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White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Table 16. PUMP_CNTL (Address 0x0E)
Applications Information
BIT
B7–B3
B2
NAME
N/A, do not use
TEMP_DR
CODE
0
1
DESCRIPTION
Temperature
derating disabled.
Temperature derating
enabled.
PCB Layout
PCB layout is essential for optimizing performance. Use
large traces for the power-supply inputs and amplifier
outputs to minimize losses due to parasitic trace resis-
tance and to route heat away from the device. To avoid
potential noise to the differential input audio signal and
differential output audio signal, route the negative and
Charge pump
positive traces in parallel. Also, avoid placing any RF or
00
automatically
changes between
high-speed data signals in parallel to the audio signals.
In some applications, such as GSM, extra noise reduc-
B1, B0
PUMP_CNTL [1:0]
01
10
1x/1.5x mode.
Charge pump is
forced into 1.5x mode
regardless of input
voltage.
Charge pump is
forced into 1.5x mode
regardless of input
voltage when audio
amplifier is enabled. If
the amplifier is not
enabled, the charge
tion may be needed. To reduce the risk of noise, place
16pF ceramic capacitors from AIN+ to AGND, AIN- to
AGND, OUT+ to AGND, OUT- to AGND, OUT+ to OUT-,
and AIN+ to AIN-.
Proper grounding improves audio performance and
prevents any digital switching noise from coupling into
the audio signal. The Thin QFN package features an
exposed thermal paddle on its undersides. This paddle
lowers the thermal resistance of the package by provid-
ing a direct-heat conduction path from the die to the
PCB. Connect the exposed paddle to AGND directly
under the IC. Refer to the MAX8821 Evaluation Kit for
pump automatically
switches between 1x
mode and 1.5x mode.
an example of a PCB layout.
Note: Defaults in bold italics.
11
N/A, do not use.
TOP VIEW
Pin Configuration
PROCESS: BiCMOS
Chip Information
21
20
19
18
17
16
15
C2N 22
C1N 23
C2P 24
14
13
12
REF
AGND
SDA
C1P 25
IN1 26
PGND1 27
MAX8821ETI+
11
10
9
SCL
LDO1
LDO2
EP = EXPOSED PADDLE
IN3 28
8
IN2
+
1
2
3
4
5
6
7
______________________________________________________________________________________
27
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