MP1529DR MPS [Monolithic Power Systems], MP1529DR Datasheet - Page 3

• Manufacturer Part Number: MP1529DR
• Description: Fixed Frequency Step-Up Converter LCD Backlight Plus Flash
• Manufacturer: MPS [Monolithic Power Systems]

ELECTRICAL CHARACTERISTICS
V
Note:
4) The soft-start timer and the PWM timer are the same timer with the same timing.
PIN FUNCTIONS
MP1529 Rev. 1.0
11/23/2005
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
EN1 PWM Frequency
Soft-Start Period
Thermal Shutdown
13,15 PGND Power Ground.
Pin # Name Description
IN
10
11
12
14
16
1
2
3
4
5
6
7
8
9
= 3.6V, T
COMP
ISET1
ISET2
ISET3
LED3
LED2
LED1
GND Analog Ground. (Connect the Exposed Pad to Pin 6)
OUT
EN1
EN2
SW
SS
IN
(4)
A
TM
Enable Input. See Table 1 for PWM serial interface usage. EN1 has an internal pull-down of 1.2MΩ.
Enable Input. See Table 1 for PWM serial interface usage. EN2 has an internal pull-down of 1.2MΩ.
Input Supply Pin. Must be locally bypassed.
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.
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
string to LED3. This string is the flash string.
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.
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.
Current Control Input. Connect a resistor between ISET1 and GND to set the backlight LED string
current up to 30mA.
Current Control Input. Connect a resistor between ISET2 and GND to set the flash LED string
preview current up to 150mA.
Current Control Input. Connect a resistor between ISET3 and GND to set the flash LED string current
up to 150mA.
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.
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.
= +25°C, unless otherwise noted.
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
(4)
(4)
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Symbol Condition
© 2005 MPS. All Rights Reserved.
www.MonolithicPower.com
∆I
C
C
C
(continued)
SS
SS
SS
C
= ±10µA
= 16nF
= 16nF
= 16nF
Min
1.0
0.3
1
Typ
200
160
1.2
95
10
10
Max
1.4
1.4
50
Units
µA/V
MHz
KHz
ms
ms
°C
%
V
V
3