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Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.6V, V GND = 0V, 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
CURRENT REGULATOR (LED1–LED4)
Programmable Current Range
0.1
24.0
mA
I LED _ = 24mA, T A = +25°C
-2
±1
+2
Current Accuracy
I LED _ = 24mA, T A = -40°C to +85°C
-3
+3
%
I LED _ = 0.1mA, T A = +25°C
±5
LED_ Dropout Voltage
I LED _ = 24mA (Note 4)
Charge pump inactive
Charge pump active
60
80
120
250
mV
LED_ Current Regulator
Switchover Threshold (Inactive to
V LED_ falling
125
150
175
mV
Active)
LED_ Current Regulator
Switchover Hysteresis
100
mV
LED_ Shutdown Leakage Current
All LEDs off,
ENLED = GND
T A = +25°C
T A = +85°C
0.01
0.1
5
μA
LDO_
Output Current
(Note 5)
200
mA
Current Limit
LDO1 Dropout Voltage
LDO2 Dropout Voltage
Line Regulation
Load Regulation
Power-Supply Rejection
Δ V OUT / Δ V IN
Output Noise Voltage (RMS)
V LDO = 0V
I LDO1 = 200mA, V LDO1 = 2.8V (Notes 5 and 6)
I LDO2 = 200mA, V LDO2 = 2.8V (Notes 5 and 6)
3.4V ≤ V IN < 5.5V, I LDO = 100mA
50μA < I LDO < 200mA
10Hz to 10kHz, C LDO = 1μF, I LDO = 30mA
100Hz to 100kHz, C LDO = 1μF, I LDO = 30mA
220
150
300
1
0.1
60
45
750
250
550
mA
mV
mV
mV/V
mV/mA
dB
μV RMS
ENLDO count = 5
1.2
LDO1 Output Voltage
I LDO1 = 100mA (Note 7)
ENLDO count = 6, 13
ENLDO count = 1, 3, 7, 9, 14
2.716
1.8
2.800
2.884
V
ENLDO count = 2, 4, 8, 15
ENLDO count = 1, 2
3.3
1.2
LDO2 Output Voltage
I LDO2 = 100mA (Note 7)
ENLDO count = 3, 4, 10
ENLDO count = 5, 6, 7, 8, 11
1.746
1.5
1.800
1.854
V
ENLDO count = 9, 12
2.8
Ground Current
Shutdown Output Impedance
I LDO = 500μA
ENLDO = GND
50
1
μA
k Ω
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Limits are 100% production tested at T A = +25°C. Specifications over the operating temperature range are guaranteed by design.
Hold EN_ low for at least 2.5ms to guarantee shutdown.
Hold EN_ high for at least 2.5ms to latch EN count.
LED dropout voltage is defined as the LED_ to GND voltage when current into LED_ drops 10% from the value at V LED = 0.5V.
Guaranteed by design, not production tested.
LDO dropout voltage is defined as V IN - V OUT when V OUT has dropped 100mV below the initial value of V OUT when
V IN = V OUT + 0.8V.
Note 7: LDO output voltage corresponds to the LDO output voltage programmed by pulsing ENLDO low by the given count and
then holding ENLDO high for greater than t HOLD to set the voltage value. See Figure 2.
_______________________________________________________________________________________
3
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相关代理商/技术参数
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