MAX1912:1.5x/2x High-Efficiency White LED Charge Pumps

The MAX1910/MAX1912 power LEDs with a regulated output voltage or current (up to 120mA) 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 MAX1910 has two automatically selected operating modes: 1.5x and 2x. 1.5x mode improves efficiency at higher input voltages, while 2x mode maintains regulation at lower input voltages. The MAX1912 operates only in 1.5x mode. The MAX1910 and the MAX1912 are available in a space-saving 10-pin µMAX package.

Key Features
  • High-Efficiency 1.5x/2x Charge Pumps
  • Low Input Ripple with 750kHz Operation
  • 200mV Current-Sense Threshold Reduces Power Loss
  • Current- or Voltage-Regulated Charge Pump
  • Up to 120mA Output Current
  • No Inductors Required
  • Small Ceramic Capacitors
  • Regulated ±5% LED Current
  • Load Disconnected in Shutdown
  • 1µA Shutdown Current
  • Small 10-Pin µMAX Package
MAX1910, MAX1912: Typical Operating Circuit
MAX1910, MAX1912: Typical Operating Circuit
Applications/Uses
  • Backup Battery Boost Converters
  • Cell Phones
  • Digital Still Cameras
  • MP3 Players
  • PDAs
  • White LED Backlighting
DataSheet
titleDownload file
MAX1910-MAX1912 Data SheetMAX1910-MAX1912.pdf
Parametrics
Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
Dimming ControlPOUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
maxminmaxmaxmaxSee Notes
MAX19101-Cell Li+Charge Pump51Parallel0.12Analog0.52.75.32.55750µMAX/10$1.10 @1k
MAX19124µMAX/10$1.23 @1k
Design kits & evaluation modules
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1912EUBNo Longer AvailableMAX1912EUB+µMAX,;10 pin;15.4 mm²-40°C to +85°CNo
MAX1912EUB+ActiveµMAX,;10 pin;15.4 mm²-40°C to +85°CLead Free
MAX1912EUB+TActiveµMAX,;10 pin;15.4 mm²-40°C to +85°CLead Free
MAX1912EUB-TNo Longer AvailableMAX1912EUB+TµMAX,;10 pin;15.4 mm²-40°C to +85°CNo
MAX1910-MAX1912.pdf MAX1912
Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently MAX8596
MAX1910-MAX1912.pdf MAX1912