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