MAX8821 MAXIM [Maxim Integrated Products], MAX8821 Datasheet - Page 14

• Manufacturer Part Number: MAX8821
• Description: White LED Charge Pump with Mono Class D Audio Amp and Dual LDO
• Manufacturer: MAXIM [Maxim Integrated Products]

White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
14
15–20
______________________________________________________________________________________
PIN
10
11
12
13
14
21
22
23
24
25
26
27
28
—
1
2
3
4
5
6
7
8
9
CMREF
PGND2
PGND1
NAME
AGND
LED1–
LDO2
LDO1
SPK+
LED6
AIN+
SPK-
NEG
AIN-
SDA
C2N
C1N
V
SCL
REF
C2P
C1P
IN2
IN1
IN3
EP
DD
I
control. Drive V
Audio Common-Mode Reference Voltage. Bypass CMREF with a 0.1µF ceramic capacitor to AGND
as close as possible to the IC.
Noninverting Audio Input
Inverting Audio Input
Audio Amplifier Power Ground. Connect PGND2 to the system ground plane.
Audio Amplifier Negative Output
Audio Amplifier Positive Output
Audio Amplifier Output Buffer Supply Voltage Input. The input voltage range is 2.7V to 5.5V. Connect
IN2 directly to IN1 and IN3. Bypass IN2 to PGND2 with a 1µF ceramic capacitor as close as possible
to the IC. IN2 is high impedance during shutdown.
200mA LDO Output. Bypass LDO2 to AGND with a 1µF ceramic capacitor. LDO2 is disabled through
the I
300mA LDO Output. Bypass LDO1 to AGND with a 2.2µF ceramic capacitor. LDO1 is disabled
through the I
I
I
Analog Ground. Connect AGND to the system ground plane. AGND is also internally connected to
the exposed paddle.
Refer ence Byp ass. Byp ass RE F w i th a 0.1µF cer am i c cap aci tor to AG N D as cl ose as p ossi b l e to the IC .
LED Current Regulators. Current flowing into LED_ is based upon the internal I
LED_ to the cathodes of the external LEDs. LED_ is high impedance during shutdown. If unused,
short LED_ to IN1 to disable the regulator.
Charge-Pump Negative Output. Connect a 1µF ceramic capacitor from NEG to AGND. In shutdown,
an internal 10kΩ resistor connects NEG to AGND.
Transfer Capacitor 2 Negative Connection. Connect a 1µF ceramic capacitor from C2P to C2N.
Transfer Capacitor 1 Negative Connection. Connect a 1µF ceramic capacitor from C1P to C1N.
Transfer Capacitor 2 Positive Connection. Connect a 1µF ceramic capacitor from C2P to C2N.
Transfer Capacitor 1 Positive Connection. Connect a 1µF ceramic capacitor from C1P to C1N.
Charge-Pump Supply Voltage Input. The input voltage range is 2.7V to 5.5V. Connect IN1 directly to
IN2 and IN3. Bypass IN1 to PGND1 with a 2.2µF ceramic capacitor as close as possible to the IC.
IN1 is high impedance during shutdown.
Charge-Pump Power Ground. Connect PGND1 to the system ground plane.
Input Voltage Supply for LDO1, LDO2, REF, Class D Preamplifier, and Class D Amplifier Modulator
Core. The input voltage range is 2.7V to 5.5V. Connect IN3 directly to IN1 and IN2. Bypass IN3 to
AGND with a 2.2µF ceramic capacitor as close as possible to the IC. IN3 is high impedance during
shutdown.
Exposed Paddle. Connect the exposed paddle to AGND directly under the IC. Exposed paddle is
internally connected to AGND.
2
2
2
C Input Supply Voltage. The V
C Clock Input. Data is read on the rising edge of V
C Data Input. Data is read on the rising edge of V
2
C interface.
2
C interface.
DD
low to place the IC into shutdown mode.
DD
supply range is 1.5V to 5.5V. Drive V
FUNCTION
SCL.
SCL
.
.
DD
Pin Description
high to enable the I
2
C registers. Connect
2
C