1x/1.5x/2x White LED Charge Pump with
Two LDOs in 4mm x 4mm Thin QFN
Table 3. Recommended Components for Figure 1
DESIGNATION
C1, C5
C3, C4, C6, C7
C8
D1–D4
D5 (D5–D8)
RSETM, RSETF
VALUE
10µF
1µF
0.01µF
—
—
As
Required
MANUFACTURER
TDK
TDK
TDK
Nichia
Nichia
Panasonic
Vishay
PART NUMBER
C2012X5R0J106M
C1005X5R0J105M
C1005X7R1E103K
NSCW215T
NBCW011T
—
DESCRIPTION
10µF ±20%, 6.3V X5R ceramic capacitors (0805)
1µF ±20%, 6.3V X5R ceramic capacitors (0402)
0.01µF ±10%, 25V X7R ceramic capacitor (0402)
White LEDs
White LEDs, 4 LEDs in one package
1% resistor
PC Board Layout and Routing
The MAX8631X/Y is a high-frequency switched-capaci-
tor voltage regulator. For best circuit performance, use
a solid ground plane and place CIN, COUT, C3, and C4
as close to the MAX8631X/Y as possible. There should
be no vias on CIN. Connect GND and PGND to the
exposed paddle directly under the IC. Refer to the
MAX8631X/Y evaluation kit for an example.
PROCESS: BiCMOS
Chip Information
TOP VIEW
Pin Configuration
21 20 19 18 17 16 15
C1N 22
C1P 23
PGND 24
OUT 25
C2P 26
MAX8631XETI
MAX8631YETI
C2N 27
P1 28
+1 2 3 4 5 6 7
14 M3
13 M4
12 F1
11 F2
10 F3
9 F4
8 SETM
THIN QFN
4mm x 4mm, 0.4mm LEAD PITCH
14 ______________________________________________________________________________________