MAX8647 查看數據表（PDF） - Maxim Integrated
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MAX8647 Datasheet PDF : 15 Pages
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Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(VVDD = VIN = 3.6V, VGND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Derating-Function Start Temperature
+60
°C
Derating-Function Slope
From derating-function start temperature
-2.5
%/°C
LED_ RDSON
Not utilizing the charge pump
Utilizing the charge pump
3
Ω
4
LED_ Dropout
24mA setting
(Note 3)
Not utilizing the charge pump
Utilizing the charge pump
60
120
mV
90
200
LED_ Current Regulator Switchover
Threshold (Inactive to Active)
VLED_ falling
125
150
175
mV
LED_ Current Regulator Switchover
Hysteresis
100
mV
LED_ Leakage in Shutdown
All LEDs off
TA = +25°C
TA = +85°C
0.01
5
µA
0.1
Note 1: Limits are 100% production tested at TA = +25°C. Specifications over the operating temperature range are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: 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.
Typical Operating Characteristics
(VIN = 3.6V, VEN_ = VIN, circuit of Figure 1, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. SUPPLY VOLTAGE
(DRIVING SIX MATCHED LEDs)
100
90
80
70
20.8mA/LED
60
50
16mA/LED
1.6mA/LED
40
6.4mA/LED
30
20
10
0
2.7 3.0 3.3 3.6 3.9 4.2
INPUT VOLTAGE (V)
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(DRIVING SIX MATCHED LEDs)
100
90
80
70
20.8mA/LED
1.6mA/LED
60
16mA/LED
6.4mA/LED
50
40
4.2 3.9 3.8 3.7 3.6 3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
EFFICIENCY vs. SUPPLY VOLTAGE
(DRIVING SIX LEDs)
100
90
80
70
60
50
1.6mA/LED
40
16mA/LED
30
20
10
LEDs HAVE MISMATCHED VF
0
2.7 3.0 3.3 3.6 3.9 4.2
INPUT VOLTAGE (V)
4 _______________________________________________________________________________________
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