MAX1570

White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump


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Description

The MAX1570 fractional charge pump drives up to five white LEDs with regulated constant current for uniform intensity. The MAX1570 maintains the highest possible efficiency over the full 1-cell lithium-ion (Li+) battery input voltage range by utilizing a 1x/1.5x fractional charge pump and very-low-dropout current regulators. The MAX1570 operates with 1MHz fixed-frequency switching, allowing for tiny external components. The regulation scheme is optimized to ensure low EMI and low input ripple.

An external resistor sets the full-scale LED current, while two digital inputs control on/off and select between three levels of brightness. A pulse-width modulation (PWM) signal can also be used to modulate LED brightness.

The MAX1570 is available in 16-pin 4mm x 4mm Thin QFN packaging (0.8mm max height).
MAX1570: Typical Operating Circuit MAX1570: Typical Operating Circuit Enlarge+

Key Features

  • Excellent 0.3% LED-to-LED Current Matching
  • 30mA/LED Drive Capability
  • Proprietary 1x/1.5x Modes for Ultra-High Efficiency
  • Low Input Ripple and EMI
  • Eliminates Ballast Resistors
  • Digital or PWM LED Dimming Control
  • 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Soft-Start Limits Inrush Current
  • Thermal-Shutdown Protection
  • No External Inductor, Schottky, or Zener Diode Required
  • Tiny 16-Pin 4mm x 4mm Thin QFN Package

Applications/Uses

  • Cell Phones/Smartphones
  • Digital Cameras and Camcorders
  • PDAs and Palmtop Computers
  • Portable MP3 Players
  • White LED Backlighting
Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
PWM Dimming Freq.
(kHz)
Dimming ControlPOUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
maxmaxminmaxmaxmaxSee Notes
MAX1570 1-Cell Li+Charge Pump55Parallel0.035
Digital
PWM
0.72.75.53.551000
TQFN/16
$2.17 @1k
See All LED Drivers (80)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1570EVKIT: Evaluation Kit for the MAX1570
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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