MAX8678 Maxim Integrated Products, MAX8678 Datasheet - Page 3

• Manufacturer Part Number: MAX8678
• Description: White LED Charge Pump
• Manufacturer: Maxim Integrated Products

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ELECTRICAL CHARACTERISTICS (continued)
(V
Note 1: Limits are 100% production tested at T
Note 2: Dropout voltage is defined as the LED_ to GND (charge pump inactive) or LED_ to NEG (charge pump active) voltage at
Note 3: Output power is specified by a combination of a functional output current test and characterization analysis.
LED DRIVER
Current-Setting Range
Current Accuracy
LED_ Dropout
LED_ Voltage-Mode Transition Threshold
(1x to 2x)
LED_ Voltage-Mode Transition
Hysteresis
LED_ Leakage in Shutdown
AUDIO AMPLIFIER
Common-Mode Bias Voltage
Output Offset Voltage
Common-Mode Input Voltage
Input Impedance (R
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Output Power
Output Current Limit
Gain Accuracy
Total Harmonic Distortion + Noise
Signal-to-Noise Ratio
Maximum Capacitive Drive
Power-Up from Shutdown Time, t
Shutdown Time, t
IN
= 3.6V, V
which current into LED_ drops 10% from the value at V
GND
PARAMETER
PD
= 0V, T
IN
_______________________________________________________________________________________
)
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
UP
24mA setting, T
24mA setting, T
1.6mA setting, T
24mA setting (Note 2)
V
All LEDs off
V
Table 2
V
f = 1kHz, V
V
200mV
THD+N = 1%,
f = 1kHz (Note 3)
-9dB ≤ Gain ≤ 15dB
Gain = 18dB
R
R
See Figure 3
See Figure 3
LED_
A+
IN
A+
L
L
= 8Ω, f = 1kHz, P
= 8Ω, f = 1kHz, P
A
= 3.2V
= V
= V
= +25°C. Limits over the operating temperature range are guaranteed by design.
falling
P-P
White LED Charge Pump with
A-
A-
= V
= V
at IN
IN
= 3.2V
BIAS
BIAS
A
A
A
= +25°C
= -40°C to +85°C
CONDITIONS
= +25°C
, gain ≤ 12dB
,
LED_
OUT
OUT
= 0.5V.
= 0.25W, V
= 0.25W, V
Charge pump inactive
Charge pump active
T
T
f = 217Hz
f = 1kHz
R
R
R
A
A
L
L
L
= +25°C
= +85°C
= 8Ω, V
= 4Ω, V
= 8Ω, V
1.1W Audio Amplifier
IN
IN
IN
IN
IN
= 3.2V
= 3.2V
= 3.2V
= 3.2V
= 5V
A
= +25°C.) (Note 1)
MIN
0.36
-5%
125
-25
0.1
0.5
0.8
0.6
10
50
-2
-5
V
0.004
TYP
0.01
0.65
132
150
100
IN
104
500
0.1
0.5
1.1
3.5
±1
±5
±1
72
67
60
70
93
90
10
1
/ 2
±0.13
±0.17
(V
MAX
+5%
24.0
+25
1.2)
120
360
175
140
1.6
+2
+5
1
IN
-
UNITS
mA
mV
mV
mV
mV
ms
µA
kΩ
dB
dB
dB
dB
pF
µs
%
W
%
V
A
3