User Manual

MAX1578/MAX1579
Complete Bias and White LED Power Supplies
for Small TFT Displays
12 ______________________________________________________________________________________
DESIGNATION
DESCRIPTION
C1, C8
4.7µF, 6.3V X5R ceramic capacitors (0603)
Murata GRM188R60J475KE19
C2
0.1µF, 6.3V X5R ceramic capacitor (0402)
TDK C1005X5R1A104K
C3
0.1µF, 50V X7R ceramic capacitor (0603)
TDK C1608X7R1H104K
C4, C5, C12
1µF, 16V X7R ceramic capacitors (0805)
TDK C2012X7R1C105K
C6, C7
2.2µF, 6.3V X5R ceramic capacitors (0603)
Taiyo Yuden JMK107BJ225KA
C9, C10, C11,
C13, C14
1µF, 6.3V X5R ceramic capacitors (0402)
Murata GRM155R60J105KE19
D1
40V, 0.5A Schottky diode
International Rectifier MBRX0540
D2–D7
White LEDs
Nichia NSCW215T
L1
22µH, 250mA inductor (1210)
Murata LQH32CN220K53
R1 22.1Ω ±1% resistor (0402)
R2, R3 200Ω ±5% resistors (0402)
Table 1. Recommended Components for
the Typical Application Circuit
MAX1578
MAX1579
IN
MAIN
ONBIAS
C1P
C1N
C2P
C2N
GND
CTRL
COMP
V
DD
OUT
PGND
LX
INPUT
2.7V TO 5.5V
L1
22µH
MAIN OUTPUT
+5V, 25mA
PWM OR
ANALOG
DIMMING
OUTPUT UP TO
8 LEDS IN SERIES
CS
ON
OFF
D2–D7
D1
C2
0.1µF
C9
1µF
C6
2.2µF
C7
2.2µF
C8
4.7µF
C1
4.7µF
C3
0.1µF
POSITIVE OUTPUT
+15V, 100µA
POS
CU3
NEG
NEGATIVE OUTPUT
-10V, 100µA
C4
1µF
C5
1µF
C12
1µF
R1
22.1Ω
CU1
PMP
CD1
C10
1µF
C13
1µF
R2
200Ω
CU2
PMPB
CD2
C11
1µF
C14
1µF
R3
200Ω
Figure 3. Typical Application Circuit