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180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.6V, V GND = 0V, EN = IN, R SET = 13.7k ? , T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)
(Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
EN Input Current
EN Low Shutdown Delay
EN t LO (Figure 1)
EN t HI (Figure 1)
Initial EN t HI (Figure 1)
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
EN = GND or 5.5V, T A = +25°C
EN = GND or 5.5V, T A = +85°C
Only required for first EN_ pulse
1.0
0.5
0.5
50
0.01
0.1
2
+160
20
1
3.3
500
μA
ms
μs
μs
μs
°C
°C
Note 1: Limits are 100% production tested at T A = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2: LED current matching is defined as: (I LED - I AVG ) / I AVG
Note 3: Dropout voltage is defined as the LED_-to-GND voltage at which current into LED_ drops 10% from the value at V LED_ = 0.2V.
Typical Operating Characteristics
(Circuit of Figure 2, V IN = 3.6V, EN = IN, driving three white LEDs, T A = +25°C, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
INPUT CURRENT vs. INPUT VOLTAGE
INPUT RIPPLE vs. SUPPLY VOLTAGE
100
90
80
300
250
I LED = 40mA
V IN FALLING
25
20
60mA/LED
70
60
200
15
50
40
30
20
10
0
I LED = 8mA I LED = 40mA
I LED = 2mA I LED = 20mA
V IN FALLING
150
100
50
0
I LED = 20mA
I LED = 8mA
I LED = 2mA
10
5
0
20mA/LED
2mA/LED
8mA/LED
2.7
3.0
3.3
3.6
3.9
4.2
2.7
3.0
3.3
3.6
3.9
4.2
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
3
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