Datasheet Linear Technology LTC1682IMS8-5#PBF

Manufacturer	Linear Technology
Series	LTC1682
Part Number	LTC1682IMS8-5#PBF

Doubler Charge Pumps with Low Noise Linear Regulator

Datasheets

PDF, 201 Kb, Revision: S, File uploaded: Sep 27, 2017

Extract from the document

Prices

Packaging

Package	MS-8
Package Code	MS8
Package Index	05-08-1660

Parametrics

Demo Boards	DC249A-A,DC249A-B,DC249A-C,DC332A
Design Tools	LTspice Model
Export Control	no
Frequency	550 kHz
Function	Regulated Step-Up Charge Pump
Ishutdown	1 µA
Isupply	0.15 mA
Number of Outputs	1
Operating Temperature Range	-40 to 85 °C
Output Current	0.05 A
Output Voltage	3.3V, 5V, Adj
Vin Max	4.4 V
Vin Min	1.8 V

Eco Plan

RoHS

Compliant

Design Notes

Download
Tiny Regulators Drive White LED Backlights &mdash DN231
PDF, 76 Kb, File published: May 1, 2001
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Tiny Regulators Drive White LED Backlights вЂ“ Design Note 231
Dave Kim
Introduction
The emergence of color LCD displays in handheld
information appliances has created the need for a
small, bright white backlight. Fortunately, the recent
commercialization of high intensity white LEDs provides
the perfect solution. These tiny LEDs are capable of
delivering ample white light without the fragility problems and costs associated with п¬‚uorescent backlights
commonly used in notebook computers. However, they
do pose a problemвЂ”the forward voltage of white LEDs
can be as high as 4V, precluding powering them directly
from a single lithium-ion cell.
This Design Note describes several different circuits that
may be used to boost and regulate the Li-Ion battery
voltage to power white LEDs. These circuits provide
sufп¬Ѓcient power to drive multiple white LEDs and are
small enough to easily п¬Ѓt within cellular telephones and
handheld computers. VIN
3V TO
4.2V LTC1754-5
C3
10ОјF …

Articles

Download
Low Noise Boost VCO Power Supply for Portable Applications &mdash LT Journal
PDF, 167 Kb, File published: Sep 1, 1999
Extract from the document
DESIGN IDEAS Low Noise Boost VCO Power Supply
for Portable Applications
by Ted Henderson
Introduction
Many portable RF products use voltage controlled oscillators (VCOs) to
generate the RF carrier frequency.
These applications often require low
noise VCO power supply voltages that
are greater than the primary battery
supply. A DC/DC converter powering
a low noise linear regulator is often
used. Unfortunately, there are several disadvantages to this solution.
The DC/DC converter tends to produce noise that may not be rejected
by the regulator, resulting in regulator output noise far greater than the
thermal noise levels. The linear regulator may require a large output compensation capacitor with specific
ESR requirements. The board area
for both devices and support components can be large. The LTC1682
charge pump DC/DC voltage converter has been designed to minimize
these issues. The charge pump and
linear regulator have been mutually
optimized for minimum regulator output noise. The linear regulator was
designed to operate with several different types of output capacitors
including small, low value, low ESR …

Model Line

Series: LTC1682 (24)

LTC1682CMS8#PBF LTC1682CMS8#TRPBF LTC1682CMS8-3.3#PBF LTC1682CMS8-3.3#TRPBF LTC1682CMS8-5#PBF LTC1682CMS8-5#TRPBF LTC1682CS8#PBF LTC1682CS8#TRPBF LTC1682CS8-3.3#PBF LTC1682CS8-3.3#TRPBF LTC1682CS8-5#PBF LTC1682CS8-5#TRPBF LTC1682IMS8#PBF LTC1682IMS8#TRPBF LTC1682IMS8-3.3#PBF LTC1682IMS8-3.3#TRPBF LTC1682IMS8-5#PBF LTC1682IMS8-5#TRPBF LTC1682IS8#PBF LTC1682IS8#TRPBF LTC1682IS8-3.3#PBF LTC1682IS8-3.3#TRPBF LTC1682IS8-5#PBF LTC1682IS8-5#TRPBF

Manufacturer's Classification

Power Management > Inductorless (Charge Pump) DC/DC Converters > Regulated Step-Up Charge Pumps

Other Names:

LTC1682IMS8-5PBF, LTC1682IMS8-5 PBF, LTC1682IMS85#PBF, LTC1682IMS8 5#PBF

EMS supplier

Slices

Microcontrollers