ENGLISH 简体中文 日本語 한국어  

    Login | Register 


   
 
Enter keywords or part number    



MAX8645X, MAX8645Y
1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Description
FULL DATA SHEET (PDF, 252kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail
The MAX8645X/MAX8645Y charge pumps drive up to eight white LEDs with regulated constant current for uniform intensity. The main group of LEDs (M1–M6) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (F1 and F2) is independently controlled and can be driven up to 200mA per LED (or 400mA total). Two 200mA LDOs are on-board to provide power for camera functions. The LDOs' output voltages are pin programmable to meet different camera-module requirements. The MAX8645X and MAX8645Y differ only in LDO output voltages. By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, the MAX8645X/MAX8645Y achieve high efficiency over the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.

The MAX8645X/MAX8645Y are available in a 28-pin TQFN, 4mm x 4mm (0.8mm max height) lead-free package.

Key Features
  • Power Up to Eight LEDs
    • Up to 30mA/LED Drive for Backlight
    • Up to 400mA Total Drive for Flash
  • Two Internal Low-Noise 200mA LDOs
  • 94% Max/85% Avg Efficiency (PLED/PBATT) over Li+ Battery Discharge
  • 0.2% Typical LED Current Matching
  • Adaptive 1x/1.5x/2x Mode Switchover
    • Single-Wire, Serial-Pulse Interface for Brightness Control (32 Steps)
    • 2-Bit Logic (Three Levels)
  • Thermal TA Derating Function
  • Low Input Ripple and EMI
  • 2.7V to 5.5V Supply Voltage Range
  • Soft-Start, Overvoltage, and Thermal-Shutdown Protection
  • 28-Pin TQFN, 4mm x 4mm Package

Key Specifications:   White LED Drivers
Part Number Topology Max. No. of LEDs Configuration Dimming Control VDROPOUT (typ) (mV) POUT (W) IMAX per LED (mA) Min. VIN (V) Max. VIN (V) ICC (max) (mA) Max. VOUT (V) Operating Freq. (kHz) Package Smallest Available Package (max w/pins) (mm2) Price**
MAX8645  Charge Pump 8 Parallel Analog
Digital
PWM
Serial Pulse
40 2.8 200 2.7 5.5 5.5 5.5 1000 TQFN/28 17 $2.74 @ 1k
See All White LED Drivers (46)
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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Didn't Find What You Need?
  • Next Day Product Selection Assistance from Applications Engineers
  • Parametric Search
  • Applications Help
  •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

     Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

     Price and Availability 
     Samples 
     Buy Online 
     Package Information 
     Lead-Free Information 

     Related Products 
     Notes and Comments 
     Evaluation Kits 

    Document Ref.: 19-3978; Rev 4; 2008-07-01
    This page last modified: 2008-12-11


            •         •         •     Privacy Policy     •     Legal Notices

        Copyright © 2009 by Maxim Integrated Products