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480mA White LED 1x/1.5x/2x Charge Pump for
Backlighting and Camera Flash
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.6V, V GND1 = V GND2 = V PGND = 0V, ENM1 = ENM2 = ENF1 = ENF2 = IN, R SETM = R SETF = 6.8k Ω , T A = -40°C to +85°C,
unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER
LED_ Leakage in Shutdown
Charge-Pump Maximum OUT
Current
CONDITIONS
ENM1 = ENM2 = ENF1 = ENF2 = GND
V IN ≥ 3.15V, V OUT = 3.9V
MIN
480
TYP
0.1
MAX
2
UNITS
μA
mA
1x mode, (V IN - V OUT ) / I OUT
2.5
Open-Loop OUT Resistance
Switching Frequency
EN_ High Voltage
EN_ Low Voltage
1.5x mode, (1.5V IN - V OUT ) / I OUT
2x mode, (2V IN - V OUT ) / I OUT
V IN = 2.7V to 5.5V
V IN = 2.7V to 5.5V
1.6
1
5.0
5.0
0.4
Ω
MHz
V
V
EN_ Input Current
EN_ Low Shutdown Delay t SHDN
(See Figure 3)
EN_ t LO (See Figure 3)
EN_ t HI (See Figure 3)
V EN_ = 0V or 5.5V
225
0.5
0.5
0.01
470
1
800
250.0
μA
μs
μs
μs
Initial EN_ t HI (See Figure 3)
OUT Pulldown Resistance in
Shutdown
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Only required for first EN_ pulse
ENM1 = ENM2 = ENF1 = ENF2 = GND
50
5
+160
20
μs
k Ω
°C
°C
Note 1: Specifications to -40 ° C are guaranteed by design and not production tested.
Note 2: LED current matching is defined as: (I LED_ - I AVG ) / I AVG . Matching is for LEDs within the main group (LED1–LED4) or the
flash group (LED5–LED8).
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.
_______________________________________________________________________________________
3
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