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Design Alternatives To The TC682 For Performing Inverting Voltage Doubler Functions

From Microchip Technology, Inc.
 

 
Creating a negative DC bias voltage from a positive DC supply often is required in battery-powered, portable, hand-held instruments that use a Liquid Crystal Display (LCD). Many LCDs require a relatively large negative bias (on the order of -10V). Since many portable systems (such as cellular subscriber units) often have a regulated +5V DC bias available, the critical design task involves converting this supply voltage to a negative DC bias for the LCD. This application note discusses the advantages and disadvantages of several alternatives for implementing the -10V bias required by the LCD. Assuming that a single-cell Li-Ion battery (with a nominal terminal voltage of 3.6V) is powering the system, a regulating DC/DC boost converter is needed to generate the +5V regulated input supply to the TC682.
Product Announcements
Automationdirect.com - DC to DC Converters
There are four models for DC input voltage in the PSP series of DIN-rail DC-to-DC converters. All models come with a 3 year warranty.Wide input ranges of 9.5 to 18VDC and 18 to 75VDC allow these... (read more)
UltraVolt, Inc. - "XS" Series Xtra-Small Microsize HV Power Supplies
The "XS" Series extra-small high-voltage power supplies at only 0.08in3 [1.3cc] is the smallest regulated DC-DC high-voltage power supply for bias supplies, APDs and MPPCs that need a bias voltage... (read more)
OceanServer Technology, Inc. - BB-04SR IBPS Base Battery Management Module
Make any device battery powered! First drop in OEM battery system for adding multiple Li-Ion battery packs. BB-04SR IBPS (Intelligent Battery and Power System) unit manages and performs all critical... (read more)
Vitrek Corporation - Manual/Programmable Bench/System DC Power Supplies
Short Description: The GW Instek family of DC Power Supplies consists of manual/programmable constant voltage/constant current units with deliverable power from <100 VA to >1000VA. Models... (read more)
UltraVolt, Inc. - High Power "C" Series High Voltage Power Supply
Fast Rise/Low Overshoot Capacitor Charging & DC Bias Power 0 to 8kV through 0 to 15kV @ 0 to 60 watts & 125 watts... (read more)
Acopian Power Supplies - Mini Encapsulated AC-DC, DC-DC - 3 Day Shipping
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OceanServer Technology, Inc. - Lithium Ion Power Boxes
The Power Boxes are portable rechargeable power system in a weatherproof rugged box. The flexible design allows for a full range of output voltages (ie..POE, 12V,19V, 24V, 28V, 48V) to meet virtually... (read more)
 
Topics of Interest
The AAT3110 and AAT3111 switched capacitor voltage converters are designed to deliver a regulated 3.3V, 3.6V, or 5V output from an input supply ranging from 1.8V to 5V (respective to AAT3110/AAT3111... (Read More)
A conventional Schottky diode detector such as the Avago Technologies HSMS-8101 requires no bias for high level input power - above one milliwatt. However, at low levels, a small amount of dc bias is... (Read More)
Typical CCD camera sensors require a positive and negative bias voltage of +15V and -8V, respectively, at load currents up to 10mA. This application requires good output regulation for these bias... (Read More)
Isolated DC-DC voltage converters can provide positive or negative voltages from a single device. Most isolated converters have "floating" outputs that can withstand over 500V between the case, the... (Read More)
Operational amplifiers can be used as comparators to compare the amplitude of two voltages.  A comparator determines whether an input voltage is greater than a fixed reference voltage.  In... (Read More)