MP1529DR MPS [Monolithic Power Systems], MP1529DR Datasheet - Page 4

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

TYPICAL PERFORMANCE CHARACTERISTICS
Circuit of Figure 2, V
I
MP1529 Rev. 1.0
11/23/2005
LED_BL
= 20mA, I
22
20
18
16
14
12
85
80
75
70
65
95
90
85
80
75
2.5
2.5
0
Efficiency vs. LED Current
Backlight Mode,
1 String of 3 LEDs
Efficiency vs. V
Flash Mode
Current Matching
LED1 vs. LED2
3 LEDs
V
TM
IN
5
3.0
3.0
MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
=3.6V
4 LEDs
LED_PV
I
LED_BL
10
V
V
IN
IN
3.5
3.5
(V)
(V)
V
(mA)
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
IN
IN
15
= 40mA, I
=4.2V
= 3.6V, 3 LEDs on LED1, 3 LEDs on LED2, 3 LEDs on LED3,
IN
V
4.0
4.0
IN
LED1
LED2
20
=2.7V
MP1529-TPC01
MP1529-TPC04
MP1529-TPC07
4.5
4.5
25
LED_FL
85
80
75
70
65
25
20
15
10
35
30
25
20
15
10
= 100mA, unless otherwise noted.
© 2005 MPS. All Rights Reserved.
5
0
5
0
0
0
I
Duty Cycle
Efficiency vs. LED Current
Backlight Mode,
1 String of 4 LEDs
LED Current Setting
Backlight Mode
LED_BL
www.MonolithicPower.com
100 200 300 400 500 600 700
20
5
DUTY CYCLE (%)
vs. PWM Dimming
V
I
LED_BL
40
IN
10
V
=3.6V
IN
=2.7V
(mA)
60
15
V
80
IN
20
MP1529-TPC02
MP1529-TPC05
MP1529-TPC08
=4.2V
100
25
120
100
80
60
40
20
85
80
75
70
65
0
2.5
0
Efficiency vs. LED Current
Backlight Mode,
1 String of 6 LEDs
LED Current vs. V
5
3.0
I
LED_BL
10
V
V
IN
3.5
IN
=3.6V
(V)
Backlight Mode
(mA)
Preview Mode
15
Flash Mode
V
4.0
IN
IN
20
MP1529-TPC03
MP1529-TPC06
=4.2V
4.5
25
4