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PDF MP1529 Data sheet ( Hoja de datos )
| Número de pieza | MP1529 | |
| Descripción | Fixed Frequency Step-Up Converter LCD Backlight Plus Flash | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP1529 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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TM
The Future of Analog IC Technology TM
DESCRIPTION
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.
MP1529
Fixed Frequency Step-Up Converter
LCD Backlight Plus Flash
FEATURES
• 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
VIN
D1
EN1
EN2
C4
10nF
GND
16 IN
1
EN1
14
SW
12
OUT
2
EN2
3
COMP
4 SS MP1529
9 ISET1
8
LED1
10 ISET2
7
LED2
11 ISET3
5
LED3
6 GND
PGND 13, 15
VOUT
MP1529_TAC_S01
Efficiency vs LED Current
(Backlight Mode, 2 Strings of 3 LEDs)
82
80 VIN=4.2V
78 VIN=3.6V
76 VIN=2.7V
74
72
2 4 6 8 10 12 14 16 18 20
LED CURRENT (mA)
MP1529_EC01
MP1529 Rev. 1.0
11/23/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
1 page  
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
Steady State Operation
Backlight plus Preview Mode Flash Mode
VSW
5V/div.
VOUT
AC Coupled
20mV/div.
IL
0.2A/div.
VSW
5V/div.
VOUT
AC Coupled
20mV/div.
IL
0.2A/div.
400ns/div.
MP1529-TPC09
VSW
10V/div.
VOUT
AC Coupled
20mV/div.
IL
0.5A/div.
400ns/div.
MP1529-TPC10
400ns/div.
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
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5
5 Page 
TM
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
TYPICAL APPLICATION CIRCUITS (continued)
VIN
D1
EN1
EN2
GND
C4
10nF
16
IN
14
SW
1 EN1
12
OUT
2 EN2
3
COMP
4 SS MP1529
9 ISET1
8
LED1
10
ISET2
7
LED2
11
ISET3
5
LED3
6 GND
PGND 13, 15
VOUT
MP1529_F04_S01
Figure 4—Driving 2 x 6 Backlight Strings (20mA per WLED) and 1 Flash String (40mA Preview,
100mAFlash)
PACKAGE INFORMATION
Pin 1 Dot
By marking
3.950 (0.156)
4.050 (0.159)
3.950 (0.156)
4.050 (0.159)
QFN 16L
(4 X 4mm)
Top View
QFN16 (4mm x 4mm)
0.550 (0.217)
0.650 (0.256)
2.35 (0.093)
2.45 (0.097)
13 16
0.650
BSC
9
R0.030Max.
85
2.280 (0.898)
Ref.
Btm View
Pin 1 Identification
0.40 (0.0158)
1 0.50 (0.0197)
4 0.28 (0.011)
0.38 (0.015)
Exposed Pad
(Analog Ground)
0.850 ( 0.0335)
0.950 (0.0374)
Side View
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.
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MP1529.PDF ] | |
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