MAX8847Z Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8847Z
Maxim Integrated
MAX8847Z Datasheet PDF : 13 Pages
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MAX8847Y/MAX8847Z
High-Performance Negative Charge Pump
for 6 White LEDs in 3mm x 3mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3.6V, VGND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
EN_ Low Shutdown Delay
tSHDN
EN_ tLO
EN_ tHI
Initial EN_ tINIT
CHARGE PUMP
Switching Frequency
Soft-Start Time
Output Regulation Voltage
Open-Loop NEG Output
Resistance
CONDITIONS
See Figure 2
See Figure 2
See Figure 2, first EN_ high pulse
VIN - VNEG
(VNEG - 0.5 x VIN)/INEG
MIN TYP MAX UNITS
5
8
ms
1
500
Fs
1
Fs
120
Fs
1
0.5
4.3
5
MHz
ms
V
2
4
I
NEG Shutdown Discharge
Resistance
VEN_ = 0V, all outputs off
10
kI
LED1–LED6 CURRENT REGULATOR
Current Setting Range
Serial-pulse interface or PWM
0.1
24.0
mA
LED_ Current Accuracy
24mA setting, TA = +25NC
-2
Q1
+2
VLED_= 0.5V for charge
pump inactive,
VLED_ = -0.9V,
VNEG_= -1.4V
24mA setting, TA = -40NC
to derating function start
temperature (Note 3)
-5
+5
%
1.6mA setting, TA = +25NC
Q5
Derating Function Start
Temperature
+60
NC
Derating Function Slope
From derating function start temperature
-2.5
%/NC
LED_ Dropout Voltage
(Note 4)
Charge pump inactive,
24mA setting
Charge pump active,
24mA setting
TA = +25NC
TA = +85NC
TA = +25NC
TA = +85NC
85
125
95
mV
110
124
LED_ Current Regulator
Switchover Threshold
(Inactive to Active)
VLED_ falling
135
150
165
mV
LED_ Current Regulator
Switchover Hysteresis
100
mV
LED_ Leakage in Shutdown All LEDs off
TA = +25NC
TA = +85NC
0.01
5
FA
0.1
Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 3: Guaranteed by design. Not production tested.
Note 4: LED dropout voltage is defined as the LED_ to GND voltage at which current into LED_ drops 10% from the value at
VLED_ = 0.5V.
Maxim Integrated
3
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