Rainbow Electronics MAX1574 User Manual
Page 2
MAX1574
180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.6V, V
GND
= 0V, EN = IN, R
SET
= 13.7kΩ, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, OUT, EN to GND..............................................-0.3V to +6.0V
SET, LED1, LED2, LED3, CN to GND .........-0.3V to (VIN + 0.3V)
CP to GND ......................................................................-0.3V to
the greater of (VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (TA = +70°C)
10-Pin TDFN (derate 18.2mW/°C above +70°C) .......1454mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IN Operating Voltage
2.7
5.5
V
Undervoltage-Lockout Threshold
V
IN
falling
2.25
2.45
2.60
V
Undervoltage-Lockout Hysteresis
40
mV
Output Overvoltage-Protection Threshold
V
OUT
rising
5
V
2x mode
2
No-Load Supply Current
10% setting, 1x mode
0.35
mA
EN = GND, T
A
= +25°C
0.01
1
Shutdown Supply Current
EN = GND, T
A
= +85°C
0.1
µA
Soft-Start Time
2
ms
SET Bias Voltage
0.6
V
EN = GND, T
A
= +25°C
0.01
1
SET Leakage in Shutdown
EN = GND, T
A
= +85°C
0.1
µA
SET Current Range
4
153
µA
SET-to-LED_ Current Ratio (I
LED
/I
SET
)
100% setting
393
A/A
LED Current Accuracy
T
A
= +25°C
±0.7
%
LED-to-LED Current Matching
(Note 2)
-4
±0.5
+4
%
Maximum LED_ Sink Current
R
SET
= 4.12k
Ω
52
60
mA
LED_ Dropout Voltage
R
SET
= 4.12k
Ω
(Note 3)
80
120
mV
1x to 2x Mode Transition Threshold
V
LED_
falling
120
130
140
mV
Input-Voltage-Mode Transition Hysteresis
150
mV
EN = GND, T
A
= +25°C
0.01
2
LED Leakage in Shutdown
EN = GND, T
A
= +85°C
0.1
µA
Maximum OUT Current
V
IN
≥
3.12V, V
OUT
= 3.9V
180
mA
1x mode, (V
IN
- V
OUT
) / I
OUT
1.5
2.5
Open-Loop OUT Resistance
2x mode, (2 x V
IN
- V
OUT
) / I
OUT
9
15
Ω
Switching Frequency
1
MHz
OUT Pulldown Resistance in Shutdown
EN = GND
5
k
Ω
EN High Voltage
V
IN
= 2.7V to 5.5V
1.6
V
EN Low Voltage
V
IN
= 2.7V to 5.5V
0.4
V