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MAX1574 View Datasheet(PDF) - Maxim Integrated

Part Name
Description
View to exact match
MAX1574 Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3.6V, VGND = 0V, EN = IN, RSET = 13.7k, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
(Note 1)
PARAMETER
EN Input Current
EN Low Shutdown Delay
EN tLO (Figure 1)
EN tHI (Figure 1)
Initial EN tHI (Figure 1)
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
CONDITIONS
EN = GND or 5.5V, TA = +25°C
EN = GND or 5.5V, TA = +85°C
Only required for first EN_ pulse
MIN TYP MAX UNITS
0.01
1
µA
0.1
1.0
2
3.3
ms
0.5
500
µs
0.5
µs
50
µs
+160
°C
20
°C
Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
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 LED_ drops 10% from the value at VLED_ = 0.2V.
Typical Operating Characteristics
(Circuit of Figure 2, VIN = 3.6V, EN = IN, driving three white LEDs, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
100
90
80
70
60
50
40
30
ILED = 8mA ILED = 40mA
ILED = 2mA ILED = 20mA
20
10
0
2.7
VIN FALLING
3.0 3.3 3.6 3.9 4.2
INPUT VOLTAGE (V)
INPUT CURRENT vs. INPUT VOLTAGE
300
ILED = 40mA
250
VIN FALLING
200
150 ILED = 20mA
100
ILED = 8mA
50
ILED = 2mA
0
2.7 3.0 3.3 3.6 3.9 4.2
INPUT VOLTAGE (V)
INPUT RIPPLE vs. SUPPLY VOLTAGE
25
20
15
10
20mA/LED
60mA/LED
2mA/LED
8mA/LED
5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
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