LCSC Electronics logoLCSC Electronics svg logo
Sign In
USD
Cart
MAXIM MAX749CSA+T product image
  • MAX749CSA+T thumbnail 1
  • MAX749CSA+T thumbnail 2
  • MAX749CSA+T thumbnail 3
  • Pinout
  • Footprint
Images for reference only

MAXIM MAX749CSA+TRoHS

Manufacturer
MAXIM
MPN
MAX749CSA+T
LCSC Part #
C2155989
Packaging
SOIC-8
Customer #
Key Attributes
Digitally Adjustable LCD Bias Supply
Datasheetpdf iconMAXIM MAX749CSA+T
In-Stock: 74
74 In stock, ships now
Add to BOM List
QtyUnit PriceTotal Amount
1+$ 3.8732$ 3.87
10+$ 3.3318$ 33.32
30+$ 3.0098$ 90.29
100+$ 2.6846$ 268.46
500+$ 2.535$ 1267.50
1,000+$ 2.4667$ 2466.70
Standard Packaging2500/Full Reel
Better price for more quantity?
$

Products Specifications

Show similar products (0) >
TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/Power Management - Specialized
ManufacturerMAXIM
PackagingSOIC-8
Pd - Power Dissipation-
Operating Temperature0℃~+70℃
Interface-
Frequency-
FeaturesIntegrated boost circuit
Voltage - Supply2V~6V
Supply Current-
Quiescent Supply Current60uA
Report an ErrorShow similar products (0) >

Additional Information

TypeDetails
Minimum1
Multiple1
Standard Packaging2500
Sales UnitPiece

Introduction

AI Translation

The MAX749 is a negative-output inverting power controller that can drive an external PNP transistor or Pchannel MOSFET. An external resistor and an internal DAC control the output voltage. The MAX749 is designed to operate from 2V to 6V inputs, ideal for operation from low-voltage batteries. In systems with higher-voltage batteries, such as notebook computers, the MAX749 may also be operated from the regulated +5V supply. A high-efficiency +5V regulator, such as the MAX782, is an ideal source for the MAX749. The MAX749 and the external components shown in the Typical Operating Circuit form a flyback converter. Feedback control adjusts the external transistor’s timing to provide a regulated negative output voltage. The MAX749’s unique control scheme combines the ultra-low supply current of pulse-skipping, pulse-frequency modulation (PFM) converters with the high fullload efficiency characteristic of pulse-width modulation (PWM) converters. This control scheme allows the device to achieve high efficiency over a wide range of loads. The current-sense function and high operating frequency allow the use of tiny external components.

Features

AI Translation
  • The MAX749 generates negative LCD-bias contrast voltages from 2V to 6V inputs.
  • Full-scale output voltage can be scaled to -100V or greater, and is digitally adjustable in 64 equal steps by an internal digital-toanalog converter (DAC).
  • Only seven small surfacemount components are required to build a complete supply.
  • The output voltage can also be adjusted using a PWM signal or a potentiometer.
  • A unique current-limited control scheme reduces supply current and maximizes efficiency, while a high switching frequency (up to 500kHz) minimizes the size of external components.
  • Quiescent current is only 60μA max and is reduced to under 15μA in shutdown mode.
  • While shut down, the MAX749 retains the voltage set point, simplifying software control.
  • The MAX749 drives either an external P-channel MOSFET or a PNP transistor.
  • +2.0V to +6.0V Input Voltage Range
  • Flexible Control of Output Voltage: Digital Control, Potentiometer Adjustment, PWM Control
  • Output Voltage Range Set by One Resistor
  • Low, 60μA Max Quiescent Current
  • 15μA Max Shutdown Mode
  • Small Size – 8-Pin SO and Plastic DIP Packages

Applications

AI Translation
  • Notebook Computers
  • Laptop Computers
  • Palmtop Computers
  • Personal Digital Assistants
  • Communicating Computers
  • Portable Data-Collection Terminals