Datasheet Linear Technology LT3487

Manufacturer	Linear Technology
Series	LT3487

Boost and Inverting Switching Regulator for CCD Bias

Datasheets

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PDF, 296 Kb, Language: en, File uploaded: Sep 18, 2017, Pages: 16
Boost and Inverting Switching Regulator for CCD Bias

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Packaging

	LT3487EDD#PBF	LT3487EDD#TRPBF
N	1	2
Package	3x3 DFN-10 Package Outline Drawing	3x3 DFN-10 Package Outline Drawing
Package Code	DD	DD
Package Index	05-08-1699	05-08-1699
Pin Count	10	10

Parametrics

Parameters / Models	LT3487EDD#PBF	LT3487EDD#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC912A	DC912A
Design Tools	LTspice File	LTspice File
Export Control	no	no
Features	Output Disconnect, Sequencing, Integrated Schottky Diode	Output Disconnect, Sequencing, Integrated Schottky Diode
Frequency, kHz	2000	2000
Integrated Inductor	no	no
Ishutdown, µA	5.3	5.3
Isupply, mA	3.7	3.7
Monolithic	yes	yes
Number of Outputs	2	2
Operating Temperature Range, °C	0 to 85	0 to 85
Polyphase	no	no
Switch Current, A	1.09	1.09
Switch Current 2, A	0.92	0.92
Synchronous	no	no
Topology	Boost, Inverting	Boost, Inverting
Topology 1	Boost	Boost
Topology 2	Inverting	Inverting
Vin Max, V	16	16
Vin Min, V	2.3	2.3
Vin Min Startup, V	2.3	2.3
Vout Max, V	28	28
Vout Max 2, V	34	34
Vout Min, V	1.23	1.23
Vswitch Max, V	32	32

Eco Plan

	LT3487EDD#PBF	LT3487EDD#TRPBF
RoHS	Compliant	Compliant

Articles

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CCD Bias Supply Integrates 'њOutput Disconnect,'ќ Schottkys and Feedback Resistors &mdash LT Journal
PDF, 257 Kb, File published: Nov 22, 2006
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DESIGN FEATURESвЂ‰L CCD Bias Supply Integrates
вЂњOutput Disconnect,вЂќ Schottkys
by Jesus Rosales
and Feedback Resistors
Introduction CCD Draws High Power
from Discharged Li-Ion FigureВ 1 shows the LT3487 in a high
power CCD application that provides
45mA at 15V and 90mA at вЂ“8V from
a nearly discharged Li-Ion battery at
3.0V. This power handling allows the
LT3487 to be used in digital cameras
with video capability.
This particular converter operates
over a wide input voltage range between 2.3V and 16V. Both channels
run at a 2MHz switching frequency,
enabling the use of tiny inductors and
capacitors. The fixed frequency PWM
control provides outputs with low,
predictable ripple.
External components are minimized as both channels incorporate
on-chip Schottky diodes. Each channel
also requires only one external resistor
to set the output voltage. The second …
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J-FET-Based DC/DC Converter Starts and Runs from 300mV Supply &mdash LT Journal
PDF, 475 Kb, File published: Nov 22, 2006
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LвЂ‰DESIGN IDEAS J-FET-Based DC/DC Converter Starts
and Runs from 300mV Supply by Jim Williams
A J-FETвЂ™s self-biasing characteristic
can be utilized to construct a DC/DC
converter powered from as little as
300mV. Solar cells, thermopiles and
single stage fuel cells, all with outputs below 600mV, are typical power
sources for such a converter.
Figure 1, an N-channel J-FET I-V
plot, shows drain-source conduction
under zero bias (gate and source tied
together) conditions. This property can
be exploited to produce a self-starting
DC/DC converter that runs from 0.3V
to 1.6V inputs.
Figure 2 shows the circuit. Q1 and
T1 form an oscillator with T1вЂ™s secondary providing regenerative feedback
to Q1вЂ™s gate. When power is applied,
Q1вЂ™s gate is at zero volts and its drain
conducts current via T1вЂ™s primary. T1вЂ™s
phase inverting secondary responds by
going negative at Q1вЂ™s gate, turning
it off. T1вЂ™s primary current ceases, …

Model Line

Series: LT3487 (2)

LT3487EDD#PBF LT3487EDD#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Inverting Regulators | LCD/CCD/OLED Bias
Power Management > Switching Regulator > Step-Up (Boost) Regulators > Internal Power Switch Boost