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MAX1570

Features: Excellent 0.3% LED-to-LED Current Matching 30mA/LED Drive CapabilityProprietary 1x/1.5x Modes for Ultra-High EfficiencyLow Input Ripple and EMIEliminates Ballast ResistorsDigital or PWM LED Dimming Control0.1µA Shutdown Current2.7V to 5.5V Supply Voltage RangeSoft-Start Limits Inru...

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SeekIC No. : 004409047 Detail

MAX1570: Features: Excellent 0.3% LED-to-LED Current Matching 30mA/LED Drive CapabilityProprietary 1x/1.5x Modes for Ultra-High EfficiencyLow Input Ripple and EMIEliminates Ballast ResistorsDigital or PWM LE...

MAX1570 Data Sheet

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Part Number:
MAX1570
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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 ✕ 4mm Thin QFN Package


Application

White LED Backlighting
Cell Phones and Smart Phones
PDA and Palmtop Computers
Portable MP3 Players
Digital Cameras and Camcorders


Pinout

Connection Diagram


Specifications

IN, OUT, EN1, EN2 to GND.....................................-0.3V to +6V
SET, LED1, LED2, LED3, LED4,
  LED5 to GND............................................-0.3V to (VIN + 0.3V)
PGND to GND.........................................................-0.3 to +0.3V
C1N, C2N to GND .........................................-0.3V to (VIN + 1V)
C1P, C2P to GND.........................................-0.3V to the greater
(VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND.............................................Indefinite
Continuous Power Dissipation (TA = +70°C)
  16-Pin Thin QFN (derate 16.9 mW/°C) .......................1349mW
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


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 ✕ 4mm Thin QFN packaging (0.8mm max height).




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