Features: High-Efficiency 1.5x Charge Pumps
Low Input Ripple with 750kHz Operation
200mV Current-Sense Threshold Reduces Power Loss
Current- or Voltage-Regulated Charge Pump
60mA Output Current
No Inductors Required
Small Ceramic Capacitors
Regulated ±3% Output Voltage
Load Disconnected in Shutdown
1A Shutdown Current
Small 10-Pin MAX PackageApplicationBacklight White LED Biasing
Cellular Phones
PDAs
Digital Still Cameras
MP3 Players
Backup-Battery Boost ConvertersPinout
SpecificationsIN1, IN2, OUT, SHDN , SET to GND ......................................-0.3V, +6V
C1-, C2-, to GND...........................................................-0.3V, VIN + 1V
C1+, C2+ to GND...................-0.3V, greater of VOUT + 1V or VIN + 1V
OUT Short-Circuit to GND ...................................................Continuous
Continuous Power Dissipation
10-Pin MAX (derate 5.6 mW/°C above +70°C) ...................444mW
Operating Temperature Range ................................-40°C to +85°C
Storage Temperature Range .................................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ ......+300°C
DescriptionThe MAX1912/MAX1913* power LEDs with a regulated output voltage or current (up to 60mA) from an unregulated input supply (2.7V to 5.3V). These are complete DC-DC converters requiring only four small ceramic capacitors and no inductors. Input ripple is minimized by a unique regulation scheme that maintains a fixed 750kHz switching frequency over a wide load range. Also included are logic-level shutdown and soft-start to reduce input current surges at startup.
The MAX1912 has a reduced feedback (SET) threshold of 200mV for minimum loss when operating as a current source. The MAX1913 has a 1.25V SET threshold for best accuracy in voltage-feedback applications. Connecting SET to IN on the MAX1913 selects a preset 5.0V output voltage. Contact factory for current-sense thresholds other than 200mV or preset output voltages
other than 5.0V
MAX1912 Data Sheet
