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LT1941EFE#TRPBF

Description
IC REG MULT CONFIG INV 28TSSOP
CategoryPower/power management    The power supply circuit   
File Size223KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LT1941EFE#TRPBF Overview

IC REG MULT CONFIG INV 28TSSOP

LT1941EFE#TRPBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
Parts packaging codeTSSOP
package instructionHTSSOP, TSSOP28,.25
Contacts28
Manufacturer packaging codeFE
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyCONSTANT OFF TIME
Maximum input voltage25 V
Minimum input voltage3.5 V
Nominal input voltage5 V
JESD-30 codeR-PDSO-G28
JESD-609 codee3
length9.7 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current6 A
Package body materialPLASTIC/EPOXY
encapsulated codeHTSSOP
Encapsulate equivalent codeTSSOP28,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)250
Certification statusNot Qualified
Maximum seat height1.2 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency1350 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width4.4 mm
Base Number Matches1
LT1941
Triple Monolithic
Switching Regulator
FEATURES
n
n
DESCRIPTION
The LT
®
1941 is a triple current mode DC/DC converter
with internal power switches. Two of the regulators are
step-down converters with 3A and 2A power switches.
The third regulator can be configured as a boost, inverter
or SEPIC converter and has a 1.5A power switch. All
three converters are synchronized to a 1.1MHz oscillator.
The two step-down converters run with opposite phase,
reducing input ripple current. The output voltages are
set with external resistor dividers and each regulator
has independent shutdown and soft-start circuits. Each
regulator generates a power good signal when its output
is in regulation, easing power supply sequencing and
interfacing with microcontrollers and DSPs.
The high switching frequency offers several advantages
by permitting the use of small inductors and ceramic
capacitors, leading to a very small triple output solution.
The constant switching frequency, combined with low
impedance ceramic capacitors, result in low, predictable
output ripple. With its wide input voltage range of 3.5V to
25V, the LT1941 regulates a broad array of power sources
from 4-cell batteries and 5V logic rails to unregulated wall
transformers, lead acid batteries and distributed-power
supplies.
n
n
n
n
n
n
n
Wide Input Range: 3.5V to 25V
Three Switching Regulators with Internal Power
Switches: 3A Step-Down, 2A Step-Down,
1.5A Inverting/Boost
Antiphase Switching Reduces Ripple
Independent Shutdown/Soft-Start Pins
Independent Power Good Indicators Ease Supply
Sequencing
Input Voltage Power Good Indicators Monitor Input
Supply
Uses Small Inductors and Ceramic Capacitors
Constant 1.1MHz Switching Frequency
Thermally Enhanced 28-Lead TSSOP Package
APPLICATIONS
n
n
n
n
n
n
Cable Modems
DSL Modems
Distributed Power Regulation
Wall Transformer Regulation
Disk Drives
DSP Power
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
V
IN
4.7V TO 14V
130k
100k
V
IN
PGOOD1
5GOOD
BOOST1
V
OUT1
1.8V
2.4A
3μH
13.7k
3300pF
33μF
7.32k
3.3k
1.5nF
0.22μF
SW1
FB1
V
C1
PGOOD2
BOOST2
0.22μF
SW2
FB2
V
C2
1000pF
10k
RUNSS1 RUNSS2
SW3
22μH
V
OUT3
–12V
350mA*
10μF
1μF
22μH
10μF
*240mA AT V
IN
= 5V, 550mA AT V
IN
= 12V
133k
13.7k
FB3
NFB
BIAS1
BIAS2
V
C3
RUNSS3
GND
1.5nF
1.5k
1941 F01
V
OUT1
100k
V
OUT2
100k
100k
PGOOD1
PGOOD2
PGOOD3
3.3μH
V
OUT2
3.3V
1.4A
22μF
5GOOD
12GOOD
12GOOD PGOOD3
LT1941
Start-Up Waveforms
with Sequencing
RUN/SS
2V/DIV
V
OUT1
2V/DIV
V
OUT2
5V/DIV
V
OUT3
10V/DIV
I
VIN(AVE)
1A/DIV
PGOOD2
5V/DIV
2ms/DIV
1941 F01b
10.7k
2.49k
1.5nF
22nF
Figure 1. Triple Output Power Supply: 3.3V, 1.8V, –12V
1941fb
1

LT1941EFE#TRPBF Related Products

LT1941EFE#TRPBF LT1941EFE#TR LT1941EFE#PBF
Description IC REG MULT CONFIG INV 28TSSOP IC reg multi config trpl 28tssop IC REG MULT CONFIG INV 28TSSOP
Brand Name Linear Technology Linear Technology Linear Technology
Is it Rohs certified? conform to incompatible conform to
Parts packaging code TSSOP TSSOP TSSOP
package instruction HTSSOP, TSSOP28,.25 HTSSOP, TSSOP28,.25 HTSSOP, TSSOP28,.25
Contacts 28 28 28
Manufacturer packaging code FE FE FE
Reach Compliance Code compliant _compli compliant
ECCN code EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology CONSTANT OFF TIME CONSTANT OFF TIME CONSTANT OFF TIME
Maximum input voltage 25 V 25 V 25 V
Minimum input voltage 3.5 V 3.5 V 3.5 V
Nominal input voltage 5 V 5 V 5 V
JESD-30 code R-PDSO-G28 R-PDSO-G28 R-PDSO-G28
JESD-609 code e3 e0 e3
length 9.7 mm 9.7 mm 9.7 mm
Humidity sensitivity level 1 1 1
Number of functions 1 1 1
Number of terminals 28 28 28
Maximum operating temperature 70 °C 70 °C 70 °C
Maximum output current 6 A 6 A 6 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code HTSSOP HTSSOP HTSSOP
Encapsulate equivalent code TSSOP28,.25 TSSOP28,.25 TSSOP28,.25
Package shape RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 250 235 260
Certification status Not Qualified Not Qualified Not Qualified
Maximum seat height 1.2 mm 1.2 mm 1.2 mm
surface mount YES YES YES
Switch configuration BUCK BUCK BUCK
Maximum switching frequency 1350 kHz 1350 kHz 1350 kHz
Temperature level COMMERCIAL COMMERCIAL COMMERCIAL
Terminal surface Matte Tin (Sn) Tin/Lead (Sn/Pb) Matte Tin (Sn)
Terminal form GULL WING GULL WING GULL WING
Terminal pitch 0.65 mm 0.65 mm 0.65 mm
Terminal location DUAL DUAL DUAL
Maximum time at peak reflow temperature NOT SPECIFIED 20 30
width 4.4 mm 4.4 mm 4.4 mm
Base Number Matches 1 1 1
technology BIPOLAR BIPOLAR -
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