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High-Efficiency, White LED Step-Up Converter
with I 2 C Interface in 2mm x 2mm WLP
Table 11. STAT2 Register
(Address 0x2E)
Table 12. CHIP_ID1 Register
(Address: 0x39)
BIT
NAME
DESCRIPTION
BIT
NAME
DESCRIPTION
B7 (MSB)
Reserved for future use
B7 (MSB)
B6
B5
B4
B3
B2
OSDD
Reserved for future use
Reserved for future use
Reserved for future use
Reserved for future use
Open Schottky diode detection
0 = Schottky diode is present
B6
B5
B4
B3
B2
B1
B0 (LSB)
DIE_TYPE[7:4]
DIE_TYPE[3:0]
BCD character 0
BCD character 7
1 = Schottky diode is missing
Thermal-shutdown detection
0 = No thermal shutdown occurred
Table 13. CHIP_ID2 Register
(Address 0x3A)
B1
TSD
1 = MAX8831 has entered thermal
shutdown since the last read
operation of this register
Output overvoltage detection
0 = No overvoltage protection has
BIT
B7 (MSB)
B6
B5
NAME
DASH [7:4]
DESCRIPTION
BCD character 0
B0 (LSB)
OVP
occurred
1 = MAX8831 has entered over
voltage protection since last read
B4
B3
operation of this register
PCB Layout
B2
B1
B0 (LSB)
MASK_REV [3:0]
BCD character B
Due to fast switching waveforms and high current
paths, careful PCB layout is required. Minimize trace
lengths between the IC and the inductor, the diode, the
input capacitor, and the output capacitor. Minimize
Table 14. Recommended Inductors for
the MAX8831 Circuit
trace lengths between the input and output capacitors
and the MAX8831 GND terminal, and place input and
output capacitor grounds as close together as possi-
ble. Use separate power ground and analog ground
copper areas, and connect them together at the output
capacitor ground. Keep traces short, direct, and wide.
Keep noisy traces, such as the LX node trace, away
from sensitive analog circuitry. For improved thermal
performance, maximize the copper area of the LX and
PGND traces. Refer to the MAX8831 EV Kit for an
example layout.
PART
TOKO 1098AS-100M
TOKO 1069AS-220M
FDK MIP3226D100M
Coilcraft EPL2014-
472ML
Coilcraft DO2010-
472ML
L
(μH)
10
22
10
4.7
4.7
DCR
(m Ω )
290
570
160
231
800
I SAT
(A)
0.75
0.47
0.9
650
650
SIZE (mm)
2.8 x 3.0 x 1.2
3 x 3 x 1.8
3.2 x 2.6 x 1.0
2.0 x 2.0 x 1.45
2.0 x 2.0 x 1.0
24
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