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MAX8678ETE+T

P1-P3P4-P6P7-P9P10-P12P13-P13
MAX8678
White LED Charge Pump with
1.1W Audio Amplifier
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V
IN
= 3.2V, R
L
= 8Ω, T
A
= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
MAX8678 toc01
FREQUENCY (Hz)
THD+N (%)
10,0001000100
0.01
10 100,000
0.1
0.001
OUTPUT POWER = 150mW
OUTPUT POWER = 50mW
OUTPUT POWER = 300mW
GAIN = 3dB
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
MAX8678 toc02
OUTPUT POWER (W)
THD+N (%)
0.80.60.40.2
0.01
0.1
1
10
100
0.001
0 1.0
f
IN
= 1kHz
f
IN
= 10kHz
f
IN
= 100kHz
GAIN = 3dB
2000
1000
0
2.5 3.5 4.5 5.5
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX8678 toc03
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
THD+N = 10%
THD+N = 1%
0
0.4
0.2
0.8
0.6
1.0
1.2
48106 121416
OUTPUT POWER vs. LOAD RESISTANCE
MAX8678 toc05
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
THD+N = 10%
THD+N = 1%
FREQUENCY (Hz)
AMPLIFIER GAIN AND PHASE
vs. FREQUENCY
25dB
20dB
15dB
10dB
5dB
0dB
0°
-30°
-60°
-90°
MAX8678 toc06
GAIN = 18dB
10 100 1k 10k 100k
AMPLIFIER GAIN AND PHASE
FREQUENCY (Hz)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
-25dB
-35dB
-45dB
-55dB
-65dB
-75dB
-85dB
-95dB
MAX8678 toc07
GAIN = 18dB
V
RIPPLE
100mV
P-P
100 1k 10k
REJECTION RATIO
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-25dB
-35dB
-45dB
-55dB
-65dB
-75dB
-85dB
-95dB
-105dB
-125dB
MAX8678 toc08
GAIN = 18dB
V
RIPPLE
18mV
P-P
100 1k 10k
REJECTION RATIO
4ms/div
AMPLIFIER STARTUP
AND SHUTDOWN
V
OUT+
V
OUT-
V
OUT+
- V
OUT-
MAX8678 toc09
V
ENAMP
2V/div
100mV/div
1V/div
1V/div
MAX8678
White LED Charge Pump with
1.1W Audio Amplifier
_______________________________________________________________________________________
5
0
30
20
10
40
50
60
70
80
90
100
2.7 3.33.0 3.6 3.9 4.2
LED EFFICIENCY vs. SUPPLY VOLTAGE
(MISMATCHED LEDs)
MAX8678 toc10
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
4 x 1.6mA
4 x 6.4mA
4 x 20.8mA
0
60
40
20
80
100
120
140
160
180
200
4.2 3.63.9 3.3 3.0 2.7
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(MISMATCHED LEDs)
MAX8678 toc11
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
4 x 16mA
4 x 20.8mA
4 x 6.4mA
4 x 1.6mA
0
30
20
10
40
50
60
70
80
90
100
2.7 3.33.0 3.6 3.9 4.2
LED EFFICIENCY vs. SUPPLY VOLTAGE
(MATCHED LEDs)
MAX8678 toc12
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
20.4mA/LED
16.4mA/LED
6.4mA/LED
1.6mA/LED
40
60
50
80
70
90
100
4.20
3.90
3.85
3.80
3.75
3.70
3.65
3.60
3.55
3.50
3.40
3.00
MAX8678 EFFICIENCY vs. SUPPLY VOLTAGE
(MATCHED LEDs)
MAX8678 toc13
SUPPLY VOLTAGE, TIME WEIGHTED (V)
EFFICIENCY
1.6mA/LED
6.4mA/LED
16.4mA/LED
20.4mA/LED
15.0
15.6
15.4
15.2
15.8
16.0
16.2
16.4
16.6
16.8
17.0
2.7 3.33.0 3.6 3.9 4.2
LED CURRENT MATCHING
vs. SUPPLY VOLTAGE
MAX8678 toc14
SUPPLY VOLTAGE (V)
LED CURRENT (mA)
4 OF 16mA/LED
1ms/div
LED STARTUP/
SHUTDOWN WAVEFORMS
V
ENLED
V
LED1
MAX8678 toc15
I
IN
500mA/div
1V/div
2V/div
Typical Operating Characteristics (continued)
(V
IN
= 3.2V, R
L
= 8Ω, T
A
= +25°C, unless otherwise noted.)
MAX8678
White LED Charge Pump with
1.1W Audio Amplifier
6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1IN
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.
2 GND Ground. Connect GND to the system ground plane. Do not connect GND to the exposed paddle.
3 A+ Noninverting Differential Audio Input
4 A- Inverting Differential Audio Input
5 ENAMP
Amplifier Enable and Gain Control. ENAMP is a serial-pulse interface logic input to control on/off and
gain settings of the audio amplifier.
6 OUT+ Audio Amplifier Positive Output
7 OUT- Audio Amplifier Negative Output
8 BIAS DC Bias Bypass. Connect a 0.1µF ceramic capacitor from BIAS to GND as close as possible to the IC.
9–12 LED1–LED4
LED Current Regulators. Current flowing into LED_ is regulated to the current programmed by the
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 NEG
Charge-Pump Negative Output. Connect a 1µF ceramic capacitor from NEG to GND. In shutdown, an
internal 10kΩ resistor pulls NEG to GND.
14 C- Transfer Capacitor Negative Connection. Connect a 1µF ceramic capacitor from C+ to C-.
15 C+ Transfer Capacitor Positive Connection. Connect a 1µF ceramic capacitor from C+ to C-.
16 ENLED
LED Enable and Dimming Control. ENLED is a serial-pulse interface logic input to control on/off and
dimming of the LED regulators.
— EP Exposed Paddle. Connect the exposed paddle to NEG directly under the IC.
Typical Operating Characteristics (continued)
(V
IN
= 3.2V, R
L
= 8Ω, T
A
= +25°C, unless otherwise noted.)
200ms/div
LED SINGLE-WIRE PULSE DIMMING
V
ENLED
I
LED
MAX8678 toc16
20mA/div
5V/div
200μs/div
LINE TRANSIENT WITH MODE
TRANSITION
V
IN
I
LED
(TOTAL)
MAX8678 toc17
I
IN
200mA/div
100mA/div
1V/div
3.8V
3.4V
3.8V
4 LEDs AT 24mA EACH
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX8678ETE+T

Mfr. #:
Buy MAX8678ETE+T
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers White LED Charge Pump w/1.1W Aud Amp
Lifecycle:
New from this manufacturer.
Delivery:
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