MAX8822 Maxim Integrated Products, MAX8822 Datasheet - Page 3

• Manufacturer Part Number: MAX8822
• Description: Ultra-Efficient Negative Charge-Pump LED Driver
• Manufacturer: Maxim Integrated Products

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ELECTRICAL CHARACTERISTICS (continued)
(V
Note 1: Limits are 100% production tested at T
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 V
Note 5: Guaranteed by design, not production tested.
Note 6: LDO dropout voltage is defined as V
Note 7: LDO output voltage corresponds to the LDO output voltage programmed by pulsing ENLDO low by the given count and
CURRENT REGULATOR (LED1–LED4)
Programmable Current Range
Current Accuracy
LED_ Dropout Voltage
LED_ Current Regulator
Switchover Threshold (Inactive to
Active)
LED_ Current Regulator
Switchover Hysteresis
LED_ Shutdown Leakage Current
LDO_
Output Current
Current Limit
LDO1 Dropout Voltage
LDO2 Dropout Voltage
Line Regulation
Load Regulation
Power-Supply Rejection
ΔV
Output Noise Voltage (RMS)
LDO1 Output Voltage
LDO2 Output Voltage
Ground Current
Shutdown Output Impedance
Driver with Dual LDOs in 3mm x 3mm Thin QFN
IN
OUT
= 3.6V, V
/ΔV
V
then holding ENLDO high for greater than t
IN
PARAMETER
IN
= V
GND
Ultra-Efficient Negative Charge-Pump LED
OUT
= 0V, T
+ 0.8V.
_______________________________________________________________________________________
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
I
I
I
I
V
All LEDs off,
ENLED = GND
(Note 5)
V
I
I
3.4V ≤ V
50µA < I
10Hz to 10kHz, C
100Hz to 100kHz, C
I
I
I
ENLDO = GND
LED
LED
LED
LED
LDO1
LDO2
LDO1
LDO2
LDO
LED_
LDO
_ = 24mA, T
_ = 24mA, T
_ = 0.1mA, T
_ = 24mA (Note 4)
= 500µA
= 0V
= 200mA, V
= 200mA, V
= 100mA (Note 7)
= 100mA (Note 7)
falling
IN
IN
LDO
A
- V
= +25°C. Specifications over the operating temperature range are guaranteed by design.
< 5.5V, I
OUT
< 200mA
HOLD
A
A
A
when V
LDO
LDO1
LDO2
= +25°C
= -40°C to +85°C
= +25°C
LDO
LDO
to set the voltage value. See Figure 2.
CONDITIONS
= 1µF, I
= 2.8V (Notes 5 and 6)
= 2.8V (Notes 5 and 6)
= 100mA
OUT
= 1µF, I
T
T
ENLDO count = 5
ENLDO count = 6, 13
ENLDO count = 1, 3, 7, 9, 14
ENLDO count = 2, 4, 8, 15
ENLDO count = 1, 2
ENLDO count = 3, 4, 10
ENLDO count = 5, 6, 7, 8, 11
ENLDO count = 9, 12
has dropped 100mV below the initial value of V
Charge pump inactive
Charge pump active
A
A
LDO
= +25°C
= +85°C
LDO
= 30mA
= 30mA
A
= +25°C.) (Note 1)
2.716
1.746
MIN
125
200
220
0.1
-2
-3
2.800
1.800
TYP
0.01
150
100
150
300
0.1
0.1
1.2
1.8
3.3
1.2
1.5
2.8
±1
±5
60
80
60
45
50
1
1
OUT
2.884
1.854
when
MAX
24.0
120
250
175
750
250
550
+2
+3
5
LED
mV/mA
= 0.5V.
UNITS
µV
mV/V
mA
mV
mV
mV
mA
mA
mV
mV
dB
kΩ
µA
µA
%
RMS
V
V
3