Datasheet Linear Technology LTC1872

Manufacturer	Linear Technology
Series	LTC1872

Constant Frequency Current Mode Step-Up DC/DC Controller in SOT-23

Datasheets

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PDF, 266 Kb, Revision: A, File uploaded: Sep 20, 2017

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Prices

Packaging

	LTC1872ES6#PBF	LTC1872ES6#TRMPBF	LTC1872ES6#TRPBF
N	1	2	3
Package	SOT-23 Package Outline Drawing	SOT-23 Package Outline Drawing	SOT-23 Package Outline Drawing
Package Code	S6	S6	S6
Package Index	05-08-1636	05-08-1636	05-08-1636
Pin Count	6	6	6

Parametrics

Parameters / Models	LTC1872ES6#PBF	LTC1872ES6#TRMPBF	LTC1872ES6#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC328A	DC328A	DC328A
Design Tools	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no
Features	Burst Mode	Burst Mode	Burst Mode
Frequency, kHz	550	550	550
Integrated Inductor	no	no	no
Ishutdown, µA	8	8	8
Isupply, mA	0.27	0.27	0.27
Max Phases	1	1	1
Monolithic	no	no	no
Number of Outputs	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85
Polyphase	no	no	no
Sense Resistor	Rsense	Rsense	Rsense
Switch Current, A	10	10	10
Synchronous	no	no	no
Topology	Boost, Flyback, Sepic	Boost, Flyback, Sepic	Boost, Flyback, Sepic
Vin Max, V	9.8	9.8	9.8
Vin Min, V	2.5	2.5	2.5
Vin Min Startup, V	2.5	2.5	2.5
Vout Max, V	36	36	36
Vout Maximum	3, 5, 12 and higher	3, 5, 12 and higher	3, 5, 12 and higher
Vout Min, V	0.8	0.8	0.8
Vswitch Max, V	36	36	36

Eco Plan

	LTC1872ES6#PBF	LTC1872ES6#TRMPBF	LTC1872ES6#TRPBF
RoHS	Compliant	Compliant	Compliant

Design Notes

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Tiny Step-Up/Step-Down Power Supply Delivers 3.3V at 1.3A in Battery-Powered Devices &mdash DN271
PDF, 74 Kb, File published: Nov 1, 2001
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Tiny Step-Up/Step-Down Power Supply Delivers 3.3V at 1.3A in
Battery-Powered Devices вЂ“ Design Note 271
Keith Szolusha
Introduction
Many of todayвЂ™s cellular phones, PDAs, MP3 players and
other portable devices require that a consistent 3.3V
power supply be delivered from a single, rechargeable
lithium-ion battery. The problem is that a Li-Ion battery
at full charge has a voltage somewhat higher than 3.3V
and loses voltage over the life of a charge to less than
3.3V. A power supply that depends on a Li-Ion requires
a voltage regulator that can maintain consistent 3.3V
output from both high and low inputs. Since typical
Li-Ion applications are portable mass-market devices
where the focus is on short time-to-market, long battery
life, small size and low cost, the regulator must take
minimal space, be highly efп¬Ѓcient and use inexpensive
off-the-shelf components wherever possible. Regulated Output Voltage from a Range of Inputs
Although a SEPIC is only one of many possible conп¬Ѓgurations for a DC/DC converter, it has a major advantage
over other choices when applied in a modern portable
device. The SEPIC in Figure 1 delivers 3.3V output
throughout the input voltage range, 2.7V to 4.2V. One
alternative to the SEPIC conп¬Ѓguration is a simple stepdown converter. A step-down converter delivers 3.3V …

Model Line

Series: LTC1872 (3)

LTC1872ES6#PBF LTC1872ES6#TRMPBF LTC1872ES6#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > SEPIC Regulators
Power Management > Switching Regulator > Step-Up (Boost) Regulators > External Power Switch Boost