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MAX1574

Features: Up to 180mA (60mA/LED) Drive Capability83% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge0.5% (typ) LED Current MatchingAdaptive 1x/2x Mode SwitchoverLow Input Ripple and EMI5% to 100% Dimming Through Single-Wire Serial Pulse InterfaceLow 0.1µA Shutdown Current2.7V to...

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SeekIC No. : 004409051 Detail

MAX1574: Features: Up to 180mA (60mA/LED) Drive Capability83% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge0.5% (typ) LED Current MatchingAdaptive 1x/2x Mode SwitchoverLow Input Ripple and EMI...

MAX1574 Data Sheet

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Part Number:
MAX1574
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:

Up to 180mA (60mA/LED) Drive Capability
83% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
0.5% (typ) LED Current Matching
Adaptive 1x/2x Mode Switchover
Low Input Ripple and EMI
5% to 100% Dimming Through Single-Wire Serial Pulse Interface
Low 0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Output Overvoltage Protection
Thermal-Shutdown Protection
10-Pin 3mm x 3mm TDFN Package


Application

LCD Backlighting
Camera Strobes/Flashes and Movie Lights
Cell Phones/Smart Phones
PDAs, Digital Cameras, and Camcorders


Pinout

Connection Diagram


Specifications

IN, OUT, EN to GND...........................................-0.3V to +6.0V
SET, LED1, LED2, LED3, CN to GND .........-0.3V to (VIN + 0.3V)
CP to GND  ..................................................................-0.3V to
                                  the greater of (VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND .......................................Continuous
Continuous Power Dissipation (TA = +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


Description

The MAX1574 charge pump drives up to three white LEDs with regulated constant current for uniform intensity. By utilizing adaptive 1x/2x charge-pump modes and very-low-dropout current regulators, it achieves 180mA output drive capability and high efficiency over the 1-cell lithium-battery input voltage range. Fixed-frequency (1MHz) switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.

The MAX1574 uses an external resistor to set the fullscale 100% LED current. An enable input (EN) is used for simple on/off control or can be pulsed repeatedly to set lower LED current in multiple steps down to 5%. Once the desired brightness is set, the MAX1574 maintains constant LED current as long as EN is kept high. If EN is kept low for more than 2ms, the MAX1574 enters shutdown.

The MAX1574 is available in a 10-pin 3mm x 3mm TDFN package (0.8mm max height).




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