Maxim > Products > Power and Battery Management > MAX8645X, MAX8645Y

MAX8645X, MAX8645Y

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

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Active: In Production.

Description

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.

Data Sheet

Download this datasheet in PDF formatDownload Rev 4 (PDF, 252kB)
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An evaluation board is available: MAX8645YEVKIT

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:

LED Drivers
Part Number Battery Input Regulation Topology Max. No. of LEDs LED Channels LED Configuration ILED per Channel
(A)
Dimming Ratio Dimming Control POUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Oper. Freq.
(kHz)
Budgetary
Price
max max min max max max See Notes
MAX8645  1-Cell Li+ Charge Pump 8 8 Parallel 0.2 32 Serial Pulse 2.8 2.7 5.5 5.5 5.5 1000 $2.95 @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.



Diagram

MAX8645X, MAX8645Y: Typical Operating Circuit
Typical Operating Circuit

More Information

New Product Press Release   2007-04-09 ]

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Information Index

Document Ref.: 19-3978 Rev 4; 2008-07-01
This page last modified: 2009-09-04