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White LED Charge Pump with
1.1W Audio Amplifier
Typical Operating Characteristics (continued)
(V IN = 3.2V, R L = 8 Ω , T A = +25°C, unless otherwise noted.)
LINE TRANSIENT WITH MODE
LED SINGLE-WIRE PULSE DIMMING
MAX8678 toc16
TRANSITION
MAX8678 toc17
V ENLED
5V/div
V IN
3.8V
3.8V
1V/div
3.4V
I LED
20mA/div
I LED
(TOTAL)
I IN
100mA/div
200mA/div
4 LEDs AT 24mA EACH
200ms/div
200 μ s/div
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
IN
GND
A+
A-
ENAMP
OUT+
OUT-
BIAS
FUNCTION
Analog Supply-Voltage Input. The input voltage range is 2.7V to 5.5V. Connect a 4.7μF ceramic
capacitor from IN to GND as close as possible to the IC. IN is high impedance during shutdown.
Ground. Connect GND to the system ground plane. Do not connect GND to the exposed paddle.
Noninverting Differential Audio Input
Inverting Differential Audio Input
Amplifier Enable and Gain Control. ENAMP is a serial-pulse interface logic input to control on/off and
gain settings of the audio amplifier.
Audio Amplifier Positive Output
Audio Amplifier Negative Output
DC Bias Bypass. Connect a 0.1μF ceramic capacitor from BIAS to GND as close as possible to the IC.
LED Current Regulators. Current flowing into LED_ is regulated to the current programmed by the
9–12
LED1–LED4 serial-pulse interface. Connect LED_ to the cathodes of the corresponding external LEDs. LED_ is high
impedance during shutdown. If unused, connect LED_ to IN to disable the regulator.
13
14
15
16
—
NEG
C-
C+
ENLED
EP
Charge-Pump Negative Output. Connect a 1μF ceramic capacitor from NEG to GND. In shutdown, an
internal 10k Ω resistor pulls NEG to GND.
Transfer Capacitor Negative Connection. Connect a 1μF ceramic capacitor from C+ to C-.
Transfer Capacitor Positive Connection. Connect a 1μF ceramic capacitor from C+ to C-.
LED Enable and Dimming Control. ENLED is a serial-pulse interface logic input to control on/off and
dimming of the LED regulators.
Exposed Paddle. Connect the exposed paddle to NEG directly under the IC.
6
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