MAX8821 MAXIM [Maxim Integrated Products], MAX8821 Datasheet - Page 8

• Manufacturer Part Number: MAX8821
• Description: White LED Charge Pump with Mono Class D Audio Amp and Dual LDO
• Manufacturer: MAXIM [Maxim Integrated Products]

ELECTRICAL CHARACTERISTICS (continued)
(V
Typical values are at T
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Note 1: Limits are 100% production tested at T
Note 2: Dropout voltage is defined as the LED_ to GND voltage when the current into LED_ drops 10% from the value at V
Note 3: Ramp-up time is from 0mA to full scale; ramp-down time is from full scale to 0mA.
Note 4: Output power is specified by a combination of a functional output current test and characterization analysis.
Note 5: The dropout voltage is defined as V
(V
8
SDA Hold Time
SDA Setup Time
Setup Time for STOP
Condition
IN1
IN1
100
250
225
200
175
150
125
100
90
80
70
60
50
40
30
20
10
75
50
25
_______________________________________________________________________________________
0
0
PARAMETER
= V
= V
2.7
vs. SUPPLY VOLTAGE (DRIVING SIX LEDs)
2.7
1.6mA/LED
LEDs HAVE HIGH MISMATCHED V
applies when V
EFFICIENCY vs. SUPPLY VOLTAGE
IN2
I
IN2
LED
I
LED
= 1.6mA
= V
3.0
= V
= 6.4mA
I
LED
6.4mA/LED
(DRIVING SIX LEDS)
SUPPLY CURRENT
IN3
IN3
SUPPLY VOLTAGE (V)
= 16mA
SUPPLY VOLTAGE (V)
3.2
3.3
= V
= V
LEDs HAVE MATCHED V
16mA/LED
A
DD
DD
OUT
= +25°C.) (Note 1)
t
t
t
3.6
HD_DAT
SU_DAT
SU_STO
= 3.6V, V
= 3.6V, V
I
3.7
≥ 3.0V.
LED
20.8mA/LED
F
= 20.8mA
3.9
AGND
AGND
F
4.2
4.2
= V
= V
IN_
PGND1
PGND1
A
- V
100
90
80
70
60
50
40
30
20
10
70
60
50
40
30
20
10
= +25°C. Limits over the operating temperature range are guaranteed by design.
0
0
OUT
2.7
2.7
= V
CONDITIONS
= V
vs. SUPPLY VOLTAGE (RGB MODULE)
RGB MODULE: LUMEX SML-LX3632SISUGSBC
EFFICIENCY vs. SUPPLY VOLTAGE
1.6mA/LED
when V
LED CHARGE PUMP
PGND2
PGND2
I
I
LED
LED
3.0
I
= 1.6mA
= 6.4mA
(DRIVING SIX LEDS)
LED
6.4mA/LED
SUPPLY CURRENT
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
3.2
OUT
= 16mA
= 0V, circuit of Figure 2, T
= 0V, circuit of Figure 2, T
LEDs HAVE MISMATCHED V
3.3
16mA/LED
is 100mV below the nominal value of V
3.6
Typical Operating Characteristics
3.7
I
LED
20.8mA/LED
3.9
= 20.8mA
F
4.2
4.2
A
A
= -40°C to +85°C, unless otherwise noted.
= +25°C, unless otherwise noted.)
16.5
16.4
16.3
16.2
16.1
16.0
15.9
15.8
15.7
15.6
15.5
100
90
80
70
60
50
40
4.2
2.7
EFFICIENCY vs. Li+ BATTERY VOLTAGE
MIN
100
0.6
LEDs HAVE HIGH MATCHED V
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
1.6mA/LED
0
3.9
vs. SUPPLY VOLTAGE (16mA/LED)
3.1
LED CURRENT MATCHING
20.8mA/LED
6.4mA/LED
3.8
OUT
3.5
DRIVING SIX LEDs
SUPPLY VOLTAGE (V)
-0.01
TYP
0.1
50
. The specification only
3.9
3.7
16mA/LED
CHARGE PUMP IN 1.5x
4.3
MAX
3.6
20.8mA/LED
20.8mA/LED
F
LED_
4.7
3.5 3.4 3.0
= 0.5V.
5.1
UNITS
µs
ns
µs
5.5