MAX8678 Maxim Integrated Products, MAX8678 Datasheet
MAX8678
Manufacturer Part Number
MAX8678
Description
White LED Charge Pump
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8678.pdf
(13 pages)
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Part Number:
MAX8678ETE
Manufacturer:
MAXIM
Quantity:
392
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Part Number:
MAX8678ETE+T
Manufacturer:
HIROSE
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The MAX8678 integrates a charge pump for white light-
emitting diodes (LEDs) with an audio loudspeaker
amplifier. The high-efficiency, adaptive charge pump
drives up to four LEDs with constant current for uniform
brightness. The LED current is adjustable from
0.1mA/LED to 24mA/LED in 31 pseudo-logarithmic
steps through a single-wire serial-pulse interface. High
accuracy and LED-to-LED current matching are main-
tained throughout the adjustment range. Individual
adaptive mode switching for each LED provides high
efficiency with a wide range of LED forward voltages.
The mono class AB audio amplifier directly drives an 8Ω
loudspeaker with 1.1W RMS continuous power from a 5V
supply with less than 1% THD+N. The gain is adjustable
from -9dB to +18dB in ten 3dB steps through a single-
wire serial-pulse interface. Clicks and pops are sup-
pressed during on/off and all gain adjustments.
Differential inputs improve common-mode noise rejection.
The MAX8678 includes soft-start, thermal shutdown,
open-circuit and short-circuit protection, and is avail-
able in the 16-pin, 3mm x 3mm Thin QFN package
(0.8mm max height).
19-0786; Rev 0; 4/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
DIFFERENTIAL
2.7V TO 5.5V
AND DIMMING
AMP ON/OFF
LED ON/OFF
AND GAIN
INPUT
Cell Phones and Smartphones
Camera Phones
PDAs, Digital Cameras, Camcorders
AUDIO
INPUT
4.7μF
Typical Operating Circuit
IN
ENLED
ENAMP
GND
A+
A-
________________________________________________________________ Maxim Integrated Products
C+
EP
MAX8678
General Description
1μF
NEG
C-
OUT+
LED1
LED2
LED3
LED4
OUT-
BIAS
1μF
Applications
0.1μF
LOUDSPEAKER
8Ω
0.1mA TO
24mA
BACKLIGHT
OR FLASH
White LED Charge Pump with
♦ High-Efficiency White LED Charge Pump
♦ Mono Class AB Audio Amplifier
♦ Soft-Start Limits Inrush Current
♦ Thermal Shutdown, Open- and Short-Circuit
♦ 16-Pin, 3mm x 3mm Thin QFN Package
+ Denotes a lead-free package.
Note: The device is specified over the -40°C to +85°C extend-
ed temperature range.
MAX8678ETE+
Protection
TOP VIEW
PART
1.1W Audio Amplifier
Individual Adaptive Supply for Each LED
4 Low-Dropout LED Current Regulators
24mA to 0.1mA Dimming Range
Single-Wire, Serial-Pulse Dimming Interface
1% (typ) Accuracy
Low 140µA Quiescent Current
1.1W RMS Mono BTL Output (8Ω, V
Low 0.004% THD+N at 1kHz
High 90dB PSRR at 1kHz
Fully Differential Inputs
-9dB to +18dB Gain Settings in 3dB Steps
Integrated Click/Pop Suppression
Low Quiescent Current
ENLED
NEG
C+
C-
13
14
15
16
PIN-PACKAGE
16 Thin QFN
3mm x 3mm
+
12
1
Ordering Information
3mm × 3mm
THIN QFN
MAX8678
11
2
Pin Configuration
10
3
TOP MARK
AFF
9
4
Features
IN
8
7
6
5
= 5V)
PKG CODE
BIAS
OUT-
OUT+
ENAMP
T1633-5
1
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