MAX8821 Просмотр технического описания (PDF) - Maxim Integrated
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MAX8821 Datasheet PDF : 29 Pages
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White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
ELECTRICAL CHARACTERISTICS (continued)
(VIN1 = VIN2 = VIN3 = VDD = 3.6V, VAGND = VPGND1 = VPGND2 = 0V, circuit of Figure 2, TA = -40°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
Soft-Start Time
Regulation Voltage
(VIN1 - VNEG)
Open-Loop NEG Output
Resistance
(0.5 x VIN1 - VNEG) / INEG
Output Current
VIN1 = 3.2V, LED VFMAX = 3.9V
NEG Discharge Resistance in
Shutdown
All LEDs disabled
LED_ CURRENT REGULATORS
Current Setting Range
ILED_
TA = +25°C
Current Accuracy
25.6mA setting
TA = -40°C to derating
function start temperature
(enabled by I2C)
0.1mA setting, TA = +25°C
Current-Derating-Function Start
Temperature
Current-Derating-Function Slope
RDS ON
TA = +40°C to +85°C
Charge pump inactive
Charge pump active
Dropout Voltage
Charge pump inactive
25.6mA setting (Note 2)
Charge pump active
Current Regulator
Switchover Threshold
Charge pump inactive to active,
VLED_ falling
Current Regulator
Switchover Hysteresis
Leakage Current in Shutdown
All LEDs
disabled
TA = +25°C
TA = +85°C
00
B7, B6 or B3, B2,
01
Off Blink Time
SYNC = 0,
Table 11
10
11
00
B5, B4 or B1, B0,
01
On Blink Time
SYNC = 0,
Table 11
10
11
LED__RU: B7, B6 or B3, B2
00
Ramp-Up/Down Time
LED__RD: B5, B4 or B1, B0
SYNC = 0,
01
10
Tables 8, 9, 10 (Note 3)
11
MIN TYP MAX UNITS
0.1
ms
5
V
1.75 3.5
Ω
154
mA
10
kΩ
0.1
25.6
mA
-2
±1
+2
-5
+5
%
-30
±5
+30
+40
°C
-1.67
%/°C
2.3
4.6
Ω
5
14
72
120
mV
120
360
125
150
175
mV
100
mV
0.01
1
µA
0.1
524
1048
ms
2097
4194
66
131
ms
262
524
262
524
ms
1048
2097
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