MP1529 – FIXED FREQUENCY STEP-UP CONVERTER LCD BACKLIGHT PLUS FLASH
MP1529 Rev. 1.2 www.MonolithicPower.com 4
1/22/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit of Figure 2, V
IN
= 3.6V, 3 LEDs on LED1, 3 LEDs on LED2, 3 LEDs on LED3,
I
LED_BL
= 20mA, I
LED_PV
= 40mA, I
LED_FL
= 100mA, unless otherwise noted.
35
30
25
20
15
10
5
0
I
LED_BL
(mA)
I
LED
(mA)
MP1529-TPC05
LED Current Setting
Backlight Mode
2.5 3.0 3.5 4.0 4.5
V
IN
(V)
MP1529-TPC06
LED Current vs. V
IN
25
20
15
10
5
0
20 40 60 80 100
DUTY CYCLE (%)
MP1529-TPC08
I
LED_BL
vs. PWM Dimming
Duty Cycle
Current Matching
LED1 vs. LED2
95
90
85
80
75
22
20
18
16
14
12
120
100
80
60
40
20
0
EFFICIENCY (%)
2.5 3.0 3.5 4.0 4.5
V
IN
(V)
MP1529-TPC04
Efficiency vs. V
IN
Flash Mode
EFFICIENCY (%)
MP1529-TPC03
Efficiency vs. LED Current
Backlight Mode,
1 String of 6 LEDs
V
IN
=3.6V
V
IN
=4.2V
V
IN
=2.7V
EFFICIENCY (%)
MP1529-TPC02
Efficiency vs. LED Current
Backlight Mode,
1 String of 4 LEDs
85
80
75
70
65
85
80
75
70
65
85
80
75
70
65
EFFICIENCY (%)
0 5 10 15 20 25 0 5 10 15 20 25 0 5 10 15 20 25
I
LED_BL
(mA) I
LED_BL
(mA) I
LED_BL
(mA)
MP1529-TPC01
Efficiency vs. LED Current
Backlight Mode,
1 String of 3 LEDs
V
IN
=4.2V
V
IN
=4.2V
V
IN
=2.7V
V
IN
=2.7V
V
IN
=3.6V
V
IN
=3.6V
I
LED_BL
(mA)
I
LED_BL
(mA)
2.5 3.0 3.5 4.0 4.5
V
IN
(V)
MP1529-TPC07
0
100 200 300 400 500 600 700
3 LEDs
4 LEDs
LED1
LED2
Flash Mode
Preview Mode
Backlight Mode
