MAX1575(2003) 查看數據表（PDF） - Maxim Integrated
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MAX1575 Datasheet PDF : 9 Pages
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White LED 1x/1.5x Charge Pump
for Main and Sub-Displays
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3.6V, VGND = 0V, ENM = ENS = IN, RSET = 6.81kΩ, CIN = C1 = C2 = COUT = 1µF, TA = -40°C to +85°C, unless otherwise
noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
tLO (ENM, ENS) (Figure 1)
tHI (ENM, ENS) (Figure 1)
Initial tHI (ENM, ENS) (Figure 1)
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
CONDITIONS
Only required for first EN_ pulse
MIN TYP MAX UNITS
0.5
500
µs
0.5
µs
50
µs
+160
°C
20
°C
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
Note 2: LED current matching is defined as: (ILED - IAVG) / IAVG
Note 3: Dropout voltage is defined as the LED_-to-GND voltage at which current into the LED drops 10% from the LED current at
VLED_ = 0.2V.
Typical Operating Characteristics
(VIN = 3.6V, ENM = ENS = IN, circuit of Figure 2, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. SUPPLY VOLTAGE
DRIVING SIX WHITE LEDs
100
90
80
70
60
20mA/LED
50 2mA/LED 8mA/LED
40
30
20
2.7
SUPPLY VOLTAGE FALLING
3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
INPUT CURRENT vs. SUPPLY VOLTAGE
DRIVING TWO WHITE LEDs
200
180
SUPPLY VOLTAGE FALLING
160
140
20mA/LED
120
100
8mA/LED
80
2mA/LED
60
40
20
0
2.7 3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
INPUT CURRENT vs. SUPPLY VOLTAGE
DRIVING SIX WHITE LEDs
200
180
20mA/LED
160
140
120
SUPPLY VOLTAGE FALLING
100
80
8mA/LED
60
40
2mA/LED
20
0
2.7 3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
INPUT RIPPLE vs. SUPPLY VOLTAGE
DRIVING SIX WHITE LEDs
70
60
50
40
20mA/LED
30
8mA/LED
20
2mA/LED
10
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
INPUT CURRENT vs. SUPPLY VOLTAGE
DRIVING FOUR WHITE LEDs
200
180
SUPPLY VOLTAGE FALLING
160
140 20mA/LED
120
100
80
60 8mA/LED
40
20
2mA/LED
0
2.7 3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
LED CURRENT MATCHING
vs. SUPPLY VOLTAGE
22
21
20
19
18
17
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
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