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 (V
IN
+ 0.3V)
CP to GND ......................................................................-0.3V to
the greater of (V
OUT
+ 1V) or (V
IN
+ 1V)
OUT Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (T
A
= +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 2ms
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
= 4.12kΩ 52 60 mA
LED_ Dropout Voltage R
SET
= 4.12kΩ (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
915
Ω
Switching Frequency 1 MHz
OUT Pulldown Resistance in Shutdown EN = GND 5 kΩ
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
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