QFN Package
APPLICATIONS
•
•
•
•
PDAs
Cellular Phones
Digital Still Cameras
Digital Video Cameras
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VOUT
VIN
D1
EN1
1
EN2
2
3
C4
10nF
4
9
10
11
6
IN
SW
OUT
(Backlight Mode, 2 Strings of 3 LEDs)
14
82
12
EN1
VIN=4.2V
80
EN2
EFFICIENCY (%)
16
Efficiency vs LED Current
COMP
MP1529
SS
ISET1
LED1
ISET2
LED2
ISET3
LED3
GND
PGND
8
7
VIN=3.6V
78
VIN=2.7V
76
74
5
72
13, 15
GND
2
4
6 8 10 12 14 16 18 20
LED CURRENT (mA)
MP1529_EC01
MP1529_TAC_S01
MP1529 Rev. 1.0
11/23/2005
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1
TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
ABSOLUTE MAXIMUM RATINGS (1)
PACKAGE REFERENCE
IN
PGND
SW
PGND
16
15
14
13
EN1
1
12
OUT
EN2
2
11
ISET3
COMP
3
10
ISET2
SS
4
9
ISET1
5
6
LED3
GND
7
MP1529DR
*
Recommended Operating Conditions
Package
QFN16
(4mm x 4mm)
(2)
Supply Voltage VIN .......................... 2.7V to 5.5V
LED Current (Backlight)............ 30mA Maximum
LED Current (Flash) ............... 150mA Maximum
Operating Temperature .............–40°C to +85°C
Thermal Resistance
8
(3)
θJA
θJC
QFN16 (4mm x 4mm) ............. 60 ...... 12... °C/W
LED2 LED1
EXPOSED PAD
ON BACKSIDE
CONNECT TO PIN 6
Part Number*
VIN ................................................. –0.3V to +6V
VSW, VOUT, VLED1, VLED2, VLED3 .......... –1V to +40V
All Other Pins................................. –0.3V to +6V
Junction Temperature...............................125°C
Lead Temperature ....................................260°C
Storage Temperature ..............–65°C to +150°C
TOP VIEW
PIN 1 ID
MP1529_PD01-QFN16
Temperature
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.
–40°C to +85°C
For Tape & Reel, add suffix –Z (eg. MP1529DR–Z)
For Lead Free, add suffix –LF (eg. MP1529DR–LF–Z)
ELECTRICAL CHARACTERISTICS
VIN = 3.6V, TA = +25°C, unless otherwise noted.
Parameter
Shutdown Supply Current
Supply Current
Under Voltage Lockout
Under Voltage Lockout Hysteresis
OUT Over Voltage Threshold
OUT Leakage Current
ISET1 Backlight Current Gain
ISET2 Preview Current Gain
ISET3 Flash Current Gain
ISET1, ISET2 and ISET3 Voltage
LED1 and LED2 Voltage
LED3 Voltage
SW Switch On Resistance
SW Switch Leakage Current
Symbol Condition
VEN1 = VEN2 = 0V
VEN1 = 3V, VEN2 = 0V, BL
mode without switching
VIN Rising
Min
Typ
0.5
Max
1
Units
µA
1.5
3
mA
2.6
V
mV
V
1
µA
2.0
210
28
VOUT = 28V,
VEN1 = VEN2 = 0V
ILED1,2 = 20mA
ILED3 = 40mA
ILED3 = 100mA
IISET1,2,3 = 20µA
ILED1,2 = 20mA
ILED3 = 100mA
0.95
1.1
1
1.216
440
480
0.25
VEN1 = VEN2 = 0V
VSW = 27V
SW Switch Current Limit
MP1529 Rev. 1.0
11/23/2005
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mA/µA
mA/µA
mA/µA
V
mV
mV
Ω
1
1.2
µA
A
2
TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
ELECTRICAL CHARACTERISTICS (continued)
VIN = 3.6V, TA = +25°C, unless otherwise noted.
Parameter
Current Sense to COMP
Transconductance
Oscillation Frequency
SW Maximum Duty Cycle
EN1, EN2 High Voltage
EN1, EN2 Low Voltage
EN1, EN2 Turn-Off Delay to
Shutdown (4)
EN1 PWM Frequency (4)
Soft-Start Period (4)
Thermal Shutdown
Symbol Condition
Min
∆IC = ±10µA
Typ
Max
200
1.0
1.2
95
µA/V
1.4
1.4
0.3
CSS = 16nF
CSS = 16nF
CSS = 16nF
10
1
MHz
%
V
V
ms
50
10
160
Units
KHz
ms
°C
Note:
4) The soft-start timer and the PWM timer are the same timer with the same timing.
PIN FUNCTIONS
Pin # Name Description
1
EN1 Enable Input. See Table 1 for PWM serial interface usage. EN1 has an internal pull-down of 1.2MΩ.
2
EN2 Enable Input. See Table 1 for PWM serial interface usage. EN2 has an internal pull-down of 1.2MΩ.
Control Loop Compensation Node. COMP is the output of the internal transconductance amplifier.
3
COMP Connect a series resistor-capacitor network between COMP and GND to compensate the control
loop.
4
SS Soft-Start Capacitor Pin. Doubles as the PWM timer.
Number 3 LED String Current Control Input. Connect the bottom (Cathode) of the Number 3 LED
5
LED3
string to LED3. This string is the flash string.
6
GND Analog Ground. (Connect the Exposed Pad to Pin 6)
Number 2 LED String Current Control Input. Connect the bottom (Cathode) of the Number 2 LED
7
LED2
string to LED2. This string is the backlight string.
Number 1 LED String Current Control Input. Connect the bottom (Cathode) of the Number 1 LED
8
LED1
string to LED1. This string is the backlight string.
Current Control Input. Connect a resistor between ISET1 and GND to set the backlight LED string
9
ISET1
current up to 30mA.
Current Control Input. Connect a resistor between ISET2 and GND to set the flash LED string
10 ISET2
preview current up to 150mA.
Current Control Input. Connect a resistor between ISET3 and GND to set the flash LED string current
11 ISET3
up to 150mA.
Output Voltage Sensing Input. When the OUT pin voltage exceeds the overvoltage threshold, the
12
OUT MP1529 automatically shuts down to prevent internal damage. Connect OUT to the output of the
step-up converter.
Switch Output. SW is the drain of the internal N-Channel MOSFET switch. Connect the power
14
SW inductor between SW and the input source, and connect the output rectifier between SW and the
output to form the step-up converter.
16
IN
Input Supply Pin. Must be locally bypassed.
13,15 PGND Power Ground.
MP1529 Rev. 1.0
11/23/2005
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TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit of Figure 2, VIN = 3.6V, 3 LEDs on LED1, 3 LEDs on LED2, 3 LEDs on LED3,
ILED_BL = 20mA, ILED_PV = 40mA, ILED_FL = 100mA, unless otherwise noted.
80
VIN=2.7V
75
70
65
VIN=3.6V
0
5
10
15
ILED_BL(mA)
20
85
VIN=3.6V
80
VIN=2.7V
75
0
5
MP1529-TPC01
15
ILED_BL (mA)
20
90
4 LEDs
3.0
120
30
100
4.0
20
15
0
4.5
10
15
ILED_BL (mA)
20
25
Flash Mode
60
40
Preview Mode
Backlight Mode
0
0
100 200 300 400 500 600 700
2.5
3.0
MP1529-TPC05
Current Matching
LED1 vs. LED2
3.5
VIN (V)
4.0
4.5
MP1529-TPC06
ILED_BL vs. PWM Dimming
Duty Cycle
22
25
LED1
18
20
ILED_BL (mA)
20
ILED_BL (mA)
5
20
MP1529-TPC04
LED2
16
14
12
0
80
10
3.5
VIN (V)
70
35
5
75
2.5
VIN=4.2V
VIN=2.7V
LED Current vs. VIN
ILED (mA)
ILED_BL (mA)
85
VIN=3.6V
75
MP1529-TPC03
25
3 LEDs
80
65
25
LED Current Setting
Backlight Mode
95
EFFICIENCY (%)
10
85
Efficiency vs. LED Current
Backlight Mode,
1 String of 6 LEDs
MP1529-TPC02
Efficiency vs. VIN
Flash Mode
80
VIN=4.2V
70
65
25
Efficiency vs. LED Current
Backlight Mode,
1 String of 4 LEDs
EFFICIENCY (%)
VIN=4.2V
EFFICIENCY (%)
EFFICIENCY (%)
85
Efficiency vs. LED Current
Backlight Mode,
1 String of 3 LEDs
15
10
5
2.5
3.0
3.5
VIN (V)
4.0
4.5
MP1529-TPC07
MP1529 Rev. 1.0
11/23/2005
0
20
40
60
80
DUTY CYCLE (%)
100
MP1529-TPC08
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TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Circuit of Figure 2, VIN = 3.6V, 3 LEDs on LED1, 3 LEDs on LED2, 3 LEDs on LED3,
ILED_BL = 20mA, ILED_PV = 40mA, ILED_FL = 100mA, unless otherwise noted.
Steady State Operation
Backlight Mode
Steady State Operation
Backlight plus Preview Mode
VSW
5V/div.
VSW
5V/div.
VSW
10V/div.
VOUT
AC Coupled
20mV/div.
VOUT
AC Coupled
20mV/div.
IL
0.2A/div.
IL
0.2A/div.
VOUT
AC Coupled
20mV/div.
IL
0.5A/div.
400ns/div.
Steady State Operation
Flash Mode
400ns/div.
MP1529-TPC09
400ns/div.
MP1529-TPC10
MP1529-TPC11
Start-up into Open LEDs
VOUT
10V/div.
VSW
10V/div.
IL
0.5A/div.
1ms/div.
MP1529-TPC12
MP1529 Rev. 1.0
11/23/2005
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TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
BLOCK DIAGRAM
OUT
SW
VIN
PWM
&
OSC
COMP
LED1
--
LED2
--
LED3
-+
VREF
SS
EN1
EN2
SOFT-START/
PWM TIMER
LOGIC
GND
ISET1
ISET2
CURRENT
PROGRAM
ISET3
MP1529_F01_DB01
Figure 1—Functional Block Diagram
MP1529 Rev. 1.0
11/23/2005
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TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
OPERATION
The MP1529 white LED driver performs both
dual string backlight and single string flash
functions for portable applications. The features
include pulse width modulated (PWM) dimming
of the backlight LEDs to 30mA, preview with the
same dimming capability on the backlight
strings and flash only mode to 150mA. Preview
allows the flash LEDs to illuminate the camera
scene such that the correct exposure setting
can be set. The 4mm x 4mm package fits in
most applications.
Startup and Shutdown
EN1 and EN2 are the enables for the backlight
strings and the flash string, respectively. When
the inputs are low, the part is either in shutdown
mode or on the way to shutdown. We will
describe the shutdown behavior later.
Upon enabling the MP1529, the SS pin ramps
its voltage to provide soft-start protection
against supply inrush current. Typically the
ramps last 1ms to 10ms depending on
capacitor selection. EN1 lights up the LED1 and
LED2 strings for the backlight application. The
current setting is 950 times the current in ISET1
for each of the strings. EN1 and EN2 together
turn on the backlight strings and the preview
mode in the flash string. The preview mode
current is 1100 times the current in ISET2. The
final setting depends on the PWM timer, which
is the soft-start timer after the soft-start has
completed and has the same timing.
PWM Brightness Adjust
The PWM timer provides continuous operation
of the flash string and other internal functions
when the PWM low interval of EN1 is shorter
than the PWM timing. Should the EN1 low
interval be longer than the timer interval, the
EN1 pin will assume a steady state low value.
One example: when the PWM is too slow on
EN1, it will result in the part turning off or
entering flash mode depending on the state of
EN2. EN2 uniquely affects this mode by
resetting the PWM timer each time EN2
changes state. This allows a user to make a
transition from preview to flash faster by
MP1529 Rev. 1.0
11/23/2005
passing through the off state. The change in
EN2 resets the PWM and causes the flash to
react immediately. The slower path is to stop
the PWM and make a low transition on EN1 in
the preview mode and to wait for the PWM
timer to clear for flash mode. The time for this
method is that of the PWM timer, which is the
same as the SS timer.
Other features of the 1529 are constant
frequency operation with cycle-by-cycle current
limit as well as over voltage and over
temperature protection.
Open String Protection
There is also open string protection through the
over voltage protection that prevents the 1529
from trying to start an open string indefinitely.
The over voltage signal forces the part to forget
about open LED strings and to resume
regulation on the remaining strings. Initially, any
open string will force the part to pump to its
maximum voltage. At this point, the part will
mark off strings that it simply cannot light
properly. Once the mark-off operation
completes, the remaining LED strings force the
output voltage back into tight regulation. The
string with the highest voltage drop is the ruling
string during output regulation. Once a string is
marked off, its current regulation cannot force
the loop regulation to set the output voltage.
Marked-off LED strings will continue to seek
current regulation and may come into current
regulation if their connections return or improve.
However, the ability to light the string properly
will vary due to the lack of output voltage
control. The part will maintain mark-off
information until the part shuts down or another
LED string opens to force an over voltage
condition. Each time the over voltage condition
is triggered, the part marks off strings according
to their ability to reach current regulation. The
MP1529 will always try to light at least one
string and will ignore the case wherein all the
strings are marked off.
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TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
Table 1—Enable Operation Table (5, 6, 7)
Mode
Off
Backlight
Backlight plus
Preview
Flash
EN1
L
H (PWM)
EN2
L
L
Strings 1 & 2: LCD Backlight LEDs
Off
On (PWM)
String 3: Flash LEDs
Off
Off
H (PWM)
H
On (PWM)
Preview current
L
H
Off
Flash current
Notes:
5) Backlight and Backlight plus Preview may use PWM for backlight brightness control. Only strings 1 & 2 will respond to high speed PWM.
String 3 will remain continuously on or off depending on the mode.
6) Any combination of backlight string may be used. 1 or 2 or 1 & 2 will regulate properly. The part uses over voltage detection to determine
which strings are available to light. The remaining strings are then used for regulation. The part will not remain in an open loop mode if
there is at least one string of LEDs to light.
7) Changing from backlight plus preview to flash will have a delay equal to the soft-start timer due to the PWM filtering necessary for preview.
Switching the part to off mode then to flash will cancel the timer. This will take a few microseconds instead of the 10 milliseconds typically
associated with the timer being active.
APPLICATION INFORMATION
Setting the LED currents
Resistors RS1, RS2 and RS3 set the backlight
LED string (LED1 and LED2) current, the flash
LED string (LED3) preview current, and the
flash LED string current, respectively.
Determine each current setting resistor in kΩ by
the equations:
950 × VSET
RS1 =
ILED _ BL
RS2 =
1100 × VSET
ILED _ PV
RS3 =
1000 × VSET
ILED _ FL
Where VSET is the internal reference voltage,
typically 1.216V. ILED_BL, ILED_PV and ILED_FL are
the backlight LED string current, the flash LED
string preview current, and the flash LED string
flash current in mA, respectively.
Selecting the Input Capacitor
An input capacitor is required to supply the AC
ripple current to the inductor, while limiting
noise at the input source. This capacitor must
have low ESR, so ceramic is the best choice.
MP1529 Rev. 1.0
11/23/2005
Use an input capacitor value of 4.7µF or
greater. This capacitor must be placed
physically close to the IN pin. Since it reduces
the voltage ripple seen at IN, it also reduces the
amount of EMI passed back along that line to
the other circuitry.
Selecting the Output Capacitor
A single 1µF to 4.7µF ceramic capacitor usually
provides sufficient output capacitance for most
applications. The impedance of the ceramic
capacitor at the switching frequency is
dominated by the capacitance, and so the
output voltage ripple is mostly independent of
the ESR. The output voltage ripple VRIPPLE is
calculated as:
VRIPPLE =
ILED (VO UT − VIN )
VO UT × C2 × f SW
Where VOUT is the output voltage, VIN is the
input voltage, ILED is the total LED current, C2 is
the capacitance of the output capacitor, and fSW
is the 1.2MHz switching frequency.
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TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
Selecting the Inductor
The inductor is required to force the output
voltage higher while being driven by the lower
input voltage. Choose an inductor that does not
saturate at the SW current limit.
A good rule for determining the inductance is to
allow the peak-to-peak ripple current to be
approximately 30%-50% of the maximum input
current. The maximum input current usually
occurs in flash mode. Make sure that the peak
inductor current is below 75% of the typical
current limit to prevent loss of regulation due to
the current limit variation.
Calculate the required inductance value L using
the equations:
L=
VIN (VOUT - VIN )
VOUT × fSW × ∆I
IIN(MAX ) =
VOUT × ILED _ FL
VIN × η
∆I = (30% − 50%)IIN(MAX )
Where ∆I is the peak-to-peak inductor ripple
current and η is the efficiency at flash mode. A
4.7µH or 10µH inductor is recommended for
most cell phone applications.
Selecting the Compensation Capacitor
The compensation capacitor needs to be
determined so that the control loop is slow
enough to allow for stable and smooth mode
transition. A 1µF ceramic capacitor is
recommended for most cell phone applications.
Selecting the Soft-Start Capacitor
The soft-start capacitor sets both the soft-start
timer and the PWM timer. A 10nF to 22nF
capacitor
is
recommended
for
most
applications.
Layout Considerations
High frequency switching regulators require
very careful layout for stable operation and low
noise. All components must be placed as close
to the IC as possible. Keep the path between
the SW pin, output diode, output capacitor and
GND pin extremely short for minimal noise and
ringing. The input capacitor must be placed
close to the IN pin for best decoupling. All
current setting resistors must be kept close to
the corresponding ISET pin to prevent noise
injection for accurate LED current setting. The
ground return of the input and output capacitors
should be tied close to the GND pin. See the
MP1529 demo board layout for reference.
Selecting the Diode
The output rectifier diode supplies current to the
inductor when the internal MOSFET is off. To
reduce losses due to diode forward voltage and
recovery time, use a Schottky diode.
Choose a diode whose maximum reverse
voltage rating is greater than the maximum
output voltage. For output voltage less than
20V, it is recommended to choose the
MBR0520 for most applications.
MP1529 Rev. 1.0
11/23/2005
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TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
TYPICAL APPLICATION CIRCUITS
VIN
VOUT
D1
16
EN1
1
EN2
2
3
4
9
10
C4
10nF
11
6
IN
SW
OUT
EN1
14
12
EN2
COMP
MP1529
SS
ISET1
LED1
ISET2
LED2
ISET3
LED3
GND
PGND
8
7
5
13, 15
GND
MP1529_F02_S01
Figure 2— Driving 1 Backlight String (20mA per WLED) and 1 Flash String (40mA Preview,
100mAFlash)
VOUT
VIN
D1
16
EN1
1
EN2
2
3
4
9
10
C4
10nF
11
6
IN
SW
OUT
EN1
14
12
EN2
COMP
SS
MP1529
ISET1
LED1
ISET2
LED2
ISET3
LED3
GND
PGND
8
(A)
7
(A)
5
(B)
13, 15
GND
(A) LCD BACKLIGHT LEDS
(B) FLASH LEDS
MP1529_F03_S01
Figure 3—Driving 2 x 3 Backlight Strings (20mA per WLED) and 1 Flash String (40mA Preview,
100mA Flash)
MP1529 Rev. 1.0
11/23/2005
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TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
TYPICAL APPLICATION CIRCUITS (continued)
VIN
VOUT
D1
16
EN1
1
EN2
2
3
4
9
10
11
C4
10nF
6
IN
14
SW
12
OUT
EN1
EN2
COMP
SS
MP1529
ISET1
LED1
ISET2
LED2
ISET3
LED3
GND
PGND
8
7
5
13, 15
GND
MP1529_F04_S01
Figure 4—Driving 2 x 6 Backlight Strings (20mA per WLED) and 1 Flash String (40mA Preview,
100mAFlash)
PACKAGE INFORMATION
QFN16 (4mm x 4mm)
Pin 1 Dot
By marking
3.950 (0.156)
4.050 (0.159)
0.550 (0.217)
0.650 (0.256)
3.950 (0.156)
4.050 (0.159)
QFN 16L
(4 X 4mm)
Pin 1 Identification
2.35 (0.093)
2.45 (0.097)
16
13
1
0.40 (0.0158)
0.50 (0.0197)
4
0.28 (0.011)
0.38 (0.015)
0.650
BSC
R0.030Max.
9
8
5
2.280 (0.898)
Ref.
Top View
Exposed Pad
(Analog Ground)
Btm View
Side View
0.850 ( 0.0335)
0.950 (0.0374)
0.000-0.025
0.178 (0.007)
0.228 (0.009)
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
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.
MP1529 Rev. 1.0
11/23/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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