1.5x/2x High-Efficiency White LED
Charge Pumps
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.6V, GND = 0, SHDN = SET = IN, C IN = 2.2μF, C1 = C2 = 0.47μF, C OUT = 2.2μF, T A = -40°C to +85°C , unless otherwise
noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
MAX
UNITS
Output Leakage Current in Shutdown
SET Regulation Point
SET Input Current
V IN = 3.6V, SHDN = 0
0.19
10
0.21
100
μA
V
nA
SHDN Input Current
SHDN Input Voltage Low
SHDN Input Voltage High
SHDN = 0 or 5.5V
2.7V < V IN < 5.3V
2.7V < V IN < 5.3V
1.6
1
0.4
μA
V
V
Note 1: Limits to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 2, V IN = 3.3V, T A = +25°C, unless otherwise noted.)
START-UP INPUT CURRENT AND
INPUT AND OUTPUT VOLTAGE RIPPLE
V IN
INPUT AND OUTPUT VOLTAGE RIPPLE
V SHDN
OUTPUT VOLTAGE
MAX1910/12 toc03
5V/div
V IN
V OUT
20mV/div
V OUT
CIRCUIT OF FIGURE 7
DRIVING 4 LEDS (60mA)
20mV/div
V OUT
2V/div
50mA/div
I IN
I OUT = 60mA
4.0
1 μ s/div
QUIESCENT CURRENT vs. INPUT VOLTAGE
140
1 μ s/div
LED CURRENT vs. INPUT VOLTAGE
1ms/div
INTENSITY CHANGE STEP RESPONSE
MAX1910/12 toc06
3.5
3.0
2.5
2.0
120
100
80
V LOGIC
V SET
2V/div
100mV/div
60
1.5
1.0
0.5
0
40
20
0
I OUT
CIRCUIT OF FIGURE 9
60mA
20mA
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
2.7
3.0
3.3
3.6
3.9
4.2
4.5
40 μ s/div
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
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