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MAX8930
WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
CHG PIN CHARACTERISTICS
PARAMETER
Low-Level Voltage
I CHG = 5mA
CONDITIONS
MIN
TYP
0.05
MAX
0.2
UNITS
V
Leakage Current
V CHG = 3.7V
T A = +25 N C
T A = +85 N C
0.1
1
1
F A
Note
Note
Note
Note
1:
2:
3:
4:
Limits are 100% production tested at T A = +25 N C. Limits over the operating temperature range are guaranteed by design.
0.1mA LED load current is not included.
Guaranteed by design. Not production tested.
LED current matching is defined as: (I MAX - I MAX )/25.6mA. Matching is for LEDs within the RGB group (RLED, GLED,
BLED) or the white LED group (WLED1–WLED8).
Note 5: Dropout voltage is defined as the LED_ to AGND voltage at which current into LED_ drops 10% from the value at V LED_ =
0.5V at 1x mode.
Note 6: V KEY = 0V when pulling low, leakage current from PV3. V KEY = 3.7V when pulling high, leakage current is to GND.
Typical Operating Characteristics
(V PV_ = V EN = 3.7V, circuit of Figure 1, T A = +25°C, unless otherwise noted.)
WLED EFFICIENCY vs. INPUT VOLTAGE,
6 MATCHED WLEDS
WLED EFFICIENCY vs. INPUT VOLTAGE,
6 MISMATCHED WLEDS
EFFICIENCY vs. Li+ BATTERY VOLTAGE
DRIVING 6 MATCHED LEDs
100
90
80
70
I LED_ = 1.6mA, 6.4mA, 16mA, 20.8mA
100
90
80
70
I LED_ = 1.6mA, 6.4mA, 16mA, 20.8mA
100
90
80
70
16mA/LED
20.8mA/LED
60
60
60
1.6mA/LED
6.4mA/LED
50
40
50
40
50
40
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
4.2 3.9
3.8
3.7
3.6
3.5 3.4 3.0
100
INPUT VOLTAGE (V)
EFFICIENCY vs. Li+ BATTERY VOLTAGE
DRIVING 6 MISMATCHED LEDs
0.0265
INPUT VOLTAGE (V)
WLED CURRENT MATCHING
vs. INPUT VOLTAGE
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
WLED—CHARGE PUMP INACTIVE
MAX8930 toc06
90
80
6.4mA/LED
1.6mA/LED
0.0264
0.0263
0.0262
0.0261
I LED_ = 25.6mA
V C1P
V C1N
V PV_ = 3.8V, ILED_ = 25.6mA
0V
0V
70
0.0260
0.0259
60
50
20.8mA/LED
16mA/LED
0.0258
0.0257
0.0256
0.0255
V C2P
V C2N
V NEG
0V
0V
0V
40
0.0254
4.2 3.9
3.8
3.7
3.6
3.5 3.4 3.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
100ns/div
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
Maxim Integrated
INPUT VOLTAGE (V)
9
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