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1x/1.5x/2x White LED Charge Pump with
Two LDOs in 4mm x 4mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.6V, V GND = V PGND = 0V, ENM1 = ENM2 = ENF = IN, R SETM = R SETF = 6.8k Ω , P1 = P2 = unconnected, C REF = 0.01μF,
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
Soft-Start Done Time
100
μs
Dropout Voltage
I LDO_ = 200mA (Note 4)
120
320
mV
Load Regulation
Power-Supply Rejection
Δ V OUT / Δ V IN
Output Noise Voltage (RMS)
V IN = 3.7V, 100μA < I LDO_ < 200mA
10Hz to 10kHz, C LDO_ = 1μF, I LDO_ = 10μA
10Hz to 100kHz, C LDO_ = 1μF, I LDO_ = 10mA
-60
40
1.3
%
dB
μV RMS
Note 1: All devices are 100% production tested at T A = +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 2: LED dropout voltage is defined as the M_ or F_ to GND voltage at which current into M_ or F_ drops 10% from the value at
M_ or F_ = 0.2V.
Note 3: (Greater of 2.7V or (V LDO_ + 0.5V)) ≤ V IN ≤ 5.5V.
Note 4: LDO dropout voltage is defined as V IN - V OUT when V OUT is 100mV below the value of V OUT measured when V IN =
V OUT(NOM) + 1V. Since the minimum input voltage is 2.7V, this specification is only meaningful when V OUT(NOM) > 2.5V.
Typical Operating Characteristics
(V IN = V EN_ = 3.6V, circuit of Figure 1, T A = +25°C, unless otherwise noted.)
EFFICIENCY vs. Li+ BATTERY
VOLTAGE DRIVING FOUR MAIN LEDs
EFFICIENCY vs. Li+ BATTERY
VOLTAGE DRIVING FLASH LED MODULE
BATTERY CURRENT vs. SUPPLY VOLTAGE
DRIVING FOUR MAIN LEDs
100
90
100
90
80mA TOTAL
160mA TOTAL
120
100
I LED = 15mA
V IN FALLING
V IN RISING
80
70
15mA/LED
80
70
80
60
I LED = 4.5mA
60
4.5mA/LED
60
40
I LED = 1.5mA
50
40
1.5mA/LED
50
40
400mA TOTA L
20
0
2.7
3.0
3.3
3.6
3.9
4.2
2.7
3.0
3.3
3.6
3.9
4.2
2.7
3.0
3.3
3.6
3.9
4.2
Li+ BATTERY VOLTAGE (V)
Li+ BATTERY VOLTAGE (V)
SUPPLY VOLTAGE (V)
4
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