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MP1529DR-LF-P

P1-P3P4-P6P7-P9P10-P11
MP1529
Fixed Frequency Step-Up Converter
LCD Backlight Plus Flash
MP1529 Rev. 1.2 www.MonolithicPower.com 1
1/22/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP1529 is a step-up converter 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.
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 Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP1529_TAC_S01
MP1529
IN SW
OUT
COMP
SS
ISET1
ISET2
ISET3
GND
LED1
LED2
LED3
PGND
14
12
8
7
5
13, 15
EN1
EN2
16
3
4
9
10
11
6
1
2
D1
V
IN
EN1
EN2
C4
10nF
GND
V
OUT
82
80
78
76
74
72
EFFICIENCY (%)
2 4 6 8 10 12 14 16 18 20
LED CURRENT (mA)
MP1529_EC01
Efficiency vs LED Current
(Backlight Mode, 2 Strings of 3 LEDs)
V
IN
=4.2V
V
IN
=3.6V
V
IN
=2.7V
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
MP1529 Rev. 1.2 www.MonolithicPower.com 2
1/22/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
PACKAGE REFERENCE
MP1529_PD01-QFN16
TOP VIEW
PIN 1 ID
EN1
EN2
COMP
SS
OUT
ISET3
ISET2
ISET1
1
2
3
4
13141516
8765
LED1LED2GNDLED3
PGNDSWPGNDIN
12
11
10
9
EXPOSED PAD
ON BACKSIDE
CONNECT TO PIN 6
Part Number* Package Temperature
MP1529DR
QFN16
(4mm x 4mm)
–40°C to +85°C
*
For Tape & Reel, add suffix –Z (eg. MP1529DR–Z)
For Lead Free, add suffix –LF (eg. MP1529DR–LF–Z)
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
................................................. –0.3V to +6V
V
SW
, V
OUT
, V
LED1
, V
LED2
, V
LED3
.......... –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
Recommended Operating Conditions
(2)
Supply Voltage V
IN
.......................... 2.7V to 5.5V
LED Current (Backlight)............ 30mA Maximum
LED Current (Flash) ...............150mA Maximum
Operating Temperature .............–40°C to +85°C
Thermal Resistance
(3)
θ
JA
θ
JC
QFN16 (4mm x 4mm) ............. 46 ...... 10... °C/W
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
V
IN
= 3.6V, T
A
= +25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Shutdown Supply Current V
EN1
= V
EN2
= 0V 0.5 1 µA
Supply Current
V
EN1
= 3V, V
EN2
= 0V, BL
mode without switching
1.5 3 mA
Under Voltage Lockout V
IN
Rising 2.0 2.6 V
Under Voltage Lockout Hysteresis 210 mV
OUT Over Voltage Threshold 28 V
OUT Leakage Current
V
OUT
= 28V,
V
EN1
= V
EN2
= 0V
1 µA
ISET1 Backlight Current Gain I
LED1,2
= 20mA 0.95 mA/µA
ISET2 Preview Current Gain I
LED3
= 40mA 1.1 mA/µA
ISET3 Flash Current Gain I
LED3
= 100mA 1 mA/µA
ISET1, ISET2 and ISET3 Voltage I
ISET1,2,3
= 20µA 1.216 V
LED1 and LED2 Voltage I
LED1,2
= 20mA 440 mV
LED3 Voltage I
LED3
= 100mA 480 mV
SW Switch On Resistance 0.25
SW Switch Leakage Current
V
EN1
= V
EN2
= 0V
V
SW
= 27V
1 µA
SW Switch Current Limit 1.2 A
Current Sense to COMP
Transconductance
∆I
C
= ±10µA
200 µA/V
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
MP1529 Rev. 1.2 www.MonolithicPower.com 3
1/22/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (continued)
V
IN
= 3.6V, T
A
= +25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Oscillation Frequency 1.0 1.2 1.4 MHz
SW Maximum Duty Cycle 95 %
EN1, EN2 High Voltage 1.4 V
EN1, EN2 Low Voltage 0.3 V
EN1, EN2 Turn-Off Delay to
Shutdown
(4)
C
SS
= 16nF 10 ms
EN1 Start-up Delay to Active Mode 4.8 8 µs
EN1 PWM Frequency
(4)
C
SS
= 16nF 1 50 KHz
Soft-Start Period
(4)
C
SS
= 16nF 10 ms
Thermal Shutdown 160 °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
1.2M.
2 EN2
Enable Input. See Table 1 for PWM serial interface usage. EN2 has an internal pull-down of
1.2M.
3 COMP
Control Loop Compensation Node. COMP is the output of the internal transconductance amplifier.
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.
5 LED3
Number 3 LED String Current Control Input. Connect the bottom (Cathode) of the Number 3 LED
string to LED3. This string is the flash string.
6 GND Analog Ground. (Connect the Exposed Pad to Pin 6)
7 LED2
Number 2 LED String Current Control Input. Connect the bottom (Cathode) of the Number 2 LED
string to LED2. This string is the backlight string.
8 LED1
Number 1 LED String Current Control Input. Connect the bottom (Cathode) of the Number 1 LED
string to LED1. This string is the backlight string.
9 ISET1
Current Control Input. Connect a resistor between ISET1 and GND to set the backlight LED string
current up to 30mA.
10 ISET2
Current Control Input. Connect a resistor between ISET2 and GND to set the flash LED string
preview current up to 150mA.
11 ISET3
Current Control Input. Connect a resistor between ISET3 and GND to set the flash LED string
current up to 150mA.
12 OUT
Output Voltage Sensing Input. When the OUT pin voltage exceeds the overvoltage threshold, the
MP1529 automatically shuts down to prevent internal damage. Connect OUT to the output of the
step-up converter.
14 SW
Switch Output. SW is the drain of the internal N-Channel MOSFET switch. Connect the power
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.
P1-P3P4-P6P7-P9P10-P11

MP1529DR-LF-P

Mfr. #:
Buy MP1529DR-LF-P
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers 2x6 backlight 1x4 flash WLED Driver
Lifecycle:
New from this manufacturer.
Delivery:
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