MAX8822 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8822
Maxim Integrated
MAX8822 Datasheet PDF : 15 Pages
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Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3.6V, VGND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
CURRENT REGULATOR (LED1–LED4)
Programmable Current Range
Current Accuracy
ILED_ = 24mA, TA = +25°C
ILED_ = 24mA, TA = -40°C to +85°C
LED_ Dropout Voltage
ILED_ = 0.1mA, TA = +25°C
ILED_ = 24mA (Note 4)
Charge pump inactive
Charge pump active
LED_ Current Regulator
Switchover Threshold (Inactive to VLED_ falling
Active)
LED_ Current Regulator
Switchover Hysteresis
LED_ Shutdown Leakage Current
LDO_
All LEDs off,
ENLED = GND
TA = +25°C
TA = +85°C
Output Current
(Note 5)
Current Limit
VLDO = 0V
LDO1 Dropout Voltage
LDO2 Dropout Voltage
Line Regulation
Load Regulation
ILDO1 = 200mA, VLDO1 = 2.8V (Notes 5 and 6)
ILDO2 = 200mA, VLDO2 = 2.8V (Notes 5 and 6)
3.4V ≤ VIN < 5.5V, ILDO = 100mA
50µA < ILDO < 200mA
Power-Supply Rejection
ΔVOUT/ΔVIN
Output Noise Voltage (RMS)
10Hz to 10kHz, CLDO = 1µF, ILDO = 30mA
100Hz to 100kHz, CLDO = 1µF, ILDO = 30mA
ENLDO count = 5
LDO1 Output Voltage
ENLDO count = 6, 13
ILDO1 = 100mA (Note 7) ENLDO count = 1, 3, 7, 9, 14
ENLDO count = 2, 4, 8, 15
ENLDO count = 1, 2
LDO2 Output Voltage
ENLDO count = 3, 4, 10
ILDO2 = 100mA (Note 7) ENLDO count = 5, 6, 7, 8, 11
ENLDO count = 9, 12
Ground Current
ILDO = 500µA
Shutdown Output Impedance
ENLDO = GND
MIN
0.1
-2
-3
125
200
220
2.716
1.746
TYP
±1
±5
60
80
150
100
0.01
0.1
150
300
1
0.1
60
45
1.2
1.8
2.800
3.3
1.2
1.5
1.800
2.8
50
1
MAX UNITS
24.0
mA
+2
+3
%
120
mV
250
175
mV
mV
5
µA
mA
750
mA
250
mV
550
mV
mV/V
mV/mA
dB
µVRMS
V
2.884
V
1.854
µA
kΩ
Note 1: Limits are 100% production tested at TA = +25°C. Specifications over the operating temperature range are guaranteed by design.
Note 2: Hold EN_ low for at least 2.5ms to guarantee shutdown.
Note 3: Hold EN_ high for at least 2.5ms to latch EN count.
Note 4: LED dropout voltage is defined as the LED_ to GND voltage when current into LED_ drops 10% from the value at VLED = 0.5V.
Note 5: Guaranteed by design, not production tested.
Note 6: LDO dropout voltage is defined as VIN - VOUT when VOUT has dropped 100mV below the initial value of VOUT when
VIN = VOUT + 0.8V.
Note 7: LDO output voltage corresponds to the LDO output voltage programmed by pulsing ENLDO low by the given count and
then holding ENLDO high for greater than tHOLD to set the voltage value. See Figure 2.
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